LENNOX 508280-01 Multi Position Air Handlers Instruction Manual

LENNOX 508280-01 Multi Position Air Handlers

Specifications

• Model: MMA036S4-1P
• Voltage: 208/230V-1 phase-60hz
• Unit Configuration: Multi-Position
• Refrigerant Type: HFC-410A
• Nominal Cooling Capacity: 3 tons (single zone)
• Unit Type: Single/Multi-Zone

Product Usage Instructions

Installation Instructions

The air handler is designed for indoor installation only. It is factory- equipped for upflow or horizontal air discharge applications. Ensure to check for shipping damage before installation. Consult local codes and authorities before proceeding with the installation.

Model Number Identification

The model number MMA036S4-1P indicates a Multi-Position Air Handler with a cooling capacity of 3 tons. The unit operates on 208/230V voltage with HFC- 410A refrigerant.

Dimensions

The air handler has various dimensions for different components such as supply air opening, low voltage inlets, line voltage inlets, condensate drains, and piping plate detail. Refer to the provided diagrams for a detailed view of the dimensions.

FAQs

• Q: Can the air handler be installed outdoors?
  • A: No, the air handler is designed for indoor installation only.
• Q: What should I do if I find shipping damage on the unit?
  • A: Immediately contact the carrier if any shipping damage is found on the unit.
• Q: Can the unit be converted to a horizontal right-hand air discharge position?
  • A: Yes, the horizontal drain pan can be repositioned in the field to allow installation in the horizontal right-hand air discharge position.

“`

©2024 Lennox Industries Inc. Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER 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, service agency, or the gas supplier.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.
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.

Shipping and Packing List
Package 1 of 1 contains:

1

Manual

2

Batteries(optional)

2

Cable ties

4

Foam

2

Flare nut (optional)

2

Braze to flare adapter (optional)

Assembled air handler unit

factory-equipped for upflow

or horizontal air discharge

application (includes upflow

and horizontal drain pans and

1

preinstalled air filter)

Check the air handler for

shipping damage; if found,

immediately contact the last

carrier. Check the unit rating

plate to confirm that delivered

unit matches order.

1

Wired Programmable Controller (M0STAT120N-1)

1 Wireless Controller (RG10F2)

General Information

The air handler is designed for indoor installation only. As shipped, the unit is ready for installation in either upflow or horizontal left-hand air discharge applications. Horizontal drain pan may be repositioned in the field to allow installation in the horizontal right-hand air discharge position. This instruction is intended as a general guide and does not supersede local or national codes in any way. Consult authorities having jurisdiction before installation.

Page 2

Model Number Identification – Indoor Air Handler

Series Type M = Mini-Split

M M A 036 S 4 – 1 P

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

Unit Configuration M = Multi-Position
Unit Type A = Air Handler

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

Nominal Cooling Capacity 018 = 1.5 tons (single/multi-zone)
024 = 2 tons (single/multi-zone) 036 = 3 tons (single zone) 048 = 4 tons (single zone) 060 = 5 tons (single zone)

Unit Type SM = Single/Multi-Zone S = Single Zone

Page 3

Dimensions – Indoor Air Handler

1 (25)

1 (25)

1 (25)

10-1/4 (200)

C
SUPPLY AIR OPENING

LOW VOLTAGE INLETS (Top and Left Sides)

LINE VOLTAGE INLETS (Top and Right Sides)

2-7/8 (73)
2-3/16 (56)

SUCTION LINE
LIQUID LINE

10-3/4 (273)

CONDENSATE DRAINS (2) (Horizontal)
CONDENSATE DRAINS (2)
(Upflow and Horizontal)

3-7/8 (98)

1-5/8 (41)

PIPING PLATE DETAIL

TOP VIEW
B 5/16 (8)

CIRCUIT BREAKER
COVER

AIR FLOW
A

SUCTION LINE

PIPING PLATE FILTER ACCESS

LIQUID LINE

FRONT VIEW

E

E

F
D
RETURN AIR OPENING
18-3/4 476

21 (533) LINE VOLTAGE INLETS
(Top and Right Sides)
RIGHT SIDE VIEW

BOTTOM VIEW

NOTE: Unit is shipped configured for horizontal left-hand air discharge. Unit may be converted to horizontal right-hand air discharge by repositioning horizontal drain pan. Dimensions remain the same in all configurations.

Model No.
A B C D E F G

018 / 024

in.

mm

45

1143

17-1/2

445

15-5/8

397

15-1/8

384

1-1/4

32

1-1/2

38

5/8

16

036 / 048

in.

mm

49

1245

21-1/4

540

19-1/8

486

18-5/8

473

1-1/4

32

1-5/8

41

5/8

16

060 in. 53 24-1/2 22-5/8 22-1/8 1-1/8 1-5/8 3/4

mm 1346 622 575 562
28 41 19

Page 4

Indoor / Outdoor Unit Match-Ups
Single Zone
Outdoor Unit MPC018S4S-P MPC024S4S-P MPC036S4S-P MPC048S4S-P MPC060S4S-P MLB018S4S-P MLB024S4S-P MLB036S4S-P MLB048S4S-*P

Multi-Zone

Outdoor Unit MPC024S4M-P MPC030S4M-P MPC036S4M-P MPC048S4M-P MLB030S4M-P MLB036S4M-P MLB048S4M-*P

Controller Compatibility

Indoor Unit MMA018SM4-1P MMA024SM4-1P MMA036S4-1P MMA048S4-1P MMA060S4-1P

Indoor Unit MMA018 MMA024 MMA036 MMA048 MMA060 MMA018 MMA024 MMA036 MMA048
Indoor Unit MMA018 / MMA024
MMA018 MMA018 / MMA024 MMA018 / MMA024
MMA018 MMA018 / MMA024 MMA018 / MMA024

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

Controller
M0STAT120N-1 (Mini-Split Wired Programmable Controller) 24-Volt Thermostat (optional)

Matching With Multi-Zone Outdoor Unit

NOTE:

Mode of Air Handler (MMA)

Mode of other IDU Zones

Mode Conflict Unit

Fan

MMA

Cooling

Heating/Electric Heat/Emergency Heat

MMA

Dehumidification

MMA

Heating

Other IDU Zones

Electric Heat

Fan/Cooling/Dehumidificaton

Other IDU Zones

Emergency Heat

Other IDU Zones

When Heating reaches the temperature and shuts down with other IDU zones heating normally, the air handler’s fan will stop running and the Fan-ON mode is invalid.

The heat pump will start synchronously when Emergency Heat or Electric Heat is started.

When two air handler units are connected by a multi-zone outdoor unit, the above rules apply. The second air handler unit is regarded as other IDU Zones.

Page 5

Requirements

WARNING
Excessive Weight Hazard – Use two or more people when moving and installing the unit. Failure to do so can result in back or other type of injury.
IMPORTANT
Air handler units include a factory-installed check/ expansion valve which will provide optimal refrigerant control and system performance with outdoor units of varying capacities. These units must be installed as a part of a matched system.
These instructions are intended as a general guide and do not supersede local or national codes in any way. Consult authorities having jurisdiction before installation.
Compliance with all local, state, or national codes pertaining to this type of equipment should be determined prior to installation. Read this instruction manual, as well as the instructions supplied in separate equipment, before starting the installation.
In addition to conforming to manufacturer’s installation instructions and local municipal building codes, installation of Lennox air handler units (with or without optional electric heat), MUST conform with National Fire Protection Association (NFPA) standards: “Standard for Installation of Air Conditioning and Ventilation Systems” (NFPA No. 90A) and “Standard for Installation of Residence Type Warm Air Heating and Air Conditioning Systems” (NFPA No. 90B).
All models are designed for indoor installation only. The installation of the air handler, field wiring, duct system, etc. must conform to the requirements of the National Electrical Code, ANSI/NFPA No. 70 (latest edition) in the United States, and any state laws, and local ordinances (including plumbing or waste water codes).
Local authorities having jurisdiction should be consulted before installation is made. Such applicable regulations or requirements take precedence over the general instructions in this manual.
Install the conditioned air plenum, ducts and air filters (provided) in accordance with NFPA 90B Standard for the Installation of Warm Air Heating and Air-Conditioning Systems (latest edition).
The air handler is shipped from the factory completely assembled. The unit is provided with flanges for the connection of the duct system.
Do not remove the cabinet knockouts until it has been determined which knockouts will need to be removed for the installation.
Select the air discharge position that best suits the site conditions. Consider required clearances, space, routing requirements for refrigerant line, condensate disposal, filters, duct system, wiring, and accessibility for service. Refer to the rating plate on the air handler for specific information.

WARNING
Danger of explosion. Keep flammable materials and vapors, such as gasoline, away from air handler. Place air handler so that heating elements are at least 18 inches (46 cm) above the floor for a garage installation. Failure to follow these instructions can result in death, explosion, or fire.
IMPORTANT
Excessive condensation may occur if the unit is installed in a warm, humid place. When the unit is installed in an unconditioned space, apply sealant around electrical wires, refrigerant piping and condensate lines at the point where they enter the cabinet. Apply sealant on the inside of the cabinet at the point where the electrical wires exit through the conduit opening. This will also keep warm and moist unconditioned air out of the air handler cabinet where it will form condensate on the cooler control box and electrical controls.
IMPORTANT
This unit is approved for installation clearance to combustible material as stated on the unit rating plate. Accessibility and service clearances must take precedence over combustible material clearances. The air handler must be installed so that free access is allowed to the coil/filter compartment and blower/control compartment.
NOTE: During cooling operation, excessive sweating may occur if the air handler is installed in a warm and humid space.
If installed in an unconditioned space, sealant should be applied around the electrical wires, refrigerant tubing, and condensate lines where they enter the cabinet.
Electrical wires should be sealed on the inside where they exit the conduit opening. Sealant is required to prevent air leakage into, and condensate from forming inside of, the air handler, the control box, and on the electrical controls.
This unit is approved for installation clearance to combustible material as stated on the unit rating plate. Accessibility and service clearances must take precedence over combustible material clearances.
The air handler must be installed so that free access is allowed to the coil/filter compartment and blower/control compartment.

