6-583.19
5H0800040000
June, 2024
INSTALLATION AND SERVICE MANUAL
gas-fired unit heaters
model HD and HDB

HDB Gas Fired Unit Heaters

All models approved for use in California by the CEC and in Massachusetts. Unit heater is certified for residential and commercial applications. These unit heaters are certifed as Utility heaters and are intended for the heating of non-living spaces that are attached to, adjacent to, or part of a structure that contains space for family living quarters. They are not intended to be the primary source of heat in residential applications.
WARNING

1. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death, and could cause exposure to substances which have been determined by various state agencies to cause cancer, birth defects, or other reproductive harm. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
2. Do not locate ANY gas-fired units in areas where chlorinated, halogenated, or acid vapors are present in the atmosphere. These substances can cause premature heat exchanger failure due to corrosion, which can cause property damage, serious injury, or death.

FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:

1. Open windows.
2. Do not try to light any appliance.
3. Do not touch any electrical switch; do not use any phone in your building.
4. Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you can not reach your gas supplier, call your fire department.

FOR YOUR SAFETY
The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous.
IMPORTANT
The use of this manual is specifically intended for a qualified installation and service agency. All installation and service of these units must be performed by a qualified installation and service agency.

Inspection on Arrival

1. Inspect unit upon arrival. In case of damage, report it immediately to the transportation company and your local Modine sales representative.
2. Check rating plate on unit to verify that power supply meets available electric power at the point of installation.
3. Inspect unit upon arrival for conformance with description of product ordered (including specifications where applicable).

THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.

SPECIAL PRECAUTIONS

SPECIAL PRECAUTIONS
THE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN THIS MANUAL MUST BE FOLLOWED TO PROVIDE SAFE, EFFICIENT, AND TROUBLE-FREE OPERATION. IN ADDITION, PARTICULAR CARE MUST BE EXERCISED REGARDING THE SPECIAL PRECAUTIONS LISTED BELOW. FAILURE TO PROPERLY ADDRESS THESE CRITICAL AREAS COULD RESULT IN PROPERTY DAMAGE OR LOSS, PERSONAL INJURY, OR DEATH. THESE INSTRUCTIONS SUBJECT TO ANY MORE   RESTRICTIVE LOCAL OR NATIONAL CODES.
HAZARD INTENSITY LEVELS

1. DANGER: Indicates an imminently hazardous situation which, if not avoided, WILL result in death or serious injury.
2. WARNING: Indicates a potentially hazardous situation which, if not avoided, COULD result in death or serious injury.
3. CAUTION: Indicates a potentially hazardous situation which, if not avoided, MAY result in minor or moderate injury.
4. IMPORTANT: Indicates a situation which, if not avoided, MAY result in a potential safety concern.

DANGER
Appliances must not be installed where they may be exposed to a potentially explosive or flammable atmosphere.
WARNING

1. Gas fired heating equipment must be vented – do not operate unvented.
2. A built-in power exhauster is provided – additional external power exhausters are not required or permitted.
3. If an existing heater is being replaced, it may be necessary to resize the venting systems. Improperly sized venting systems can result in vent gas leakage or the formation of condensate. Refer to the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1 – latest edition. Failure to follow these instructions can result in injury or death.
4. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes.
5.  All field gas piping must be pressure/leak tested prior to operation. Never use an open flame. Use a soap solution or equivalent for testing. Gas pressure to appliance controls must never exceed 14″ W.C. (1/2 psi).
6. To reduce the opportunity for condensation, the minimum sea level input to the appliance, as indicated on the serial plate, must not be less than 5% below the rated input, or 5% below the minimum rated input of dual rated units.
7. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.
8. All appliances must be wired strictly in accordance with wiring diagram furnished with the appliance. Any wiring different from the wiring diagram could result in a hazard to persons and property.
9. Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 105°C.
10. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% greater than the rated voltage.
11. When servicing or repairing this equipment, use only factory-approved service replacement parts. A complete replacements parts list may be obtained by contacting the factory. Refer to the rating plate on the appliance for complete appliance model number, serial number, and company address. Any substitution of parts or controls not approved by the factory will be at the owner’s risk.

CAUTION

1. All literature shipped with this unit should be kept for future use for servicing or service diagnostics. Do not discard any literature shipped with this unit.
2. Consult piping, electrical, and venting instructions in this manual before final installation.
3. Do not attach ductwork, air filters, or polytubes to any propeller unit heater.
4. Clearances to combustible materials are critical. Be sure to follow all listed requirements.
5. Do not locate units in tightly sealed rooms or small compartments (commonly referred to as confined spaces) without provisions for adequate combustion air and venting. Combustion air must have access to the confined space through a minimum of two permanent openings in the enclosure, at least one near the bottom. They should provide a free area of one square inch per 1,000 BTU/Hr input rating of the unit with a minimum of 100 square inches for each opening, whichever is greater.
6. Low profile heaters are designed for use in heating applications with ambient startup temperatures between -40°F and 90°F, and ambient operating temperatures between 40°F and 90°F.
7. Do not install unit outdoors.
8. In garages or other sections of aircraft hangars, such as offices and shops that communicate with areas used for servicing or storage, keep the bottom of the unit at least 7′ above the floor unless the unit is properly guarded to provide user protection from moving parts. In parking garages, the unit must be installed in accordance with the standard for parking structures ANSI/NFPA 88A latest edition, and in repair garages the standard for repair garages NFPA 30A – latest edition (Formerly NFPA 88B). In  Canada, installation of heaters in airplane hangars must be in accordance with the requirements of the enforcing authority, and in public garages in accordance with the current CSA-B149 codes.
9. In aircraft hangars, keep the bottom of the unit at least 10′ from the highest surface of the wings or engine enclosure of the highest aircraft housed in the hangars and in accordance with the requirements of the enforcing authority and/or NFPA 409 – latest edition.
10. Installation of units in high humidity or salt water atmospheres will cause accelerated corrosion, resulting in a reduction of the normal life of the units.
11. Do not install units below 7′ measured from the bottom of the unit to the floor in commercial applications (unless unit is properly guarded to provide user protection from moving parts) and 5′ measured from the bottom of the unit to the floor in residential applications.
12. Be sure no obstructions block air intake and discharge of unit heaters.
13. The minimum distance from combustible material is based on the combustible material surface not exceeding 160°F. Clearance from the top of the unit may be required to be greater than the minimum specified if heat damage, other than fire, may occur to materials above the unit heater at the temperature described.
14. Allow 18″ of clearance at rear (or 6″ beyond end of motor at rear of unit, whichever is greater) and access side to provide ample air for combustion and proper operation of fan.
15. Installation must conform with local building codes or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, installation must be in accordance with CSA-B149.1.
16. Purging of air from gas supply line should be performed as described in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, installation must be in accordance with CSA-B149.1.
17. When leak testing the gas supply piping system, the appliance and its combination gas control must be isolated during any pressure testing in excess of 14″ W.C. (1/2 psi).
18. The unit should be isolated from the gas supply piping system by closing its field installed manual shut-off valve. This manual shut-off valve should be located within 6′ of the heater.
19. Turn off all gas before installing appliance.
20. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not less than 5% below the rated voltage.
21. Check the gas inlet pressure at the unit upstream of the combination gas control. The inlet pressure should be 6-7″ W.C. on natural gas or 11-14″ W.C. on propane. If inlet pressure is too high, install an additional pressure regulator upstream of the  combination gas control.
22. Service or repair of this equipment must be performed by a qualified service agency.
23. Do not attempt to reuse any mechanical or electronic ignition controllers which has been wet. Replace defective controller.

IMPORTANT

1. To prevent premature heat exchanger failure, do not locate ANY gas-fired appliances in areas where corrosive vapors (i.e. chlorinated, halogenated, or acidic) are present in the  atmosphere.
2. To prevent premature heat exchanger failure, the input to the appliance as indicated on the serial plate must not exceed the rated input by more than 5%.
3. To check most of the Possible Remedies in the trouble- shooting guide listed in Table 20.1, refer to the applicable sections of the manual.

SI (METRIC) CONVERSION FACTORS

To Convert	Multiply By	To Obtain
“W.C.	0.249	kPa
°F	(°F-32) x 5/9	°C
Btu	1.06	kJ
Btu/ft3	37.3	kJ/m3
Btu/hr	0.000293	kW
CFH (ft3/hr)	0.000472	m3/min
CFH (ft3/hr)	0.00000787	m3/s
CFM (ft3/min)	0.0283	m3/min
CFM (ft3/min)	0.000472	m3/s

To Convert	Multiply By	To Obtain
feet	0.305	m
Gal/Hr.	0.00379	m3/hr
Gal/Hr.	3.79	l/hr
gallons	3.79	l
Horsepower	746	W
inches	25.4	mm
pound	0.454	kg
psig	6.89	kPa
psig	27.7	“W.C.

BEFORE YOU BEGIN
CAUTION

1. All literature shipped with this unit should be kept for future use for servicing or service diagnostics. Leave manual with the owner. Do not discard any literature shipped with this unit.
2. Consult piping, electrical, and venting instructions in this manual before final installation.
3. Do not attach ductwork, air filters, or polytubes to any propeller unit heater.

In the U.S., the installation of these units must comply with the National Fuel Gas Code, ANSI Z223.1 – latest edition (also known as NFPA 54) and other applicable local building codes.
In Canada, the installation of these units must comply with local plumbing or waste water codes and other applicable codes and with the current code CSA-B149.1.

1. All installation and service of these units must be performed by a qualified installation and service agency only as defined in ANSI Z223.1 (NFPA 54) – latest edition, or in Canada by a licensed gas fitter.
2. This unit is certified with the controls furnished. For replacements parts, please order according to the replacement parts list on serial plate. Always know your model and serial numbers. Modine reserves the right to substitute other authorized controls as replacements.
3. Unit is balanced for correct performance. Do not alter fan or operate motors at reduced speed.
4. Information on controls is supplied separately.
5. The same burner is used for natural and propane gas.

