Lennox EL195UHNEK Gas Furnace Installation Instructions

installation guide for LENNOX models including: EL195UHNEK, EL195UHNEK Gas Furnace, EL195UHNEK, Gas Furnace, Furnace

[PDF] INSTALLATION INSTRUCTIONS EL195UHNEK - Lennox

In Canada, all electrical wiring and grounding for the unit must be installed according to the current regulations of the Canadian Electrical Code Part I (CSA ...

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508575-01a

INSTALLATION INSTRUCTIONS EL195UHNEK
ELITE® SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE

508575-01 07/2025

THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death.

WARNING
This furnace is equipped with an ignition control factory enabled for use with Lennox A2L refrigerant systems. Disabling the refrigerant detection functionality on A2L system is prohibited by safety codes. Refer to furnace installation instructions for non-A2L and non-Lennox refrigerant system setup.

IMPORTANT
DO NOT use the heat exchanger tubes to lift, drag or pull the furnace to its installation location. Doing so will damage the tubes causing noise and or unsafe operation.
Heatexchanger Tubes

Contents
Unit Dimensions - inches (mm) ......................................2 EL195UHNEK Gas Furnace...........................................3 Shipping and Packing List .............................................. 3 Safety Information ..........................................................3 Use of Furnace as Construction Heater ......................... 4 General ........................................................................... 4 Combustion, Dilution & Ventilation Air ............................ 5 Shipping Bolt Removal ................................................... 8 Installation - Setting Equipment......................................8 Filters ............................................................................ 13 Duct System .................................................................13 Pipe Fittings Specifications...........................................14 Joint Cementing Procedure ..........................................16 Venting Practices..........................................................16

Vent Piping Guidelines .................................................17 Gas Piping ....................................................................36 Electrical .......................................................................39 Ignition Control .............................................................41 Twinning .......................................................................46 Low GWP Application ...................................................47 Unit Start-Up.................................................................50 Gas Pressure Adjustment.............................................52 Proper Combustion.......................................................52 High Altitude Information ..............................................52 Testing for Venting and Combustion Air........................53 Service.......................................................................... 55 Repair Parts List ...........................................................56 Start-Up & Performance Check List .............................57
Blower Data ................................................................. 59

Page 1

EL195UHNEK Unit Dimensions - inches (mm)

1 NOTE - 60C size units that require air volumes over 1800 cfm must have one of the following: 1. Single side return air and Optional Return Air Base with transition that must accommodate required 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to maintain proper velocity. 2. Bottom return air. 3. Return air from both sides. 4. Bottom and one side return air. See Blower Performance Tables for additional information.
2 Optional Side Return Air Filter Kit is not for use with the Optional Return Air Base.

3-1/4 (83) 1-7/8 (48)
COMBUSTION AIR INTAKE
2 OPTIONAL SIDE RETURN AIR FILTER KIT
(Either Side)

EXHAUST AIR OUTLET
SUPPLY AIR OPENING
23-3/4 (603)
25 (635)
TOP VIEW

9/16 (14)

1-1/2 (38) Front Panel

2 OPTIONAL SIDE RETURN AIR FILTER KIT
(Either Side) 33
(838)
14-3/4 (375)
16 (406)

2-7/8 6-5/8 (73) (168)
12-5/8 (321)
Not Used
ELECTRICAL INLET
(Either Side)

AIR FLOW

5/8

3/4 (19)

3/4 (16) (19)

1 Bottom Return

Air Opening

FRONT VIEW

3-1/4 (83)

2-1/4 (57)

27-3/4 (705)
19-7/16 (494)

INTAKE AIR

GAS PIPING INLET (Right Side Only)
CONDENSATE TRAP CONNECTION (Either Side) 6-1/2 (165) (Either Side)

23 (584)
1 Side Return Air Opening (Either Side)

14 (356)

1-15/16 (49)
23-1/2 (597) 1 Bottom Return Air Opening
SIDE VIEW

9/16 (14)
1-1/2 (38)

Model
EL195UH040NE36BK EL195UH060NE36BK EL195UH080NE48CK EL195UH100NE60CK

A in (mm)

17-1/2

(446)

(553)

B in (mm)

16-3/8

(416)

19-7/8

(505)

Page 2

C in (mm)

(406)

19-1/2

(495)

EL195UHNEK Gas Furnace
The EL195UHNEK Category IV gas furnace is shipped ready for installation in the upflow or horizontal position. The furnace is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed in horizontal or upflow applications with bottom return air.
The EL195UHNEK can be installed as either a Direct Vent or a Non-Direct Vent gas central furnace. The furnace is equipped for installation in natural gas applications.
NOTE - In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors. In Non-Direct Vent installations, combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged outdoors. See FIGURE 1 and FIGURE 2 for applications involving roof termination.

DIRECT VENT INSTALLATION
EXHAUST OUTLET COMBUSTION
AIR INTAKE OUTSIDE OF HOUSE

NON-DIRECT VENT INSTALLATION
EXHAUST OUTLET

Shipping and Packing List Package 1 of 1 contains
1 - Assembled EL195UHNEK unit 1 - Bag assembly containing the following:
1 - Snap bushing 1 - 1/2" diameter threaded street elbow 1 - Snap plug 1 - Wire tie 1 - Condensate trap 1 - Condensate trap cap 1 - Condensate trap clamp 1 - 2" diameter debris screen 1 - 3/4" Threaded street elbow Check equipment for shipping damage. If you find any damage, immediately contact the last carrier. The following items may also be ordered separately: 1 - Thermostat 1 - Return air base kit 1 - Horizontal suspension kit 1 - Sensor Kit (field installed)

COMBUSTION AIR INTAKE INSIDE OF HOUSE

FIGURE 1

NON-DIRECT VENT INSTALLATION
EXHAUST OUTLET

Safety Information
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.

COMBUSTION AIR INTAKE INSIDE
VENTILATED ATTIC SPACE
FIGURE 2

COMBUSTION AIR INTAKE INSIDE
VENTILATED CRAWL SPACE

DANGER
Danger of explosion.
There are circumstances in which odorant used with LP/ propane gas can lose its scent. In case of a leak, LP/ propane gas will settle close to the floor and may be difficult to smell. An LP/propane leak detector should be installed in all LP applications.
Use only the type of gas approved for use with this furnace. Refer to unit nameplate. EL195UHNEK units are CSA International certified to ANSI Z21.47 and CSA 2.3 standards.
Building Codes
In the USA, installation of gas furnaces must conform with local building codes. In the absence of local codes, units must be installed according to the current National Fuel Gas Code (ANSI-Z223.1/NFPA 54). The National Fuel

Page 3

Gas Code is available from the following address:
American National Standards Institute, Inc.
11 West 42nd Street
New York, NY 10036
In Canada, installation must conform with current National Standard of Canada CSA-B149 Natural Gas and Propane Installation Codes, local plumbing or waste water codes and other applicable local codes.In order to ensure proper unit operation in non-direct vent applications, combustion and ventilation air supply must be provided according to the current National Fuel Gas Code or CSA-B149 standard.
Installation Locations
This furnace is CSA International certified for installation clearances to combustible material as listed on the unit nameplate and in the table in FIGURE 12. Accessibility and service clearances must take precedence over fire protection clearances. NOTE - For installation on combustible floors, the furnace shall not be installed directly on carpeting, tile, or other combustible material other than wood flooring.
For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the floor. The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a hazardous atmosphere, the furnace must be installed according to recommended good practice requirements and current National Fuel Gas Code or CSA B149 standards. NOTE - Furnace must be adjusted to obtain a temperature rise within the range specified on the unit nameplate. Failure to do so may cause erratic limit operation and premature heat exchanger failure.
This EL195UHNEK furnace must be installed so that its electrical components are protected from water.
Installed in Combination with a Cooling Coil
NOTE - If a non-Lennox coil is used, consult the coil's literature for the recommended distance from the top of the furnace cabinet/heat exchanger.
When this furnace is used with cooling coils FIGURE 3, it shall be installed in parallel with, or on the upstream side of, cooling coils to avoid condensation in the heating compartment. With a parallel flow arrangement, a damper (or other means to control the flow of air) must adequately prevent chilled air from entering the furnace. If the damper is manually operated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full HEAT or COOL setting.
When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Electric Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/NFPA No. 70) is available from the following address:
National Fire Protection Association
1 Battery March Park
Quincy, MA 02269
In Canada, all electrical wiring and grounding for the unit must be installed according to the current regulations of the Canadian Electrical Code Part I (CSA Standard C22.1)

and/or

local

codes.

Heating Unit Installed Parallel to Air Handler Unit
Dampers (open during heating operation only)

Gas Unit

AIR FLOW

Air Handler Unit

AIR FLOW

Dampers (open during cooling operation only)

Heating Unit Installed Upstream of Cooling Coil

AIR FLOW

Gas Unit

AIR FLOW

Cooling Coil
FIGURE 3 NOTE - This furnace is designed for a minimum continuous return air temperature of 60°F (16°C) or an intermittent operation down to 55°F (13°C) dry bulb for cases where a night setback thermostat is used. Return air temperature must not exceed 85°F (29°C) dry bulb. The EL195UHNEK furnace may be installed in alcoves, closets, attics, basements, garages, crawl spaces and utility rooms in the upflow or horizontal position. This furnace design has not been CSA certified for installation in mobile homes, recreational vehicles, or outdoors.
Use of Furnace as Construction Heater
Lennox does not recommend the use of EL195UHNEK units as a construction heater during any phase of construction. Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit.
EL195UHNEK units may be used for heating of buildings or structures under construction, if the following conditions are met:
· The vent system must be permanently installed per these installation instructions.
· A room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed.
· The return air duct must be provided and sealed to the furnace.
· Return air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained.
· Air filters must be installed in the system and must be maintained during construction.
· Air filters must be replaced upon construction com-

Page 4

pletion.
· The input rate and temperature rise must be set per the furnace rating plate.
· One hundred percent (100%) outdoor air must be provided for combustion air requirements during construction. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace. Size the temporary duct following these instructions in section for Combustion, Dilution and Ventilation Air in a confined space with air from outside.
· The furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction clean-up. All furnace operating conditions (including ignition, input rate, temperature rise and venting) must be verified according to these installation instructions.
· The refrigerant leak detection sensor must be inspected for dust/debris deposits. Please refer to the evaporator coil and/or refrigerant detection sensor kit instructions for additional information.
General
These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.
In addition to the requirements outlined previously, the following general recommendations must be considered when installing a EL195UHNEK furnace:
· Place the furnace as close to the center of the air distribution system as possible. The furnace should also be located close to the vent termination point.
· When the furnace is installed in non-direct vent applications, do not install the furnace where drafts might blow directly into it. This could cause improper combustion and unsafe operation.
· When the furnace is installed in non-direct vent applications, do not block the furnace combustion air opening with clothing, boxes, doors, etc. Air is needed for proper combustion and safe unit operation.
· When the furnace is installed in an attic or other insulated space, keep insulation away from the furnace.
· When the furnace is installed in an unconditioned space, consider provisions required to prevent freezing of condensate drain system.
· Please consult the manufacturer of your evaporator coil for their recommendations on distance required between the heat exchanger and their drain pan. Adequate space must be provided between the drain pan and the furnace heat exchanger.
CAUTION
EL195UHNEK unit should not be installed in areas normally subject to freezing temperatures.

WARNING
Insufficient combustion air can cause headaches, nausea, dizziness or asphyxiation. It will also cause excess water in the heat exchanger resulting in rusting and premature heat exchanger failure. Excessive exposure to contaminated combustion air will result in safety and performance related problems. Avoid exposure to the following substances in the combustion air supply:
Permanent wave solutions Chlorinated waxes and cleaners Chlorine base swimming pool chemicals Water softening chemicals De-icing salts or chemicals Carbon tetrachloride Halogen type refrigerants Cleaning solvents (such as perchloroethylene) Printing inks, paint removers, varnishes, etc. Hydrochloric acid Cements and glues Antistatic fabric softeners for clothes dryers Masonry acid washing materials
Combustion, Dilution & Ventilation Air
If the EL195UHNEK is installed as a Non-Direct Vent Furnace, follow the guidelines in this section.
NOTE - In Non-Direct Vent installations, combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged out-doors.
In the past, there was no problem in bringing in sufficient outdoor air for combustion. Infiltration provided all the air that was needed. In today's homes, tight construction practices make it necessary to bring in air from outside for combustion. Take into account that exhaust fans, appliance vents, chimneys, and fireplaces force additional air that could be used for combustion out of the house.
Unless outside air is brought into the house for combustion, negative pressure (outside pressure is greater than inside pressure) will build to the point that a downdraft can occur in the furnace vent pipe or chimney. As a result, combustion gases enter the living space creating a potentially dangerous situation.
In the absence of local codes concerning air for combustion and ventilation, use the guidelines and procedures in this section to install EL195UHNEK furnaces to ensure efficient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas piping. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSIZ223.1/NFPA 54). This reprinted material is not the complete and official position of the ANSI on the referenced subject, which is represented only by the standard in its entirety.
In Canada, refer to the CSA B149 installation codes.

Page 5

CAUTION
Do not install the furnace in a corrosive or contaminated atmosphere. Meet all combustion and ventilation air requirements, as well as all local codes.
All gas-fired appliances require air for the combustion process. If sufficient combustion air is not available, the furnace or other appliance will operate inefficiently and unsafely. Enough air must be provided to meet the needs of all fuel-burning appliances and appliances such as exhaust fans which force air out of the house. When fireplaces, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is required to ensure proper combustion and to prevent a downdraft. Insufficient air causes incomplete combustion which can result in carbon monoxide.
In addition to providing combustion air, fresh outdoor air dilutes contaminants in the indoor air. These contaminants may include bleaches, adhesives, detergents, solvents and other contaminants which can corrode furnace components.
The requirements for providing air for combustion and ventilation depend largely on whether the furnace is installed in an unconfined or a confined space.
Unconfined Space
An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not separated by a door. Though an area may appear to be unconfined, it might be necessary to bring in outdoor air for combustion if the structure does not provide enough air by infiltration. If the furnace is located in a building of tight construction with weather stripping and caulking around the windows and doors, follow the procedures in the Air from Outside section.
Confined Space
A confined space is an area with a volume less than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that space. This definition includes furnace closets or small equipment rooms.
When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room.

Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure condition. Air for combustion and ventilation can be brought into the confined space either from inside the building or from outside .Air from Inside
If the confined space that houses the furnace adjoins a space categorized as unconfined, air can be brought in by providing two permanent openings between the two spaces. Each opening must have a minimum free area of 1 square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of total input rating of all gas-fired equipment in the confined space. Each opening must be at least 100 square inches (64516 mm2). One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. See FIGURE 4.
EQUIPMENT IN CONFINED SPACE - ALL AIR FROM INSIDE
ROOF TERMINATED EXHAUST PIPE

SIDE WALL TERMINATED EXHAUST PIPE (ALTERNATE LOCATION)

OPENINGS (To Adjacent Unconfined
Space)

NOTE - Each opening shall have a free area of at least one square inch per 1,000 Btu (645mm2 per .29kW) per hour of the total input rating of
all equipment in the enclosure, but not less than 100 square inches (64516mm.2).

Air from Outside

FIGURE 4

If air from outside is brought in for combustion and ventilation, the confined space shall be provided with two permanent openings. One opening shall be within 12" (305mm) of the top of the enclosure and one within 12" (305mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of total input rating of all equipment in the enclosure. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 Btu (645mm2 per .59kW) per total input rating of all equipment in the enclosure (See FIGURE 5).It is also permissible to bring in air for combustion from a ventilated attic (FIGURE 6) or ventilated crawl space (FIGURE 7).