Page 6

Installation Clearances

Non-Ducted Return Closet Installation
The air handler can be installed in a closet with a false bottom to form a return air plenum. It may also be installed with a return air plenum under the air handler. Louvers or return air grilles are field-supplied. Local codes may limit application of systems without a ducted return to single-story buildings. When an air handler unit is installed in a closet with a louvered return opening, the minimum open area for the louvers will be: · 320 square inches for 018 and 024 models; · 360 square inches for 036 models; · 450 square inches for 048 through 060 models If the free area is not known, assume a 25% free area for wood or a 75% free area for metal louvers or grilles. Using the louver dimensions and the 25% or 75% assumption, determine if the open area meets the minimum open area listed above. If a return air plenum is used, the return air grille should be immediately in front of the opening in the plenum to allow for the free flow of return air. When not installed in front of the opening, there must be adequate clearance around the air handler to allow for the free flow of return air.
Indoor Unit
Indoor Unit Parts
WARNING
Securely install the indoor unit on a structure that can sustain its weight. If the structure is too weak, the unit may fall and cause personal injury, unit and property damage, or death. DO NOT install the indoor unit in a bathroom or laundry room as excessive moisture can short the unit and corrode the wiring. Danger of explosion. Keep flammable materials and vapors, such as gasoline, away from the air handler. Position the air handler so that heating elements are at least 18 inches (457 mm) away above the floor for garage installation. Failure to follow these instructions can result in death, explosion, or fire.

CAUTION
Install the indoor and outdoor units, cables and wires at least 3.2 feet (1 m) from televisions or radios to prevent static or image distortion. Depending on the appliances, a 3.2 feet (1 m) distance may not be sufficient. If the indoor unit is installed on metal, it must be electrically grounded.
IMPORTANT
Apply sealant around the places where the wires, refrigerant pipes and condensate pipes enter the cabinet.
The indoor unit should be installed in a location that meet the following requirements:
· Ample space for installation and maintenance
· Ample space for the connecting pipe and drainpipe
· The ceiling is horizontal and its structure can sustain the weight of the indoor unit
· The air inlet and outlet are not impeded
CAUTION
DO NOT install units in: · Areas with oil drilling or fracking · Areas with high salt content in the air · Areas with caustic gases in the air · Enclosed spaces, such as cabinets · Areas with strong electromagnetic waves · Areas that store flammable materials or gas · Rooms with high humidity, such as bathrooms or
laundry rooms
IMPORTANT
Use duct tape and/or Permagum to seal close any space around the holes where the drain lines exit the cabinet. Warm air must not be allowed to enter through any gaps or holes in the cabinet.
Remove all accessories and packing in the air outlet before installation.
Air Outlet

Page 7

WARNING
There must be an airtight seal between the bottom of the air handler and the return air plenum. Use fiberglass sealing strips, foil duct tape, caulking, or equivalent sealing method between the plenum and the air handler cabinet to ensure
a tight seal. Return air must not be drawn from a room where this air handler or any gas-fueled appliance (i.e., water heater), or carbon monoxide-producing device (i.e., wood fireplace) is installed.

Unit Clearances
The distance between the mounted indoor unit should meet the specifications illustrated in the following diagram. Horizontal Plenum Clearances The outlet side pipe length is 4.9 ft (1.5m)
Minimum Clearance of 1 inch (25.4 mm) on all sides

Recommended Filter Size

Model (b/tuh)
18-24K 36-48K
60K

Model A (for North American Models)

W

D

in. mm. in. mm. in.

16 406.4 20

508

1

19-1/2 495.3 20

508

1

23 584.2 20

508

1

t mm. 25.4 25.4 25.4

4.9 ft (1.5m) Flexible Duct Colllar
Vertical

Or

NOTE: When installed vertically (upward or downward), the lower end of the air outlet must be fastened by screws.

Page 8

Installation Positions
Vertical
24 inches (610mm)

Horizontal

24 inches (610mm)

Duct Connections
Air supply and return can be handled in one of several ways best suited to the installation (see table for dimensions for duct inlet and outlet connections). The vast majority of problems encountered with combination cooling systems can be linked to improperly designed or installed duct systems. It is therefore highly important to the success of an installation that the duct system be properly designed and installed. Use flexible duct collars to minimize the transmission of vibration/noise into the conditioned space. Where return air duct is short, or where sound could potentially be a problem, use sound absorbing liner inside the duct. Insulation of duct work is a must where it runs through an unconditioned space during the cooling season. The use of a vapor barrier is recommended to prevent absorption of moisture from the surrounding air into the insulation. The supply air duct should be properly sized by use of a transition to match unit opening. All ducts should be suspended using flexible hangers and never fastened directly to the structure. This unit is not designed for non-ducted (freeblow) applications. Duct work should be fabricated and installed in accordance with local and/or national codes. Follow ACCA Manual D guidelines for return air filter grille sizing.

Page 9

IMPORTANT
A secondary drain pan, with a drain pipe to the outside of the building is required in all installation over a finished living space or in any area that may be damaged by overflow from the main drain pan. In some localities, local codes may require a secondary drain pan for any horizontal installation.

Mount Positions
The units can be installed in a vertical (up/down) and horizontal (right/left) configuration.
Vertical

To install the air handler Vertically (down) or Horizontally (right): 1. Open the upper cover.
2. Connect the wire according to the wiring diagram. 3. Connect the pipes 4. Install the drainage pipes.

Horizontal

Upflow

Downflow

Horizontal left

NOTE: For horizontal installations, a secondary drain pan must be installed.

Horizontal right NOTE: Vertical up and horizontal left installations do not
require a change of the direction of the evaporator.

Page 10

Temperature Sensor Locations
The following image indicates the temperature sensor locations on the evaporator for all units. NOTE: The MMA indoor evaporator coil does not have
an EEV (Electronic Expansion Valve) installed, as shown below.
18-24K model

Rotating Evaporator and Drain Pan 1. Remove the filter cover plate.

T2 T1

30-48K model

2. Remove the upper cover assembly. T2

T1

60K model

T2

3. Remove evaporator cover plate.

T1

Figure 1. Temperature Sensor Locations

T1

Room Temp Sensor

T2

Evaporator Sensor

Page 11

4. Unplug temperature sensors T1, T2 from the control board.
· T1: Room Temperature Sensor
· T2: Evaporator Central Sensor Plug

6. Remove the evaporator and drain pan; rotate it 180°.

NOTE: T1 is available on select models. 5. Remove T1 and T2 sensor ties.

7. Relocate the position of the mounting parts. 8. Reinstall the evaporator and drain pain.

Page 12

9. Reconnect T1 and T2 sensor plugs to the control board and secure the sensor wires. a. Cut the foam gasket. b. Remove knockouts. c. Hook the wire into the buckle and place the wire down into the wire slot. d. Replace the foam gasket over the wires.
A

11. Reinstall the evaporator cover plate.

B

12. Connect the wire according to the wiring diagram.

C

13. Reassemble the upper cover.

D

10. Use the cable ties to affix the Temperature Sensor back into place.
14. Reinstall filter cover plate. 15. Connect the pipes. 16. Install the drainage pipes.

Page 13

Condensate Drain

IMPORTANT
On units of this type, where the blower “draws” rather than “blows” air through the coil, traps must be installed in the condensate drain lines (primary and auxiliary, if used). Traps prevent the blower from drawing air through the drain lines into the air supply.

ABOVE FINISHED SPACE?
NO

OVERFLOW DRAIN LINE
ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TO ROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGE OVERFLOW SWITCH KIT. WIRE KIT TO SHUT DOWN COMPRESSOR PER INSTRUCTIONS.
LENNOX # X3169
COMPACT OVERFLOW SWITCH WITH 3/4″ FEMALE SLIP INLET AND MALE ADAPTER, TWO PART DESIGN FOR USE WHERE OBSTRUCTIONS PREVENT DIRECT THREADING

VENT MUST EXTEND ABOVE HEIGHT OF COIL DRAIN PAN BY TWO INCHES (51MM)

VENT

CLEAN OUT
PRESS IN (DO NOT GLUE)

YES

AIR HANDLER DRAIN PAN
OVERFLOW DRAIN

MAIN DRAIN

1″ X 3/4″ X 3/4″ REDUCING TEE WITH PLUG

NOTE — WHEN A AIR HANDLER IS LOCATED ABOVE A FINISHED SPACE THE SECONDARY DRAIN PAN MUST HAVE A LARGER FOOTPRINT THAN THE AIR HANDLER.

MAIN DRAIN

CUT TO REQUIRED
LENGTH

SECONDARY DRAIN PAN

WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A 3/4″ (19.1MM) SECONDARY DRAIN LINE MUST BE:
CONNECTED TO SECONDARY DRAIN PAN

FIELD PROVIDED PIPE NIPPLE
SIDE VIEW

OR
CONNECTED TO THE OVERFLOW DRAIN OUTLET OF THE AIR HANDLER DRAIN PAN.

TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES — GENERALLY, TWO INCHES (51MM).
1 LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90.

