Carrier 40MBABQ36XA3 Air Handler Heat Pump Ductless System User Manual

: June 15, 2024
: Carrier

Table of Contents

Carrier 40MBABQ36XA3 Air Handler Heat Pump Ductless System
Product Information
Product Usage Instructions
SAFETY CONSIDERATIONS
INTRODUCTION
TROUBLESHOOTING
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Carrier 40MBABQ36XA3 Air Handler Heat Pump Ductless System

Carrier-40MBABQ36XA3-Air-Handler-Heat-Pump-Ductless-
System

Product Information

The 40MBAB Air Handler Unit is a ductless system available in sizes 18 to 60. It is designed for air conditioning purposes and is suitable for both light commercial and non-light commercial applications. The unit is equipped with an indoor fan coil unit type A, which functions as an air handler.

This service manual provides detailed information for servicing, repairing, and maintaining the indoor units. It includes an appendix on page 36 that contains troubleshooting data. The manual also provides a table of contents on page 1 for easy navigation.

Model Number Nomenclature:

KBTUH	18	24	30	36	36
V-PH-HZ	208/230-1-60	208/230-1-60	208/230-1-60	208/230-1-60	208/230-1-60
208/230-1-60	208/230-1-60
ID MODEL NO.	40MBABQ18XB3	40MBABQ24XB3	40MBABQ30XB3	40MBABQ36XB3
40MBABQ36XA3	40MBABQ48XA3	40MBABQ60XA3

Specifications are subject to change without notice.

Note: The unit requires a main electrical disconnect switch to be in the OFF position before installation, modification, or servicing. Additionally, only trained and qualified installers and service mechanics should handle the unit.

Product Usage Instructions

Ensure the main electrical disconnect switch is in the OFF position before installing, modifying, or servicing the unit. If there are multiple disconnect switches, lock out and tag each switch with a suitable warning label.
Only trained and qualified installers and service mechanics should perform the installation, start-up, and servicing of the air conditioning equipment. Untrained personnel can perform basic maintenance tasks such as coil cleaning, but all other operations should be handled by trained service personnel.
When working on the equipment, always observe the precautions mentioned in the literature and on tags, stickers, and labels attached to the equipment.
Follow all safety codes and wear safety glasses and work gloves. Keep a quenching cloth and fire extinguisher nearby when brazing. Exercise caution when handling, rigging, and setting bulky equipment.
Read the manual thoroughly and follow all the warnings or cautions provided in the literature and attached to the unit. Consult local building codes and the National Electrical Code (NEC) for any special requirements.
Take note of the safety-alert symbol ( ) on the unit and in the instructions or manuals. Be alert to the potential for personal injury when encountering this symbol. Familiarize yourself with the signal words used: DANGER, WARNING, and CAUTION.
Never use air or gases containing oxygen for leak testing or operating refrigerant compressors, as this can lead to an explosion. Only use approved methods and materials for these purposes.

40MBAB Air Handler Unit Ductless System Sizes 18 to 60

SAFETY CONSIDERATIONS

These words are used with the safety-alert symbol. DANGER identifies the most serious of 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 SHOCK HAZARD Failure to follow this warning could result in personal injury or death. Before installing, modifying, or servicing the unit, the main electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.

Installing, starting up, and servicing air-conditioning equipment can be hazardous due to unit pressures, electrical components, and equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should install, start-up, and service this equipment.
Untrained personnel can perform basic maintenance functions such as coil cleaning. All other operations should be performed by trained service personnel only.
When working on the equipment, observe the precautions in the literature and on tags, stickers, and labels attached to the equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep a quenching cloth and fire extinguisher nearby when brazing. Use care in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all the warnings or cautions included in the literature and attached to the unit. Consult local building codes and the National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION.

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.
CAUTION
EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage or improper operation. Do not bury more than 36 in. (914 mm) of refrigerant pipe in the ground. If any section of pipe is buried, there must be a 6 in. (152 mm) vertical rise to the valve connections on the outdoor units. If more than the recommended length is buried, refrigerant may migrate to the cooler buried section during the extended periods of unit shutdown. This causes refrigerant slugging and could possibly damage the compressor at start-up.

INTRODUCTION

This service manual provides the necessary information to service, repair, and maintain the indoor units. This manual contains an “APPENDICES” on page 36 with data required to troubleshoot issues. Use the “TABLE OF CONTENTS” on page 1 to locate a desired topic.

Specifications subject to change without notice.

40MBAB: Service Manual

MODEL NUMBER NOMENCLATURE

Table 1 — Unit Sizes

KBTUH 18 24 30

V-PH-HZ

36

208/230-1-60

36

48

60

ID MODEL NO. 40MBABQ18XB3 40MBABQ24XB3 40MBABQ30XB3 40MBABQ36XB3 40MBABQ36XA3 40MBABQ48XA3 40MBABQ60XA3

INDOOR UNIT

40 MB

A

B

Q

24

X

A

3

40 = INDOOR UNIT

MB = MODEL
INDOOR FAN COIL UNIT TYPE A = AIR HANDLER
MAJOR SERIES

VOLTAGE 3 = 208/230-1-60
A = Light Commercial B = Non Light Commercial

UNIT TYPE Q = Heat Pump
NOMINAL CAPACITY 18 – 1 1/2 TON 24 – 2 TONS 30 – 2 1/2 TONS 36 – 3 TONS 48 – 4 TONS 60 – 5 TONS

MAXIMUM NUMBER OF FAN COIL UNITS CONNECTED TO THE OUTDOOR UNIT A = 1:1

21

22

V

10001

Week of Manufacture

Sequential Serial Number

Year of Manufacture

V = ALL MODELS

Use of the AHRI Certified TM Mark indicates a manufacturer’s participation in the program For verification of certification for individual products, go to www.ahridirectory.org.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 2

40MBAB: Service Manual
AUXILLIARY CONTACTS FOUND ON THE MAIN BOARD
Work Terminal Port CN23 – Normally Open Dry Contact (Output)
· The WORK terminal 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.
Fig. 1 — Auxiliary Contacts
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.
Fig. 2 — Auxiliary Contacts
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 3