UNIT LOCATION

UNIT LOCATION
DANGER
Appliances must not be installed where they may be exposed to a potentially explosive or flammable atmosphere.
CAUTION

1. Clearances to combustible materials are critical. Be sure to follow all listed requirements.
2. Do not locate units in tightly sealed rooms or small compartments (commonly referred to as confined spaces) without provisions for adequate combustion air and venting. Combustion air must have access to the confined space through a minimum of two  permanent openings in the enclosure, at least one near the bottom. They should provide a free area of one square inch per 1,000 BTU/Hr input rating of the unit with a minimum of 100 square inches for each opening, whichever is greater.
3. Low profile heaters are designed for use in heating applications with ambient startup temperatures between -40°F and 90°F, and ambient operating temperatures between 40°F and 90°F.
4. Do not install unit outdoors.
5. In garages or other sections of aircraft hangars such as offices and shops that communicate with areas used for servicing or storage, keep the bottom of the unit at least 7′ above the floor unless the unit is properly guarded. In parking garages, the unit must be installed in accordance with the standard for parking structures ANSI/NFPA 88A-latest edition, and in repair garages the standard for repair garages NFPA 30A – latest edition (Formerly NFPA 88B). In Canada, installation of heaters in airplane hangars
   must be in accordance with the requirements of the enforcing authority, and in public garages in accordance with the current CSA-B149 codes.
6. In aircraft hangars, keep the bottom of the unit at least 10′ from the highest surface of the wings or engine enclosure of the highest aircraft housed in the hangars and in accordance with the requirements of the enforcing authority and/or NFPA 409 – latest edition.
7. Installation of units in high humidity or salt water atmospheres will cause accelerated corrosion, resulting in a reduction of the normal life of the units.

IMPORTANT
To prevent premature heat exchanger failure, do not locate ANY gas-fired appliances in areas where corrosive vapors (i.e. chlorinated, halogenated or acid) are present in the atmosphere.
Location Recommendations

1. When locating the heater, consider general space and heating requirements, availability of gas and electrical supply, and proximity to vent locations.
2. When locating units, it is important to consider that the exhaust vent piping must be connected to the outside atmosphere.
3. Be sure the structural support at the unit location site is adequate to support the unit’s weight. For proper operation the unit must be installed in a level horizontal position.
4. Do not install units in locations where the flue products can be drawn into the adjacent building openings such as windows, fresh air intakes, etc.
   Table 4.1 Clearances

   Unit Side	Clearance to Combustible Material		Recommended Service Clearance
   	HD	HDB	HD/HDB
   Top and Bottom	1″	6″	18″
   Access Side	1″	6″	18″
   Non-Access Side	1″	6″	18″
   Rear	18″	18″	18″
   Vent Connector	4″	4″	18″

5. Be sure that the minimum clearances to combustible materials and recommended service clearances are maintained. Units are designed for installation with the minimum clearances as shown in Table 4.1.
6. Do not install units in locations where the gas ignition system is exposed to water spray, rain, or dripping water.
7. Mounting height (measured from bottom of unit) at which unit heaters are installed is critical. Refer to mounting height and heat throw data on page 18 of this manual. The maximum mounting height for any unit is that height above which the unit will not deliver heated air to the floor.

Combustion Air Requirements
The National Fuel Gas Code defines an “unconfined space” as a space whose volume is greater than 50 cubic feet per 1,000 Btu/Hr input of the installed appliance(s). A confined space is 50 cubic feet or less per 1,000 Btu/Hr input of the installed appliance(s).
It is not recommended to install these unit heaters into residential confined spaces. This recommendation is due to the concern that at some point in time, the combustion air openings provided by the installer may become blocked or eliminated by the owner, either intentionally or unintentionally. Despite this recommendation, if these units are installed into a residential confined space, see National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1 Installation Code – latest edition, for detailed combustion air provisions. The installation must adhere  to these requirements.
Units installed in confined spaces in industrial/commercial installations must be provided with two permanent openings – one near the top and one near the bottom of the confined space. Each opening should have a free area of not less than one square inch per 1,000 Btu/Hr of the total input rating of all units in the confined space, freely communicating with interior areas that have adequate infiltration from the outside.
For further details on supplying combustion air to a confined (tightly sealed) space or unconfined space, see the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1 Installation Code – latest edition.
Turning The Unit 180° (Model Sizes 30-75 Only)
All units are produced at the factory with left-side controls (when looking at the unit). If the installation requires the controls to be on the right side, all heaters – with the exception of the HD/HDB 100 and 125 – can be turned over by following the instructions below.

• By turning the unit 180° from the way it was received from the factory, the sides become opposite, but the front and back remain in the same relative position. The bottom panel now becomes the top panel and vice-versa.
• Remove the access panel, turn it 180°, and re-attach it to the unit so that all the information labels can be read.
• Remove the spring loaded deflector blades, turn them over, replace, and adjust so they are open and in a position to direct the heated air down to the floor.

UNIT MOUNTING

CAUTION

1. Do not install units below 7′ measured from the bottom of the unit to the floor in commercial applications (unless unit is properly guarded to provide user protection from moving parts) and 5′ measured from the bottom of the unit to the floor in residential  applications.
2. Be sure no obstructions block air intake and discharge of unit heaters.
3. The minimum distance from combustible material is based on the combustible material surface not exceeding 160°F. Clearance from the top of the unit may be required to be greater than the minimum specified if heat damage, other than fire, may occur to materials above the unit heater at the temperature described.
4. Allow 18″ clearance at rear (or 6″ beyond end of motor at rear of unit, whichever is greater) and access side to provide ample air for combustion and proper operation of fan.

CAUTION

1. Be sure the means of suspension is adequate to support the weight of the unit (see page 19 for unit weights).
2. For proper operation, the unit must be installed in a level horizontal position.
3. Clearances to combustibles as previously specified must be strictly maintained.
4. For model sizes 30-75, before lifting the heater for suspension, the mounting brackets must be installed as follows (for bracket accessory installation on model sizes 100-125, see the latest revision of literature 6-594):

• For standard (left side) control access, remove the 3 screws and mounting bracket along the top edge of both the front and back of the unit. Install the front bracket as shown in Figure 5.1 by aligning the screw holes on the bracket with the screw holes on the top edge of the unit. Repeat for the bracket on the back of the unit.
• For right side control access, remove the 3 screws and mounting bracket along the top edge of both the front and back of the unit. Turn the unit over and install the front bracket as shown in Figure 5.2 by aligning the screw holes on the bracket with the screw holes on the top edge of the unit (originally the bottom edge). Repeat for the bracket on the back of the unit.

5a. Suspension by screws/lag bolts: Secure the mounting brackets to the ceiling joists or truss, using 1/4″ screws with 1/2″ washers. These unit mounting brackets are slotted to accommodate joists on 16″ or 24″ centerlines.
Figure 5.1 – Unit Heater in Standard Mounting Configuration (30-75 Units Only)Figure 5.2 – Unit Heater Turned 180°
(30-75 units only) (Access panel and heated air outlet change sides)5b. Suspension by threaded rod: The unit can also be hung with threaded rod utilizing the same mounting brackets. Attach the threaded rod to the unit mounting brackets, securing with a top and bottom nut. For model sizes 100125, the units are designed to be suspended by threaded rod without the use of brackets. On each piece of 3/8″ threaded rod used, screw a nut a distance of about one inch onto the end of the threaded rods that will be screwed into the unit heater. Place a washer over the end of the threaded rod and screw the threaded rod into the unit heater weld nuts on the top of the heater at least 5 turns, and no more than 10 turns. Tighten the nut first installed onto the threaded rod to prevent the rod from turning.
Next, drill holes into a steel channel or angle iron at the same centerline dimensions as those chosen for the heater being installed. The steel channels or angle iron pieces need to span and be fastened to appropriate structural members. Cut the threaded rods to the preferred length, push them through the holes in the steel channel or angle iron and secure with washers and lock nuts, lock washers and nuts, or a washer with double nut arrangement.
NOTE: A pipe hanger adapter kit, shown in Figure 5.3, is available as an accessory. One kit consists of drilled 3/4″ IPS pipe caps and 3/8″ – 16 x 1-3/4″ capscrews to facilitate threaded pipe suspension.
5c. Shelf mounted units: The unit heater can also be installed on a shelf. The mounting brackets will need to be attached to the heater the same manner as explained in note #4, however, to mount on a shelf the brackets must go on the bottom of the heater. The brackets must be affixed to the shelf using similar screws (1/4″ screw with 1/2″ washer) as overhead joist or truss mounting. Be sure all clearance to combustible requirements are met.
Figure 5.3 – Unit Heater Suspension Methods

INSTALLATION – VENTING

WARNING

1. Gas fired heating equipment must be vented – do not operate unvented.
2. A built-in power exhauster is provided – additional external power exhausters are not required or permitted.
3. If an existing heater is being replaced, it may be necessary to resize the venting systems. Improperly sized venting systems can result in vent gas leakage or the formation of condensate. Refer to the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1 Installation Code – latest edition. Failure to follow these instructions can result in serious injury or death.
4. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes.

CAUTION
Installation must conform with local building codes or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, installation must be in accordance with CSA B149.1.
Model HD/HDB unit heaters must be vented with the proper passageway as described in these instructions to convey flue gases from the unit or the vent connector to the outside atmosphere.
The venting instructions are organized in sections, based on installation type. The sections are identified as follows:

InstructionsSection	Applicable Installation Instructions  by Vent System Type
A	General instructions for ALL installations
B	VERTICAL Category I vent systems ①
C	HORIZONTAL Category III vent systems ②

1 The difference between Vertical Category I and Horizontal Category III will be identified in “Section A – General Instructions – All Units”.