Page 6

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE (Inlet Air from Crawl Space and Outlet Air to Outside)

ROOF TERMINATED EXHAUST PIPE

VENTILATION LOUVERS (Each end of attic)

EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside)
Roof Terminated Exhaust Pipe

SIDE WALL TERMINATED EXHAUST PIPE (ALTERNATE LOCATION)

OUTLET AIR
FURNACE
INLET AIR

VENTILATION LOUVERS
(For unheated crawl space)

Ventilation

Louvers

Furnace

(Crawl space)

Inlet Air (Minimum 12 in.(305mm) Above crawl space floor)

EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Attic and Outlet Air to Outside)

Roof Terminated Exhaust Pipe

Ventilation Louvers
Inlet Air (Minimum 12 in.(305mm) Above attic floor)

*Intake Debris Screen
(Provided)
Furnace

Coupling or 3 in. to 2 in. Transition (Field Provided)

*Intake Debris Screen Provided)

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of the total input rating of all equipment in the enclosure.
FIGURE 7
If air from outside is brought in for combustion and ventilation, the confined space must have two permanent openings. One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of total input rating of all equipment in the enclosure. See FIGURE 5 and FIGURE 8. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch (645 mm2) per 2,000 Btu (.56 kW) per total input rating of all equipment in the enclosure. See FIGURE 9.
When ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. If the design and free area of protective covering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 percent free area and metal louvers and grilles will have 60 to 75 percent free area. Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they.

Page 7

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE (All Air Through Ventilated Attic)

ROOF TERMINATED EXHAUST PIPE

OUTLET AIR

VENTILATION LOUVERS (Each end of attic)

SIDE WALL TERMINATED EXHAUST PIPE (ALTERNATE LOCATION)

FURNACE

INLET AIR (Ends 12" above
bottom)

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of the total input rating of all equipment in the enclosure.

FIGURE 8
EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE

ROOF TERMINATED EXHAUST PIPE

Flexible mounting leg). See FIGURE 10. The bolt and washer must be removed before the furnace is placed into operation. After the bolt and washer have been removed, the rigid leg will not touch the blower housing.
Units with 1/2 or 3/4 HP Blower Motor
RIGID LEG remove shipping bolt and washe
FIGURE 10 Installation - Setting Equipment
WARNING
Do not connect the return air duct to the back of the furnace. Doing so will adversely affect the operation of the safety control devices, which could result in personal injury or death.

OUTLET AIR

SIDE WALL TERMINATED EXHAUST PIPE (ALTERNATE LOCATION)

FURNACE

INLET AIR

NOTE-Each air duct opening shall have a free area of at least one square inch per 2,000 Btu (645mm2 per .59kW) per hour of the total input rating of all equipment in the enclosure. If the equipment room
cate directly with the outdoors, each opening shall have a free area of at least 1 square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of the total input rating of all other equipment in the enclosure.
FIGURE 9
Shipping Bolt Removal Units with 1/2 and 3/4 hp blower motor are equipped with three flexible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet used with a

WARNING
Blower access panel must be securely in place when blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.
Upflow Applications The EL195UHNEK gas furnace can be installed as shipped in the upflow position. Refer to FIGURE 12 for clearances. Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, condensate trap and drain connections, and installation and service clearances [24 inches (610 mm) at unit front]. The unit must be level from side to side. The unit may be positioned from level to ½" toward the front. See FIGURE 11. Allow for clearances to combustible materials as indicated on the unit nameplate.

Page 8

SETTING EQUIPMENT UPFLOW APPLICATION

Place level on the front blower deck to check side to side

Place level on blower deck screws to check
forward tilt
UNIT FRONT
HORIZONTAL APPLICATION

AIR FLOW
SIDE VIEW

1/2" max.

UNIT FRONT

AIR FLOW

1/2" max.

FRONT VIEW

END VIEW

Unit must be level side-to-side. Unit may be positioned from level to 1/2" toward the front to aid in draining.

FIGURE 11

Page 9

WARNING
Improper installation of the furnace can result in personal injury or death. Combustion and flue products must never be allowed to enter the return air system or air in the living space. Use sheet metal screws and joint tape to seal return air system to furnace.
In platform installations with furnace return, the furnace should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the furnace. Allow absolutely no sagging, cracks, gaps, etc. For no reason should return and supply air duct systems ever be connected to or from other heating devices such as a fireplace or stove, etc. Fire, explosion, carbon monoxide poisoning, personal injury and/or property damage could result.
Installation Clearances
Top

Left Side

Right Side

Return Air Guidelines Return air can be brought in through the bottom or either side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely. The furnace is equipped with a removable bottom panel to facilitate installation. Markings are provided on both sides of the furnace cabinet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on page 2.
Refer to Engineering Handbook for additional information.
EL195UHNEK applications which include side return air and a condensate trap installed on the same side of the cabinet (trap can be installed remotely within 5 ft.) require either a return air base or field-fabricated transition to accommodate an optional IAQ accessory taller than 14.5". See FIGURE 13.
Side Return Air (with transition and filter)
20" X 25" X 1" (508mmX635mmX 25mm)
Air Filter

Bottom (Floor)

Top/Plenum

1 in. (25 mm)

*Front

Back

Sides

Vent

Floor

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. Allow proper clearances to accommodate condensate trap. For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

FIGURE 12

Return Air
Plenum
Transition FIGURE 13

Page 10

CONDENSATE TRAP

Optional Return Air Base (Upflow Applications Only)
FURNACE FRONT

AIR FLOW

INDOOR AIR QUALITY CABINET
(PCO, Filter Cabinet, etc.)

IF BASE IS USED WITHOUT IAQ CABINET, A SINGLE RETURN AIR PLENUM
MUST COVER BOTH
UNIT AND RETURN AIR BASE OPENINGS

3-1/4 (83)
7-1/4 (184)

1 23 (584) Overall
(Maximum)
1 Unit side return air Opening

1 Minimum 11 (279)
2 Maximum
14 (356)

5-5/8 (143)

SIDE RETURN AIR OPENINGS

(Either Side)

1 22-7/16 (570) Overall
(Maximum)

17-1/2 (446) B Width (50W98) 21 (533) C Width (50W99) 24-1/2 (622) D Width (51W00)
FRONT VIEW

OPTIONAL RETURN AIR BASE

(584)

3/4

26-7/8

(19)

(683)

SIDE VIEW

NOTE- Optional side return air filter kits are not for use with return air base. 1 Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.
Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air
opening. The size of the opening must not extend beyond the markings on the furnace cabinet. 2 To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.

FIGURE 14

Removing the Bottom Panel

Removing the Bottom Panel
Remove the two screws that secure the bottom cap to the furnace. Pivot the bottom cap down to release the bottom panel. Once the bottom panel has been removed, reinstall the bottom cap. See FIGURE 15.
Horizontal Applications
WARNING
Do not install the furnace on its front or back. See FIGURE 16.

See figure 4.

Screw

Bottom Cap Bottom Panel
FIGURE 15

Front

Back

FIGURE 16

Page 11

The EL195UHNEK furnace can be installed in horizontal applications with either right- or left-hand air discharge. Refer to FIGURE 17 for clearances in horizontal applications
.

Horizontal Application Installation Clearances

Right-Hand Discharge

Left End

Right End

Air Flow

Bottom (Floor)**

Air Flow

Left End

Left-Hand Discharge Top

Right End

Air Flow

Bottom (Floor)**

Air Flow

Top

Front*

Back

Ends

Vent

Floor

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. **An 8" service clearance must be maintained below the unit to provide for servicing of the condensate trap. For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

FIGURE 17
Suspended Installation of Horizontal Unit
This furnace may be installed in either an attic or a crawlspace. Either suspend the furnace from roof rafters or floor joists, as shown in FIGURE 18, or install the furnace on a platform, as shown in FIGURE 19. A horizontal suspension kit (51W10) may be ordered from Lennox or use equivalent. NOTE - Heavy-gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists. Straps are used to suspend the unit in this way, support must be provided for both the ends. The straps must not interfere with the plenum or exhaust piping installation. Cooling coils and supply and return air plenums must be supported separately.

HORIZONTAL SUSPENSION KIT

Metal Strap (typical)

Internal Brace (provided with kit)

Bracket (typical)

Air Flow

FIGURE 18 NOTE - When the furnace is installed on a platform or with the horizontal suspension kit in a crawlspace, it must be elevated enough to avoid water damage, accommodate drain trap and to allow the evaporator coil to drain.
Platform Installation of Horizontal Unit
1 - Select location for unit keeping in mind service and other necessary clearances. See FIGURE 17.
2 - Construct a raised wooden frame and cover frame with a plywood sheet. If unit is installed above finished space, fabricate an auxiliary drain pan to be installed under unit. Set unit in drain pan as shown in FIGURE 19. Leave 8 inches for service clearance below unit for condensate trap.
3 - Provide a service platform in front of unit. When installing the unit in a crawl space, a proper support platform may be created using cement blocks.
4 - Route auxiliary drain line so that water draining from this outlet will be easily noticed by the homeowner.
5 - If necessary, run the condensate line into a condensate pump to meet drain line slope requirements. The pump must be rated for use with condensing furnaces. Protect the condensate discharge line from the pump to the outside to avoid freezing.
6 - Continue with exhaust, condensate and intake piping installation according to instructions.

Page 12

INTAKE PIPE EXHAUST PIPE
*Gas connector may be used for Canadian able by local authority having jurisdiction.

*GAS CONNECTION

SERVICE PLATFORM

RAISED PLATFORM

FIGURE 19
Return Air -- Horizontal Applications
Return air may be brought in only through the end of a furnace installed in the horizontal position. The furnace is equipped with a removable bottom panel to facilitate installation. See FIGURE 15.

Filters
This unit is not equipped with a filter or rack. A field-provided high velocity rated filter is required for the unit to operate properly. TABLE 1 lists recommended filter sizes. A filter must be in place whenever the unit is operating.
IMPORTANT
If a high-efficiency filter is being installed as part of this system to ensure better indoor air quality, the filter must be properly sized. High-efficiency filters have a higher static pressure drop than standard efficiency glass/foam filters. If the pressure drop is too great, system capacity and performance may be reduced The pressure drop may also cause the limit to trip more frequently during the winter and the indoor coil to freeze in the summer, resulting in an increase in the number of service calls.
Before using any filter with this system, check the specifications provided by the filter manufacturer against the data given in the appropriate Lennox Product Specifications bulletin. Additional information is provided in Service and Application Note ACC002 (August 2000).

Furnace Cabinet Width
17-1/2" 21"

TABLE 1

Filter Size

Side Return

Bottom Return

16 X 25 X 1 (1)

20 X 25 X 1 (1)

Duct System
Use industry-approved standards to size and install the supply and return air duct system. FIGURE 20 shows the correct supply and return duct installation. Refer to ACCA Manual D. This will result in a quiet and low-static system that has uniform air distribution. NOTE - This furnace is not certified for operation in heating mode (indoor blower operating at selected heating speed) with an external static pressure which exceeds 0.5 inches w.c. Operation at these conditions may result in improper limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a removable access panel should be installed in the supply air duct. The access panel should be large enough to permit inspection of the heat exchanger. The furnace access panel must always be in place when the furnace is operating and it must not allow leaks. For horizontal units, install self tapping screws in the three evaporator coil screw holes made for horizontal applications to seal the top cap to the vestibule panel.
Return Air Plenum
NOTE - Return air must not be drawn from a room where this furnace, or any other gas-fueled appliance (i.e., water heater), or carbon monoxide-producing device (i.e., wood fireplace) is installed.
When return air is drawn from a room, a negative pressure is created in the room. If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas. This raw gas or toxic fumes might then be distributed throughout the house by the furnace duct system.
Return air can be brought in through the bottom or either side of the furnace (return air brought into either side of furnace allowed in upflow applications only). If a furnace with bottom return air is installed on a platform, make an airtight seal between the bottom of the furnace and the platform to ensure that the unit operates properly and safely. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is installed, size the return air duct to fit the filter frame.

Page 13

SUPPLY AIR

Install self tapping screws to seal any potential air leaks
SUPPLY AIR

UPFLOW UNIT

HORIZONTAL UNIT

FIGURE 20

Pipe & Fittings Specifications
All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) standards. The solvent shall be free flowing and contain no lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratification, or separation that cannot be removed by stirring. Refer TABLE 2 for approved piping and fitting materials.
CAUTION
Solvent cements for plastic pipe are flammable liquids and should be kept away from all sources of ignition.
Do not use excessive amounts of solvent cement when
making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors. Avoid contact of cement with skin and eyes.

IMPORTANT
EL195UHNEK exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fittings in the unit.

TABLE 2

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe)

D1785

Schedule 40 PVC (Fittings)

D2466

Schedule 40 CPVC (Pipe)

F441

Schedule 40 CPVC (Fittings)

F438

SDR-21 PVC or SDR-26 PVC (Pipe)

D2241

SDR-21 CPVC or SDR-26 CPVC (Pipe)

F442

Schedule 40 ABS (Pipe)

D1527

TABLE 2 Continued

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 ABS (Fittings)

D2468

ABS-DWV (Drain Waste & Vent) (Pipe & Fittings)

D2661

PVC-DWV (Drain Waste & Vent) Pipe & Fittings)

D2665

PRIMER & SOLVENT CEMENT

ASTM SPECIFICATION

PVC & CPVC Primer

F656

PVC Solvent Cement

D2564

CPVC Solvent Cement

F493

ABS Solvent Cement

D2235

PVC/CPVC/ABS All Purpose Cement For Fittings & Pipe of the same material

D2564, D2235, F493

ABS to PVC or CPVC Transition Solvent Cement
PVC & ABS & NORYL Transition Solvent Cement WELD-ON 4052

D3138

CANADA PIPE & FITTING & SOLVENT CEMENT

MARKING

PVC & CPVC Pipe and Fittings

PVC & CPVC Solvent Cement

ABS to PVC or CPVC Transition Cement POLYPROPYLENE VENTING SYSTEM

ULCS636

PolyPro® by Duravent

InnoFlue® by Centrotherm

UL 1738 CERTIFIED GAS VENTING SYSTEM

IPEX System1738 Schedule 40 PVC Pipes and Fittings
IPEX System1738 PVC FGV Cement & Primer

UL1738

Page 14

Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to TABLE 2. As an alternate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either PVC or CPVC.
Low temperature solvent cement is recommended during cooler weather. Metal or plastic strapping may be used for vent pipe hangers. Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket.

Canadian Applications Only - Pipe, fittings, primer and solvent cement used to vent (exhaust) this appliance must
be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent (exhaust) system. In
addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection. NOTE - The intake coupling on the furnace is ABS material. Use transitional solvent to make connections to PVC pipe. NOTE - Vent pipe must be installed with provided vent adapter. See FIGURE 23.

TABLE 3

OUTDOOR TERMINATION USAGE*

STANDARD

CONCENTRIC

Input Size

Vent Pipe Dia. in.

Flush Mount Kit

Wall Kit

2 inch

3 inch

51W11 (US) 51W12 (CA)

22G44 (US) 430G28 (CA)

44J40 (US) 481J20 (CA)

Field Fabricated

1-1.2 inch

2 inch

3 inch

71M80 (US) 444W92 (CA)

69M29 (US) 444W92 (CA)

60L46 (US) 444W93 (CA)

3YES

YES

1YES

5YES

2YES

040

3YES

YES

1YES

5YES

2YES

3YES

YES

1YES

5YES

2YES

060

3YES

YES

1YES

5YES

2YES

3YES

080

3YES

YES YES

5YES 5YES

YES YES

YES

100

YES

YES YES

5YES 5YES

YES YES

NOTE - Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total vent length calculations. See vent length tables.
* Kits must be properly installed according to kit instructions. 1Requires field-provided outdoor 1-1/2" exhaust accelerator. 2Concentric kits 71M80 and 44W92 include 1-1/2" outdoor accelerator, when uses with 040 and 060 input models.
3 Flush mount kits 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 040, 060 and 080 input models. 4 Termination kits 30G28, 44W92, 4493 and 81J20 are certified to ULC S636 for use in Canada only. 5 See table 8 for vent accelerator requirements.

