Mitsubishi Electric MUZ-FA25VA-E1 Page 52 Service Manual Download | Manualshive

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How to check mis-wiring and serial signal error (when outdoor unit does not work)

O

35

When POWER lamp flashes ON and OFF in every 0.5-second.
Outdoor unit doesn’t operate.

Is serial signal
error indicated
6 minutes later?

No

· Turn OFF inverter-controlled lighting

equipment.

· Turn OFF the power supply and then

turn ON it again.

· Press EMERGENCY OPERATION

switch.

· Reinstall

either the
unit or the
light each
other away.

· Attach a filter

on receiving
section of
the indoor
unit.

Yes

B

A

Is there rated voltage of
230V AC in the power
supply?

In 3 minutes after turning ON the
power supply of the outdoor unit, does
the LED on the inverter P.C. board
repeat quick blinking "3.6-second-OFF
and 0.8-second-ON"?
Be sure to check above in 3 minutes
after turning ON. After 3 minutes, LED
blinks 6 times. When the inverter P.C.
board is normal, LED also blinks 6
times after 3 minutes.

Is there any mis-
wiring, poor contact,
or wire disconnection
of the
indoor/outdoor
connecting wire?

W

1. Mis-wiring may damage indoor electronic control

P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.

(Lighting)

No

Yes

No

Yes

Yes

No

Yes

No

Yes

No

W

2 Be careful to the residual

voltage of smoothing capacitor.

Be sure to release the failure-mode
recall function after checking.

No

No

Yes

No

Yes

Serial signal error display

Yes

Yes

No

Yes

As for indoor unit, refer to service manual OB371.

Inverter P.C.board
(Parts side)

LED

Blinking

Turn OFF the power supply.

Turn ON the power supply.

Is there 230V AC between
outdoor terminal block S1 and
S2?

Does POWER lamp light
up? <Confirmation of the power to the indoor
unit>

Press EMERGENCY OPERATION switch.

Check the power
supply.

Is the self-check of the indoor unit displayed 6
minutes after?

POWER lamp blinks
quickly.

A

Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not mis-wiring.
Short-circuit outdoor terminal block S2 and
S3.

W

1

B

Turn ON the power supply of the outdoor unit.

Check the wiring.

Make them sure.

Remove the short-circuit between
outdoor terminal block S2 and S3.
Is there amplitude of 10 to 20V DC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>

Is there 230V AC between outdoor
terminal block S1 and S2?
<Confirmation of power voltage>

Replace the indoor electronic control P.C. board.

Replace the inverter
P.C. board.

W

2

Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?

Is there any error of the
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?

Replace the
indoor/outdoor
connecting.

Replace the
indoor/outdoor
connecting.

OB372 --2qxp 05.1.17 15:30 Page 35

Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy

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Summary of Contents for MUZ-FA25VA-E1

Page 1: ...RUCTIONS 39 13 PARTS LIST 42 Wireless type Models No OB372 SPLIT TYPE HEAT PUMP AIR CONDITIONERS MUZ FA25VA MUZ FA35VA MUZ FA25VAH MUZ FA35VAH E1 E1 E1 E1 MUZ FA25VA MUZ FA35VA MUZ FA25VAH MUZ FA35VAH E1 E1 E1 E1 Indication of model name NOTE This service manual describes technical data of the outdoor units As for indoor units MSZ FA25VA and MSZ FA35VA refer to the service manual OB371 E1 E1 HFC u...

Page 2: ...nge MUZ A09YV MUZ FA25VA MUZ A09YVH MUZ FA25VAH E1 E1 E1 E1 MUZ A12YV MUZ FA35VA MUZ A12YVH MUZ FA35VAH E1 E1 E1 E1 1 Indication of capacity has been changed BTU base kW base 2 Control method between indoor and outdoor unit has been changed 3 Power supply method has been changed change to supply from outdoor unit 4 Terminal block for power supply has been added 5 Power P C board has been changed 6...

