Carrier 40MBAB Air Handler Unit Ductless System Installation Guide

40MBAB Air Handler Unit Ductless System
Installation Guide

40MBAB Air Handler Unit Ductless System

NOTE: Read the entire instruction manual before starting the installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions  which may cause death, personal injury or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing and work gloves. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in the literature and attached to the unit. Consult the local building codes and the current editions of the National Electrical Code (NEC) NFPA 70.
In Canada, refer to the current editions of the Canadian Electrical Code CSA C22.2 No. 60335-2-40. Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instruction manuals, be of the potential for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or death. Before installing or servicing the unit, always turn off all power to the unit. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Lock out and tag the  switch with a suitable warning label.
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing and gloves when handling parts.
MODEL NUMBERS AND ACCESSORIES
WARNING
EXPLOSION HAZARD
Failure to follow this warning could  result in death, serious personal injury, and/or property damage.
Never use air or gases containing oxygen for leak testing or operating refrigerant compressors. Pressurized mixtures of air or gases containing oxygen can lead to an explosion.
WARNING
INSTALLATION
Entrust a licensed contractor to install the unit. Installation by unskilled persons may lead to improper installation, electric shock, or fire. Re- installation must be performed by authorized professionals. Non-compliance may lead to electric shock or fire.
CAUTION
This unit is NOT equipped with a single point electrical connection for an Auxiliary Heat Package. A separate power supply is required for the Auxiliary Heat Package.
Table 1 — Indoor Unit Model Numbers

CAUTION
This unit is NOT equipped with a single point electrical connection for an Auxiliary Heat Package. A separate power supply is required for the Auxiliary Heat Package.
ACCESSORIES
The system is shipped with the following accessories (see Table 2). Use all of the installation parts and accessories to install the system. Improper installation may result in water leakage, electrical shock and fire, or cause the equipment to fail. Keep the installation manual in a safe place and do not discard any accessories until the installation is complete.
Table 2 — Accessories

| 2
**** Wireless Remote Controller|

| **** 1
Batteries|

| 2
Suction Line Flare to Weld Adapter 7/8” (60K Models Only)|

| 1
Wired Remote Controller|

| **** 1
Zip Ties|

| 2
Coil Foam Tape| ****| 4
Liquid Line Flare to Weld Adapter 3/8” (60K Models Only)|

| **** 1

Indoor Unit Parts DIMENSIONS Table 3 — Model A

Table 4 — Recommended Filter Size

INSTALLATION REQUIREMENTS

Review the following information before installing the unit:

• Do not install the indoor units near a direct source of heat such as direct sunlight or a heating appliance.
• Allow sufficient space for airflow and unit servicing. See Fig. 8 — on page 6 for the minimum required distances between the unit and the walls or ceilings.
• Communication wiring must be at least 3 ft. (1m) away from all electromagnetic interference (televisions, radios, etc.) sources. Interference is still possible even if this distance is maintained.
• Ensure any hanger used is strong enough to withstand the unit’s weight.
•  If the indoor unit is installed in an unconditioned space, running for long periods of time when the temperatures are outside the recommended indoor unit operation ranges, it is recommended that the installer seal all corners of the indoor unit to prevent any leaks and add insulation material (13/32 to 13/16 in (10-20 mm)) to the entire surface of the indoor unit to avoid condensation or heat transfer.

NOTE: Nuisance sweating may occur if the unit is installed in a high humidity environment with low airflow.
Table 5 — Operating Range

OPERATING RANGE (Min/Max °F (°C))

| Cooling| Heating
Indoor DB| 62 / 90 (17 / 32)| 32 / 86 (0 / 30)
Indoor WB| 59 / 84 (15 / 29)| N/A

WARNING
PRODUCT INSTALLATION

• Installation must be performed by an authorized dealer or specialist. A defective installation can cause water leakage, electrical shock, or fire.
• The installation must be performed according to the installation instructions. Improper installation can cause water leakage, electrical shock, or fire. (In North America, installation must be performed in accordance with the requirements of NEC or CEC by authorized personnel only.)
• Contact an authorized service technician for repair or maintenance of this unit. This appliance must be installed in accordance with local codes.
•  Only use the included accessories, parts, and specified parts for installation. Using non-standard parts can cause water leakage, electrical shock, fire, or unit failure.
• Install drainage piping according to the instructions in this manual and in accordance with local codes. Improper drainage may cause water damage to your home and property. • For units that have an auxiliary electric heater installed, ensure 1″ of clearance from any combustible materials for first 3 feet (1 meter) of plenum and duct work exiting the unit.
• DO NOT install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates around the unit, it may cause a fire.
•  DO NOT turn on the power until all work has been completed.
• When moving or relocating the system, consult experienced service technicians for the disconnection and re-installation of the unit.

NOTE: DO NOT install the indoor or outdoor units in a location with special environmental conditions. For those applications, contact your Ductless representative.
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.
CAUTION
Install the  indoor and outdoor units, cables and wires at least 3.2 ft (1m) from televisions, routers, computer equipment or radios to prevent static or image distortion. Depending on the appliances, a 3.2 ft (1m) distance may not be sufficient.
If the indoor unit is installed on metal, it must be electrically grounded.

INSTALLATION

Step 1 – Check Equipment
Unpack the unit and move to the final location. Remove the carton, taking care not to damage the unit. Inspect the equipment for damage prior to installation. File a claim with the shipping company if the shipment is damaged or incomplete. Locate the unit rating plate, which contains the proper installation information. Check the rating plate to be sure the unit matches the job specifications.
The indoor unit should be installed in a location that meets the following requirements:

• Enough room for installation and maintenance
• Enough room for the lineset and drainpipe
• A structure that can sustain the weight of the indoor unit
• The air inlet and outlet are not impeded
• There is no direct radiation from heaters

CAUTION
DO NOT install the unit in the following locations:

• Areas with oil drilling or fracking
• Coastal areas with high salt content in the air
• Areas with caustic gases in the air, such as near hot springs
• Areas with power fluctuations, such as factories
• 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.

Step 2 – Mount Unit
The unit can stand or lie on the floor, or hang from a ceiling or a wall. Allow space for wiring, piping, and servicing the unit.
IMPORTANT: When the unit is installed over a finished ceiling and/ or living area, building codes may require a field-supplied secondary condensate pan to be installed under the entire unit. Some localities may allow as an alternative, the running of a separate, secondary condensate line. Consult the local codes for additional restrictions or precautions.
NOTE: Nuisance sweating may occur if the unit is installed in a high humidity environment with low airflow. Step 3- Mount Positions MORE REQUIREMENTS:
Air supply and return may be handled in one of several ways best suited to the installation. 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 to be a problem, sound absorbing liner should be used inside the duct.
Duct must be insulated 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 connection 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.
CAUTION
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.
INSTALLATION DIRECTION SELECTION
The units can be installed in a vertical (down and up) and Horizontal (right and left) configuration. NOTE: For horizontal installation a secondary drain pan (field supplied) must be installed.
AIRFLOW DIRECTION FOR DIFFERENT INSTALLATION LOCATIONS NOTE: Vertical up and horizontal left installation does not need to change the direction of evaporator.
CONNECTING WIRE AND PIPES
Follow these steps to perform vertical down installation and horizontal right installation.