40MBAB: Service Manual
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 appears.
Fig. 3 — Auxiliary Contacts
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 · May also be used to power a pilot relay with 24VAC coil to control other peripherals
Fig. 4 — Auxiliary Contacts
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 4

40MBAB: Service Manual
Auxiliary Contacts found on the 24V interface Board:
Remote control (ON-OFF) terminal port CN2 and jumper JR1 – INPUT: · 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 will not respond to the command from the remote controller or wired controller and a CP code is displayed on the
board.
Fig. 5 — Auxiliary Contacts
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 5

B CD BCD BCD BCD BCD

345 345 345 345
34 5

40MBAB: Service Manual
ROTARY AND DIP SWITCHES
Micro-Switch Setting:

FOR SETTING NETADDRESS

S1+S2

EF 0 1 2

ON

67 9A

8

12

CODE

0~F

NETADDRESS

0~15

F A C T O R YS E T T I N G

67 9A

EF 0 1 2

ON

8

12

0~F

16~31

EF 0 1 2

ON

67 9A

8

12

0~F

32~47

67 9A

EF 0 1 2

ON

8

12

0~F

48~63

Fig. 6 –Net Address Micro-switch S1 and dial-switch S2 are for address setting when the user wants to control the unit with a central controller.
Range: 00-63

Fig. 7 — Unit Configuration

24V THERMOSTATS SETTING

CODE FACTORY SETTI

EF 0 1 2
S3
8
0~F

67 9A

ON
SW1
12 34 ON~OFF

ON
SW2
12 34 ON~OFF

ON
SW3
12 34 ON~OFF

ON
SW4
12 34 ON~OFF

ON
S4
12
ON~OFF

Fig. 8 — Unit Configuration Factory Settings

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 6

40MBAB: Service Manual
CONNECTORS (CONT.)

Table 2 — Unit Configuration Settings

DIAL CODE

FEATURES

S3

Electric heating turns on outdoor T4 temperature

SW1-1 SW1-2 SW1-3 SW1-4 SW2-1 SW2-2 SW2-3
SW2-4
SW3-1
SW3-2
SW3-3 SW3-4 S4-1 S4-2

Whether 24V control selection Cold wind protection option Single cooling/heating and cooling options Set machine.single internal machine The first group controls the electric heating to turn on the temperature difference Whether the electric heating is delayed Electric auxiliary heating delay start time
Electric heating/compressor allow opening limit
Continuous running time when the 1.8°F (1°C) set temperature is not reached Cooling and heating Y2 signal setting temperature adjustment value A Hysteresis of the second group of electric heating Reserve Default ON Default ON

ON

OFF (DEFAULT)

0 (zero) means that the temperature protection is not turned on.

1 through F maps to -4°F through 46°F (-20°C through 8°C).

Each increment represents 3.6°F (2°C).

YES

NO

YES

Cooling

Heating and Cooling

Indoor unit

KIT

1.8°F (1°C)

3.6°F (2°C)

YES 30 minutes Compressor allowed to operate to low limit set by S3

NO 15 minutes Electric heating allowed to operate to high limit set by S3

E-square value (0.5 hour)

1.5 hours

1.8°F (1°C)
3.6°F (2°C) /
Short circuit W1 and W2 DH is off by default

3.6°F (2°C)
5.4°F (3°C) /
W1, W2 separate DH on

SW4-1 SW4-2 SW4-3

000 is the default 000/001/010/011/100/101/110/111, internal machines with different abilities, electric heating and PSC classification for use

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 7

40MBAB: Service Manual

WIRING
Use the following steps to wire the indoor unit.
NOTE: Wiring in this section is for the base unit ONLY.
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.

L1 L2 S
Pass the belt through the hole of the ferrite core (Magnetic Ring to secure it to the cable
Fig. 10 — Ferrite Core (Magnetic Ring)
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.

Circuit Breaker (purchased separately)

(purchased separately)
3 Pole Disconnect (purchased separately)

Fig. 11 — Wiring Connection of Indoor 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.
Circuit Breaker

Fig. 9 — Control Box and Wiring Diagram
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.

Electrical heater unit power wires (DO NOT connect to
Electrical the indoor unit heater circuit breaker!) unit
Fig. 12 — Wiring Connection of Electric Heater (optional)

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 8

40MBAB: Service Manual

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. For this scenario to be enabled SW1-1 must be set to the ON position.

Fig. 13 — Connection Methods for 18K-36K Residential Units

Fig. 14 — Connection Methods for 36K-60K Light Commercial Units
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 9

40MBAB: Service Manual
WIRING DIAGRAMS

T1
T2A T2B
T2 Output:12VDC
Cn34 Output:220VAC
Cn15

WATER LEVEL SWITCH
Alarm
work

HEATER

UVLE D Output

ECM M
2

4(3) 3

CN4 3 CN4 6 CN6 CN2 9 Output:24VAC Output:5VDC Output:5VDC Output:5VDC

3
Cn1 2 Output:24VAC

CN2 3CN3 3 CN 5 CN21

Output:12VDC

Output:5VDC

J1

INDOOR UNIT MAINBOARD

Output:15VDC

DRY CONTACT
DRY CONTACT
Cn1 8 Y/ G

CN2 0 S1 S2

L and N :230VAC NL CN1 1
2

Output:24VAC Output:220VAC
CN9 CN2 2 Cn1 0

6

RE D TRAN S RE D

BLU E

RE D

2

Y/ G

BLAC K

RE D

COMMUNICATION TO OUTDOOR UNIT

2
L1 L2
TO OUTDOOR UNIT OR POWER

CN4 CN5 Cn 1
Output:24VAC Output:24VAC Output:+15VDC

CONTROLLE R

2 WIR E WIR E

Remot e Contro l

R C L
Output:+12VDC G Y1 Y/Y 2

4

ON/OF F CN 2

CN 7

Output:+15VDC

JR 1
Output:24VAC Output:24VAC Output:24VAC Output:24VAC CN 6 CN 9 CN1 0 CN1 1

B W W1

W2

E/AU X

DH

CN1 4
Output:+12VDC
Output:+5VDC CN 3 E Y X

24V THERMOSTAT

TCoomCmC.MBu s

48 5 POR T

CODE ECM T1 T2 T2A T2B

Fig. 15 — Wiring Diagram Sizes 18K/24K/30K/36K – Non Light-Commercial Models Table 3 — Wiring Diagram Sizes 18K/24K/30K/36K – Non Light-Commercial Models

