Carrier 38MHRB series Service Manual
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Carrier 38MHRB series Service Manual

Outdoor unit single zone ductless system
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38MHRB
Outdoor Unit Single Zone Ductless System
Sizes 09 to 24

TABLE OF CONTENTS

Safety CONSIDERATIONS

INTRODUCTION

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CLEARANCES
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WIRING DIAGRAMS
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DIAGNOSIS AND SOLUTION
DISASSEMBLY INSTRUCTIONS
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SAFETY CONSIDERATIONS

Installing, starting up, and servicing air−conditioning equipment
can be hazardous due to system 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 cleaning coils. All other operations should be performed by
trained service personnel.
When working on the equipment, observe 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
quenching cloth and fire extinguisher nearby when brazing. Use
care in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local building
codes and 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.
Service Manual
PAGE
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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
1
could result in personal injury or death. CAUTION is used to
identify unsafe practices which may result in minor personal injury
1
or product and property damage. NOTE is used to highlight
2
suggestions which will result in enhanced installation, reliability, or
3
operation.
5
8
!
9
9
ELECTRICAL SHOCK HAZARD
10
Failure to follow this warning could result in personal
11
injury or death.
17
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
18
position. There may be more than 1 disconnect switch.
19
Lock out and tag switch with a suitable warning label.
18
23
!
24
25
27
48
71
!
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 extended periods of system 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 outdoor units. Section 2 of this manual has
an appendix with data required to perform troubleshooting. Use the
Table of Contents to locate a desired topic.
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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  • Page 1 38MHRB Outdoor Unit Single Zone Ductless System Sizes 09 to 24 Service Manual These words are used with the safety−alert symbol. DANGER TABLE OF CONTENTS identifies the most serious hazards which will result in severe PAGE personal injury or death. WARNING signifies hazards which SAFETY CONSIDERATIONS .

  • Page 2: Model/Serial Number Nomenclatures

    MODEL/SERIAL NUMBER NOMENCLATURES Table 1—Unit Sizes SYSTEM TONS BTUh VOLTAGE - PHASE OUTDOOR MODEL 1.00 12,000 115-1 38MHRBC12AA1 Cooling Only 1.00 12,000 208/230-1 38MHRBC12AA3 1.50 18,000 208/230-1 38MHRBC18AA3 2.00 24,000 208/230-1 38MHRBC24AA3 1.00 12,000 115-1 38MHRBQ12AA1 0.75 9,000 208/230-1 38MHRBQ09AA3 Heat Pump 1.00 12,000...

  • Page 3: Specifications

    SPECIFICATIONS Table 2—Specifications (Cooling Only) Size System Outdoor Model 38MHRBC12AA1 38MHRBC12AA3 38MHRBC18AA3 38MHRBC24AA3 Voltage, Phase, Cycle V/Ph/Hz 115-1-60 208/230-1-60 208/230-1-60 208/230-1-60 Electrical MOCP - Fuse Rating Operating Cooling Outdoor DB °F (°C) 0~122 (-17~50) 0~122 (-17~50) 0~122 (-17~50) 0~122 (-17~50) Range Min - Max Total Piping Length...
  • Page 4 SPECIFICATIONS (CONT) Table 5—Specifications (Heat Pump) Size System Outdoor Model 38MHRBQ12AA1 38MHRBQ09AA3 38MHRBQ12AA3 38MHRBQ18AA3 38MHRBQ24AA3 Voltage, Phase, Cycle V/Ph/Hz 115-1-60 208/230-1-60 208/230-1-60 208/230-1-60 208/230-1-60 Electrical MOCP - Fuse Rating 0~ 122 0~ 122 0~ 122 0~ 122 0~ 122 Cooling Outdoor DB Min - Max °...