Section A – General Instructions – All Units
A1. If the unit heater being installed is replacing existing equipment and using the existing vent system from that equipment, inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1 Installation Codelatest edition and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
A2. The vent pipe should be galvanized steel or other suitable corrosion resistant material (except for Horizontal Category III vent systems, which will be covered in “Section C – Horizontal, Category III Vent System Installation”). Follow the National Fuel Gas Code for minimum thickness of vent material. The minimum thickness for connectors varies depending on the pipe diameter. Do not vent unit with PVC or other forms of plastic venting material.
A3. All heaters come with a factory installed vent adapter for attaching the vent pipe to the heater. Attach the vent pipe to the adapter with 3 non-corrosive screws. (Drill pilot holes through the vent pipe and adapter prior to screwing in place).
A4. Refer to Table 6.1 for total equivalent vent pipe lengths, making the vent system as straight as possible. The equivalent length of a 3″ elbow is 1′ and for a 4″ elbow is 5′.
Table 6.1 – Vent Pipe Diameters and Total Equivalent Vent Pipe Lengths For Horizontal Venting Systems

Model Size	Vent Pipe Diameter	Minimum Eqv. Length	Maximum Eqv. Length
30-75	3″	3′	30′
100-125	4″	3′	30′

A5. A minimum of 12″ straight pipe is recommended from the flue outlet before turns in the vent pipe.
A6. Horizontal sections of vent pipe are to be installed with a upward or downward slope from the appliance of 1/4 inch per foot and suspended securely from overhead structures at points not greater than 3′ apart.
A7. Fasten individual lengths of vent together with at least 3 corrosion-resistant sheet metal screws.
A8. Keep single wall vent pipe at least 6″ from combustible materials. For double wall vent pipe, follow the vent pipe manufacturer’s clearances to combustibles. The minimum distance from combustible materials is based on the combustible material surface not exceeding 160°F.
Clearance from the vent pipe (or the top of the unit) may be required to be greater than 6″ if heat damage other than fire could result (such as material distortion or discoloration).
A9. Avoid venting through unheated space when possible. When venting does pass through an unheated space or if the unit is installed in an environment that promotes condensation, insulate runs greater than 5′ to minimize condensation. Inspect for leakage prior to insulating and use insulation that is noncombustible with a rating of not less than 400°F. Install a tee fitting at the low point of the vent system and provide a drip leg with a clean out cap as shown in Figure 8.1.
A10. When the vent passes through a combustible INTERIOR wall or floor, a metal thimble 4″ greater than the vent diameter necessary. If there is 6′ or more of vent pipe in the open space between the appliance and where the vent pipe passes through the wall or floor, the thimble need only be 2″ greater than the diameter of the vent pipe. If a thimble is not used, all combustible material must be cut away to provide 6″ of clearance. Where authorities have jurisdiction, type B vent may be used for the last section of vent pipe to maintain clearance to combustibles while passing through wall or floor (see Figure 6.1). Any material used to close the opening must be noncombustible.
Figure 6.1 – Venting Through Combustible Roof or WallA11. The following are general instructions for double wall (type B) terminal pipe installation:
How to attach a single wall vent terminal to double wall (type B) vent pipe:

1. Look for the “flow” arrow on the vent pipe.
2. Slide the vent terminal inside the exhaust end of the double wall vent pipe.
3. Drill 3 holes through the pipe and the vent terminal. Using 3/4″ long sheet metal screws, attach the cap to the pipe. Do not over tighten.

How to connect a single wall vent system to double wall (type B) vent pipe:

1.  Slide the single wall pipe inside the inner wall of the double wall pipe.
2. Drill 3 holes through both walls of the single and double wall vent pipes. Using 3/4″ sheet metal screws, attach the two pieces of pipe. Do not over tighten.
3. The gap between the single and double wall pipe must be sealed, but it is not necessary to fill the full volume of the annular area. To seal, run a large bead of 400°F silastic around the gap.

A12. Vent termination clearances must be maintained, refer to Table 7.1.
A13. Do NOT use dampers or other devices in the vent or combustion air pipes.
A14. Precautions must be taken to prevent degradation of building materials by flue products.
A15. Single wall vent pipe must not pass through any unoccupied attic, inside wall, concealed space, or floor.
A16. Uninsulated single wall vent pipe must not be used outdoors for venting appliances in regions where the 99% winter design temperature is below 32°F.
Table 7.1 – Vent Termination Clearances

Vent Shall Terminate:	Structure	Reference Standard
3 feet above	Forced air inlet within 10′ (US)	NFPA 54
6 feet in all directions	Forced air inlet (Canada)	CSA B149.1
3 feet in all directions	Combustion Air inlet of another appliance	CSA B149.1
4 feet below, 4 feet horizontal, or 1 foot above	Door window, gravity air inlet, or any building opening (US)	NFPA 54
3 feet in all directions	Door window, gravity air inlet, or any building opening (Canada)	CSA B149.1
3 feet horizontal 1	Electric meter, gas meter, gas regulator, and relief equipment	CSA B149.1
2 feet in all directions	Adjacent building, adjoining building, or parapet wall	Modine
7 feet in all directions	Adjacent public walkways	NFPA 54/CSA B149.1
1 foot above	Grade (ground level)	NFPA 54/CSA B149.1
1 foot below or 1 foot beyond	Eave with 24″ overhang or less	Modine
3 feet below or 1 foot beyond	Eave with greater than 24″ overhang	Modine

1 Do not terminate the vent directly above a gas meter or regulator. Recommendations based on CSA B149.1 and NFPA 54. Venting must conform with applicable current revision of local and
national installation codes.
A17. The vent terminal must be:

Model Size	Modine PN
30-75	5H0722850005
100-125	5H0722850001

Table 7.2 – Vent TerminalsA18. In addition to following these general instructions, specific instructions for Vertical Category I or Horizontal Category III vent systems must also be followed. Table 7.3 outlines the differences:
Table 7.3 – ANSI Unit Heater Venting Requirements

Category	Description	Venting Requirements
I	Negative vent pressure Non- condensing	Follow standard venting requirements.
II	Negative vent pressure Condensing	Condensate must be drained.
III	Positive vent pressure Non-condensing	Vent must be gas tight.
IV	Positive vent pressure Condensing	Vent must be liquid and gastight. Condensate must be drained.

Section B – Vertical Vent System Installation
B1. This section applies to vertically vented Category I vent systems and is in addition to “Section A – General Instructions – All Units”.
B2. Vertical vent systems terminate vertically, and must be sized in accordance with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition.
B3. The horizontal portion of the vent run cannot exceed 75% of the vertical rise (Example: If the vent height is 10′, the horizontal portion of the vent system cannot exceed 7.5′).
B4. It is recommended to install a tee with drip leg and clean out cap as shown in Figure 8.1.
B5. The vent terminates a minimum of 5’ above the vent connector on the unit.
B6. All vertically vented heaters that are Category I must be connected to a chimney or vent complying with a recognized standard, or a lined masonry (or concrete) chimney with a material acceptable to the authority having jurisdiction.
Venting into an unlined masonry chimney is not permitted. Refer to the National Fuel Gas Code for common venting and pages 11-12 of this manual.
B7. Use a listed vent terminal to reduce down drafts and moisture in the vent.
B8. Double wall vent pipe is recommended, although single wall can be used if the requirements of the National Fuel Gas Code are followed.
B9. Vertical vents must terminate a minimum horizontal and vertical distance from roof lines and adjacent walls or obstructions. These minimum distances are outlined as follows (based on National Fuel Gas Code requirements for vents with diameters less than 12”):

• For double wall vent pipe and 8′ or greater horizontal distance to any vertical wall or similar obstruction, the vent must terminate above the roof in accordance with Figure 8.1 and Table 8.1.
• For double wall vent pipe and less than 8′ horizontal distance to any vertical wall or similar obstruction, the vent must terminate at least 2′ above the highest point where it passes through a roof of a building and at least 2′ higher than any portion of a building within a horizontal distance of 10′ (see Figure 8.1).

Table 8.1 – Minimum Height from Roof to Lowest Discharge Opening

Rise X (in)	Roof Pitch	Min Height H (ft) ①
0-6 6-7	Flat to 6/126/12 to 7/1 2	1.00 1.25
7-8	7/12 to 8/12	1.50
8-9	8/12 to 9/12	2.00
9-10	9/12 to 10/12	2.50
10-11	10/12 to 11/12	3.25
11-12	11/12 to 12/12	4.00
12-14	12/12 to 14/12	5.00
14-16	14/12 to 16/12	6.00
16-18	16/12 to 18/12	7.00
18-20	18/12 to 20/12	7.50
20-21	20/12 to 21/12	8.00

1 Size according to expected snow depth.
Figure 8.1 – Vertical Vent Termination for Double Wall Vent Pipe and Greater Than or Less Than 8’ Horizontally From a Vertical Wall or Obstruction

• For single wall vent pipe and 10′ or greater horizontal distance to any portion of a building, the vent must terminate at least 3′ (2′ for non-residential installations) above the highest point where it passes through a roof of a building and at least 2′ higher than any portion of a building within a horizontal distance of 10′ (see Figure 9.1).

Figure 9.1 – Vertical Vent Termination for Single Wall Vent Pipe and Greater Than 10’ Horizontally From Adjacent Wall or Building

• For single wall vent pipe and less than 10′ horizontal distance to any portion of a building, the vent must terminate 2′ higher than any portion of that building (see Figure 9.2).
  

Figure 9.2 – Vertical Vent Termination for Single Wall Vent Pipe and 10’ or Less Horizontally From Adjacent Building or Building
B10. Once venting is complete, proceed to the section titled “Installation – Gas Connections”.