Indoor ECM Motor Room Temperature Coil Temperature Sensor Indoor Coil Inlet Temperature Sensor Indoor Coil Outlet Temperature Sensor

PART NAME

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 10

40MBAB: Service Manual
WIRING DIAGRAMS (CONT)

T2 Output:12VDC
Cn34 Output:220VAC
Cn15

T1

WATER LEVEL SWITCH
Alarm
work

HEATER

UVLE D Output

ECM M
2

T2 A T2 B

4(3) 3

3

CN4 3 CN4 6 CN 6 CN2 9
Output:24VAC Output:5VDC Output:5VDC Output:5VDC

Cn1 2 Output:24VAC

CN2 3CN3 3 CN 5 CN2 1

Output:12VDC

Output:5VDC

J1

INDOOR UNIT MAINBOARD

Output:15VDC

DRY CONTACT
DRY CONTACT
Cn1 8 Y/ G

L and N :230VAC S and N :0-24VDC
N LS
CN1 1
3

Output:24VAC Output:220VAC
CN9 CN2 2 Cn1 0

6

RE D TRAN S RE D

BLU E

RE D

2

BLAC K YELLO W (WHITE )

RE D

2
L1 1L2 2S3 Y/ G
TO OUTDOOR UNIT

CN4 CN5 Cn 1
Output:24VAC Output:24VAC Output:+15VDC

2 WIR E WIRE CONTROLLER

Remote Control

4

Output:+12VDC ON/OFF
CN 2

CN 7 CN1 4
Output:+15VDC Output:+12VDC

R C L G Y1 Y/Y 2
B W W1
W2 E/AU X DH

JR 1
Output:24VAC Output:24VAC Output:24VAC Output:24VAC CN 6 CN 9 CN1 0 CN1 1

Output:+5VDC
CN 3 E Y X

24V THERMOSTAT

TCoomCmC.MBus

48 5 POR T

Fig. 16 — Wiring Diagram Sizes 36K – 60K Light Commercial Models

CODE ECM CAP FAN T1 T2 T2A T2B

Table 4 — Wiring Diagram Sizes 36K – 60K Light Commercial Models

Indoor ECM Motor Indoor Fan Capacitor Indoor Fan Motor Room Temperature Sensor Coil Temperature Sensor Indoor Coil Inlet Temperature Sensor Indoor Coil Outlet Temperature Sensor

PART NAME

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 11

40MBAB: Service Manual
REFRIGERANT LINES
General refrigerant line sizing 1. The outdoor units are shipped with a full charge of R410A refrigerant. All charges, line sizing, and capacities are based on runs of 25 ft. (7.6 m). For runs over 25 ft. (7.6 m), consult the product data. 2. Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m). 3. Refrigerant lines should not be buried in the ground. If it is necessary to bury the lines, not more than 36 in. (914 mm) should be buried. Provide a minimum 6 in. (152 mm) vertical rise to the service valves to prevent refrigerant migration. 4. Both lines must be insulated. Use a minimum of ½ in. (12.7 mm) thick insulation. Closed-cell insulation is recommended in all long-line applications. 5. Special consideration should be given to isolating interconnecting tubing from the building structure. Isolate the tubing so that vibration or noise is not transmitted into the structure. 6. For piping runs greater than 25 ft. (7.6 m), add refrigerant up to the allowable length as specified in the product data.

Refrigerant Coil Specifications

DUCTED INDOOR COIL

UNIT SIZE

Table 5 — Refrigerant Coil Specifications

Number of rows
Tube pitch (a)x row pitch (b)
Fin Spacing
Fin type Fin Material
Tube outside dia.
Nominal Tube Wall Tube Enhancement Tube Material
Coil length x height x width
Face area Number of circuits Metering Device High Burst Pressure Low Burst Pressure Design (high/low) Burst Pressure Gas Pipe (size connection type) Liquid Pipe (size connection type)

in mm FPI mm
inch mm mm (inch) (Yes/ No)
inch mm ft2
inch Psi (MPa) Psi (MPa)
Psi In (mm) In (mm)

18

24

30/36/48

60

3

4

5

0.83×0.53

21×13.37

20

1.3

Louvered

Gold hydrophilic aluminum

0.276

7

0.00945 (0.24)

Yes

Copper

16.34×13.23×1.58×2

16.34×21.5×2.11×2 16.34×21.5×2.63×2

415x336x40.11×2

41554653.482 41554666.852

3

4.88

6

10

14

No metering device in indoor unit – information provided in Outdoor Unit’s PSR

550(3.79)

340(2.34)

550/340

Ø1/2″ (12.7)

ø5/8″ (15.9)

Ø7/8″ (22)

Ø1/4″ (6.35)

ø3/8″ (9.52)

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 12

40MBAB: Service Manual

TROUBLESHOOTING

WARNING
Turn off all power supplies or disconnect all wires to avoid electric shock. While checking indoor/outdoor PCB, please equip oneself with anti-static gloves or wrist strap to avoid damage to the board.

WARNING
Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting.

Test the voltage between P and N on back of the outdoor unit main PCB with a multimeter. If the voltage is lower than 36V, the capacitors are fully discharged.

Error Display (Indoor Unit)

When the indoor unit encounters a recognized error, an error code appears (see Table 6).