LENNOX1 P-TRAP 49P66, J-TRAP # 91P90 OR ANY PVC SCH 40 P- OR
J-TRAP 3/4″

2″ (51MM)

TRAP DEPTH TO APPROVED

DRAIN

FOR NEGATIVE PRESSURE COILS (BLOWER AFTER COIL) TRAPS ARE REQUIRED ON ALL DRAIN LINES CONNECTED TO COIL.

DRAIN LINE SHOULD SLOPE A MINIMUM OF ONE INCH PER 10

FEET (25MM PER 3

METERS)

Figure 2. Typical Main and Overflow Drain

IMPORTANT

THIS CORNER SHOULD BE 5/8″ (+/- 1/8″) HIGHER THAN DRAIN CORNER

A field-fabricated secondary drain pan, with a drain pipe to the outside of the building, is required in all installations
over a finished living space or in any area that may be damaged by overflow from the main drain pan. In some localities, local codes may require a secondary drain
pan for any horizontal installation.

Sloping the Unit
Make sure the unit is sloped so that the drain pan will empty completely without water standing in the pan. See “Figure 3. Sloping the Unit for Proper Drainage”.

DRAIN CORNER

LEVEL PLANE

Figure 3. Sloping the Unit for Proper Drainage

Page 14

Installing Condensate Drain
The air handler is provided with 3/4″ NPT condensate drain connections.
IMPORTANT
On some pans, the primary and secondary drain holes have knockouts. Confirm primary and secondary drains are open.
1. Units are equipped with a drain pan, which includes green (main drain) and red (secondary drain) plugs. Unscrew the plugs to remove them before inserting condensate drain fittings.

UNSCREW PLUGS AND CONNECT
PROPERLY SIZED FIELD-PROVIDED
FITTINGS AND DRAIN LINES.

DRAIN PAN

MAIN DRAIN PLUG

SECONDARY DRAIN PLUG

Figure 4. Drain Line Connections
2. Install properly sized, field-provided connection fittings and connect primary drain line to the main drain pan connection.
NOTE – When installing drain line connection fittings to the drain pan, hand tighten the fitting and use a thread sealant. Over-tightening the fittings can split connections on the drain pan.
3. If the secondary drain line is to be used, remove the plug or the knockout and route the drain line so that water draining from the outlet will be easily noticed by the homeowner. Refer to local codes for drain trap requirements on the secondary drain line.
4. Check again to ensure drain ports and drain pan are free of all debris.
5. Plug and check any unused drain pan openings for tightness. Torque plugs to 36 in. lb. to prevent water leaks.
6. Install a 2″ trap in the main (primary) drain lines as close to the unit as practical (“Figure 2. Typical Main and Overflow Drain”). Make sure the top of the trap is below the connection to the drain pan to allow complete drainage of the pan.

NOTE – Horizontal runs must have an anti-siphon air vent (standpipe) installed ahead of the horizontal run. See “Figure 2. Typical Main and Overflow Drain”. An extremely long horizontal run may require an oversized drain line to eliminate air traps. NOTE – Do not operate air handler without a trap in the main (primary) drain. The condensate drain is on the negative pressure side of the blower; therefore, air being pulled through the condensate line will not allow positive drainage without a proper trap. 7. Route the drain line to the outside or to an appropriate
drain. Drain lines must be installed so they do not block service access to the front of the air handler. A 24″ clearance is required for filter, coil, or blower removal and service access. NOTE – Check local codes before connecting the drain line to an existing drainage system. Insulate the drain lines where sweating could cause water damage.
Test Condensate Drain
Test the drain pan and drain line after installation:
1. Pour several quarts of water into drain pan. Use enough water to fill both the drain trap and the line.
2. Check the installed drain pan. Drain pan must be draining completely. Drain line fittings must not be leaking. Water must be draining from the end of the primary drain line.
3. Correct any leaks found.

Page 15

Refrigerant Piping Connection
WARNING
· All field piping must be completed by a licensed technician and must comply with the local and national regulations.
· When the heat pump is installed in a small room, measures must be taken to prevent the refrigerant concentration in the room from exceeding the safety limit in the event of refrigerant leakage. If the refrigerant leaks and its concentration exceeds its proper limit, hazards due to lack of oxygen may result.
· When installing the refrigeration system, ensure that air, dust, moisture or foreign substances do not enter the refrigerant circuit. Contamination in the system may cause poor operating capacity, high pressure in the refrigeration cycle, explosion or injury.
· Ventilate the area immediately if there is refrigerant leakage during the installation. Leaked refrigerant gas is both toxic and flammable. Ensure there is no refrigerant leakage after completing the installation work.

Pipe Length and Elevation

Ensure the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and outdoor units meet the requirements shown in the table below.

Max Length and Drop Height based on Models (ft./m)

Type of Model

Capacity (Btu/h)

Length Max. Drop of Piping Height

MMA018, MMA024, MMA036, MMA048,
MMA060

18K 24K 36K/48K/60K

98/30 164/50 213/65

66/20 82/25 98/30

Oil Trap
CAUTION
If oil flows back into the outdoor unit’s compressor, this might cause liquid compression or deterioration of oil return. Oil traps in the rising refrigerant piping can prevent this. An oil trap should be installed every 20ft (6m) of vertical suction line riser (less than 36000 Btu/h unit). An oil trap should be installed every 32.8ft (10m) of vertical suction line riser (greater than or equal to 36000Btu/h unit). Reference the Lennox Refrigerant Piping Guidelines (Corp. 9351-L9) for further guidance.

Suction

Figure 5. Oil Trap in Rising Gas Pipe

Connecting Pipe Assembly

Shape

Quantity (PC)

Liquid Side
Gas Side

1/4 in. (6.35) 3/8 in. (9.52) 1/2 in. (12.7) 5/8 in. (16) 3/4 in. (19)

Parts must be purchased
separately.

7/8 in. (22)

Page 16

Connection Instructions – Refrigerant Piping
CAUTION
· DO NOT install the connecting pipe until both indoor and outdoor units have been installed.
· Insulate both gas and liquid piping, and all flared brass connections thoroughly to prevent condensation.
Cut Pipes
When preparing refrigerant pipes, take extra care to cut and flare them properly. This will ensure efficient operation and minimize the need for future maintenance. 1. Measure the distance between the indoor and outdoor
units. 2. Using a pipe cutter, cut the pipe a little longer than the
measured distance. 3. Make sure that the pipe is cut at a perfect 90° angle.

Flare Pipe Ends Proper flaring is essential to achieve an airtight seal. 1. After removing burrs from cut pipe, seal the ends with
PVC tape to prevent foreign materials from entering the pipe. 2. Sheath the pipe with insulating material. 3. Place flare nuts on both ends of pipe. 4. Verify the flare nuts are facing the right direction because the flare nuts cannot be adjusted after flaring.
5. Remove PVC tape from ends of pip when ready to perform flare work.
6. Clamp flare form on the end of the pipe. The end of the pipe must extend beyond the flare form.

NOTE: Use extreme caution when cutting the pipe. Avoid damaging, denting, or warping the pipe while cutting it. Damaged pipes will drastically reduce the heating efficiency of the unit.
Remove Burrs

Burrs can affect the air-tight seal of refrigerant piping connection. Burrs must be completely removed.
1. Hold the pipe at a downward angle to prevent burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove all burrs from the cut section of the pipe.

7. Place flaring tool onto the form. 8. Turn the handle of the flaring tool clockwise until the
pipe is fully flared. Flare the pipe in accordance to the dimensions in Table

1. Table 1. Piping Extension Beyond Flare Form

Pipe Gauge

Tightening Torque

Flare Dimension (A) (Unit: in. (mm)

Min.

Max.

6.35 (1/4″) 18 – 20 N.m. 0.33/8.4 0.34/8.7 14 ft.-lb. (13 – 14)

9.52 (3/8″) 32 – 39 N.m. 0.52/13.2 0.53/13.5 26 ft.-lb. ( 23 – 28)

12.7 (1/2″) 49 – 59 N.m. 0.64/16.2 0.65/16.5 41 ft.-lb. (36 – 43)

16 (5/8″)

57 – 71 N.m. 0.76/19.2 0.78/19.7

48 ft.-lb. (42 – 52)

19 (3/4″)

67 – 101 N.m. 0.91/23.2 0.93/23.7

70 ft.-lb. (49 – 74)

22 (7/8″) 85 – 110 N.m. 1.04/26.4 1.06/26.9 75 ft.-lb. (62 – 81)

Flare Shape

Page 17

9. Remove the flaring tool and flare form. 10. Inspect the end of the pipe for cracks and even flaring.
Connect Pipes
Connect the copper pipes to the indoor unit first, then connect it to the outdoor unit. Connect the low-pressure pipe, then the high-pressure pipe.
1. When connecting the flare nuts, apply a thin coat of refrigeration oil to the flared ends of the pipes.
2. Align the center of the two pipes to be connected. 3. Tighten the flare nut snugly by hand. 4. Use a wrench to grip the nut on the unit tubing. 5. Firmly grip the nut and us a torque wrench to tighten
the flare nut according to Table 1. NOTE: Use a spanner and torque wrench when
connecting or disconnecting pipes to/from the unit.

