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Mitsubishi Electric MUZ-EF25VE, Service Manual

The Mitsubishi Electric MUZ-EF25VE is a cutting-edge air conditioning unit designed for efficient cooling or heating. To ensure hassle-free usage, make sure to download the Service Manual from manualshive.com for comprehensive instructions and troubleshooting tips. It's a free download that guarantees optimal performance and longer lifespan for your appliance.

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 Copyright 2010 MITSUBISHI ELECTRIC CORPORATION

Distributed in Dec.  2015. No. OBH590 REVISED EDITION-G
Distributed in Jan.  2015. No. OBH590 REVISED EDITION-F
Distributed in Oct.  2014. No. OBH590 REVISED EDITION-E
Distributed in Aug. 2014. No. OBH590 REVISED EDITION-D
Distributed in Jan.  2014. No. OBH590 REVISED EDITION-C
Distributed in Nov.  2012. No. OBH590 REVISED EDITION-B
Distributed in Mar.  2011. No. OBH590 REVISED EDITION-A
Distributed in Nov.  2010. No. OBH590 
Made in Japan

New publication, effective Dec. 2015
Specifications are subject to change without notice.

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Summary of Contents for MUZ-EF25VE

Page 1: ...R3 ET2 ET3 MUZ EF35VE E1 E2 E3 E4 E5 ER3 ER4 ER5 ET3 ET4 ET5 MUZ EF35VEH E1 E2 E3 E4 ER2 ER3 ET2 ET3 MUZ EF42VE E1 E2 E3 E4 E5 ER3 ER4 ER5 ET3 ET4 ET5 MUZ EF50VE E1 E2 E3 ER2 ER3 ET2 ET3 Revision G MUZ EF25 35 42VE E5 ER5 ET5 MUZ EF50VE E3 ER3 ET3 and MUZ EF25 35VEH E4 have been added CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 5 3 SPECIFICATION 6 4 NOISE CRITERIA CURVES 8 5 OUTLINES...

Page 2: ...ic parts has been corrected 3 Revision B MUZ EF25 35 42 50VE E2 and MUZ EF25 35VEH E2 have been added Revision C MUZ EF25 35 42VE E3 MUZ EF25 35 42VE ER3 MUZ EF50VE ER2 and MUZ EF25 35VEH ER2 have been added Revision D MUZ EF25 35 42VE ET3 MUZ EF50VE ET2 and MUZ EF25 35VEH ET2 have been added Revision E MUZ EF25 35 42VE E4 ER4 ET4 and MUZ EF25 35VEH E3 ER3 ET3 have been added Revision F The descri...

Page 3: ...ER2 MUZ EF35VE ER3 MUZ EF35VEH ER2 MUZ EF42VE ER3 MUZ EF50VE ER2 1 New model MUZ EF25VE ET3 MUZ EF25VEH ET2 MUZ EF35VE ET3 MUZ EF35VEH ET2 MUZ EF42VE ET3 MUZ EF50VE ET2 1 New model MUZ EF25VE E3 MUZ EF25VE E4 MUZ EF25VEH E2 MUZ EF25VEH E3 MUZ EF35VE E3 MUZ EF35VE E4 MUZ EF35VEH E2 MUZ EF35VEH E3 MUZ EF42VE E3 MUZ EF42VE E4 1 Outdoor fan motor has been changed 2 Inverter P C board has been changed ...

Page 4: ...H E3 MUZ EF25VEH E4 MUZ EF35VE E4 MUZ EF35VE E5 MUZ EF35VEH E3 MUZ EF35VEH E4 MUZ EF42VE E4 MUZ EF42VE E5 MUZ EF50VE E2 MUZ EF50VE E3 1 Model name has been changed MUZ EF25VE ER4 MUZ EF25VE ER5 MUZ EF35VE ER4 MUZ EF35VE ER5 MUZ EF42VE ER4 MUZ EF42VE ER5 MUZ EF50VE ER2 MUZ EF50VE ER3 1 Model name has been changed MUZ EF25VE ET4 MUZ EF25VE ET5 MUZ EF35VE ET4 MUZ EF35VE ET5 MUZ EF42VE ET4 MUZ EF42VE ...

Page 5: ...ck and side MUZ EF25VE MUZ EF25VEH MUZ EF35VE MUZ EF35VEH MUZ EF42VE PART NAMES AND FUNCTIONS 2 ACCESSORIES MODELS MUZ EF25VE MUZ EF35VE MUZ EF42VE MUZ EF50VE Drain socket 1 MUZ EF50VE Piping Air outlet Drain outlet Air inlet back and side Drain hose OBH590G ...