1. Open the upper cover.
2.  Open the electronic control box cover.
3. Connect the wire according to the wiring diagram.
4. Connect the pipes and install the drainage pipes.

DOWNFLOW AND HORIZONTAL RIGHT INSTRUCTIONS
NOTE: The unit may be installed in one of the upflow, downflow, horizontal left or horizontal right orientations.

1. Remove the filter door.

2. Remove the upper cover assembly.

3. Remove the evaporator cover plate.

4. Indication of the position of each temperature sensor of the evaporator (confirm your model).

5. Unplug temperature sensors T1,T2 from the control board.
   •T1: Room temperature sensor
   •T2: Evaporator central sensor plug

6. Remove the T1,T2 sensor wire ties,

7. Remove the evaporator and drain pan then rotate 180° (when your equipment needs to be a vertically downed configuration).

8. Adjust the mounting parts position according to the direction of equipment.

9. Reinstall the evaporator and drain pan.

10. Reinstall T1, T2 sensor plug and tie up the sensor wires. NOTE: The wire body needs to pass through the wire groove from the drain pan and applied to the drain pan’s hook.

11. The evaporator is assembled in place.

12. Use cable ties to fix the room temperature sensor.

13. Reinstall evaporator cover plate.

14. Connect the wire according to the wiring diagram.

15. Reassemble the upper cover and reinstall the filter and filter cover plate.

CAUTION
CAUTION FOR ALL PIPE INSTALLATIONS
The drainpipe is used to drain water away from the unit. If the drainpipe is bent or installed incorrectly, water may leak and cause a water-level switch malfunction.
In HEAT mode, the outdoor unit discharges water. Ensure that the drain hose is placed in an appropriate area to avoid water damage and icy conditions on walkways.
DO NOT pull the drainpipe forcefully, doing so may disconnect it.
NOTE: If installed above a finished living space, a secondary drain pan (as required by many building codes), must be installed under the entire unit and its condensate drain line must be routed to a location such that the user witnesses  the condensate discharge.
Step 4 – Installing Ductwork
Connect the supply-air duct over the outside of the 3/4in (19 mm) flanges provided on the supply-air opening. Secure the duct to the flange, using proper fasteners for the type of duct used, and seal duct-to-unit joint. If the return-air flanges are required, install the factory-authorized accessory kit. Use flexible connectors between the ductwork and unit to prevent transmission of vibration. When the electric heater is installed, use heat resistant material for the flexible connector between the ductwork and the unit at the discharge connection. Ductwork passing through the unconditioned space must be  insulated and covered with a vapor barrier. Units equipped with 20kW or greater electric heaters require a 1in (25mm) clearance to combustible materials for the first 36in (914mm) of supply duct. Follow the local codes.
DUCTWORK ACOUSTICAL TREATMENT
Metal duct systems that do not have a 90 degree elbow and 10ft (3m) of main duct to first branch takeoff may require internal acoustical insulation lining. As an alternative, fibrous ductwork may be used if constructed and installed in accordance with the latest edition of the SMACNA construction standard on fibrous glass ducts. Both acoustical lining and fibrous ductwork shall comply with the National Fire Protection Association as tested by UL Standard 181 for Class 1 air ducts. The air supply and return may be handled in one of several ways; whichever situation is best suited for the installation (See Fig. 5 — on page 3). A large number of issues encountered with split-system installations can be linked to improperly designed or installed duct systems. It is therefore very important that the duct system be properly designed and installed.
Use of flexible duct collars is recommended to minimize the transmission of vibration/noise into the conditioned space. Where the return air duct is short, or where sound is liable to be a problem, sound absorbing glass fiber should be used inside the duct.
Insulation of duct work must be installed according to local codes and best practices. The supply air duct should be properly sized by use of a transition to match unit opening.
This unit is not designed for non-ducted (free blow) applications.
NOTE: Duct work should be fabricated and installed in accordance with local and/or national codes.![Carrier 40MBAB Air Handler Unit Ductless System

• Collar Connection](https://manuals.plus/wp-content/uploads/2023/12/Carrier- 40MBAB-Air-Handler-Unit-Ductless-System-Collar-Connection.png) Step 5 – Condensate Drains
  The drainpipe is used to drain water away from the unit. Improper installation may cause unit and property damage.
  CAUTION

  • Insulate suction line to prevent condensation, which could lead to water damage. Check the local codes.
  • If the drainpipe is bent or installed incorrectly, water may leak and cause a water-level switch malfunction.
  •  In HEAT mode, the outdoor unit may discharge water. Ensure that the outdoor drain will not contribute to damage and slippage.
  • DO NOT pull the drainpipe forcefully. This could disconnect it.

NOTE: Installation requires adapting the locally sourced drain line to a “3/4” NPT female pipe thread connection.
INDOOR DRAINPIPE INSTALLATION

1. Cover the drainpipe with insulation, as required, to prevent condensation and leakage. These units operate with a positive pressure at the drain connection and a drain trap is required. The trap  needs to be installed as close to the unit as possible. Ensure the top of the trap is below the connection to the drain pan to allow complete drainage of the pan. NOTE: Horizontal runs must also have a drain trap installed ahead of the horizontal run to eliminate air trapping.
   NOTE: When using an extended drainpipe, tighten the indoor connection with an additional protection tube to prevent it from pulling loose.

2. Hand tighten the plug(s) for drain holes that are unused, Incorrect installation may cause water to flow back into the unit and flood.

3.  Use a 1” core drill to drill a hole in the wall. Make sure the hole is drilled at a slight downward angle, so that the outdoor end of the hole is lower than the indoor end by about 0.5in (12mm) (see Figure 32. This will ensure proper water drainage. Place the protective wall cuff in the hole. This protects the edges of the hole and helps seal the hole once the installation is complete. NOTE: When drilling the hole, make sure to avoid wires, plumbing, and other sensitive components.

4.  Pass the drain hose through the wall hole. Ensure the water drains to a safe location where it will not cause water damage or a slipping hazard.
   NOTE: The drainpipe outlet should be at least 2in(5cm) above the ground. If it touches the ground, the unit may become blocked and malfunction. If you discharge the water directly into a sewer, make sure that the drain has a U or S pipe to catch odors that might otherwise come back into the house. Follow the local plumbing codes.

Step 6 – Refrigerant Piping
IMPORTANT: Suction line must be insulated.

• The minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m).
• Table 6 lists the pipe sizes for the indoor unit. Refer to the outdoor unit’s installation instructions for the additional allowed piping lengths and refrigerant information.
• Refer to the outdoor unit’s installation manual for details regarding the allowable pipe length and height difference.