CAUTION
· Wrap insulation around the piping. · Direct contact with bare piping may result in burns
or frostbite. · Ensure the pipe is properly connected. Over-tight-
ening may damage the bell mouth and under-tightening may lead to leakage.
NOTE: Minimum Bend Radius – Carefully bend the tubing in the middle according to the diagram below. DO NOT bend the tubing more than 90° or more than three times.
Bend the tube with thumb

min-radius 3.9″ (10 cm)
6. After connecting the copper pipes to the indoor unit, wrap the power cable, signal cable and the piping together with binding tape.
NOTE: DO NOT intertwine or cross the signal cable with any other wiring while bundling the wires together.
7. Thread this pipeline through the wall and connect it to the outdoor unit.
8. Insulate all the piping, including the valves of the outdoor unit.
9. Open the stop valves of the outdoor unit to start the flow of the refrigerant between the indoor and outdoor unit.
CAUTION
Verify there is not a refrigerant leak after completing the installation work. If there is a refrigerant leak, ventilate the area immediately and evacuate the system.

Page 18

Air Handler Air Conditioners Refrigerant Piping Connection Complete the indoor unit connection pipe assembly as shown below. If it is connected in any way other than what is shown, it will cause performance issues.
Figure 6. Refrigerant Piping Connections After the unit is installed, thoroughly wrap the piping and brass fitting with foam tape.
Foam Tape
Figure 7. Insulate Valve Page 19

Electric Auxiliary Heat Module

Accessories Name Manual

Shape

Quantity 2

Foam Gasket

1

Electric Auxiliary Heat Module Installation and Wiring Operation
Before installation, confirm the electric auxiliary heat module and supplied accessories are present and free of damage. Do not attempt to install if damage is present.
1. Remove the upper cover and remove the knock-out holes of the upper cover.

Screws

7

Silicone Breaker

1

Cover

Electric Auxiliary

1

Heating Wiring

Diagram

Circuit Breaker

1

Label

NOTE: Installation must be performed by an licensed contractor. Use extreme caution when installing the unit.
For units requiring supplemental heating, the optional Electric Auxiliary Heat Module is available in sizes from 5kW to 20kW to accommodate appropriate sizing given the specific heat load and electrical requirements of each installation. Refer to the table below for selections of available sizes of each model. Be sure to avoid improper matching.

Model (Btuh)
18 24 36 48 60

5kW
Y Y Y – – – – –

8kW
Y Y Y Y – – –

10kW
Y Y Y Y Y

15kW
– – Y Y Y Y

20kW
– – – – Y Y Y

Page 20

2. Remove the terminal block and power wires, loosen the screws, and remove the electric auxiliary heating cover.

4. Tighten the mounting screws.

3. Install the electric auxiliary heating assembly into the chassis shell from the front. The front end must be inserted into the shell assembly cavity.

5. Wire according to the wiring nameplate. 6. Tape the wiring diagram to the inside cover wiring for
future reference. 7. Install the upper cover. 8. Install silicone breaker cover.

9. Apply the circuit breaker label near the silicone breaker cover.
Page 21

Electric Auxiliary Heat Wiring Diagram
Page 22

Powering Unit

Confirm the following before powering the unit. · Check all wiring and ensure reliable connection of wire body
· Check the electric heating fixing screw
· Verify the size selection of power wire meets the power supply requirements.

Specs.
5 kW 8 kW 10 kW 15 kW 20 kW

Number Number of Circuit of Relays Breakers

1

1

1

2

1

2

2

3

2

4

Number of Power
Cord Groups

Number of Power Cord Grounding
Screws

2

2

2

2

2

2

3

3

3

3

Units Without Electrical Heat

If the branch circuit wire length exceeds 100 ft., consult NEC210-19a to determine maximum wire length. Use 2% voltage drop.

Unit Size

VoltsPhase

Rated Min Current CKT
(A) Amps

18K 208/230-1 2.0

2.5

24K 208/230-1 3.0

4.0

36K 208/230-1 4.0

5.0

48K 208/230-1 6.0

7.5

60K 208/230-1 7.0

9.0

Branch Circuit

Min Wire Size AWG

Fuse/ CKT BKR AMPs

16#

15.0

16#

15.0

16#

15.0

16#

15.0

16#

15.0

Use copper wire only to connect unit. Consult applicable tables of the National Electric Code (ANSI/NFPA 70) if other than uncoated (non-plated) 75°C copper wire (solid wire for 10 AWG and smaller, stranded wire for larger than 10 AWG) is used. NOTE: The specification may be different between
models. Refer to the indoor unit’s nameplate.

Page 23

Electric Heat Data

Indoor Model Usage

Electric Heat

Size and

Model Number

Volt

Input kW

1 Btuh

2 Minimum Circuit Ampacity (MCA)

Ckt 1

Ckt 2

3 Maximum Overcurrent Protection (MOCP)

Ckt 1

Ckt 2

018,

5 kW

024,

036

EAH-05B 208 (24Z26) 220
230

3.8

12,800

4.2

14,300

23 / 27

– – –

25 / 30

– – –

4.6

15,700

240

5.0

17,100

018,

8 kW

024,

036,

048

EAH-08B 208 (24Z27) 220
230

6.0

20,500

6.7

22,900

37 / 42

– – –

40 / 45

– – –

7.3

25,100

240

8.0

27,300

018,

10 kW

024,

036,

048,

060

EAH-10B 208 (24Z28) 220
230
240

7.5

25.600

8.4

38.700

46 / 53

– – –

50 / 60

– – –

9.2

31.400

10.0

34.100

024,

15 kW

036,

048,

060

EAH-15B 208 (24Z29) 220
230

11.3

38,400

12.6

43,000

23 / 27

46 / 53

25 / 30

50 / 60

13.5

47,000

240

15.0

51,200

036,

20 kW

048,

060

EAH-20B 208 (24Z30) 220
230

15.0

51,200

16.8

57,300

46 / 53

46 / 53

50 / 60

50 / 60

18.4

62,700

240

20.0

68,200

1 Electric heater capacity only – does not include additional blower motor heat capacity. 2 Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F. 3 HACR type breaker or fuse.

Page 24

485 PORT

CN4 CN5 CN1
Output:24VAC Output:24VAC Output:+15VDC BCD R C L G Y1 BCD Y/Y2

BLACK YELLOW (WHITE)
BCD

T2 Output:12VDC
CN34 Output:220VAC
CN15

Electric Heat Wiring Diagram
18-24K Units
345 345 345 345 23456
Page 25

NOTE1: 1.The parts with dotted line indicates
optional features. 2.Remove the short connector of JR1
when you use the “on-off” function. 3.Remove the short connector of J1
when you use the “WATER LEVEL SWITCH” function. 4. This symbol indicates the element
is optional, the actual shape shall prevail.

WIRING DIAGRAM

CODE PART NAME ECM INDOOR ECM MOTOR
CAP INDOOR FAN CAPACITOR FAN INDOOR FAN MOTOR

T1

ROOM TEMP SENSOR

T2 COIL TEMP.SENSOR T2A INDOOR COIL INLET TEMP.SENSOR T2B INDOOR COIL OUTLET TEMP.SENSOR

T1

ECM

UVLED

M

OUTPUT

2

T2A T2B

4(3) 3

3

HEATER

24V THERMOSTATS SETTING

CODE FACTORY SETTING

A BCDE

F01
S3
8
0~F

79

ON

ON

ON

ON

ON

SW1

SW2

12 34

12 34

SW3
12 34

SW4
12 34

S4
12

ON~OFF ON~OFF ON~OFF ON~OFF ON~OFF

FOR SETTING NETADDRESS

S1+S2

EF 0 1 2

ON

67 9A

8

12

CODE NETADDRESS

0~F 0~15

FACTORY SETTING

EF 0 1 2

ON

67 9A

8

12

0~F

16~31

EF0 12

ON

67 9A

8

12

0~F

32~47

BCD

EF 0 1 2

ON

67 9A

8

12

0~F

48~63

CN43 CN46 CN6 CN29
Output:24VAC Output:5VDC Output:5VDC Output:5VDC

CN12 Output:24VAC

CN23CN33 CN5 CN21

Output:24VAC Output:220VAC
CN9 CN22 CN10

Output:12VDC

Output:15VDC

6

WATER LEVEL SWITCH

Output:5VDC

J1

INDOOR UNIT MAINBOARD

RED TRANS RED

ALARM WORK

DRY CONTACT DRY CONTACT
CN18

L and N :230VAC S and N :0-24VDC
N LS
CN11

BLUE 2

RED

Y/G

3

NOTE2:

RED

1.The other switches should be set as

“Off” state from factory.

2.The specific use of the switches please

2

reference to the Dial Code tables.

L1cL2cSc

3.The CN5/CN23/CN33 connect to left and right terminals.

Y/G

FOR SETTING POWER(DC MOTOR MODEL ONLY)

TO OUTDOOR UNIT

F01

F01

F01

F01

F01

F01

F01

A BCDE A BCDE A BCDE A BCDE A BCDE A BCDE A BCDE

23 456 23 456 23 456 23 456 23 456 23 456 23 456

ENC1

79

79

79

79

79

79

79

8

8

8

8

8

8

8

CODE

4

5

7

8

CAPACITY 53

54~71 72~90 91~105

FACTORY SETTING

ACCORDING TO RELATED MODEL.