Page 6: ... SNB130FGAMT SNB130FGBMT Output W 550 650 900 Current 1 Cooling A 2 76 4 06 5 56 5 58 Heating 3 24 4 09 6 19 5 75 Refrigeration oil Model L 0 31 FV50S 0 27 FV50S 0 35 FV50S Fan motor Model RC0J50 FA 2 RC0J60 BD RC0J50 NA 3 Current 1 Cooling A 0 24 0 29 0 30 0 84 Heating 0 27 0 28 0 28 0 93 Dimensions W H D mm 800 550 285 840 880 330 Weight kg 30 35 54 Special remarks Dehumidification Cooling L h 0...

Page 7: ...1 T20AL250V F701 F801 F901 T3 15AL250V Defrost heater H 230 V 130 W 230 V 130 W Intelligent power module IC700 15 A 600 V 20 A 600 V IC932 8A600V Expansion valve coil LEV 12 V DC Reactor L61 18 mH 23 mH Power factor controller IC820 20A 600V Current limiting PTC thermistor PTC64 PTC65 33 Ω Terminal block TB 5 P Relay X63 3 A 250 V X64 20 A 250 V X66 3 A 250 V 3 A 250 V X69 10A 230V R V coil 21S4 2...

Page 8: ...F50VE 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 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATING 47 48 NC 10 MUZ EF25VE MUZ EF25VEH 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 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 ...

Page 9: ...0 mm or more 100 mm or more 100 mm or more 1 100 mm or more when front and sides of the unit are clear 2 When any 2 sides of left right and rear of the unit are clear Clear 1 200 mm or more 2 MUZ EF50VE OUTLINES AND DIMENSIONS 5 417 5 40 42 Drain hole 175 500 330 50 Air in Air out 2 holes 10 21 360 840 109 81 880 452 Service panel 99 5 164 5 195 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pi...

Page 10: ...10 WIRING DIAGRAM 6 MUZ EF25VE E1 E2 MUZ EF35VE E1 E2 MUZ EF25VE E3 E4 ER3 ER4 ET3 ET4 MUZ EF35VE E3 E4 ER3 ER4 ET3 ET4 OBH590G ...

Page 11: ...11 MUZ EF25VE E5 ER5 ET5 MUZ EF35VE E5 ER5 ET5 MUZ EF25VEH E1 MUZ EF35VEH E1 OBH590G ...

Page 12: ...12 MUZ EF25VEH E4 MUZ EF35VEH E4 MUZ EF25VEH E2 E3 ER2 ER3 ET2 ET3 MUZ EF35VEH E2 E3 ER2 ER3 ET2 ET3 OBH590G ...

Page 13: ...13 MUZ EF42VE E1 MUZ EF50VE E1 MUZ EF42VE E2 E3 E4 ER3 ER4 ET3 ET4 MUZ EF50VE E2 ER2 ET2 OBH590G ...

Page 14: ...14 MUZ EF42VE E5 ER5 ET5 MUZ EF50VE E3 ER3 ET3 OBH590G ...

Page 15: ...240 Outdoor heat exchanger temperature thermistor RT68 Muffler REFRIGERANT SYSTEM DIAGRAM 7 Unit mm MUZ EF35VE MUZ EF35VEH MUZ EF42VE Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainar Stop valve Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø9 52 with he...

Page 16: ...oor unit Outdoor unit MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Models Refrigerant piping m Piping size O D mm Max Length A Max Height difference B Gas Liquid MUZ EF25 35 42 20 12 9 52 6 35 MUZ EF50 30 15 12 7 ADDITIONAL REFRIGERANT CHARGE R410A g Models 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 EF25 800 0 30 60 90 12...

Page 17: ...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 Open windows and doors of room 5 Press the EMERGENCY...

Page 18: ...EF42VE MUZ EF25VEH MUZ EF35VE 20 6 19 0 17 4 15 8 14 3 12 7 11 1 9 5 7 9 6 3 MUZ EF35VEH MUZ EF25VE Outdoor intake air Wet bulb temperature C 20 15 10 5 0 5 10 15 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 Heating capacity at Rated frequency Capacity correction factor 15 20 26 Indoor intake air Dry bulb temperature Indoor air Dry bulb temperature difference C 17 6 16 2 14 9 13 5 12 2 10 8 9 5 8 1 6 8...

Page 19: ...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 operational frequency of compressor Hz The operational frequency of compressor Hz The operational frequency of compressor Hz Correction of Cooling capacity The op...

