Mitsubishi Electric MUZ-RW25VGHZ-E1 Service Manual Download Page 34

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12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS

MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ

Part name

Check method and criterion

Figure

Defrost thermistor

(RT61)
Fin temperature

thermistor (RT64)
Ambient temperature

thermistor (RT65)
Outdoor heat exchanger

temperature thermistor

(RT68)

Measure the resistance with a tester.
Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C.

board”, for the chart of thermistor.

Discharge temperature

thermistor (RT62)

Measure the resistance with a tester. Before measurement, hold the

thermistor with your hands to warm it up.
Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C.

board”, for the chart of thermistor.

Compressor

Measure the resistance between terminals using a tester.

(Temperature: -10 to 40°C)

Normal (Ω)

MUZ-RW25VGHZ MUZ-RW35VGHZ MUZ-RW50VGHZ

U-V

U-W

V-W

0.82 - 1.11

0.87 - 1.18

1.45 - 1.79

WHT

RED BLK

Outdoor fan motor

Measure the resistance between lead wires using a tester.

(Temperature: -10 ~ 40°C)

Color of lead wire

Normal (Ω)

MUZ-

RW25/35VGHZ

MUZ-RW50VGHZ

RED – BLK

BLK – WHT

WHT – RED

32 - 43

25 - 34

WHT

RED BLK

R.V. coil (21S4)

Measure the resistance using a tester. (Temperature: -10 to 40°C)

Normal (kΩ)

MUZ-

RW25/35VGHZ

MUZ-RW50VGHZ

0.39 - 0.60

1.19 - 1.78

Expansion valve coil

(LEV)

Measure the resistance using a tester. (Temperature: -10 to 40°C)

Color of lead wire

Normal (Ω)

RED – ORN

37 - 54

RED – WHT

RED – BLU

RED – YLW

RED

(+12V)

YLW

BLU

WHT
ORN

LEV

Defrost heater

Measure the resistance using a tester. (Temperature: -10 to 40°C)

Normal (Ω)

MUZ-

RW25/35VGHZ

MUZ-RW50VGHZ

802 - 990

376 - 461

OBH903

Summary of Contents for MUZ-RW25VGHZ-E1

Page 1: ...GES 2 2 SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 3 3 PART NAMES AND FUNCTIONS 5 4 SPECIFICATION 6 5 NOISE CRITERIA CURVES 8 6 OUTLINES AND DIMENSIONS 9 7 WIRING DIAGRAM 11 8 REFRIGERANT SYSTEM DIAGRAM 12 9 PERFORMANCE CURVES 14 10 ACTUATOR CONTROL 25 11 SERVICE FUNCTIONS 26 12 TROUBLESHOOTING 27 13 DISASSEMBLY INSTRUCTIONS 48 MUZ RW25VGHZ MUZ RW35VGHZ No OBH903 HFC utilized R32 ...

Page 2: ...e power supply breaker and pull the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigeration cycle When the repair or the inspection of the circ...

Page 3: ...ing changed they shall be fit for the purpose and to the correct specification At all times the manufacturer s maintenance and service guidelines shall be followed If in doubt consult the manufacturer s technical department for assistance The following checks shall be applied to installations using flammable refrigerants The charge size is in accordance with the room size within which the refriger...

Page 4: ...ly familiar with the equipment and all its detail It is recommended good practice that all refrigerants are recovered safely Prior to the task being carried out an oil and refrigerant sample shall be taken in case analysis is required prior to reuse of reclaimed refrigerant It is essential that electrical power is available before the task is commenced a Become familiar with the equipment and its ...

Page 5: ...PART NAMES AND FUNCTIONS 3 MUZ RW25VGHZ MUZ RW35VGHZ MUZ RW50VGHZ Air outlet Drain outlet Piping Drain hose Air inlet Back and side Air outlet Drain outlet Piping Drain hose Air inlet Back and side OBH903 ...

