LENNOX MPC Outdoor Units Instruction Manual

Instruction Manual for LENNOX models including: MLB, MPC Outdoor Units, MPC, Outdoor Units

Lennox Technical Publications

MLB and MPC Single-Zone Heat Pump with M22A, M33C Indoor Cassette Unit

Technical | Commercial HVAC Tech Support | Lennox Commercial

File Info : application/pdf, 36 Pages, 7.64MB

507546-08

INSTALLATION INSTRUCTIONS
MLB/MPC Outdoor Units with M22A/M33C Indoor
Units
SINGLE-ZONE MINI-SPLIT SYSTEMS (208/230V) -- Cassette-Mounted Indoor Unit 507546-08 10/2021 Supersedes 507546-07

Table of Contents
General ....................................................................................1 Included Parts.........................................................................2 Model Number Identification .................................................3 Indoor / Outdoor Unit Match-Ups..........................................4 Typical System Components.................................................5 System Dimensions ...............................................................6
Outdoor Units.................................................................................................... 6
Indoor Units..................................................................................................... 10
System Clearances...............................................................12
Outdoor Unit.................................................................................................... 12
Indoor Unit ...................................................................................................... 12
Torque Requirements for Caps and Fasteners..................13 Indoor Unit Installation ........................................................13
Unit Placement Considerations....................................................................... 13
Installation of Cassette Base .......................................................................... 13
Installation of Cassette Cover Panel............................................................... 14
Indoor Unit Condensate Piping Connections .................................................. 16
Outdoor Unit Installation .....................................................16
Placement Considerations .............................................................................. 16
Direct Sunlight, Rain, Snow and Ice Protection .............................................. 17
Prevailing Winds ............................................................................................. 18
Buried Refrigerant Pipe Protection ................................................................. 18
Outdoor Unit Condensate Piping .................................................................... 18
Securing the Outdoor Unit .............................................................................. 19
Refrigerant Piping Connections..........................................19
Leak Test and Evacuation............................................................................... 22
Leak Test......................................................................................................... 22
Triple Evacuation Procedure........................................................................... 22
Wiring Connections..............................................................22
Outdoor Unit ................................................................................................... 22
Indoor Unit ...................................................................................................... 23
Wiring Requirements ...................................................................................... 24
Indoor Unit Control Board Wiring Connections ............................................... 25
Outdoor Unit Control Board Wiring Connections ............................................ 26
Unit Start-Up .........................................................................32 Adding Refrigerant for Longer Line Set .............................32 Self Clean Feature ................................................................32 Test Run ................................................................................32
Pre-Checks ..................................................................................................... 32
Procedure ....................................................................................................... 32
Troubleshooting ...................................................................33 Dry Mode Operation (Dehumidification).............................34
Procedure ....................................................................................................... 34
Sequence of Operation ................................................................................... 34

THIS MANUAL MUST BE LEFT WITH THE OWNER FOR FUTURE REFERENCE
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) or a service agency.
WARNING
The clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs, and HFCs) as of July, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for non-compliance.
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.
General
Refer to the Product Specifications bulletin (EHB) for more product information. These instructions are intended as a general guide and do not supersede local or national codes in any way. Authorities having jurisdiction should be consulted before installation. The M22A and M33C ceiling cassette indoor units are matched with an outdoor heat pump unit to create a minisplit system that uses HFC-410A refrigerant.

Included Parts

Package 1 of 1 contains the following: 1 - Assembled Indoor Unit The assembled indoor unit will include the following items:

Parts

Figure

Quantity

Parts

Wireless controller

Installation and owner's manual

Wireless control holder with two mounting screws
Batteries (AAA)

Paper template for installation

3/4" Drain Adapter with two band claps.

Conduit Installation Plate

1 - Assembled Outdoor Unit and the following items:

Parts

Figure

Quantity

Drain connector

Model Number Identification

Parts Seal ring

Figure Figure

Quantity 1 1 1
Quantity 1

CASSETTE NON-DUCTED INDOOR UNITS
M 33 C 012 S 4 - 1 P

Series Type M = Mini-Split

Voltage P = 208/230V-1 phase-60hz

Unit Type 22 = 2x2 Cassette Non-Ducted Unit 33 = 3x3 Cassette Non-Ducted Unit
Major Design Sequence C = 3rd Generation

Minor Design Sequence 1 = 1st Revision 2 = 2nd Revision
Refrigerant Type 4 = HFC-410A

Nominal Cooling Capacity 009 = .75 tons 012 = 1 tons 018 = 1.5 tons 024 = 2 tons 036 = 3 tons 048 = 4 tons

Cooling Efficiency S = Standard Efficiency

OUTDOOR HEAT PUMP UNITS

M P C 009 S 4 S - 1 P

Series Type M = Mini-Split

Voltage P = 208/230V-1 phase-60hz

Unit Type L = Low Ambient Heat Pump
P = Heat Pump

Minor Design Sequence 1 = 1st Revision

Major Design Sequence C = 3rd Generation

Refrigerant Circuits S = Single Circuit

Nominal Cooling Capacity 009 = 0.75 tons 012 = 1 tons 018 = 1.5 tons 024 = 2 tons 030 = 2.5 tons 036 = 3 tons 048 = 4 tons

Refrigerant Type 4 = HFC-410A
Cooling Efficiency S = Standard Efficiency

Indoor / Outdoor Unit Match-Ups

Outdoor Unit MPC009S4S-*P MPC012S4S-*P MPC018S4S-*P MPC024S4S-*P MPC036S4S-*P MPC048S4S-*P

Table 1.

Indoor / Outdoor Match-ups
Indoor Unit Match-Up M22A009S4-*P M22A012S4-*P M22A018S4-*P M33C024S4-*P M33C036S4-*P M33C048S4-*P

MLB009S4S-*P MLB012S4S-*P MLB018S4S-*P MLB024S4S-*P MLB036S4S-*P MLB048S4S-*P

M22A009S4-2P M22A012S4-2P M22A018S4-2P M33C024S4-2P M33C036S4-2P M33C048S4-2P

Voltage 208/230V 208/230V 208/230V 208/230V 208/230V 208/230V
208/230V 208/230V 208/230V 208/230V 208/230V 208/230V

Typical System Components
M22A Display

Not Applicable LED display
Timer indicator

M33C Display
Alarm indicator Not Applicable

Operation indicator

PRE-DEF indicator (pre-heating/defrost)
Lorem ipsum

IMPORTANT - Condensate drain line must always
be located at the bottom of the bundle.)

Wiring

Line set (wrapped in foam insulation)

Communication cable 036 and 048 only Tape Condensate drain line (wrapped in foam insulation)
Refrigerant Line Set, Condensate Line And Indoor / Outdoor Cable (field-provided)

Utility Bundle

UV-rated tape (field-provided)

IMPORTANT - The refrigerant metering device for this system is located in the outdoor unit. This makes it necessary to insulate the refrigerant lines individually to prevent sweating.