  • Page 5: Dimensions

    DIMENSIONS Table 8—Dimensions System Size Height (H) in. (mm) Width (W) in. (mm) Depth (D) in. (mm) Weight-Net lbs. (kg) (115V) 21.85(555) 30.31(770) 11.81(300) 57.8(26.2) Cooling (208/230V) 21.85(555) 30.31(770) 11.81(300) 53.8(24.4) Only (208/230V) 21.85 (555) 30.31 (770) 11.81 (300) 65.9 (29.9) (208/230V) 27.64(702) 33.27(845)
  • Page 6 DIMENSIONS − OUTDOOR (CONT) 20.24 (514) 13.11 (333) 31.50 (800) 2.76 (7 0) 2.43 (6 1.8) 0.87 (2 2) 2.43 (6 1.6) Unit: inch(mm) Fig. 2 – Size 18K Heat Pump...
  • Page 7 DIMENSIONS − OUTDOOR (CONT) Unit: inch (mm) Fig. 3 – Size 24K...

  • Page 8: Clearances

    CLEARANCES Air-inlet Air-outlet Fig. 4 – Outdoor Unit Clearance Table 9—Clearances UNIT MINIMUM VALUE in. (mm) 24 (610) 24 (610) 24 (610) 4 (101) 4 (101) NOTE: The outdoor unit must be mounted at least 2in. (50mm) above the maximum anticipated snow depth. Fig.

  • Page 9: Electrical Data

    ELECTRICAL DATA Table 10—Electrical Data (Cooling Only) Outdoor Unit Size Volts-PH-Hz (115V) (208/230V) (208/230V) (208/230V) Cooling Only Max – Min* 127-104 253-187 253-187 253-187 Oper. Voltage Power Supply MOCP Compressor Outdoor Fan Motor Rated HP 0.054 0.054 0.054 0.068 Output Table 11—Electrical Data (Heat Pump) Outdoor Unit Size Volts-PH-Hz...

  • Page 10: Connection Diagrams

    CONNECTION DIAGRAMS 208/230-1-60 115-1-60 FIELD POWER SUPPLY CONNECTING CABLE FIELD POWER SUPPLY CONNECTING CABLE OUTDOOR TO INDOOR OUTDOOR TO INDOOR L1 L2 L1 L2 Main Power to Indoor Indoor Indoor Power to Main Indoor Unit Power Supply Indoor Unit Signal Indoor Indoor Unit Signal...

  • Page 11: Wiring Diagrams

    WIRING DIAGRAMS (COOLING ONLY) Fig. 7 – Wiring Diagram Size − Cooling Only Size 12K (115V)
  • Page 12 WIRING DIAGRAMS (COOLING ONLY (CONTINUED)) Fig. 8 – Wiring Diagram Cooling Only Size 12K (230V)
  • Page 13 WIRING DIAGRAMS (COOLING ONLY (CONTINUED)) Fig. 9 – Wiring Diagram Cooling Only Sizes 18−24K...
  • Page 14 WIRING DIAGRAMS (HEAT PUMP) Fig. 10 – Wiring Diagram Heat Pump Size 12K (115V)
  • Page 15 WIRING DIAGRAMS (HEAT PUMP (CONTINUED)) Fig. 11 – Wiring Diagram Heat Pump Sizes 09, 12, 18 (230V)
  • Page 16 WIRING DIAGRAMS (HEAT PUMP (CONTINUED)) Fig. 12 – Wiring Diagram Heat Pump Size 24 (230V)

  • Page 17: Refrigeration Cycle Diagrams

    REFRIGERATION CYCLE DIAGRAMS INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2−WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) T1 Room temp. sensor T2 Evaporator temp. sensor GAS SIDE 4−WAY VALVE 3−WAY VALVE ACCUMULATOR COOLING COMPRESSOR HEATING Fig.

  • Page 18: Refrigerant Lines

    REFRIGERANT LINES General Refrigerant Line Sizing 1 The outdoor units are shipped with a full charge of R410A 4 Both lines must be insulated. Use a minimum of 1/2in. refrigerant. All charges, line sizing, and capacities are based (12.7 mm) thick insulation. Closed−cell insulation is on runs of 25ft.