DISPLAY EH00 EL01 EL16 EH03 EH60 EH61 EH62 EH65 ELOC EH06 EH0E EC07 EC51 EC52 EC53 EC54 EC56 PC00 PC01 PC02 PC03 PC04 EC0d PC0L FL09

Table 6 — Error Display (Indoor Unit)
ERROR INFORMATION Indoor unit EEPROM parameter error Indoor / outdoor unit communication error Communication malfunction between adapter board and outdoor main board The indoor fan speed is operating outside of the normal range (for some models) Indoor room temperature sensor T1 is in open circuit or has short circuited Evaporator coil temperature sensor T2 is in open circuit or has short circuited Evaporator coil temperature sensor T2B is in open circuit or has short circuited Evaporator coil temperature sensor T2A is in open circuit or has short circuited Refrigerant Leakage Detection (for some models) Communication error between indoor two chips Water-level alarm malfunction The outdoor fan speed is operating outside of the normal range (for some models) Outdoor unit EEPROM parameter error Condenser coil temperature sensor T3 is in open circuit or has short circuited Outdoor room temperature sensor T4 is in open circuit or has short circuited Compressor discharge temperature sensor TP is in open circuit or has short circuited Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited (for free match indoor units) IPM malfunction or IGBT over-strong current protection Over voltage or over low voltage protection Top temperature protection of compressor or High temperature protection of IPM module Low pressure protection (for some models) Inverter compressor drive error Outdoor unit malfunction Low ambient temperature protection Mismatch between the new and old platforms

SOLUTION Page 16 Page 17 Page 32 Page 22 Page 22 Page 22 Page 22 Page 22 Page 23 -Page 24 Page 20 -Page 22 Page 22 Page 22 -Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 30 Page 32

For other errors: The display board may display a code or a code undefined by the service manual. Ensure the code is not a temperature reading.

DISPLAY EH63

Table 7 — Error Display on Two Way Communication Wired Controller
MALFUNCTION OR PROTECTION Communication error between wire controller and indoor unit

The other error codes displayed on the wire controller are the same from those on the unit.

SOLUTION —

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 13

40MBAB: Service Manual

Quick Maintenance by Error Code
Review the following tables for common faulty parts associated with each error code.

PART REQUIRING REPLACEMENT
Indoor PCB Outdoor PCB Indoor fan motor T1 sensor T2 Sensor T2B Sensor T2A Sensor T3 Sensor T4 Sensor Reactor Compressor Additional refrigerant Water- level switch Water pump

Table 8 — Quick Maintenance by Error Code

ERROR CODE

EH 00 EL 01 EH 03 EH 60 EH 61 EH 62

x

EH 65
x x x x x x x x x x x x

EL 0C
x x x x x x x x x x x x

EH 0E
x x x x x x x x x x x

EC 53
x x x x x x x x x x x x

PART REQUIRING REPLACEMENT Indoor PCB Outdoor PCB Outdoor fan motor T3 Sensor TP Sensor Pressure sensor Reactor Compressor IPM module board Low pressure protector Additional refrigerant

Table 9 — Quick Maintenance by Error Code

EC 54 EC 51 EC 5C EC 52 EC07/71/72/73 PC 00

x

PC 01
x x x x x x x x

PC 02
x x x x x x x x

PC 04
x x x x x x x

PC 03
x x x x x x x x

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 14

40MBAB: Service Manual

Quick Maintenance by Error Code (Cont.)

Table 10 — Quick Maintenance by Error Code

PART REQUIRING REPLACEMENT Indoor PCB Outdoor PCB Outdoor fan motor

EL 16 x

x

EH 0B

x x

PC 06 x

x

PC 08/44/ 49
x

T3 Sensor TP Sensor

x

Pressure sensor Reactor

x

Compressor IPM module board Data adapter board High pressure valve assembly

x

High pressure protector

x

Low pressure protector Additional refrigerant

x

PC 0A x

x x x x x x x x x

PC 0F x

x x x x

x x x x x x x

Table 11 — Quick Maintenance by Error Code

PART REQUIRING REPLACEMENT

PC 41

PC 43

PC 10/11/12

PC 30

PC 31

PC 40

Indoor PCB Outdoor PCB Outdoor fan motor T3 Sensor TP Sensor Pressure sensor Reactor Compressor IPM module board Data adapter board High pressure valve assembly High pressure protector Low pressure protector Additional refrigerant Electric control box

x

NOTE: For certain models, the outdoor PCB can not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 15

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION
EH00 – EEPROM Parameter Error Diagnosis and Solution
Description: Indoor or outdoor PCB main chip does not receive feedback from the EEPROM chip. Recommended parts to prepare: · Indoor PCB · Outdoor PCB
Troubleshooting and Repair:
Shut o the power and turn it on 2 minutes later.

Is it s

displaying the

No

error code?

Yes
Replace the indoor main PCB (EH 00)/ outdoor main PCB (EC 51)
NOTE: The priority is EH00 followed by EC51.

The unit is operang normally.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 16

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EL01 – Indoor and Outdoor Unit Communication Error Diagnosis and Solution
Description: Indoor unit can not communicate with the outdoor unit.
Recommended parts to prepare: · Signal wires · Magnet ring · Indoor PCB · Outdoor PCB Troubleshooting and Repair:
XYE Communication:

Power off, then restart the unit 2 minutes later.
Yes

Check whether there is any interference.

Are there too many lamps, power transformers?

Yes

Is the signal wire too long?

No

Check whether the signal wire is

shield cable or whether the

No

shield cable is ground.

Yes

Check whether the wire has the correct polarity; P to P, Q to Q, or E to E.

No

Yes

Check whether the signal wire is broken.

Yes

No

Check whether the signal wires

No

are inserted on the PCB firmly.

Yes

Replace the indoor main PCB. Is the error resolved?
No

Replace the outdoor main PCB.

Remove the interference or add a magnet ring on the power wire.
Use a shield cable grounding.
Correct the connection .. Replace the signal wire. Pull out and re-insert.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 17

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
(S) Current Loop Communication:
Power off, then restart the unit af ter 2 minutes.

Does the error code disappear?
Yes

No

Solved

Check t he w iring connection bet ween indoor and out door
unit, are t hey good?

No

Correct the connection or change w ires

Yes
Measure the DC voltage between N/L2 and S (Black pin to S , Red pin to N/L2).

The value is alt ernative from negat ive to posit ive
The value is fixed and close to 0

Check t he w iring connection from indoor terminal t o indoor
PCB, are t hey good?

