Carrier 40MBFAQ Service Manual
Carrier 40MBFAQ Service Manual

Carrier 40MBFAQ Service Manual

Floor console ductless system size 12k
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40MBFAQ
Floor Console Ductless System
Size 12K

TABLE OF CONTENTS

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INDOOR UNIT SIZES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
MODEL NUMBER NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . 2
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
WIRING DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
REFRIGERANT CYCLE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . 5
SYSTEM EVACUATION AND CHARGING . . . . . . . . . . . . . . . . . 6
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DIAGNOSIS AND SOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . 39
APPENDICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

SAFETY CONSIDERATIONS

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.
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.
Service Manual
PAGE
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 the switch with a
suitable warning label.
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 has an appendix (see
"APPENDICES" on page 49 for data needed to perform troubleshooting).
Use the Table of Contents to locate a desired topic.
Specifications subject to change without notice.
WARNING
WARNING
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

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Summary of Contents for Carrier 40MBFAQ

  • Page 1: Table Of Contents

    40MBFAQ Floor Console Ductless System Size 12K Service Manual TABLE OF CONTENTS WARNING PAGE WARNING SAFETY CONSIDERATIONS ......1 INTRODUCTION .
  • Page 2: Indoor Unit Sizes

    40MBFAQ: Service Manual INDOOR UNIT SIZES Table 1 — Indoor Unit Size KBTUH V-PH-HZ MODEL NO. 208/230-60 40MBFAQ12XA3 MODEL NUMBER NOMENCLATURE INDOOR UNIT 40 = FAN COIL UNIT VOLTAGE MB = MODEL 3 = 208/230-1-60 F = INDOOR FAN COIL TYPE...
  • Page 3: Electrical Data

    40MBFAQ: Service Manual ELECTRICAL DATA Table 2 — Electrical Data INDOOR FAN INDOOR UNIT MAX FUSE CB AMP SYSTEM POWER V-PH-HZ FLA (A) FACTOR (%) 208-230/1/60 1/55 95.6 Refer to outdoor unit installation instructions. Indoor unit is powered by the outdoor unit.
  • Page 4: Connection Diagrams

    40MBFAQ: Service Manual CONNECTION DIAGRAMS Fig. 1 — Connection Diagram - Size 12K Fig. 2 — Control and Power Wiring WIRING DIAGRAM CODE PART NAME ROOM TEMP.SENSOR PIPE TEMP.SENSOR Note1 :COMPONENT IN DASH LINE Output:310VDC IS OPTIONAL OR FIELDWIRING. CN12...
  • Page 5: Refrigerant Cycle Diagram

    40MBFAQ: Service Manual REFRIGERANT CYCLE DIAGRAM Fig. 4 — Refrigerant Cycle Diagram - Size 12K 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.
  • Page 6: System Evacuation And Charging

    40MBFAQ: Service Manual SYSTEM EVACUATION AND CHARGING Deep Vacuum Method CAUTION The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of ensuring a system is free of air and liquid water (see Fig.
  • Page 7 40MBFAQ: Service Manual Main Protection COOLING Mode Fan Speed is Out of Control Indoor Fan Running Rules When the indoor fan speed remains too low (lower than 300RPM) for 50 In the COOLING mode, the indoor fan runs constantly and either speed seconds, the indoor fan will shut off then restarts 30 seconds later.
  • Page 8 40MBFAQ: Service Manual The AUTO fan is controlled by the rules shown in Fig. 11. Auto Fan Action in HEATING Mode T1-75.2°F (24°C) T1-Td+3°F(1.5°C) ................12°F (6°C) 0°F(0°C) (H-L)*0.75+L (H+-L)*0.2+L ........10°F (5°C) -2°F(-1°C) (H-L)*0.5+L (H+-L)*0.4+L .... -4°F(-2°C) ......
  • Page 9 40MBFAQ: Service Manual Evaporator Coil Temperature Protection Timer Function Timing range is 24 hours • TIMER ON: The unit turns on automatically when reaching the setting time. • TIME OFF: The unit turns off automatically when reaching the setting time.
  • Page 10 40MBFAQ: Service Manual AUTO−RESTART Function Refrigerant Leak Detection The indoor unit is equipped with an AUTO−RESTART function, which With this new technology, the display area displays “EC” when the is carried out through an auto−restart module. In the event of a sudden outdoor unit detects a refrigerant leak.
  • Page 11 40MBFAQ: Service Manual Point Check Function Press LED DISPLAY or AIR DIRECTION to check the next or front item’s information. When the air conditioner enters the Information Enquiry status, it displays the code name in two seconds (see Table 4).
  • Page 12 40MBFAQ: Service Manual Table 5 — Point Check ENQUIRY INFORMATION DISPLAY VALUE MEANING REMARK -1F,-1E,-1d,-1c,-1b,-1A -25,-24,-23,-22,-21,-20 1. The displaying temperature is the actual value. -19—99 -19—99 T1,T2,T3,T4, 2. The temperature is °C no matter what kind A0,A1,…A9 100,101,…109 T2B,TP,TH, of remote control is used.
  • Page 13: Troubleshooting

