Mitsubishi Electric MUZ-DW25VF Page 9 Service Manual Download | Manualshive

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MUZ-DW25VF

MUZ-DW35VF

MUZ-DW35VF
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Unit: mm

OUTLINES AND DIMENSIONS

6

MUZ-DW50VF

MUZ-DW25VF MUZ-DW35VF

OBH906A

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Summary of Contents for MUZ-DW25VF

Page 1: ...S 9 7 WIRING DIAGRAM 10 8 REFRIGERANT SYSTEM DIAGRAM 12 9 PERFORMANCE CURVES 14 10 ACTUATOR CONTROL 26 11 SERVICE FUNCTIONS 27 12 TROUBLESHOOTING 28 13 DISASSEMBLY INSTRUCTIONS 49 MUZ DW25VF MUZ DW35VF Indoor unit service manual MSZ DW VF Series OBH905 No OBH906 REVISED EDITION A Models MUZ DW25VF E1 ER1 ET1 MUZ DW35VF E1 ER1 ET1 MUZ DW50VF E1 ER1 ET1 OBH906 is void Revision A 6 OUTLINES AND DIMEN...

Page 2: ...ive parts Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents cau...

Page 3: ... being changed they shall be fit for the purpose and to the correct specification At all times the manufacturer s mainte nance 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 refr...

Page 4: ...familiar with the equipment and all its detail It is recommended good prac tice 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 re use of reclaimed refrigerant It is essential that electrical power is available before the task is commenced 1 Become familiar with the equipment and its o...

Page 5: ...S AND FUNCTIONS 3 ACCESSORIES MODELS MUZ DW25VF MUZ DW35VF MUZ DW50VF Drain socket 1 Air outlet Drain outlet Piping Drain hose Air inlet back and side MUZ DW50VF Drain outlet Air outlet Air inlet back and side Piping Drain hose OBH906A ...

Page 6: ...RC0J20 BC RC0J50 NC Current 1 Cooling A 0 23 0 30 Heating 0 25 0 27 Dimensions W H D mm 699 538 249 800 550 285 Weight kg 23 24 35 Special remarks Dehumidification Cooling L h 0 5 1 1 2 2 Air flow 1 Cooling High m3 h 1 818 1 932 2 124 Low 990 1 050 1 038 Heating High 1 932 2 052 2 034 Med 1 680 1 788 1 710 Low 1 260 1 350 1 332 Sound level 1 Cooling dB A 50 51 50 Heating 50 51 Fan speed Cooling Hi...

Page 7: ...B61 15 A 600 V 25 A 600 V DB65 25 A 600 V Fuse F61 15A 250V 25 A 250 V F62 15A 250 V F701 F801 F901 T3 15AL250 V Power module IC700 15 A 600 V 20 A 600 V IC932 5 A 600 V Expansion valve coil LEV 12 V DC Reactor L61 18 mH 23 mH Switch power transistor Q821 30 37 A 600 V Current limiting PTC thermistor PTC64 33 Ω PTC65 33 Ω Terminal block TB1 5 P Relay X63 3 A 250 V X64 20 A 250 V R V coil 21S4 220 ...

Page 8: ... 10 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR COOLING FUNCTION SPL dB A LINE HEATING 50 50 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz NC 10 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR COOLING FUNCTION SPL dB A LINE HEATING 50 51 Test conditions Cooling Dry bulb temperature 35 C Wet bulb temp...

Page 9: ...9 MUZ DW25VF MUZ DW35VF MUZ DW35VF only Unit mm OUTLINES AND DIMENSIONS 6 MUZ DW50VF MUZ DW25VF MUZ DW35VF OBH906A ...

Page 10: ...1 F62 F701 F801 F901 IC700 IC932 IC802 LED KONNEKTÖR KAPASİTÖR DİYOT MODÜLÜ SİGORTA 25A 250V SİGORTA 15A 250V SİGORTA T3 15AL250V GÜÇ MODÜLÜ GÜÇ CİHAZI LED LEV L61 MC MF PTC65 Q821 RT61 RT62 GENLEŞME VANASI SARGISI REAKTÖR KOMPRESÖR FAN MOTORU DEVRE KORUMASI SİVİÇLİ GÜÇ TRANSİSTÖRÜ DEFROST TERMİSTÖRÜ BASMA SICAKLIK TERMİSTÖRÜ RT64 RT65 TB1 T801 X63 X64 21S4 FİN SICAKLIK TERMİSTÖRÜ ORTAM SICAKLIK T...