  • Page 19: System Evacuation And Charging

    Deep Vacuum Method SYSTEM EVACUATION AND The deep vacuum method requires a vacuum pump capable of CHARGING pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum method CAUTION is the most positive way of assuring a system is free of air and liquid water (see Fig.
  • Page 20 Operation Modes and Functions FAN Mode 1 Outdoor fan and compressor stop 2 Temperature setting function is disabled, and no setting temperature is displayed. 3 Indoor fan can be set to high/med/low/auto 4 The louver operates the same in the COOLING mode. 5 Auto fan Fig.
  • Page 21 Auto Fan Action in HEATING Mode Table 13—Auto Mode ΔT=T1-Ts Running mode ΔT＞2 Cooling -2≤ΔT≤2 Fan-only ΔT<-2 Heating The indoor fan runs under auto fan in the relevant mode. The louver operates the same in the relevant mode. If the machine switches modes between HEATING and COOLING, the compressor stops for 15 minutes and then chooses the mode according to T1−Ts.
  • Page 22 Point Check Function Press the remote controller’s LED DISPLAY or LED or MUTE button three times, and then press the AIR DIRECTION or SWING button three times in ten seconds, the buzzer rings for two seconds. The air conditioner enters into the information enquiry status. Press the LED DISPLAY or AIR DIRECTION button to check the next or front item’s information.

  • Page 23: Troubleshooting

    TROUBLESHOOTING Safety Electricity power is kept in capacitors even if the power supply is shut off. NOTE: Remember to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) Fig. 25 – Electrolytic Capacitors Ω For other models, please connect discharge resistance (approximately 100 40W) or a soldering iron (plug) between the +, −...

  • Page 24: Outdoor Unit Diagnostic Guides

    OUTDOOR UNIT DIAGNOSTIC GUIDES Table 16—Diagnostic Guides OPERATION LAMP TIMER LAMP DISPLAY LED STATUS ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆ Zero-crossing signal detection error 3 times ☆ 4 times Indoor fan speed has been out of control ☆...

  • Page 25: Pcb Diagrams

    PCB DIAGRAMS connect to PFC Capacitor when is on, 100−130V AC output connect to reactor when is on, 100−130V AC output US− KFR− 35W/BP3N1− (115V+RX62T+41560).D.13.WP2− 1 CN4_1 CN4_2 CN4_3 C N4_4 connect to Ground bridge REACTOR connect to N−line DSA1 (100−130VAC INPUT) connect to L−line (100−130VAC INPUT)
  • Page 26 PCB DIAGRAMS (CONT) Fig. 29 – Sizes 18−24 208−230V NOTE: After power on, LED3(Green color) and LED2(Red color) will flash if the unit has some problems. Table 17—LED Codes LED3 LED2 Problems IU display (Green) (Red) standby for normal Operation normally ☆...

