Mitsubishi Electric MUZ-EF25VE Скачать руководство пользователя страница 32 | Manualshive

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MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE

SERVICE FUNCTIONS

10

11-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following

1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after

confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic

control P.C. board.

3) When removing the electrical parts, be careful of the residual voltage 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.

MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE

TROUBLESHOOTING

11

3. Troubleshooting procedure

1) Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To

make sure, check 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

<Incorrect>

<Correct>

10-1. CHANGE IN DEFROST SETTING

Changing defrost finish temperature

<JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 11-6-1.)

Jumper wire

Defrost fi nish temperature (

°C

)

MUZ-EF25VE -

E1

MUZ-EF25VE -

E2

,

E3

,

E4

,

E5

,

ER3

,

ER4

,

ER5

,

ET3

,

ET4

,

ET5

MUZ-EF25VEH

MUZ-EF35VE

MUZ-EF35VEH

MUZ-EF42VE

MUZ-EF50VE

JS

Soldered
(Initial setting)

5°C

8°C

10°C

10°C

5°C

9°C

None (Cut)

8°C

15°C

13°C

15°C

10°C

18°C

10-2. PRE-HEAT CONTROL SETTING

PRE-HEAT CONTROL

When moisture gets into the refrigerant cycle, it may interfere the start-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 pre-heat control is turned ON, compressor is energized. (About 50 W)

<JK> To activate the pre-heat control, cut the JK wire of the inverter P.C. board. (Refer to 11-6.1.)

NOTE:

When the inverter P.C. board is replaced, check the Jumper wires, and cut/solder them if necessary.

OBH590G

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Содержание MUZ-EF25VE

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

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

Страница 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 ...

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

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 57: ...57 OBH590G ...

Страница 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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