Page 11: ...00 IC932 IC802 LED KONNEKTÖR KAPASİTÖR DİYOT MODÜLÜ SİGORTA 25A 250V SİGORTA 15A 250V SİGORTA T3 15AL250V GÜÇ MODÜLÜ GÜÇ CİHAZI LED LEV L61 MC MF PTC64 PTC65 Q821 RT61 RT62 GENLEŞME VANASI SARGISI REAKTÖR KOMPRESÖR FAN MOTORU DEVRE KORUMASI SİVİÇLİ GÜÇ TRANSİSTÖRÜ DEFROST TERMİSTÖRÜ BASMA SICAKLIK TERMİSTÖRÜ RT64 RT65 TB1 T801 X63 X64 21S4 FİN SICAKLIK TERMİSTÖRÜ ORTAM SICAKLIK TERMİSTÖRÜ TERMİNAL...

Page 12: ... temperature thermistor RT68 Stop valve with service port Capillary tube ø4 0 ø2 4 100 Muffler REFRIGERANT SYSTEM DIAGRAM 8 MUZ DW25VF MUZ DW35VF Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Stop valve Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø...

Page 13: ... DW35VF MUZ DW50VF 20 12 9 52 6 35 ADDITIONAL 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 20 m MUZ DW25VF 500 0 10 30 50 70 90 110 130 150 250 MUZ DW35VF 550 MUZ DW50VF 970 Calculation X g 20 g m Refrigerant piping length m 7 5 NOTE Refrigerant piping exceeding 7 5 m requires additional refrigerant charge accord...

Page 14: ... 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 outlet The thermometers must be attached to the position where air speed is high 2 Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake Cover the thermometers to prevent direct rays of the sun 3 Check that the air filter is cleaned 4...

Page 15: ...5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 Total input Heating at Rated frequency Input correction factor 15 20 26 Indoor intake air Dry bulb temperature 22 0 20 3 18 6 16 9 15 2 13 5 11 8 10 2 8 5 6 8 28 0 25 9 23 7 21 6 19 4 17 2 15 1 12 9 10 8 8 6 20 0 18 5 16 9 15 4 13 8 12 3 10 8 9 2 7 7 6 2 MUZ DW50VF MUZ DW35VF MUZ DW25VF Indoor air Dry bulb temperature difference C Outdoor intake air Wet bulb tempe...

Page 16: ...s Correction of Cooling input Input correction factors Correction of Heating capacity Capacity correction factors MUZ DW50VF Correction of Heating input Capacity correction factors The operational frequency of compressor Hz The operational frequency of compressor Hz The operational frequency of compressor Hz The operational frequency of compressor Hz The operational frequency of compressor Hz The ...

Page 17: ...URRENT Dry bulb temperature C Relative humidity 20 50 25 60 30 70 9 3 HOW TO OPERATE FIXED FREQUENCY OPERATION Test run operation 1 Press the emergency operation switch to start COOL or HEAT mode COOL Press once HEAT Press twice 2 Test run operation starts and continues to operate for 30 minutes 3 Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode 4 Indoor fan operates at Hi...

Page 18: ...5VF Outdoor unit current MUZ DW35VF MUZ DW50VF Ambient temperature C Outdoor current A Ambient temperature C Outdoor current A Ambient temperature C Outdoor current A 15 20 25 30 35 1 5 2 0 2 5 3 0 3 5 15 20 25 30 35 3 4 5 6 7 15 20 25 30 35 5 6 7 8 9 MUZ DW25VF Outdoor unit current MUZ DW35VF MUZ DW50VF Ambient temperature C Ambient humidity Ambient temperature C Ambient humidity Outdoor current ...