Page 3: ...p adapter Electronic scale for refrigerant charging No Not Substitutable for R410A Yes Substitutable for R410A No 12 7 mm 1 Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant Some R22 tools can be substituted for R410A tools The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other ref...

Page 4: ... air purging for the purpose of environmental protection 5 Additional charge For additional charging charge the refrigerant from liquid phase of the gas cylinder If the refrigerant is charged from the gas phase composition change may occur in the refrigerant inside the cylinder and the outdoor unit In this case ability of the refrigeration cycle decreases or normal operation can be impossible Howe...

Page 5: ... air purging for the purpose of environmental protection 5 Additional charge For additional charging charge the refrigerant from liquid phase of the gas cylinder If the refrigerant is charged from the gas phase composition change may occur in the refrigerant inside the cylinder and the outdoor unit In this case ability of the refrigeration cycle decreases or normal operation can be impossible Howe...

Page 6: ...Starting current Total 1 Compressor motor current 1 Fan motor current 1 Model Output Winding resistance at 20 Model Winding resistance at 20 Dimensions WOHOD Weight Sound level 1 Fan speed HighW LowW High Med W LowW Fan speed regulator Refrigerant filling capacity R410A Refrigeration oil Model Thermistor RT61 at 0 Thermistor RT62 at 100 Thermistor RT64 at 50 Thermistor RT65 at 25 kW r h K h A A A ...

Page 7: ...CT781 C63A C63B C63C DB61 DB65 F61 F71 F801 H IPM LEV L61 R61 R831 R64A R64B TB1 TB2 X63 X64 X66 21S4 26H MUZ FA25VAH E1 MUZ FA35VA E1 MUZ FA35VAH E1 ETA19Z59BZ ETQ19Z71AY 620 420V D25XB60 250V 20A 250V 3 15A PS21244 A 203 CAD MD12ME 12VDC 10A 23 0mH 25m 5W 5 1 5W 3P G5NB 1a G4A 1A PS STF 01AJ503 230V 130W G5NB 1a Open 45 230V 130W G5NB 1a Open 45 45m 5W 1 element 50m 5W 2 elements Specifications ...

Page 8: ...Wet bulb temperature 6 MUZ FA25VA MUZ FA25VAH E1 E1 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 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE COOLING FUNCTION SPL dB A LINE FAN SPEED HEATING 47 48 Test conditions Cooling Dry bulb temperature 35 Wet bulb t...

Page 9: ... pipe joint Refrigerant pipe flared 9 52 4 3 3 5 2 holes 10X21 Drain hole 33 MUZ FA25 FA35VAH REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit 350mm or more 200mm or more 100mm or more 100mm or more Open two sides of left right or rear side Drain hole 42 MUZ FA25 FA35VA Unit mm OUTDOOR UNIT MUZ FA25VA MUZ FA35VA MUZ FA25VAH MUZ FA35VAH E1 E...

Page 10: ...ric wiring refer to the indoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block Connector MODELS WIRING DIAGRAM MUZ FA25VA MUZ FA35VA E1 E1 N 230V 12 24V 230V 50Hz CIRCUIT BREAKER PE RED BLU WHITE GRN YLW TB1 POWER SUPPLY L N R64A TB2 S3 S1 TO INDDOR UNIT CONNECTING S2 RED BLU WHT R64B WHT NR63 LDE GRN 4 6 2 1 2 3 1 CN...

Page 11: ...ide electric wiring refer to the indoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block Connector MODELS WIRING DIAGRAM PE CIRCUIT BREAKER N 230V 50Hz POWER SUPPLY 230V TO INDDOR UNIT CONNECTING RED BLU WHITE GRN YLW TB1 L N R64A TB2 S1 S2 RED BLU WHT R64B WHT H 26H CT 4 3 NR64 NR63 GRN DSA61 LDE 2 3 1 4 5 CN601 LDY G...