Page 15

Joint Cementing Procedure
All cementing of joints should be done according to the specifications outlined in ASTM D 2855.
DANGER
DANGER OF EXPLOSION!
Fumes from PVC glue may ignite during system check. Allow fumes to dissipate for at least 5 minutes before placing unit into operation.
1 - Measure and cut vent pipe to desired length.
2 - De-bur and chamfer end of pipe, removing any ridges or rough edges. If end is not chamfered, edge of pipe may remove cement from fitting socket and result in a leaking joint. NOTE - Check the inside of vent pipe thoroughly for any obstruction that may alter furnace operation.
3 - Clean and dry surfaces to be joined.
4 - Test fit joint and mark depth of fitting on outside of pipe.
5 - Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket. NOTE - Time is critical at this stage. Do not allow primer to dry before applying cement.
6 - Promptly apply solvent cement to end of pipe and inside socket surface of fitting. Cement should be applied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe.
7 - Immediately after applying last coat of cement to pipe, and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into socket until it bottoms out. Turn PVC pipe 1/4 turn during assembly (but not after pipe is fully inserted) to distribute cement evenly. DO NOT turn ABS or cellular core pipe. NOTE - Assembly should be completed within 20 seconds after last application of cement. Hammer blows should not be used when inserting pipe.
8 - After assembly, wipe excess cement from pipe at end of fitting socket. A properly made joint will show a bead around its entire perimeter. Any gaps may indicate an improper assembly due to insufficient solvent.
9 - Handle joints carefully until completely set.

Venting Practices NOTE - For any Low GWP refrigerant systems with exposed line set joints installed in the same space, each non-direct vent furnace system must have a refrigerant detection sensor installed below the level of the burners (See SECONDARY SENSOR REQUIREMENTS on page 47). Any direct vent furnace system is not subject to this requirement
HORIZONTAL PIPING SUPPORT GUIDELINES SCHEDULE 40 PVC - 5'
all other pipe* - 3'

* See Piping and Fittings Specifications table NOTE - Vertical support guidelines: Recommend following the guidelines in the International Plumbing code for PVC.
NOTE - Isolate piping at the point where it exits the outside wall or roof in order to prevent transmission of vibration to the structure.

Wall Thickness Guidelines
24" maximum 3/4" minimum

inside

Wall outside

FIGURE 21
1 - In areas where piping penetrates joists or interior walls, hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger.
2 - When furnace is installed in a residence where unit is shut down for an extended period of time, such as a vacation home, make provisions for draining condensate collection trap and lines.

Page 16

REPLACING FURNACE THAT WAS PART OF A COMMON VENT SYSTEM
CHIMNEY OR GAS
VENT (Check sizing
for water heater only)

FURNACE (Replaced)

WATER HEATER
OPENINGS (To Adjacent
Room)

Flue Coupling To Exhaust Coupling

PVC Exhaust Pipe
Top Band (torque to 40in-lbs)
Bottom Band (torque to 40in-lbs)

Flue Couplig
Furnace Exhaust Coupling
Furnace Top Panel

If replacing a furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the heat of the original furnace flue products, the existing vent pipe is probably oversized for the single water heater or other appliance. The vent should be checked for proper draw with the remaining appliance.
FIGURE 22
Exhaust Piping FIGURE 23, FIGURE 26 and FIGURE 27
The vent adapter must be attached to the exhaust coupling on the furnace top panel. Use provided bands. See steps below.
1 - Remove the caution tag from vent adapter.
2 - Fully insert vent adapter with both bands loosely attached on the furnace exhaust coupling
3 - Insert PVC exhaust pipe through vent adapter. Ensure vent pipe is fully seated into exhaust coupling.
4 - Tighten both top and bottom bands to 40in-lbs. NOTE - PVC / ABS / NORYL transition solvent cement WELD-ON 4052 (or equivalent) must be used for connecting PVC exhaust pipe to NORYL furnace exhaust coupling. Route piping to outside of structure. Continue with installation following instructions given in piping termination section.
CAUTION
Do not discharge exhaust into an existing stack or stack that also serves another gas appliance. If vertical discharge through an existing unused stack is required, insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack.
CAUTION
The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.

FIGURE 23
Vent Piping Guidelines NOTE - Lennox has approved the use of DuraVent® and Centrotherm manufactured vent pipe and terminations as an option to PVC. When using the PolyPro® by DuraVent or InnoFlue® by Centrotherm venting system the vent pipe requirements stated in the unit installation instruction minimum & maximum vent lengths, termination clearances, etc. apply and must be followed. Follow the instructions provided with PoyPro by DuraVent and InnoFlue by Centrotherm venting system for assembly or if requirements are more restrictive. The PolyPro by Duravent and InnoFlue by Centrotherm venting system must also follow the uninsulated and unconditioned space criteria listed in TABLE 7.
The EL195UHNEK can be installed as either a Non-Direct Vent or a Direct Vent gas central furnace.
NOTE - In Non-Direct Vent installations, combustion air is taken from indoors and flue gases are discharged outdoors. In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors. Intake and exhaust pipe sizing -- Size pipe according to TABLE 4 and TABLE 5. Count all elbows inside and outside the home. Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping Terminations should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination. Refer to TABLE 8.
In some applications which permit the use of several different sizes of vent pipe, a combination vent pipe may be used. Contact Lennox' Application Department for assistance in sizing vent pipe in these applications.

Page 17

NOTE - The exhaust collar on all models is sized to accommodate 2" Schedule 40 vent pipe. In horizontal applications, any transition to exhaust pipe larger than 2" must be made in vertical runs of the pipe. Therefore a 2" elbow must be added before the pipe is transitioned to any size larger than 2". This elbow must be added to the elbow count used to determine acceptable vent lengths. Contact the Application Department for more information concerning sizing of vent systems which include multiple pipe sizes.

Horizontal Installation Offset Requirements Exhaust Pipe

Horizontal Gas Furnace

12" Max.

12" Min.

Use the following steps to correctly size vent pipe diameter.
Pipe Size Process
What is the furnace capacity? 1 040, 060, 080, or
100?

Which style termination

being used?

Standard or concentric?

See table 3..

Which needs

most elbows? Intake or

exhaust?

NOTE ward unit. A minimum of 1/4" (6mm) drop for each 12" (305mm) of horizontal run is mandatory for drainage.
NOTE - Exhaust piping should be checked carefully to make sure there are no sags or low spots.

FIGURE 24

TABLE 4

MINIMUM VENT PIPE LENGTHS

EL195UHNEK Model

MIN. VENT LENGTH*

040, -060, -080, 100

15 ft. or 5 ft. plus 2 elbows or 10 ft. plus 1 elbow

*Any approved termination may be added to the minimum length listed. Two 45 degree elbows are equivalent to one 90 degree elbow.

How many elbows? 4 Count all elbows inside
and outside house.

Desired pipe size? 2" or 3"

What is the altitude of 6 the furnace installation?

Use table 5 or 6 to find

max intake or exhaust pipe length. Includes all vent

pipe and elbows inside and

outside the house.

FIGURE 25
CAUTION
Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations.

Page 18

TABLE 5

NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.

NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

Standard Termination at Elevation 0 - 4500 ft

2" Pipe

3" Pipe

Number Of 90° Elbows

Model

040

060

080

100

040

060

080

100

138

137

118

133

132

113

128

127

108

123

122

103

118

117

113

112

n/a

108

107

103

102

n/a

Concentric Termination at Elevation 0 - 4500 ft

2" Pipe

3" Pipe

Number Of 90° Elbows

Model

040

060

080

100

040

060

080

100

121

114

116

109

111

104

106

101

n/a

Page 19

TABLE 5 Continued

NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.

NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

Standard Termination at Elevation 4501 - 7500 ft

2" Pipe

3" Pipe

Number Of 90° Elbows

Model

040

060

080

100

040

060

080

100

138

105

100

133

100

128

123

118

n/a

113

108

n/a

103

Concentric Termination at Elevation 4501 - 7500 ft

2" Pipe

3" Pipe

Number Of 90° Elbows

Model

040

060

080

100

040

060

080

100

121

116

111

106

101

n/a

Page 20

TABLE 6

Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space For Intake Air in Feet

NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

Standard Termination at Elevation 0 - 4500 ft

2" Pipe

3" Pipe

Number Of 90° Elbows

Model

040

060

080

100

040

060

080

100

118

117

113

112

108

107

103

102

n/a

Standard Termination at Elevation 4501 - 7500 ft

2" Pipe

3" Pipe

Number Of 90° Elbows

Model

040

060

080

100

040

060

080

100

118

113

108

103

n/a

Page 21

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS

EXHAUST

EXHAUST INTAKE

or 2"

Appliance

TRANSITION

Adaptor

*2"

INTAKE

Appliance Adaptor

*2"

TRANSITION

DO NOT transition from smaller to larger pipe in horizontal runs
of exhaust pipe.

* When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
FIGURE 26

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT APPLICATIONS (RIGHT HAND DISCHARGE SHOWN)

12" max.

EXHAUST

Appliance Adaptor

EXHAUST

*2" *2"

2" INTAKE
2"
DO NOT transition from smaller to larger pipe in horizontal runs
of exhaust pipe.

45° MAX

Appliance Adaptor
INTAKE 2"
2"

SIDE VIEW * When transitioning up in pipe size, use the shortest length of 2" PVC pipe possible.
FIGURE 27
Page 22

Intake Piping
The EL195UHNEK furnace may be installed in either direct vent or non-direct vent applications. In non-direct vent applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered and guidelines listed in Combustion, Dilution and Ventilation Air section must be followed. Follow the next two steps when installing the unit in Direct Vent applications, where combustion air is taken from outdoors and flue gases are discharged outdoors. The provided air intake screen must not be used in direct vent applications (outdoors).
1 - Use transition solvent cement or a sheet metal screw to secure the intake pipe to the inlet air connector.
CAUTION
Carefully apply solvent cement to air intake fitting and avoid plugging hose barbed fitting in the coupling. See FIGURE 28.
Combustion Air Intake

TYPICAL AIR INTAKE PIPE CONNECTIONS UPFLOW NON-DIRECT VENT APPLICATIONS
INTAKE DEBRIS SCREEN (Provided)

Hose Barb Fitting
FIGURE 28
2 - Route piping to outside of structure. Continue with installation following instructions given in general guidelines for piping terminations and intake and exhaust piping terminations for direct vent sections. Refer to TABLE 5 for pipe sizes.
Follow the next two steps when installing the unit in NonDirect Vent applications where combustion air is taken from indoors and flue gases are discharged outdoors.
1 - Use field-provided materials and the factoryprovided air intake screen to route the intake piping as shown in FIGURE 29 or FIGURE 30. Maintain a minimum clearance of 3" (76mm) around the air intake opening. The air intake opening (with the protective screen) should always be directed forward or to either side in the upflow position, and either straight out or downward in the horizontal position. The air intake piping must not terminate too close to the flooring or a platform. Ensure that the intake air inlet will not be obstructed by loose insulation or other items that may clog the debris screen.
2 - If intake air is drawn from a ventilated attic (FIGURE 31) or ventilated crawlspace (FIGURE 32) the exhaust vent length must not exceed those listed in TABLE 6. If 3" diameter pipe is used, reduce to 2" diameter pipe at the termination point to accommodate the debris screen.
3 - Use a sheet metal screw to secure the intake pipe to the connector, if desired.

NOTE - Debris screen and elbow may be rotated, so that screen may be positioned to face forward or to either side.
FIGURE 29 TYPICAL AIR INTAKE PIPE CONNECTIONS
HORIZONTAL NON-DIRECT VENT APPLICATIONS (Horizontal Right-Hand Air Discharge Application Shown)
INTAKE DEBRIS SCREEN (Provided)
NOTE - Debris screen may be positioned with elbow rotated to face down or face up.
FIGURE 30

Page 23

CAUTION
If this unit is being installed in an application with combustion air coming in from a space serviced by an exhaust fan, power exhaust fan, or other device which may create a negative pressure in the space, take care when sizing the inlet air opening. The inlet air opening must be sized to accommodate the maximum volume of exhausted air as well as the maximum volume of combustion air required for all gas appliances serviced by this space.

EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Attic and Outlet Air to Outside)

Roof Terminated Exhaust Pipe

Ventilation Louvers
Inlet Air (Minimum 12 in.(305mm) Above attic floor)

*Intake Debris Screen
(Provided)
Furnace

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of the total input rating of all equipment in the enclosure.
FIGURE 31
EQUIPMENT IN CONFINED SPACE (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside)
Roof Terminated Exhaust Pipe

Ventilation

Louvers

Furnace

(Crawl space)

Inlet Air (Minimum 12 in.(305mm) Above crawl space floor)

Coupling or 3 in. to 2 in. Transition (Field Provided)

*Intake Debris Screen Provided)

General Guidelines for Vent Terminations
In Non-Direct Vent applications, combustion air is taken from indoors and the flue gases are discharged to the outdoors. The EL195UHNEK is then classified as a non-direct vent, Category IV gas furnace.
In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the outdoors. The EL195UHNEK is then classified as a direct vent, Category IV gas furnace.
In both Non-Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA-B149 Natural Gas and Propane Installation Codes in Canada for details.
Position termination according to location given in FIGURE 34 or FIGURE 35. In addition, position termination so it is free from any obstructions and 12" above the average snow accumulation.
At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8m) of an outdoor AC unit because the condensate can damage the painted coating. NOTE - See TABLE 7 for maximum allowed exhaust pipelength without insulation in unconditioned space during winter design temperatures below 32°F (0°C). If required exhaust pipe should be insulated with 1/2" (13mm) Armaflex or equivalent. In extreme cold climate areas, 3/4" (19mm) Armaflex or equivalent may be necessary. Insulation must be protected from deterioration. Armaflex with UV protection is permissible. Basements or other enclosed areas that are not exposed to the outdoor ambient temperature and are above 32 degrees F (0°C) are to be considered conditioned spaces.
IMPORTANT
Do not use screens or perforated metal in exhaust terminations. Doing so will cause freeze-ups and may block the terminations.
IMPORTANT
For Canadian Installations Only:
In accordance to CSA International B149 installation codes, the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches (305mm).

Page 24

TABLE 7

Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace

Winter Design Vent

Temp1 °F (°C) Pipe Diam

040

Unit Input Size

060

080

100

32 to 21 (0 to -6)

PVC

2PP

PVC

2PP

PVC

2PP

PVC

2PP

2 in

3 in

20 to 1

2 in

(-7 to -17)

3 in

N/A

0 to -20

2 in

(-18 to -29)

3 in

N/A

1Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook. 2 Poly-Propylene vent pipe (PP) by Duravent and Centrotherm. NOTE - Concentric terminations are the equivalent of 5' and should be considered when measuring pipe length. NOTE - Maximum uninsulated vent lengths listed may include the termination(vent pipe exterior to the structure) and cannot exceed 5 linear feet or the maximum allowable intake or exhaust vent length listed in TABLE 5 or TABLE 6 which ever is less. NOTE - - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See FIGURE 33.

Conditioned Space

Pipe Insulation
Unconditioned Space

FIGURE 33

Exhaust Pipe
Intake Pipe

Page 25

VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE USA AND CANADA
INSIDE CORNER DETAIL
G

D E B

H A

Fixed

Operable

Closed

Operable

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

US Installations1

Canadian Installations2

A =

Clearance above grade, veranda,

porch, deck or balcony

12 inches (305mm) or 12 in. (305mm) above average snow accumulation.

B =

Clearance to window or

door that may be opened

C =

Clearance to permanently

closed window

4 feet (1.2 m) below or to side of opening; 1 foot (30cm) above opening
* 12"

6 inches (152mm) for appliances <10,000 Btuh (3kw), 12 inches (305mm) for appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m) for appliances > 100,000 Btuh (30kw)
* 12"

D = Vertical clearance to ventilated soffit located above the terminal within a
horizontal distance of 2 feet (610 mm) from the center line of the terminal

E =

Clearance to unventilated soffit

* Equal to or greater than soffit depth.

F =

Clearance to outside corner

* No minimum to outside corner

G = Clearance to inside corner

H =

* 3 feet (.9m) within a height 15 feet (4.5m) 3 feet (.9m) within a height 15 feet (4.5m)

tended above meter / regulator assembly

above the meter / regulator assembly

I =

Clearance to service regulator

vent outlet

* 3 feet (.9m)

3 feet (.9m)

J =

Clearance to non-mechanical air

pliance

4 feet (1.2 m) below or to side of opening; 1 foot (30 cm) above opening

6 inches (152mm) for appliances <10,000 Btuh (3kw), 12 inches (305mm) for appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m) for appliances > 100,000 Btuh (30kw)

K = ply inlet

3 feet (.9m) above if within 10 feet (3m) horizontally

6 feet (1.8m)

L = Clearance above paved sidewalk or paved driveway located on public property

7 feet (2.1m)

M = Clearance under veranda, porch, deck or balcony *12 inches (305mm)

12 inches (305mm)

1 In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code 2 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible.