Section C – Horizontal, Category III Vent System Installation
C1. This section applies to horizontally vented Category III vent systems and is in addition to “Section A – General Instructions – All Units”. Category III vent systems listed by a nationally recognized agency and matching the diameters specified may be used. Different brands of vent pipe materials may not be intermixed. Under no circumstances should two sections of double wall vent pipe be joined together within one horizontal vent system due to the inability to verify complete seal of inner pipes.
C2. All heaters that are horizontally vented perform as a Category III appliance. Category III venting has special venting requirements as follows.

• All residential, horizontally vented Category III heaters must be vented with an agency certified (UL1738) Category III venting system. Agency certified Category III venting systems are available from your local vent pipe distributor. Follow the agency certified Category III vent manufacturer’s instructions for installation.
• For commercial and industrial horizontally vented heaters you may use either agency certified Category III venting systems as noted above, or single wall galvanized or stainless steel vent pipe. For single wall vent systems, one continuous section of double wall vent pipe may be used within the vent system to pass through the wall to the listed terminal. Refer to instruction A10 in “Section A – General Instructions – All Units” for attaching double wall pipe to single wall pipe. If un-gasketed single wall vent pipe is used, all seams and joints must be sealed with metallic tape or silastic suitable for temperatures up to 400°F (3M aluminum foil tapes 433 or 363 are acceptable). Wrap tape two full turns around the vent pipe.

C3. All horizontal Category III vents must be terminated with a listed vent cap. The cap must terminate a minimum distance from the external wall, as summarized in Table 10.1.
Table 10.1 – Minimum Length Between External Wall and Vent

Model Size	Application	Min. Length A ①
30-75	Residential & Commercial	11″
100, 125	Residential	12″
100, 125	Commercial	24″

1 Refer to Figure 10.2 and 10.3.
C4. The vent must be supported as shown in Figure 10.1.
Figure 10.1 – Exhaust Vent Construction Through Combustible Walls and Support Bracket
C5. When condensation may be a problem, the vent system shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief openings, or other equipment.
C6. The venting system must be exclusive to a single unit, and no other unit is allowed to be vented into it.
Figure 10.2 – Horizontal Category III Venting with Upward Pitch Figure 10.3 – Horizontal Category III Venting with Downward Pitch (with drip leg)C7. When vented horizontally, maintain a 1/4″ per foot rise away from the heater and place a drip leg with clean out near the unit as shown in Figure 10.2. Where local authorities have jurisdiction, a 1/4″ per foot downward slope is acceptable with a drip leg and clean out near the exit of the vent as shown in Figure 10.3, or allow the condensate to drip out the end.
C8. For a vent termination located under an eave, the distance of the overhang must not exceed 24″. The clearance to combustibles above the exterior vent must be maintained at a minimum of 12″. Consult the National Fuel Gas Code for additional requirements for eaves that have ventilation openings.
C9. Once venting is complete, proceed to the section titled “Installation – Gas Connections”.
Additional Requirements for Common Venting:

1. The common vent system and all attached appliances must be Category I.
2. The vent connector should be routed in the most direct route from the units to the common vent.
3. Where 2 or more vent connectors enter a common gas vent or chimney flue, the smaller connector shall enter at the highest level consistent with the available head room or clearance to combustible material.
4. Restrictions within the common vent such as elbows should be minimized. Each elbow installed within the common portion of the venting system reduces maximum common vent capacity by 10% (refer to Tables 11.2 and 11.3 for capacity).
5. The vent connector capacities included in these tables allow for the use of two 90° elbows (or turns). For each additional elbow, the vent connector capacity shall be reduced by 10%. Refer to NFPA54/ IFEC tables for capacity ratings.
6. The common vent cross sectional area must be equal to or greater than the largest vent connector cross-sectional area.
7. If all appliances are located on one level of the building, the vent height shall be measured from the highest draft hood or vent connector to be installed within the common vent system (refer to Figures 11.1 and 11.2).
8. All units must be vented in strict accordance of the common venting Tables 11.1 through 11.3.
9. All masonry chimneys must comply with all applicable local and national codes.
10. When combining multiple vent connectors into a manifold prior to the vertical portion of the common vent, the size of the common vent manifold and the common vent shall be determined by applying a 10% reduction (.90 x maximum vent capacity from Table 11.2 or 11.3) to the common vent capacity part of the common vent tables. The length of the common vent manifold (Lm) may not exceed 18 inches per inch of manifold diameter.
11. Refer to the National Fuel Gas Code for instructions on multi-level common venting and exterior masonry chimneys as well as additional installation of the listed applications.

Figure 11.1 – Common Venting into Double Wall B VentTable 11.1 – Maximum Vent Connector Horizontal Run (ft) – Type B Vent Connector

Connector Dia.	Model	Max Horiz. Run
3″	30,45,60,75	4.5
4″	100, 125	6

Table 11.2 – Maximum Total Appliance Input Capacities (MBh) – Type B Vent Connector and Type B Common Vent

Vent Height (ft)	Diameter of Common Vent
	4 in.		5 in.		6 in.		7 in.
	Fan+Fan	Fan+Nat	Fan+Fan	Fan+Nat	Fan+Fan	Fan+Nat	Fan+Fan	Fan+Nat
6	92	81	140	116	204	161	309	248
8	101	90	155	129	224	178	339	275
10	110	97	169	141	243	194	367	299
15	125	112	195	164	283	228	427	352
20	136	123	215	183	314	255	475	394
30	152	138	244	210	361	297	547	459

Table 11.3 – Maximum Total Appliance Input Capacities (MBh) – Type B Vent Connector with Common Vent into Masonry Chimney

Vent Height (ft.)	Area of Common Vent
	12 in2		19 in2		28 in2		38 in2
	Fan+ Fan	Fan+ Nat	Fan+ Fan	Fan+ Nat	Fan+ Fan	Fan+ Nat	Fan+ Fan	Fan+ Nat
6	NA	74	NA	119	NA	178	NA	257
8	NA	80	NA	130	NA	193	NA	279
10	NA	84	NA	138	NA	207	NA	299
15	NA	NA	NA	152	NA	233	NA	334
20	NA	NA	NA	NA	NA	250	NA	368
30	NA	NA	NA	NA	NA	270	NA	404

Based on ANSI Z223.1 (NFPA 54)-2009. For reference only.
Figure 11.2 – Common Venting into Masonry Chimney

INSTALLATION – GAS CONNECTIONS

WARNING

1. All field gas piping must be pressure/leak tested prior to operation. Never use an open flame. Use a soap solution or equivalent for testing.
2. Gas pressure to appliance controls must never exceed 14″ W.C. (1/2 psi).
3. To reduce the opportunity for condensation, the minimum sea level input to the appliance, as indicated on the serial plate, must not be less than 5% below the rated input, or 5% below the minimum rated input of dual rated units.

CAUTION

1. Purging of air from gas lines should be performed as described in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition or in Canada CSA-B149 codes.
2. When leak testing the gas supply piping system, the appliance and its combination gas control must be isolated during any pressure testing in excess of 14″ W.C. (1/2 psi).
3. The unit should be isolated from the gas supply piping system by closing its field installed manual shut-off valve. This manual shut-off valve should be located within 6′ of the heater.
4. Turn off all gas before installing appliance.

IMPORTANT
To prevent premature heat exchanger failure, the input to the appliance, as indicated on the serial plate, must not exceed the rated input by more than 5%.

1. Installation of piping must conform with local building codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) – latest edition. In Canada, installation must be in accordance with CSA-B149.1.
2. Piping to units should conform with local and national requirements for type and volume of gas handled and pressure drop allowed in the line. Refer to Table 12.1 to determine the cubic feet per hour (CFH) for the type of gas and size of unit to be installed. Using this CFH value and the length of pipe necessary, determine the pipe diameter from Table 12.2. Where several units are served by the same main, the total capacity, CFH, and length of main must be considered. Avoid pipe sizes smaller than 1/2″. Table 12.2 allows for a 0.3″ W.C. pressure drop in the supply pressure from the building main to the unit. The inlet pressure to the unit must be 6-7″ W.C. for natural gas and 11-14″ W.C. for propane gas. When sizing the inlet gas pipe diameter, make sure that the unit supply pressure can be met after the 0.3″ W.C. has been subtracted. If the 0.3″ W.C. pressure drop is too high, refer to the Gas Engineer’s Handbook for other gas pipe capacities.
3. Install a ground joint union with brass seat and a manual shutoff valve adjacent to the unit for emergency shut-off and easy servicing of controls, including a 1/8″ NPT plugged tapping accessible  for test gauge connection (see Figure 12.1).
4. Use 2 wrenches when connecting field piping to units.
5. Provide a sediment trap before each unit in the line where low spots cannot be avoided (see Figure 12.1).
6. When pressure/leak testing, pressures above 14″ W.C. (1/2 psi), close the field installed shut-off valve, disconnect the appliance and its combination gas control from the gas supply line, and plug the supply line before testing. When testing pressures 14″ W.C. (1/2 psi) or below, close the manual shut-off valve on the appliance before testing.