Page 6: ...S 0 46 FW68S Fan motor Model RC0J50 RA RC0J50 RA RC0J50 RC Current 1 Cooling A 0 20 0 23 0 65 Heating 0 23 0 23 0 78 Dimensions W H D mm 800 714 285 800 714 285 840 880 330 Weight kg 39 5 40 54 Special remarks Dehumidification Cooling L h 0 0 0 3 1 7 Airflow 1 Cooling High m h 3 114 3 114 3 804 Low 1 092 1 092 1 548 Heating High 2 268 2 328 3 336 Med 2 268 2 268 3 336 Low 996 996 1 644 Sound level...

Page 7: ... A 250 V X602 3 A 250 V R V coil 21S4 220 240 V AC Heater protector 26H Open 45 C Specifications and rated conditions of main electric parts Model Item MUZ RW25VGHZ MUZ RW35VGHZ Smoothing capacitor C61 C62 C63 620 µF 420 V Diode module DB61 DB65 25 A 600 V Fuse F701 F801 F901 T3 15AL250V F61 25 A 250 V F62 15 A 250 V Defrost heater H 230 V 60 W Power module IC700 20A 600V IC932 5 A 600 V Expansion...

Page 8: ...C 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR COOLING FUNCTION SPL dB A LINE HEATING 49 50 MUZ RW25VGHZ MUZ RW35VGHZ Test conditions Cooling Dry bulb temperature 35 C Heating Dry bulb temperature 7 C Wet bulb temperature 6 C OUTDOOR UNIT MICROPHONE 1 m MUZ RW50VGHZ SC1 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC...

Page 9: ...9 OUTLINES AND DIMENSIONS 6 Unit mm MUZ RW25VGHZ MUZ RW35VGHZ OBH903 ...

Page 10: ...10 MUZ RW50VGHZ Unit mm REQUIRED SPACE FLARED ø9 52 3 8 FLARED ø6 35 1 4 OBH903 ...

Page 11: ...11 WIRING DIAGRAM 7 MUZ RW25VGHZ MUZ RW35VGHZ MUZ RW50VGHZ OBH903 ...

Page 12: ... Strainer 100 Capillary tube ø4 0 ø2 4 100 Outdoor heat exchanger temperature thermistor RT68 Capillary tube ø3 0 ø2 0 240 Muffler Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve Capillary tube ø4 0 ø2 4 240 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø...

Page 13: ...TIONAL REFRIGERANT CHARGE R32 g Model Outdoor unit precharged Refrigerant piping length one way 7 m 8 m 9 m 10 m 11 m 12 m 13 m 14 m 15 m 16 m 17 m 18 m 19 m 20 m MUZ RW25VGHZ 1 200 0 0 0 0 20 40 60 80 100 120 140 160 180 200 MUZ RW35VGHZ 1 100 Calculation X g 20 g m Refrigerant piping length m 10 Model Outdoor unit precharged Refrigerant piping length one way 15 m 16 m 17 m 20 m 25 m 30 m MUZ RW5...

Page 14: ... indoor outlet air wet and dry bulb temperature for your reference at service 4 GUARANTEED OUTDOOR TEMPERATURE COOLING DB WB 10 46 HEATING DB WB 30 24 18 How to measure the indoor air wet and dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air...

Page 15: ... 0 9 1 0 1 1 1 2 1 3 Heating capacity at Rated frequency Capacity correction factor 15 20 26 25 20 Indoor intake air Dry bulb temperature Indoor air Wet bulb temperature difference C 21 6 19 9 18 2 16 6 14 9 13 3 11 6 9 9 8 3 6 6 MUZ RW50VGHZ 14 8 13 7 12 6 11 4 10 3 9 1 8 0 6 8 5 7 4 6 18 0 16 7 15 3 13 9 12 5 11 1 9 7 8 3 6 9 5 6 MUZ RW25VGHZ MUZ RW35VGHZ Outdoor intake air Wet bulb temperature ...