9 106~140

A 141~160

B 161

Remote Control

4

Output:+12VDC ON/OFF
CN2

CN7 CN14
Output:+15VDC Output:+12VDC

JR1
Output:24VAC Output:24VAC Output:24VAC Output:24VAC CN6 CN9 CN10 CN11

B W W1

W2

E/AUX

DH

Output:+5VDC
CN3 E Y X

24V THERMOSTAT
16023000A74404

TCoomCCmM.Bus

TO THE WIRE

CONTROLLER

36-60K Units

485 PORT

Output:24VAC Output:24VAC Output:+15VDC BCD

CN23CN33 CN5 CN21
T1
T2A T2B
T2 Output:12VDC
CN34 Output:220VAC
CN15

345 345 345 345 23456
Page 26

NOTE1:

WIRING DIAGRAM

24V THERMOSTATS SETTING

A BCDE BCD

1.The parts with dotted line indicates CODE PART NAME

optional features. 2.Remove the short connector of JR1

ECM

INDOOR ECM MOTOR

F01
S3

ON
SW1

ON
SW2

ON
SW3

ON
SW4

ON
S4

79

when you use the “on-off” function. T1

3.Remove the short connector of J1 when you use the “WATER LEVEL SWITCH” function.

T2 T2A

4. This symbol indicates the element T2B

ROOM TEMP.SENSOR COIL TEMP.SENSOR INDOOR COIL INLET TEMP.SENSOR INDOOR COIL OUTLET TEMP.SENSOR

CODE FACTORY SETTING

8
0~F

12 34

12 34

12 34

12 34

12

ON~OFF ON~OFF ON~OFF ON~OFF ON~OFF

is optional, the actual shape shall prevail.

FOR SETTING NETADDRESS

UVLED OUTPUT

ECM M
2 4(3) 3

BCD

BCD

HEATER

S1+S2

EF 0 1 2

ON

EF 0 1 2

ON

EF0 12

ON

EF 0 1 2

ON

67 9A

67 9A

67 9A

67 9A

8

12

8

12

8

12

8

12

CODE

0~F

NETADDRESS

0~15

3

FACTORY

0~F 16~31

0~F 32~47

0~F 48~63

SETTING

CN43 CN46 CN6 CN29
Output:24VAC Output:5VDC Output:5VDC Output:5VDC

CN12
Output:24VAC

Output:24VAC Output:220VAC
CN9 CN22 CN10

WATER LEVEL SWITCH

Output:12VDC

Output:5VDC

J1

INDOOR UNIT MAINBOARD

Output:15VDC

6 RED TRANSRED

ALARM WORK

DRY CONTACT DRY CONTACT
CN18

CN20 S1 S2

L and N :230VAC
NL CN11

BLUE
2

RED

NOTE2:

Y/G

1.The other switches should be set as

“Off” state from factory.

2.The specific use of the switches please

reference to the Dial Code tables.

COMMUNICATION

3.The CN5/CN23/CN33 connect to left and right terminals.TO OUTDOOR UNIT

RED

BLACK

2
2
L1 L2

Y/G

FOR SETTING POWER(DC MOTOR MODEL ONLY)

TO OUTDOOR UNIT

F01

F01

F01

F01

F01

F01

F01 OR POWER

ENC1

A BCDE A BCDE A BCDE A BCDE A BCDE A BCDE

A BCDE

23 456 23 456 23 456 23 456 23 456 23 456 23 456

79

79

79

79

79

79

79

8

8

8

8

8

8

8

CODE

4

5

7

8

CAPACITY 53

54~71 72~90 91~105

FACTORY SETTING

ACCORDING TO RELATED MODEL.

9 106~140

A 141~160

B 161

CN4 CN5 CN1

CONTROLLER

TO THE WIRE

Remote Control

L Output:+12VDC
G

4

R C

Y1

Y/Y2

ON/OFF CN2

CN7

Output:+15VDC

JR1
Output:24VAC Output:24VAC Output:24VAC Output:24VAC CN6 CN9 CN10 CN11

B W W1

W2

E/AUX

DH

CN14
Output:+12VDC
Output:+5VDC CN3 E Y X

24V THERMOSTAT
16023000A74403

TCoomCCmM.Bus

Wired Controller and Thermostat Connections

Wired Controller – M0STAT120N-1

DIP Switches

The maximun cable length when using multiple extension cables (sold separately) is 164 feet (50 meters). Do not cut or modify the wiring harness.
Refer to the following wiring diagram for indoor and outdoor unit communication with a wired controller.

Function Rotary switch

(S4)

Figure 8. Wired Controller Diagram
24V Thermostat
Refer to the following wiring diagram for indoor and outdoor unit communication with a 24V thermostat.

24V Thermostat Dip Switch Settings

Figure 9. 24V Thermostat Diagram

SW4 Dip Switch settings (Electric Heat Air Volume) adjusts the blower motor’s nominal CFM based on the electric heat kit size. See “Electric Heat Air Volume Settings” on page 28. 000 is the default setting. The following three-digit combinations can be used when implementing switch settings on indoor units with varying features, such as electric heating:

· 000 · 001 · 010 · 011

· 100 · 101 · 110
· 111

Page 27

Electric Heat Air Volume Settings

Air Handler Model No. 018 024 036 048 060

Air Volume DIP Switch Setting
000 (default) 001 010 011
000 (default) 001 010 011
000 (default) 001 010 011
000 (default) 001 010 011
000 (default) 001 010 011

Function Combination Table of SW1-1 and SW1-4

SW1

Control Type

Full System

Factory Combination

MMA + MPC/MLB + M0STAT120N-1

24V Thermostat

M30 or (2H/2C) 24V Thermostat

Air Volume (cfm)
660 630 600 570 880 850 830 800 1320 1255 1190 1125 1760 1675 1580 1490 – – 2055 1920 1775

Electric Heat kW
10 kW 8 kW, 10 kW
8 kW 5 kW 15 kW 8 kW, 15 kW 8 kW, 10 kW 5 kW 20 kW 15 KW 8 kW, 10 kW 8 kW, 5 kW 20 kW 10 kW, 15 kW 8 kW, 10 kW 8 kW – – 15 kW, 20 kW 10 kW, 15 kW 10 kW

Page 28

Dial Codes

NOTE: The SW4 DIP switch is for certified service technical use only.

No. Dial Code Control Scenario

Function

ON

OFF

Note

1

SW1-2

1,2

Anti-cold blow protection option

NO

[Default] YES

2

SW1-3

1,2,3

Cooling only applications / heat & cool applications

Cooling

[Default] Cooling & Heating

3

SW2-1

4

SW2-1

1

Compressor Running (demand working with

Compressor

[Default] Faster

Only affects

heat pump+ Electric heat)

slower speed

Compressor

compressor and

2

Temperature differential to activate first stage

2°F (1°C)

[Default] 4°F (2°C)

W1

auxiliary heat(the GAP of T1 and Ts),Wire

controller demand with heat pump+Electric

heat working together

5

SW2-2

2

Electric heat on delay

YES

[Default]NO

6

SW2-3

2

Electric auxiliary heating delay to start time

30 minutes

[Default] 15 minutes

Based on SW2-2 is activated ON

7

SW2-4

2

Compressor/Auxiliary heat outdoor ambient The compressor

[Default] The

SW2-4 and S3

lockout

will not operate

heater will

need to working

if the outdoor

not operate if

together

temperature is

the outdoor

lower than the

temperature is

temperature

greater than

represented by S3 the temperature

represented by S3

8

Rotary

2

Switch S3

Set outdoor temperature Limitation (for auxiliary heating or compressor)

0 means that the temperature protection is not turned on, the dial range is 1
through F, 1 equals -4°F and it increase up to 46°F. See “Table 2. Dial Range Table” on page 30.

9

SW3-1

1

Maximum continuous runtime allowed before

30 minutes

system automatically stages up capacity to

satisfy set point. This adds 1 to 5°F to the

user set point in the calculated control point to

increase capacity and satisfy user set point

[Default] 90 minutes

10

SW3-2

1

Cooling and heating Y/Y2 temperature differential adjustment.

Compressor slower speed

[Default] Faster Compressor

Only affects compressor

11

SW3-3

1

Compressor Running (demand working with

Compressor

[Default] Faster

Only affects

heat pump+ Electric heat)

slower speed

Compressor

compressor and

W2

12

SW3-3

2

Temperature differential to activate second

4°F (2°C)

[Default] 6°F (3°C)

stage auxiliary heating(the GAP of T1

and Ts)Wire controller demand with heat

pump+Electric heat working together

13

SW3-4

1,3

Fan speed of cooling mode when 24V Thermostat is applied for.

Turbo

High

14

SW4

1,2,3

Electric heat nominal CFM adjustment

Available settings are 000/001/010/011. Each digit corresponds an individual switch position.
For example [SW4-1 OFF, SW4-2 ON, SW4 -3 OFF] = 010

15

S4-1

1,3

Default ON

[Default] For single stage supplemental heat, W1 and W2 are connected

For dual stage supplemental heat, W1 and W2 are controlled independently

16

S4-2

1,3

DH function selection

[Default] Dehumidification
control not available

Dehumidification feature is enabled
through thermostat

Page 29

24V Thermostat,

1

S1 + S2

Control Scenario Wired Controller

2

S1 + S2

Full 24V

3

NOTE: S3 – Outdoor Temperature Limit (shown above)

S3

S3 (°F)

S3 (°C)

0

OFF

OFF

1

-4

-20

2

0

-18

3

3

-16

4

7

-14

5

10

-12

6

14

-10

7

18

-8

8

21

-6

9

25

-4

A

28

-2

B

32

0

C

36

2

D

39

4

E

43

6

F

46

8

Table 2. Dial Range Table

DIP Switch S1 and S2

Address dialing S1+S2: Address dialing is required when using the centralized controller.
Network address: · The address silkscreen is NET address, which is composed of a 16bit address rotary code S2 plus a two-digit DIP switch S1 (Set during engineering installation, no network function needs to be set)
· When S2 is 00 (the dialing code is not connected), the network address value is S2
· When S2 is 10 (corresponding to the switch of the hardware connected to the 10K resistor), the network address value is S2 plus 32
· Determined by dial code S2 1-10K 2-5.1K. When S2 is 01 (corresponding to the dial code of the 5.1K resistor connected to the hardware is turned on), the network address value is S2 plus 16
· When S2 is 11 (all dialing codes are on), the network address value is S2 plus 48.
NOTE: The SW4 DIP switch is for certified service technician use only.