Page 12: ...thermistor RT65 Muffler Muffler Muffler MUZ FA25VA MUZ FA25VAH E1 E1 OUTDOOR UNIT Unit mm Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperatuer thermistor RT62 Flared connection Stop valve with strainar Stop valve with service port Capillary tube 3 0 2 0 240 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe 9 52 with he...

Page 13: ... Refrigerant Piping Max length A w Height difference should be within 12m regardless of which unit indoor or outdoor position is high w Max Height difference 12m Indoor unit Outdoor unit MAX HEIGHT DIFFERENCE MAX REFRIGERANT PIPING LENGTH Refrigerant piping Max length m A 20 Indoor unit Gas 0 43 Liquid 0 5 Gas 9 52 Liquid 6 35 Outdoor unit Piping size O D mm Length of connecting pipe m Model MUZ F...

Page 14: ...b 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 Ope...

Page 15: ... compressor Correction of Heating capacity Capacity correction factors The operational frequency of compressor Correction of Heating total input Input correction factors The operational frequency of compressor Correction of Heating capacity Capacity correction factors The operational frequency of compressor Input correction factors MUZ FA25VA MUZ FA25VAH E1 E1 MUZ FA25VA MUZ FA25VAH E1 E1 MUZ FA25...

Page 16: ...nit current A MUZ FA25VA MUZ FA25VAH E1 E1 2 4 6 8 10 12 14 MUZ FA35VA MUZ FA35VAH E1 E1 E1 E1 MUZ FA35VA MUZ FA35VAH E1 E1 E1 E1 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 Both indoor and outdoor unit are under the same temperature humidity condition Dry bulb temperature Relative humidity 20 50 25 60 30 70 HEAT operation Condition indoor Dry bulb temperature 20 0 C Wet bulb te...

Page 17: ...524 2 60 2 31 0 89 547 28 20 3 06 2 36 0 77 500 2 94 2 26 0 77 530 2 85 2 19 0 77 541 2 75 2 12 0 77 565 28 22 3 19 2 07 0 65 518 3 08 2 00 0 65 550 3 00 1 95 0 65 565 2 88 1 87 0 65 589 28 24 3 35 1 78 0 53 541 3 23 1 71 0 53 571 3 15 1 67 0 53 589 3 05 1 62 0 53 619 28 26 3 45 1 41 0 41 571 3 35 1 37 0 41 601 3 30 1 35 0 41 619 3 20 1 31 0 41 637 29 18 2 94 2 73 0 93 476 2 81 2 62 0 93 500 2 70 ...

Page 18: ... 637 2 23 1 71 0 77 672 28 22 2 73 1 77 0 65 631 2 55 1 66 0 65 666 2 38 1 54 0 65 690 28 24 2 88 1 52 0 53 655 2 70 1 43 0 53 684 2 55 1 35 0 53 714 28 26 3 03 1 24 0 41 678 2 85 1 17 0 41 708 2 68 1 10 0 41 738 29 18 2 45 2 28 0 93 583 2 25 2 09 0 93 619 2 08 1 93 0 93 643 29 20 2 58 2 09 0 81 607 2 40 1 94 0 81 637 2 23 1 80 0 81 672 29 22 2 73 1 88 0 69 631 2 55 1 76 0 69 666 2 38 1 64 0 69 69...

Page 19: ...85 4 11 3 04 0 74 832 3 99 2 95 0 74 851 3 85 2 85 0 74 888 28 22 4 46 2 77 0 62 813 4 31 2 67 0 62 865 4 20 2 60 0 62 888 4 03 2 50 0 62 926 28 24 4 69 2 35 0 50 851 4 52 2 26 0 50 898 4 41 2 21 0 50 926 4 27 2 14 0 50 972 28 26 4 83 1 84 0 38 898 4 69 1 78 0 38 944 4 62 1 76 0 38 972 4 48 1 70 0 38 1000 29 18 4 11 3 70 0 90 748 3 94 3 54 0 90 785 3 78 3 40 0 90 823 3 64 3 28 0 90 860 29 20 4 29 ...

