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Table Of Contents

Service Manual

38MHRB

Outdoor Unit Single Zone Ductless System

Sizes 09 to 24

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS 1.........................

INTRODUCTION 1...................................

MODEL/SERIAL NUMBER NOMENCLATURES 2.........

SPECIFICATIONS 3...................................

DIMENSIONS 5.....................................

CLEARANCES 8.....................................

ELECTRICAL DATA 9................................

WIRING 9...........................................

CONNECTION DIAGRAMS 10.........................

WIRING DIAGRAMS 11...............................

REFRIGERATION CYCLE DIAGRAMS 17................

REFRIGERANT LINES 18.............................

SYSTEM EVACUATION AND CHARGING 19.............

ELECTRONIC FUNCTIONS 18.........................

TROUBLESHOOTING 23..............................

OUTDOOR UNIT DIAGNOSTIC GUIDES 24..............

PCB DIAGRAMS 25..................................

DIAGNOSIS AND SOLUTION 27.......................

DISASSEMBLY INSTRUCTIONS 48.....................

APPENDIX 71.......................................

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.

These words are used with the safety−alert symbol. DANGER

identifies the most serious hazards which will result in severe

personal injury or death. WARNING signifies hazards which

could result in personal injury or death. CAUTION is used to

identify unsafe practices which may result in minor personal injury

or product and property damage. NOTE is used to highlight

suggestions which will result in enhanced installation, reliability, or

operation.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Before installing, modifying, or servicing system, 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.

EXPLOSION HAZARD

Failure to follow this warning could

result in death, serious personal injury,

and/or property damage.

Never use air or gases containing

oxygen for leak testing or operating

refrigerant compressors. Pressurized

mixtures of air or gases containing

oxygen can lead to an explosion.

WARNING

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 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.

Summary of content (74 pages)