Page 20: ...OPERATION Refer to 8 3 8 4 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT Dry bulb temperature C Relative humidity 20 50 25 60 30 70 8 3 HOW TO OPERATE FIXED FREQUENCY OPERATION Test run operation 1 Press 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 ...

Page 21: ...EF25VE MUZ EF25VEH Outdoor unit current MUZ EF42VE MUZ EF50VE 0 5 10 15 20 25 1 5 2 0 2 5 3 0 0 5 10 15 20 25 3 5 4 0 4 5 5 0 5 5 0 5 10 15 20 25 2 5 3 0 3 5 4 0 0 5 10 15 20 25 4 0 4 5 5 0 5 5 Ambient temperature C Outdoor current A Ambient temperature C Outdoor current A Ambient temperature C Outdoor current A Ambient temperature C Outdoor current A MUZ EF35VE MUZ EF35VEH MUZ EF25VE MUZ EF25VEH ...

Page 22: ...3 0 74 540 27 24 3 35 2 08 0 62 496 3 23 2 00 0 62 523 3 15 1 95 0 62 540 3 05 1 89 0 62 567 27 26 3 45 1 73 0 50 523 3 35 1 68 0 50 550 3 30 1 65 0 50 567 3 20 1 60 0 50 583 28 18 2 94 2 94 1 00 436 2 81 2 81 1 00 458 2 70 2 70 1 00 480 2 60 2 60 1 00 501 28 20 3 06 2 76 0 90 458 2 94 2 64 0 90 485 2 85 2 57 0 90 496 2 75 2 48 0 90 518 28 22 3 19 2 49 0 78 474 3 08 2 40 0 78 504 3 00 2 34 0 78 51...

Page 23: ... 0 74 610 2 38 1 76 0 74 632 27 24 2 88 1 78 0 62 600 2 70 1 67 0 62 627 2 55 1 58 0 62 654 27 26 3 03 1 51 0 50 621 2 85 1 43 0 50 649 2 68 1 34 0 50 676 28 18 2 45 2 45 1 00 534 2 25 2 25 1 00 567 2 08 2 08 1 00 589 28 20 2 58 2 32 0 90 556 2 40 2 16 0 90 583 2 23 2 00 0 90 616 28 22 2 73 2 13 0 78 578 2 55 1 99 0 78 610 2 38 1 85 0 78 632 28 24 2 88 1 90 0 66 600 2 70 1 78 0 66 627 2 55 1 68 0 ...

Page 24: ...0 0 62 901 27 24 4 69 2 35 0 50 828 4 52 2 26 0 50 874 4 41 2 21 0 50 901 4 27 2 14 0 50 946 27 26 4 83 1 84 0 38 874 4 69 1 78 0 38 919 4 62 1 76 0 38 946 4 48 1 70 0 38 974 28 18 4 11 3 70 0 90 728 3 94 3 54 0 90 764 3 78 3 40 0 90 801 3 64 3 28 0 90 837 28 20 4 29 3 34 0 78 764 4 11 3 21 0 78 810 3 99 3 11 0 78 828 3 85 3 00 0 78 865 28 22 4 46 2 95 0 66 792 4 31 2 84 0 66 842 4 20 2 77 0 66 86...

Page 25: ...3 33 2 06 0 62 1056 27 24 4 03 2 01 0 50 1001 3 78 1 89 0 50 1047 3 57 1 79 0 50 1092 27 26 4 24 1 61 0 38 1037 3 99 1 52 0 38 1083 3 75 1 42 0 38 1128 28 18 3 43 3 09 0 90 892 3 15 2 84 0 90 946 2 91 2 61 0 90 983 28 20 3 61 2 81 0 78 928 3 36 2 62 0 78 974 3 12 2 43 0 78 1028 28 22 3 82 2 52 0 66 965 3 57 2 36 0 66 1019 3 33 2 19 0 66 1056 28 24 4 03 2 17 0 54 1001 3 78 2 04 0 54 1047 3 57 1 93 ...

Page 26: ...7 24 5 63 2 36 0 42 1165 5 42 2 28 0 42 1229 5 29 2 22 0 42 1267 5 12 2 15 0 42 1331 27 26 5 80 1 74 0 30 1229 5 63 1 69 0 30 1293 5 54 1 66 0 30 1331 5 38 1 61 0 30 1370 28 18 4 94 4 05 0 82 1024 4 73 3 87 0 82 1075 4 54 3 72 0 82 1126 4 37 3 58 0 82 1178 28 20 5 15 3 60 0 70 1075 4 94 3 45 0 70 1139 4 79 3 35 0 70 1165 4 62 3 23 0 70 1216 28 22 5 36 3 11 0 58 1114 5 17 3 00 0 58 1184 5 04 2 92 0...