Page 16: ...ction factors Correction of Heating input The operational frequency of compressor Hz Input correction factors 0 50 100 0 0 5 1 0 1 5 0 50 100 0 0 5 1 0 1 5 0 50 100 150 0 0 5 1 0 1 5 2 0 0 50 100 150 0 1 0 2 0 MUZ RW50VGHZ Correction of Cooling capacity The operational frequency of compressor Hz Capacity correction factors Correction of Cooling input The operational frequency of compressor Hz Inpu...

Page 17: ...the international system of units SI unit system The conversion factor is 1 MPa Gauge 10 2 kgf cm2 Gauge 15 20 25 30 35 1 5 1 6 1 7 1 8 1 9 2 0 15 20 25 30 35 2 3 2 5 2 7 2 9 3 1 3 3 15 20 25 30 35 3 0 3 5 4 0 4 5 5 0 5 5 Outdoor unit current 50 60 70 50 60 70 MUZ RW25VGHZ Ambient temperature C Ambient humidity 50 60 70 MUZ RW35VGHZ Ambient temperature C Ambient humidity MUZ RW50VGHZ Ambient tempe...

Page 18: ...1 431 27 24 3 35 2 31 0 69 396 3 23 2 23 0 69 418 3 15 2 17 0 69 431 3 05 2 10 0 69 452 27 26 3 45 1 97 0 57 418 3 35 1 91 0 57 439 3 30 1 88 0 57 452 3 20 1 82 0 57 465 28 18 2 94 2 94 1 00 348 2 81 2 81 1 00 365 2 70 2 70 1 00 383 2 60 2 60 1 00 400 28 20 3 06 2 97 0 97 365 2 94 2 85 0 97 387 2 85 2 76 0 97 396 2 75 2 67 0 97 413 28 22 3 19 2 71 0 85 378 3 08 2 61 0 85 402 3 00 2 55 0 85 413 2 8...

Page 19: ...1 487 2 38 1 92 0 81 505 27 24 2 88 1 98 0 69 479 2 70 1 86 0 69 500 2 55 1 76 0 69 522 27 26 3 03 1 72 0 57 496 2 85 1 62 0 57 518 2 68 1 52 0 57 539 28 18 2 45 2 45 1 00 426 2 25 2 25 1 00 452 2 08 2 08 1 00 470 28 20 2 58 2 50 0 97 444 2 40 2 33 0 97 465 2 23 2 16 0 97 492 28 22 2 73 2 32 0 85 461 2 55 2 17 0 85 487 2 38 2 02 0 85 505 28 24 2 88 2 10 0 73 479 2 70 1 97 0 73 500 2 55 1 86 0 73 5...

Page 20: ...6 762 27 24 4 69 3 00 0 64 701 4 52 2 89 0 64 739 4 41 2 82 0 64 762 4 27 2 73 0 64 801 27 26 4 83 2 51 0 52 739 4 69 2 44 0 52 778 4 62 2 40 0 52 801 4 48 2 33 0 52 824 28 18 4 11 4 11 1 00 616 3 94 3 94 1 00 647 3 78 3 78 1 00 678 3 64 3 64 1 00 708 28 20 4 29 3 94 0 92 647 4 11 3 78 0 92 685 3 99 3 67 0 92 701 3 85 3 54 0 92 732 28 22 4 46 3 57 0 80 670 4 31 3 44 0 80 712 4 20 3 36 0 80 732 4 0...

Page 21: ...6 862 3 33 2 53 0 76 893 27 24 4 03 2 58 0 64 847 3 78 2 42 0 64 886 3 57 2 28 0 64 924 27 26 4 24 2 20 0 52 878 3 99 2 07 0 52 916 3 75 1 95 0 52 955 28 18 3 43 3 43 1 00 755 3 15 3 15 1 00 801 2 91 2 91 1 00 832 28 20 3 61 3 32 0 92 785 3 36 3 09 0 92 824 3 12 2 87 0 92 870 28 22 3 82 3 05 0 80 816 3 57 2 86 0 80 862 3 33 2 66 0 80 893 28 24 4 03 2 74 0 68 847 3 78 2 57 0 68 886 3 57 2 43 0 68 9...