Table 6 — Piping Size

| | 18K| 24K| 30K| 36K| 48K| 60K
---|---|---|---|---|---|---|---
Gas Pipe (Connection Size)| In (mm)| 1/2 (13)| 5/8 (16)| 5/8 (16)| 5/8 (16)| 5/8 (16)| 7/8 (22)
Liquid Pipe (Connection Size)| In (mm)| 1/4 (6)| 3/8 (9.52)| 3/8 (9.52)| 3/8 (9.52)| 3/8 (9.52)| 3/8 (9.52)

WARNING
All field piping must be completed by a licensed technician and must comply with the local and national regulations.
When the system 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 hazardous. Ensure there is no refrigerant leakage after completing the installation work.
CAUTION
DO NOT install the connecting pipe until both the indoor and outdoor units have been installed.
Insulate suction line to prevent condensation.
Use the following steps to connect the refrigerant piping:

1. Run the interconnecting piping from the outdoor unit to the indoor unit.

2.  Connect the refrigerant piping and drain line outside the indoor unit. Complete the pipe insulation at the flare connection then fasten the piping and wiring to the wall as required. Completely seal the hole in the wall.

3. Cut tubing to correct length.
   When preparing refrigerant pipes, take extra care to cut and flare them properly. This ensures efficient operation and minimizes the need for future maintenance.
   a. Measure the distance between the indoor and outdoor units.
   b. Using a pipe cutter, cut the pipe a little longer than the measured distance.
   c. Ensure the pipe is cut at a perfect 90° angle. CAUTION
   DO NOT DEFORM PIPE WHILE CUTTING
   Be extra careful not to damage, dent, or deform the pipe while cutting. This drastically reduces the heating efficiency of the unit.

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

5. Flare Pipe Ends
   Proper flaring is essential to achieving an airtight seal.
   a. After removing the burrs from the cut pipe, seal the ends with PVC tape to prevent foreign materials from entering the pipe.
   b. Sheath the pipe with insulating material.
   c. Place flare nuts on both ends of the pipe. Ensure they are facing the right direction. Once the ends are flared, it is impossible to put them on or change their direction. d. Remove the PVC tape from ends of pipe when ready to perform the flaring work.
   e. Clamp the flare block on the end of the pipe. The end of the pipe must extend beyond the flare form.
   f. Place the flaring tool onto the form.
   g. Turn the handle of the flaring tool clockwise until the pipe is fully flared. Flare the pipe in accordance with the dimensions in Table 7.
   h. Remove the flaring tool and flare block, then inspect the end of the  pipe for cracks and even flaring. Table 7 — Flare Nut Spacing **Pipe Gauge In (mm)| ****Tightening Torque| Flare Dimension (A) (Unit: In/mm)
   ---|---|---
   Min| Max**
   Ø 1/4” (6.35)| 18-20 N.m| 0.33/8.4| 0.34/8.7
   Ø 3/8” (9.52)| 32-39 N.m| 0.52/13.2| 0.53/13.5
   Ø 1/2” (12.7)| 49-59 N.m| 0.64/16.2| 0.65/16.5
   Ø 5/8” (15.9)| 57-71 N.m| 0.76/19.2| 0.78/19.7
   Ø 7/8” (22)| 85-110 N.m| 1.04/26.4| 1.06/26.9

6. Connect the Pipes
   Connect the copper pipes to the outdoor unit first, then connect the pipes to the indoor unit. Connect the low-pressure pipe first, then connect the high pressure pipe.

7.  When connecting the flare nuts, apply a thin coat of refrigeration oil to the flared ends of the pipes.

8. Align the center of the two pipes that you will connect.

9. Tighten the flare nut as much as possible by hand.

10.  Using a wrench, grip the nut on the unit tubing.

11. While firmly gripping the nut, use a torque wrench to tighten the flare nut. See Table 7.
    NOTE: Use both a backup wrench and a torque wrench when connecting or disconnecting pipes to or from the unit.All tubing bends should be performed with a properly sized tubing bender to prevent kinking or damaging the tubing.

12. After connecting the copper pipes to the outdoor unit, wrap the power cable, signal cable and the piping together with binding tape.
    NOTE: While bundling these items together, DO NOT intertwine or cross the signal cable with any other wiring.

13. Thread this lineset through the wall to connect to the indoor unit.

14. Refer to the liquid line and gas line connection O.D. sizes in Table 6 based on the model being installed. Cut and deburr the tubing (review “Remove Burrs” on page 13) to prepare it for brazing. Setup the nitrogen apparatus and connect to the outside unit to flow nitrogen while brazing. Braze the tubing and any fittings to obtain a proper seal.

15. Adjust the nitrogen apparatus to pressurize the system. Pressure test the system to a maximum of 500 psig for at least 60 minutes.

16.  Insulate suction line completely, including the outdoor unit valves.
    CAUTION
    Wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite. Ensure the pipe is properly connected. Over tightening may damage the bell mouth and under tightening may lead to leakage.

17.  Brazing Adapter (Optional)

When flare to braze adapter is used, follow these steps:
a. Refer to the liquid line and gas line connection O.D. sizes in Table 6 on page 12 based on the model being installed. Cut and deburr the tubing (review “Remove Burrs” on page 13) to prepare it for brazing. Setup the nitrogen apparatus and connect to the outside unit to flow nitrogen while brazing. Braze the tubing and any fittings to obtain a proper seal.
b. Adjust the nitrogen apparatus to pressurize the system. Pressure test the system to a maximum of 500 psig for at leas60 minutes.
c. Insulate suction line completely, including the outdoor unit valves.

Step 7 – Evacuate Coil and Tubing System
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or improper operation. Never use the system compressor as a vacuum pump.
Refrigerant tubes and the indoor coil should be evacuated using the recommended 500 microns deep vacuum method. The alternate triple evacuation method may be used if the procedure outlined below is followed.
NOTE: Always break a vacuum with dry nitrogen. Using Vacuum Pump

1. Completely tighten flare nuts A, B, C, D, connect the manifold gage charge hose to a charge port of the low side service valve (see Fig. 39).
2.  Connect the charge hose to vacuum pump.
3.  Fully open the low side of manifold gage (see Fig. 40).
4.  Start the vacuum pump.
5.  Evacuate using either the deep vacuum or triple evacuation method.
6. After evacuation is complete, fully close the low side of manifold gage and stop the vacuum pump operation.
7. The factory charge contained in the outdoor unit is good for up to 25ft. (8 m) of line length. For refrigerant lines longer than 25 ft. (8 m), add refrigerant, up to the allowable length.
8. Disconnect the charge hose from the charge connection of the low side service valve.
9. Fully open service valves B and A.
10.  Securely tighten the service valve caps.

Evacuation
Evacuation of the system removes air or nitrogen (non-condensables) as well as moisture. A proper vacuum will assure a tight, dry system before charging with refrigerant. The two methods used to evacuate a system are the deep vacuum method and the triple vacuum method.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gauge capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and moisture.
NOTE: DO NOT add a filter line drier. Triple Evacuation Method
The triple evacuation method should be used when vacuum pump is not capable of pumping down to 500 microns and system does not contain any liquid water. Refer to Fig. 42 and proceed as follows:

1. Attach refrigeration gauges and evacuate system down to 28 in. of mercury and allow pump to continue operating for an additional 15 minutes.
2.  Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and flow nitrogen until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hour. During this time, dry nitrogen can diffuse throughout the system absorbing moisture.
5.  Repeat this procedure as indicated in Fig. 42. The system should now be free of any contaminants and water vapor.