*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearance will be in accordance with local installation codes and the requirements of the lation instructions." NOTE - This figure is intended to illustrate clearance requirement and does not serve as a substitute for locally adopted installation codes.

FIGURE 34

Page 26

D E B

VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE US AND CANADA
INSIDE CORNER DETAIL
G

Fixed

Operable

Closed

Operable

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

US Installations1

Canadian Installations2

A =

Clearance above grade, veranda,

porch, deck or balcony

12 inches (305mm) or 12 in. (305mm) above average snow accumulation.

B =

Clearance to window or

door that may be opened

C =

Clearance to permanently

closed window

6 inches (152mm) for appliances <10,000 6 inches (152mm) for appliances <10,000

Btuh (3kw), 12 inches (305mm) for

pliances > 10,000 Btuh (3kw) and <50,000 appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

pliances > 50,000 Btuh (15kw)

for appliances > 100,000 Btuh (30kw)

* 12"

D = Vertical clearance to ventilated soffit located above the terminal within a
horizontal distance of 2 feet (610mm) from the center line of the terminal

* Equal to or greater than soffit depth * Equal to or greater than soffit depth

E =

Clearance to unventilated soffit

F =

Clearance to outside corner

* Equal to or greater than soffit depth * No minimum to outside corner

G =

Clearance to inside corner

H = tended above meter / regulator assembly

3 feet (.9m) within a height 15 feet (4.5m) 3 feet (.9m) within a height 15 feet (4.5m)

above the meter / regulator assembly

I =

Clearance to service regulator

vent outlet

* 3 feet (.9m)

3 feet (.9m)

J =

Clearance to non-mechanical air

pliance
K = ply inlet

6 inches (152mm) for appliances <10,000 6 inches (152mm) for appliances <10,000

Btuh (3kw), 12 inches (305mm) for

pliances > 10,000 Btuh (3kw) and <50,000 appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

pliances > 50,000 Btuh (15kw)

for appliances > 100,000 Btuh (30kw)

3 feet (.9m) above if within 10 feet (3m) horizontally

6 feet (1.8m)

L = Clearance above paved sidewalk or paved driveway located on public property

* 7 feet (2.1m)

7 feet (2.1m)

M = Clearance under veranda, porch, deck or balcony

*12 inches (305mm)

12 inches (305mm)

1 In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code 2 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible.

*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearance will be in accordance with local installation codes and the requirements of the gas supplier and these installation instructions."
NOTE - This figure is intended to illustrate clearance requirements and does not serve as a substitute for locally adopted installation codes.

FIGURE 35

Page 27

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations
NOTE - In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors. NOTE - Flue gas may be slightly acidic and may adversely affect some building materials. If any vent termination is used and the flue gasses may impinge on the building material, a corrosion-resistant shield (minimum 24 inches square) should be used to protect the wall surface. If the optional tee is used, the protective shield is recommended. The shield should be constructed using wood, plastic, sheet metal or other suitable material. All seams, joints, cracks, etc. in the affected area should be sealed using an appropriate sealant. See FIGURE 44.
Intake and exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In attic or closet installations, vertical termination through the roof is preferred. FIGURE 36 through FIGURE 43 show typical terminations.
1 - Intake and exhaust terminations are not required to be in the same pressure zone. You may exit the intake on one side of the structure and the exhaust on another side (FIGURE 37). You may exit the exhaust out the roof and the intake out the side of the structure (FIGURE 38).
2 - Intake and exhaust pipes should be placed as close together as possible at termination end (refer to illustrations). Maximum separation is 3" (76mm) on roof terminations and 6" (152mm) on side wall terminations. NOTE - When venting in different pressure zones, the maximum separation requirement of intake and exhaust pipe DOES NOT apply.
3 - On roof terminations, the intake piping should terminate straight down using two 90° elbows (FIGURE 36).
4 - Exhaust piping must terminate straight out or up as shown. A reducer may be required on the exhaust piping at the point where it exits the structure to improve the velocity of exhaust away from the intake piping. See TABLE 8. NOTE - Care must be taken to avoid recirculation of exhaust back into intake pipe.
5 - On field-supplied terminations for side wall exit, exhaust piping may extend a maximum of 12 inches (305mm) for 2" PVC and 20 inches (508mm) for 3" (76mm) PVC beyond the outside wall. Intake piping should be as short as possible. See FIGURE 44.
6 - On field-supplied terminations, a minimum distance between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8" and a minimum distance of 6" with a termination elbow. See FIGURE 44.

Inches(mm)

3"(76mm) MAX.

8" (203mm) MIN
12" (305mm) ABOVE AVERAGE SNOW ACCUMULATION

UNCONDITIONED ATTIC SPACE

3" (76mm) OR 2" (51mm) PVC
PROVIDE SUPPORT FOR INTAKE AND EXHAUST LINES DIRECT VENT ROOF TERMINATION KIT (15F75 or 44J41)
FIGURE 36
Exiting Exhaust and Intake Vent (different pressure zone)

Exhaust Pipe

Furnace
FIGURE 37

Inlet Air (Minimum 12 in. 305 MM) above grade or snow
accumulation

Exiting Exhaust and Intake Vent (different pressure zone)

Roof Terminated Exhaust Pipe

Furnace

Inlet Air (Minimum 12 in. 305 MM) above grade or snow
accumulation

FIGURE 38

TABLE 8

EXHAUST PIPE TERMINATION SIZE REDUCTION

EL195UHNEK Model

Termination Pipe Size

*040, *060

1-1/2" (38mm)

*080 100

2" (51mm)

*Use the provided 1-1/2" accelerator if matched with the flushmount termination.

Page 28

7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported. At least one bracket must be used within 6" from the top of the elbow and then every 24" (610mm) as shown in FIGURE 44, to prevent any movement in any direction. When exhaust and intake piping must be run up an outside wall, the exhaust piping must be terminated with pipe sized per table 8.The intake piping may be equipped with a 90° elbow turndown. Using turndown will add 5 feet (1.5m) to the equivalent length of the pipe.
8 - A multiple furnace installation may use a group of up to four terminations assembled together horizontally, as shown in FIGURE 42.

2" EXTENSION FOR 2" PVC PIPE1" EXTENSION FOR 3" PVC PIPE
4''
FURNACE INTAKE PIPE
FLAT SIDE

FURNACE EXHAUST
PIPE
GLUE EXHAUST END FLUSH INTO
TERMINATION
1-1/2" ACCELERATOR

FLUSH-MOUNT SIDE WALL TERMINATION KIT 51W11 (US) or 51W12 (Canada)
FIGURE 39

12" (305mm)
Minimum Above Average
Snow Accumulation

Accelerator not required for 3" concentric

INTAKE

FLASHING (Not Furnished)

CLAMP

SHEET METAL STRAP (Clamp and sheet metal strap must be field installed to support the weight of the termination kit.)
FIELD-PROVIDED REDUCER MAY BE REQUIRED
TO ADAPT DIFFERENT VENT PIPE SIZE TO TERMINATION

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION 71M80, 69M29 or 60L46 (US) 44W92 or 44W93 (Canada)

FIGURE 40

FIELD-PROVIDED REDUCER MAY BE REQUIRED TO ADAPT DIFFERENT VENT PIPE SIZE TO TERMINATION OUTSIDE
WALL
EXHAUST AIR

Accelerator not required for 3" concentric
INTAKE AIR EXHAUST AIR

INTAKE AIR

CLAMP (Not Furnished)

INTAKE 12" (305mm) Min. AIR above grade or average snow ac cumulation. GRADE

DIRECT VENT CONCENTRIC WALL TERMINATION 71M80, 69M29 or 60L46 (US) 44W92 or 44W93 (Canada)

FIGURE 41

EXHAUST VENT
INTAKE AIR
Inches (mm)

5" (127mm)

12" (305mm) 5-1/2" (140mm)

18" MAX. (457mm)

Front View

EXHAUST VENT 12" (305mm) Min. above grade or

INTAKE cumulation. AIR

optional intake elbow

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT INSTALLATION OF DIRECT VENT WALL TERMINATION KIT
(30G28 or 81J20)

FIGURE 42

DIRECT VENT APPLICATION USING EXISTING CHIMNEY

STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION
OF ROOF SLOPE *

8" - 12" (203mm - 305mm)

3" - 8" (76mm203mm)

Minimum 12" (305MM) above chimney top
plate or average snow accumulation

INTAKE PIPE INSULATION (optional)
SHEET METAL TOP
PLATE

INSULATE TO FORM
SEAL

SHOULDER OF FITTINGS PROVIDE SUPPORT
OF PIPE ON TOP PLATE
ALTERNATE INTAKE PIPE

3" - 8" (76mm203mm)

EXTERIOR PORTION OF
CHIMNEY

NOTE - Do tical discharge through an existing unused chimney or stack is required, insert piping inside trated. In any exterior portion of chimney, the exhaust vent must be insulated.
FIGURE 43

Page 29

NOTE - FIELD-PROVIDED REDUCER MAY BE
REQUIRED TO ADAPT LARGER VENT PIPE SIZE
TO TERMINATION
D

FIELD FABRICATED WALL TERMINATION

A- Minimum clearance above grade or average

snow accumulation

B- Maximum horizontal

separation between

intake and exhaust

2" (51mm) Vent Pipe
12" (305 mm)
6" (152 mm)

3" (76mm) Vent Pipe
12" (305 mm)
6" (152 mm)

Intake Elbow C2

C1 -Minimum from end of exhaust to inlet of intake 8" (203 mm) 8" (203 mm)

STRAIGHT

APPPLICATION

C2 -Minimum from end of exhaust to inlet of intake 6" (152 mm) 6" (152 mm)

* WALL SUPPORT

D- Maximum exhaust pipe length

12" (305 mm) 20" (508 mm)

D E

E- Maximum wall support distance from top of each 6" (152 mm) 6" (152 mm)

pipe (intake/exhaust)

See maximum allowable venting tables for venting

lengths with this arrangement.

* Use wall support every 24" (610 mm). Use two

wall supports if extension is greater than

24" (610 mm) but less than 48" (1219 mm).

EXTENDED APPLICATION

NOTE - One wall support must be within 6" (152 mm) from top of each pipe (intake and exhaust) to prevent movement in any direction.

ALTERNATE TERMINATIONS (TEE & FORTY-FIVE DEGREE ELBOWS ONLY)

C 2
A

D
E B
C 2
A

2" (51mm)

3" (76mm)

Vent Pipe

Exhaust

A - Clearance above Grade or average snow

12" (305 mm) Min 12" (305 mm) Min

accumulation

B - Horizontal separation

6" (152mm)min 6" (152mm)min

between intake and exhaust 24" (610mm )Max 24" (610mm )Max

Intake Elbow

C A

C - Minimum from end of

9" (227mm)

exhaust to inlet of intake

D - Exhaust pipe length

12" (305mm)min 12" (305mm)min 16" (405mm )Max 16" (405mm )Max

D 1
E

E - Wall support distance from 6" (152mm) Max top of each pipe (intake/exhaust)

6" (152mm) Max

B 1

B 12"

Front View of Intake and Exhaust

12"

Intake

Exhaust

1The exhaust termination tee should be connected to the 2" or 3" PVC flue pipe as shown in the illustration. In horizontal tee applications there must be be a minimum of 3 ft away from covered patios or any living ares and cannot be within 3 ft of a window. Do not use an accelerator in applications that include an exhaust termination tee. The accelerator is not required.
2 As required. Flue gas may be acidic and may adversely affect some building materials. If a side wall vent termination is used and flue gases will impinge on the building materials, a corrosion-resistant shield (24 inches square) should be used to protect the wall surface. If optional tee is used, the protective shield
is recommended. The shield should be constructed using wood, sheet metal or other suitable material. All seams, joints, cracks, etc. in affected area, should be sealed using an appropriate sealant. 3 Exhaust pipe 45° elbow can be rotated to the side away from the combustion air inlet to direct exhaust away from adjacent property. The exhaust must never be directed toward the combustion air inlet.

FIGURE 44

Page 30

Details of Exhaust Piping Terminations for Non-Direct Vent Applications
Exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In attic or closet installations, vertical termination through the roof is preferred.FIGURE 45 and FIGURE 46 show typical terminations.
1 - Exhaust piping must terminate straight out or up as shown. The termination pipe must be sized as listed in TABLE 8.The specified pipe size ensures proper velocity required to move the exhaust gases away from the building.
2 - On field supplied terminations for side wall exit, exhaust piping may extend a maximum of 12 inches (305mm) for 2" PVC and 20 inches (508mm) for 3" (76mm) PVC beyond the outside wall.
3 - If exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported every 24 inches (610mm). When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow.
4 - Distance between exhaust pipe terminations on multiple furnaces must meet local codes.
12" (305mm) ABOVE AVE.
SNOW ACCUMULATION

NON-DIRECT VENT APPLICATION USING EXISTING CHIMNEY
STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION
OF ROOF SLOPE

Minimum 12" (305MM) above chimney top
plate or average snow accumulation
SHEET METAL TOP
PLATE
INSULATE TO FORM
SEAL

SHOULDER OF FITTINGS PROVIDE SUPPORT
OF PIPE ON TOP PLATE
EXTERIOR PORTION OF
CHIMNEY

NOTE - Do tical discharge through an existing unused chimney or stack is required, insert piping inside trated. In any exterior portion of chimney, the exhaust vent must be insulated.
FIGURE 46
Venting In A Crawl Space

3" (76mm) OR 2" (51mm) PVC
PROVIDE SUPPORT FOR EXHAUST LINES

UNCONDITIONED ATTIC SPACE

NON-DIRECT VENT ROOF TERMINATION KIT (15F75 or 44J41)
FIGURE 45
Crawl Space and Extended Horizontal Venting
Lennox provides kit 51W18 (USA) kit 15Z70 (Canada) to install 2" or 3" PVC exhaust piping through the floor joists and into the crawl space. See FIGURE 47. This kit can also be used as a supplemental drain for installations with condensate run back in the vent pipe (ie. long horizontal runs, unconditioned spaces, etc.).

Basement Floor

KIT 51W18 (USA) KIT 15Z70 (CANADA)

FIGURE 47
Condensate Piping
This unit is designed for either right- or left-side exit of condensate piping in upflow applications. In horizontal applications, the condensate trap must extend below the unit. An 8" service clearance is required for the condensate trap.

Page 31

Refer to FIGURE 48 and FIGURE 50 for condensate trap locations. FIGURE 56 shows trap assembly using 1/2" PVC or 3/4" PVC. NOTE - If necessary the condensate trap may be installed up to 5' away from the furnace. Use PVC pipe to connect trap to furnace condensate outlet. Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.
1 - Determine which side condensate piping will exit the unit, location of trap, field-provided fittings and length of PVC pipe required to reach available drain.
2 - Use a large flat head screw driver or a 1/2" drive socket extension and remove plug (figure 47) from the cold end header box at the appropriate location on the side of the unit. Install provided 3/4 NPT street elbow fitting into cold end header box. Use Teflon tape or appropriate pipe dope. NOTE - Cold end header box drain plugs are factory installed. Check the unused plug for tightness to prevent leakage.
3 - Install the cap over the clean out opening at the base of the trap. Secure with clamp. See FIGURE 56.
CONDENSATE TRAP AND PLUG LOCATIONS (Unit shown in upflow position)
Trap (same on right side)
1-1/2 in.
Plug (same on left side)

5 - FIGURE 51 and FIGURE 53 shows the furnace and evaporator oil using a separate drain. If necessary the condensate line from the furnace and evaporator coil can drain together. See FIGURE 54 and FIGURE 55. Upflow furnace FIGURE 54 - In upflow furnace applications the field provided vent must be a minimum 1" to a maximum 2" length above the condensate drain outlet connection. Any length above 2" may result in a flooded heat exchanger if the combined primary drain line were to become restricted. Horizontal furnace FIGURE 55 - In horizontal furnace applications the field provided vent must be a minimum 4" to a maximum 5" length above the condensate drain outlet connection. Any length above 5" may result in a flooded heat exchanger if the combined primary drain line were to become restricted. NOTE - In horizontal applications it is recommended to install a secondary drain pan underneath the unit and trap assembly. NOTE - Appropriately sized tubing and barbed fitting may be used for condensate drain. Attach to the drain on the trap using a hose clamp. See FIGURE 49.
IMPORTANT
Do not use copper tubing or existing copper condensate lines for drain line.
Field Provided Drain Components

Elbow

NOTE - In upflow applications where side return
sate trap, filter rack must be installed beyond condensate trap or trap must be re-located to avoid interference.
FIGURE 48 4 - Install drain trap using appropriate PVC fittings, glue
all joints. Glue the provided drain trap as shown in FIGURE 56. Route the condensate line to an open drain. Condensate line must maintain a 1/4" downward slope from the furnace to the drain.