Repalce indoor PCB

The value is alw ays posit ive

For unit s with only one PCB

Check t he w iring connection from outdoor terminal t o outdoor PCB and wiring bet ween PCBs if t here is more t han 1 PCB

For unit s with main PCB and IPM board both

Check t he AC volt age of L, N output t o IPM board, is it same No
as pow er input?
Yes Unplug all the high voltage components connected t o main PCB such as 4 way valve, heater, AC f an one by one t o check their resist ance. Is there any component
short circuit?
No
Check t he DC 5V, 12V from IPM board t o main PCB, are t hey normal?
No

Replace main PCB

Replace out door PCB Yes

Replace short-circuited

Yes

component and main

PCB

Yes

Replace short-circuited

component and outdoor

Yes

PCB

No

Unplug elect ronic expansion valve. Check if t he DC 5V, 12V to main
PCB are OK

Yes

Replace coil of elect ronic expansion valve

Yes

Check if t he pow er LED is on?
No
Unplug all the high voltage components connected t o main PCB such as 4 way valve, heater, AC f an one by one t o check their resist ance. Is there any component
short circuit? No
Unplug elect ronic expansion valve. Check if pow er LED is on?

No

Replace IPM board

Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 18

40MBAB: Service Manual
REMARKS: · Use a multimeter to test the DC voltage between the 2 port (or S or L2 Terminal) and the 3 port (or N or S Terminal) of the outdoor unit. · The red pin of the multimeter connects with the 2 port (or S or L2 port) while the black pin is for the 3 port (or N or S Terminal). · When the unit is normal running, the voltage is moving alternately as positive values and negative values. · If the outdoor unit malfunctions, the voltage remains a positive value. · If the indoor unit malfunctions, the voltage does not change.
S and N or
L2 and S or
2 and 3
· Use a multimeter to test the reactor resistance which does not connect with the capacitor. · The normal value should be around zero ohm. Otherwise, the reactor has malfunctioned.
NOTE: The figures and values are for reference only, actual condition and specific value may vary.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 19

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EH03 / EC07 – Fan Speed Is Operating Outside of Normal Range / EC 71 Over Current Failure of Outdoor DC Fan Motor / EC73 Zero-speed failure of outdoor DC fan motor Diagnosis and Solution
Description: When the indoor / outdoor fan speed operates at too low or too high a speed for a certain time, the unit ceases operation and the LED displays the failure.
Recommended parts to prepare: · Connection wires · Fan assembly · Fan motor · PCB Troubleshooting and Repair:
Power off. Restart the unit after 2 minutes.

Does a problem remain?

NO

YES
Shut off the power supply. Rotate the fan by hand.

The unit is operating normally.

Does it turn easily?

NO

YES Check the fan motor wiring.

Inspect the unit for an obstruction and remove.

Is it improperly wired?
YES Measure the voltage for the fan motor from the PCB.

Ensure the proper connections.

Is it within normal parameters?

NO

Replace the main PCB.

YES Replace the fan motor.

NOTE: For certain models, the outdoor PCB cannot be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 20

40MBAB: Service Manual
Index:
1. Indoor DC Fan Motor (control chip is on PCB) Power on the unit and when the unit is in the STANDBY mode, measure the pin1&pin2 voltage of CN15, and pin3 of CN34 in the fan motor connector. If the voltage value is not in the range shown in Table 12, the PCB has an issue and needs to be replaced.

Table 12 — CN34

NO.

COLOR

SIGNAL

VOLTAGE

1

/

2

Black

GND

3

Orange

PWM

5-12VDC

4

Blue

FG

0-12DVC

Table 13 — CN15

NO.

COLOR

SIGNAL

VOLTAGE

1

Yellow

208/230VAC

2

Black

208/230VAC

3

Yellow-Green

GND

2. Outdoor DC Fan Motor (control chip is in outdoor PCB)
Release the UVW connector. Measure the resistance of U-V, U-W, V-W. If the resistance is not equal to each other, the fan motor has an issue and needs to be replaced. Otherwise the PCB has an issue and needs to be replaced.

Fig. 17 — Outdoor DC Fan Motor
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 21

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EH60/EH61/EH62/EH65/EC53/EC52/EC54 – Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution
Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure. Recommended parts to prepare: · Connection wires · Sensors · PCB Troubleshooting and Repair:
Check the connection between the temperature sensor and the PCB.

Is it properly wired?
YES Measure the sensor’s
resistance value.

NO

Ensure the proper connections.

Is it within acceptable parameters?

NO

Replace the sensor.

YES Replace the indoor PCB ((EH XX)
or the outdoor PCB (EC XX))
NOTE: The priority is EC 52 >EC 53 > EC54 > EC55 > EC 56 > EH 60 > EH61 > EH62

EH 65.

Fig. 18 — Test NOTE: For certain models, the outdoor PCB could not be removed separately. In this case, the outdoor electric control box
should be replaced as a whole. Figure 18 and the value within are for reference only. The actual appearance and value may vary.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 22

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EL0C – Refrigerant Leakage Detection Diagnosis and Solution
Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure. Recommended parts to prepare: · Indoor PCB · Additional Refrigerant Troubleshooting and Repair:
Power off, then restart the unit 15 minutes later.
Place your hands in front of the indoor air outlet.

Is cool or hot air blowing from the indoor
air outlet?
NO Check system for leaks.
NO
Are there any leaks?
NO Charge the refrigerant correctly (about 10% of the nameplate charge).

YES

Is T2 loose ?

NO

YES

Ensure proper connections.

Is T1 too close to the evaporator?

YES

Install correctly.

NO

Replace the indoor PCB.

YES

Repair the leak and recharge the refrigerant.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 23

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EH0E – Water-Level Alarm Malfunction Diagnosis and Solution
Description: If the sampling voltage is not 5V, the LED displays the failure code. Recommended parts to prepare: · Connection wires · Water-level switch · Water pump · Indoor PCB Troubleshooting and Repair:
Power off, then restart the unit 2 minutes lat er.