Page 19: ... 792 27 24 3 35 1 88 0 56 728 3 23 1 81 0 56 768 3 15 1 76 0 56 792 3 05 1 71 0 56 832 27 26 3 45 1 52 0 44 768 3 35 1 47 0 44 808 3 30 1 45 0 44 832 3 20 1 41 0 44 856 28 18 2 94 2 82 0 96 640 2 81 2 70 0 96 672 2 70 2 59 0 96 704 2 60 2 50 0 96 736 28 20 3 06 2 57 0 84 672 2 94 2 47 0 84 712 2 85 2 39 0 84 728 2 75 2 31 0 84 760 28 22 3 19 2 30 0 72 696 3 08 2 21 0 72 740 3 00 2 16 0 72 760 2 88...

Page 20: ... 896 2 38 1 62 0 68 928 27 24 2 88 1 61 0 56 880 2 70 1 51 0 56 920 2 55 1 43 0 56 960 27 26 3 03 1 33 0 44 912 2 85 1 25 0 44 952 2 68 1 18 0 44 992 28 18 2 45 2 35 0 96 784 2 25 2 16 0 96 832 2 08 1 99 0 96 864 28 20 2 58 2 16 0 84 816 2 40 2 02 0 84 856 2 23 1 87 0 84 904 28 22 2 73 1 96 0 72 848 2 55 1 84 0 72 896 2 38 1 71 0 72 928 28 24 2 88 1 73 0 60 880 2 70 1 62 0 60 920 2 55 1 53 0 60 96...

Page 21: ... 24 4 56 2 19 0 48 1101 4 39 2 11 0 48 1162 4 28 2 06 0 48 1198 4 15 1 99 0 48 1258 27 26 4 69 1 69 0 36 1162 4 56 1 64 0 36 1222 4 49 1 62 0 36 1258 4 35 1 57 0 36 1295 28 18 4 00 3 52 0 88 968 3 83 3 37 0 88 1016 3 67 3 23 0 88 1065 3 54 3 11 0 88 1113 28 20 4 17 3 17 0 76 1016 4 00 3 04 0 76 1077 3 88 2 95 0 76 1101 3 74 2 84 0 76 1150 28 22 4 34 2 77 0 64 1053 4 18 2 68 0 64 1119 4 08 2 61 0 6...

Page 22: ...3 23 1 94 0 60 1404 27 24 3 91 1 88 0 48 1331 3 67 1 76 0 48 1392 3 47 1 66 0 48 1452 27 26 4 11 1 48 0 36 1379 3 88 1 40 0 36 1440 3 64 1 31 0 36 1500 28 18 3 33 2 93 0 88 1186 3 06 2 69 0 88 1258 2 82 2 48 0 88 1307 28 20 3 50 2 66 0 76 1234 3 26 2 48 0 76 1295 3 03 2 30 0 76 1367 28 22 3 71 2 37 0 64 1283 3 47 2 22 0 64 1355 3 23 2 07 0 64 1404 28 24 3 91 2 03 0 52 1331 3 67 1 91 0 52 1392 3 47...

Page 23: ...7 24 6 70 2 68 0 40 1866 6 45 2 58 0 40 1968 6 30 2 52 0 40 2030 6 10 2 44 0 40 2132 27 26 6 90 1 93 0 28 1968 6 70 1 88 0 28 2071 6 60 1 85 0 28 2132 6 40 1 79 0 28 2194 28 18 5 88 4 70 0 80 1640 5 63 4 50 0 80 1722 5 40 4 32 0 80 1804 5 20 4 16 0 80 1886 28 20 6 13 4 17 0 68 1722 5 88 4 00 0 68 1825 5 70 3 88 0 68 1866 5 50 3 74 0 68 1948 28 22 6 38 3 57 0 56 1784 6 15 3 44 0 56 1896 6 00 3 36 0...