Page 20: ...1000 3 12 2 31 0 74 1057 28 22 3 82 2 37 0 62 991 3 57 2 21 0 62 1047 3 33 2 06 0 62 1085 28 24 4 03 2 01 0 50 1029 3 78 1 89 0 50 1075 3 57 1 79 0 50 1122 28 26 4 24 1 61 0 38 1066 3 99 1 52 0 38 1113 3 75 1 42 0 38 1159 29 18 3 43 3 09 0 90 916 3 15 2 84 0 90 972 2 91 2 61 0 90 1010 29 20 3 61 2 81 0 78 954 3 36 2 62 0 78 1000 3 12 2 43 0 78 1057 29 22 3 82 2 52 0 66 991 3 57 2 36 0 66 1047 3 33...

Page 21: ... Q INPUT Q INPUT Q INPUT 15 2 52 647 3 04 776 3 56 876 4 08 945 4 60 1005 5 08 1035 5 60 1055 21 2 40 697 2 88 826 3 40 915 3 88 985 4 40 1035 4 88 1065 5 38 1104 26 2 16 746 2 68 876 3 16 965 3 68 1035 4 20 1085 4 68 1114 5 20 1144 MSZ FA25VA MUZ FA25VA MUZ FA25VAH Rated frequency 77Hz E1 E1 E1 MSZ FA35VA MUZ FA35VA MUZ FA35VAH Rated frequency 73Hz E1 E1 E1 NOTE Q Total capacity kW INPUT Total po...

Page 22: ...Starting current Total 1 Compressor motor current 1 Fan motor current 1 Model Output Winding resistance at 20 Model Winding resistance at 20 Dimensions WOHOD Weight Sound level 1 Fan speed HighW LowW High Med W LowW Fan speed regulator Refrigerant filling capacity R410A Refrigeration oil Model Thermistor RT61 at 0 Thermistor RT62 at 100 Thermistor RT64 at 50 Thermistor RT65 at 25 kW r h K h A A A ...

Page 23: ...CT781 C63A C63B C63C DB61 DB65 F61 F71 F801 H IPM LEV L61 R61 R831 R64A R64B TB1 TB2 X63 X64 X66 21S4 26H MUZ FA25VAH E1 MUZ FA35VA E1 MUZ FA35VAH E1 ETA19Z59BZ ETQ19Z71AY 620 420V D25XB60 250V 20A 250V 3 15A PS21244 A 203 CAD MD12ME 12VDC 10A 23 0mH 25m 5W 5 1 5W 3P G5NB 1a G4A 1A PS STF 01AJ503 230V 130W G5NB 1a Open 45 230V 130W G5NB 1a Open 45 45m 5W 1 element 50m 5W 2 elements Specifications ...

Page 24: ...Wet bulb temperature 6 MUZ FA25VA MUZ FA25VAH E1 E1 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 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE COOLING FUNCTION SPL dB A LINE FAN SPEED HEATING 47 48 Test conditions Cooling Dry bulb temperature 35 Wet bulb t...

Page 25: ... pipe joint Refrigerant pipe flared 9 52 4 3 3 5 2 holes 10X21 Drain hole 33 MUZ FA25 FA35VAH REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit 350mm or more 200mm or more 100mm or more 100mm or more Open two sides of left right or rear side Drain hole 42 MUZ FA25 FA35VA Unit mm OUTDOOR UNIT MUZ FA25VA MUZ FA35VA MUZ FA25VAH MUZ FA35VAH E1 E...

Page 26: ...ric wiring refer to the indoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block Connector MODELS WIRING DIAGRAM MUZ FA25VA MUZ FA35VA E1 E1 N 230V 12 24V 230V 50Hz CIRCUIT BREAKER PE RED BLU WHITE GRN YLW TB1 POWER SUPPLY L N R64A TB2 S3 S1 TO INDDOR UNIT CONNECTING S2 RED BLU WHT R64B WHT NR63 LDE GRN 4 6 2 1 2 3 1 CN...