Tubing

Barbed Fitting Hose Clamp

FIGURE 49
6 - If unit will be started immediately upon completion of installation, prime trap per procedure outlined in Unit Start-Up section. Condensate line must slope downward away from the trap to drain. If drain level is above condensate trap, condensate pump must be used. Condensate drain line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) kit no. 26K69.

Page 32

CONDENSATE TRAP LOCATIONS (Unit shown in upflow position with remote trap)
Field ProvidedVent Min. 1" Above Condensate
Drain Connection
1" Min. 2" Max.
*5' max. PVC PipeOnly
Trap Can Be Installed a Maximum 5' From Furnace

Condensate Trap With Optional Overflow Switch

From Evaporator Coil

HorizontalFurnace4" Min. to 5" Max.above condensatedrain connection)

Optional

FurnaceCondensate Drain Connection

To Drain

*Piping from furnace must slope down a minimum 1/4" per ft. toward trap
FIGURE 50
Furnace With Evaporator Coil Using A Separate Drain

(Trap at coil is optional)
Field Provided Vent (1" min. 2" max. above condensate connection)
Condensate Drain Connection

Evaporator drain line required

FIGURE 52

FIGURE 51

Page 33

Furnace with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position)

Evaporator Coil

4"min 5"max
5' max. PVC Pipe Only
Condensate Drain Connection

Field Provided Vent (4" min. to 5" max. above condensate connection)

Drain Pan

(Trap at coil is optional) Piping from furnace and evaporator coil must slope down a minimum 1/4" per ft. toward trap

FIGURE 53

Furnace with Evaporator Coil Using a Common Drain
Evaporator drain line required
(Trap at coil is optional)

IMPORTANT
When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must be vented to relieve pressure in order for the furnace pressure switch to operate properly.

(1" min. to 2" Max.above condensatedrain connection)
Condensate Drain Connection

FIGURE 54
Furnace with Evaporator Coil Using a Common Drain (Unit shown in horizontal left-hand discharge position)

Drain Pan

Evaporator Coil

4"min 5"max
5' max. PVC Pipe Only
Condensaet Drain Connection

(Trap at coil is optional) Piping from furnace and evaporator coil must slope down a minimum 1/4" per ft. toward trap
FIGURE 55

(4" min. to 5" Max.above condensatedrain connection)

Page 34

TRAP / DRAIN ASSEMBLY USING 1/2" PVC OR 3/4" PVC Optional Condensate Drain Connection

Adapter 3/4 inch slip X 3/4 inch mpt (not furnished)

90° Street Elbow 3/4 inch PVC (not furnished)

90° Street Elbow 3/4 inch PVC ( furnished)

Condensate Drain Connection In Unit

To Trap

Optional DrainPiping FromTrap

Adapter 3/4 inch slip X 3/4 inch mpt (not furnished)

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Vent

5 Feet Maximum

Condensate Drain Connection In Unit

90° Elbow 3/4 inch PVC (Not Furnished)
1/2 inch PVC Pipe (Not Furnished)

3/4 inch PVC Pipe (Not Furnished)

Drain Assembly for 1/2 inch Drain Pipe

Coupling 3/4 inch slip X slip (Not Furnished)

1/2 inch PVC Pipe (Not Furnished)

To Drain

90° Elbow 1/2 inch PVC (Not Furnished)

Drain Assembly for 3/4 inch Drain Pipe

Drain Trap Assembly (Furnished)

90° Elbow 3/4 inch PVC (Not Furnished)

90° Elbow
3/4 inch PVC (Not Furnished)

Drain Trap Clean Out

To Drain
DrainTrap Assembly (Furnished)

To Coupling 3/4 inch slip X slip

Drain

(Not Furnished)

DrainTrap Assembly with 1/2 inch Piping
1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit
Vent

DrainTrap Assembly with 3/4 inch Piping
1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit
Vent

7 (178)

1/2 inch

Condensate Drain Connection In Unit

3/4 inch

Condensate Drain Connection In Unit

To Drain

FIGURE 56

To Drain

Page 35

Gas Piping
Gas supply piping should not allow more than 0.5"W.C. drop in pressure between gas meter and unit. Supply gas pipe must not be smaller than unit gas connection.
CAUTION
If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet. The flexible connector can then be added between the black iron pipe and the gas supply line.
WARNING
Do not over torque (800 in-lbs) or under torque (350 inlbs) when attaching the gas piping to the gas valve.
1 - Gas piping may be routed into the unit through the right-hand side only. Supply piping enters into the gas valve from the side of the valve as shown in FIGURE 58. Connect the gas supply piping into the gas valve. The maximum torque is 800 in lbs and minimum torque is 350 in lbs when attaching the gas piping to the gas valve.
2 - When connecting gas supply, factors such as length of run, number of fittings and furnace rating must be considered to avoid excessive pressure drop. TABLE 9 lists recommended pipe sizes for typical applications. NOTE - Use two wrenches when connecting gas piping to avoid transferring torque to the manifold.
3 - Gas piping must not run in or through air ducts, clothes chutes, chimneys or gas vents, dumb waiters or elevator shafts. Center gas line through piping hole. Gas line should not touch side of unit. See FIGURE 58 and FIGURE 59.
4 - Piping should be sloped 1/4 inch per 15 feet (6mm per 5.6m) upward toward the gas meter from the furnace. The piping must be supported at proper intervals, every 8 to 10 feet (2.44 to 3.05m), using suitable hangers or straps. Install a drip leg in vertical pipe runs to serve as a trap for sediment or condensate.
5 - A 1/8" N.P.T. plugged tap or pressure post is located on the gas valve to facilitate test gauge connection. See FIGURE 63

6 - In some localities, codes may require installation of a manual main shut-off valve and union (furnished by installer) external to the unit. Union must be of the ground joint type.
IMPORTANT
Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases.
Leak Check
After gas piping is completed, carefully check all field-installed piping connections for gas leaks. Use a commercially available leak detecting solution specifically manufactured for leak detection. Never use an open flame to test for gas leaks The furnace must be isolated from the gas supply system by closing the individual manual shut-off valve during any gas supply system at pressures greater than or equal to ½ psig. (3.48 kPa, 14 inches w.c.). This furnace and its components are designed, manufactured and independently certified to comply with all applicable ANSI/CSA standards. A leak check of the furnace and its components is not required.
Manual Main Shut-Off Valve Will Not Hold Normal Test Pressure
1/8" N.P.T. Plugged Tap
Isolate Gas Valve Cap
FIGURE 57
IMPORTANT
When testing pressure of gas lines, gas valve must be disconnected and isolated. See FIGURE 57. Gas valves can be damaged if subjected to pressures greater than 1/2 psig (3.48 kPa).
WARNING
FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury, death, or property damage. Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution made specifically for leak detection. Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly after leak test has been completed.

Page 36

Right Side Piping
MANUAL MAIN SHUT-OFF
VALVE
GROUND JOINT UNION
DRIP LEG

Gas Valve

FIELD PROVIDED AND INSTALLED
NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET
FIGURE 58

Horizontal Applications Possible Gas Piping Configurations

Horizontal Application Right-Side Air Discharge

MANUAL MAIN SHUT-OFF
VALVE

Gas Valve

GROUND JOINT UNION
DRIP LEG

Horizontal Application Left-Side Air Discharge

MANUAL MAIN SHUT-OFF
VALVE GROUND
JOINT UNION
DRIP LEG

FIELD PROVIDED AND INSTALLED

Gas Valve
NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET

FIGURE 59

Page 37

TABLE 9

Gas Pipe Capacity - ft3/hr (m3/hr)

Nominal Iron Pipe Size Inches
(mm)

Internal Diameter
inches (mm)

10 (3.048)

20 (6.096)

Length of Pipe - feet (m)

100

(9,144) (12,192) (15.240) (18.288) (21.336) (24.384) (27.432) (30,480)

1/2 (12.7)

.622

172

(17.799) (4.87)

118 (3.34)

95 (2.69)

81 (2.29)

72 (2.03)

65 (1.84)

60 (1.69)

56 (1.58)

52 (1.47)

50 (1.42)

3/4 (19.05)

.824

360

247

199

(20.930) (10.19) (7.000) (5.63)

170 (4.81)

151 (4.23)

137 (3.87)

126 (3.56)

117 (3.31)

110 (3.11)

104 (2.94)

1 (25.4)

1.049

678

466

374

320

(26.645) (19.19) (13.19) (10.59) (9.06)

284 (8.04)

257 (7.27)

237 (6.71)

220 (6.23)

207 (5.86)

195 (5.52)

1-1/4 (31.75)

1.380

1350

957

768

657

583

528

486

452

424

400

(35.052) (38.22) (27.09) (22.25) (18.60) (16.50) (14.95) (13.76) (12.79) (12.00) (11.33)

1-1/2 (38.1)

1.610

2090 1430 1150

985

873

791

728

677

635

600

(40.894) (59.18) (40.49) (32.56) (27.89) (24.72) (22.39) (20.61) (19.17) (17.98) (17.00)

2 (50.8)

2.067

4020

2760

2220

1900

1680

1520

1400

1300

1220

1160

(52.502) (113.83) (78.15) (62.86) (53.80) (47.57) (43.04) (39.64) (36.81) (34.55) (32.844)

2-1/2

2.469

6400

4400

3530

3020

2680

2480

2230

2080

(63.5)

(67.713) (181.22) (124.59) (99.95) (85.51) (75.88) (70.22) (63.14) (58.89)

NOTE - Capacity given in cubic feet (m3 ) of gas per hour and based on 0.60 specific gravity gas.

1950 (55.22)

1840 (52.10)

Removal of the Furnace from Common Vent
In the event that an existing furnace is removed from a venting system commonly run with separate gas appliances, the venting system is likely to be too large to properly vent the remaining attached appliances. Conduct the following test while each appliance is operating and the other appliances (which are not operating) remain connected to the common venting system. If the venting system has been installed improperly, you must correct the system as indicated in the general venting requirements section.
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death. The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:
1 - Seal any unused openings in the common venting system.
2 - Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

3 - Close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
4 - Follow the lighting instructions. Turn on the appliance that is being inspected. Adjust the thermostat so that the appliance operates continuously.
5 - After the main burner has operated for 5 minutes, test for leaks of flue gases at the draft hood relief opening. Use the flame of a match or candle.
6 - After determining that each appliance connected to the common venting system is venting properly, (step 3) return all doors, widows, exhaust fans, fireplace dampers, and any other gas-burning appliances to their previous mode of operation.
7 - If a venting problem is found during any of the preceding tests, the common venting system must be modified to correct the problem.
Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in Appendix G. (These are in the current standards of the National Fuel Gas Code ANSI Z223.1.

Page 38

Electrical
IMPORTANT
When matching this gas furnace with zoning, dual fuel or other 24V accessories, It is recommended to replace the factory installed transformer with kit 27J32. Kit 27J32 contains a 75VA transformer, so you do not overload the original 40VA transformer.
ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic components. Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be properly grounded in accordance with national and local codes.
WARNING
Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury or death. Use copper wire only with this product.
INTERIOR MAKE-UP BOX INSTALLATION
MAKE-UP BOX
Right Side
FIGURE 60 The unit is equipped with a field make-up box. The makeup box may be moved to the right side of the furnace to facilitate installation. Secure the excess wire to the existing harness to protect it from damage. Refer to FIGURE 61 for field wiring, schematic wiring diagram and troubleshooting.

The power supply wiring must meet Class I restrictions. Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate. NOTE - Unit nameplate states maximum current draw. Maximum Over-Current Protection allowed is 15 AMP.
CAUTION
Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring and circuit breaker(s) per Product Specifications bulletin (EHB) and unit rating plate.
Holes are on both sides of the furnace cabinet to facilitate wiring.
Install a separate (properly sized) disconnect switch near the furnace so that power can be turned off for servicing.
Before connecting the thermostat check to make sure the wires will be long enough for servicing at a later date. Make sure that thermostat wire is long enough to facilitate future removal of blower for service.
Complete the wiring connections to the equipment. Use the provided unit wiring diagram and the field wiring diagram shown in FIGURE 61. Use 18-gauge wire or larger that is suitable for Class II rating for thermostat connections.
Electrically ground the unit according to local codes or, in the absence of local codes, according to the current National Electric Code (ANSI/NFPA No. 70) for the USA and current Canadian Electric Code part 1 (CSA standard C22.1) for Canada. A green ground wire is provided in the field make-up box. NOTE - The EL195UHNEK furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded. Generator Use - Voltage Requirements
The following requirements must be kept in mind when specifying a generator for use with this equipment:
· The furnace requires 120 volts + 10% (Range: 108 volts to 132 volts).
· The furnace operates at 60 Hz + 5% (Range: 57 Hz to 63 Hz).
· The furnace integrated control requires both polarity and proper ground. Both polarity and proper grounding should be checked before attempting to operate the furnace on either permanent or temporary power.
· Generator should have a wave form distortion of less than 5% THD (total harmonic distortion).

Page 39

BLOWER SPEED CHART FACTORY CONNECTED SPEED TAPS

G
120V ACC (IF USED)

BURNER

S47
FLAME ROLLOUT SWITCH

FLAME SENSOR

COMBUSTION AIR INDUCER
B6

J84

P84

GV1

IGNITER J159 P159
ON OFF

R33
S18 COMBUSTION AIR PROVING SWITCH

BLACK WHITE GN/YLW
P2
4 321 A92 CONTROL INTEGRATED

N L1
6
HUMIDIFIER
INDOOR EVAPORATOR COIL
LGWP SENSORS

S10 PRIMARY GAS
LIMIT
SEE HUM VIEWS
S51 DOOR INTERLOCK
CB8 CIRCUIT BREAKER

GAS VALVE

5 S145 LOW GAS PRESSURE SWITCH

P1 12 9 6 3

HUM LINE ACC

11 8 5 2

NEUTRALS

10 7 4 1

S1 ROOM THERMOSTAT
YG RCW

T1 TRANSFORMER

12 SW1

SW3

12 SW2

LGWP TEST
DIAGNOSTIC RECALL

LGWP

LGWP SENSORS

P3 RGY O

ALARM

ZONE P8

UNIT 3 040NE36BK 3 060NE36BK
080NE48CK 3 100NE60CK 3
SPEED TAPS

COOL
BLACK BLACK

HEAT YELLOW
BLUE

BLACK BLUE

FAN RED RED
RED

PARK BROWN, BLUE BROWN,YELLOW
BROWN,YELLOW

BLOWER SPEED SELECTION

BLACK BROWN BLUE

YELLOW RED

JACK/PLUG CHART J,P48 JACK/PLUG-INDOOR BLOWER-POWER J,P49 JACK/PLUG-INDOOR BLOWER-SPD TAP
J,P1 JACK/PLUG-BURNER CONTROL J,P84 JACK/PLUG-COMB AIR INDUCER J,P135 JACK/PLUG-SECONDARY LIMIT (S) J,P2 JACK/PLUG-INDUCER/IGNITER J,P159 JACK/PLUG-IGNITION

120VAC

TO N

HUMIDIFIER

TO L1

HUM

AT IFC

NOTE-

IF ANY WIRE IN THIS APPLIANCE IS REPLACED,IT

MUST BE REPLACED WITH WIRE OF LIKE SIZE,

RATING,INSULATION THICKNESS AND TERMINATION.