PAGE 1
38MHRB Outdoor Unit Single Zone Ductless System Sizes 09 to 24 Service Manual TABLE OF CONTENTS PAGE SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 MODEL/SERIAL NUMBER NOMENCLATURES . . . . . . . . . 2 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 CLEARANCES . . . . . .
PAGE 2
MODEL/SERIAL NUMBER NOMENCLATURES Table 1—Unit Sizes SYSTEM TONS BTUh VOLTAGE - PHASE OUTDOOR MODEL 1.00 12,000 115-1 38MHRBC12AA1 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 1.00 12,000 208/230-1 38MHRBQ12AA3 1.50 18,000 208/230-1 38MHRBQ18AA3 2.
PAGE 3
SPECIFICATIONS Table 2—Specifications (Cooling Only) Size Outdoor Model Voltage, Phase, Cycle MCA MOCP - Fuse Rating Cooling Outdoor DB Min - Max Total Piping Length Piping Lift* Pipe Connection Size - Liquid Pipe Connection Size - Suction Type Charge Metering Device Face Area No.
PAGE 4
SPECIFICATIONS (CONT) Table 5—Specifications (Heat Pump) Size Outdoor Model Voltage, Phase, Cycle MCA MOCP - Fuse Rating V/Ph/Hz A. A. Cooling Outdoor DB Min - Max ° F (° C) Heating Outdoor DB Min - Max ° F (° C) Total Piping Length Piping Lift* Pipe Connection Size - Liquid Pipe Connection Size - Suction Type Refrigerant Charge Metering Device Face Area No.
PAGE 5
DIMENSIONS Table 8—Dimensions System Size Width (W) in. (mm) Depth (D) in. (mm) Weight-Net lbs. (kg) 12K (115V) 21.85(555) 30.31(770) 11.81(300) 57.8(26.2) 12K (208/230V) 21.85(555) 30.31(770) 11.81(300) 53.8(24.4) 18K (208/230V) 21.85 (555) 30.31 (770) 11.81 (300) 65.9 (29.9) 24K (208/230V) System Size 33.27(845) 14.29(363) 88.6(40.2) Width (W) in. (mm) Depth (D) in. (mm) Weight-Net lbs. (kg) 69(31.3) 12K (115V) 21.85(555) 30.31(770) 11.81(300) 9K (208/230V) 21.
PAGE 6
H 0.47 (1 2) 21.81 (554) DIMENSIONS − OUTDOOR (CONT) 20.24 (514) 13.11 (333) D W1 31.50 (800) 2.76 (7 0) W2 2.43 (6 1.8) B1 D3 H1 R0 3.37 (8 5.5) B2 13.39 (340) D2 12.24 (311) 12.80 (325) 2.36 (6 0) 4.17 (1 06) W . 79 (R 2 0) 0.87 (2 2) A1 R 0. 24 ( R 6) H2 2.43 (6 1.6) A2 Fig.
PAGE 7
DIMENSIONS − OUTDOOR (CONT) Unit: inch (mm) Fig.
PAGE 8
CLEARANCES A Air-inlet E D B C Air-outlet Fig. 4 – Outdoor Unit Clearance Table 9—Clearances UNIT A MINIMUM VALUE in. (mm) 24 (610) B 24 (610) C 24 (610) D 4 (101) E 4 (101) NOTE: The outdoor unit must be mounted at least 2in. (50mm) above the maximum anticipated snow depth. 9.
PAGE 9
ELECTRICAL DATA Table 10—Electrical Data (Cooling Only) Cooling Only Power Supply Compressor Outdoor Fan Motor Outdoor Unit Size 12K 12K 18K 24K Volts-PH-Hz (115V) (208/230V) (208/230V) (208/230V) Max – Min* Oper. Voltage 127-104 253-187 253-187 253-187 MCA 13 11 15 18 MOCP 20 15 20 25 RLA 9.5 6.8 9 12 FLA 0.6 0.5 0.6 0.6 Rated HP 0.054 0.054 0.054 0.
PAGE 10
CONNECTION DIAGRAMS CONNECTING CABLE OUTDOOR TO INDOOR 115-1-60 FIELD POWER SUPPLY CONNECTING CABLE OUTDOOR TO INDOOR 208/230-1-60 FIELD POWER SUPPLY GND GND L N S Indoor Unit Indoor Power Supply Signal High 115-1-60 Voltage GND Ground 115V Indoor Unit L N L N S Power to Indoor Main Indoor Unit Signal Power Supply High 115-1-60 Voltage 115-1-60 L1 L2 S Indoor Unit Indoor Power Supply Signal High 208/230-1-60 Voltage 115V Outdoor Unit GND Ground 230V Indoor Unit L1 L2 L1 L2 S Main Power to Ind
PAGE 11
WIRING DIAGRAMS (COOLING ONLY) Fig.
PAGE 12
WIRING DIAGRAMS (COOLING ONLY (CONTINUED)) Fig.
PAGE 13
WIRING DIAGRAMS (COOLING ONLY (CONTINUED)) Fig.
PAGE 14
WIRING DIAGRAMS (HEAT PUMP) Fig.
PAGE 15
WIRING DIAGRAMS (HEAT PUMP (CONTINUED)) Fig.
PAGE 16
WIRING DIAGRAMS (HEAT PUMP (CONTINUED)) Fig.
PAGE 17
REFRIGERATION CYCLE DIAGRAMS INDOOR OUTDOOR CHECK VALVE (Heating Model only) LIQUID SIDE 2−WAY VALVE CAPILIARY TUBE HEAT EXCHANGE (EVAPORATOR) HEAT EXCHANGE (CONDENSER) T1 Room temp. sensor T2 Evaporator temp. sensor GAS SIDE 4−WAY VALVE 3−WAY VALVE ACCUMULATOR COOLING COMPRESSOR Fig.
PAGE 18
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 25ft. (7.6 m). For runs over 25 ft. (7.6 m), consult the long−line applications section for the proper charge adjustments. 2 The 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.
PAGE 19
SYSTEM EVACUATION AND CHARGING ! CAUTION Deep Vacuum Method 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 assuring a system is free of air and liquid water (see Fig. 16). UNIT DAMAGE HAZARD MICRONS Failure to follow this caution may result in equipment damage or improper operation. Never use the system compressor as a vacuum pump.