208/230V Outdoor Unit Terminal Block

1 2 3 L1 L2

Access cover for power and control wiring connections
Condensate drain line (field-provided)

To Indoor Unit

To Power Supply

Communication Cable 036 and 048 only

GRAY YELLOW

XT2 S1 S2
TO INDOOR COMM. BUS NOTEUse 2-conductor shielded wire

Figure 1. Typical M33C Single Zone System Shown

System Dimensions Outdoor Units

DRAIN HOLE (Bottom of Unit)
3/8 (10) 1-1/2 (62)
11-1/4 (286) 12-3/8 (314)

3/4 (19) 3 (76)

TOP VIEW
30-7/8 (784)

17-3/4 (451) 30-1/8 (765)
32-7/8 (835)
FRONT VIEW

21-7/8 (556)

GAS VALVE LIQUID VALVE

2-3/8 (60) 3-3/4 (95)
11-7/8 (302)
SIDE VIEW

Figure 2. MPC009S4S-*P and MPC012S4S-*P - Unit Dimensions - inches (mm)
1/2 (13)

13-3/4 (349)
15 (381)

2-7/8 (73)

TOP VIEW

35-1/4 (895)

12-3/4 (324)
2-7/8 (73)

26-1/8 (664) 35 (889) 37-5/8 955)
FRONT VIEW

26-1/2 (673)

GAS VALVE LIQUID VALVE
2-3/8 (60) 4-1/4 (108)
13-1/2 (343)
SIDE VIEW

Figure 3. MPC018S4S-*P - Unit Dimensions - inches (mm)

15-7/8
(403) 18
(457)

18-1/8 (460)

DRAIN HOLE (Bottom of Unit)
3-5/8 (92)

15-1/4 (387)

1 (25)

TOP VIEW 2-7/8 (73)
40-1/2 (1029)

26-1/2 (673) 37-1/4 (946)
FRONT VIEW

31-7/8 (810)

GAS VALVE LIQUID VALVE

2-3/8 (60) 4-1/4 (108)
16-1/8 (410)
SIDE VIEW

Figure 4. MPC024S4S-*P and MPC036S4S-*P- Unit Dimensions - inches (mm)
27-7/8 (708) 25 (635)

15-7/8 (403)

17-5/8 (448)

3
(76) TOP VIEW

16-3/8 (416)

44-5/8 (1134)

37-1/2 (953) 41-1/8 (1045)
FRONT VIEW

SIDE VIEW

Figure 5. MPC048S4S-*P- Unit Dimensions - inches (mm)

DRAIN HOLE (Bottom of Unit)
1 (25)

12-1/8 (308)

1-7/8 (48)

17-3/4 (450)

1-1/2 (32)

TOP VIEW
32 (813)

12-1/2 (318)
13-5/8 (346)

20-1/8 (511) 31-3/4 (806) 34-3/8 (873)
FRONT VIEW

21-7/8 (556)

GAS VALVE LIQUID VALVE

2-3/8 (60) 3-3/4 (95) 13 (330)
SIDE VIEW

Figure 6. MLB009S4S-*P and MLB012S4S-*P - Unit Dimensions - inches (mm)
1/2 (13)

13-3/4 (349)
15 (381)

2-7/8 (73)

TOP VIEW

35-1/4 (895)

12-3/4 (324)
2-7/8 (73)

26-1/2 (673)

GAS VALVE LIQUID VALVE

2-3/8 (60)
4-1/4 (108)

26-1/8 (664) 35 (889) 37-5/8 955)

13-1/2 (343)
SIDE VIEW

FRONT VIEW
Figure 7. MLB018S4S-*P - Unit Dimensions - inches (mm)

15-7/8
(403) 18
(457)

18-1/8 (460)

DRAIN HOLE (Bottom of Unit)
3-5/8 (92)

15-1/4 (387)

1 (25)

TOP VIEW 2-7/8 (73)
40-1/2 (1029)

31-7/8 (810)

GAS VALVE LIQUID VALVE

26-1/2 (673) 37-1/4 (946)
FRONT VIEW

2-3/8 (60) 4-1/4 (108)
16-1/8 (410)
SIDE VIEW

Figure 8. MLB024S4S-*P - Unit Dimensions - inches (mm)

27-7/8 (708) 25 (635)

15-7/8 (403)

17-5/8 (448)

3
(76) TOP VIEW

16-3/8 (416)

44-5/8 (1134)

37-1/2 (953) 41-1/8 (1045)
FRONT VIEW

SIDE VIEW

Figure 9. MLB036S4S-*P and MLB048S4S-*P- Unit Dimensions - inches (mm) 9

Indoor Units

DRAIN CONNECTION
GAS PIPE
LIQUID PIPE

SIDE VIEW

10-3/8 (264)

Fresh Air Intake

20-5/8 (524)

22-1/2 (572)

LEFT SIDE VIEW

21-1/2 (546) 22-1/2 (572)
BOTTOM VIEW (Body)

RIGHT SIDE VIEW

INSTALLATION HANGERS

LEVELING ADJUSTMENT
NUT (4)
CEILING
AIR OUTLET

DIFFUSER PANEL

AIR INLET

23-5/8 (600) (Ceiling Opening)
SIDE VIEW

AIR OUTLET

25-1/2 (648)
25-1/2 (648)
BOTTOM VIEW (Panel)
Figure 10. M22A Indoor Cassette Unit Dimensions - inches (mm)

ELECTRICAL INLET

CONDENSATE PUMP CONNECTION
HANGING BRACKETS (4)

30-3/8 (772)

26-3/8 (670)

CONTROL BOX

LIQUID PIPE

GAS PIPE

26-3/8 (670)
32-5/8 (829)
Fresh Air Intake (NOTE - Not Used)

LEFT SIDE VIEW

DRAIN CONNECTION

32-5/8 (829)
BOTTOM VIEW (Body)
5-5/8 (143)

3-7/8 (98)

AIR OUTLET

DIFFUSER PANEL

AIR INLET
SIDE VIEW

4 (102)

5-1/2 (139)

AIR OUTLET

RIGHT SIDE VIEW

37-3/8 (949)
37-3/8 (949) BOTTOM VIEW (Panel)
Figure 11. M33C Indoor Cassette Unit Dimensions - inches (mm)

System Clearances Outdoor Unit
24 (610)

12 (305)

24 (610)

79 (2007)
Air Outlet

1 Minimum rear clearance can be 6 inches (152 mm) when mounted on brackets and with no obstructions on the other three sides.

Indoor Unit

Figure 12. Outdoor Unit Clearances - inches (mm)

Air Inlet
1 12 (305)

INSTALLATION HANGERS

LEVELING ADJUSTMENT
NUT (4)
CEILING
AIR OUTLET

DIFFUSER PANEL

AIR INLET

23-5/8 (600) (Ceiling Opening)

AIR OUTLET

36" (914 mm)

Cassette

36" (914 mm)

Minimum Clearance from Structural Ceiling to Drop Ceiling: M22A009, M22A012, M22A018, M33C024 -- 10-1/4" (260 mm)
M33C036, M33C048 -- 13" (330 mm)
Minimum Clearance to Floor - 98-1/2" (2500 mm)
Figure 13. Indoor Unit Clearances - M22A and M33C - inches (mm)

Torque Requirements for Caps and Fasteners

When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. "Table 2. Torque Requirements" on page 13 provides torque values for fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc - Rockwell Harness Scale minimum). Fully insert the wrench into the valve stem recess.
Service valve stems are factory-torqued from 9 ft.-lbs. (12 N) for small valves, to 25 ft.-lbs. (34 N) for large valves) to prevent refrigerant loss during shipping and handling. Using an Allen wrench rated at less than 50Rc risks rounding or breaking off the wrench, or stripping the valve stem recess.
See the Lennox Service and Application Notes C-08-1 for further details and information.

Table 2.
Parts
Service valve cap Sheet metal screws Machine screws #10 Compressor bolts Gauge port seal cap

Torque Requirements

Recommended Torque

U.S.

Newton-Meter- N

8 ft.-lb.

16 in.-lb.

27 in.-lb.

7 ft.-lb.

8 ft.-lb.