Page 27: ...ide electric wiring refer to the indoor unit electric wiring diagram for servicing 2 Use copper conductors only For field wiring 3 Symbols below indicate Terminal block Connector MODELS WIRING DIAGRAM PE CIRCUIT BREAKER N 230V 50Hz POWER SUPPLY 230V TO INDDOR UNIT CONNECTING RED BLU WHITE GRN YLW TB1 L N R64A TB2 S1 S2 RED BLU WHT R64B WHT H 26H CT 4 3 NR64 NR63 GRN DSA61 LDE 2 3 1 4 5 CN601 LDY G...

Page 28: ...thermistor RT65 Muffler Muffler Muffler MUZ FA25VA MUZ FA25VAH E1 E1 OUTDOOR UNIT Unit mm Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperatuer thermistor RT62 Flared connection Stop valve with strainar Stop valve with service port Capillary tube 3 0 2 0 240 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe 9 52 with he...

Page 29: ... Refrigerant Piping Max length A w Height difference should be within 12m regardless of which unit indoor or outdoor position is high w Max Height difference 12m Indoor unit Outdoor unit MAX HEIGHT DIFFERENCE MAX REFRIGERANT PIPING LENGTH Refrigerant piping Max length m A 20 Indoor unit Gas 0 43 Liquid 0 5 Gas 9 52 Liquid 6 35 Outdoor unit Piping size O D mm Length of connecting pipe m Model MUZ F...

Page 30: ...b 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 Ope...

Page 31: ... compressor Correction of Heating capacity Capacity correction factors The operational frequency of compressor Correction of Heating total input Input correction factors The operational frequency of compressor Correction of Heating capacity Capacity correction factors The operational frequency of compressor Input correction factors MUZ FA25VA MUZ FA25VAH E1 E1 MUZ FA25VA MUZ FA25VAH E1 E1 MUZ FA25...

Page 32: ...nit current A MUZ FA25VA MUZ FA25VAH E1 E1 2 4 6 8 10 12 14 MUZ FA35VA MUZ FA35VAH E1 E1 E1 E1 MUZ FA35VA MUZ FA35VAH E1 E1 E1 E1 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 Both indoor and outdoor unit are under the same temperature humidity condition Dry bulb temperature Relative humidity 20 50 25 60 30 70 HEAT operation Condition indoor Dry bulb temperature 20 0 C Wet bulb te...

Page 33: ...524 2 60 2 31 0 89 547 28 20 3 06 2 36 0 77 500 2 94 2 26 0 77 530 2 85 2 19 0 77 541 2 75 2 12 0 77 565 28 22 3 19 2 07 0 65 518 3 08 2 00 0 65 550 3 00 1 95 0 65 565 2 88 1 87 0 65 589 28 24 3 35 1 78 0 53 541 3 23 1 71 0 53 571 3 15 1 67 0 53 589 3 05 1 62 0 53 619 28 26 3 45 1 41 0 41 571 3 35 1 37 0 41 601 3 30 1 35 0 41 619 3 20 1 31 0 41 637 29 18 2 94 2 73 0 93 476 2 81 2 62 0 93 500 2 70 ...

Page 34: ... 637 2 23 1 71 0 77 672 28 22 2 73 1 77 0 65 631 2 55 1 66 0 65 666 2 38 1 54 0 65 690 28 24 2 88 1 52 0 53 655 2 70 1 43 0 53 684 2 55 1 35 0 53 714 28 26 3 03 1 24 0 41 678 2 85 1 17 0 41 708 2 68 1 10 0 41 738 29 18 2 45 2 28 0 93 583 2 25 2 09 0 93 619 2 08 1 93 0 93 643 29 20 2 58 2 09 0 81 607 2 40 1 94 0 81 637 2 23 1 80 0 81 672 29 22 2 73 1 88 0 69 631 2 55 1 76 0 69 666 2 38 1 64 0 69 69...