    40MBFAQ: Service Manual TROUBLESHOOTING Problems may occur that are not covered by a diagnostic code, however are covered by the diagnostic flow charts. These problems are typical air This section provides the required flow charts to troubleshoot problems conditioning mechanical or electrical issues that can be corrected using that may arise.
  • Page 14 40MBFAQ: Service Manual Indoor Unit Diagnostic Guide Table 6 — Indoor Unit Error Display OPERATION LAMP TIMER LAMP DISPLAY ERROR INFORMATION SOLUTION 1 time EH00/EH0A Indoor unit EEPROM parameter error Page 15 2 times EL 01 Indoor / outdoor unit communication error...
  • Page 15: Diagnosis And Solution

    40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION EH 00/EH 0A/EC 51 (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...
  • Page 16 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) EL 01 (Indoor and Outdoor Unit Communication Error Diagnosis and Solution) Description: Indoor unit cannot communicate with the outdoor unit Recommended parts to prepare: • Indoor PCB • Outdoor PCB • Reactor Troubleshooting Power off , then restart the unit after 2 minutes.
  • Page 17 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) Remarks: • Use a multimeter to test the DC voltage between the 2 port (or S or L2 port) and the 3 port (or N or S port) 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 port).
  • Page 18 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) EH 03/EH 31/EH 32/EC 07 (Fan Speed Is Operating Outside of Normal Range Diagnosis and Solution) Description: When the indoor / outdoor fan speed remains too slow or too fast for a certain amount of time, the unit ceases operating and the LED displays the failure.
  • Page 19 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) Index 1. Indoor or Outdoor DC Fan Motor (control chip is in fan motor) Power on the unit and when the unit is in the STANDBY mode, measure the voltage of pin1-pin3, pin4-pin3 in the fan motor connector. If the voltage value is not in the range shown in Table 7, the PCB has malfunctioned and needs to be replaced.
  • Page 20 40MBFAQ: Service Manual CN1 Communication with the Main PCB SIGNAL VOLTAGE +15V 0~6V 0~15V 3. Outdoor DC Fan Motor (control chip is in outdoor PCB) fan motor has Release the UVW connector. Measure the resistance of U-V, U-W, V-W. If the resistance is not equal to each other, the malfunctioned and needs to be replaced.
  • Page 21 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) Diagnosis and Solution) EH 60/EH 61/EC 53/EC 52/EC 54 (Open Circuit or Short Circuit of Temperature Sensor Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays a failure.
  • Page 22 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) EL 0C (Refrigerant Leakage Detection Diagnosis and Solution) Description: Define the evaporator coil temperature T2 of the compressor which starts running as Tcool. After unit start up and five minutes after the compressor starts up, if T2 < Tcool-1°C(1.8°F) does not maintain for 4 seconds and the compressor running frequency (higher than 50Hz) does not maintain for 3 minutes, and this situation occurs 3 times, the display area displays “EL 0C”...
  • Page 23 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) EH 0E (Water-Level Alarm Malfunction Diagnosis and Solution) Recommended parts to prepare: • Connection wires • Water-level switch • Water pump • Indoor PCB Troubleshooting Shut off the power supply and turn it on 2 minutes later.
  • Page 24 40MBFAQ: 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 display LED displays “PC 00” and the air conditioner turns off.
  • Page 25 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) PC 01 (Over voltage or too low voltage protection 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 •...
  • Page 26 40MBFAQ: 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 a communication signal detection, voltage detection, and compressor rotation speed signal detection.
  • Page 27 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) PC 03 (High pressure protection or Low Pressure Protection Diagnosis and Solution) Description: The outdoor pressure switch cuts off the system because the high pressure is higher than 4.4 MPa or the outdoor pressure switch cuts off the system because the low pressure is lower than 0.13 MPa.
  • Page 28 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) PC 03 (High pressure protection or Low Pressure Protection Diagnosis and Solution) (CONT) Troubleshooting Low pressure protection Are the low pressure protector Reconnect the low pressure protector and the main control board wired ? and main control board.
  • Page 29 40MBFAQ: 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 a failure.
  • Page 30 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) PC 0L (Low ambient temperature protection) Description: This is a protection function. When the compressor is off, the outdoor ambient temperature(T4) is lower   than -31 F (-35 C) for 10s, the air conditioner stops and displays the failure code.
  • Page 31 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) EH 0b (Communication error between display board and main board Diagnosis and Solution) Description: The indoor PCB does not receive feedback from the display board Recommended parts to prepare: • Communication wire • Indoor PCB •...
  • Page 32 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) EH b3 (Communication error between wired controller and indoor unit Diagnosis and Solution) Description: If the indoor PCB does not receive feedback from the wired controller, the error displays on the wired controller.
  • Page 33 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) EH bA (Communication malfunction between the external fan module and indoor unit)/EH 3A(External fan DC bus voltage is too low protection)/ EH 3b (External fan DC bus voltage is too high fault Diagnosis and Solution) Description: The indoor unit does not receive feedback from the external fan module during 150 seconds or the indoor unit receives abnormal increases or decreases in voltage from the external fan module.
  • Page 34 40MBFAQ: Service Manual DIAGNOSIS AND SOLUTION (CONT.) FH 07 (Communication malfunction between indoor unit and auto-lifting panel Diagnosis and Solution) Description: The indoor PCB does not receive feedback from the PCB of the auto-lifting panel. Recommended parts to prepare: • Connection wires •...
  • Page 35 40MBFAQ: Service Manual Check Procedures Temperature Sensor Check WARNING WARNING Be sure to 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.
  • Page 36 40MBFAQ: Service Manual Compressor Check 1. Disconnect the compressor power cord from outdoor PCB (refer to “DISASSEMBLY INSTRUCTIONS” on page 39). 2. Measure the resistance value of each winding using a multi-meter. 3. Check the resistance value of each winding in the Tables 8 - 10.
  • Page 37 40MBFAQ: Service Manual IPM Continuity Check WARNING WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1. Turn off the outdoor unit and disconnect the power supply. 2. Discharge the electrolytic capacitors and ensure the energy-storage unit(s) have been discharged.
  • Page 38 40MBFAQ: Service Manual Main Parts Check Temperature Sensor Checking Disconnect the temperature sensor from the PCB, measure the resistance value with a tester. Fig. 20 —Tester Temperature Sensors Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor.
  • Page 39: Disassembly Instructions