Indoor Unit Installation

CAUTION
In order to avoid injury, take proper precaution when lifting heavy objects.
Unit Placement Considerations
AVOID Do not install the unit in the following locations: · Areas exposed to petrochemicals or petrochemical
products
· Areas exposed to salt or other corrosive materials or caustic gases
· Areas exposed to extreme voltage variations (such as factories
· Tightly enclosed areas that may impede service of the unit
· Areas exposed to fossil fuels (such as oil or gas in kitchens)
· Areas exposed to strong electromagnetic forces
· Areas exposed to acids or alkaline detergents

DO
· Place the unit so that it is not exposed to direct sunlight
· Ensure the structural ceiling can support the weight of the unit
· Select a location where the condensate line will have the shortest run to a suitable drain per local codes.
· Allow sufficient space around unit for proper operation and maintenance
· Install unit a minimum of 3 feet (1m) away from any antenna, power cord (line) radio, telephone, security system, or intercom. Electrical interference and radio frequencies from any of these sources may affect operation
· Be sure to instruct customers how to properly operate the unit (especially maintenance of air filter, and operation procedure) by having them carry out operations themselves while looking at the manual provided with the controller
Installation of Cassette Base
It is important to place the cassette unit in the center of the area that is being conditioned. This will provide the best air distribution.
1. If the unit is to be installed in an application that includes a drop-down tile ceiling, remove the ceiling tiles necessary to accommodate installation of the four-way cassette. Before removing the drop ceiling support grid, use a plumb line or laser device to identify the center point of the structural ceiling. Make sure that the ceiling is supported before removing any of the support grid. It may be necessary to add extra support to maintain the structural integrity of the drop ceiling.
2. If the unit is to be installed in an application that includes a sheet rock (plasterboard) ceiling, the installation site must be carefully measured and the sheet rock must be cut to accommodate the cassette unit. First, identify the center point of the installed cassette. Use a plumb line to transfer the center mark to the floor for future use. Use the provided template to mark the area of the required opening. Carefully cut the required opening. Make sure that the removal of the required ceiling support does not affect the structural integrity of the ceiling. It may be necessary to add extra support.
3. Use the unit as a template or use the provided paper template to mark the location of the hanging brackets on the floor. Use a plumb line or a laser to transfer the bracket positions to the main structural ceiling.
4. Make sure that the structural ceiling is able to support the weight of the cassette unit. It may be necessary to add extra support. If the structural ceiling is constructed of concrete, install anchors to accept four " threaded rods to suspend the cassette base. If the structural ceiling includes wooden joists, use angle

iron or a Unistrut channel fixed securely in place to accept the " threaded rods.
5. Slide one nut and one washer onto each threaded rod. Use electrical tape to keep the washer from failing off. Position the nuts slightly above the final resting place of the four suspension brackets.

CONCRETE CEILING USING ANCHORS

" THREADED ROD

ANCHOR

ANGLE IRON BOLTED IN PLACE ACROSS WOODEN JOISTS

" THREADED ROD

ANGLE IRON ACROSS
WOODEN JOISTS

WOODEN JOIST

Installation of Cassette Cover Panel
The M33 cassette cover panel is not included and is order separately. Please refer to the product specification (EHB) for catalog number for ordering.
IMPORTANT
Do not place the cover panel with the diffusers face down on the floor or other surface. Louvers will be damaged if pressure is applied to them.
1. Carefully remove the cassette cover panel from its protective packaging and place the panel diffuserside-out on a clean, level surface.
2. Press the two grille latch release buttons at the same time to release the grille as illustrated in "Figure 16. Remove Return Air Grille". Tilt the return air grille outward at a 45º angle and lift the grille away from the panel. Carefully place the return air grille off to the side.

Figure 14. Suspending Methods
6. Use either a mechanical lifting device or a minimum of two people to raise the unit and insert the threaded rods into the suspension brackets on the cassette base. Slide a washer and then a nut onto each rod below each suspension bracket. Use the leveling nut (beneath suspension bracket) to adjust the cassette base to the correct height. Remove the electrical tape holding the upper washers and nuts in place and tighten each of the four nuts above the brackets down onto the brackets. This will ensure that the unit remains level.
7. If the unit is being installed in an application that includes a sheet rock (plasterboard) ceiling, it is recommended to install an access panel in a suitable location to allow final connection of the refrigerant piping, condensate line and electrical connections. This will also allow access for future maintenance. If this is not possible, make final connections before installing cassette cover panel.
" THREADED ROD
CASSETTE BASE

45º

LATCH RELEASE BUTTONS
Press latch release buttons at the same time to release latch.
Tilt return air grille outward, then, lift to remove grille from panel.
Figure 16. Remove Return Air Grille 3. Remove access covers from each corner of the panel.
CORNER ACCESS COVER
Remove screws and loosen straps to remove corner covers from panel.

L " to ½"

LEVELING NUT

DROP CEILING

SUSPENSION BRACKET

Figure 15. Suspending Hardware

Figure 17. Remove Corner Covers

REFRIGERANT PIPING CONNECTIONS
CONDENSATE DRAIN
CONNECTION

PANEL HANGER

CASSETTE BASE HOOK
DETAIL A

DETAIL B

DETAIL C

COVER PANEL

SECURING

SCREW

LOUVER SWING MOTORS

COVER PANEL

PHILLIPS SCREWDRIVER

Figure 18. Install Cover Panel
4. Position the ceiling panel so that the arrow on the panel is aligned with the arrow sticker on the cassette base (both arrow stickers should be on the same side of the cassette base).
NOTE: If the panel and the base are not properly aligned, the airflow will be blocked and the harness plugs from the panel to the cassette base will not be long enough to plug together.
5. Place the cover panel hangers on the two corners with the louver swing motors. Place these two hangers on the corresponding hooks on the corners of the cassette base. See detail A in "Figure 18. Install Cover Panel". Then, place the other hangers from the other two corners over their corresponding hooks on the cassette base as shown in detail B in "Figure 18. Install Cover Panel".
6. Connect the six-pin harness plugs from each of the two swing motors to the matching six-pin plugs from the control box in the cassette base.
7. Connect the black harness from the display on the cover panel to the corresponding black plug from the control box in the cassette base.
8. Connect the black two-pin plug from the temperature sensor to the corresponding black plug from the control box in the cassette base.
9. Tighten the provided screws in the bracket in the cover panel immediately below each panel hanger. See detail C in "Figure 18. Install Cover Panel". Adjust the cover panel by turning slightly clockwise, if necessary, to make sure that the panel is properly aligned with the cassette base.

" THREADED
ROD

7/8 (22 mm)

5-3/4 (146)

LEVELING NUT

CEILING COVER PANEL
Side View Cutaway
CASSETTE BASE CEILING

CASSETTE UNIT BASE
FOAM INSULATION

5/32-1/4 (4-6 mm)

1-7/8 (48 mm)

FOAM INSULATION
COVER PANEL

air out

SUPPLY AIR LOUVER

Figure 19. Cover Panel in Place
11. Continue to tighten the cover panel securing screws until the insulation between the cover panel and the cassette base has been compressed to approximately ¼" (6 mm). The cover panel must form a seal with the ceiling and the cassette base around the entire perimeter of the unit.

LOOSEN UPPER NUT

CORNER PANEL

TIGHTEN LOWER NUT
Figure 20. Adjust Unit Height through Corner Panel
12. If it is necessary to adjust the cassette height after the cover panel has been installed, access the leveling nut through the removable access cover on each corner.
13. The return air grille must be reinstalled on the cover panel. Align the four tabs on the grille with the four slots in the cover panel. Tilt the panel back into place. Press the opposite side of the cover gently until the latches engage.

Indoor Unit Condensate Piping Connections
IMPORTANT
Make sure that drain piping is properly routed and insulated to prevent both leaks and condensation.
1. Use a field-provided hose clamp to secure the drain line stub on the side of the cabinet to a field-supplied 1-inch (25 mm) drain line.
NOTE: Take care not to over-tighten the hose clamps this may damage the drain line stub.
NOTE: Connection between stub and drain line must be watertight. Apply non hardening plumbing joint compound if needed to ensure a watertight seal.
2. Confirm proper slope (not less than 1/4 inch per foot (18 mm per m)) and routing of condensate lines to ensure moisture is drained away from the indoor unit.
3. Drain should be as short as possible and should not have any droops or kinks that would restrict condensate flow and shall be approved resistant pipe. There must be a 2-inch (51 mm) space between the end of the condensate drain and the final termination point (ground, open drain, etc.) to ensure that the line will drain freely.
4. After the system installation is complete, the condensate drain line must be checked for leaks and proper drainage. If a field-provided condensate pump has been installed, it must be checked to ensure proper operation. This check is part of the start-up process which must be done by the installing contractor.
IMPORTANT
Drain should have a slope of at least ¼ inch per foot and should be approved corrosion-resistant pipe. You must confirm operation of every drain and pump in the system as part of the commissioning procedure.
Cap (Remove for test)

7-7/8in. 2~3-15/16 in.