Final Tubing Check
Check to be certain factory tubing on both the indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close attention to the feeder tubes, making sure wire ties on feeder tubes are secure and tight.
Step 8 – Mount Electric Heater (Optional)
Heater Kits
This unit is not equipped with an electric heater package. A factory-approved, field-installed, ETL listed heater package is available from your equipment supplier. Factory-authorized, field-installed electric heater packages are available in sizes 5kW through 25kW. Electric heaters that are not factory approved may cause damage which would not be covered under the equipment warranty. Review the product data literature for all available accessory kits.
Table 8 — Accessories

| 1
Screw|

| **** 7
Electric Auxiliary Heating Wiring Diagram| | 1
Circuit Breaker Label| | 1

NOTE: Installation must be performed by an authorized dealer or specialist. Use recommended PPE when installing the unit.
Specification of electric auxiliary heat modules: 5kW, 8kW, 10kW, 15kW, 20kW, 25kW.
Table 9 — Auxiliary Heater Compatibility

MODEL (Btu/h)| 5kW| 8kW| 10kW| 15kW| 20kW| 25kW
---|---|---|---|---|---|---
18K| Y| Y| Y| –| –| –
24K| Y| Y| Y| Y| –| –
30K| Y| Y| Y| Y| –| –
36K| Y| Y| Y| Y| Y| –
48K| –| Y| Y| Y| Y| –
60K| –| –| Y| Y| Y| Y

Table 10 — Power Requirements for Heaters

Heater Kit Size (KW)| **Model Number| MCA Circuit 1 208V/ 230V| MCA Circuit 2 208V/ 230V| MCA Circuit 3 208V/ 230V| MOPD Circuit 1 208V/ 230V| MOPD Circuit 2 208V/ 230V**
---|---|---|---|---|---|---
5| EHKMB0| 23.0/| | | 25.0/|
5KN| 27.0| 30.0
8| EHKMB0| 37.0/| | | 40.0/|
8KN| 42.0| 45.0
10| EHKMB1| 46.0/| | | 50.0/|
0KN| 53.0| 60.0
15| EHKMB1| 23.0/| 46.0/| | 25.0/| 50.0/
5KN| 27.0| 53.0| 30.0| 60.0
20| EHKMB2| 46.0/| 46.0/| | 50.0/| 50.0/
0KN| 53.0| 53.0| 60.0| 60.0
25| EHKMB2| 23.0/| 46.0/| 46.0/| 25.0/| 50.0/
5KN| 27.0| 53.0| 53.0| 30.0| 60.0

NOTE: The EHKMA series of heaters is NOT compatible with the 40MBAB air handler.
CAUTION
This electric auxiliary heat module is internally mounted in the air handler. DO NOT mount in the ductwork.
If the unit needs to be equipped with the electric auxiliary heat module, check the electric auxiliary heat module specification that is compatible with the unit to avoid unnecessary consequences caused by improper matching and refer to Product Data Manual.
INSTALLATION REQUIREMENTS
NOTE: Installation of Auxiliary Electric Heat Module should be completed before installing the discharge ductwork to insure proper alignment of the inside support brackets. Before installation, check the list of electric auxiliary heat modules and physical objects. After transportation, check whether the electric heat module is damaged. If any damage is detected, contact the after-sales personnel immediately.
NOTE: A separate power source is required for an Auxiliary Electric Heater. These units do NOT support a SINGLE POINT electrical connection when utilizing auxiliary heat.
ELECTRIC AUXILIARY HEAT MODULE INSTALLATION AND WIRING

1. Remove the upper cover and use professional tools to remove the upper cover knock-outs.

2. Remove the terminal block and power cord.

3. Loosen the screws.

4. Remove the electric auxiliary heating cover.

5. Install the electric auxiliary heating component into the chassis shell along the front of the unit.
   NOTE: Insert the front end into the shell assembly hole.

6. Tighten the screws.

7. Wiring according to the wiring template.

8.  Install the upper cover.

9. Install the waterproof case.

After the electric heating wiring is connected and before powering on:

• check all wiring and ensure a reliable connection of the wire body
• ensure the electric heating screw is tightened
•  ensure the size selection of the power wire meets the power supply requirements.

NOTE: An electric auxiliary heating wiring diagram is supplied with the accessories. For maintenance convenience, paste the wiring diagram in the inside cover after the installation of electric auxiliary heating modules is complete.
NOTE: After installing the electric auxiliary heat module, adhere the air switch label near the upper cover air switch.
Table 11 — Specifications

**Specifications| No. of Circuit Breakers| ****No. of Relays| No. of Power Cord Groups| No. of Power Cord Grounding Screws
---|---|---|---|---
5kW| 1| 1| 2| 2
8kW| 1| 2| 2| 2
10kW| 1| 2| 2| 2
15kW| 2| 3| 2| 2
20kW| 2| 4| 3| 3
25kW**| 3| 5| 4| 4

Fig. 48 —Indoor Unit Wiring Diagram

NOTE: The electric auxiliary heat wiring diagram is supplied with the accessories. Paste the wiring diagram in the designated  position after installing the heat modules.

INDOOR UNIT WIRING

Use the following steps to wire the indoor unit.
NOTE: Wiring in this section is for the base unit ONLY. Auxiliary Electric Heat wiring is covered in “INDOOR UNIT WIRING” on page 18.

1. Prepare the cable for connection.
   a. Using wire strippers, strip the insulation from both ends of the signal cable to reveal about 1/2 in (12mm) of wire.
   b. Strip the insulation from both ends of the wires.
   c. Use a wire crimper to crimp the fork terminals to the ends of the wires.

2.  Open the indoor unit’s front panel. Use a screwdriver to remove the cover of the electric control box on the indoor unit.

3. Thread the power cable and the signal cable through the wire outlet.

4.  Connect the fork terminals to the terminals. Match the wire colors/ labels with the labels on the terminal block.

5.  Firmly screw the fork terminals of each wire to its corresponding terminal. Refer to the serial number and wiring diagram located on the cover of the electric control box. CAUTION
   While connecting the wires, strictly follow the wiring diagram. The refrigerant circuit can become very hot.
   Keep the interconnection cable away from the copper tube.

6. Clamp down the cable with the cable clamp. The cable must not be loose or put strain on the fork terminals.

7. Reattach the electric box cover.
   The main power is supplied to the outdoor unit. When disconnecting the power of the outdoor unit, the indoor unit would lose power. A disconnect switch is not required on the indoor unit side on the wiring between the outdoor and indoor unit. A 3 pole disconnect (purchased separately) may be used for extra protection between the indoor and outdoor unit.

The Auxiliary Heater must have a separate branch electric circuit with a field-supplied disconnect switch located within sight from, and readily accessible from, the unit.