Figure 12.1 – Recommended Sediment Trap/Manual Shut-off Valve Installation – Side or Bottom Gas Connection 11 Manual shut-off valve is in the “OFF” position when handle is perpendicular to pipe.
Table 12.1 – Sea Level Manifold Pressure & Gas Consumption 

Model Size	BTU/Cu. Ft. Specific Gravity	Natural	Propane	No. of Orifices
		1050 0.60	2500 1.53
Manifold Pressure In. W.C.		3.5	10.0
30	CFH Gal/Hr. Propane Sec/cu. ft. Orifice Drill Size	28.6 126 49	12.0 .33 300 56	2
45	CFH Gal/Hr. Propane Sec/cu. ft. Orifice Drill Size	42.9 84 49	18.0 .50 200 56	3
60	CFH Gal/Hr. Propane Sec/cu. ft. Orifice Drill Size	57.1 63 49	24.0 .66 150 56	4
75	CFH Gal/Hr. Propane Sec/cu. ft. Orifice Drill Size	71.4 50 49	30.0 .83 180 56	5
100	CFH Gal/Hr.Propane Sec/cu.ft. Orifice Drill Size	95.2 38 45	40 1.09 90 55	5
125	CFH Gal/Hr.Propane Sec/cu.ft.	11930	50 1.37 72	5
125	Orifice Drill Size	42	53

Table 12.2 – Gas Pipe Capacities – Natural Gas 1 2

Pipe Length (ft)	Natural Gas
	1/2″	3/4″	1″	1-1/4″	1-1/2″	2″
10	132	278	520	1050	1600	3050
20	92	190	350	730	1100	2100
30	73	152	285	590	890	1650
40	63	130	245	500	760	1450
50	56	115	215	440	670	1270
60	50	105	195	400	610	1150
70	46	96	180	370	560	1050
80	43	90	170	350	530	930
100	38	79	150	305	460	870
125	34	72	130	275	410	780
150	31	64	120	250	380	710

1. Capacities in cubic feet per hour through Schedule 40 pipe with maximum 0.3″W.C. pressure drop with up to 14″W.C. gas pressure. Specific gravity is 0.60 for natural gas and 1.50 for propane gas.
2. For pipe capacity with propane gas, divide natural gas capacity by 1.6.
   Example: What is the propane gas pipe capacity for 60 feet of 1-1/4″ pipe?
   The natural gas capacity is 400 CFH. Divide by 1.6 to get 250 CFH for propane gas.

INSTALLATION – HIGH ALTITUDE ACCESSORY KIT

HIGH ALTITUDE ACCESSORY KIT
Modine’s gas-fired equipment standard input ratings are certified by ETL. For elevations above 2,000′, ANSI Z223.1 requires ratings be reduced 4 percent for each 1000′. above sea level. For units in Canada, CSA requires that ratings be reduced 10 percent at elevations above 2,000′. The high altitude adjustment instructions and pressure switch kits listed in this manual are for use with units that will be installed over 2,000′ These methods and kits comply with both ANSI Z223.1 and CSA requirements.
If a unit is to be installed at higher elevations AND converted from natural gas to propane gas operation, a propane conversion kit must be used in conjunction with the pressure adjustment methods and pressure switch kits listed herein. For the selection and installation instructions for propane conversion kits, please see the latest revision of Modine Manual 75-515.
Selection of the Proper Pressure and Kit
To determine the proper manifold pressure at altitude and if required, the proper combustion air pressure switch kit, the full model number of the heater, the fuel to be used, and the altitude the unit will be installed at must be known. Refer to the unit serial plate or carton label to obtain the necessary information about the unit.
After obtaining this information, refer to the gas pressure and selection charts shown in Tables 13.1 through 14.1. The pressure charts are differentiated by elevation, fuel type, and country the product is being installed in. The selection charts are differentiated by product type, altitude and fuel type. If converting from natural gas to propane gas and operation at high altitude, both a propane conversion kit and a pressure switch kit must be used (if applicable). Selection charts include the proper kit suffix, when required.
Table 13.1 – Natural Gas Heating Values at Altitude 1 2 4

Altitude (ft)	Gas Heating Values at Altitude (BTU/ft3)
	USA	Canada
0-2,000	1,050	1,050
2,001-3,000	929	945
3,001-4,000	892
4,001-4,500	874
4,501-5,000	856	856
5,001-6,000	822	822
6,001-7,000	789	789
7,001-8,000	757	757
8,001-9,000	727	727
9,001-10,000	698	698
10,001-11,000	670	670
11,001-12,000	643	643
12,001-13,000	618	618
13,001-14,000	593	593

Manifold Pressure Adjustment
The inlet pressure to the unit must be confirmed to be within acceptable limits (6-7″ W.C. for natural gas and 11-14″ W.C.
for propane gas) before opening the shutoff valve or the combination gas valve may be damaged.
Heaters for use with natural gas have gas valves that need to be field set at 3.5” W.C. manifold pressure at 7.0” W.C. inlet pressure.
Units for use with propane gas need to be field set for 10.0” W.C. manifold pressure at 14.0” W.C. inlet pressure.
Installation above 2,000′ elevation requires adjustment of the manifold pressure as described.
Derated BTU Content Gas and Manifold Pressure Calculation
Some utility companies may derate the BTU content (heating value) of the gas provided at altitude to a value other than 1,050 BTU/ft3 for natural gas or 2,500 BTU/ft3 for propane gas to allow certain heating appliances to be used with no manifold pressure adjustments. For this reason it is necessary that the supplying utility be contacted for detailed information about the gas type and BTU content (heating value) before operating any heater. Tables 13.1 and 13.2 show the standard derated heating values (4% per 1,000′ of elevation in the USA and 10% between 2,001′ and 4,500′ elevation in Canada) of natural and propane gases at various altitudes. If the utility is supplying gas with heating values as shown in Tables 13.1 and 13.2, the manifold pressure should be set to 3.5″ W.C for natural gas and 10.0″ W.C. for propane gas.
NOTE: Only the high fire gas pressure need be adjusted, low fire gas pressure should remain the same.
Table 13.2 – Propane Gas Heating Values at Altitude 2 3 4

Altitude (ft)	Gas Heating Values at Altitude (BTU/ft3)
	USA	Canada
0-2,000	2,500	2,500
2,001-3,000	2,212	2,250
3,001-4,000	2,123
4,001-4,500	2,080
4,501-5,000	2,038	2,038
5,001-6,000	1,957	1,957
6,001-7,000	1,879	1,879
7,001-8,000	1,803	1,803
8,001-9,000	1,731	1,731
9,001-10,000	1,662	1,662
10,001-11,000	1,596	1,596
11,001-12,000	1,532	1,532
12,001-13,000	1,471	1,471
13,001-14,000	1,412	1,412

1. Values shown are for 3.5″ W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 14.1 to calculate manifold pressure.
2. Values shown are for 10.0″ W.C. manifold pressure, for other BTU content values (available from local utility) use Equation 14.1 to calculate manifold pressure.
3. When installed at altitudes above 2,000′, a pressure switch may need to be changed. Refer to Table 14.1 to determine if a switch change is required.
4. Gas heating values are derated 4% per 1,000′ of elevation in the USA and 10% between 2,000′ and 4,500′ elevation in Canada in accordance with ANSI Z223.1 and CSA-B149, respectively.

If the heating value of the gas being supplied is different than the values shown in Tables 13.1 and 13.2, use the following equation to determine the appropriate manifold pressure for the altitude and gas heating value being supplied.
Equation 14.1 – Manifold Pressure for Derated GasWHERE:

MP ACT  =	Manifold Pressure (in. W.C.) at Altitude – Manifold pressure setting for the heater being installed
BTU TBL =	BTU/ft3 Content of Gas – Obtained from Tables 13.1 or 13.2 (whichever is applicable)
BTU ACT =	BTU/ft3 Content of Gas – Obtained from the local utility company
MP SL =	Manifold Pressure (in. W.C.), at Sea Level – Use 3.5″ W.C. for natural gas and 10.0″ W.C. for propane gas

NOTE: Only the primary manifold pressure should be adjusted on units equipped with two-stage or modulating gas controls.
No adjustments to the low fire manifold pressure are necessary on these units.
Table 14.1 – High Altitude Kits for HD/HDB 1

US and Canada Altitude (ft)	Model Size
	30	45	60	75	100	125
	Item Code	Item Code	Item Code	Item Code	Item Code	Item Code
0-2,000	not required	not required	not required	not required	not required	not required
2,001-4,500	67248	67248	67248	67248	67248	67248
4,501-5,000	67248	67248	67248	67248	67248	67248
5001-5500	67248	67248	55950	55946	67248	67248
5501-6000	67248	67248	55950	55946	67248	68408
6001-6500	67248	67248	55950	55946	67248	68408
6501-7000	67248	67248	55950	55946	68408	68408
7001-7500	67248	67248	55950	55946	68408	68408
7501-8000	67248	67248	55946	55946	68408	68408
8001-8500	67248	67248	55946	55945	68408	68408
8501-9000	67248	67248	55946	55945	68408	68408
9001-9500	67248	55945	55946	55945	68408	68408
9501-10000	55945	55945	55946	55945	68408	68408
10001-11000	55945	55945	55946	55945	68409	68409
11001-12000	55945	55945	55946	55945	68409	68409
12001-13000	N/A	55945	55945	N/A	68411	68411
13001-14000	N/A	55945	55945	N/A	68411	68411

1 For Label Only (67248) kits, Modine part number 5H0807146005 is required to be filled out and attached to the unit by the installer.
Please contact the local Modine representative at 1.800.828.4328 (HEAT).

INSTALLATION – ELECTRICAL CONNECTIONS

ELECTRICAL CONNECTIONS
WARNING

1. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.
2. All appliances must be wired strictly in accordance with wiring diagram furnished with the appliance. Any wiring different from the wiring diagram could result in a hazard to persons and property.
3. Any original factory wiring that requires replacement must be replaced with wiring material having a temperature  rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% greater than rated voltage.

CAUTION
Ensure that the supply voltage to the appliance, as indicated on the serial plate, is not 5% less than the rated voltage.

1. Installation of wiring must conform with local building codes, or in the absence of local codes, with the National Electric Code ANSI/NFPA 70 – Latest Edition. Unit must be electri cally grounded in conformance to this code. In Canada, wiring must comply with CSA C22.1, Part 1, Electrical Code.
2. Two copies of the unit wiring diagram are provided with each unit. One is located in the side access control compartment and the other is supplied in the literature packet. Refer to this diagram for all wiring connections.
3. Make sure all multi-voltage components (motors, transformers, etc.) are wired in accordance with the power supply voltage.
4. The power supply to the unit must be protected with a fused or circuit breaker switch.
5. The power supply must be within 5 percent of the voltage rating and each phase must be balanced within 2 percent of each other. If not, advise the utility company.
6. External electrical service connections that must be installed include:
   a. Supply power connection (115, 208, 230, 460, or 575 volts).
   b. Connection of thermostats, or any other accessory control devices that may be supplied (24 volts).
   NOTE: All units with supply voltage 208V and greater must use a field installed step-down transformer, available as a separate accessory.
7. Refer to Figures 18.1 and 18.2 for the side access control compartment location.
8. All supply power electrical connections are made in the side access control compartment of the unit. The low voltage (thermostat and accessory control devices) can be wired to the terminals in the side access control compartment. Refer to the wiring diagram for the terminal location of all low voltage wiring.