Does a problem
remain?
YES
Is the water-level switch
inserted properly? YES
Is the water level switch broken?
YES
Replace the indoor main PCB

NO The unit is operating normally.

NO

Insert the water-level switch properly

NO Replace the water-level switch

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 24

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 00 – IPM malfunction or IGBT over-strong current protection Diagnosis and Solution
Description: When the voltage signal that the IPM sends to the compressor drive chip is abnormal, the LED displays “PC 00” and the AC turns off.
Recommended parts to prepare: · Connection wires · IPM module board · Outdoor fan assembly · Compressor · Outdoor PCB
Troubleshooting and Repair:

Check the wiring between PCB and compressor.
Does an error exist?
NO Check the IPM.
Is it in working order?
YES Check the outdoor fan and the
outdoor unit ventilation.
Is it in working order? YES
Check the compressor resistance values.
Are they within acceptable parameters?
YES Replace the outdoor PCB.

YES NO NO
NO

Ensure proper connections or replace the wires and connectors.
Replace the IPM board or replace the outdoor PCB.
Refer to the “Fan Speed is Out of Control” malfunction solution.
Replace the compressor.

NOTE: For certain models, the outdoor PCB cannot be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 25

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 01 – Over voltage or too low voltage protection / PC 10 – Outdoor unit low AC voltage protection / PC 11 – Outdoor unit main control board DC bus high voltage protection / PC 12 (Outdoor unit main control board DC bus high voltage protection / 341 MCE error Diagnosis and Solution
Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Recommended parts to prepare: · Power supply wires · IPM module board · PCB · Reactor
Troubleshooting and Repair:

Check the power supply.

Is it in working order?

NO

YES Check the connections and wires .

Are they in working order?

NO

YES
Power on and measure the voltage between P and N.

Turn off the unit.
Ensure proper connections or replace the wires.

While the unit is in STANDBY mode, is the voltage between P and N and around DC 310V, 340V or 380V? When the unit is started,
is it in 220V~400V?

NO

Replace the IPM board.

YES Check the reactor.

Is it in working order? YES
Replace the reactor.

NO

Replace outdoor PCB.

NOTE: For certain models, the outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 26

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 02 – Top temperature protection of compressor or High temperature protection of IPM module Diagnosis and Solution
Description: For some models with overload protection, if the sampling voltage is not 5V, the LED displays the failure. If the IPM module temperature is higher than a certain value, the LED displays the failure code.
Recommended parts to prepare: · Connection wires · High pressure protector · IPM module board · System blocks · Outdoor PCB
Troubleshooting and Repair:

Check if the air flow system

of the indoor and outdoor units

Yes

is obstructed.

Clear the air inlet and outlet or the indoor and outdoor unit’s heat exchanger.

No
Turn off the power supply. Wait 10 minutes and turn back on.
Yes

Check if the compressor top temperature is higher than 194°F(90°C).
Yes
Check if the refrigerant system is normal.
Yes

Check if all the connection, especially the

No

connection of OLP (Over Load Protector) No Correct the connection.

sensor is good.

Yes

Measure the resistance between the two ports of
the OLP. Is it zero?

No

Replace the OLP.

No

Yes

Replace the outdoor control PCB.

Repair the refrigerant system.

Check the fastening screws on the PCB and IPM radiator.

Are they secure?

YES

NO
Tighten the screws and apply silicon grease.

Replace the outdoor control PCB.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 27

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 03 – Low Pressure Protection Diagnosis and Solution
Description: If the sampling voltage is not 5V, the LED displays a failure code. Recommended parts to prepare: · Connection wires · Low pressure protector · Indoor fan assembly · Outdoor PCB Troubleshooting and Repair:
Low pressure protection

Are the low pressure protector and main control board wired
properly??

No

Reconnect the low pressure protector and main control board.

Yes

Is the low pressure protector broken? Method: Disconnect the plug.
Measure the resistance of the low pressure Yes protector. If the protector is normal, the value is 0.
No

Replace the low pressure protector.

Is the outdoor ambient temperature too low ?

Yes

Stop the unit.

No

Is the valve core of the high pressure valve fully opened?
Yes
Is the indoor fan running properly in cooling mode?
Yes

No

Open the valve core of the high

pressure valve.

Refer to the solution to the malfunction No of fan speed being out of control. Find
the cause and resolve the problem. .

Replace outdoor main board.

Is it in working order??

No

When the refrigerant level is not

su cient, does the system function properly after more refrigerant

No

is added?

Check whether the refrigerant system is functioning properly ..

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 28

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
PC 04 – Inverter compressor drive error Diagnosis and Solution
Description: An abnormal inverter compressor drive is detected by a special detection circuit, including the communication signal detection, voltage detection, compressor rotation speed signal detection.
Recommended parts to prepare: · Connection wires · IPM module board · Outdoor fan assembly · Compressor · Outdoor PCB Troubleshooting and Repair:

Check the wiring between the PCB and compressor.

Is it improperly wired? NO
Check the IPM.

YES

Ensure proper connections or replace

the wires and connectors.

Is it functioning properly?

NO

YES
Check the outdoor fan and the outdoor unit ventilation.

Replace the IPM board or replace the outdoor PCB.

Is it functioning properly?

NO

Please refer to “Fan Speed Malfunction”

YES
Check the compressor resistance values.

Are they within acceptable parameters?

NO

Replace the compressor.

YES Replace the outdoor PCB.
NOTE: For certain models, the outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 29

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EC 0d – Outdoor Unit Malfunction Diagnosis and Solution
Description: The indoor unit detects the outdoor unit has an error. Recommended parts to prepare: · Outdoor unit Troubleshooting and Repair:

Is the main board displaying an error??
Yes
Refer to the prescribed steps for resolving the
issue.

WZZ,,then restart the unit 22

No

minutes later..Does the outdoor main board display an error code a few

minutes later?