Determined by Dial Code

S2 1-10K 2-5.1K

Dial code selection

Website address

Page 30

Mode

Priority G

Y1 Y/Y2

24V Input Terminal

B

W W1 W2

OFF

/

0

0

0

0

0

0

0

FAN

7

1

0

0

0

0

0

Cooling stage 1

1

0

0

0

0

0

Cooling stage 2 Dehumidification

1

0

0

0

0

6

1

0

0

0

0

0

Dehumidification

1

0

0

0

0

Heat pump stage 1

1

0

1

0

0

0

Heat pump stage 2

5

1

1

0

0

0

Heat pump stage 2

1

0

0

Electric heater kit 1

0

0

0

1

0

Electric heater kit 2

3

0

0

0

0

1

Electric heater kit 1 and kit 2

0

0

0

1

1

Heat pump stage 1 + Electric heater kit 1

1

0

1

0

1

0

Heat pump stage 1 + Electric heater kit 2

1

0

1

0

0

1

Heat pump stage 2 + Electric heater kit 1

1

1

0

1

0

Heat pump stage 2 + Electric heater kit 1

1

1

0

Heat pump stage 2 + Electric heater kit 2

1

1

0

0

1

Heat pump stage 2 +

4

Electric heater kit 2

1

0

1

Heat pump stage 1 + Electric heater kit 1
and kit 2

1

0

1

0

1

1

Heat pump stage 2 + Electric heater kit 1
and kit 2

1

1

0

1

1

Heat pump stage 2 + Electric heater kit 1
and kit 2

1

1

1

Emergency heat

1

Heating zone control

1

0

1

0

Heating zone control

1

1

0

Heating zone control

1

2

Heating zone control

0

0

0

1

0

Heating zone control

0

0

0

0

1

Heating zone control

0

0

0

1

1

NOTE:

1: 24V signal 0: No 24V signal *: 1 or 0. The air handler unit will turn off if the 24V input cannot meet the table.

E/AUX DH/DS/BK Fan speed

0

OFF

0

Low

0

1

Mid

0

1

High

0

0

Low

0

0

Low

0

1

Mid

0

1

High

0

1

High

0

Turbo

0

Turbo

Display
0 1 2 3 4 5 6
7
8

0

Turbo

9

0

1

Turbo

0

1

Turbo

0

1

Turbo

10

0

1

Turbo

0

1

Turbo

0

1

Turbo

0

1

Turbo

0

1

Turbo

11

0

1

Turbo

1

Turbo

12

0

0

Low

0

0

Low

0

0

Low

13

0

0

Low

0

0

Low

0

0

Low

Page 31

Outdoor Unit Included Parts
Package 1 of 1 contains the following: 1 – Assembled Outdoor Unit Packaging Content:

Parts

Figure

Quantity

Drain connector

1 ea.

Parts Seal ring

Figure

Quantity 1 ea.

Model Identification – Outdoor Unit

OUTDOOR SINGLE ZONE HEAT PUMP UNITS

M P C 018 S 4 S – 1 P
Series Type M = Mini-Split
Unit Type L = Low Ambient Heat Pump
P = Heat Pump

Voltage P = 208/230V-1 phase-60hz
Minor Design Sequence 1 = 1st Revision

Major Design Sequence A = 1st Generation B = 2nd Generation C = 3rd Generation
Nominal Cooling Capacity 018 = 1.5 tons 024 = 2 tons 036 = 3 tons 048 = 4 tons 060 = 5 tons

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

Page 32

OUTDOOR MULTI-ZONE HEAT PUMP UNITS
M P C 036 S 4 M – 1 P
Series Type M = Mini-Split
Unit Type L = Low Ambient Heat Pump
P = Heat Pump

Voltage P = 208/230V-1 phase-60hz
Minor Design Sequence 1 = 1st Revision

Major Design Sequence A = 1st Generation B = 2nd Generation C = 3rd Generation
Nominal Cooling Capacity 024 = 2 tons
030 = 2.5 tons 036 = 3 tons 048 = 4 tons

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

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.

Page 33

MPC Outdoor Unit Dimensions
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 10. MPC018S4S Outdoor 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 11. MPC024S4S, MPC030S4S, and MPC036S4S Outdoor Unit Dimensions – Inches (mm)

Page 34

27-7/8 (708) 25 (635)
3
(76) TOP VIEW

15-7/8 (403)

17-5/8 (448)

16-3/8 (416)

52-1/2 (1333)

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

SIDE VIEW

Figure 12. MPC048S4S and MPC060S4S Outdoor Unit Dimensions – Inches (mm)

MLB Outdoor Unit Dimensions

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

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

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

Figure 13. MLB018S4S Outdoor Unit Dimensions – Inches (mm)

Page 35

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 14. MLB024S4S Outdoor 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)

52-1/2 (1333)

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

SIDE VIEW

Figure 15. Outdoor Unit Dimensions (MLB036S4S-P and MLB048S4S-P) – Inches (mm)

Page 36

Outdoor Unit Electrical Data Single Zone

MLB048S4S-1P MLB036S4S-1P MLB024S4S-1P MLB018S4S-1P MPC060S4S-1P MPC048S4S-1P MPC036S4S-1P MPC024S4S-1P MPC018S4S-1P

Outdoor Unit Model

Minimum Circuit Ampacity (MCA)

17

22

30

36.6

39

16

25

40

40

Maximum over-current protection (MOCP)

25

30

45

50

50

25

35

50

50

Multi-Zone

MLB048S4M-1P MLB036S4M-1P MLB030S4M-1P MPC048S4M-1P MPC036S4M-1P MPC030S4M-1P MPC024S4M-1P

Outdoor Unit Model

Minimum Circuit Ampacity (MCA)

24.5

24.5

25

35

25

35

Maximum over-current protection (MOCP)

30

30

40

50

40

50

Air Volume Table

Capacity

External Static Pressure (ESP)
Range

Fan Speed

Electric Heater Kit

24V Thermostat
DIP Switch 24V Terminal Engaged

Cooling Turbo

– – –

SW3-4=ON

Y2/Y

Cooling High

– – –

SW3-4=OFF

Y2/Y

Cooling Medium

– – –

– – –

Y1

Cooling Low

– – –

– – –

– – –

Heat Pump

– – –

– – –

– – –

Turbo

Heat Pump

– – –

High

– – –

B+Y2/Y, W

Heat Pump

– – –

Medium

18K

0 – 0.80 in. w.g. Heat Pump Low

– – –

– – –

B+Y1

– – –

– – –

Electric Heater Kit 0 (Default)

10 kW

SW4-1=OFF SW4-2=OFF SW4-3=OFF

W1, W2, AUX

Electric Heater Kit 1

10 kW, 8 kW

SW4-1=OFF SW4-2=OFF SW4-3=ON

W1, W2, AUX

Electric Heater Kit 2

8 kW

SW4-1=OFF SW4-2=ON SW4-3=OFF

W1, W2, AUX

NOTE:

Electric Heater Kit 3

5 kW

SW4-1=OFF SW4-2=ON SW4-3=ON

W1, W2, AUX

The constant airflow volume motor is applied. The airflow volume is constant at all ESP within range.

Wired Controller

DIP Switch

Mode

– – –

Cool

– – –

Cool

– – –

Cool

– – –

Cool

– – –

Heat

– – –

Heat

– – –

Heat

– – –
SW4-1=OFF SW4-2=OFF SW4-3=OFF
SW4-1=OFF SW4-2=OFF SW4-3=ON
SW4-1=OFF SW4-2=ON SW4-3=OFF
SW4-1=OFF SW4-2=ON SW4-3=ON

Heat Heat + AUX,
AUX
Heat + AUX, AUX
Heat + AUX, AUX
Heat + AUX, AUX

35 50
Airflow Volume (CFM)
618 576 529 488 565 541 435 400 653
624
594
565

Page 37

Capacity

External Static Pressure (ESP)
Range

Fan Speed

Electric Heater Kit

24V Thermostat
DIP Switch 24V Terminal Engaged

Cooling Turbo

– – –

SW3-4=ON

Y2/Y

Cooling High

– – –

SW3-4=OFF

Y2/Y

Cooling Medium

– – –

– – –

Y1

Cooling Low

– – –

– – –

– – –

Heat Pump

– – –

– – –

– – –

Turbo

Heat Pump

– – –

High

– – –

B+Y2/Y, W

Heat Pump

– – –

Medium

24K

0 – 0.80 in. w.g. Heat Pump Low

– – –

– – –

B+Y1

– – –

– – –

Electric Heater Kit 0 (Default)

15kW

SW4-1=OFF SW4-2=OFF SW4-3=OFF

W1, W2, AUX

Electric Heater Kit 1

15kW, 10kW

SW4-1=OFF SW4-2=OFF SW4-3=ON

W1, W2, AUX

Electric Heater Kit 2

10kW, 8kW

SW4-1=OFF SW4-2=ON SW4-3=OFF

W1, W2, AUX

Electric Heater Kit 3

5kW

SW4-1=OFF SW4-2=ON SW4-3=ON

W1, W2, AUX

Cooling Turbo

– – –

SW3-4=ON

Y2/Y

Cooling High

– – –

SW3-4=OFF

Y2/Y

Cooling Medium

– – –

– – –

Y1

Cooling Low

– – –

– – –

– – –

Heat Pump

– – –

– – –

– – –

Turbo

Heat Pump

– – –

High

– – –

B+Y2/Y, W

Heat Pump

– – –

Medium

36K

0 – 0.80 in. w.g. Heat Pump Low

– – –

– – –

B+Y1

– – –

– – –

Electric Heater Kit 0 (Default)

20kW

SW4-1=OFF SW4-2=OFF SW4-3=OFF

W1, W2, AUX

Electric Heater Kit 1

15kW

SW4-1=OFF SW4-2=OFF SW4-3=ON

W1, W2, AUX

Electric Heater 2

10kW, 8kW

SW4-1=OFF SW4-2=ON SW4-3=OFF

W1, W2, AUX

NOTE:

Electric Heater Kit 3

5kW, 8kW

SW4-1=OFF SW4-2=ON SW4-3=ON

W1, W2, AUX

The constant airflow volume motor is applied. The airflow volume is constant at all ESP within range.