Page 22: ... 27 24 6 70 3 48 0 52 1256 6 45 3 35 0 52 1325 6 30 3 28 0 52 1366 6 10 3 17 0 52 1435 27 26 6 90 2 76 0 40 1325 6 70 2 68 0 40 1394 6 60 2 64 0 40 1435 6 40 2 56 0 40 1477 28 18 5 88 5 41 0 92 1104 5 63 5 18 0 92 1159 5 40 4 97 0 92 1214 5 20 4 78 0 92 1270 28 20 6 13 4 90 0 80 1159 5 88 4 70 0 80 1228 5 70 4 56 0 80 1256 5 50 4 40 0 80 1311 28 22 6 38 4 34 0 68 1201 6 15 4 18 0 68 1277 6 00 4 08...

Page 23: ... 4 75 3 04 0 64 1601 27 24 5 75 2 99 0 52 1518 5 40 2 81 0 52 1587 5 10 2 65 0 52 1656 27 26 6 05 2 42 0 40 1573 5 70 2 28 0 40 1642 5 35 2 14 0 40 1711 28 18 4 90 4 51 0 92 1352 4 50 4 14 0 92 1435 4 15 3 82 0 92 1490 28 20 5 15 4 12 0 80 1408 4 80 3 84 0 80 1477 4 45 3 56 0 80 1559 28 22 5 45 3 71 0 68 1463 5 10 3 47 0 68 1546 4 75 3 23 0 68 1601 28 24 5 75 3 22 0 56 1518 5 40 3 02 0 56 1587 5 1...

Page 24: ...UT 15 0 49 116 1 00 219 1 52 324 2 00 421 2 52 527 3 04 632 3 56 713 4 08 770 4 60 818 5 08 842 5 60 859 21 0 43 124 0 92 235 1 40 340 1 88 446 2 40 567 2 88 672 3 40 745 3 88 802 4 40 842 4 88 867 5 38 899 26 0 13 143 0 64 259 1 12 365 1 64 486 2 16 608 2 68 713 3 16 786 3 68 842 4 20 883 4 68 907 5 20 932 MUZ RW50VGHZ CAPACITY 6 0 kW INPUT 1450 W INDOOR DB C OUTDOOR WB C 30 25 20 15 10 5 0 5 10 ...

Page 25: ...r Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protection Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Cooling Low ambient temperature operation Heating Defrosti...

Page 26: ... W MUZ RW50VGHZ Prolonged low load operation in which the thermostat is OFF for a long time at low outside temperature 0 C or less may cause the following troubles To prevent those troubles activate the pre heat control 1 If moisture gets into the refrigerant cycle and freezes it may interfere the startup of the compressor 2 If liquid refrigerant collects in the compressor a failure in the compres...

Page 27: ...age of smoothing capacitor 4 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality To make ...

Page 28: ...eck the blinking pattern and identify the abnormal point by referring to the table of indoor unit failure mode recall function Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button...

Page 29: ...l function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair the failure parts The outdoor unit is normal Release the failure mode recall function according to the left mentioned procedure Deleting the memorized abnormal condition After repairing the unit recall the failure mode aga...

Page 30: ...essor Check stop valve Compressor synchronous abnormality Compressor startup failure protection 12 time blink 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 12 5 How to check inverter compressor 5 time blink 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 116 C compressor stops Compressor can restart...

Page 31: ... VOLTAGE on the service manual of indoor and outdoor unit for the characteristics of the thermistors Do not start the operation again without repair to prevent hazards 16 time blink 2 5 seconds OFF 1 Outdoor refrigerant system abnormality 1 time blink 2 5 seconds OFF A closed valve and air trapped in the refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor the...