1 'R' REQUIRED ON SOME OUTDOOR UNITS

2 PARK TERMINALS ARE UNPOWERED TERMINALS. ALL UNUSED MOTOR LEADS MUST BE WIRED TO A PARK TERMINAL.

3 DO NOT USE RED (LOW SPEED) MOTOR LEAD FOR

HEATING SPEED ON 045(X)E36A, 070(X)E36B, 110(X)E60C

AND 135E60D UNITS. RESULTING TEMPERATURE RISE

WILL BE OUTSIDE OF RISE RANGE.

L13

POWER

CHOKE

USED

3 4

AND

ONLY

S1 ROOM THERMOSTAT

5 S145 IS USED WITH HONEYWELL GAS VALVE WHEN APPLIED IN LP GAS UNITS

P49

6 USE COPPER CONDUCTORS ONLY.

AUTO ON

OUTDOOR

P48

UNIT

6 BLACK S51 L1
EQUIPMENT GROUND

LINE

L13 4 POWER CHOKE

B3 INDOOR BLOWER MOTOR

LINE VOLTAGE FIELD INSTALLED CLASS II VOLTAGE FIELD WIRING DENOTES OPTIONAL COMPONENTS
A92

3 TH

THERMOSTAT HEAT ANTICIPATION SETTINGS .65 AMP HONEYWELL VALVE .50 AMP WHITE-RODGERS VALVE
A92 INTEGRATED CONTROL

HEAT COOL FAN

R W1 Y

K1 MV

HL1

HL0

RO2

HEAT COOL FAN HUM24

BLUE J1 P1
PARK PARK PARK

CB8

XFMR

SEE BLOWER SPEED CHART

RO1 BROWN

ORANGE

PURPLE

BLUE

BROWN

YLW BLUE BRN BLK

BLUE 24V J48 P48
RED

120V BLACK

GN/YLW

1 P2

BLACK

P84 J84 1
COMBUSTION AIR INDUCER B6 MOTOR
J84 2 P84

P159 J159 1
J159 2 P159

R33 IGNITOR

HUM

FLAME SENSOR

EAC WHITE/ PINK FS

BLACK CIRC

1 2 3 4 5 J49

P49

T1 WHT/BLK C

BLACK L

4 L13 POWER

GN/YLW G

B3 INDOOR BLOWER MOTOR

S47
S10 GREEN/YELLOW

CHOKE

WHT N

BURNER ASSY GROUND

YELLOW

GND

TR 6

24V COM

A92 INTEGRATED CONTROL

PURPLE YELLOW

MV COM

S145 5 GV1
S18 9 C

WHITE

WHITE J1 P1

3 P2

A92

WHITE

120 V NEUTRALS

HEATING UNITS-GAS
EL195UH040NE36BK EL195UH060NE36BK EL195UH080NE48CK EL195UH100NE60CK
Supersedes

WARNINGELECTRIC SHOCK HAZARD,CAN CAUSE INJURY OR DEATH.UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES.

C 2011

Litho U.S.A.

FIGURE 61

Page 40

IGNITION CONTROL
Integrated Control DIP Switch Settings
EL195UHNEK units are equipped with a single-stage integrated control. This control manages ignition timing, heating mode fan off delays and indoor blower speeds based on selections made using the control dip switches and jumpers. The control includes an internal watchguard feature which automatically resets the ignition control when it has been locked out. After one hour of continuous thermostat demand for heat, the watchguard will break and remake thermostat demand to the furnace and automatically reset the control to relight the furnace.
Accessory Terminals FIGURE 64
One line voltage "ACC" 1/4" spade terminal is provided on the furnace integrated control. This terminal is energized when the indoor blower is operating. Any accessory rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. If an accessory rated at greater than one amp is connected to this terminal, it is necessary to use an external relay.
One line voltage "HUM" 1/4" spade terminal is provided on the furnace integrated control. . This terminal is energized in the heating mode when the combustion air inducer is operating. Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. If a humidifier rated at greater than one amp is connected to this terminal, it is necessary to use an external relay.
One 24V "H" 1/4" spade terminal is provided on the furnace integrated control. The terminal is energized in the heating mode when the combustion air inducer is operating and the pressure switch is closed. Any humidifier rated up to 0.5 amp can be connected to this terminal with the ground leg of the circuit connected to ground or the "C" terminal.

Indoor Blower Operation DIP Switch Settings
The heat fan-on time of 30 seconds is not adjustable The heat fan-off delay (amount of time that the blower operates after the heat demand has been satisfied) may be adjusted by changing the two position dip switch on the integrated control, to one of four selections. Blower off delay is factory set at 120 seconds. For other blower off delay settings, please refer to the following chart:

Blower Delay Select

SW1-1

SW1-2

OFF

120

OFF

180

OFF

210

Factory Setting is 120

ON BOARD LINKS AND DIAGNOSTIC PUSH BUTTON

See FIGURE 62 and FIGURE 63

IMPORTANT
Carefully review all configuration information provided. Failure to properly set DIP switches, jumpers and on-
board links can result in improper operation!

On-Board Link W951 Heat Pump (R to O)
On-board link W951 is a clippable connection between terminals R and O on the integrated control. W951 must be cut when the furnace is installed in applications which include a heat pump unit and a thermostat which features dual fuel use. If the link is left intact, terminal "O" will remain energized eliminating the HEAT MODE in the heat pump.
Diagnostic Push Button
The diagnostic push button is located adjacent to the seven-segment diagnostic LED. This button is used to enable the Error Code Recall "E" mode and the Flame Signal "F" mode. Press the button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. When the button is released, the displayed item will be selected. Once all items in the menu have been displayed, the menu resumes from the beginning until the button is released.

Page 41

Thermostat

On Board Links Must NOT Be Cut To Select AC ON System Options

Wiring Connections

Heat / Cool

S1 T'STAT

FURNACE TERM. STRIP

OUTDOOR UNIT

DO NOT CUT ANY

ON-BOARD LINKS

FIGURE 62

Thermostat
Dual Fuel Single Stage Heat Pump
ComfortSense thermostat w/
bilities

On Board Links Must Be Cut To Select Heat Pump Options

Wiring Connections

T'STAT

FURNACE TERM. STRIP

HEAT PUMP

CUT ON-BOARD LINK W951 HEAT PUMP

67M41*

*Connect W to W ONLY if using defrost tempering kit 67M41 FIGURE 63

Page 42

Single Stage, Constant, Torque, Non-Communicating 107792-01

FIGURE 64

TABLE 10

1/4" QUICK CONNECT TERMINALS

120V HUM

POWER FOR HUMIDIFIER (120 VAC

LINE

INCOMING POWER LINE (120 VAC)

XFMR

TRANSFORMER PRIMARY (120 VAC)

CIRC

INDOOR BLOWER MOTOR (120 VAC)

ACC

ACCESSORY(120 VAC)

24V HUM

HUMIDIFIER (24 VAC)

NEUTRALS

NEUTRAL (5)

3/16" QUICK CONNECT TERMINALS

COOL

COOL SPEED TAP FROM INDOOR BLOWER MOTOR (24 VAC)

HEAT

HEAT SPEED TAP FROM INDOOR BLOWER MOTOR (24 VAC)

FAN

CONTINUOUS FAN SPEED TAP FROM

INDOOR BLOWER MOTOR (24 VAC)

FLAME SENSE FLAME SENSOR ELECTRODE (120 VAC)

COMMON

COMMON (24 VAC)

TWIN

24V TWINNING COMMUNICATION

PARK

3 TERMINALS TO PARK UNUSED MOTOR SPEED TAPS

TABLE 11

THERMOSTAT INPUT TERMINALS

HEAT

COMMON GROUND

24V AC

FAN

COOL

REVERSING VALVE (when W951 is clipped)

LGWP1 LGWP2 ALARM
ZONE
LGWP TEST

TABLE 12
LOW GWP INTERFACE
LOW GWP SENSOR #1 INTERFACE
LOW GWP SENSOR # 2 INTERFACE
INTERFACE TO LOW GWP LEAK AUDIBLE ALARM (DRY CONTACT)
INTERFACE TO ZONING CONTROL (DRY CONTACT)
PUSH BUTTON TO TEST LOW GWP FUNCTIONALITY

Page 43

IGNITION CONTROL DIAGNOSTIC CODES
DIAGNOSTIC CODES / STATUS OF FURNACE IDLE MODE (DECIMAL BLINKS AT 1 HERTZ -- 0.5 SECONDS ON, 0.5 SECONDS OFF INDOOR BLOWER OPERATION: CONTINUOUS FAN MODE (CONSTANT TORQUE ONLY) INDOOR BLOWER OPERATION: FOLLOWED BY CFM SETTING FOR INDOOR BLOWER (1 SECOND ON, 0.5 SECOND OFF) / CFM SETTING FOR MODE DISPLAYED (VARIABLE SPEED ONLY) COOLING STAGE (1 SECOND ON, 0.5 SECOND OFF) 1 OR 2 DISPLAYED / PAUSE / REPEAT CODES. VARIABLE SPEED ONLY GAS HEAT (1 SECOND ON, 0.5 SECOND OFF) PAUSE / CFM DISPLAYED / PAUSE / REPEAT CODES BLINKING - IGNITION HEAT PUMP STAGE (1 SECOND ON, 0.5 SECOND OFF) 1 OR 2 DISPLAYED / PAUSE / CFM SETTING DISPLAYED / PAUSE / REPEAT CODES DEFROST MODE
ERROR/FAULT CONDITION NO ERROR IN THE MEMORY ELECTRICAL FAULTS (WAIT FOR RECOVERY) AC LINE VOLTAGE LOW TWIN COMMUNICATION FAULT (CONSTANT TORQUE ONLY) LINE VOLTAGE POLARITY REVERSED AC LINE VOLTAGE HIGH HARDWARE FAULT (5 MINUTES LOCKOUT) CONTROL HARDWARE (INCLUDE A/D ELECTRONICS AND FLAME TEST) FAILURE HARD LOCKOUT FAULT ROLLOUT OPEN OR PREVIOUSLY OPENED GAS VALVE/PRESSURE SWITCH/LIMIT FAULTS (wait for recovery) GAS VALVE RELAY (1ST OR 2ND STAGE) PROBLEM LOW PRESSURE SW FAILED TO CLOSE (STUCK OPEN) LOW PRESSURE SW FAILED TO OPEN (STUCK CLOSED) LOW PRESSURE SWITCH OPENED IN RUN OR TFI FLAME SENSE OUT OF SEQUENCE-STILL PRESENT PRIMARY LIMIT SWITCH OPENED

CODE .
A
C
H
h
dF CODE E000
E110 E106 E111 E113
E125
E200
E204 E223 E224 E227 E241 E250

Page 44

IGNITION CONTROL DIAGNOSTIC CODES (CONTINUED)

SOFT LOCKOUT FAULTS (60 MINUTES)

SOFT LOCKOUT-FLAME FAILURE ON IGNITION, IGNITION RETRY>MAX, LAST FAILED RETRY DUE TO FLAME FAILURE

E270

SOFT LOCKOUT-PRESSURE SWITCH OPEN, IGNITION RETRY>MAX, LAST FAILED RETRY DUE TO LPSW OPEN

E271

SOFT LOCKOUT-PRESSURE SWITCH OPEN, IN RUN MODE HEATING RECYCLES>MAX, LAST FAILED RETRY DUE TO LPSW OPEN

E272

SOFT LOCKOUT-FLAME FAILURE IN RUN MODE,HEATING RECYCLES>MAX, LAST FAILED RETRY DUE TO LOSS OF FLAME

E273

SOFT LOCKOUT-LIMIT OPEN > 3 MINUTES

E274

SOFT LOCKOUT-FLAME OUT OF SEQUENCE AND IS GONE

E275

PERFORMANCE WARNING

POOR GROUND DETECTED

E117

LOW FLAME CURRENT IN HEATING MODE

E240

INDOOR BLOWER UNABLE TO START (VARIABLE SPEED ONLY)

E292

LOW GWP REFRIGERANT FAULTS

REFRIGERANT LEAK DETECTED, THERMOSTAT LOCKOUT

E150

REFRIGERANT LEAK DETECTOR SENSOR #1 FAULT

E151

REFRIGERANT LEAK DETECTOR SENSOR #2 FAULT

E152

REFRIGERANT LEAK DETECTOR SENSOR #1 COMM. LOST

E154

REFRIGERANT LEAK DETECTOR SENSOR #2 COMM. LOST

E155

REFRIGERANT LEAK DETECTOR SENSOR #1 TYPE INCORRECT

E160

REFRIGERANT LEAK DETECTOR SENSOR #2 TYPE INCORRECT

E161

REFRIGERANT LEAK DETECTOR CONTROL FAILURE

E163

LOW GWP TEST

E164

LOW GWP RELAY STUCK

E390

Indoor Blower Speeds

1 - When the thermostat is set to "FAN ON," the indoor blower will run continuously on the fan speed when there is no cooling or heating demand. See table below for allowable circulation speeds.
2 - When the EL195UHNEK is running in the heating mode, the indoor blower will run on the heating speed. See table below for allowable heating speeds.
3 - When there is a cooling demand, the indoor blower will run on the cooling speed.

Model Number All Models

Red Factory Setting

TABLE 13

Allowable Circulation Speeds

Yellow

Blue

Not Allowed

Brown Not Allowed

Black Not Allowed

EL195UHNEK Model Number
040NE36BK
060NE36BK 080NE60CK 100NE60CK

Red Allowed

TABLE 14 Allowable Heating Speeds

Yellow

Blue

Factory Setting

Allowed

Factory Setting

Brown Not Allowed
Allowed Not Allowed

Black Not Allowed

Page 45

Twinning Two EL195UHNEK Furnaces
The control board in this furnace is equipped with a provision to "twin" (interconnect) two(2) adjacent furnaces with a common plenum such that they operate as one (1) large unit.
When twinned, the circulating blower speeds are synchronized between the furnaces. If either furnace has a need to run the blower, both furnaces will run the blower on the same speed. The cooling speed has highest priority, followed by heating speed and fan speed.
Field installation of twinning consists of connecting wires between the "C", "O" and "Twin" terminals of the two controls.

The 24 VAC secondary of the two systems must be in phase. All thermostat connections are made to one control only. See diagram below.
The twinned furnace without thermostat connections is to have the call for heat supplied by an external 24VAC isolation relay* to prevent its rollout switch from being bypassed by the other twinned furnace. The coil of the isolation relay connects from the thermostat "W" to 24 VAC common. The contacts of the relay connect "R" to "W" on the non-thermostat twin.
*Wiring and quick connects will be field provided

Page 46

Low GWP Application
WARNING
For use with Lennox approved evaporator coil and LGWP sensors only. Use original manufacturer recommended LGWP sensors if using non Lennox approved evaporator coil. CONNECTING THE FURNACE CONTROL BOARD SENSOR. See FIGURE 67 and follow steps below:
1 - Route sensor wire #1 through provided grommet. Form a drip loop below the control board on upflow installations to prevent condensate dripping on the control board.
2 - Avoid sharp edges when routing sensor wire during installation.
3 - Sensor wire must not block view of 7 segment LED . Ensure the cable is properly seated into the SENSOR 1 plug (LGWP1). The Molex plug clip should lock into the Molex connection point for a secured connection, as shown below in FIGURE 65. Verify the connection is free of dust, debris, and moisture. NonOdTEse-nsInorcotonfitnheedSsEpNacSeOaRpp2licpalutiogn(sL,GcWonPn2e)c.t Rtheefesretcoevaporator coil installation instructions for more detail.
Single Stage Constant Torque Control
FIGURE 65
LOW GWP DIP SWITCH SETTINGS Adjust the DIP switch settings to the sensor configuration. Failure to do so will cause faults on power-up. See FIGURE 66 and TABLE 15

FIGURE 66

TABLE 15

DIP Switch Settings

Configuration

Switch 1 Switch 2

One (1) sensor, connected to SEN- OFF

SOR 1 plug

(enable)

ON (disable)

Two (2) sensors, connected to SEN- OFF

SOR 1 plug and SENSOR 2 plug

(enable)

OFF (enable)

No sensor R410A or heat only applications

(Disabled) (Disabled)

In single sensor configurations, the sensor must be connected to the SENSOR 1 plug (LGWP1). Configurations other than the ones shown in TABLE 15 will cause a ser-
vicing fault.