Page 35: ...85 4 11 3 04 0 74 832 3 99 2 95 0 74 851 3 85 2 85 0 74 888 28 22 4 46 2 77 0 62 813 4 31 2 67 0 62 865 4 20 2 60 0 62 888 4 03 2 50 0 62 926 28 24 4 69 2 35 0 50 851 4 52 2 26 0 50 898 4 41 2 21 0 50 926 4 27 2 14 0 50 972 28 26 4 83 1 84 0 38 898 4 69 1 78 0 38 944 4 62 1 76 0 38 972 4 48 1 70 0 38 1000 29 18 4 11 3 70 0 90 748 3 94 3 54 0 90 785 3 78 3 40 0 90 823 3 64 3 28 0 90 860 29 20 4 29 ...

Page 36: ...1000 3 12 2 31 0 74 1057 28 22 3 82 2 37 0 62 991 3 57 2 21 0 62 1047 3 33 2 06 0 62 1085 28 24 4 03 2 01 0 50 1029 3 78 1 89 0 50 1075 3 57 1 79 0 50 1122 28 26 4 24 1 61 0 38 1066 3 99 1 52 0 38 1113 3 75 1 42 0 38 1159 29 18 3 43 3 09 0 90 916 3 15 2 84 0 90 972 2 91 2 61 0 90 1010 29 20 3 61 2 81 0 78 954 3 36 2 62 0 78 1000 3 12 2 43 0 78 1057 29 22 3 82 2 52 0 66 991 3 57 2 36 0 66 1047 3 33...

Page 37: ... Q INPUT Q INPUT Q INPUT 15 2 52 647 3 04 776 3 56 876 4 08 945 4 60 1005 5 08 1035 5 60 1055 21 2 40 697 2 88 826 3 40 915 3 88 985 4 40 1035 4 88 1065 5 38 1104 26 2 16 746 2 68 876 3 16 965 3 68 1035 4 20 1085 4 68 1114 5 20 1144 MSZ FA25VA MUZ FA25VA MUZ FA25VAH Rated frequency 77Hz E1 E1 E1 MSZ FA35VA MUZ FA35VA MUZ FA35VAH Rated frequency 73Hz E1 E1 E1 NOTE Q Total capacity kW INPUT Total po...

Page 38: ...l Sensor Actuator 9 3 Relation between main sensor and actuator 9 2 R V coil control Heating ON Cooling OFF Dry OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor ON OFF ON OFF Outdoor fan motor Compressor 5 seconds 15 seconds ON OFF Compressor Outdoor fan motor R V coil ON OFF ON OFF COOL 5 seconds HEAT 5 seconds ON or OFF ON or OFF 9 1 Outdoor fan motor contr...

Page 39: ... troubleshooting refer to 11 2 11 3 and 11 4 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 mis wiring 2 Take care 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 horizon...

Page 40: ...ycles W2 Turn ON the power supply 1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button 2 First release RESET button And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds Deleting the abnormal condition 1After repairing the unit recall the failure mo...

Page 41: ...ed abnormal condition is deleted 3Release the failure mode recall function according to Releasing the failure mode recall function mentioned above Repair the defective parts Confirmation of abnormality presence W1 With the remote controller headed towards the indoor unit press TOO COOL or TOO WARM button to adjust the set temperature to 25 The outdoor unit is normal Releasing the failure mode reca...

Page 42: ...de When defrost thermistor exceeds 70 in COOL mode When temperature of fin temperature thermistor on the inverter P C board exceeds 83 MUZ FA25VA MUZ FA25VAH 82 MUZ FA35VA MUZ FA35VAH or temperature of P C board temperature thermistor exceeds 85 MUZ FA25VA MUZ FA25VAH 81 MUZ FA35VA MUZ FA35VAH When outdoor fan has stopped within 30 seconds 3 times in a row after outdoor fan start up unit stops Whe...