ELECTRICAL CONNECTIONS
Location of thermostat should be determined by heating requirements and be mounted on an inside wall about 5′ above floor level where it will not be affected by heat from the unit or other sources, or drafts from frequently opened doors. See instructions packed with thermostat.
Wiring Adjustments for Blower Motors
The blowers used on Modine HDB units are direct drive and equipped with three speed motors. Air temperature rise of the unit is determined by the speed setting and the amount of static pressure in the system. Units are normally shipped with motors set at high speed. Motor speed is changed by connecting the motor lead for the desired fan speed to the “EAC” or “BLO” terminal of the control board. Unused motor leads for other speeds are placed on the “PARK” terminals of the board (see the wiring diagram on page 21).
When applying a blower equipped unit to a duct system or other load, consult the performance curves on this page to determine the air temperature rise for a given motor speed range and static pressure. Verify that the static pressure on the outlet of the unit does not exceed the maximum specified for the unit. If static pressure is too high it must be reduced either by modifications to the system or using the medium or low motor speed. If the unit shuts down on high limit during normal operation, a higher motor speed should be used.
Blower Curve Models (HDB 60-125 Only)

INSTALLATION – OPERATION

OPERATION
Prior to Operation
IMPORTANT

1. To prevent premature heat exchanger failure, observe heat exchanger tubes. If the bottom of the tubes become red while blower and furnace are in operation, check to be sure the blower has been set to the proper RPM for the application. Refer to page 16 for wiring adjustments for blower motors.
2. Start-up and adjustment procedures must be performed by a qualified service agency.

Although this unit has been assembled and fire-tested at the factory, the following pre-operational procedures should be performed to assure proper on-site operation.

1. Turn off power to the unit at the disconnect switch. Check that fuses or circuit breakers are in place and sized correctly. Turn all hand gas valves to the “OFF” position.
2. Remove the side control access panel.
3. Check that the supply voltage matches the unit supply voltage listed on the Model Identification plate. Verify that all wiring is secure and properly protected. Trace circuits to insure that the unit has been wired according to the wiring diagram. If installed at altitudes above 2,000′ and the high altitude kit includes a combustion air proving switch, replace the switch in the unit with the switch provided in the kit. Take care to ensure that the tubing and electrical connections are securely fastened.
4. Check to insure that the venting system is installed correctly and free from obstructions. Before you start use the following steps to verify that the venting system is adequately sized:
   a. Seal any unused openings in the venting system.
   b. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code – latest edition and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies, which could cause an unsafe condition.
   c. Insofar as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building. Turn on clothes dryers and any exhaust fans such as range hoods and bathroom exhausts, so they shall operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
   d. Follow the lighting instructions. Place the appliance being inspected in operation. Adjust thermostat so that the appliance will operate continuously.
   e. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their previous conditions of use.
   f. If improper venting is observed during any of the above tests, the venting system must be corrected.
5. Check to see that there are no obstructions to the intake and discharge of the unit.
6. Check fan clearance. Fan should not contact casing when spun by hand.
7. Check to make sure that all filters are in place and that they are installed properly according to direction of air flow (if applicable).
8. Perform a visual inspection of the unit to make sure no damage has occurred during installation. Check to ensure all fasteners are in place and the burner openings are properly aligned with the heat exchanger tubes and that the gas orifices are centered in the burner inspirator tube opening.
9. Check that all horizontal deflector blades are open a minimum of 30° as measured from vertical.
10. Turn on power to the unit at the disconnect switch.
11. Check the thermostat, ignition control, gas valve, and supply fan blower motor for electrical operation. If these do not function, check that the wiring is per the diagram.
12. Check the blower wheel for proper direction of rotation when compared to the air flow direction arrow on the blower housing (if applicable). Blower wheel rotation, not air movement, must be checked as some air will be delivered through the unit with the blower wheel running backwards.
13. For blower units, check the blower speed (RPM). Refer to “Blower Adjustments” for modification.
14. Check the motor speed (RPM).
15. Check the motor voltage.
16. Check the motor amp draw to make sure it does not exceed the motor nameplate rating.
17. Recheck the gas supply pressure at the field installed manual shut-off valve. The minimum inlet pressure should be 6″ W.C. on natural gas and 11″ W.C. on propane gas. The maximum inlet pressure for either gas is 14″ W.C. If inlet pressure exceeds 14″ W.C., a gas pressure regulator must be added upstream of the combination gas valve.
18. Open the field installed manual gas shut-off valve.
19. Place the manual main gas valve on the combination gas valve in the “ON” position. Call for heat with the thermostat.
20. Check to make sure that the main gas valve opens. Check the manifold gas pressure (See “Main Burner Adjustment”) while the supply fan blower is operating.
21. Check to insure that gas controls sequence properly (see “Control Operating Sequence”). If you are not familiar with the unit’s controls (i.e. combination gas control), refer to the control manufacturer’s literature supplied with the unit.
22. Once proper operation of the unit has been verified, remove any jumper wires that were required for testing.
23. Replace the side control access panel.
24. If installed at altitudes above 2,000′, affix label included with high altitude kit and fill in all fields with a permanent marker.

Main Burner Adjustment
The gas pressure regulator (integral to the combination gas control) is adjusted at the factory for average gas conditions. It is important that gas be supplied to the unit heater in accordance with the input rating on the serial plate. Actual input should be checked and necessary adjustments made after the unit heater is installed. Over-firing, a result of too high an input, reduces the life of the appliance and increases maintenance. Under no circumstances should the input exceed that shown on the serial plate.Measuring the manifold pressure is done at the outlet pressure tap of the gas valve.
To Adjust the Manifold Pressure

1. Move the field installed manual shut-off valve to the “OFF” position.
2. Loosen the 3/32” hex head screw in the outlet pressure tap on the gas valve and, using a 5/16” ID hose, attach a water manometer of “U” tube type which is at least 12” high.
3. Move the field installed manual gas shut-off valve to the “ON” position.
4. Create a high-fire call for heat from the thermostat.
5. Refer to Table 12.1 to determine the correct high fire manifold pressure for the gas type of the unit. Pressures at 0-2,000′ elevation are 3.5″ W.C. for natural gas, 10″ W.C. for propane gas, for elevations above 2,000′ refer to the instructions on page 13. Adjust the main gas pressure regulator spring to achieve the proper manifold pressure (for location, see the combination gas control literature supplied with unit).
6. After adjustment, move the field installed manual shut-off valve to the “OFF” position and re-tighten the 3/32” hex screw.
7. After the screw is tightened, move the field installed manual shut-off valve to the “ON” position and recheck pipe plugs for gas leaks with soap solution.

CONTROL OPERATING SEQUENCE / UNIT COMPONENTS

CONTROL OPERATING SEQUENCE
Upon a call for heat from the thermostat, power is supplied to the power exhauster motor. The unit will go through a purge period and then the direct spark igniter will be energized. At the same time, the main valve in the combination control valve will open to allow gas to flow to the burners. If the fan motor has not all ready started it will start shortly. If a flame is not sensed for any reason the main valve will close and there will be a short purge period before ignition is tried again. If the flame is not sensed after 4 tries, there will be at least a 1 hour wait before ignition is tried again.
Figure 18.1 – Major Gas, Electrical Service, Safety and Other Components

1. Power Exhauster
2. Pressure Switch
3. Integrated Direct Spark Control Board
4. Combination Gas Control
5. Control Transformer
6. Flame Sensor (hidden)
7. Flame Rollout Switch
8. Auto Reset Limit Control (hidden)
9. Direct Spark Igniter (hidden)
10. Manual Reset Control (hidden, propeller 100-125 only)

Table 18.1 – Control Options

Control Description	Control Code No.	Service Voltage	Thermostat Voltage	Type of Gas	Model Size
Single-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry – Utilizes a single-stage combination gas control with ignition control. Gas is lit with a direct spark igniter on call for heat.	11	115V	24V	Natural	30-125
	21	115V	24V	Propane	30-125
Two-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry – Utilizes a two-stage combination gas control with built-in ignition control. Firing rate is 100% and 50% of full rated input. Gas is lit with a direct spark igniter on call for heat.	12	115V	24V	Natural	75-125
	22	115V	24V	Propane	75-125

Table 18.2 – Propeller Model HD Performance

	Model HD Sizes
	30	45	60	75	100	125
Btu/Hr Input	30,000	45,000	60,000	75,000	100,000	125,000
Btu/Hr Output	24,900	37350	49800	62,250	82,000	102,500
Entering Airflow (CFM) @ 70°F	505	720	990	1160	1490	1980
Outlet Velocity (FPM)	523	725	653	769	565	747
Air Temp. Rise (°F)	44	46	45	48	50	47
Max. Mounting Height (Ft.)	10	10	12	14	12	16
Heat Throw (Ft.) (@ Max Mtg Ht.)	25	27	36	38	42	56
Motor Type	SP	SP	PSC	PSC	PSC	PSC
Motor HP	1/15	1/15	1/6	1/6	1/6	1/8
Motor RPM	1550	1550	1100	1100	1050	1625

Table 18.3 – Blower Model HDB Performance

	Model HDB Sizes
	60	75	100	125
Btu/Hr Input 1	60,000	75,000	100,000	125,000
Btu/Hr Output 1	49800	61,500	82,000	102,500
Entering Airflow Range (CFM)	635-1111	794-1389	1140-2116	1235-2058
Outlet Velocity (FPM)	437-726	546-908	443-781	488-773
Air Temp. Rise (°F)	40-70	40-70	35-65	45-75
Max. Mounting Height (Ft.) 2	7-13	7-16	8-19	8-17
Heat Throw (Ft.)(@ Max Mtg Ht.) 2	20-45	24-57	27-68	27-59
Motor Type	PSC	PSC	PSC	PSC
Motor HP	1/4	1/3	1/2	1/2
Motor RPM	Max 1100	Max 1100	Max 1100	Max 1100

1. Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea level. (In Canada see rating plate.) Reduction of ratings requires use of a high altitude kit.
2. Data taken at 55°F air temperature rise. At 65°F ambient and unit fired at full-rated input. Mounting height as measured from bottom of unit, and without deflector hoods.