Each DIP switch corresponds to a sensor position (i.e., DIP switch 1 to sensor 1; DIP switch 2 to sensor 2). The default factory switch positions are set to OFF (ENABLED)

The furnace control board software reads the OFF position as an active sensor. A sensor should be present for the corresponding sensor connector. Setting the DIP switch to ON disables the sensor position.

SECONDARY SENSOR REQUIREMENTS

Additional Line Sets

If additional refrigerant line joints are present outside of the line set sleeve and a secondary refrigerant detection sensor is required, its installation must comply with the requirements listed in Refrigerant Detection Sensor Kit (27V53). See FIGURE 67 for routing the secondary sensor cable through the furnace cabinet.

Non-Low GWP Applications
WARNING
For Furnace only applications or Furnace replacement in a Non-Low GWP applications, the LOW GWP sensors should be disabled, otherwise the blower will operate continuously. To do this, the Low GWP Dip switches setting for both Sensor 1 and the Sensor 2 must be moved to the ON position.

Page 47

FURNACE CONTROL BOARD LOW GWP MODES OF OPERATION
The modes of operation for the furnace control board are Initializing, Normal, Leak Detected, and Fault.
Initializing The furnace control board is establishing connection with the refrigerant detection sensor and is completing an initial five-minute purge sequence.
Normal The HVAC system is functioning normally. The furnace control board has not detected a refrigerant leak.
Leak Detected When the furnace control board detects a refrigerant leak:
1. The furnace control board shuts off the (R) input (24VAC power) to the thermostat, which deenergizes the outdoor unit compressor and heat sources, such as gas and/or electric strip heat. No heating or cooling demands will be met.

2. The furnace control board activates the blower (high speed). The blower purges refrigerant from the cabinet, plenum, and ductwork.
3. After the furnace control board determines the refrigerant levels are below the safety threshold, the blower will continue to operate for the remainder of the seven (7) -minute cycle.
4. After the blower sequence is complete, the HVAC system resumes normal operation.
NOTE - The HVAC system may not maintain a cooling or heating setpoint if a significant leak exists. Any refrigerant leaks that remain unaddressed for an extended time may cause the HVAC system to shut down on a low refrigerant pressure limit condition.
Fault When a Low GWP fault is detected by the furnace control board, the indoor unit blower engages and remains engaged at a constant air flow output until the fault is cleared. NOTE - See IGNITION CONTROL DIAGNOSTIC CODES on page 45

UP FLOW

SENSOR #1 CABLE TO
EVAP. COIL

CABLE TO SENSOR #1
THROUGH GROMMET

7 SEGMENT LED
WIRE TIE
LOW GWP SENSOR #2

DRIP LOOP

EVAPORATOR COIL

HORIZONTAL LEFT
EVAPORATOR COIL

FURNACE CONTROL

LOW GWP SENSOR #1

FURNACE CONTROL
SECOND SENSOR THROUGH RIGHT SIDE GROMMET HOLE

SENSOR #1 CABLE TO
EVAP. COIL

CABLE TO SENSOR #2 (WHEN REQUIRED)
LOW GWP SENSOR #1

7 SEGMENT LED

CABLE TO SENSOR #1

LOW GWP SENSOR #2
WIRE TIE
7 SEGMENT LED THROUGH GROMMET

HORIZONTAL RIGHT
FURNACE CONTROL

EVAPORATOR COIL

LOW GWP SENSOR #1

THROUGH GROMMET

CABLE TO SENSOR #1

FIGURE 67

SENSOR CABLE TO EVAP. COIL

Page 48

LGWP TEST BUTTON FUNCTIONALITY
The furnace control board is equipped with a Test/Reset push button. The Test button can be used to perform several functions, depending on the mode of operation of the furnace control board. TABLE 16 lists the functions of the Test button during each mode of operation.

TABLE 16

LGWP Test Button Function

Mode of Operation

Press the Test Button to:

Normal

Trigger a leak detection response. Verify all equipment is wired correctly into the furnace blower control board (after installation).

Leak Detected

Reset the furnace control board to a normal mode of operation after a previous leak has been detected and purged from the HVAC system

Fault

Reset the furnace control board after troubleshooting and resolving a fault condition. If the fault is not resolved, the furnace control board will enter the Fault mode again.

LGWP Test Button - Additional Functions

TABLE 14 lists the additional functions of the Test Button
while the furnace control board is functioning within the states of Initializing, Monitoring, Leak Detection, Servicing and Fault.

State Initializing
Initializing Monitoring Monitoring Mitigating Servicing
Servicing Fault
Fault

TABLE 17

Additional Button Functions

Press

Action

Short

Skips remaining pre-purge after sensors are recognized by the furnace control board

Long Reset control

Short Clear purge-counter if prior mitigation has occurred; Test mitigation

Long Reset control

Short If testing mitigation, end test

Short

Reevaluate fault condition - if cleared return to monitoring, otherwise update indicator

Long Reset control

Short

Reevaluate fault condition - if cleared return to monitoring, otherwise update indicator

Long Reset control

External Alarm (For applications with external alarms wired directly to the furnace control board) The furnace control board triggers the external alarm system when it enters Leak Detected mode. For alarm notifications, the furnace control board provides a dry relay contact that is rated 3A at 30 VAC/DC. THERMOSTAT COMPATIBILITY
Thermostats that preserve memory settings are compatible with the furnace control board. Examples include:
· Battery-powered thermostats
· Analog Thermostat
· Late-model programmable thermostats NOTE - Early-generation digital and programmable thermostats may not retain the operation mode and temperature setpoints after a power outage. The following scenarios are likely to occur when home occupants are not available to adjust the thermostat setpoints as the system is recovering from leak detection and resuming normal operation:
· Heating could be lost during a cold night
· Cooling could be lost during a hot day
· The thermostat could reset to an incorrect temperature setpoint
START UP PROCEDURE
The furnace control board is equipped with a LGWP Test/ Reset button, see Test Button Functionality. After the furnace control board has been mounted and wired, restore power to the HVAC system. The system will then run through a purge sequence for five minutes. After the purge sequence is complete, proceed to testing cooling demand and heating demand.
Cooling Demand
1. Prompt a cooling demand at the thermostat.
2. Press the LGWP Test button on the furnace control board.
The system then executes a leak detection response.
3. Observe the following sequence:
a. The LED indicator for leak detection. See . b. The blower powers up. c. The outdoor compressor powers down. 4. Press the LGWP Test button to terminate the
simulated Leak Detected mode upon test completion
5. Heating Demand
1. Prompt a heating demand at the thermostat.
2. Observe the following sequence:
a. The LED indicator for leak detection. See IGNITION CONTROL DIAGNOSTIC CODES on page 45.
b. The blower powers up. c. The gas burners power down. d. The outdoor compressor powers down. 3. Press the LGWP Test button to terminate the
simulated Leak Detected mode upon test completion.
The installation of the furnace control board is complete after both sequences are successfully completed.

Page 49

Unit Start Up
Priming Condensate Trap
The condensate trap should be primed with water prior to start-up to ensure proper condensate drainage. Either pour 10 fl. oz. (300 ml) of water into the trap, or follow these steps to prime the trap:
1 - Follow the lighting instructions to place the unit into operation.
2 - Set the thermostat to initiate a heating demand.
3 - Allow the burners to fire for approximately 3 minutes.
4 - Adjust the thermostat to deactivate the heating demand.
5 - Wait for the combustion air inducer to stop. Set the thermostat to initiate a heating demand and again allow the burners to fire for approximately 3 minutes.
6 - Adjust the thermostat to deactivate the heating demand and wait for the combustion air inducer to stop. At this point, the trap should be primed with sufficient water to ensure proper condensate drain operation.
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
Do not use this furnace if any part has been underwater. A flood-damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. Immediately call a qualified service technician to inspect the furnace and to replace all gas controls, control system parts, and electrical parts that have been wet or to replace the furnace, if deemed necessary.
WARNING
Danger of explosion. Can cause injury or product or property damage. If overheating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off electrical supply.
BEFORE LIGHTING the unit, smell all around the furnace area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. The gas valve on the EL195UHNEK is equipped with a gas control switch (lever). Use only your hand to move switch. Never use tools. If the switch will not move by hand, do not try to repair it. Force or attempted repair may result in a fire or explosion. Placing the furnace into operation:
EL195UHNEK units are equipped with an automatic hot surface ignition system. Do not attempt to manually light burners on this furnace. Each time the thermostat calls for heat, the burners will automatically light. The ignitor does not get hot when there is no call for heat on these units.

WARNING
If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal
injury or death.

Gas Valve Operation (FIGURE 68)
1 - STOP! Read the safety information at the beginning of this section.
2 - Set the thermostat to the lowest setting.
3 - Turn off all electrical power to the unit. 4 - This furnace is equipped with an ignition device
which automatically lights the burners. Do not try to light the burners by hand.
5 - Remove the access panel.
6 - Move gas valve switch to OFF. See FIGURE 68.
7 - Wait five minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. If you do not smell gas go to next step.
8 - Move gas valve switch to ON. See FIGURE 68.

NEGATIVE AIR

GAS VALVE
POSITIVE AIR

PRESSURE PORT

INLET

OUTLET

SUPPLY PRESSURE

MANIFOLD PRESSURE TAP

TAP

GAS VALVE SHOWN IN THE ON POSITION

FIGURE 68
9 - Replace the access panel.
10- Turn on all electrical power to the unit.
11- Set the thermostat to desired setting. NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.
12- If the appliance will not operate, follow the instructions "Turning Off Gas to Unit" and call your service technician or gas supplier.
9 - Replace the access panel.
10- Turn on all electrical power to the unit.
11- Set the thermostat to desired setting. NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.
12- If the appliance will not operate, follow the instructions "Turning Off Gas to Unit" and call your service technician or gas supplier.

Page 50

Turning Off Gas to Unit
1 - Set the thermostat to the lowest setting. 2 - Turn off all electrical power to the unit if service is to
be performed. 3 - Remove the access panel. 4 - Move gas valve switch to OFF. 5 - Replace the access panel.
Failure To Operate
If the unit fails to operate, check the following: 1 - Is the thermostat calling for heat? 2 - Are access panels securely in place? 3 - Is the main disconnect switch closed? 4 - Is there a blown fuse or tripped breaker? 5 - Is the filter dirty or plugged? Dirty or plugged filters will cause the limit control to shut the unit off. 6 - Is gas turned on at the meter? 7 - Is the manual main shut-off valve open? 8 - Is the internal manual shut-off valve open? 9 - Is the unit ignition system in lockout? If the unit locks out again, inspect the unit for blockages.

Heating Sequence Of Operation
1 - When thermostat calls for heat, combustion air inducer starts.
2 - Combustion air pressure switch proves blower operation. Switch is factory set and requires no adjustment.
3 - After a 15-second prepurge, the hot surface ignitor energizes.
4 - After a 20-second ignitor warm-up period, the gas valve solenoid opens. A 4-second trial for ignition period begins."
5 - Gas is ignited, flame sensor proves the flame, and the combustion process continues.
6 - If flame is not detected after first ignition trial, the ignition control will repeat steps 3 and 4 four more times before locking out the gas valve ("WATCHGUARD" flame failure mode). The ignition control will then automatically repeat steps 1 through 6 after 60 minutes. To interrupt the 60-minute "WATCHGUARD" period, move thermostat from "Heat" to "OFF" then back to "Heat". Heating sequence then restarts at step 1.

Page 51

Gas Pressure Adjustment Gas Flow (Approximate)

TABLE 18

GAS METER CLOCKING CHART

Seconds For One Revolution

EL195E Model

Natural

1 cu ft Dial

2 cu ft Dial

LP/Propanae

1 cu ft 2 cu ft

Dial

-040

180

n/a

-060

120

150

300

-080

112

224

-100

n/a

Natural-1000 btu/cu ft / Propane 2500 btu/cu ft
Furnace should operate at least 5 minutes before checking gas flow. Determine time in seconds for two revolutions of gas through the meter. (Two revolutions assures a more accurate time.) Divide by two and compare to time in TABLE 18. If manifold pressure matches TABLE 19 and rate is incorrect, check gas orifices for proper size and restriction. Remove temporary gas meter if installed.
NOTE - To obtain accurate reading, shut off all other gas appliances connected to meter.

Supply Pressure Measurement

A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap. Remove the threaded plug, install a field-provided barbed fitting and connect a manometer to measure supply pressure.
On multiple unit installations, each unit should be checked separately, with and without units operating. Supply pressure must fall within range listed in TABLE 19.
Check Manifold Pressure

To correctly measure manifold pressure, follow the steps below
1 - Remove the threaded plug from the outlet side of the gas valve and install a field-provided barbed fitting. Connect measuring device "+" connection to barbed fitting to measure manifold pressure.
2 - Start unit and allow 5 minutes for unit to reach steady state.
3 -After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in TABLE 19.

IMPORTANT
DO NOT ADJUST GAS VALVE
See unit service manual for troubleshooting if manifold pressure and combustion sample do not meet specification.

4 - Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.
5 - Start unit and perform leak check. Seal leaks if found.
IMPORTANT
For safety, connect a shut-off valve between the manometer and the gas tap to permit shut off of gas pressure to the manometer.

TABLE 19

Manifold and Supply Pressure and LP Conversion Kit

Nat

Altiude Unit LP Kit Manifold Supply Manifold Supply

in wc in wc in wc in wc

-040 n/a

n/a

-060 19K05

0-4500ft

3.5

-080 19K06

3.6

11.013.0

-100 n/a

4.5-

n/a

-040 n/a

3.2

10.5

n/a

4501- -060 19K05

2.3

7500ft -080 19K06

2.4

2.5

11.0-

2.8

13.0

-100 n/a

2.3

n/a

Proper Combustion
Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking combustion. Take combustion sample beyond the flue outlet and compare to the table below.

TABLE 20

Unit

CO2% For Nat

040

6.3 - 7.8

CO2% For LP n/a

060

6.5 - 8.2

8.4 - 9.9

080

7.2 - 8.4

9.0 - 10.4

100

7.3 - 8.5

n/a

The maximum carbon monoxide reading should not exceed 100ppm.

High Altitude Information
Units may be installed at altitudes up to 7,500 ft. above sea level. See TABLE 19 for de-rate manifold values.

Page 52

Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications
WARNING
CARBON MONOXIDE POISONING HAZARD!
Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.
The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation.
After the EL195UHNEK gas furnace has been started, the following test should be conducted to ensure proper venting and sufficient combustion air has been provided to the EL195UHNEK as well as to other gas-fired appliances which are separately vented.
If a EL195UHNEK furnace replaces a Category I furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the heat of the original furnace flue products, the existing vent pipe is probably oversized for the single water heater or other appliance. The vent should be checked for proper draw with the remaining appliance.
The test should be conducted while all appliances (both in operation and those not in operation) are connected to the venting system being tested. If the venting system has been installed improperly, or if provisions have not been made for sufficient amounts of combustion air, corrections must be made as outlined in the previous section.

1 - Seal any unused openings in the venting system.
2 - Visually inspect the venting system for proper size and horizontal pitch. Determine there is no blockage or restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.
3 - To the extent that it is practical, close all building doors and windows and all doors between the space in which the appliances connected to the venting system are located and other spaces of the building.
4 - Close fireplace dampers.
5 - Turn on clothes dryers and any appliances not connected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan.
6 - Follow the lighting instruction to place the appliance being inspected into operation. Adjust thermostat so appliance will operate continuously.7 - Use the flame of match or candle to test for spillage of flue gases at the draft hood relief opening after 5 minutes of main burner operation.
8 - If improper venting is observed during any of the above tests, the venting system must be corrected or sufficient combustion/make-up air must be provided. The venting system should be re-sized to approach the minimum size as determined by using the appropriate tables in appendix G in the current standards of the National Fuel Gas Code ANSI-Z223.1/NPFA 54 in the U.S.A., and the appropriate Natural Gas and Propane appliances venting sizing tables in the current standard of the CSA-B149 Natural Gas and Propane Installation Codes in Canada.
9 - After determining that each appliance remaining connected to the common venting system properly vents when tested as indicated in step 3, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their previous condition of use.