  • Page 27: Diagnosis And Solution

    DIAGNOSIS AND SOLUTION EEPROM Parameter Error Diagnosis and Solution (E0/F4) Error Code E0/F4 Malfunction decision conditions Indoor or outdoor PCB main chip does not receive feedback from the EEPROM chip. Installation mistake Supposed causes PCB faulty Troubleshooting Power off, then restart the unit 2 minutes later.
  • Page 28 DIAGNOSIS AND SOLUTION (CONT) Indoor / outdoor unit’s communication diagnosis and solution (E1) Error Code Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition Malfunction Decision Conditions happens four times continuously. Wiring mistake Supposed Causes Indoor or outdoor PCB faulty Troubleshooting...
  • Page 29 DIAGNOSIS AND SOLUTION (CONT) Fig. 32 – Test the DC Voltage Use a multimeter to test the DC voltage between L2 port and S port of the outdoor unit. The red pin of the multimeter connects with the L2 port while the black pin is for the S port. When air conditioner is running normal, the voltage moves alternately between −50V to 50V. If the outdoor unit has a malfunction, the voltage will move alternately with positive value.
  • Page 30 DIAGNOSIS AND SOLUTION (CONT) Zero crossing detection error diagnosis and solution (E2) Error Code When the PCB does not receive a zero crossing signal feedback for 4 minutes or the zero crossing Malfunction decision conditions signal time interval is abnormal. Connection mistake Supposed causes PCB faulty...
  • Page 31 DIAGNOSIS AND SOLUTION (CONT) Fan speed has been out of control diagnosis and solution (E3/F5) Error Code E3/F5 When indoor fan speed remains too low (300RPM) for certain time, the unit stops and the LED Malfunction decision conditions displays the failure. Wiring mistake Fan assembly faulty Supposed causes...
  • Page 32 DIAGNOSIS AND SOLUTION (CONT) Index 1 1 Indoor or Outdoor DC Fan Motor (control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1−pin3, pin4−pin3 in fan motor connector. If the voltage value is not in the range shown in Table 18 or Table 19, the PCB has an issue and needs to be replaced.
  • Page 33 DIAGNOSIS AND SOLUTION (CONT) Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3) Error Code E4/E5/F1/F2/F3 Malfunction decision conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure. Wiring mistake Supposed causes Sensor faulty PCB faulty...
  • Page 34 DIAGNOSIS AND SOLUTION (CONT) Refrigerant Leakage Detection diagnosis and solution (EC) Error Code Define the evaporator coil temp.T2 of the compressor. It starts running in Tcool. At first, 5 minutes after the compressor starts up, if T2 ＜Tcool－35.6 F (Tcool－2 C) does not Malfunction decision conditions run for 4 seconds and this situation occurs 3 times, the display area displays“EC”and the air...
  • Page 35 DIAGNOSIS AND SOLUTION (CONT) Overload current protection diagnosis and solution (F0) Error Code Malfunction decision conditions An abnormal current rise is detected by checking the specified current detection circuit. Power supply problems System blockage Supposed causes PCB faulty Wiring mistake Compressor malfunction Troubleshooting Stop the unit...