DIMENSIONAL DATA – MODEL HD/HDB

Propeller Units – Model HD
Figure 19.1 – Dimensional Drawings – Model HD
Blower Units – Model HDB
Figure 19.2 – Dimensional Drawings – Model HDB
Table 19.1 – Dimensions (inches) – HD

Models	HD30	HD45	HD60	HD75	HD100/125
A	26.8	26.8	26.8	26.8	35.5
B	12.2	12.2	18.0	18.0	20.5
C	16.5	16.5	16.5	16.5	22.0
D	14.9	14.9	14.9	14.9	22.5
E	10.1	10.1	15.9	15.9	13.4
F	7.5	7.5	10.7	10.7	14.0
G	18.5	18.5	18.5	18.5	–
H	7.6	7.6	7.8	7.8	8.4
Gas Connection	1/2	1/2	1/2	1/2	1/2
I	34.5	34.5	34.5	34.5	43.0
J	22	22	25	25	31.0
Fan Diameter	10	10	14	14	18.0
Approx. Shipping Weight (lb6s.7)		72	92	97	143
Vent Connector Size (in) 3		3	3	3	4

Table 19.2 – Dimensions (inches) – HDB

Models	HDB60	HDB75	HDB100/125
A	26.8	26.8	35.5
B	18.0	18.0	20.5
C	16.5	16.5	22.0
D	14.9	14.9	22.5
E	15.9	15.9	18.4
F	10.7	10.7	14.0
G	18.5	18.5	–
H	7.8	7.8	8.4
Gas Connection	1/2	1/2	1/2
I	34.5	34.5	44.5
J	25.0	25.0	41.5
Blower	9 – 7	9 – 7	10 – 10
Approx.Shipping Weight (lbs.)	92	97	151
Vent Connector Size (in)	3	3	4

Table 19.3 – Clearance to Combustibles, Model HD/HDB

Unit Side	Clearance to Combustible Material		Recommended Service Clearance
	HD	HDB	HD/HDB
Top and Bottom	1″	6″	18″
Access Side	1″	6″	18″
Non-Access Side	1″	6″	18″
Rear	18″	18″	18″
Vent Connector	4″	4″	18″

Figure 19.3 – Mounting

SERVICE / MAINTENANCE / TROUBLESHOOTING

WARNING
When servicing or repairing this equipment, use only factoryapproved service replacement parts. A complete replacement parts list may be obtained by contacting the factory. Refer to the rating plate on the appliance for complete appliance model number, serial number, and company address. Any substitution of parts or controls not approved by the factory will be at the owner’s risk.
CAUTION

1. Service or repair of this equipment must be performed by a qualified service agency.
2. Do not attempt to reuse any mechanical or electrical controllers which have been wet. Replace defective controller.

IMPORTANT
To check most of the Possible Remedies in the troubleshooting guide listed in Table 20.1, refer to the applicable sections of the manual.

General Maintenance
The unit and venting system must be checked once a year by a qualified service technician.
All installation and service of these units must be performed by a qualified installation and service agency.
Before any service, BE SURE TO TURN OFF GAS AT THE MANUAL SHUT-OFF VALVE AHEAD OF THE COMBINATION GAS CONTROL AND TURN OFF ALL ELECTRIC POWER TO THE HEATER.

1. Service air moving components annually.
   a. Check fan for fit on motor shaft and for damage to blades.
2. Keep unit free from dust, dirt, grease, and foreign matter, paying particular attention to:
   a. Combustion air inlets.
   b. Burners and burner orifices. Turn off gas ahead of the combination gas control and shut off electric power to the heater. Remove the access panel, open the union on the gas line, and disconnect the igniter and sensor wires. Remove the screws that attach the burner tray to the header plate and remove the burner tray and manifold assembly from the heater. Carefully clean the burners with a wire brush or other suitable means. Replace any damaged or deteriorating burners or orifices. Install the burner assembly back on to the header making certain that all screws, pipes and electrical connections are tight.
   CAUTION: Be careful when handling the igniter and flame sensor.
3. Inspect the flame sensor and igniter for deterioration and/or cracks.
4. Verify that the burners are touching each other at the carryover points. This will ensure flame carryover from burner to burner.
   a. Clean exterior of heat exchanger tubes.
   b. Fan blades.
5. Check wiring for possible loose connections.
6. Controls – The gas valves and piping should be checked annually for general cleanliness and tightness. The gas controls should be checked to insure that the unit is operating properly. See control instruction sheets furnished separately with the unit heater.
7. Power exhaust assembly/motor – The power exhaust motor bearings have been lubricated for long life and do not require additional lubrication. In dirty environments, it may be desirable to clean the motors and blower housing and blow out the cooling air passages of the motor with compressed air.
8. Perform periodic cleaning of inlet and vent terminal screens.

Table 20.1 – Troubleshooting

TROUBLE	POSSIBLE CAUSE	POSSIBLE REMEDY
Unit does nothing	1. Power supply is off 2. No 24V power to thermostat 3. Thermostat malfunction 4. LED flashes 5. Blown fuse on control board 6. Defective control	1.  Turn on main power 2 a. Check control transformer b. If failed transformer – check thermostat wire gage and length 3 a. Verify wire connections to R&W terminals only b. Check / replace thermostat 4.Check LED flash code 5.Replace fuse 6.Replace control
LED light off or flashing	1. Blown fuse on control board 2. Multiple causes	1.Replace fuse 2. Control board LED flash codes vary with control type. A decal is installed in the unit giving a brief description of the applicable codes for your heater. For more detail, see the control board data sheet included with the unit.
Unit starts but does not ignite	1. Main gas is off 2. Air in gas line 3. Main or manifold gas pressure 4. Check gas valve switch	1.Open manual gas valve 2. Purge gas line 3. Set gas pressures per manual instructions 4. Set gas valve switch to “ON” position
Unit goes through cycle  but the burners go out in less then 10 seconds. Air circulating fan  inoperable	1. Reversed main power polarity 2. Unit not grounded 3. Flame not sensed 1. Loose connections 2. Defective control board 3. Defective fan motor	1.Black wire – HOT, White wire – NEUTRAL, Green wire – GROUND 2. Ground unit and verify quality of ground connection 3. Check flame sense probe and connection 1. Check all connections 2. Check control board data sheet and function 3.Check fan motor

UNIT WIRING

Wiring Diagram Selection
Since internal or factory wiring may vary depending on the controls manufacturer, the wiring diagrams must be appropriately selected with the proper gas valve and ignition type. The following wiring diagram represents a unit equipped with a single or two stage gas valve and direct spark ignition.
Figure 21.1 – Unit Heater Wiring Diagram (Single and Two Stage, Direct Spark Ignition)
SINGLE ST AGE, DIRECT SP ARK IGNITION, 100% SHUT OFF MUL TIPLE RETR Y W/AUT O RESET FROM LOCKOUTTWO ST AGE, DIRECT SP ARK IGNITION, 100% SHUT OFF MUL TIPLE RETR Y W/AUT O RESET FROM LOCKOUT

NOTES TO INSTALLER:

1. ALL WIRING MUST COMPLY WITH NATIONAL ELECTRIC CODE AND ALL LOCAL CODES.
2. ALL COMPONENTS MUST AGREE WITH THEIR RESPECTIVE POWER SOURCE.
3. VERIFY THE POWER SOURCE AND THE UNIT POLARITY.
4. USE TYPE 105°C REPLACEMENT WIRE 300V OR GREATER.
5. USED ON PROPELLER MODELS 100 AND LARGER.
6. TWO SWITCHES: 30-75, ONE SWITCH: 100-125 NOT USED ON 150-400 UNITS.

CAUTION:
FAILURE TO WIRE THIS UNIT ACCORDING TO THIS WIRING DIAGRAM MAY RESULT IN INJURY TO THE INSTALLER OR USER. FOR DEVIATIONS CONTACT THE FACTORY.
MOTOR LEAD COLOR FOR DIRECT DRIVE BLOWER MOTORS
WH-NEUTRAL
BL – MED
BK-HI
RED – LO
ATTACH WIRES NOT USED TO “PARK” TERMINALS UNITS ARE FACTORY WIRED FOR HIGH SPEED OPERATION.

MODEL & SERIAL NUMBER / REPLACEMENT PARTS

Figure 22.1 – Model Number Designations (Remove access cover to locate)Figure 22.2 – Serial Number Designations (Remove access cover to locate)Replacement Parts
When requesting parts please contact your local representative. Please have full model and serial number available. If you require assistance in locating your representative, please call the number located on the back page.