3 ft. (1 m)

Max. 27-1/2"

Cassette Unit

SUPPORT STRAPS

Drain (slope of at least ¼ inch per foot)

Figure 22. Indoor Unit Condensate Drain

Outdoor Unit Installation

CAUTION
In order to avoid injury, take proper precaution when lifting heavy objects.
Placement Considerations
Consider the following when positioning the unit: · In coastal areas or other places with salty atmosphere
of sulfate gas, corrosion may shorten the life of the unit. In coastal areas, the coil should be cleaned with potable water several times per year to avoid corrosive buildup (salt)
· Some localities are adopting sound ordinances based on the unit's sound level registered from the adjacent property, not from the property where the unit is installed. Install the unit as far as possible from the property line
· When possible, do not install the unit directly outside a window. Glass has a very high level of sound transmission.
· Install unit level
Building Structure

Cassette Base Drain Pan

Pour water here for test

Drain Plug
Figure 21. Test Condensate Drain

Ground Level
Figure 23. Install Unit Level · Choose a place solid enough to bear the weight and
vibration of the unit, where the operation noise will not be amplified · Choose a location where the hot air discharged from the unit or the operation noise will not be a nuisance to neighbors
16

· Avoid installing the outdoor unit near a bedroom or other places where noise may cause a problem
· There must be sufficient space to carry the unit into and out of the site
· There must be unobstructed air flow around the air inlet and the air outlet
· The unit must not be installed in areas where a flammable gas leak may occur
· Install the outdoor unit a minimum of 3 feet (1m) away from any antenna, power cord (line), radio, telephone, security system, or intercom. Electrical interference and radio frequencies from any of these sources may affect operation
· Since water drains from the outdoor unit during various stages of operation, do not place anything which may be damaged by moisture under the unit
Direct Sunlight, Rain, Snow and Ice Protection
· If the outdoor unit is subjected to prolong exposure to direct sunlight with temperatures over 100°F (38°C) a canopy is recommended as illustrated in "Figure 24. Outdoor Unit on Pedestal (Stand) and Protective Canopy" or "Figure 29. Dog House-Style Shelter" on page 18.
IMPORTANT
The construction of a canopy or shade is necessary because of an ambient limit control set to 122°F (50°C) to protect the electronics. If the outdoor unit is placed in direct sunlight it is possible that the limit may activate and shut down the unit.
· Place unit away from overhanging roof lines which would allow water or ice to drop on, or in front of, coil or into unit. Construct a canopy as illustrated in "Figure 24. Outdoor Unit on Pedestal (Stand) and Protective Canopy"
· The unit base should be elevated above the depth of average snows as illustrated in "Figure 25. Outdoor Unit on Brackets above Snow Line"
· In heavy snow areas, do not place the unit where drifting will occur as illustrated in "Figure 26. Outdoor Unit Air Flow Obstructed by Snow"
· Carefully consider how to manage defrost water disposal to prevent ice from blocking walkways or creating a safety hazard near the outdoor unit as illustrated in "Figure 27. Avoid Defrost Water Ice Hazard"

Protective canopy

Air Outlet
Pedestal (stand)

12 in 305 mm
Air Inlet

24 in 610 mm
Pedestal (stand)

Side View

Front View

Figure 24. Outdoor Unit on Pedestal (Stand) and Protective Canopy

Air Outlet

Air Inlet

Figure 25. Outdoor Unit on Brackets above Snow Line

79 in 2007 mm
Air Outlet

12 in 305 mm
Air Inlet

Figure 26. Outdoor Unit Air Flow Obstructed by Snow
17

12 in 305 mm

24 in 610 mm

12 in 305 mm

Figure 27. Avoid Defrost Water Ice Hazard
Prevailing Winds
Normally wind baffles are not required for a outdoor unit. However, in order to maximize reliability and performance, the following best practices should be followed.
If unit coil cannot be installed away from prevailing winter winds, some method of protecting the coil is recommended. However, minimum clearances as reference in "Figure 12. Outdoor Unit Clearances - inches (mm)" on page 12 must be observed at all times.
Common application examples are: · When prevailing winds are from the air inlet side, then
position the wind barrier a minimum of 12 inches (305 mm) from the unit as illustrated in "Figure 28. Wind Barrier"
· When prevailing wind is into the discharge side, then position the wind barrier a minimum 79 inches (2007 mm) from the front of the unit as illustrated in "Figure 28. Wind Barrier"
· Outdoor unit can be installed in a dog house style shelter as illustrated in "Figure 29. Dog House-Style Shelter"
· Outdoor unit can be installed in a alcove or under a roof overhang as illustrated in "Figure 30. Unit installed in Alcove")
Prevailing Winter Winds from Air Inlet Side

Wind Barrier Inlet Air

12" (305mm) Min. Distance

79" (2007mm) Discharge Air Min. Distance Wind Barrier
Prevailing Winter Winds From Air Discharge Side
Figure 28. Wind Barrier

NOTE - Minimum clearances shown.
Figure 29. Dog House-Style Shelter

24 in 610 mm

12 in 305 mm

12 in 305 mm
24 in 610 mm
NOTE - Minimum clearances shown.
Figure 30. Unit installed in Alcove
Buried Refrigerant Pipe Protection
· All refrigerant lines must be insulated regardless of if it is buried
· In addition to insulating each line of piping, buried lines must rest inside a sealed, watertight conduit
· The conduit must be designed so it cannot collect and retain water
Outdoor Unit Condensate Piping
Condensate formed during the heating and defrost processes must be drained from heat pump units. Drain holes are provided in the base of the units to ensure proper drainage. Heat pumps must be raised when installed on a concrete pad or the ground to allow drainage to occur. If the heat pump unit is installed on wall mounting bracket, insert the provided drain connector into one of the 1

inch (25 mm) drain holes and attached a field-provided insulated drain hose to the connector. Use field-provided rubber plugs to cover any unused drain holes (see "Figure
31. Condensate Drain" on page 19).

Four Field-Provided Anchor Bolts

Drain Connector

Chassis

Condensate Drain (location varies per model)

Figure 31. Condensate Drain

Securing the Outdoor Unit
Slab or Roof Mounting
Install the unit a minimum of 4 inches (102 mm) above the roof or ground surface to avoid ice build-up around the unit. Place the unit above a load bearing wall or area of the roof that can adequately support the unit. Consult local codes for rooftop applications.
CAUTION
Roof Damage!
This system contains both refrigerant and oil. Some rubber roofing material may absorb oil. This will cause the rubber to swell when it comes into contact with oil. The rubber will then bubble and could cause leaks. Protect the roof surface to avoid exposure to refrigerant and oil during service and installation. Failure to follow this notice could result in damage to roof surface.

Securing Outdoor Unit to Slab, Frame, or Rails
If the outdoor unit is installed on a field-provided slab or frame, use lag bolts or equivalent to secure the outdoor unit to the slab or frame.

Figure 33. Securing Outdoor Unit to Rails
Securing Outdoor Unit to Hanging Brackets If the outdoor unit is installed on field-provided wall mounting brackets, use lag bolts or equivalent to secure the outdoor unit to the bracket. Minimum rear clearance can be reduced to 6 inches (152 mm) when mounted on brackets and with no obstructions on the other three sides. Allow for condensate disposal when placing units above one another.