Page 24: ... 75 2 47 0 52 2378 27 24 5 75 2 30 0 40 2255 5 40 2 16 0 40 2358 5 10 2 04 0 40 2460 27 26 6 05 1 69 0 28 2337 5 70 1 60 0 28 2440 5 35 1 50 0 28 2542 28 18 4 90 3 92 0 80 2009 4 50 3 60 0 80 2132 4 15 3 32 0 80 2214 28 20 5 15 3 50 0 68 2091 4 80 3 26 0 68 2194 4 45 3 03 0 68 2317 28 22 5 45 3 05 0 56 2173 5 10 2 86 0 56 2296 4 75 2 66 0 56 2378 28 24 5 75 2 53 0 44 2255 5 40 2 38 0 44 2358 5 10 ...

Page 25: ...NPUT Q INPUT Q INPUT Q INPUT 15 2 27 634 2 74 761 3 20 858 3 67 926 4 14 985 4 57 1014 5 04 1034 21 2 16 683 2 59 809 3 06 897 3 49 965 3 96 1014 4 39 1043 4 84 1082 26 1 94 731 2 41 858 2 84 946 3 31 1014 3 78 1063 4 21 1092 4 68 1121 MUZ DW50VF CAPACITY 5 40 kW INPUT 1550 W INDOOR DB C OUTDOOR WB C 10 5 0 5 10 15 20 Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 3 40 1008 4 10 1209 4...

Page 26: ... turns OFF 15 seconds after the compressor has stopped running 10 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Heating Defrosting Fin temperature thermistor...

Page 27: ...rt up of the compressor at low outside temperature The pre heat control prevents this interference The pre heat control turns ON when the discharge temperature thermis tor is 20 C or below When the pre heat control turns ON the compressor is energized About 50 W Pre heat control setting JK ON To activate the pre heat control cut the JK wire of the inverter P C board OFF To deactivate the pre heat ...

Page 28: ...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 TROUBLESHOOTING 12 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality To mak...

Page 29: ...and turn it ON again Press RESET button of the remote controller The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the table of outdoor unit failure mode recall function Refer to outdoor unit service manual Make sure to check at least 2 consecutive blinking cycles 3 Repair the failure parts Yes Blinks No OFF Setting up the failure mode recall f...

Page 30: ...l function 12 2 3 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 of the remote controller Repair the failure parts The outdoor unit is normal Release the failure mode recall function accord ing to the left men...

Page 31: ...ds OFF Large current flows into power module IC700 Reconnect compressor connector Refer to 12 5 How to check inverter compressor Check stop valve Compressor synchronous abnormality Compressor start up 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...

Page 32: ...erter compressor Each phase current of compressor 9 time blink 2 5 seconds OFF Each phase current of compressor cannot be detected normally 14 time blink 2 5 seconds OFF Stop valve Closed valve 14 time blink 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve 4 way valve Pipe temperature 16 time blink 2 5 seconds OFF The 4 way valve does not work properly The indoor coi...

Page 33: ...es 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 tem perature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink exceeds 75 86 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 72 85 C Check around outdoor unit Check outdoor unit...

Page 34: ...unction PAM pro tection will be activated in the fol lowing cases 1 Instantaneous power voltage drop Short time power failure 2 When the power supply voltage is high 23 9 time blink 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected inverter check mode starts Check if the connector of the com pressor is correctly connected Refer to 12 5 How to check inverter compressor...

Page 35: ...ram and voltage 1 Inverter P C board for the chart of thermistor Compressor Measure the resistance between terminals using a multimeter Temperature 10 40 C Normal Ω MUZ DW25VF MUZ DW35VF MUZ DW50VF U V U W V W 2 27 2 80 1 59 2 16 0 82 1 11 W U V WHT RED BLK Outdoor fan motor Measure the resistance between lead wires using a multimeter Temperature 10 40 C Color of lead wire Normal Ω MUZ DW25 35VF M...

Page 36: ... V The voltage may differ according to the multimeter 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 multimeter 3 During this check LED...

Page 37: ...sor due to overcurrent 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...

Page 38: ...10 minutes or more without showing thermistor abnormality OK Cause is poor contact Yes Yes Disconnect the connector of thermistor in the inverter P C board see below table and measure the resistance of thermistor 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 CN...