Page 43: ...t Trouble of thermistor in outdoor unit POWER lamp 7 time flash Cause Outdoor unit Trouble of outdoor control system Refer to 11 6 o How to check of mis wiring and serial signal error when outdoor unit doesn t work All lamps Flash on and off at 0 5 second intervals Cause Indoor unit The horizontal vane is not installed correctly Refer to Check of installation of the horizontal vane Check room temp...

Page 44: ...Low discharge temperature protection Check stop valve Reconnect connector of compressor Refer to 11 6 A How to check inverter compressor Refer to 11 6 C Check of intelligent power module Refer to 11 6 G Check of outdoor thermistors Check stop valve Reconnect connector of compressor Refer to 11 6 A How to check inverter compressor Refer to 11 6 C Check of intelligent power module Replace inverter P...

Page 45: ...to warm it up Part temperature 0 C 40 C Normal 150 k 600 k 30 k 180 k Abnormal Open or short circuit Normal 5 k 55 k Abnormal Open or short circuit Defrost thermistor RT61 Fin temperature thermistor RT64 Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Part temperature 0 C 40 C Normal Abnormal Open or short circuit Ambient temperature thermi...

Page 46: ...HT RED RED WHT Judgement Infinite Normal 0 dozens of Abnormal short Output voltage V 115V w Measure AC voltage between the lead wires at 3 points ohmmeter indication Normal infinite Abnormal 0 dozens of X1 X1 LED Inverter P C board Parts side 9 time flash 2 5 second OFF Flashing Check of open phase B Check of intelligent power module C How to check inverter compressor A When POWER lamp flashes 5 t...

Page 47: ...current Judgement For reference 0 10 seconds Abnormal compressor short or poor contact 10 60 seconds Abnormal compressor lock out 60 seconds 5 minutes Abnormal refrigerant circuit defect more than 5 minutes Normal w Measure the resistance between the lead wires at 3 points Outdoor fan starts Abnormal Compressor winding short or layer short Compressor connector poor contact Abnormal Compressor lock...

Page 48: ...nt temperature thermistor RT65 Check of R V coil H Disconnect connector CN61 between the compressor and intelligent power module Turn ON the power supply and press EMERGENCY OPERATION switch twice HEAT mode Is there 230V AC between CN7211 and 2 on the power P C board 3 minutes after the power supply is turned ON Yes No Replace the power P C board Replace the 4 way valve Disconnect connector CN61 b...

Page 49: ...isconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press EMERGENCY OPERATION switch Check the electric parts in main circuit Ok If flash refer to 11 4 Is there voltage 280V 370V DC between DB61 and DB61 on the inverter P C board Refer to 11 7 1 Dose LED on the inverter P C board light up or flash Refer to 11 7 1 Outdoor terminal block S3 S2 S1 Yes...

Page 50: ...ance of LEV have the characteristics Refer to 11 5 Measure each voltage between connector pins of CN724 on the inverter P C board 1 Pin3 Pin1 2 Pin4 Pin1 3 Pin5 Pin1 4 Pin6 Pin1 Is there about 3 5V AC between each NOTE Measure the voltage by an analog tester No Yes Yes Yes No Replace the expansion valve Yes No No Properly fix the LEV to the expansion valve Replace the inverter P C board NOTE After...

Page 51: ...resistance of defrost heater normal Refer to 11 5 3 Does the heater protector remain conducted not open 4 Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors 26H CN726 CN722 H 2 1 2 1 2 3 Outdoor base gets frozen MUZ FA25VAH MUZ FA35VAH Check of inverter P C board N Outdoor fan motor does not operate or stops immediately after starting up Yes 10 t...

Page 52: ...rial signal error display Yes Yes No Yes As for indoor unit refer to service manual OB371 Inverter P C board Parts side LED Blinking Turn OFF the power supply Turn ON the power supply Is there 230V AC between outdoor terminal block S1 and S2 Does POWER lamp light up Confirmation of the power to the indoor unit Press EMERGENCY OPERATION switch Check the power supply Is the self check of the indoor ...