Page 27: ... 99 2 15 0 54 1485 27 24 4 83 2 03 0 42 1408 4 54 1 91 0 42 1472 4 28 1 80 0 42 1536 27 26 5 08 1 52 0 30 1459 4 79 1 44 0 30 1523 4 49 1 35 0 30 1587 28 18 4 12 3 38 0 82 1254 3 78 3 10 0 82 1331 3 49 2 86 0 82 1382 28 20 4 33 3 03 0 70 1306 4 03 2 82 0 70 1370 3 74 2 62 0 70 1446 28 22 4 58 2 66 0 58 1357 4 28 2 48 0 58 1434 3 99 2 31 0 58 1485 28 24 4 83 2 22 0 46 1408 4 54 2 09 0 46 1472 4 28 ...

Page 28: ...7 24 6 70 2 75 0 41 1420 6 45 2 64 0 41 1498 6 30 2 58 0 41 1544 6 10 2 50 0 41 1622 27 26 6 90 2 00 0 29 1498 6 70 1 94 0 29 1576 6 60 1 91 0 29 1622 6 40 1 86 0 29 1669 28 18 5 88 4 76 0 81 1248 5 63 4 56 0 81 1310 5 40 4 37 0 81 1373 5 20 4 21 0 81 1435 28 20 6 13 4 23 0 69 1310 5 88 4 05 0 69 1388 5 70 3 93 0 69 1420 5 50 3 80 0 69 1482 28 22 6 38 3 63 0 57 1357 6 15 3 51 0 57 1443 6 00 3 42 0...

Page 29: ...4 75 2 52 0 53 1810 27 24 5 75 2 36 0 41 1716 5 40 2 21 0 41 1794 5 10 2 09 0 41 1872 27 26 6 05 1 75 0 29 1778 5 70 1 65 0 29 1856 5 35 1 55 0 29 1934 28 18 4 90 3 97 0 81 1529 4 50 3 65 0 81 1622 4 15 3 36 0 81 1685 28 20 5 15 3 55 0 69 1591 4 80 3 31 0 69 1669 4 45 3 07 0 69 1763 28 22 5 45 3 11 0 57 1654 5 10 2 91 0 57 1747 4 75 2 71 0 57 1810 28 24 5 75 2 59 0 45 1716 5 40 2 43 0 45 1794 5 10...

Page 30: ...6 2 16 716 2 68 840 3 16 926 3 68 993 4 20 1041 4 68 1070 5 20 1098 MUZ EF42VE CAPACITY 5 4 kW INPUT 1460 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 40 949 4 10 1139 4 81 1285 5 51 1387 6 21 1475 6 86 1518 7 56 1548 21 3 24 1022 3 89 1212 4 59 1343 5 24 1445 5 94 1518 6 59 1562 7 26 1621 26 2 92 1095 3 62 1285 4 27 1416 4 97 1518 5 67 ...

Page 31: ...or starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running 9 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor 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 protec tion Defrost thermistor H...

Page 32: ... how many times the OPERATION INDICATOR lamp is flashing on and off before starting service work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 Refer to 11 2 and 11 3 Lead wiring Connector housing Incorrec...

Page 33: ...oes the left lamp of OPERATION INDICA TOR lamp stay ON for 3 seconds When it stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mo...

Page 34: ...n 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 mentioned procedure Deleting the memorized abnormal condition After repairing the unit recall the failure mode again accor...

Page 35: ...ssor Check the stop valve Compressor synchronous abnormality Compressor start up failure protection 12 time flash 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 11 5 How to check inverter compressor 5 time flash 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 116 C compressor stops Compressor can res...

Page 36: ...ach phase current of compressor cannot be detected normally 14 time flash or more 2 5 seconds OFF Stop valve Closed valve 14 time flash 2 5 seconds OFF Closed valve is detected by compressor current Check the stop valve 4 way valve Pipe temperature 16 time flash 2 5 seconds OFF The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Check the 4 way valve R...

Page 37: ...hermistor 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 the around outdoor unit Check the outdoor unit air passage Refer to 11 5 Check of outdoor fan motor 12 5 time flash 2 5 seconds OFF High pressure pro tection Indoor coil thermistor exceeds 70 C in...

Page 38: ...his is not malfunction 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 flash 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected inverter check mode starts Check the if the connector of the compressor is correctly connected Refer to 11 5 How to check i...