WIRING REQUIREMENTS

Size all wires per the NEC (National Electrical Code) or CEC (Canadian Electrical Code) and local codes. Use the electrical data from the outdoor unit (MCA – minimum circuit amps and MOCP – maximum over current protection),
to correctly size the wires and the disconnect fuse or breakers respectively. SIZE 18 – 36K (NON LIGHT-COMMERCIAL MODELS) RECOMMENDED CONNECTION METHOD FOR POWER AND COMMUNICATION WIRING
Power and Communication Wiring: The main power is supplied to the outdoor unit. The field supplied 14/3 power/communication wiring, from the outdoor unit to the indoor unit, consists of four (4) wires and provides the power for the indoor unit. Two wires are high voltage AC power, one is communication wiring and the other is a ground wire.
To minimize communication interference: If installed in a high Electromagnetic field (EMF) area and communication issues arise, a 14/2 stranded shielded cable can be used to replace L2 and (S) between the outdoor and indoor units – landing the shield onto the ground in the outdoor unit only.
Table 12 — Wiring Sizes 12K-36K

required)

SIZES 36-60 (LIGHT-COMMERCIAL MODELS) RECOMMENDED CONNECTION METHOD FOR POWER AND COMMUNICATION WIRING
Power and Communication Wiring: The main power is supplied to the outdoor unit. The field supplied power wiring from the outdoor unit to the indoor unit consists of three (3) wires and provides the power for the indoor unit. Two wires are high voltage AC power and one is a ground wire. To minimize voltage drop, the factory recommended wire size is 14/ 2 power stranded with a ground.
Communication Wiring: A separate 2-wire cable (stranded, shielded, copper conductor), with a 600 volt rating and double insulated copper wire, must be used as the communication wire from the outdoor unit to the indoor unit. Use a separate shielded 16AWG stranded control wire.
Table 13 — Wiring Sizes 36K-60K

CAUTION
EQUIPMENT DAMAGE HAZARD
Be sure to comply with local codes while running wire from the indoor unit to the outdoor unit.
Every wire must be connected firmly. Loose wiring may cause the terminal to overheat or result in a unit malfunction. A fire hazard may also exist. Ensure all wiring is tightly connected.
No wire should touch the refrigerant tubing, compressor or any moving parts.
Disconnecting means must be provided and located within sight and readily accessible from the system. Route the connecting cable with conduit through the hole in the conduit panel.
NOTE: The main power is supplied to the outdoor unit. When disconnecting the power of the outdoor unit, the indoor unit would lose power. A disconnect switch is not required on the Indoor unit side on the wiring between the Outdoor and Indoor unit. A 3 pole disconnect may be used for extra protection between the indoor and outdoor unit (refer to local codes). A separate power source is required for an auxiliary electric heater.

ELECTRICAL DATA

MODEL NO.

| | INDOOR FAN| MAX FUSE CB AMP
---|---|---|---
V-PH-HZ| FLA| HP| W|
40MBABQ18XB3| 208-230/1/60| 2| 0.33| 68| Refer to outdoor unit installation instructions – Indoor unit powered by the outdoor unit
40MBABQ24XB3| 3| 0.33| 68
40MBABQ30XB3| 3.5| 0.50| 168
40MBABQ36XB3| 3.5| 0.50| 168
40MBABQ48XA3| 3.5| 0.75| 235
40MBABQ60XA3| 7.0| 1| 286.5

CONNECTION DIAGRAMS AND CONTROL METHODS

The air handler fan coil unit can be controlled mainly through the following methods.

• SCENARIO #1 Wired controller (Included, optional accessory) – KSACN1001AAA: Non-polarity controller used to operate all functions. The wired controller is equipped with an infrared receiver and can be used in conjunction with the wireless controller.
  For this scenario to be enabled SW1-1 must be set to the OFF positions (Default).

• SCENARIO #1 Wireless controller (Included):
  Hand-held wireless remote provides the same functionality as the wired controller and can be used in conjunction with the wired controller. Refer to the Owner’s Manual for the remote’s operational instructions. For this scenario to be enabled SW1-1 must be set to the OFF position (Default).

•  SCENARIO #2 Third party heat pump thermostat (Not Included): Allows the control of the air handler via the built-in 24V interface. To enable this scenario, SW1-1 must be set to the ON position.

NOTE: When DIP SWITCH SW1 is set to default, the system automatically detect a the wiring method according to scenarios 1 and 2. In case of unexpected failure, DIP SWITCH SW1 can be set according to each wiring method.
Table 15 — Dip Switch Definitions

Cooling & Heating
SW1-4*| OFF is for 2 and ON is for 1| Control Function| Scenario 1| [Default] Auto Detect or Scenario 2
SW2-1| 2| Compressor Running Compensation (Demand working with heat pump+ Electric heat)| Compressor slower speed| [Default] Faster Compressor
SW2-1| **** 1| Temperature differential to activate first stage auxiliary heat (the GAP of T1 and Ts) Wire controller demand with heat pump + Electric heat working together| **** 2°F| [Default] 4°F
SW2-2| 1| Electric heat on delay| YES| [Default] NO
SW2-3| 1| Electric auxiliary heating delay to start time| 30 minutes| [Default] 15 minutes
SW2-4| 1| Compressor/Auxiliary heat outdoor ambient lockout| The compressor will not operate if the outdoor temperature is lower than the temperature represented by S3| [Default] The heater will not operate if the outdoor temperature is greater than the temperature represented by S3
Rotary Switch S3| 1| 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 increased up to 46°F|
SW3-1| 2| Maximum continuous runtime allowed before 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| 30 minutes| [Default] 90 minutes
SW3-2| 2| Cooling and heating Y/Y2 compressor speed adjustment.| Compressor slower speed| [Default] Faster Compressor
SW3-3| 2| Compressor Running (demand working with heat pump+ Electric heat)| Compressor slower speed| [Default] Faster Compressor
SW3-3| **** 1| Temperature differential to activate second stage auxiliary heating (the GAP of T1 and Ts) Wire controller demand with heat pump+ Electric heat working together| **** 4°F| ** [Default] 6°F
SW3-4| 2| Fan speed of the COOLING mode when 24V thermostat is applied for.| Turbo| Off
** SW4| 1,2| 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. See table 11 for the corresponding CFM adjustment|
S4-1| 2| ** Default ON**| [Default] For single stage supplemental heat, W1 and W2 are connected| For dual stage supplemental heat, W1 and W2 are controlled independently.
S4-2| 2| DH function selection| [Default] Dehumidification control not available| Dehumidification feature is enabled through thermostat

*NOTE: When DIP SWITCH SW1 is set to default, the system automatically detects the wiring method according to the three control scenarios. In the event of an unexpected failure, DIP SWITCH SW1 can be set according to Table 15.

SW1
This dip switch group mainly controls and selects the type of unit. It is suggested that adjustments are only made under the guidance of the authorized technician.

• SW1-1: Control function, (ON: 24V Thermostat; OFF Auto Detect or Wired controller, default)
• SW1-2: Use this dip switch to determine whether to stop the fan when cold air is released; OFF stops the fan, ON does not stop the fan, the default is OFF
•  SW1-3: Select Cooling Only and heat pump functions; ON: cooling only; OFF: heating and cooling, default
• SW1-4: Control Function, (ON: Control scenario 1; OFF: Auto Detect or Scenario 2, default)

NOTE: When DIP SWITCH SW1 is set to default, the system automatically detects the wiring method according to the three control scenarios. In the event of an unexpected failure, DIP SWITCH SW1 can be set according to Table 15 on page 22.
SW2
This dip switch group controls compressor compensation or opening form of the electric auxiliary heat depending on control scenario being used.