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. 20 – Auto Fan Fig. 18 – Auto Fan COOLING Mode Compressor Running Rules: S S When T1*Ts < 28.4_F(*2_C), the compressor stops. S When the AC runs in the mute mode, the compressor runs with low frequency.
PAGE 21
Table 13—Auto Mode Auto Fan Action in HEATING Mode ΔT=T1-Ts ΔT＞2_C -2≤ΔT≤2_C ΔT<-2_C T1 a b c d e Fig. 23 – Auto Fan Action in HEATING Mode DEFROST Mode The air conditioner enters the DEFROST mode according to the T3 temperature value and the T3 temperature change value range plus the compressor running time. During the DEFROST mode, the compressor continues to runs, the indoor and outdoor motors stop, and the indoor unit defrost appears.
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. When the air conditioner enters the information enquiry status, it displays the code name in 2 seconds (see Table 14).
PAGE 23
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 For other models, please connect discharge resistance (approximately 100Ω 40W) or a soldering iron (plug) between the +, − terminals of the electrolytic capacitor on the contrary side of the outdoor PCB. Fig. 26 – Discharge Position NOTE: Fig.
PAGE 24
OUTDOOR UNIT DIAGNOSTIC GUIDES Table 16—Diagnostic Guides OPERATION LAMP TIMER LAMP DISPLAY ☆1 time ☆ 2 times ☆ 3 times ☆ 4 times ☆ 5 times ☆ 6 times ☆ 7 times ☆ 1 time ☆ 2 times ☆ 3 times ☆ 4 times ☆ 5 times ☆ 6 times ☆ 1 time ☆ 2 times ☆ 3 times ☆ 4 times ☆ 5 times ☆ 6 times X E0 LED STATUS Indoor unit EEPROM parameter error X E1 Indoor / outdoor units communication error X E2 Zero-crossing signal detection error X E3 Indoor fan speed has been out of control X E4 Indoor room temperature
PAGE 25
PCB DIAGRAMS connect to PFC Capacitor when is on, 100−130V AC output Earth connect to reactor when is on, 100−130V AC output US− KFR− 35W/BP3N1− (115V+RX62T+41560).D.13.
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.
PAGE 27
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. Supposed causes S S Installation mistake PCB faulty Troubleshooting Power off, then restart the unit 2 minutes later. Yes Replace the indoor/outdoor main PCB. EEPROM: A read−only memory whose contents can be erased and reprogrammed using a pulsed voltage.
PAGE 28
DIAGNOSIS AND SOLUTION (CONT) Indoor / outdoor unit’s communication diagnosis and solution (E1) Error Code E1 Malfunction Decision Conditions Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens four times continuously. S S Supposed Causes Wiring mistake Indoor or outdoor PCB faulty Troubleshooting Power off, then restart the unit 2 minutes later Yes Measure Vs., is it a positive fluctuation? (Vs represents the voltage S and N of the outdoor unit.
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. If the indoor unit has malfunction, the voltage will have a certain value. Fig.
PAGE 30
DIAGNOSIS AND SOLUTION (CONT) Zero crossing detection error diagnosis and solution (E2) Error Code E2 Malfunction decision conditions When the PCB does not receive a zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. S S Supposed causes Connection mistake PCB faulty Troubleshooting Check if the connections and power supply are normal. Correct the connections. Turn on the unit when the power supply is good. No Yes Indoor main PCB is defective.
PAGE 31
DIAGNOSIS AND SOLUTION (CONT) Fan speed has been out of control diagnosis and solution (E3/F5) Error Code E3/F5 Malfunction decision conditions When indoor fan speed remains too low (300RPM) for certain time, the unit stops and the LED displays the failure. S S S S Supposed causes Wiring mistake Fan assembly faulty Fan motor faulty PCB faulty Troubleshooting Power off, then restart the unit 2 minutes later No The unit operates normally. No Find the cause and resolve it.
PAGE 32
DIAGNOSIS AND SOLUTION (CONT) Index 1 1 Indoor or Outdoor DC Fan Motor (control chip is in fan motor) S 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. Fig. 34 – Motor Connector Table 18—DC motor voltage input and output (voltage: 220−240V~) NO.
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. S S S Supposed causes Wiring mistake Sensor faulty PCB faulty Troubleshooting Check the connection between the temperature sensor and PCB.