Page 39: ... inverter P C board Replace the 4 way valve Unit operates in COOL mode even if it is set to HEAT mode Is there 230 V AC between CN721 and on the inverter P C board 3 minutes after the power supply is turned ON Yes No Replace the inverter P C board Replace the 4 way valve Unit operates in HEAT mode even if it is set to COOL mode Disconnect connector between the compressor and the IGBT module IC700 ...

Page 40: ...asure 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 0 V 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 41: ... the indoor unit light up Does LED on the inverter P C board light up or blink Refer to 12 6 1 No Replace the inverter P C board Is there bus bar voltage 260 370 V DC between DB61 and DB61 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 emer...

Page 42: ...ween each NOTE Measure the voltage by an analog multimeter 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 to...

Page 43: ...oor fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter 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 OBH906A ...

Page 44: ... the power supply is turned ON Touch CN10A and GND with multimeter probes and start the emergency operation During the emergency opera tion does DC 2V or less occur for 2 seconds between CN10A and GND on the indoor elec tronic control P C board No Does the indoor OPERATION INDICATOR lamp upper blink continuously 6 minutes after the emergency operation starts No Does the outdoor LED light up Replac...

Page 45: ...ir 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 no...

Page 46: ...he 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 outd...

Page 47: ...r CN932 R V coil 21S4 CN721 Smoothing capacitor C62 Fuse F701 T3 15AL250V Fuse F62 15 A 250 V Fuse F61 15 A 250 V Outdoor heat exchanger RT68 CN644 Ambient tem peraturer RT65 CN643 Fuse F901 T3 15AL250V 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature C Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Temperature C Disch...

Page 48: ... 100110120 Front side of unit Back side of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 DB61 260 370 V DC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Smoothing capacitor C61 Fuse F901 T3 15AL250V Jumper wire for changing defrost setting JS Signal of outdoor fan motor...

Page 49: ...s connector shown below has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Detaching method of the terminal with locking mechanism The terminal which has the locking mechanism can be detached as shown below There are following 2 types of the terminal with locking mechanism The ...

Page 50: ... the terminal block support 8 Remove the screw of the earth wire 9 Remove the screw of the terminal block and remove the terminal block 10 Remove the heat sink support from the P C board support 11 Unhook the catch of the inverter P C board and remove the inverter P C board from the P C board support 3 Removing the R V coil 1 Remove the cabinet and the panels Refer to section 1 2 Disconnect the fo...

Page 51: ...istor from its holder Photo 8 5 Pull out the outdoor heat exchanger temperature ther mistor from its holder 6 Pull out the ambient temperature thermistor from its holder 5 Removing the outdoor fan motor 1 Remove the cabinet and the panels Refer to section 1 2 Disconnect the following connectors Inverter P C board CN931 CN932 Fan motor 3 Remove the fan motor lead wire from where it is fas tened on ...

Page 52: ...ws of the separator and remove the separator 5 Remove the soundproof felt 6 Remove the terminal cover and the compressor lead wire 7 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 8 Detach the brazed part of the suction and the dis charge pipe connected with the compressor 9 Detach the brazed part of pipes connected with the 4...

Page 53: ... top panel 6 Remove the screws fixing the cabinet 7 Remove the cabinet 8 Remove the screws fixing the back panel 9 Remove the screws of the terminal block support and the back panel 10 Remove the back panel Photo 2 Photo 1 Photo 3 53 Back panel Service panel Screws of the top panel Screws of the terminal block support and the back panel Screws of the cabinet Screws of the back panel Screws of the ...

Page 54: ...onnection procedure when attaching the inverter P C board Photo 5 1 Connect the lead wires of the heat exchanger temperature thermistor to the connector on the inverter P C board Pull the lead wires of the heat exchanger temperature thermis tor toward you and put them on the left hook on the P C board support so that the other lead wires are bundled up as shown in Photo 5 2 Connect the lead wires ...

Page 55: ... ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature 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 cab...

Page 56: ...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 9 56 Brazed parts of 4 way valve Suction pipe brazed part Discharge pipe brazed part Discharge temperature thermistor HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2021 MITSUBISHI ELECTRIC CORPOR...

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