Air Outlet

6 in 152 mm
Air Inlet

Figure 34. Securing Outdoor Unit to Brackets
Refrigerant Piping Connections
Field piping consists of two copper lines connecting the outdoor unit to the indoor unit. "Table 4. Refrigerant Piping and Indoor Unit Connection Sizes" lists the connection sizes. The connections are made using the provided brass flare nuts at the end of the refrigerant piping connections. Preparing Piping: 1. Choose the correct pipe sizes for your application
using "Refrigerant Piping and Indoor Unit Connection Sizes" on page 20.

Four field-provided Anchor Bolts
Figure 32. Securing Outdoor Unit to Slab
19

2. Confirm that you are using the correct diameter piping.
3. Determine the necessary piping length required for the application.
4. Cut the selected pipes with a pipe cutter. Make the cuts flat and smooth as illustrated in "Figure 35. Cutting Pipe"

90 o

Lean

Crude

Burr

Figure 35. Cutting Pipe

5. Insulate the copper piping. 6. Insert a flare nut onto each pipe before flaring. 7. Use "Table 3. Flaring Piping" to properly flare the pipe.

Pipe Diameter
1/4" (6.35) 3/8" (9.62) 1/2" (9.52" 5/8" (15.9)

Table 3. Flaring Piping

Flare Dimension A (mm)

Min

Max

Flare Shape

8.3

8.7

12.0

12.4

15.4

15.8

18.6

19.1

90°+- 4
45° A

R0.4~0.8

3/4" (22.9)

22.9

23.3

8. After flaring the pipe, temporarily sealed pipe ends with adhesive tape to avoid contaminants from entering the pipes.
9. The seal on the unit refrigerant piping connections should remain in place until the last possible moment. This will prevent dust or water from getting into the refrigerant piping before it is connected.
10. CAREFULLY adjust refrigerant piping connections to suit the application.
11. Slowly loosen one of the flare nuts to release the factory nitrogen charge from the indoor units only.
12. Remove the flare nuts from the connections on the unit and discard the seal from each of the piping connections.
13. Slide the flare nuts onto the ends of the field-provided refrigerant piping before using a suitable flaring tool to flare the end of the copper pipe.
14. Apply recommended HFC-410A refrigerant lubricant to the outside of the flared refrigerant lines.
IMPORTANT
The compressor in this unit contains PVE oil (Polyvinylether). PVE oil is formulated for hydrofluorocarbon (HFC) refrigerants, such as HFC410A, which this system contains. While it may have some miscibility properties with mineral-based oil and POE oil (Polyolester), it is not recommended to mix PVE oil with any other type of refrigerant oil.

15. Align the threaded connections with the flared refrigerant lines. Tighten the flare nuts lightly at first to obtain a smooth match as illustrated in "Figure 36. Making Connections (Male to Female Connection)".
16. Once snug, continue another half-turn on each nut which should create a leak-free joint. A torque wrench may be used to tighten flare nuts using "Table 5. Flare Nut Torque Recommendations" on page 21. Do not over-tighten a flared joint.
17. After refrigerant piping has been installed and checked for leaks, apply insulation over all flared connections.

Table 4. Refrigerant Piping and Indoor Unit Connection Sizes

Size (Btuh)

Liquid Line in.

Gas Line in.

9000

1/4

3/8

12000

1/4

1/2

18000

1/4

1/2

24000

3/8

5/8

36000 and 48000

3/8

5/8

Apply refrigerant lubricant

on the outside of the flare

Male Flare Connection

Figure 36. Making Connections (Male to Female Connection)
Torque Wrench
Backup Wrench

IMPORTANT
Always use two wrenches when tightening flare nuts to avoid twisting refrigerant piping. DO NOT over-tighten flare nuts.

Table 5. Flare Nut Torque Recommendations

Outside Diameter
Inches 1/4 3/8 1/2 5/8

Recommended Torque

No torque wrench available
Finger tighten and use an appropriately sized wrench to turn
an additional:

15 ft.-lb. (20 N)

1/4 turn

26 ft.-lb. (35 N)

1/2 turn

41 ft.-lb. (56 N)

7/8 turn

48 ft.-lb. (65 N)

1 full turn

To Indoor Unit

To Outdoor Unit

Figure 37. Tighten Flare Nut

Table 6. Refrigerant Line Set Requirements

INDOOR UNIT

Maximum Line Set Length

Maximum Elevation -
Outdooor Unit BELOW
Indoor Unit

OUTDOOR UNIT
Minimum Line Set Length - 10 ft. (3m)

Outside Unit BELOW Indoor Unit

Maximum Line Set Length
INDOOR UNIT

Minimum Line Set Length - 10 ft. (3m)
OUTDOOR UNIT
Maximum Elevation -
Outdooor Unit ABOVE Indoor Unit

Outside Unit ABOVE Indoor Unit

IMPORTANT
Do not allow for excess length of line sets to be left rolled up as part of the required distance, or in general. This will also cause additional performance issues.

System Size (KBtu)
009 012 018 024 036/048

Each system size has a line set length and vertical elevation parameters.

Line Set Diameters (in.)

Liquid

Gas

1/4

3/8

1/4

1/2

1/4

1/2

3/8

5/8

3/8

5/8

Maximum Elevation Outdoor Unit BELOW
Indoor Unit - Feet (Meter)

Maximum Elevation Outdoor Unit ABOVE
Indoor Unit - Feet (Meter)

40 (12)

66 (20)

82 (25)

98 (30)

Maximum Line Set Length - Feet
(Meters)
82 (25) 82 (25) 98 (30) 164 (50) 213 (65)

Leak Test and Evacuation
Air and moisture remaining in the refrigerant system will have undesirable effects as indicated below: · Pressure in the system rises
· Operating current rises · Cooling or heating efficiency drops · Moisture in the refrigerant circuit may freeze
· Water may lead to corrosion of parts in the refrigeration system
The line set between the indoor and outdoor units must be leak tested and evacuated to remove any noncondensables and moisture from the system.
IMPORTANT
Use only oxygen-free nitrogen (OFN).

Leak Test

Use the following procedure to test for system leaks:
1. Connect the manifold gauge set and dry nitrogen gas cylinder to the liquid and gas service ports.
2. Open valve on nitrogen cylinder. 3. Pressurize the system per the pressure test
specifications in "Table 7. Pressure Test Specifications". 4. Check that the system pressure remains stable. If
there is any movement check system for leaks. 5. After the system is found to be free of leaks:
· Close valve on nitrogen cylinder
· Relieve the nitrogen pressure by loosening the charge hose connector at the nitrogen cylinder
· When the system pressure is reduced to normal, disconnect the hose from the cylinder.

Table 7. Pressure Test Specifications

Bar Psig kPa Duration

1 3 44

303 Minimum of 10 minutes

2 15 220

1517 Minimum of 10 minutes

3 32 470

3241 Minimum of 10 minutes

4 45 650

4482

1 hour. Stress test to prove the integrity of the complete installation.

5 32 470

3241

24 hours. Lower system pressure test, after confirmation No. 4 was successfully completed.

Triple Evacuation Procedure
A Micron or Torr gauge must be used for this procedure. 1. Discharge the oxygen-free nitrogen and evacuate the
system to a reading of 8000 Microns (8 Torr) using all service valves.