• SW2-1 (Control Scenario 2): This dip switch can control compressor compensation speed when heat pump and electric hear are ON simultaneously. OFF: Faster compressor speed, default; ON: Slower compressor speed used for energy conservation

• SW2-1 (Control Scenario 1): This dip switch can control the temperature difference when the electric heating is turned on. OFF: 4°F(2°C), default; ON: 2°F(1°C), 3-level temperature setting, consistent with user thermostat setting.
  NOTE: When E/AUX controls electric heating, there is no temperature difference, and it starts directly.

• SW2-2, SW2-3: This two-digit dialing code can control the delayed start of electrically-assisted heat. When the temperature difference is too great, the delayed start and the delayed start time can be selected.

opening time

• SW2-4: This dial code controls the permissible opening temperature of electric heating or compressor, OFF allows the opening temperature of electric heating (using the set temperature of S3 Rotary Switch as the upper limit temperature of electric heating), and ON the allowable opening temperature of the compressor (using Rotary Dial S3 as the upper limit temperature of electric heating). The lower limit temperature at which the compressor can allow operation.)

S3 Rotary Switch
Ambient temperature controlled by electric heating or compressor, 0 means no temperature protection is turned on, Rotary Dial position 1 through F maps to -4°F (-20°C) through 46°F (8°C). Each rotary dial point is a 4°F (2°C) change from the previous point.
Example: Set dial point 1 = -20C. Dial point 2 = -18C. ….Dial point F = 8C, and each scale represents 4°F (2°C). SW3
This dip switch group mainly controls compressor compensation or adjustments to temperature dead-bands depending on control scenario being used.

• SW3-1: This dialing code can set the continuous operation time for increasing the set temperature by 1°F-5°F(0.5°C~3°C) before reaching the temperature. The default is OFF = 90 minutes; ON = 30 minutes.
• SW3-2: This dialing code can set Y/Y2 Y/Y2 compressor speed adjustment. OFF: Faster compressor speed, default; ON: Slower compressor speed used for energy conservation
• SW3-3 (Control Scenario 2): This dip switch can control compressor compensation speed when heat pump and electric hear are ON simultaneously. OFF: Faster compressor speed, default; ON: Slower compressor speed used for energy conservation
• SW3-3 (Control Scenario 1): This dialing code can set W2 signal setting temperature adjustment deviation, ON: 4°F (2°C); OFF: 6°F (3°C).
• SW3-4: This dip switch enables TURBO fan speed for cooling (ON for TURBO). This allows for TURBO speed in COOLING mode and AUTO fan logic. OFF: High speed, default, ON: TURBO speed

SW4 Air Flow Adjustment
This dip switch group works as a combination and enables nominal CFM adjustments. Only switches 1-3 are enabled. Switch 4 is reserved for future use. The available settings are: 000/001/010/011, and the air flow is adjusted according to Table 18:
S4 Dip Switch Settings
This dip switch group is for configuring the staging of supplemental heat and for dehumidification fan control.

• S4-1: Use this dip switch when 2 stages of supplemental heat, W1 and W2, are available; OFF allows for independent control of W1 and W2 via the Thermostat (dual stage), ON is used for single stage
  supplemental heat, W1 and W2 are internally jumped together. The default is ON

• S4-2: Use this dip switch to enable dehumidification fan operation. OFF removes the internal jumper from R to DH, meaning DH will be controlled via the thermostat. When the system is configured for dehumidification and there is a demand present, the 24V output from the thermostat drops to 0V, the refrigeration system starts the dehumidification operation, and the fan air volume drops to low fan speed.

ON creates an internal jump between R and DH, meaning no external dehumidification signal is present, DH will always receive a 24V signal and the fan will operate as normal. The default is ON.
NOTE: S4-2 operates on reverse logic. DH is energized when there is no external dehumidification control. Table 16 — Electric Heater Nominal Air Flow Settings
Electric Heater Nominal Air Flow Settings (Sheet 1 of 3)

Capacity| External Static Pressure Range| Fan Speed| Electric Heater Kit| 24V Thermostat| Wired Controller| Air Volume CFM
---|---|---|---|---|---|---
DIP Switch| 24V Terminal Engaged| DIP Switc| Mode
40MBABQ18XA3| 0 – 0.80 in. w.g.| Cooling Turbo| —| SW3-4=ON| Y2/Y| —| Cool| 618
Cooling High| —| SW3-4=OFF| Y2/Y| —| Cool| 576
Cooling Medium| —| —| Y1| —| Cool| 529
Cooling Low| —| —| —| —| Cool| 488
Heat Pump Turbo| —| —| —| —| Heat| 565
Heat Pump High| —| —| B+Y2/Y, W| —| Heat| 541
Heat Pump| —| —| Y1| —| Heat| 435
Medium
Heat Pump Low| —| —| —| —| Heat| 400
Electric heater kit 0 (Default)| 10KW| SW4-1=OFF
SW4-2=OFF SW4-3=OFF| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF SW4-3=OFF| Heat + AUX, AUX| 653

Electric heater kit 1

| 10KW,

8KW

| SW4-1=OFF SW4-2=OFF
SW4-3=ON| W1, W2, AUX| SW4-1=OFF SW4-2=OFF
SW4-3=ON| Heat + AUX, AUX| 624
| | SW4-1=OFF| | SW4-1=OFF| |
Electric heater kit 2| 8KW| SW4-2=ON| W1, W2, AUX| SW4-2=ON| Heat + AUX, AUX| 594
| | SW4-3=OFF| | SW4-3=OFF| |
| | SW4-1=OFF| | SW4-1=OFF| |
Electric heater kit 3| 5KW| SW4-2=ON| W1, W2, AUX| SW4-2=ON| Heat + AUX, AUX| 565
| | SW4-3=ON| | SW4-3=ON| |
40MBABQ24XA3| 0 – 0.80 in. w.g.| Cooling Turbo| —| SW3-4=ON| Y2/Y| —| Cool| 824
Cooling High| —| SW3-4=OFF| Y2/Y| —| Cool| 759
Cooling Medium| —| —| Y1| —| Cool| 694
Cooling Low| —| —| —| —| Cool| 629
Heat Pump Turbo| —| —| —| —| Heat| 788
Heat Pump High| —| —| B+Y2/Y, W| —| Heat| 753
Heat Pump| —| —| Y1| —| Heat| 641
Medium
Heat Pump Low| —| —| —| —| Heat| 524
Auxiliary Heater Default 0| 15KW| SW4-1=OFF
SW4-2=OFF SW4-3=OFF| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF SW4-3=OFF| Heat + AUX, AUX| 871