Page 32: ...mperature thermistor reads 100 C or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 12 5 Check of LEV 11 4 time blink 2 5 seconds OFF Fin temperature P C board temperature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink ex ceeds 75 86 C RW25 35 75 80 C RW50 or temperature of P C board temperature thermistor on the inverter P...

Page 33: ... will be activated in the following cases 1 Instantaneous power voltage drop Short time power failure 2 When the power supply voltage is high MUZ RW50 Zero cross detecting circuit Zero cross signal cannot be detected It occurs with following cases 1 Instantaneous power voltage drop Short time power failure 2 Distortion of primary voltage Refer to 12 5 Check of power supply 23 9 time blink 2 5 seco...

Page 34: ...essor Measure the resistance between terminals using a tester Temperature 10 to 40 C Normal Ω MUZ RW25VGHZ MUZ RW35VGHZ MUZ RW50VGHZ U V U W V W 0 82 1 11 0 87 1 18 1 45 1 79 W U V WHT RED BLK Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 10 40 C Color of lead wire Normal Ω MUZ RW25 35VGHZ MUZ RW50VGHZ RED BLK BLK WHT WHT RED 32 43 25 34 W U V WHT RED BLK R...

Page 35: ...0 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing the emergency operation switch on the indoor unit TEST RUN OPERATION Refer to 9 3 Measurement point At 3 points BLK U WHT V BLK U RED W WHT V RED W NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester 3 During this check LED of...

Page 36: ...t Compressor starts Abnormal IC700 failure Compressor winding short Abnormal Compressor lock out Starting defect Abnormal Poor contact Inverter P C board defect Disconnected connector Abnormal Refrigerant circuit defect Closed valve Normal 0 second 1 second 2 seconds 10 seconds 10 minutes Judgement After the compressor is heated with a drier does the compressor start 1 Replace the compressor Compr...

Page 37: ...easure the resistance of thermistor MUZ RW25 35VGHZ Thermistor Symbol Connector Pin No Board Defrost RT61 Between CN641 pin1 and pin2 Inverter P C board Discharge temperature RT62 Between CN641 pin3 and pin4 Fin temperature RT64 Between CN642 pin1 and pin2 Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 MUZ RW50VGHZ Thermisto...

Page 38: ...module IC700 Turn ON the power supply and press the emergency operation switch once COOL mode MUZ RW25 35VGHZ First of all measure the resistance of R V coil to check if the coil is defective Refer to 12 4 In case CN602 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN602 is connected ...

Page 39: ...easure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0V DC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the inverter P C board Yes Yes No Fixed to either 5 or 0 V DC No No Yes Disconnect the connectors CN931 and CN932 from the inverter P C board Check the connection between the...

Page 40: ... 12 6 1 No Replace the inverter P C board Is there bus bar voltage 260 370V DC between DB61 and DB61 MUZ RW25 35VGHZ 325 370V DC between IC700 P and N MUZ RW50VGHZ on the inverter P C board Refer to 12 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector between the compressor and the power module IC700 Turn ON power supply and press the emergency operation switch In...

Page 41: ...er Properly fix the LEV coil to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 12 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate when touching it Turn ON the power supply Preparation of the re...

Page 42: ...door fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the inverter P C board Does the LED blink 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 12 3 Yes No Yes 10 time blink No L Check of inverter P C board OBH903 ...

Page 43: ... the emergency operation starts No Does the outdoor LED light up Replace the indoor electronic control P C board Replace the indoor power P C board Yes Yes Yes Does the outdoor LED blink 6 times Yes Confirm that the thermostat is OFF and wiring is not loose No Does DC 6 V or more occur between indoor terminal block S2 and S3 Yes Replace the outdoor inverter P C board 1 No Turn the power supply OFF...