Wired Controller

DIP Switch

Mode

– – –

Cool

– – –

Cool

– – –

Cool

– – –

Cool

– – –

Heat

– – –

Heat

– – –

Heat

– – –
SW4-1=OFF SW4-2=OFF SW4-3=OFF
SW4-1=OFF SW4-2=OFF SW4-3=ON
SW4-1=OFF SW4-2=ON SW4-3=OFF
SW4-1=OFF SW4-2=ON SW4-3=ON
– – –
– – –
– – –
– – –
– – –

Heat Heat + AUX,
AUX
Heat + AUX, AUX
Heat + AUX, AUX
Heat + AUX, AUX
Cool Cool Cool Cool Heat

– – –

Heat

– – –

Heat

– – –
SW4-1=OFF SW4-2=OFF SW4-3=OFF
SW4-1=OFF SW4-2=OFF SW4-3=ON
SW4-1=OFF SW4-2=ON SW4-3=OFF
SW4-1=OFF SW4-2=ON SW4-3=ON

Heat Heat + AUX,
AUX
Heat + AUX, AUX
Heat + AUX, AUX
Heat + AUX, AUX

Airflow Volume (CFM)
824 759 694 629 788 753 641 524 871
841
818
788
1188 1082 971 865 1112 1059 794 582 1306
1241
1176
1112

Page 38

Capacity

External Static Pressure (ESP)
Range

Fan Speed

Electric Heater Kit

24V Thermostat
DIP Switch 24V Terminal Engaged

Cooling Turbo

– – –

SW3-4=ON

Y2/Y

Cooling High

– – –

SW3-4=OFF

Y2/Y

Cooling Medium

– – –

– – –

Y1

Cooling Low

– – –

– – –

– – –

Heat Pump

– – –

– – –

– – –

Turbo

Heat Pump

– – –

High

– – –

B+Y2/Y, W

Heat Pump

– – –

Medium

– – –

B+Y1

48K

0 – 0.80 in. w.g. Heat Pump Low

– – –

– – –

– – –

Electric heater kit
0 (Default)

20kW

SW4-1=OFF SW4-2=OFF SW4-3=OFF

W1, W2, AUX

Electric heater kit 1

15kW

SW4-1=OFF SW4-2=OFF SW4-3=ON

W1, W2, AUX

Electric heater kit 2

10kW, 8kW

SW4-1=OFF SW4-2=ON SW4-3=OFF

W1, W2, AUX

Electric heater kit 3

8kW

SW4-1=OFF SW4-2=ON SW4-3=ON

W1, W2, AUX

Cooling Turbo

– – –

SW3-4=ON

Y2/Y

Cooling High

– – –

SW3-4=OFF

Y2/Y

Cooling Medium

– – –

– – –

Y1

Cooling Low

– – –

– – –

– – –

Heat Pump

– – –

– – –

– – –

Turbo

Heat Pump

– – –

High

– – –

B+Y2/Y, W

Heat Pump

– – –

Medium

60K

0 – 0.80 in. w.g. Heat Pump Low

– – –

– – –

B+Y1

– – –

– – –

Electric heater kit 0
(Default)

20kW

SW4-1=OFF SW4-2=OFF SW4-3=OFF

W1, W2, AUX

Electric heater kit 1

15kW, 20kW

SW4-1=OFF SW4-2=OFF SW4-3=ON

W1, W2, AUX

Electric heater kit 2

10kW, 15kW

SW4-1=OFF SW4-2=ON SW4-3=OFF

W1, W2, AUX

NOTE:

Electric heater kit 3

10kW

SW4-1=OFF SW4-2=ON SW4-3=ON

W1, W2, AUX

The constant airflow volume motor is applied. The airflow volume is constant at all ESP within range.

Wired Controller

DIP Switch

Mode

– – –

Cool

– – –

Cool

– – –

Cool

– – –

Cool

– – –

Heat

– – –

Heat

– – –

Heat

– – –
SW4-1=OFF SW4-2=OFF SW4-3=OFF
SW4-1=OFF SW4-2=OFF SW4-3=ON
SW4-1=OFF SW4-2=ON SW4-3=OFF
SW4-1=OFF SW4-2=ON SW4-3=ON
– – –
– – –
– – –
– – –
– – –
– – –

Heat Heat + AUX,
AUX
Heat + AUX, AUX
Heat + AUX, AUX
Heat + AUX, AUX
Cool Cool Cool Cool Heat
Heat

– – –

Heat

– – –
SW4-1=OFF SW4-2=OFF SW4-3=OFF
SW4-1=OFF SW4-2=OFF SW4-3=ON
SW4-1=OFF SW4-2=ON SW4-3=OFF
SW4-1=OFF SW4-2=ON SW4-3=ON

Heat Heat + AUX,
AUX
Heat + AUX, AUX
Heat + AUX, AUX
Heat + AUX, AUX

Airflow Volume (CFM)
1471 1282 1094 906 1471 1306 1141 976 1741
1653
1559
1471
1806 1582 1359 1135 1659 1582 1247 976 2171
2029
1894
1753

Page 39

Outdoor Unit Clearances

24 (610)

Air Inlet
1 12 (305)

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.
Figure 16. Outdoor Unit Clearances – Inches (mm) – (Typical)

Torque Requirements for Caps and Fasteners
When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. “Table 3. Torque Requirements” provides torque values for fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc – Rockwell scale minimum). Fully insert the wrench into the valve stem recess.
Service valve stems are factory-torqued from 9 ft.-lbs. (12 N*m) 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.

Parts
Service valve cap Sheet metal screws Machine screws #10 Compressor bolts Gauge port seal cap
Flare Nut 1/4 3/8 1/2 5/8

Table 3. Torque Requirements
Recommended Torque U.S. 8 ft.-lb. 16 in.-lb. 27 in.-lb. 7 ft.-lb. 8 ft.-lb. U.S. 15 ft.-lb. 26 ft.-lb. 41 ft.-lb. 48 ft.-lb.

Newton-Meter- N 11 2 3 10 11
Newton-Meter- N 20 35 56 65

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).

Page 40

· 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
Ground Level
Figure 17. Install Unit Level (Typical) · Choose a place solid enough to bear the weight and vibration of the unit, where the operation noise will not be ampli-
fied. · Choose a location where the hot air discharged from the unit or the operation noise will not be a nuisance to neighbors. · 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 dam-
aged 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 18. Outdoor Unit on Pedestal (Stand) and Protective Canopy (Typical)” or “Figure 23. Dog House-Style Shelter (Typical)” on page 43.
IMPORTANT
The construction of a canopy or shade is recommended 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 18. Outdoor Unit on Pedestal (Stand) and Protective Canopy (Typical)”. · The unit base should be elevated above the depth of average snows as illustrated in “Figure 19. Outdoor Unit on
Brackets above Snow Line (Typical)”. · In heavy snow areas, do not place the unit where drifting will occur as illustrated in “Figure 20. Outdoor Unit Air Flow
Obstructed by Snow (Typical)”. · 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 21. Avoid Defrost Water Ice Hazard (Typical)”.
Page 41

Protective canopy

Protective canopy

Air Outlet
Pedestal (stand)

12 in 305 mm
Air Inlet

24 in 610 mm
Pedestal (stand)

Side View

Front View

Figure 18. Outdoor Unit on Pedestal (Stand) and Protective Canopy (Typical)

Air Outlet

Air Inlet

Figure 19. Outdoor Unit on Brackets above Snow Line (Typical)

79 in 2007 mm
Air Outlet

12 in 305 mm
Air Inlet

Figure 21. Avoid Defrost Water Ice Hazard (Typical)
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 16. Outdoor Unit Clearances – Inches (mm) – (Typical)” on page 40 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 22. 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 22. Wind Barrier”.
· Outdoor unit can be installed in a dog house style shelter as illustrated in “Figure 23. Dog House-Style Shelter (Typical)”.
· Outdoor unit can be installed in a alcove or under a roof overhang as illustrated in “Figure 24. Unit installed in Alcove (Typical)”.
Prevailing Winter Winds from Air Inlet Side

Wind Barrier Inlet Air

12″ (305mm) Min. Distance

Figure 20. Outdoor Unit Air Flow Obstructed by Snow (Typical)

79″ (2007mm) Discharge Air Min. Distance Wind Barrier
Prevailing Winter Winds From Air Discharge Side
Figure 22. Wind Barrier

Page 42

12 in 305 mm

24 in 610 mm

24 in 610 mm

12 in 305 mm

NOTE – Minimum clearances shown.
Figure 23. Dog House-Style Shelter (Typical)

24 in 610 mm

12 in 305 mm

12 in 305 mm
24 in 610 mm
NOTE – Minimum clearances shown.
Figure 24. Unit installed in Alcove (Typical)
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.
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.