Page 53: ...tioner indoor outdoor wiring grounding wire antennas wiring from antennas receiver 5 Electric field intensity of the broadcast station affected by the electromagnetic noise 6 Presence or absence of amplifier such as booster 7 Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for...

Page 54: ...an motor CN932 Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 230V AC DB61 Connecting wire with power P C board CN725 Jumper wire for change in defrost setting JS Front side of unit DB61 280V 370V DC Smoothing capacitor C63C Smoothing capacitor C63A Smoothing capacitor C63...

Page 55: ...MUZ FA25VAH MUZ FA35VAH MUZ FA25VA MUZ FA35VA MUZ FA25VAH MUZ FA35VAH E1 E1 E1 E1 Front side of unit Connecting wire with inverter P C board CN726 Refer to 11 6 M 230V AC Varistor NR63 Varistor NR62 Varistor NR64 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 56: ...nism 1Slide the sleeve 2Pull the terminal while pushing the locking lever 1Hold the sleeve and pull out the terminal slowly The terminal which has the locking mechanism can be detached as shown below There are two types Refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching Te...

Page 57: ...ter P C board CN931 CN932 Fan motor CN641 Defrost thermistor and discharge temperature thermistor CN643 Ambient temperature thermistor CN724 LEV 4 Remove the compressor connector CN61 5 Remove the screws fixing the relay panel See Photo 3 6 Remove the inverter assembly See Photo 3 7 Disconnect all connectors and lead wires on the inverter P C board See Photo 4 8 Remove the inverter P C board from ...

Page 58: ...lve 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connecting wire and remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 5 Detach the welded part of the suction and the discharge pipe connecte...

Page 59: ... PARTS AND FUNCTIONAL PARTS 1 11 12 2 18 20 13 10 9 MUZ FA25VA MUZ FA35VA MUZ FA25VAH MUZ FA35VAH E1 E1 E1 E1 3 4 5 6 7 8 19 17 23 21 22 24 16 15 14 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 60: ...1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 Symbol in Wiring Diagram Q ty unit Remarks Part No No Part Name MUZ FA25VA E1 MUZ FA35VA E1 MUZ FA25VAH E1 MUZ FA35VAH E1 CABINET GRILLE PROPELLER BASE BASE COMPRESSOR COMPRESSOR COMPRESSOR RUBBER SET STOP VALVE GAS STOP VALVE LIQUID SERVICE PANEL BACK PANEL EXPANSION VALVE EXPANSION VALVE COIL 4 WAY VALVE THERMO HOLDER THERMO HOLDER CONDENSER WIRE NET CONDE...

Page 61: ...7 8 9 10 11 12 Symbol in Wiring Diagram Q ty unit DEFROST DISCHARGE 250V 20A 3P 3P Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 250V 3 15A Remarks Part No No Part Name L61 21S4 RT61 RT62 RT65 F61 TB1 TB2 F71 F801 NR62 NR63 NR64 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 MUZ F...

Page 62: ...ing Diagram Remarks Parts No Parts Name E02 927 113 E02 927 115 E02 927 112 2 3 4 BRUSH NOZZLE UNIVERSAL ADAPTER No Q ty unit 1 1 1 1 1 1 1 1 1 1 1 1 MUZ FA25VA E1 MUZ FA25VAH E1 MUZ FA35VA E1 MUZ FA35VAH E1 2 4 3 MUZ FA25VA MUZ FA35VA MUZ FA25VAH MUZ FA35VAH E1 E1 E1 E1 You can clean the surface of the heat exchanger and line flow fan if you attach QUICK CLEAN KIT to your vacuum cleaner Mitsubish...

Page 63: ...46 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 64: ...47 Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

Page 65: ...C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jan 2005 No OB372 6 Made in Japan New publication effective Jan 2005 Specifications subject to change without notice Mitsubishi ilmalämpöpumput huoltaa ja korjaa Jäähdytinpalvelu RefGroup Oy www ilmalämpöpumput com ...

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