Page 44: ...air trapped in the refrigerant circuit Close the stop valve and disconnect the power plug or turn the breaker OFF The unit occasionally stops when the stop valve is opened or closed during operation Open the stop valve and start the cooling operation again Yes No The refrigerant gas amount may be 60 or less than the normal amount Identify where the gas is leaking from and fix the leak CAUTION Do n...

Page 45: ...the installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor out...

Page 46: ...Fuse F801 T3 15AL250V LEV CN724 Output to drive outdoor fan motor CN932 LED Smoothing capacitor C63 Fuse F61 25 A 250V Fuse F62 15 A 250 V 1 Inverter P C board 12 6 TEST POINT DIAGRAM AND VOLTAGE MUZ RW25VGHZ MUZ RW35VGHZ 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 0 ...

Page 47: ...g Capacitor CB3 R V coil 21S4 CN602 230 V AC Fuse F601 T3 15AL250V Fuse F880 T3 15AL250V Heater CN601 230 V AC Output to drive outdoor fan motor CN932 Fuse F62 15 A 250 V Fuse F61 25 A 250V Expansion valve coil LEV CN724 Ambient temperature thermistor RT65 CN672 Outdoor heat exchanger temperature thermistor RT68 CN671 Discharge temperature thermistor RT62 CN671 Defrost thermistor RT61 CN671 Compre...

Page 48: ...the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever 2 The terminal with this connector shown below has the locking mechanism Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the back panel Screws of the cabinet Screws of the service panel Screws of the cabinet Screws of the ...

Page 49: ...erature thermistor the defrost thermistor and discharge tempera ture thermistor to the connector on the inverter P C board Pull the lead wires toward you and put them on the right hook on the P C board support 2 Connect the lead wires of the LEV to the connector on the inverter P C board Pull the lead wires toward you and put them on the right hook on the P C board support 3 Connect the lead wires...

Page 50: ...ure thermistor from its holder 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder 6 Pull out the ambient temperature thermistor from its holder 5 Removing outdoor fan motor 1 Remove the cabinet and panels refer to section 1 2 Disconnect the following connectors Inverter P C board CN931 CN932 Fan motor 3 Remove the propelle...

Page 51: ...refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 4 Detach the brazed part of the suction and the discharge pipe connected with compressor 5 Remove the compressor nuts 6 Remove the compressor 7 Detach the brazed part of pipes connected with 4 way valve Photo 10 51 51 Brazed parts of 4 way valve Suction pipe brazed part Discharge pipe brazed part OBH9...

Page 52: ...e panel 5 Remove the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 2 Photo 1 52 52 Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screws of the service panel Screw of the val...

Page 53: ...fixing screws of the terminal block support and the back panel 7 Remove the inverter assembly 8 Remove the screws of the earth wire 9 Remove the screw of the heat sink support and the heat sink support from the P C board support 10 Remove the screws of the terminal block support and the screws of the earth wires and the terminal block support Photo 5 11 Remove the terminal block support Photo 3 Ph...

Page 54: ...sion valve coil to the connector on the inverter P C board Pull the lead wires of the expansion valve coil toward you and put them on the left hook on the P C board support as shown in Photo 6 Photo 5 Photo 7 Photo 6 54 Screws of the terminal block support Screws of the earth wires and the terminal block support Lead wires of the expansion valve coil Hook of the lead wires of the reactor Hook of t...

Page 55: ...rmistor from its holder Photo 10 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder Photo 8 6 Pull out the ambient temperature thermistor from its holder Photo 8 4 Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to section 1 2 Disconnect the following connectors Inverter P C board CN931 CN...

Page 56: ...Remove the compressor nuts 7 Remove the compressor 8 Detach the brazed parts of 4 way valve and pipe Photo 11 Photo 10 Figure 1 Photo 11 56 Brazed parts of 4 way valve Brazed part of the discharge pipe Brazed part of the suction pipe Discharge temperature thermistor Compressor protector Attach the compressor protector to the protector holder with the surface on which the model name is printed faci...

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