WARRANTY

This Warranty (the “Warranty”) shall apply to Products (as defined below) sold by Modine Manufacturing Company, a Wisconsin corporation (“Seller”) to you (“Buyer”).
Seller hereby warrants that during the Applicable Warranty Period (as defined below) its Products shall be free from defects in material and factory workmanship under normal use and service, subject to the EXCLUSIONS described below and according to the terms outlined in this Warranty.
If Seller receives written notice of a breach of this Warranty prior to the end of the Applicable Warranty Period (which such notice shall include the model and serial numbers of the Product, as well as the date and a reasonably detailed description of the  Product’s alleged failure), Buyer shall with Seller’s prior written approval, return the applicable Product or component thereof to Seller with shipping charges prepaid; if upon examination by Seller such Product or component thereof is disclosed to have been  defective, then Seller will, without charge to Buyer, at Seller’s option, either repair the Product, replace defective parts in the Product, or offer an entire replacement unit of the Product; provided that the warranty period for a Product that has been repaired or provided with replacement parts shall not extend beyond the original Applicable Warranty Period, nor shall any replacement parts provided for a Product be under any warranty beyond the original Applicable Warranty Period for the Product; similarly, if Seller provides an entire replacement unit of the Product, the warranty period for the replacement unit is limited to the remainder of the original Applicable Warranty Period. Seller shall have no responsibility for installation, service, field labor, shipping, handling, or other costs or charges, except as expressly provided in this Warranty. Buyer shall have no remedy hereunder for any defective part returned without proper written authorization from Seller, as described above.
For purposes of this Warranty and subject to the exclusions described below, the term “Products” shall mean parts or equipment manufactured by Seller, sold to Buyer pursuantto a purchase contract between Buyer and Seller (most often initiated by a purchase order issued by Buyer and accepted by Seller), and expressly described in such contract. The term “Products” shall not include third-party parts or equipment furnished by Seller, except that, to the extent assignable, Seller will assign to Buyer the benefits (together with all limitations and exclusions) of the thirdparty manufacturer’s warranty for such parts or equipment. This Warranty extends only to the original purchase contract between Buyer and Seller and is nontransferable, except that this Warranty may be
assigned to an Authorized End User (as defined below). All replaced parts or equipment shall become Seller’s property. For purposes of this Warranty, the term “Applicable Warranty Period” shall mean the warranty period set forth in the table below for each type or class of Product described on the table; provided that, when the Product is to be used as a component part of equipment manufactured by Buyer, the Applicable Warranty Period shall be limited to one (1) year after the date of shipment from Seller, notwithstanding anything in the table below to the contrary. For purposes of this Warranty, the term “Authorized End User” shall mean any third-party that purchases the Product directly or indirectly from Buyer for the Authorized End User’s own use upon the first installation of the Product and not for resale.
BUYER HEREBY ACKNOWLEDGES THAT ITS REMEDIES FOR BREACH OF THIS WARRANTY, EXCLUSIVE OF ALL OTHER REMEDIES PROVIDED BY LAW, ARE LIMITED AS DESCRIBED ABOVE.
EXCLUSIONS AND LIMITATIONS: This Warranty is subject to the following exclusions and limitations:
The term “Products” shall not include and this Warranty shall not apply to any of the following items: refrigerant gas, belts, filters, fuses and other items consumed or worn out by normal wear and tear.
In addition, this Warranty shall not apply to:

1. Products or components thereof that are damaged or adversely affected by conditions beyond Seller’s control, including but not limited to polluted or contaminated or foreign matter contained in the air or water utilized for heat exchanger (condenser) cooling or if the failure of the part is caused by improper air or water supply, or improper or incorrect sizing of power supply;
2. Any Products or components thereof which have been repaired or altered outside the factory of Seller in any way, or otherwise subject to unauthorized repairs or alterations, so as, in the judgment of Seller, to affect the Product’s durability or performance;
3. Materials or labor of any kind not furnished by Seller, or any charges for any such labor or materials, whether such labor, materials or charges thereon are due to replacement of parts, adjustments, repairs, or any other work done by any party other than Seller;
4. Labor or other costs incurred for diagnosing, repairing, removing, installing, shipping, servicing, or handling of either defective or replacement parts;
5. Any Products removed from their original location for reinstallation in another location;
6. Any Products or components thereof which have been operated, maintained, or serviced contrary to Seller’s written installation, operation, and/or servicing instructions or owner’s manual;
7. Damages resulting from operation with an inadequate or interrupted supply of air or water;
8. Any Products or components thereof which have been subjected to misuse, negligence, faulty installation, improper servicing, accident, excessive thermal shock, excessive humidity, physical damage, impact, abrasion, improper operation, or other operating conditions in excess of or contrary to those for which such equipment was designed;
9. With respect to gas-fired or oil-fired units, any Products or components thereof if the input to the Product exceeds the rated input (as indicated on the Product’s serial plate) by more than five percent (5%);
10. Any Products or components thereof which, in the judgment of Seller, have been installed in a corrosive atmosphere, marine, or coastal application, subjected to corrosive fluids or gases, or damaged or adversely affected by the effects of the physical or chemical properties of water or steam or other liquids or gases used in the Products or any component thereof;
11. Damage or failure to start resulting from improper voltage conditions, blown fuses, open circuit breakers, or other inadequacy or interruption of electrical service or fuel supply; or
12. Any Products or components thereof from which the serial number has been altered, defaced or removed.

BUYER AGREES THAT THE WARRANTIES AND REMEDIES DESCRIBED HEREIN ARE THE ONLY WARRANTIES AND REMEDIES PROVIDED BY SELLER WITH RESPECT TO THE PRODUCTS AND TO THE MAXIMUM EXTENT PERMITTED UNDER APPLICABLE LAW SHALL BE IN LIEU OF AND EXCLUSIVE OF ALL OTHER WARRANTIES AND REMEDIES WHATSOEVER, EITHER EXPRESS OR IMPLIED, WHETHER ARISING FROM LAW, COURSE OF DEALING, USAGE OF TRADE, OR OTHERWISE, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT, EACH OF WHICH SELLER HEREBY EXPRESSLY DISCLAIMS. SELLER NEITHER ASSUMES (NOR HAS AUTHORIZED ANY PERSON TO ASSUME) ANY OTHER WARRANTY OR LIABILITY IN CONNECTION WITH ANY PRODUCTS. REPRESENATATIONS AND CONDITIONS, EXPRESS OR IMPLIED BY STATUTE, TRADE USAGE, OR OTHERWISE, ARE EXCLUDED AND WILL NOT APPLY TO THE PRODUCTS UNDER THIS WARRANTY, EXCEPT FOR WARRANTIES WHICH BY LAW CANNOT BE EXCLUDED OR LIMITED.
Without limiting the foregoing, Seller makes no and specifically disclaims all representations and/or warranties that the Products will detect the presence of, or eliminate, prevent, treat, or mitigate the spread, transmission, or outbreak of any pathogen, disease,  virus, or other contagion, including but not limited to COVID 19.
BUYER AGREES THAT IN NO EVENT WILL SELLER BE LIABLE FOR COSTS OF PROCESSING, LOST REVENUES OR PROFITS, INJURY TO GOODWILL, OR ANY OTHER SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES OF ANY KIND RESULTING FROM THE PURCHASE OF THE PRODUCTS, OR FROM BUYER’S USE OF ANY PRODUCT, WHETHER ARISING  FROM BREACH OF WARRANTY, NONCONFORMITY TO ORDERED SPECIFICATIONS, DELAY IN DELIVERY, OR ANY OTHER LOSS SUSTAINED BY THE BUYER.
OPTIONAL SUPPLEMENTAL WARRANTY
Buyer may purchase from Seller a supplemental warranty with respect to Products which shall extend the Applicable Warranty Period as set forth in the express terms and conditions described in the supplemental warranty agreement. Such supplemental warranty terms may include an additional four (4) years on certain compressors, an additional five (5) years “all parts” warranty, an additional four (4) or nine (9) years on certain heat exchangers, and/ or such additional supplemental warranty terms as Seller chooses to make available to its customers from time to time.

COMPONENT	APPLICABLE MODELS		APPLICABLE WARRANTY PERIOD (WHICHEVER OCCURS FIRST)
			Time from Date of First Beneficial Use by Buyer or Authorized End User	Time from Date of Shipment from Seller
Heat Exchangers and/or Coils	Gas Fired Unit Heaters with Tubular Style Heat Exchangers (e.g. HD, HDS, PTX, BTX, etc)	Aluminized or Stainless Steel	10 YEARS	126 MONTHS
	Gas Fired Unit He aters with Clam-Shell Style Heat Exchangers (e.g. PDP, BDP, etc.)	Aluminized Steel(not in high- humidity applications)	10 YEARS (must be Stainless Steel in high-humidity applications)	126 MONTHS
		Aluminized Steel (in high-humidity applications)	1 YEAR	18 MONTHS
		Stainless Steel	10 YEARS	126 MONTHS
	Low Intensity Infrared Units		5 YEARS	66 MONTHS
	Indoor and Outdoor Duct Furnaces and System Units, Steam/Hot Water Units, Oil-Fired Units, Electric Units, Cassettes, Vertical Unit Ventilators, Geothermal Units		1 YEAR	18 MONTHS
Burners and Elements	Low Intensity Infrared Units		2 YEARS	30 MONTHS
	High Intensity Infrared and Electric Infrared Units		1 YEAR	18 MONTHS
Compressors	Condensing Units for Cassettes		5 YEARS	66 MONTHS
	Vertical Unit Ventilators, Geothermal Units		1 YEAR	18 MONTHS
Sheet Metal Parts	All Products		1 YEAR	18 MONTHS
Components, excluding Heat Exchangers, Coils, Condensers, Burners, Sheet Metal	All Products		2 YEARS	30 MONTHS

As Modine Manufacturing Company has a continuous product improvement program, it reserves the right to change design and specifications without notice.

© Modine Manufacturing Company 2024
Modine Manufacturing Company
1500 DeKoven Avenue
Racine, WI 53403
Phone: 1.800.828.4328 (HEAT)
www.modinehvac.com

Documents / Resources

MODINE HDB Gas Fired Unit Heaters [pdf] User Manual HD, HDB, HDB Gas Fired Unit Heaters, HDB, Gas Fired Unit Heaters, Fired Unit Heaters, Unit Heaters, Heaters

References

• User Manual