Drain Connector

Chassis

Condensate Drain (location varies per model)

Figure 25. Condensate Drain (Typical)
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.

Four Field-provided Anchor Bolts
Figure 26. Securing Outdoor Unit to Slab (Typical)
Four Field-Provided Anchor Bolts

Figure 27. Securing Outdoor Unit to Rails (Typical) Page 43

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 28. Securing Outdoor Unit to Brackets (Typical)

Page 44

Refrigerant Line Minimum and Maximum Elevations
Single Zone Piping Limitations Figure 29. Refrigerant Line Minimum and Maximum Elevations

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

NOTE: See “Oil Trap” on page 16.

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.

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

Outdoor Unit Size (KBtu)
018 024 / 30 036 / 048 / 060

Line Set Diameters (in.)

Liquid

Gas

1/4

1/2

3/8

5/8

3/8

5/8

Maximum Elevation Outdoor Unit BELOW Indoor Unit – Feet (Meter)
66 (20)
82 (25)
98 (30)

Maximum Elevation Outdoor Unit ABOVE Indoor Unit – Feet (Meter)
66 (20)
82 (25)
98 (30)

Maximum Line Set Length Feet (Meter)
98 (30) 164 (50) 213 (65)

Multi-Zone Piping Limitations
CAUTION
In order to avoid injury, take proper precaution when lifting heavy objects.

IMPORTANT
Pipe and wire to each zone separately.
Test each indoor unit separately to ensure proper operation.

Connecting Multiple Capacity Indoor Units · The largest capacity indoor unit must be connected to the lowest refrigerant connection ports on the outdoor unit.
· The 24,000 Btu indoor unit is only allowed to be connected to MPC036S4M, MPC048S4M, MLB036S4M and MLB048S4M outdoor units.
NOTE: Each indoor unit must be piped AND wired to the correct zone piping connections and wiring terminals. Make sure that indoor unit A is wired to the zone A terminal block and connected to the appropriate refrigerant pipe connections.

Connecting Multiple Capacity Indoor Units
C(1/4in) C(3/8in) B(1/4in) B(3/8in) A(1/4in) A(1/2in)
Four-Zone System Example Shown Above

Page 45

Pipe and Wire Each Zone Separately

outdoor

wire A B C D

pipe Unit D Unit C

L4(ft) L3(ft)

Unit B L2(ft)

indoor
Unit D Unit C Unit B

Unit A L1(ft)

Unit A

INDOOR UNIT

INDOOR UNIT

INDOOR UNIT
NOTE – Minimum Line Set Length – 10 ft. (3 m) per Indoor Unit NOTE – Maximum Line Set Length Includes ALL piping in measurement Maximum Line Set Furthest Indoor Unit
INDOOR UNIT

Maximum
Elevation – 49 ft. Outdoor Unit (15 m)
BELOW
Indoor Units

OUTDOOR UNIT

NOTE – Maximum Difference in Elevation Between Indoor Units – 33 ft. (10 m).
NOTE – See “Oil Trap” on page 16.

Maximum Elevation Outdoor Unit ABOVE Indoor Unit

49 ft. (15 m)

INDOOR UNIT

Figure 30. MPC and MLB Line Set Elevations

Outdoor Unit Model No.

MPC024SM

MLB030S4M / MPC030S4M

MLB036S4M / MPC036S4M

Maximum Number of Indoor Units/Zones

Three

Three

Four

Indoor Unit Connections

(3) 1/4 liq. (3) 3/8 gas

(3) 1/4 liq. (3) 3/8 gas

(4) 1/4 liq. (3) 3/8 gas (1) 1/2 gas

Maximum Pipe Length for all Rooms

197 ft. (60 m)

197 ft. (60 m)

262 ft. (80 m)

Maximum Line Set Length – Furthest Indoor Unit

98 ft. (30 m)

98 ft. (30 m)

115 ft. (35 m)

NOTE: Refer to Table 4 on page 46 for correct refrigerant line adapters furnished with outdoor units.

MLB048S4M / MPC048S4M
Five
(5) 1/4 liq. (3) 3/8 gas (2) 1/2 gas
262 ft. (80 m)
115 ft. (35 m)

Number of Zones 3

Model
MPC024S4M-P MPC030S4M-P

Table 4. Line Set Adapters
Number x Liquid side/ Gas side (inch)
3 X (1/4″/3/8″)

Adapter 3/8″–>1/2″

Adapter Quantity 3

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Number of Zones 4 5 3 4 5

Model MPC036S4M-P MPC048S4M-P MLB030S4M-P MLB036S4M-P MLB048S4M-*P

Table 4. Line Set Adapters
Number x Liquid side/ Gas side (inch)
3x (1/4″/3/8″) & 1x (1/4″/1/2″)
3x (1/4″/3/8″) & 2x (1/4″/1/2″)
3x (1/4″/3/8″)
3x (1/4″/3/8″) & 1x (1/4″/1/2″)
3x (1/4″/3/8″) & 2x (1/4″/1/2″)

Adapter
3/8″–>1/2″ 1/2″–>3/8″ 1/4″–>3/8″ 1/2″–>5/8″ 1/2″–>3/8″ 1/4″–>3/8″ 1/2″–>5/8″ 3/8″–>1/2″ 3/8″–>1/2″ 1/2″–>3/8″ 1/4″–>3/8″ 1/2″–>5/8″ 3/8″–>1/2″ 1/2″–>3/8″ 1/4″–>3/8″ 1/2″–>5/8″ 1/2″–>3/8″ 1/4″–>3/8″ 1/2″–>5/8″ 3/8″–>1/2″

Adapter Quantity
3 1 1 1 2 2 2 3 2 1 1 1 2 2 2 2 2 2 2 3

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 5. Additional Refrigerant Charge (Single Zone)

Outdoor Unit Size (KBtu)

Pipe Length (feet / meters)

Amount of Refrigerant to add

18

25 (7.5)

0.16 oz/ft (15g/m)

24

25 (7.5)

0.32 oz/ft (30g/m)

30

25 (7.5)

0.32 oz/ft (30g/m)

36

25 (7.5)

0.32 oz/ft (30g/m)

48

25 (7.5)

0.32 oz/ft (30g/m)

60

25 (7.5)

Note: 1/4″ = 0.16 oz/ft; 3/8″ = 0.32 oz/ft

0.32 oz/ft (30g/m)

Table 6. Additional Refrigerant Charge (Multi-Zone)

System

Pre-charge Pipe Length

Amount of Refrigerant to add

Two-port

50 ft. (15 m)

0.16 oz ((L1 ft + L2 ft) – 50 ft) 0.005 kg ((L1 m + L2 m) – 15 m)

Three-port 75 ft. (23 m)

0.16 oz ((L1 ft + L2 ft + L3 ft) – 75 ft)
0.005 kg ((L1 m + L2 m + L3 m) 23 m)

Table 6. Additional Refrigerant Charge (Multi-Zone)

System

Pre-charge Pipe Length

Amount of Refrigerant to add

Four-port

100 ft. (30 m)

0.16 oz ((L1 ft + L2 ft + L3 ft + L4 ft) – 100 ft)
0.005 kg ((L1 m + L2 m + L3 m + L4 m) – 30 m)

Five-port

125 ft. (38 m)

0.16 oz ((L1 ft + L2 ft + L3 ft + L4 ft + L5 ft) – 125 ft)
0.005 kg ((L1 m + L2 m + L3 m + L4 m + L5 m) – 38 m)

Leak Test and Evacuation
This procedure is performed after all connections both plumbing and wiring are completed. 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 non-condensables and moisture from the system.

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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.

24 hours. Lower system pressure test, 5 32 470 3241 after confirmation No. 4 was successfully
completed.

Triple Evacuation Procedure
A Micron gauge must be used for this procedure. 1. Discharge the oxygen-free nitrogen and evacuate the
system to a reading of 8000 Microns using all service valves. 2. Break the vacuum by allowing nitrogen into the port connections (liquid and gas line pipes) until a positive pressure is achieved. 3. Evacuate the system to a reading of 5000 Microns. 4. Break the vacuum by allowing nitrogen into the port connections (liquid and gas line pipes) until a positive pressure is achieved. 5. Evacuate the system to a minimum reading of 500 Microns. 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.
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 3. Torque Requirements” on page 40. See “Table 5. Additional Refrigerant Charge (Single Zone)” on page 47 for multi-zone zone applications. 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.
Test Run
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 liquid and gas 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:

Checks

Table 8. Test Run Checklist

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

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Error Codes

Table 9. MLB and MPC Multi-Zone Outdoor Unit Error Codes

Display Malfunction and Protection Indication

EL01

Communication malfunction between indoor and outdoor units.

FL14

Capability mismatch between indoor unit and outdoor unit

EC50 EC51 EC52 EC53
EC54

Outdoor temperature sensor error. Outdoor EEPROM error. Condenser coil temperature sensor (T3) malfunction. Outdoor ambient temperature sensor (T4 ) malfunction. 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 PC12

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

PC30 System high pressure protection

PC31 System low pressure protection

Table 9. MLB and MPC Multi-Zone Outdoor Unit Error Codes

Display Malfunction and Protection Indication

PC40

Communication error between outdoor main chip and compressor driven chip

PC42 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)

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