Auxiliary Heater 1

| 15KW,

10KW

| SW4-1=OFF SW4-2=OFF
SW4-3=ON| W1, W2, AUX| SW4-1=OFF SW4-2=OFF
SW4-3=ON| Heat + AUX, AUX| 841

Auxiliary Heater 2

| 10KW,
8KW| SW4-1=OFF SW4-2=ON SW4-3=OFF| W1, W2, AUX| SW4-1=OFF SW4-2=ON SW4-3=OFF| Heat + AUX, AUX| 818
Auxiliary Heater 3| 5KW| SW4-2=ON
SW4-3=ON
SW4-1=OFF| W1, W2, AUX| SW4-1=OFF
SW4-2=ON
SW4-3=ON| Heat + AUX, AUX| 788

Electric Heater Nominal Air Flow Settings (Sheet 2 of 3)

C apacity| External Static Pressure Range| Fan Speed| Electric
Heater Kit| 24V Thermostat| Wired Controller| Air Volume CFM
---|---|---|---|---|---|---
DIP Switch| 24V Terminal
Engaged| DIP Switch| Mode
40MBA8030XA3| 0 – 0.80 in. w.g.| Cooling Turbo| —| SW3-4=ON| Y2/Y| | Cool| 988
Cooling High| —| SW3-4=OFF| Y2/Y| | Cool| 894
Cooling Medium| —| —| Y1| | Cool| 806
Cooling Low| —| —| —| | Cool| 712
Heat Pump Turbo| —| —| —| | Heat| 918
Heat Pump High| —| —| B+Y2/Y, W| —| Heat| 876
Heat Pump
Medium| —| —| Y1| —| Heat| 665
Heat Pump Low| —| —| —| —| Heat| 453
Auxiliary Heater
Default 0| 15KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=OFF| Heat + AUX, AUX| 1088
Auxiliary Heater 1| 15KW,
10KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| Heat + AUX, AUX| 1029
Auxiliary Heater 2| 10KW,
8Kw| SW4-1=OFF
SW4-2=0N
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=OFF| Heat + AUX, AUX| 976
Auxiliary Heater 3| 5KW| SW4-1=OFF
SW4-2=0N
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=0N| Heat + AUX, AUX| 918
40MBAI3036XA3| 0 – 0.80 in. w.g.| Cooling Turbo| —| SW3-4=ON| Y27Y| —| Cool| 1188
Cooling High| —| SW3-4=OFF| Y2/Y| —| Cool| 1082
Cooling Medium| —| | Y1| | Cool| 971
Cooling Low| —| | —| | Cool| 865
Heat Pump Turbo| —| | —| | Heat| 1112
Heat Pump High| —| | 6+Y2/Y, W| | Heat| 1059
Heat Pump
Medium| —| —| Y1| —| Heat| 794
Heat Pump Low| —| —| —| —| Heat| 582
Auxiliary Heater
Default 0| 20KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=OFF| Heat + AUX, AUX| 1306
Auxiliary Heater 1| 15KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| Heat + AUX, AUX| 1241
Auxiliary Heater 2| 10KW,
8Kw| SW4-1=OFF
SW4-2=ON
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=OFF| Heat + AUX, AUX| 1176
Auxiliary Heater 3| 8KW,
5Kw| SW4-1=OFF
SW4-2=0N
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=0N| Heat + AUX, AUX| 1112

Electric Heater Nominal Air Flow Settings (Sheet 3 of 3)

Capacity| External Static
Pressure Range| Fan Speed| Electric Heater Kit| 24V Thermostat| Wired Controller| Air Volume CFM
---|---|---|---|---|---|---
DIP Switch| 24V Terminal
Engaged| DIP Switch| Mode
40MBABO48XA3| 0 – 0.80 in. w.g.| Cooling Turbo| —| SW3-4=ON| Y2/Y| —| Cool| 1471
Cooling High| —| SW3-4=OFF| Y2/Y| —| Cool| 1282
Cooling Medium| —| —| Y1| —| Cool| 1094
Cooling Low| —| —| —| —| Cool| 906
Heat Pump Turbo| —| —| —| —| Heat| 1471
Heat Pump High| —| —| B+Y2N, W| —| Heat| 1306
Heat Pump
Medium| —| —| `11| —| Heat| 1141
Heat Pump Low| —| —| —| —| Heat| 976
Auxiliary Heater
Default 0| 20KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=OFF| Heat + AUX, AUX| 1741
Auxiliary Heater 1| 15KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| Heat + AUX, AUX| 1653
Auxiliary Heater 2| 10KW,
8KW| SW4-1=OFF
SW4-2=0N
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=OFF| Heat + AUX, AUX| 1559
Auxiliary Heater 3| 8KW| SW4-1=OFF
SW4-2=0N
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=0N| Heat + AUX, AUX| 1471
40MBABO6OXA3| 0 – 0.80 in. w.g.| Cooling Turbo| —| SW3-4=ON| Y2/Y| —| Cool| 1806
Cooling High| —| SW3-4=OFF| Y2/Y| —| Cool| 1582
Cooling Medium| —| —| Y1| | Cool| 1359
Cooling Low| —| —| —| | Cool| 1135
Heat Pump Turbo| —| | | | Heat| 1659
Heat Pump High| —| | B+Y2/Y, W| –| Heat| 1582
Heat Pump
Medium| —| —| Y1| —| Heat| 1247
Heat Pump Low| —| —| —| —| Heat| 976
Auxiliary Heater
Default 0| 25KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=OFF| Heat + AUX, AUX| 2171
Auxiliary Heater 1| 20
KW’ 15KW| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=OFF
SW4-3=0N| Heat + AUX, AUX| 2029
Auxiliary Heater 2| 15KW,
10KW| SW4-1=OFF
SW4-2=0N
SW4-3=0FF| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=OFF| Heat + AUX, AUX| 1894
Auxiliary Heater 3| 10KW| SW4-1=OFF
SW4-2=0N
SW4-3=0N| W1, W2, AUX| SW4-1=OFF
SW4-2=0N
SW4-3=0N| Heat + AUX. AUX| 1753

MATCHING WITH MULTI ZONE OUTDOOR UNIT

When matching with multi zone outdoor unit, the indoor unit cannot be started due to the mode conflict listed in Table
Table 17 — Matching with Multi Zone Unit

Cooling
Dehumidification
Heating| Fan/Cooling/Dehumidification| Other IDU Zones
Electric Heat
Emergency Heat
NOTE:
•  When HEATING reaches the temperature and shuts down with other IDU zones heating normally, the AHU fan stops running, and the Fan-ON mode is invalid.
•  The heat pump starts synchronously when the Emergency heat or Electric heat is started.
•  When the two AHU units are connected by multi zone outdoor unit, the above rules are applicable while one of the AHU units regarded as other IDU zones.

AUXILIARY CONTACTS

Main Board WORK terminal port CN23 – DRY CONTACT – OUTPUT

• The WORK port is linked to the unit’s indoor blower
• When the indoor blower is off, the contact is open
• When the indoor blower is running, the contact is closed
• There is no voltage from CN23, power is provided from the external control system and not from the unit
• The contacts are rated at 250VAC and 10 AMP maximum
•  If an active 24V signal output is required, G and C ports (thermostat connections) may be used instead

ALARM terminal port CN33 – NORMALLY OPEN DRY CONTACT (OUTPUT)

• Allows the terminal port to connect to an external ALARM interface or annunciator
• There is no voltage from CN33, power is provided from the ALARM system and not from the unit
•  The contacts are rated at 250VAC and 10 AMP maximum
• When the unit experiences a problem, the contact closes, and the ALARM is triggered. When the unit experiences a problem, the relay closes, and the ALARM is triggered.