    40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS Filter Procedure Illustration 1) Hold both sides of the front panel and open the front panel. 2) Remove the string from the hook. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 40 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Filter (CONT) Procedure Illustration 3) Pull out the filter. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 41 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Display Board Procedure Illustration 1) Remove 1 screw then remove the display box subassembly. Display board 2) Pry open the display light box. 3) Remove the display board and the humidity sensor module. Humidity sensor module...
  • Page 42 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Panel Frame Subassembly Procedure Illustration 1) Remove the 7 screws then remove the panel frame subassembly. Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
  • Page 43 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Upper Air Outlet Frame Assembly NOTE: Remove the front panel and panel frame subassembly before disassembling the upper air outlet frame assembly. Procedure Illustration 1) Remove 3 screws then remove the upper air outlet frame assembly.
  • Page 44 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Upper Air Outlet Frame Assembly (CONT) NOTE: Remove the panel before disassembling the electronic control box subassembly. Procedure Illustration 3) Remove the positive and negative ion generator by pulling upward, and pull out the positive and negative ion emitter.
  • Page 45 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Lower Air Outlet Frame Assembly NOTE: Remove the front panel and panel frame subassembly before disassembling the lower air outlet frame assembly. Procedure Illustration 1) Remove 3 screws then remove the lower air outlet frame assembly.
  • Page 46 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Evaporator NOTE: Remove the front panel, panel frame subassembly, upper air outlet frame assembly and lower air outlet frame assembly before disassembling the evaporator. Procedure Illustration 1) Remove 1 screw then remove the auxiliary water pan.
  • Page 47 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Fan and Fan Motor NOTE: Remove the evaporator subassembly before the disassembling fan. Procedure Illustration 1) Remove 1 screw and 1 hook, then remove the motor cover (there are two motor cover). 2) Pull out the fan motor and fan assembly from the side.
  • Page 48 40MBFAQ: Service Manual DISASSEMBLY INSTRUCTIONS (CONT) Electrical Parts (Anti-static gloves must be worn) NOTE: Remove the front panel and the panel frame subassembly before disassembling the electrical parts. Procedure Illustration 1) Remove 1 screw and remove the electronic control box cover.
  • Page 49: Appendices

    40MBFAQ: Service Manual APPENDICES Appendix 1 Table 12 — Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K) °C °F K OHM °C °F K OHM °C °F K OHM °C °F K OHM 115.266 12.6431 2.35774 0.62973...
  • Page 50 40MBFAQ: Service Manual Appendix 2 Table 13 — Temperature Sensor Resistance Value Table for TP (for some units) (°C--K) °C °F K OHM °C °F K OHM °C °F K OHM °C °F K OHM 542.7 68.66 13.59 3.702 511.9 65.62...
  • Page 51 40MBFAQ: Service Manual Pressure on the Service Port Cooling Chart (R410A) Table 14 — Cooling Chart ODU(DB) °F(°C) (-17) (-15) (-9.44) (7.22) (23.89) (29.44) (35) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 75/63 (23.89/17.22) 80/67 (26.67/19.44) 90/73 (32.22/22.78) 70/59 (21.11/15) 0.64 0.65...
  • Page 52 580.2(4.0) 507.6(3.5) 435.1(3.0) 362.5(2.5) 290(2.0) 217.5(1.5) 145(1.0) 72.5(0.5) 0(0) © 2023 Carrier. All rights reserved. Edition Date: 10/23 Catalog No: SG-40MBFAQ-01 Replaces: NEW Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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