  • Page 36 DIAGNOSIS AND SOLUTION (CONT) IPM malfunction or IGBT over−strong current protection diagnosis and solution (P0) Error Code When the voltage signal, that the IPM sends to the compressor drive chip is abnormal, the display Malfunction decision conditions LED displays P0”and the air conditioner turns off. Wiring mistake IPM malfunction Supposed causes...
  • Page 37 DIAGNOSIS AND SOLUTION (CONT) Fig. 36 – P−U Fig. 37 – P−V...
  • Page 38 DIAGNOSIS AND SOLUTION (CONT) Fig. 38 – P−W Fig. 39 – N−U...
  • Page 39 DIAGNOSIS AND SOLUTION (CONT) Fig. 40 – N−V Fig. 41 – N−W...
  • Page 40 DIAGNOSIS AND SOLUTION (CONT) Over voltage or too low voltage protection diagnosis and solution (P1) Error Code Malfunction decision conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. Power supply problems Supposed causes System leakage or block PCB faulty Troubleshooting...
  • Page 41 DIAGNOSIS AND SOLUTION (CONT) High temperature protection of compressor top diagnosis and solution (P2) Error Code Malfunction decision conditions If the sampling voltage is not 5V, the LED displays the failure. Power supply problems Supposed causes System leakage or block PCB faulty Troubleshooting Check if the Fastening screws...
  • Page 42 DIAGNOSIS AND SOLUTION (CONT) Inverter compressor drive error diagnosis and solution (P4) Error Code An abnormal inverter compressor drive is detected by a special detection circuit, including Malfunction decision conditions communication signal detection, voltage detection, compressor rotation speed signal detection, etc. Wiring mistake IPM malfunction Supposed causes...
  • Page 43 DIAGNOSIS AND SOLUTION (CONT) Main Parts Check Temperature Sensor Checking Disconnect the temperature sensor from the PCB, measure the resistance value with a tester. Fig. 43 – 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 44 DIAGNOSIS AND SOLUTION (CONT) Compressor Checking Measure the resistance value of each winding by using the tester. Fig. 44 – Tester Table 20—Compressor Checking Position Resistance Value ASN98D22UFZ ASM135D23UFZ ATF235D22UMT ATF250D22UMT Blue - Red 1.57Ω 1.75 Ω 0.75 Ω 0.75 Ω Blue - Black Red - Blue Fig.
  • Page 45 DIAGNOSIS AND SOLUTION (CONT) IPM Continuity Check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Table 21—IPM Continuity Check Digital Tester Normal Resistance Value Digital Tester...
  • Page 46 Pressure on Service Port Table 23—Cooling Chart °F °C (23.89) (29.44) (35) (40.56) (46.11) 70/59 10.1 75/63 10.7 80/67 11.2 °F °C (23.89) (29.44) (35) (40.56) (46.11) 70/59 75/63 80/67 °F °C (23.89) (29.44) (35) (40.56) (46.11) 70/59 0.82 0.78 0.81 0.86 1.01...
  • Page 47 Pressure on Service Port (Cont) Table 24—Heating Chart 57/53 47/43 37/33 27/23 17/13 °F °C (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) (-8.33/-10.56) 30.3 28.5 25.3 22.8 20.8 32.5 30.0 26.6 25.4 23.3 33.8 31.5 27.8 26.3 24.9 57/53 47/43 37/33 27/23 17/13 °F °C (13.89/11.67)