2. Break the vacuum by allowing nitrogen into the port connections (liquid line and gas line pipes) until a positive pressure is achieved.
3. Evacuate the system to a reading of 5000 Microns (5 Torr).
4. Break the vacuum by allowing nitrogen into the port connections (liquid line and gas line pipes) until a positive pressure is achieved
5. Evacuate the system to a minimum reading of 500 Microns (0.5 Torr).
6. For a moisture-free system, ensure the vacuum is held without movement for a minimum of 4 hours.
7. If vacuum fails to hold, carry out steps 2 through 6 until vacuum holds.
Wiring Connections
IMPORTANT
Install unit so that unit disconnect is accessible. Use specified wiring and cable to make electrical connections. Clamp cables securely and make sure that connections are tight to avoid strain on wiring. Insecure wiring connections may result in equipment failure and risk of fire. Wiring must be installed so that all cover plates can be securely closed.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be rounded in accordance with national and local codes. Line voltage is present at all components when unit is not in operation. Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power sources.
CAUTION
All terminal connections must be made as illustrated in the following diagrams. Improperly connected wiring could damage unit or cause communication errors between indoor and outdoor units.
In the U.S.A., wiring must conform with current local codes and the current National Electric Code (NEC). In Canada, wiring must conform with current local codes and the current Canadian Electrical Code (CEC). Refer to unit nameplate for minimum circuit ampacity and maximum over-current protection size.
Outdoor Unit
· Refer to unit nameplate for minimum circuit ampacity and maximum over-current protection size
· Make all electrical power wiring connections at the outdoor unit

· Be sure to reattach all electrical box covers after connections are complete
Indoor Unit
· All indoor units are powered by the outdoor unit · Communication Wiring (Indoor Units 30K and Below):
Use one stranded 4-conductor wire to provide power and communication

· Communication Wiring (Indoor Units 36K and Above): Use one stranded 3-conductor wire to provide power and one stranded 2-conductor wire to provide communication
· See "Table 8. Single Zone Installation Wiring Requirements" on page 24 for further details.
NOTE: When installing a condensate pump, wire in-line with the CN5 float switch

208/230V Outdoor Unit Terminal Block
1 2 3 L1 L2

208/230V Indoor Unit Terminal Block
12 3

From Power Supply

Outdoor Unit

Indoor Unit

Figure 38. Single Zone Wiring (09K to 24K)

208/230V Outdoor Unit Power Terminal Block
L1 L2

From Power Supply
Outdoor Unit Communication Terminal Block
S1 S2

208/230V Indoor Unit Power Terminal Block

Indoor Unit CommunicationTerminal Block

E Y XQ E P

L1 L2

Outdoor Unit

Indoor Unit

Figure 39. Single Zone Wiring 36K & 48K Only

IMPORTANT
This unit must be properly grounded and protected by a circuit breaker. The ground wire for the unit must not be connected to a gas or water pipe, a lightning conductor or a telephone ground wire. Do not connect power wires to the outdoor unit until all other wiring and piping connections have been completed. Do not install the unit near a lighting appliance that includes a ballast. The ballast may affect remote control operation.
IMPORTANT
All diagrams (Figure 40 through Figure 512) are typical control board connection diagrams. Refer to the diagram on the unit for actual wiring.
Wiring Requirements

Table 8. Single Zone Installation Wiring Requirements

System and Terminal Designations

System Capacity System Voltage

Number of Conductors

Wire Type

Indoor to Outdoor Wiring (Communication/Power)
1, 2, 3 and GND

09K and 12K

208/230VAC

Stranded and unshielded

Wire Gauge / MCA
16AWG

Outdoor to Main Power L1, L2 and GND

09K and 12K

208/230VAC

Stranded and unshielded

16AWG

Indoor to Outdoor Wiring (Communication/Power)
1, 2, 3 and GND
Outdoor to Main Power L1, L2 and GND
Indoor to Outdoor Wiring (Communication/Power)
1, 2, 3 and GND
Outdoor to Main Power L1, L2 and GND
Indoor to Outdoor Wiring (Power only)
L1, L2 and GND

18K

208/230VAC

18K

208/230VAC

24K

208/230VAC

24K

208/230VAC

36K

208/230VAC

Stranded and unshielded
Stranded and unshielded
Stranded and unshielded
Stranded and unshielded
Stranded and unshielded

16AWG 14AWG / 17A
16AWG 12AWG / 22A
16AWG

Indoor to Outdoor Wiring 36K
(Communication only) (S1, S2 and GND)

208/230VAC

Stranded and shielded

24AWG

Outdoor to Main Power L1, L2 and GND
Indoor to Outdoor Wiring (Power only)
L1, L2 and GND
Indoor to Outdoor Wiring (Communication only) (S1, S2 and GND)
Outdoor to Main Power L1, L2 and GND
MCA = Minimum Circuit Amps

36K

208/230VAC

48K

208/230VAC

48K

208/230VAC

48K

208/230VAC

Stranded and unshielded

10AWG / 30A

Stranded and unshielded

16AWG

Stranded and shielded

24AWG

Stranded and unshielded

6AWG / 50A

Indoor Unit Control Board Wiring Connections

TO PROGRAMMABLE WIRED CONTROLLER
4

TO WIRED CONTROLLER
5 2

Alarm Output

Remote Control

Note: The programmable

wired controller and regular

wired controller use the same

wiring connector.

CN 40
P5 CN1 5

Motor

2
CN13

D IS P LA Y BOARD
10
CN 10 A ALA RM CN 10
CN3 3
INDOOR UNIT MAINBOARD

JR6

Note1: Remove the JR6 jumper for remote on /off contr ol

ON - OFF

CN23 JR6
CN6 4

INDOOR COIL TEMP.SENSOR
T2 BL AC K ROO M T EMP .SEN SOR
T1 WH ITE

PU MP 2 CN5
WATER LEVEL SWITCH

CN3

E Y X

CN1 CN110

RED(B ROW N) B LUE(B LA CK ) YELLOW

NOTE:

Y/G

COMPONENT IN DASH

12 3

LINE IS OPTIONAL

OR FIELD WIRING.

To LVM Comm.Bus

TO OUTDOOR UNIT

Figure 40. M22A009S4-*P, M22A012S4-*P and M22A018S4-*P Unit Wiring Diagram

COMPONENT IN DASH LINE IS OPTIONAL OR FIELD WIRING.
Note: Remove the JR6 jumper for remote on/off control

Note: The programmable wired controller and regular wired controller use the same wiring connector.

Swing Motor
Swing Motor
Swing Motor
Swing Motor

Figure 41. M33C Unit Wiring Diagram (All Sizes)

Outdoor Unit Control Board Wiring Connections

WIRING DIAGRAM

I NDOOR UNI T POWER SUPPLY

(T5)