Page 39: ...e 1 Inverter P C board for the chart of thermistor Compressor Measure the resistance between terminals using a tester Temperature 10 40 C Normal Ω MUZ EF25 MUZ EF35 42 MUZ EF50 U V U W V W 1 36 1 93 1 52 2 17 0 78 1 11 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 EF25 35 42 MUZ EF50 RED BLK BLK WHT ...

Page 40: ...heck of open phase C Check of compressor With the connector between the compressor and the intelligent power module disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals Output voltage is 50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION ...

Page 41: ...h a drier for about 20 minutes Do not recover refrigerant gas while heating Heating part Connect the compressor and activate the inverter Then measure the time until the inverter stops due to overcurrent Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 8 3 Measurement Measure the time from the start of compres...

Page 42: ...sistance of thermistor First of all measure the resistance of R V coil to check if the coil is defective Refer to 11 4 In case CN721 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 CN721 is connected Is there 230 VAC between CN721 and on the inverter P C board 3 minutes after the power ...

Page 43: ...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 0 VDC 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 VDC No No Yes Disconnect the connectors CN931 and CN932 from the inverter P C board Check the connection between the ...

Page 44: ...NDICATOR lamp on the indoor unit light up Does LED on the inverter P C board light up or flash Refer to 11 6 1 No Replace the inverter P C board Is there voltage 260 370 VDC between DB61 and DB61 on the inverter P C board Refer to 11 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector between compressor and inverter module Turn ON power supply and press EMERGENCY OP...

Page 45: ...oltage by an analog tester 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 11 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate when touching it Turn ON the power supp...

Page 46: ...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 flash 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 11 3 Yes No Yes 10 time flash No L Check of inverter P C board OBH590G ...

Page 47: ...ctronic control P C board No Does the indoor OPERATION INDICATOR lamp left blink continuously 6 minutes after 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 Does the outdoor LED blink 6 times Yes Confirm that the thermostat is OFF and wiring is not loose No Does DC 6V or more occur between i...

Page 48: ... and let the defrost thermistor continue to read 1 C or below NOTE In case both thermistors are more than the above temperature cool them with cold water etc MUZ EF VEH Has the operation stopped during pump down Was the operation started with the stop valve closed and was it opened during operation No Yes O Check of outdoor refrigerant circuit The operation has stopped to pre vent the diesel explo...

Page 49: ...f 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 outdoor unit of the air conditioner indoor ...

Page 50: ...g JS Signal of outdoor fan motor CN931 230 VAC Outdoor heat exchanger temperature thermistor RT68 CN644 Jumper wire for pre heat control setting JK Heater connector CN722 MUZ EF25 35VEH MUZ EF42 50VE Fuse F801 T3 15AL250V Back side of unit LEV connector CN724 Output to drive outdoor fan motor CN932 LED 20 10 0 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 Temperature Defrost thermistor RT61 Ambient...

Page 51: ...s connector 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 Back panel Service panel Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the service panel Direction to remove Screws of the cabinet Hooks Terminal with locking mechanism Detaching poi...

Page 52: ...e the cabinet and panels Refer to 1 2 Disconnect the following connectors Inverter P C board CN721 R V coil 3 Remove the R V coil 4 Removing the discharge temperature thermistor defrost thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following con nectors Invert...

Page 53: ...and panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Recover gas from the 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 nuts of compressor legs 6 Remove the compressor 7 Detach the brazed part of pipes connected with 4 way valve Defr...

Page 54: ...move 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 1 Photo 2 Screws of the cabinet Screws of the top panel Screws of the top panel Screw of the back panel Screws of the cabinet Screws of the cabinet Screws of the service panel Screw of th...

Page 55: ...ove the inverter assembly 7 Remove the screw of the earth wire screw of the P C board cover and screws of the terminal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and the inverter P C board from the P C board support Photo 3 Photo 4 Photo 5 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the follow...

Page 56: ...cabinet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller fan nut 4 Remove the propeller fan 5 Remove the screws fixing the fan motor 6 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter...

Page 57: ...57 OBH590G ...

Page 58: ...ributed in Aug 2014 No OBH590 REVISED EDITION D Distributed in Jan 2014 No OBH590 REVISED EDITION C Distributed in Nov 2012 No OBH590 REVISED EDITION B Distributed in Mar 2011 No OBH590 REVISED EDITION A Distributed in Nov 2010 No OBH590 Made in Japan New publication effective Dec 2015 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 ...

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