  • Page 48: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) Panel plate How to remove the panel plate. Top panel screws (3), 1 screws is under the big handle 1. Stop the air conditioner and turn “OFF” the Big handle power breaker. (3 screws) 2. Remove the big handle first, and then remove the top cover (3 screws).
  • Page 49 DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) How to remove the fan assembly assembly. 1) Remove the nut securing the fan, and remove the fan. 2) After removing the top cover, release the hooks and open the electronic control box cover. Disconnect the fan motor connector from the electronic control...
  • Page 50 DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) 4) Remove the fan motor screws (4) then remove the motor.
  • Page 51 DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) Electrical How to remove the parts electrical parts. 1) After you complete the steps in item 1 and 2, remove the compressor connector. 2) Pull out the two blue wires connected to the four way valve. 3) Pull out connectors of the condenser coil temp.
  • Page 52 DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) 4) Disconnect the electronic expansion valve wire from the control board. 5) Remove the ground wires. 6) Remove the wires (1,2,3). 7) Remove the electronic control box.
  • Page 53 DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) Four-way How to remove the valve four-way valve. The picture of four-way valve may be different from your actual valve. 1) Perform the work of sections 1 and 3. 2) Recover refrigerant from the refrigerant circuit.
  • Page 54 DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) Part name Procedures Remarks Panel plate How to remove the panel plate. Top panel screws (3 screws, 1 screw is under the big handle) 1) Stop the air conditioner and turn “OFF” the power breaker. Handler screws (3) Front panel screws (6) 2) Remove the big handle...
  • Page 55 DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) (CONT) How to remove the fan assembly assembly. 1) After removing the panel plate using section 1, remove the hex nut securing the fan then remove the fan. 2) Release the hooks and open the Compressor T3, T4, T5 sensor electronic control box...
  • Page 56 DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) (CONT) 3) Disconnect the fan motor connector and from the electronic control board. 4) Remove the fan motor screws (4). Then remove the fan motor. Electrical How to remove the parts electrical parts. 1) After completing the work in sections 1 and 2, remove the compressor...
  • Page 57 DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) (CONT) 3) Pull out connectors of the condenser coil temp. sensor (T3),outdoor ambient temp. sensor (T4) and discharge temp. sensor (T5). 4) Disconnect the electronic expansion valve wire. 5) Remove the grounding screw. 6) Remove the wires (1, 2, 3).
  • Page 58 DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) (CONT) Four-way How to remove the valve four-way valve. The picture of four-way valve may differ from your 1) Complete the steps in actual valve. sections 1, 3. 2) Recover refrigerant from the refrigerant circuit. 3) Remove the coil screw then remove the coil.
  • Page 59 DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) Part name Procedures Remarks Panel plate How to remove the panel plate. 1) Stop the air conditioner and turn Top panel screws (3) the power breaker. Big handle screws (3) Front panel screws (9) 2) Remove the top panel screws (3).
  • Page 60 DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) (CONT) How to remove the fan assembly assembly. 1) After removing the panel plate using section 1, remove the hex nut securing the fan then remove the fan. 2) After removing the top cover, release the hooks then open the electronic control box cover.
  • Page 61 DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) (CONT) Disconnect the connector for fan motor from the electronic control board. Remove the fan motor screws. Then remove the fan motor. Electrical How to remove the parts electrical parts. 1) Complete the work of items 1 and 2, then remove the compressor and...
  • Page 62 DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) (CONT) 2) Pull out the two blue wires connected to the four way valve. 3) Remove the connectors of the condenser coil temp. sensor (T3),outdoor ambient temp. sensor (T4) and discharge temp. sensor (T5). 4) Disconnect the electronic expansion valve wire.
  • Page 63 DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) (CONT) 5) Remove the electric heaters. 6) Remove the grounding screw. 7) Remove the wires (1, 2, 3 or L1, L2, S). Then remove the electronic control box.
  • Page 64 DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) (CONT) Four-way How to remove the valve four-way valve. The picture of four-way valve may differ from your 1) Complete the steps in actual valve. sections 1, 3. 2) Recover refrigerant from the refrigerant circuit. 3) Remove the coil screw then remove the coil.
  • Page 65 DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) Part name Procedures Remarks Panel plate How to remove the panel Big handle screws (4) plate. 1) Stop the air Top panel screws (3), 1 screw is under the big handle) conditioner and turn “OFF” the power breaker.
  • Page 66 DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) How to remove the fan assembly assembly. Electronic control box 1) Remove the panel plate using the steps in section 1. 2) Remove the nut securing the fan, then remove the fan. Compressor 3) Release the hooks and remove the screws.
  • Page 67 DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) Compressor Pressure switch T3, T4, T5, sensor wire 4) Disconnect the fan motor connector from the electronic control board. 5) Remove the fan motor screws (4) of the fan Motor wire Electronic expansion 4 way valve motor, then remove the motor.
  • Page 68 DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) Electrical How to remove the parts electrical parts. 1) After completing the work in sections 1 and 2, remove the compressor connector. 2) Pull out the two blue 3) wires connected with the four way valve. 4) Pull out connectors of the condenser coil temp.
  • Page 69 DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) 5) Disconnect the pressure switch connector. 6) Disconnect the electronic expansion valve wire from the control board. 7) Remove the ground wires. 8) Remove the wires (1, 2, 3 or L1, L2, S). Then remove the electronic control box.
  • Page 70 DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) Four-way How to remove the valve four-way valve. The picture of four-way valve may differ from your 1) Complete the steps in actual valve. sections 1, 3. 2) Recover the refrigerant from the refrigerant circuit.

  • Page 71: Appendix

    APPENDIX Appendix 1 Table 25—Temperature Sensor Resistance Value Table for T1, T2, T3, T4 °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423...
  • Page 72 Appendix 2 Table 26—Temperature Sensor Resistance Value Table for T5 °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 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5 57.37...
  • Page 73 Appendix 3 Table 27—Celsius to Fahrenheit °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 129.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8 188.6 244.4 32.9 78.8...
  • Page 74 Copyright 2018 CAC/BDP . S 7310 W. Morris St. S Indianapolis, IN 46231 Edition Date: 08/18 Catalog No. SG-38MHRB-01 Replaces: NEW Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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