Y/G

1 2 3 L1 L2

Y/G Y/G

BL UE RED

Y/G

CN17

CN15

CRANKCASE PAN

HEATER HEATER

CN3 CN2 CN1 CN16 EARTH L-IN N-IN S
CN1A

CN31
EEV

MA I N BOARD
CN50
DC FAN

EEV

CN1A I NPUT 230V AC

U VW

CN31 OUTPUT 0~12V DC

CN7 OUTPUT 0~310V AC CN60 OUTPUT 230V AC

CN21 OUTPUT 0~5V DC

T3 Condenser TEMP. Sensor CN15 OUTPUT 230V AC

T4 Ambient TEMP. Sensor CN17 OUTPUT 230V AC

T5 Discharge TEMP. Sensor CN50 OUTPUT 0~310V AC

Figure 42. 208/230V MPC009S4S-*P Outdoor Unit Wiring Diagram

T5
Figure 43. 208/230V MPC012S4S-*P Outdoor Unit Wiring Diagram

WIRING DIAGRAM
T3 T4 T5

INDOOR UNIT POWER SUPPLY

Y/G Y/G Y/G

1 2 3 L1 L2

RED BLUE

Y/G

CN17

CN16 CN19 CRANKCASE PAN

T.M.P_Sensor HEATER HEATER

4- WAY

CN6 CN8 CN7 CN2 EARTH L-IN N-IN S

MAIN BOARD

CN18
EEV

DC FAN

EEV

CN2 7/8 INPUT 230V AC

U VW

CN18 OUTPUT 0~12V DC

CN414 OUTPUT 0~310V AC CN60 OUTPUT 230V AC

CN17 OUTPUT 0~5V DC

T3 Condenser TEMP. Sensor CN16 OUTPUT 230V AC

T4 Ambient TEMP. Sensor CN19 OUTPUT 230V AC

T5 Discharge TEMP. Sensor CN27/28/29 OUTPUT 0~310V AC

Figure 44. 208/230V MPC018S4S-*P Outdoor Unit Wiring Diagram

WIRING DIAGRAM
T3 T4 T5

CN17 T.M.P_Sensor

CN16

CN19

INDOOR UNIT POWER SUPPLY

Y/G Y/G Y/G

1 2 3 L1 L2

RED BLUE

Y/G

CN6 CN8 CN7 CN2 EARTH L-IN N-IN S

MAIN BOARD

CN18
EEV

DC FAN

EEV

U VW

CN2 7/8 INPUT 230V AC

CN18 OUTPUT 0~12V DC

Y/G

CN414 OUTPUT 0~310V AC

CN60 OUTPUT 230V AC

CN17 OUTPUT 0~5V DC

T3 Condenser TEMP. Sensor CN16 OUTPUT 230V AC

T4 Ambient TEMP. Sensor CN19 OUTPUT 230V AC

T5 Discharge TEMP. Sensor CN27/28/29 OUTPUT 0~310V AC

Figure 45. 208/230V MPC024S4S-*P Outdoor Unit Wiring Diagram

T5
Figure 46. 208/230V MPC036S4S-*P Outdoor Unit Wiring Diagram 28

Figure 47. 208/230V MPC048S4S-*P Outdoor Unit Wiring Diagram

WIRING DIAGRAM

INDOOR UNIT POWER SUPPLY

Y/G T5
1 2 3 L1 L2

Y/G Y/G

BLUE

Y/G

RED

CN17

CN15

CRANKCASE PAN

HEATER HEATER

CN3 CN2 CN1 CN16 EARTH L-IN N-IN S
CN1A

CN31
EEV

MAIN BOARD
CN50
DC FAN

EEV

CN1A INPUT 230V AC

U VW

CN31 OUTPUT 0~12V DC

CN7 OUTPUT 0~310V AC CN60 OUTPUT 230V AC

CN21 OUTPUT 0~5V DC

T3 Condenser TEMP. Sensor CN15 OUTPUT 230V AC

T4 Ambient TEMP. Sensor CN17 OUTPUT 230V AC

T5 Discharge TEMP. Sensor CN50 OUTPUT 0~310V AC

Figure 48. 208/230V MLB009 and MLB0012S4S-*P Outdoor Unit Wiring Diagram

WIRING DIAGRAM
T3 T4 T5

I NDOOR UNI T

POWER SUPPLY

Y/G Y/G Y/G

1 2 3 L1 L2

RED BL UE

Y/G

CN17

CN16

CN19

CRANKCASE PAN

T.M .P_Sensor HEATER HEATER

4- WAY

CN6 CN8 CN7 CN2 EARTH L-IN N-IN S

MA I N BOARD

CN18
EEV

DC FAN

EEV

CN2 7/8 I NPUT 230V AC

U VW

CN18 OUTPUT 0~12V DC

CN414 OUTPUT 0~310V AC CN60 OUTPUT 230V AC

CN17 OUTPUT 0~5V DC

T3 Condenser TEMP. Sensor CN16 OUTPUT 230V AC

T4 Ambient TEMP. Sensor CN19 OUTPUT 230V AC

TP Discharge TEMP. Sensor CN27/28/29 OUTPUT 0~310V AC

Figure 49. 208/230V MLB0018S4S-*P Outdoor Unit Wiring Diagram

Y/G

%1/2

9 8

$.#%4'&

$.7'

& %( # 0/ 1 6 1 4 (/

NOT AVAILABLE ON 24K
6 6 62

L-PRO H-PRO

''8

NOT AVAILABLE ON 24K

U~V~W among

;'..19 4'&

phases 0~250VAC ;'..19 4'&

4'& *'#6A; %4#0-%#5'*'#6'4

$.#%- 9

4'& $.7'

8 7

4'& % 0

%0 $.#%-

Connect to FAN voltage among phases 0~200VAC

%0 Input:0-5VDC

Output:230 VAC MAIN BOARD

%0 Output:0-12VDC

*'#6A& %*#55+5*'#6'4

9*+6'

4'& % 0 Output:230 VAC

$.#%-

% 0 Output:230 VAC

Intput:230 VAC %0 %0 %0 %0

$.7' $.7'

CODE ,:+
%1/2A612
''8
(/ %1/2 *'#6A; %6

2#460#/' 6'4/+0#.$.1%% 1 / 2 6 1 21 .2 6 ' / 2 5 ' 0 5 1 4 '.'%64+%':2#05+8' 8#.8' & %( # 0/ 1 6 1 4
%1/24'5514
%4#0-%#5'*'#6'4 #%%744'06&'6'%614

*241 *+)*24'5574'59+6%*

.241 58
62

.1924'5574'59+6%* 4'8'45'8#.8' %1/2&+5%*#4)'
6'/25'0514

%1+.6'/25'0514

6 *'#6A&

176&114#/$+'06 6'/25'0514
%*#55+5*'#6'4

9#; 58
0QVGU %1/210'06+0&#5* .+0'+5126+10#. 14(+'.&9+4+0)

$.7'

$4190

;'..19 $.7'

Y/G

$4190

Y/G ,:+ ..

61+0&11470+06 219'45722.;

Figure 50. 208/230V MLB024S4S-*P Outdoor Unit Wiring Diagram

CN2 CN3

BLACK RED

IPM&PFC BOARD

BLACK CN4
CT1 RED CN2

V WU
COMP

BLACK RED BLUE

CN9

10 CN6

CN8

CN5

3
DCFAN1

3
DCFAN2

POWER SUPPLY

Y/G

Y/G
XT1

L1 L2

BLACK

CN3

CN1

RED

Y/G
XT2

BLUE P7

BROWN

(1)L1 (2)L2

Outdoor main Controller

TO INDOOR UNIT

TO INDOOR COMM. BUS

Q P

COMP TOP OLP TEMP SENSOR

CN22

S1 S2

XT3 GRAY
YELLOW

NOTE:Please use 2-core shielded wire.

BLACK RED WHITE

HEAT_D
Y/G The electric heating belt of chassis

CN25 CN24
CN18 CN17

BLACK RED
RED
BLUE BLUE

HEAT_Y The electric heating belt of compressor
4-WAY SV

Notes:
This symbol indicates the element is optional, the actual shape shall be prevail.

CODE COMP

PART NAME COMPRESSOR

CAP1,CAP2

FAN MOTOR CAPACITOR

CT1 EEV

AC CURRENT DETECTOR ELECTRIC EXPANSIVE VALVE

DCFAN1,DCFAN2 HEAT_D,HEAT_Y
H-PRO L-PRO 4-WAY

OUTDOOR DC FAN
CRANKCASE HEATING HIGH PRESSURE SWITCH LOW PRESSURE SWITCH
4-WAY VALVE

PAIQI T3 T4

EXHAUST TEMPERATURE SENSOR
CONDENSER TEMPERATURE SENSOR
OUTDOOR AMBIENT TEMPERATURE SENSOR

Figure 51. 208/230V MLB036S4S-*P and MLB048S4S-*P Outdoor Unit Wiring Diagram

Unit Start-Up

IMPORTANT
Units should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging.
1. Inspect all factory- and field-installed wiring for loose connections.
2. Verify that the manifold gauge set is connected.
3. Add additional refrigerant charge if required before opening valves and while system is still under a vacuum.
4. Open the liquid and gas line service valves to release the refrigerant charge contained in outdoor unit into the system.
5. Replace the stem caps and tighten to the value listed in "Table 2. Torque Requirements" on page 13.
6. Check voltage supply at the outdoor unit terminal strip. The voltage must be within the range listed on the unit's nameplate. If not, do not start the equipment until you have consulted with the power company and the voltage condition has been corrected.
7. Refer to the included user guide to operate the system using the provided remote control.
8. Visually check for binding of both indoor and outdoor fans.