Yes

DIAGNOSIS AND SOLUTION (CONT.)
PC 0L – Low ambient temperature protection Diagnosis and Solution
Description: It is a protection function. When the compressor is off, the outdoor ambient temperature(T4) is lower than -31°F (35°C) for 10 second, the unit stops and displays the failure code. When the compressor is on and the outdoor ambient temperature(T4) is lower than -40°F for 10 seconds, the unit stops and displays the failure code. When the outdoor ambient temperature(T4) is no lower than -25°F for 10 seconds, the unit exits protection.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 30

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EH 0b – Communication error between the two indoor chips Diagnosis and Solution
Description: Indoor PCB main chip does not receive feedback from another chip. Recommended parts to prepare: · Indoor main board · Adapter board adapter Troubleshooting and Repair:
Shut off the power supply and turn it on 2 minutes later.

Is it still displaying the error code?
Yes
Check the connection wires between the adaptor board
and the main board. Is it connected properly?
No
Reconnect and retry. Does the error still appear?
Yes No
Replace the transfer board. Is the system running normally?
No
Replace the indoor main board.

Yes Yes
Trouble is resolved.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 31

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EL 16 – Communication malfunction between adapter board and outdoor main board Diagnosis and Solution
Description: The adapter PCB cannot detect the main control board. Recommended parts to prepare: · Connection wires · Adapter board · Outdoor main PCB Troubleshooting and Repair:
Power off, then restart the unit after 3 minutes.

Does a problem remain?

NO

YES Check the wirings and connections.

The unit is operating normally.

Are all the connections

NO

good?

YES

Replace the adapter main PCB.

Ensure proper connections.

Does the error still exist?
YES Replace the outdoor main control board.

NO

The problem is solved.

DIAGNOSIS AND SOLUTION (CONT.)
FL 09 – Indoor and outdoor mismatch malfunction Diagnosis and Solution
Description: Indoor and outdoor units are mismatched, the LED displays this code. Replace the matching indoor or outdoor unit.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 32

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
P5 – Indoor Units Mode Conflict (Match with a Multi Outdoor Unit) Diagnosis and Solution
Description: The indoor units cannot work in the COOLING and HEATING modes at the same time. The HEATING mode has the priority. Suppose the indoor unit (A) is working in the COOLING mode or the FAN mode and the indoor unit (B) is set to the HEATING mode. The indoor unit (A) turns off and indoor unit (B) keeps running in the HEATING mode. Suppose the indoor unit (A) is working in the HEATING mode, and indoor unit (B) is set to COOLING mode or the FAN mode, then indoor unit (B) changes to STANDBY and indoor unit (A) remains in the current mode.

Table 14 — Indoor Units Mode Conflict

COOLING MODE HEATING MODE
FAN OFF

COOLING MODE No Yes No No

HEATING MODE Yes No Yes No

FAN No Yes No No

OFF No No No No

NOTE:
No: No mode conflict Yes: Mode conflict

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 33

40MBAB: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
Temperature Sensor Check
WARNING
Turn off all power supplies or disconnect all wires to avoid electric shock. Operate after compressor and coil have returned to normal temperature in case of injury.
1. Disconnect the temperature sensor from the PCB. 2. Measure the sensor’s resistance value using a multi-meter. 3. Check the corresponding temperature sensor resistance value.
Fig. 19 — Temperature Sensor Check NOTE: Figure 19 is for reference only. The actual condition and specific value may vary according to temperature.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 34

40MBAB: Service Manual
Compressor Check
1. Disconnect the compressor power cord from the outdoor PCB. 2. Measure the resistance value of each winding using a multi-meter. 3. Check the resistance value of each winding using Figure 20.
Fig. 20 — Input Terminal (typical)
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 35

40MBAB: Service Manual
APPENDICES
Appendix 1

Table 15 — Temperature Sensor Resistance Value Table for T1, T2, T3, T4 (°C–K)