Page 53

Other Unit Adjustments
Primary Limit.
The primary limit is located on the heating compartment vestibule panel. This limit is factory set and requires no adjustment.
Rollout Switch
This auto-reset switch is located on the front of the intake air elbow.
Pressure Switch
The pressure switch is located in the heating compartment on the cold end header box. This switch checks for proper combustion air inducer operation before allowing ignition trial. The switch is factory-set and must not be adjusted.
Temperature Rise
After the furnace has been started and supply and return air temperatures have been allowed to stabilize, check the temperature rise. If necessary, adjust the blower speed to maintain the temperature rise within the range shown on the unit nameplate. See TABLE 14 for allowable heating speeds. Increase the blower speed to decrease. The temperature. Decrease the blower speed to increase the temperature rise. Failure to adjust the temperature rise may cause erratic limit operation.
Electrical
1 - Check all wiring for loose connections.
2 - Check for the correct voltage at the furnace operating). Correct voltage is 120VAC + 10%
3 - Check amp-draw on the blower motor with blower access panel in place.
Unit Nameplate__________Actual__________

Blower Speeds
Follow the steps below to change the blower speeds. 1 - Turn off electrical power to furnace. 2 - Remove blower access panel.
3 - Disconnect existing speed tap at integrated control speed terminal.
Blower Speeds
Follow the steps below to change the blower speeds. 1 - Turn off electrical power to furnace. 2 - Remove blower access panel.
3 - Disconnect existing speed tap at integrated control speed terminal. NOTE - Termination of any unused motor leads must be insulated.
4 - Place unused blower speed tap on integrated control "PARK" terminal or insulate.
5 - Refer to blower speed selection chart on unit wiring diagram for desired heating or cooling speed. See Product Specifications Bulletin for blower performance data. See TABLE 14 for allowable heating speeds.
6 - Connect selected speed tap at integrated control speed terminal.
7 - Resecure blower access panel.
8 - Turn on electrical power to furnace.
9 - Recheck temperature rise.
Electronic Ignition
The integrated control has an added feature of an internal Watchguard control. The feature serves as an automatic reset device for integrated control lockout caused by ignition failure. This type of lockout is usually due to low gas line pressure. After one hour of continuous thermostat demand for heat, the Watchguard will break and remake thermostat demand to the furnace and automatically reset the integrated control to begin the ignition sequence.

Page 54

Service
WARNING
ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace. When servicing controls, label all wires prior to disconnecting. Take care to reconnect wires correctly. Verify proper operation after servicing.
WARNING
The blower access panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.
Annual Furnace Maintenance
At the beginning of each heating season, and to comply with the Lennox Limited Warranty, your system should be checked as follows: NOTE - Burner inspection and service is not recommended for annual furnace maintenance.
1 - Check wiring for loose connections, voltage at indoor unit and amperage of indoor motor.
2- Inspect all gas pipe and connections for leaks.
3- Check the cleanliness of filters and change if necessary (monthly).
4- Check the cleanliness of blower assembly and clean the housing, blower wheel and blower motor if necessary .
5- Inspect the condensate drain and trap for leaks and cracks. Check any additional traps such as in the crawl space exhaust. The drain and trap must also be cleaned and the trap must be primed with water.
6- Remove the rubber hoses from the cold end header box and inspect for any blockage, clean as needed. If strainers are installed in the hoses remember to remove and clean before reinstalling the hoses.
7- Evaluate the heat exchanger and combustion chamber integrity by inspecting the heat exchanger per the AHRI heat exchanger inspection procedure. This can be viewed at www.ahrinet.org. See "Induceddraft Furnace Heat Exchanger Inspection Procedure.
8- Ensure sufficient combustion air is available to the furnace. Fresh air grilles and louvers (on unit and in the room where the furnace is installed) must be properly sized, open and unobstructed to provide combustion air.
.

9 - Inspect the furnace intake and exhaust pipes to make sure they are in place, structurally sound, without holes, blockage or leakage and the exhaust pipe is sloped toward the furnace. Inspect terminations to ensure they are free of obstructions and are structurally sound. If applicable, inspect and clean air intake screen. Inspect the furnace return air duct connection to ensure the duct is sealed to the furnace.
10- Inspect the furnace return air duct connection to ensure the duct is sealed to the furnace. Check for air leaks on supply and return ducts and seal where necessary.
11- Check the condition of the furnace cabinet insulation and repair if necessary.
12- Perform a complete combustion analysis during the furnace inspection to ensure proper combustion and operation. Consult Service Literature for proper combustion values.
13- Verify operation of smoke detectors and CO detectors and replace batteries as required.
14 -Inspect the Low GWP sensor / sensors and rubber sleeve.
Perform a general system test. Turn on the furnace to check operating functions such as the start-up and shutoff operation.
1 - Check the operation of the ignition system, inspect and clean flame sensor. Check microamps before and after. Check controls and safety devices (gas valve, flame sensor, temperature limits). Consult Service Manual for proper operating range. Thermal Limits should be checked by restricting airflow and not disconnecting the indoor blower. For additional details, please see Service and Application Note H049.
2 - Verify that system total static pressure and airflow settings are within specific operating parameters.
3 - Clock gas meter to ensure that the unit is operating at the specified firing rate. Check the supply pressure and the manifold pressure. If manifold pressure adjustment is necessary, consult the Service Literature for unit specific information on adjusting gas pressure. Not all gas valves are adjustable. Verify correct temperature rise.
Winterizing and Condensate Trap Care
1 - Turn off power to the furnace.
2 - Have a shallow pan ready to empty condensate water.
3 - Remove the clean out cap from the condensate trap and empty water. Inspect the trap then reinstall the clean out cap.

Page 55

Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA nameplate -- Example: EL195UH040NE36BK-01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier. Cabinet Parts
Outer access panel Blower access panel Top Cap Control Panel Parts
Transformer Integrated control board Door interlock switch

Blower Parts
Blower wheel Motor Motor mounting frame Blower housing cutoff plate Heating Parts
Flame Sensor Heat exchanger assembly Gas manifold Assembly Combustion air inducer Gas valve Burner assembly Pressure switch Ignitor Primary limit control Rollout switch Refrigerant Detection System Parts Refrigerant Detection Sensor Refrigerant Line Set Sleeve

Page 56

Start-Up & Performance Check List

2 2

UNIT SET UP (typical)
Furnace: Model Number_______________
Serial Number_________________
Line Voltage

SUPPLY AIR

1 GAS SUPPLY

Natural Gas LP Propane Gas

Piping Connections Tight

Leak Tested

Supply Line Pressure "W.C.________

1 Gas Supply Pressure
1

3
Flter RETURN AIR

2 INTAKE / EXHAUST PIPE All Joints Primed and Glued Terminations Installed Properly Horizontal Pipes Sloped (if applicable) Condensate Trap Primed / Line Sloped Pipes Supported Heat Cable Installed and Operable (if applicable)

3 DUCT SYSTEM SUPPLY AIR DUCT Sealed
Insulated (if necessary)
RETURN DUCT Sealed
Filter Installed and Clean
Grilles Unobstructed 4 VOLTAGE CHECK
Supply Voltage _____

Page 57

HEATING MODE

UNIT OPERATION

1 GAS MANIFOLD PRESSURE "W.C._____

COOLING MODE 3 INDOOR BLOWER AMPS______

2 COMBUSTION SAMPLE CO2%______CO PPM_______
3 INDOOR BLOWER AMPS______
4 TEMPERATURE RISE Supply Duct Temperature ________ Return Duct Temperature _ _____ Temperature Rise = ________
5 TOTAL EXTERNAL STATIC Supply External Static _______ Return External Static + ______ Total External Static = _______
6 CONDENSATE LINE Leak Free
7 VENT PIPE Leak Free Combustion CO2

4 TEMPERATURE DROP Return Duct Temperature _________ Supply Duct Temperature _ _______ Temperature Drop = _________
5 TOTAL EXTERNAL STATIC (dry coil) Supply External Static _______ Return External Static + ______ Total External Static = _______
8 DRAIN LINE Leak Free
9 THERMOSTAT Adjusted and Programmed Explained Operation to Owner

SUPPLY AIR

9 Blower Motor Amps
3

Thermostat 6

8 Gas Manifold Pressure 1

Temperatures
4

Duct Static High + 5
RETURN AIR
Low -

Contractor's: Name_________________________Telephone_____________Checklist Completed____________________ Job Address_____-________________________________Technician's Name___________________________________

Page 58

BLOWER DATA

EL195UH040NE36BK PERFORMANCE (Less Filter)

External Static
Pressure in. w.g.

High (Black)

cfm

Watts

Air Volume / Watts at Various Blower Speeds

Medium-High (Brown)

Medium (Blue)

Medium-Low (Yellow)

cfm

Watts

cfm

Watts

cfm

Watts

0.10

1413

358

1257

255

1155

202

914

114

0.20

1385

366

1231

267

1124

214

875

120

0.30

1354

383

1199

277

1091

223

832

130

0.40

1336

396

1171

289

1062

232

791

137

0.50

1280

392

1140

301

1019

244

751

148

0.60

1211

375

1111

307

985

254

702

158

0.70

1129

351

1071

323

959

263

658

163

0.80

1009

319

996

309

917

275

613

172

0.90

846

273

858

273

812

259

575

178

1.00

730

246

719

245

702

236

530

185

Low (Red)

cfm

Watts

871

820

106

776

114

740

124

684

131

642

140

589

147

555

151

509

158

466

166

EL195UH060NE36BK PERFORMANCE (Less Filter)

External Static
Pressure in. w.g.

High (Black)

cfm

Watts

Air Volume / Watts at Various Blower Speeds

Medium-High (Brown)

Medium (Blue)

Medium-Low (Yellow)

cfm

Watts

cfm

Watts

cfm

Watts

0.10

1416

339

1253

249

1145

194

904

109

0.20

1395

351

1223

258

1118

205

865

118

0.30

1369

364

1198

270

1083

212

830

127

0.40

1342

377

1169

279

1055

222

793

134

0.50

1321

384

1141

289

1024

230

756

143

0.60

1292

396

1117

300

996

242

718

151

0.70

1246

395

1091

307

965

251

673

157

0.80

1179

376

1065

316

934

262

635

164

0.90

1082

349

1020

323

906

267

594

171

1.00

975

318

927

300

875

275

565

177

Low (Red)

cfm

Watts

856

812

103

777

111

744

117

698

126

664

133

615

142

576

147

533

155

504

161

Page 59

BLOWER DATA

EL195UH080NE48CK PERFORMANCE (Less Filter)

External Static
Pressure in. w.g.

High (Black)

cfm

Watts

Air Volume / Watts at Various Blower Speeds

Medium-High (Brown)

Medium (Blue)

Medium-Low (Yellow)

cfm

Watts

cfm

Watts

cfm

Watts

0.10

1651

400

1441

286

1314

225

1236

189

0.20

1622

414

1419

303

1286

241

1201

204

0.30

1603

433

1386

316

1253

254

1163

217

0.40

1581

452

1355

331

1222

265

1122

229

0.50

1548

467

1322

347

1182

278

1094

240

0.60

1522

479

1293

358

1157

290

1053

252

0.70

1441

465

1258

371

1104

304

1011

264

0.80

1341

435

1211

382

1083

312

984

271

0.90

1228

403

1159

372

1037

324

938

281

1.00

1132

377

1034

342

987

323

913

291

Low (Red)

cfm

Watts

1114

151

1077

160

1038

174

996

184

948

193

908

203

876

212

827

222

799

230

769

239

EL195UH100NE60CK PERFORMANCE (Less Filter)

Air Volume / Watts at Different Blower Speeds

Bottom Return Air, Side Return Air with Return Air from External Both Sides or Return Air from Bottom and One Side.
Static

Pressure in. w.g.

High (Black)

MediumHigh (Brown)

Medium (Blue)

MediumLow
(Yellow)

Low (Red)

Single Side Return Air - Air volumes in bold (over 1800 cfm) require Optional Return Air Base and field fabricated transition to accommodate 20 x 25 x 1 in. air
filter in order to maintain proper air velocity.

High (Black)

MediumHigh (Brown)

Medium (Blue)

MediumLow
(Yellow)

Low (Red)

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

0.10 2064 683 1822 466 1662 363 1559 306 1387 222 2045 678 1837 466 1648 366 1527 300 1358 218

0.20 2034 700 1793 480 1621 379 1520 318 1337 233 2009 698 1765 482 1611 377 1489 315 1313 228

0.30 1997 715 1750 497 1587 390 1479 330 1297 244 1981 713 1737 497 1574 391 1448 327 1270 240

0.40 1967 730 1719 513 1548 402 1447 341 1254 254 1954 729 1701 508 1535 402 1419 337 1224 251

0.50 1940 739 1682 525 1514 415 1400 354 1205 266 1915 740 1663 522 1501 414 1378 349 1186 261

0.60 1867 729 1649 537 1469 428 1362 364 1162 275 1859 731 1625 538 1457 428 1338 360 1139 273

0.70 1794 701 1615 552 1441 436 1326 375 1125 285 1787 706 1596 550 1418 438 1298 367 1090 284

0.80 1706 668 1581 567 1399 451 1280 387 1077 295 1697 674 1553 565 1383 452 1262 383 1065 288

0.90 1596 624 1532 574 1366 463 1249 397 1039 301 1604 635 1524 572 1344 463 1223 395 1017 302

1.00 1490 584 1455 554 1329 474 1210 407 993 312 1482 586 1444 552 1318 475 1183 406 973 310

Page 60

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	Lennox EL180UHNE(K) Elite Series Gas Furnace Installation Instructions Comprehensive installation guide for the Lennox EL180UHNE(K) Elite Series Gas Furnace, covering setup, operation, safety, and maintenance.
	Lennox ML180UHE(K) Gas Furnace Installation Instructions Comprehensive installation guide for the Lennox ML180UHE(K) MERIT Series Gas Furnace, covering upflow and horizontal air discharge configurations. Includes safety warnings, parts list, installation procedures, clearances, and operational guidelines.
	Lennox ML180UH Gas Furnace Installation Instructions Comprehensive installation guide for the Lennox ML180UH MERIT® Series Gas Furnace, covering upflow and horizontal air discharge configurations. Includes safety precautions, installation requirements, clearances, and operational guidelines.
	Lennox EL297UHV Elite Series Gas Furnace Installation Instructions Comprehensive installation guide for the Lennox EL297UHV Elite Series Gas Furnace, covering upflow and horizontal air discharge configurations. Includes safety information, technical specifications, and installation procedures.
	Lennox ML196UHEK Gas Furnace Installation Instructions Comprehensive installation instructions for the Lennox ML196UHEK Merit Series Gas Furnace, covering upflow and horizontal air discharge configurations. Includes safety warnings, installation clearances, combustion air requirements, and unit setup.
	Lennox ML296UHVK Merit Series Gas Furnace Installation Instructions Comprehensive installation guide for the Lennox ML296UHVK Merit Series Gas Furnace, covering unit setup, safety precautions, venting, gas piping, electrical connections, and operational checks for optimal performance and safety.
	Lennox EL280DFE Gas Furnace Installation Instructions Comprehensive installation guide for the Lennox EL280DFE Elite Series Gas Furnace, covering safety, clearances, ducting, venting, gas piping, electrical connections, unit setup, operation, and maintenance.
	Lennox ML296DFVK Gas Furnace Installation Instructions This document provides comprehensive installation instructions for the Lennox ML296DFVK Merit Series Downflow Air Discharge gas furnace. It covers safety precautions, unit setup, venting, gas piping, electrical connections, and operational procedures.

[PDF] INSTALLATION INSTRUCTIONS EL195UHNEK - Lennox

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