Adding Refrigerant for Longer Line Set

The outdoor unit is factory-charged with refrigerant. Calculate the additional refrigerant required according to the diameter and the length of the liquid pipe between the outdoor unit and indoor unit connections.
Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance.

Table 9. Additional Refrigerant Charge

System Size (KBtu)

Pipe Length (feet / meters)

Amount of Refrigerant to add

>25 (7.5)

0.161 oz/ft (15g/m)

>25 (7.5)

0.161 oz/ft (15g/m)

>25 (7.5)

0.161 oz/ft (15g/m)

>25 (7.5)

0.322 oz/ft (30g/m)

>25 (7.5)

0.322 oz/ft (30g/m)

>25 (7.5)

0.322 oz/ft (30g/m)

Self Clean Feature
For units that use the provided wireless remote control, there is a button labeled "self clean". Press to activate self cleaning mode. In cooling or dry mode only, the indoor unit will temporarily change operation to allow condensate on the indoor unit coil to evaporate, and then will turn off. During this operation, code SC will display on the indoor unit.
The sequence of operation for the self-clean function is illustrated below.

Test Run

Figure 52. Self Clean

Pre-Checks
Only perform test run after you have completed the following steps: · Electrical Safety Checks Confirm that the unit's
electrical system is safe and operating properly
· Refrigerant Leak Checks Check all flare nut connections and confirm that the system is not leaking
· Confirm that gas and liquid valves are fully open
Procedure
You should perform the Test Run for at least 30 minutes. 1. Connect power to the unit. 2. Press the ON/OFF button on the remote controller to
turn it on. 3. Press the mode button to scroll through the following
functions, one at a time: · COOL - Select lowest possible temperature
· HEAT - Select highest possible temperature
4. Let each function run for 5 minutes, and perform the following checks:

Table 10. Test Run Checklist

Checks

Pass Fail

No electrical leakage

Unit is properly grounded

All electrical terminals properly covered

Indoor and outdoor units are solidly installed

All pipe connection points do not leak

Water drains properly from drain hose

All piping is properly insulated

Unit performs COOL function properly

Unit performs HEAT function properly

Indoor unit louvers rotate properly

Indoor unit responds to remote controller

Troubleshooting

Indoor Unit Error Codes

Table 11. System Status and Troubleshooting Error Codes

Type

Indoor Unit Display M22A M33C

Indoor Unit Error Codes Description

Status

dF Defrost

Status

Filter cleaning reminder(power on

display for 15 seconds).

Status

CL Active clean CP Remote switched off. FC Forced cooling.

Heating in room temperature under

8°C (46.4°F).

Status

Filter replacement reminder (power

on display for 15 seconds).

Error Error

Mode conflict for multi-zone systems

EH 00 Indoor unit EEPROM error

Error Error Error Error Error Error Error Error

EL 01 Communication error between

indoor unit and outdoor units

EH 03 Indoor fan speed error (DC motor)

EH 60 Indoor room temperature sensor

error (T1)

EH 61 Indoor coil temperature sensor

error (T2)

EL 0C Refrigerant leakage detection

(Cooling mode only)

High water level alarm

Indoor fan motor zero-crossing signal detection error (AC motor)

PC 08 Outdoor current overload

protection

Table 11. System Status and Troubleshooting Error Codes

Type

Indoor Unit Display M22A M33C

Indoor Unit Error Codes Description

Error

Communication error between wired controller and indoor unit

EC 53 Outdoor ambient temperature

sensor error (T4)

Error

The cassette panel is abnormal

Error

EC 52 Outdoor coil temperature sensor error (T3)

Error

EC 54 Compressor discharge temperature sensor error (T5)

Error

EC 51 Outdoor unit EEPROM error

Error

EC 07 Outdoor unit fan speed error (DC fan motor)

Error

Indoor coil outlet temperature sensor error (T2B)

Indoor unit #1 coil outlet temperature sensor error (T2B for multi-zone)

Indoor unit #2 coil outlet temperature sensor error (T2B for multi-zone)

Error

EC 56

Indoor unit #3 coil outlet temperature sensor error (T2B for multi-zone)
Indoor unit #4 coil outlet temperature sensor error (T2B for multi-zone)

Indoor unit #5 coil outlet temperature sensor error (T2B for multi-zone)

Indoor unit #6 coil outlet temperature sensor error (T2B for multi-zone)

Error

EH 0A Indoor unit EEPROM parameter error

Error

EH 0b

Communication error between main control board and display board

Error

PC 00 Inverter module IPM error

Error

PC 01 High or Low voltage protection

Error

PC 02 High temperature sensed at compressor top

Error

PC 0L Outdoor low ambient temperature protection

Error

PC 04 Compressor drive error

Error

High pressure switch open

PC 03

Error

Low pressure switch open

Error

Outdoor IGBT temperature sensor error

Outdoor Unit Error Codes
The error code display is located on the main controller board of the MPC036, MPC048, MLB036 and MLB048 models only.
Table 12. MLB and MPC Single-Zone Outdoor Unit Error Codes
Display Malfunction and Protection Indication

EL01 FL14

Communication malfunction between indoor and outdoor units.
Capability mismatch between indoor unit and outdoor unit

EC50 Outdoor temperature sensor error.

EC51 Outdoor EEPROM error.

EC52 Condenser coil temperature sensor (T3) malfunction.

EC53 Outdoor ambient temperature sensor (T4 ) malfunction.

EC54

Compressor discharge temperature sensor TP is in open circuit or has short circuited

EC55 Outdoor IPM module temperature sensor malfunction

EC56 Outdoor T2B sensor error.

EC57 Refrigerant pipe temperature sensor error.

EC07

Outdoor DC fan motor malfunction/fan speed out of control.

EC71 Over current failure of outdoor DC fan motor.

EC72 Lack phase failure of outdoor DC fan motor.

PC00 Inverter module (IPM) protection. PC02 Top temperature protection of compressor. PC06 Discharge temperature protection of compressor. PC08 Outdoor over-current protection. PC0A High temperature protection of condenser.

PC0F PFC module protection.

PC0L Low temperature protection of outdoor unit.

PC10 Outdoor unit low AC voltage protection.

PC11

Outdoor unit main control board DC bus high voltage protection.

Table 12. MLB and MPC Single-Zone Outdoor Unit Error Codes
Display Malfunction and Protection Indication

PC12

Outdoor unit main control board DC bus high voltage protection / 341 Machine Check Error (MCE) error.

PC30 System high pressure protection

PC31 PC40 PC42

System low pressure protection
Communication error between outdoor main chip and compressor driven chip
Compressor start failure of outdoor unit

PC43 Outdoor compressor lack phase protection

PC44 Outdoor unit zero speed protection

PC45 Outdoor unit IR chip drive failure

PC46 Compressor speed has been out of control PC49 Compressor over-current failure

PCA1 Condensation protection of refrigerant pipe

PH90 High temperature protection of Evaporator

PH91 Low temperature protection of Evaporator

LC06 High temperature protection of Inverter module (IPM)

Dry Mode Operation (Dehumidification) Procedure
1. Using the provided wired remote control, press the MODE button and select DRY mode.
2. Press the UP/ DOWN button to select the desired temperature. The temperature setting range is from 62°F (17°C) to 86°F (30°C) in one degree increments.
NOTE: The blower is preset at a low speed and cannot be changed therefore it will get cold and most likely will surpass the temperature setting and will run down to 50°F (10°C) room temperature depending on the room size or other various factors. Also the Follow Me mode does not operate in this mode.
NOTE: In addition, the indoor units do not have a humidistat installed therefore they are unable to determine humidity levels. This product is not recommend as a main source for dehumidification.
Sequence of Operation When in dry mode operation the unit is actually in cooling mode with a low speed blower operation. Set remote temp to a lower room temp to begin the dry mode operation. The compressor will stop when the room temperature is 50°F (10°C) lower than the temperature setting. System will not resume unit until room temperature rises above 53.6°F (12°C).
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