WATER LEVEL switch terminal port CN5 – SWITCH INPUT

• To enable this switch, jumper J1 must be removed
• A field supplied float switch can be directly connected to CN5
• CLOSED contacts = normal
• OPEN contacts = overflow
•  When an overflow condition occurs, a signal is sent to the system to turn it off: Alarm EE is displayed.

UV LED terminal port CN43 – OUTPUT 24VAC:

• The UV LED port is linked to the unit’s fan
• When the fan is running, the relay is closed and there is an output of 24VAC through the contacts that can be used to power a compatible UV LED LIGHT

24V Interface Board Remote control (ON-OFF) terminal port CN2 and jumper JR1 – OUTPUT 12VDC:

• Remove the jumper JR1 to enable the ON-OFF function
• When the remote switch is off (OPEN); the unit is OFF
•  When remote switch is on (CLOSE); the unit is ON
• When the remote switch is close/open, the unit responds to the demand within 2 seconds
• When the remote switch is on, you can use the included remote controller or wired controller to operate the unit as normal. When the remote switch off, the unit would not respond the command from the remote controller or wired controller and a CP code would be displayed on the board.
• The voltage of the port is 12V DC, design Max. current is 5mA.

Control Logic
Table 18 — Indoor Unit Connector

LED Display
The control displays active faults switches on the LED display. If the control displays the fault switch and the LED flashes quickly, the unit has malfunctioned. Refer to the detailed fault switches.

TEST RUN

BEFORE THE TEST RUN
A test run must be performed after the entire system has been completely installed. Confirm the following points before performing the test.
a. Indoor and outdoor units are properly installed.
b. Piping and wiring are properly connected.
c. There are no obstacles near the unit’s inlet and outlet that might cause poor performance or product malfunction.
d. Refrigeration system does not leak.
e. Drainage system is unimpeded and draining to a safe location.
f. Heating insulation is properly installed.
g. Grounding wires are properly connected.
h. Length of the piping and additional refrigerant recorded.
i. Power voltage is the correct voltage for the system.
CAUTION
Failure to perform the test run may result in unit damage, property damage, or personal injury.
Test Run Instructions

1. Open both the liquid and gas stop valves.

2.  Turn on the main power switch and allow the unit to warm up.

3. Set the air conditioner to the COOL mode.

4.  For the indoor unit:
   a. Double check to see if the room temperature is being registered correctly.
   b. Ensure the manual buttons on the indoor unit work properly.
   c. Ensure the drainage system is unimpeded and draining smoothly.
   d. Ensure there is no vibration or abnormal noise during operation.

5. For the outdoor unit:
   a. Check to see if the refrigeration system is leaking.
   b. Ensure there is no vibration or abnormal noise during peration.
   c. Ensure the wind, noise, and water generated by the unit do not disturb neighbors or pose a safety hazard.

6. Drainage Test
   a. Ensure the drainpipe flows smoothly. New buildings should perform this test before finishing the ceiling.
   b. Remove the test cover. Add 2,000 ml of water to the tank through the attached tube.
   c. Turn on the main power switch and run the air conditioner in the COOL mode.
   d. Check to see that the water is discharged. It may take up to one minute before the unit begins to drain depending on the drainpipe.
   e. Ensure there are no leaks in any of the piping.
   f. Stop the air conditioner. Turn off the main power switch and reinstall the test cover.
   NOTE: If the unit malfunctions or does not operate according to your expectations, please refer to the Troubleshooting section of the owner’s manual before calling customer service.

SYSTEM CHECKS

1. Conceal the tubing where possible.
2. Ensure the drain tube slopes downward along its entire length.
3.  Ensure all tubing and connections are properly insulated.
4. Fasten the tubes to the outside wall, when possible.
5. Seal the hole through which the cables and tubing pass.

INDOOR UNIT

1. Do all the remote controller buttons function properly?
2.  Do the display panel lights work properly?
3.  Does the drain work?

Explain the following items to customer (with the aid of the owner’s manual):

1. How to turn air conditioner ON and OFF;
2.  How to select COOLING, HEATING and other the operating modes;
3. How to set a desired temperature;
4.  How to set the timer to automatically start and stop air conditioner operation;
5.  How to control all the other features of the remote controller and display panel.
6.  How to remove and clean the air filter.
7. Unit care and maintenance.

Present the owner’s manual and installation instructions to the customer.

START-UP PROCEDURES
Refer to outdoor unit’s installation instructions for system start-up instructions.
CAUTION
UNIT COMPONENT HAZARD
Failure to follow this caution may result in product damage. Never operate the unit without a filter. Damage to the blower motor or coil may occur. For those applications where access to an internal filter is impractical, a field- supplied filter must be installed in the return duct system.

CARE AND MAINTENANCE

To continue high performance and minimize possible equipment failure, it is essential that periodic maintenance be performed on this equipment. Consult your local dealer as to the proper frequency of maintenance contract.
The ability to properly perform maintenance on this equipment requires certain mechanical skills and tools. If you do not possess these, contact your dealer for maintenance. The only consumer service recommended or required is filter replacement or cleaning on a monthly basis.

TROUBLESHOOTING

For ease of service, the systems are equipped with diagnostic code display LEDs on some outdoor units. The outdoor diagnostic display consists of two LEDs (red and green) on the outdoor unit board and is limited to a few errors. The indoor diagnostic display is a digital readout on the display panel. If possible, always check the diagnostic codes displayed on the indoor unit first before consulting a service technician. The diagnostic codes, displayed in the indoor and outdoor units, are listed in Table 19.
Table 19 — Indoor Unit Diagnostic Guides

protection
PC04| Inverter compressor drive error
PC03| Low pressure protection
PC0L| Low temperature protection of outdoor unit
—-| Indoor units mode conflict

NOTE: If the LED display shows DF (Defrost) or FC (Forced Cooling), these are operational codes and, not fault or protection.
For additional diagnostic information, refer to the indoor unit service manual.
ELECTRIC AUXILIARY HEATING WIRING DIAGRAMS
Table 20 — Specifications

Specifications| No. of Circuit Breakers| No. of Relays| **No. of Power Cord Groups*| No. of Power Cord Grounding Screws**
---|---|---|---|---
5kW| 1| 1| 2| 2
8kW| 1| 2| 2| 2
10kW| 1| 2| 2| 2
15kW| 2| 3| 2| 2
20kW| 2| 4| 3| 3
25kW| 3| 5| 4| 4

*Power cord “A” for main unit on all sizes

© 2023 Carrier. All rights reserved.
Edition Date: 01/23
Catalog No: 40MBAB-03SI
Replaces: 40MBAB-02SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Documents / Resources

| Carrier 40MBAB Air Handler Unit Ductless System [pdf] Installation Guide
40MBAB, 40MBAB Air Handler Unit Ductless System, Air Handler Unit Ductless System, Handler Unit Ductless System, Unit Ductless System, Ductless System, System
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