°C

°F

K OHM

°C

°F

K OHM

°C

°F

K OHM

°C

° F

-20

-4

115.266

20

68

12.6431

60

140

2.35774

100

212

-19

-2

108.146

21

70

12.0561

61

142

2.27249

101

214

-18

0

101.517

22

72

11.5

62

144

2.19073

102

216

-17

1

96.3423

23

73

10.9731

63

145

2.11241

103

217

-16

3

89.5865

24

75

10.4736

64

147

2.03732

104

219

-15

5

84.219

25

77

10

65

149

1.96532

105

221

-14

7

79.311

26

79

9.55074

66

151

1.89627

106

223

-13

9

74.536

27

81

9.12445

67

153

1.83003

107

225

-12

10

70.1698

28

82

8.71983

68

154

1.76647

108

226

-11

12

66.0898

29

84

8.33566

69

156

1.70547

109

228

-10

14

62.2756

30

86

7.97078

70

158

1.64691

110

230

-9

16

58.7079

31

88

7.62411

71

160

1.59068

111

232

-8

18

56.3694

32

90

7.29464

72

162

1.53668

112

234

-7

19

52.2438

33

91

6.98142

73

163

1.48481

113

235

-6

21

49.3161

34

93

6.68355

74

165

1.43498

114

237

-5

23

46.5725

35

95

6.40021

75

167

1.38703

115

239

-4

25

44

36

97

6.13059

76

169

1.34105

116

241

-3

27

41.5878

37

99

5.87359

77

171

1.29078

117

243

-2

28

39.8239

38

100

5.62961

78

172

1.25423

118

244

-1

30

37.1988

39

102

5.39689

79

174

1.2133

119

246

0

32

35.2024

40

104

5.17519

80

176

1.17393

120

248

1

34

33.3269

41

106

4.96392

81

178

1.13604

121

250

2

36

31.5635

42

108

4.76253

82

180

1.09958

122

252

3

37

29.9058

43

109

4.5705

83

181

1.06448

123

253

4

39

28.3459

44

111

4.38736

84

183

1.03069

124

255

5

41

26.8778

45

113

4.21263

85

185

0.99815

125

257

6

43

25.4954

46

115

4.04589

86

187

0.96681

126

259

7

45

24.1932

47

117

3.88673

87

189

0.93662

127

261

8

46

22.5662

48

118

3.73476

88

190

0.90753

128

262

9

48

21.8094

49

120

3.58962

89

192

0.8795

129

264

10

50

20.7184

50

122

3.45097

90

194

0.85248

130

266

11

52

19.6891

51

124

3.31847

91

196

0.82643

131

268

12

54

18.7177

52

126

3.19183

92

198

0.80132

132

270

13

55

17.8005

53

127

3.07075

93

199

0.77709

133

271

14

57

16.9341

54

129

2.95896

94

201

0.75373

134

273

15

59

16.1156

55

131

2.84421

95

203

0.73119

135

275

16

61

15.3418

56

133

2.73823

96

205

0.70944

136

277

17

63

14.6181

57

135

2.63682

97

207

0.68844

137

279

18

64

13.918

58

136

2.53973

98

208

0.66818

138

280

19

66

13.2631

59

138

2.44677

99

210

0.64862

139

282

K OHM 0.62973 0.61148 0.59386 0.57683 0.56038 0.54448 0.52912 0.51426 0.49989
0.486 0.47256 0.45957 0.44699 0.43482 0.42304 0.41164 0.4006 0.38991 0.37956 0.36954 0.35982 0.35042 0.3413 0.33246 0.3239 0.31559 0.30754 0.29974 0.29216 0.28482 0.2777 0.27078 0.26408 0.25757 0.25125 0.24512 0.23916 0.23338 0.22776 0.22231

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 36

40MBAB: Service Manual

Appendix 2

Table 16 — Temperature Sensor Resistance Value Table for T5 (TP) (°C–K)

° C

° F

K OHM

° C

° F

K OHM

° C

° F

K OHM

° C

° F

-20

-4

542.7

20

68

68.66

60

140

13.59

100

212

-19

-2

511.9

21

70

65.62

61

142

13.11

101

214

-18

0

483

22

72

62.73

62

144

12.65

102

216

-17

1

455.9

23

73

59.98

63

145

12.21

103

217

-16

3

430.5

24

75

57.37

64

147

11.79

104

219

-15

5

406.7

25

77

54.89

65

149

11.38

105

221

-14

7

384.3

26

79

52.53

66

151

10.99

106

223

-13

9

363.3

27

81

50.28

67

153

10.61

107

225

-12

10

343.6

28

82

48.14

68

154

10.25

108

226

-11

12

325.1

29

84

46.11

69

156

9.902

109

228

-10

14

307.7

30

86

44.17

70

158

9.569

110

230

-9

16

291.3

31

88

42.33

71

160

9.248

111

232

-8

18

275.9

32

90

40.57

72

162

8.94

112

234

-7

19

261.4

33

91

38.89

73

163

8.643

113

235

-6

21

247.8

34

93

37.3

74

165

8.358

114

237

-5

23

234.9

35

95

35.78

75

167

8.084

115

239

-4

25

222.8

36

97

34.32

76

169

7.82

116

241

-3

27

211.4

37

99

32.94

77

171

7.566

117

243

-2

28

200.7

38

100

31.62

78

172

7.321

118

244

-1

30

190.5

39

102

30.36

79

174

7.086

119

246

0

32

180.9

40

104

29.15

80

176

6.859

120

248

1

34

171.9

41

106

28

81

178

6.641

121

250

2

36

163.3

42

108

26.9

82

180

6.43

122

252

3

37

155.2

43

109

25.86

83

181

6.228

123

253

4

39

147.6

44

111

24.85

84

183

6.033

124

255

5

41

140.4

45

113

23.89

85

185

5.844

125

257

6

43

133.5

46

115

22.89

86

187

5.663

126

259

7

45

127.1

47

117

22.1

87

189

5.488

127

261

8

46

121

48

118

21.26

88

190

5.32

128

262

9

48

115.2

49

120

20.46

89

192

5.157

129

264

10

50

109.8

50

122

19.69

90

194

5

130

266

11

52

104.6

51

124

18.96

91

196

4.849

12

54

99.69

52

126

18.26

92

198

4.703

13

55

95.05

53

127

17.58

93

199

4.562

14

57

90.66

54

129

16.94

94

201

4.426

15

59

86.49

55

131

16.32

95

203

4.294

16

61

82.54

56

133

15.73

96

205

4.167

17

63

78.79

57

135

15.16

97

207

4.045

18

64

75.24

58

136

14.62

98

208

3.927

19

66

71.86

59

138

14.09

99

210

3.812

K OHM 3.702 3.595 3.492 3.392 3.296 3.203 3.113 3.025 2.941 2.86 2.781 2.704 2.63 2.559 2.489 2.422 2.357 2.294 2.233 2.174 2.117 2.061 2.007 1.955 1.905 1.856 1.808 1.762 1.717 1.674 1.632

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 37

40MBAB: Service Manual
DISASSEMBLY INSTRUCTIONS
Electrical Parts (Anti-static gloves must be worn)
PROCEDURES

ILLUSTRATION

1. Remove the 2 screws of the upper cover plate assembly then remove it.

2. Remove 2 screws then unplug the plugs. 3. Pull out the electric control box subassembly.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 38

40MBAB: Service Manual
DISASSEMBLY INSTRUCTIONS (CONT.)
Electrical Parts (Anti-static gloves must be worn) (CONT.)
PROCEDURES

ILLUSTRATION

4. Remove the 2 screws and 1 ground screw.
5. Unplug the plugs then remove the main control board subassembly.

6. Release the data transfer module control board screw (1) and remove the board.
7. Release the 2 screws then remove the transformer.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 39

40MBAB: Service Manual
DISASSEMBLY INSTRUCTIONS (CONT.)
Fan Motor and Fan
PROCEDURES

ILLUSTRATION

1. Remove the 2 fan assembly screws.

2. Remove the fan assembly.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 40

40MBAB: Service Manual
DISASSEMBLY INSTRUCTIONS (CONT.)
Fan Motor and Fan (Cont)
PROCEDURES

ILLUSTRATION

3. Release the 3 nuts securing the fan motor then remove the fan motor.
4. Release the 1 nut securing the fan and then remove the fan.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 41

40MBAB: Service Manual
DISASSEMBLY INSTRUCTIONS (CONT.)
Evaporator
PROCEDURES

ILLUSTRATION

1. Remove the cover plate.