PAGE 34
DIAGNOSIS AND SOLUTION (CONT) Refrigerant Leakage Detection diagnosis and solution (EC) Error Code EC Malfunction decision conditions 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 run for 4 seconds and this situation occurs 3 times, the display area displays“EC”and the air conditioner will turn off.
PAGE 35
DIAGNOSIS AND SOLUTION (CONT) Overload current protection diagnosis and solution (F0) Error Code F0 Malfunction decision conditions An abnormal current rise is detected by checking the specified current detection circuit. S S S S S Supposed causes Power supply problems System blockage PCB faulty Wiring mistake Compressor malfunction Troubleshooting Check the power supply No Stop the unit No Clear the blockage No Replace the compressor No Correct the connections or replace the wires.
PAGE 36
DIAGNOSIS AND SOLUTION (CONT) IPM malfunction or IGBT over−strong current protection diagnosis and solution (P0) Error Code P0 Malfunction decision conditions When the voltage signal, that the IPM sends to the compressor drive chip is abnormal, the display LED displays P0”and the air conditioner turns off.
PAGE 37
DIAGNOSIS AND SOLUTION (CONT) Fig. 36 – P−U Fig.
PAGE 38
DIAGNOSIS AND SOLUTION (CONT) Fig. 38 – P−W Fig.
PAGE 39
DIAGNOSIS AND SOLUTION (CONT) Fig. 40 – N−V Fig.
PAGE 40
DIAGNOSIS AND SOLUTION (CONT) Over voltage or too low voltage protection diagnosis and solution (P1) Error Code P1 Malfunction decision conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. S S S Supposed causes Power supply problems System leakage or block PCB faulty Troubleshooting Check the power supply No Stop the unit No Correct the connections or replace the wires.
PAGE 41
DIAGNOSIS AND SOLUTION (CONT) High temperature protection of compressor top diagnosis and solution (P2) Error Code P2 Malfunction decision conditions If the sampling voltage is not 5V, the LED displays the failure. S S S Supposed causes Power supply problems System leakage or block PCB faulty Troubleshooting Check if the Fastening screws on the PCB and IPM radiator are fixed tightly. Yes No Tighten the screws and apply silicon grease. Replace the outdoor control PCB.
PAGE 42
DIAGNOSIS AND SOLUTION (CONT) Inverter compressor drive error diagnosis and solution (P4) Error Code P4 Malfunction decision conditions An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection, etc.
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. Measure the resistance value of each winding by using the multi−meter.
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 ASN98D22UFZ Resistance Value ASM135D23UFZ ATF235D22UMT ATF250D22UMT Blue - Red Blue - Black 1.57Ω 1.75 Ω 0.75 Ω Red - Blue Fig. 45 – Compressor Checking 44 0.
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.
PAGE 46
Pressure on Service Port Table 23—Cooling Chart °F (°C ) ODT IDT BAR BAR BAR °F (°C ) 70/59 75/63 80/67 ODT IDT PSI PSI PSI °F (°C ) MPA MPA MPA 70/59 75/63 80/67 ODT IDT 70/59 75/63 80/67 75 (23.89) 85 (29.44) 95 (35) 105 (40.56) 115 (46.11) 8.2 8.6 9.3 7.8 8.3 8.9 8.1 8.7 9.1 8.6 9.1 9.6 10.1 10.7 11.2 75 (23.89) 85 (29.44) 95 (35) 105 (40.56) 115 (46.11) 119 124 135 113 120 129 117 126 132 125 132 140 147 155 162 75 (23.89) 85 (29.44) 95 (35) 105 (40.56) 115 (46.11) 0.
PAGE 47
Pressure on Service Port (Cont) Table 24—Heating Chart °F (°C ) ODT IDT BAR BAR BAR °F (°C ) 55 65 75 ODT IDT PSI PSI PSI °F (°C ) MPA MPA MPA 55 65 75 ODT IDT 55 65 75 57/53 (13.89/11.67) 47/43 (8.33/6.11) 37/33 (2.78/0.56) 27/23 (-2.78/-5) 17/13 (-8.33/-10.56) 30.3 32.5 33.8 28.5 30.0 31.5 25.3 26.6 27.8 22.8 25.4 26.3 20.8 23.3 24.9 57/53 (13.89/11.67) 47/43 (8.33/6.11) 37/33 (2.78/0.56) 27/23 (-2.78/-5) 17/13 (-8.33/-10.
PAGE 48
DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) 1 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 power breaker. Big handle (3 screws) 2. Remove the big handle first, and then remove the top cover (3 screws). 3. Remove the front panel screws (7). Front panel screws (7) 2 ƻ 4. Remove the right side panel screws (11).
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DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) 2 Fan assembly How to remove the fan assembly. 2 ƻ 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. 3 ƻ 3) Disconnect the fan motor connector from the electronic control board.
PAGE 50
DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) ĺ 4) Remove the fan motor screws (4) then remove the motor.
PAGE 51
DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) 3 Electrical parts How to remove the 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. sensor (T3), outdoor ambient temp. sensor (T4) and discharge temp. sensor (T5).
PAGE 52
DISASSEMBLY INSTRUCTIONS SIZES 12K (115V) (CONT) 4) Disconnect the electronic expansion valve wire from the control board. ĺ 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) 4 Four-way valve How to remove the four-way valve. 1) Perform the work of sections 1 and 3. The picture of four-way valve may be different from your actual valve. ĺ 3 ƻ 2) Recover refrigerant from the refrigerant circuit. 3) Remove the coil screw then remove the coil. 4) Detach the welded parts of the four-way valve and pipe. 5) Remove the four-way valve assembly. 5 Compressor How to remove the compressor. 2 ƻ 1) Complete the work of sections1 and 3.
PAGE 54
DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) No. 1 Part name Procedures Panel plate How to remove the panel plate. 1) Stop the air conditioner Remarks Top panel screws (3 screws, 1 screw is under the big handle) and turn “OFF” the Big power breaker. Handler screws (3) Front panel screws (6) 2 ƻ 2) Remove the big handle first, then remove the 4 ƻ top panel (3 screws). 3) Remove the front 3 ƻ panel screws (6). 4) Remove the right side panel screws (8).
PAGE 55
DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) (CONT) 2 Fan assembly How to remove the fan assembly. 1 ƻ 1) After removing the panel plate using section 1, remove the hex nut securing the fan then remove the fan. 2 ƻ 2) Release the hooks and open the electronic control box Compressor T3, T4, T5 sensor cover.
PAGE 56
DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) (CONT) 3) Disconnect the fan 3 ƻ motor connector and from the electronic control board. 4 ƻ 4) Remove the fan motor screws (4). Then remove the fan motor. 3 Electrical parts How to remove the electrical parts. 1) After completing the work in sections 1 and 2, remove the compressor connectors. 1 ƻ 2 ƻ 2) Pull out the two blue wires connected with the four way valve.
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 4 ƻ valve wire. 5) Remove the grounding screw. 5 ƻ 6) Remove the wires (1, 2, 3). Then remove the electronic control box.
PAGE 58
DISASSEMBLY INSTRUCTIONS SIZES 12K (208−230V) (CONT) 4 5 Four-way valve How to remove the four-way valve. 1) Complete the steps in sections 1, 3. 2) Recover refrigerant from the refrigerant circuit. 3) Remove the coil screw then remove the coil. 4) Detach the welded parts of the four-way valve and pipe. 5) Remove the four-way valve assembly. Compressor How to remove the compressor. 1) Complete steps in sections 1, 3. 2) Recover refrigerant from the refrigerant circuit.
PAGE 59
DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) No. Part name Procedures 1 Panel plate How to remove the panel plate. 1) Remarks Stop the air conditioner and turn ĀOFFā the power breaker. Top panel screws (3) Big handle screws (3) Front panel screws (9) 2) Remove the top panel screws (3). 2 ƻ 3) Remove the front panel screws (9). 4 ƻ 4) Remove the right side panel screws (8).
PAGE 60
DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) (CONT) 2 Fan assembly How to remove the fan assembly. 1 ƻ 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) 3) 4) 3 Electrical parts Disconnect the connector for fan motor from the electronic control board. 3 ƻ Remove the fan motor screws. Then remove the fan motor. 4 ƻ How to remove the electrical parts. 1) Complete the work of items 1 and 2, then remove the compressor and reactor connectors.
PAGE 62
DISASSEMBLY INSTRUCTIONS SIZES 18K (208−230V) (CONT) 2) Pull out the two blue wires connected to the four way valve. 2 ƻ 3 ƻ 3 ƻ 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. 5 ƻ 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) 4 5 Four-way valve Compressor How to remove the four-way valve. 1) Complete the steps in sections 1, 3. 2) Recover refrigerant from the refrigerant circuit. 3) Remove the coil screw then remove the coil. 4) Detach the welded parts of four-way valve and pipe. 5) Remove the four-way valve assembly. The picture of four-way valve may differ from your actual valve. ĺ 3 ƻ How to remove the compressor.
PAGE 65
DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) No. Part name Procedures 1 Panel plate How to remove the panel plate. 1) Stop the air conditioner and turn “OFF” the power breaker. Remarks Big handle screws (4) Top panel screws (3), 1 screw is under the big handle) 2) Remove the big handle first, then remove the top cover (7 screws). Front panel screws (11) 3) Remove the front panel screws (11). 2 ƻ 4) Remove the right side panel screws (13).
PAGE 66
DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) 2 Fan assembly How to remove the fan assembly. Fan 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 2 ƻ 3) Release the hooks and remove the screws. Open the electronic control box cover.
PAGE 67
DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) Compressor T3, T4, T5, sensor Pressure switch 4) Disconnect the fan motor connector from the electronic control board. 5) Remove the fan motor screws (4) of the fan motor, then remove the motor.
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DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) 3 Electrical parts How to remove the electrical parts. 1) After completing the work in sections 1 and 2, remove the compressor connector. 1 ƻ 2) Pull out the two blue 3) wires connected with the four way valve. 2 ƻ 4) Pull out connectors of the condenser coil temp. sensor (T3), outdoor ambient temp. sensor (T4) and discharge temp. sensor (T5).
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DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) 5) Disconnect the pressure switch connector. 4 ƻ 6) Disconnect the electronic expansion valve wire from the control board. 5 ƻ 6 ƻ 7) Remove the ground wires. 8) Remove the wires (1, 2, 3 or L1, L2, S). Then remove the electronic control box.
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DISASSEMBLY INSTRUCTIONS SIZES 24K (208−230V) (CONT) 4 Four-way valve How to remove the four-way valve. 1) Complete the steps in sections 1, 3. 2) Recover the refrigerant from the refrigerant circuit. 3) Remove the coil screw and then remove the coil. 4) Detach the welded parts of four-way valve and pipe. 5) Remove the four-way valve assembly. The picture of four-way valve may differ from your actual valve. 3 ƻ 5 Compressor How to remove the compressor. 1) Complete steps in sections 1, 3.
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APPENDIX Appendix 1 Table 25—Temperature Sensor Resistance Value Table for T1, T2, T3, T4 °C -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 °F -4 -2 0 1 3 5 7 9 10 12 14 16 18 19 21 23 25 27 28 30 32 34 36 37 39 41 43 45 46 48 50 52 54 55 57 59 61 63 64 66 K Ohm 115.266 108.146 101.517 96.3423 89.5865 84.219 79.311 74.536 70.1698 66.0898 62.2756 58.7079 56.3694 52.2438 49.3161 46.5725 44 41.5878 39.8239 37.1988 35.2024 33.3269 31.
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Appendix 2 Table 26—Temperature Sensor Resistance Value Table for T5 °C -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 °F -4 -2 0 1 3 5 7 9 10 12 14 16 18 19 21 23 25 27 28 30 32 34 36 37 39 41 43 45 46 48 50 52 54 55 57 59 61 63 64 66 K Ohm 542.7 511.9 483 455.9 430.5 406.7 384.3 363.3 343.6 325.1 307.7 291.3 275.9 261.4 247.8 234.9 222.8 211.4 200.7 190.5 180.9 171.9 163.3 155.2 147.6 140.4 133.5 127.1 121 115.2 109.8 104.6 99.
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Appendix 3 Table 27—Celsius to Fahrenheit °C °F °C °F °C °F °C °F °C °F -5 23 21 69.8 51 123.8 82 179.6 113 235.4 -4 24.8 22 71.6 52 125.6 83 181.4 114 237.2 -3 26.6 23 73.4 53 127.4 84 183.2 115 239 -2 28.4 24 75.2 54 129.2 85 185 116 240.8 -1 30.2 25 77 55 131 86 186.8 117 242.6 0 0.5 1 32 32.9 33.8 25.5 26 27 77.9 78.8 80.6 56 57 58 132.8 134.6 136.4 87 88 89 188.6 190.4 192.2 118 119 120 244.4 246.2 248 1.5 34.7 28 82.4 59 138.
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Copyright 2018 CAC/BDP. S 7310 W. Morris St. S Indianapolis, IN 46231 Edition Date: 08/18 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. 74 Catalog No.