Mitsubishi Electric MUZ-HJ25VA-E1 Page 1 Service Manual Download | Manualshive

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 6
6. WIRING DIAGRAM ············································ 7
7. REFRIGERANT SYSTEM DIAGRAM ··············· 8
8. PERFORMANCE CURVES ······························· 9
9. ACTUATOR CONTROL ··································· 18

10. SERVICE FUNCTIONS ···································· 19
11. TROUBLESHOOTING ····································· 19
12. DISASSEMBLY INSTRUCTIONS ···················· 33

Models

SPLIT-TYPE AIR CONDITIONERS

MUZ-HJ25VA

-

E1

MUZ-HJ35VA

-

E1

HFC

utilized

R410A

No. OBH648

OUTDOOR UNIT

Indoor unit service manual
MSZ-HJ•VA Series (OBH647)

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

PARTS CATALOG (OBB648)

MUZ-HJ25VA

MUZ-HJ35VA

1
2
3
...
»

Summary of Contents for MUZ-HJ25VA-E1

Page 1: ...GRAM 8 8 PERFORMANCE CURVES 9 9 ACTUATOR CONTROL 18 10 SERVICE FUNCTIONS 19 11 TROUBLESHOOTING 19 12 DISASSEMBLY INSTRUCTIONS 33 Models SPLIT TYPE AIR CONDITIONERS MUZ HJ25VA E1 MUZ HJ35VA E1 HFC utilized R410A No OBH648 OUTDOOR UNIT Indoor unit service manual MSZ HJ VA Series OBH647 NOTE RoHS compliant products have G mark on the spec name plate PARTS CATALOG OBB648 MUZ HJ25VA MUZ HJ35VA ...

Page 2: ...h the refrigerant Do not touch the hot or cold areas in the refrigeration cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live 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 o...

Page 3: ...Z HJ25VA E1 MUZ HJ35VA E1 1 New model 1 TECHNICAL CHANGES ACCESSORIES Air outlet Drain outlet Piping Drain hose Air inlet Back and side MUZ HJ25VA MUZ HJ35VA Drain socket 1 2 PART NAMES AND FUNCTIONS OBH648 ...

Page 4: ...ng h 0 4 0 6 Air flow 1 m3 h 1 890 1 890 Sound level 1 Cooling dB A 50 50 Heating 50 50 Fan speed rpm 840 840 Fan speed regulator 1 1 Refrigerant filling capacity R410A kg 0 70 0 72 NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C Outdoor Dry bulb temperature 35 C Heating Indoor Dry bulb temperature 20 C Outdoor Dry bulb temperature 7 C ...

Page 5: ...G 50 50 MUZ HJ25VA 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 HEATING 50 50 Test conditions Cooling Dry bulb temperature 35 C Heating Dry bulb temperature 7 C Wet bulb temperatu...

Page 6: ...ore 200 mm or more 41 5 270 3 157 7 4 3 4 0 102 7 13 5 538 Air in Air in Air out 349 5 55 7 121 4 249 17 9 699 500 121 259 Bolt pitch for installation 294 267 285 19 6 Liquid refrigerant pipe joint Refrigerant pipe flared ø6 35 Gas refrigerant pipe joint Refrigerant pipe flared ø9 52 Drain hole ø33 2 10 3 X 19 3 Oval hole OBH648 ...

Page 7: ...7 MUZ HJ25VA 6 WIRING DIAGRAM MUZ HJ35VA OBH648 ...

Page 8: ...5 only 7 REFRIGERANT SYSTEM DIAGRAM MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping m Piping size O D mm Max Length A Max Height difference B Gas Liquid MUZ HJ25VA MUZ HJ35VA 20 12 9 52 6 35 Max Length A Max Height difference B Indoor unit Outdoor unit ADDITIONAL REFRIGERANT CHARGE R410A g Model Outdoor unit precharged Refrigerant piping length one way 5 m 6 m 7 m 8 m 9 ...

Page 9: ...re and the indoor outlet air wet and dry bulb temperature for your reference at service Cooling Heating MUZ HJ25VA MUZ HJ35VA How to measure the indoor air wet and dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers mus...

Page 10: ...e C Outdoor intake air Dry bulb temperature C MUZ HJ25VA at Rated frequency MUZ HJ35VA at Rated frequency 6 1 5 6 5 1 4 6 4 1 3 6 6 8 6 2 5 6 5 1 4 5 4 0 18 20 25 30 35 46 45 40 0 8 0 9 1 0 1 1 1 2 1 3 Total input cooling Input correction factor 22 20 18 Indoor intake air Wet bulb temperature C 26 24 8 1 CAPACITY AND INPUT CURVES Indoor air Wet bulb temperature difference C Outdoor intake air Dry ...

Page 11: ... 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 MUZ HJ25VA MUZ HJ35VA Hz Hz Hz Hz Hz Hz Hz Hz 8 2 CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR 8 3 HOW TO OPERATE FIXED FREQUENCY...

Page 12: ...e same tempera ture humidity condition Operation TEST RUN OPERATION Refer to 8 3 8 4 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT Condition Operation Test run operation refer to 8 3 HEAT operation NOTE The unit of pressure has been changed to MPa on the international system of units SI unit system The conversion factor is 1 MPa Gauge 10 2 kgf cm2 Gauge Dry bulb temperature C Relative humidity 20 ...

Page 13: ... 723 27 24 3 35 1 98 0 59 664 3 23 1 90 0 59 701 3 15 1 86 0 59 723 3 05 1 80 0 59 759 27 26 3 45 1 62 0 47 701 3 35 1 57 0 47 737 3 30 1 55 0 47 759 3 20 1 50 0 47 781 28 18 2 94 2 91 0 99 584 2 81 2 78 0 99 613 2 70 2 67 0 99 642 2 60 2 57 0 99 672 28 20 3 06 2 66 0 87 613 2 94 2 56 0 87 650 2 85 2 48 0 87 664 2 75 2 39 0 87 694 28 22 3 19 2 39 0 75 635 3 08 2 31 0 75 675 3 00 2 25 0 75 694 2 88...

Page 14: ... 818 2 38 1 69 0 71 847 27 24 2 88 1 70 0 59 803 2 70 1 59 0 59 839 2 55 1 50 0 59 876 27 26 3 03 1 42 0 47 832 2 85 1 34 0 47 869 2 68 1 26 0 47 905 28 18 2 45 2 43 0 99 715 2 25 2 23 0 99 759 2 08 2 05 0 99 788 28 20 2 58 2 24 0 87 745 2 40 2 09 0 87 781 2 23 1 94 0 87 825 28 22 2 73 2 04 0 75 774 2 55 1 91 0 75 818 2 38 1 78 0 75 847 28 24 2 88 1 81 0 63 803 2 70 1 70 0 63 839 2 55 1 61 0 63 87...

Page 15: ...4 4 22 2 41 0 57 946 4 06 2 32 0 57 998 3 97 2 26 0 57 1030 3 84 2 19 0 57 1082 27 26 4 35 1 96 0 45 998 4 22 1 90 0 45 1050 4 16 1 87 0 45 1082 4 03 1 81 0 45 1113 28 18 3 70 3 59 0 97 832 3 54 3 44 0 97 874 3 40 3 30 0 97 915 3 28 3 18 0 97 957 28 20 3 86 3 28 0 85 874 3 70 3 15 0 85 926 3 59 3 05 0 85 946 3 47 2 95 0 85 988 28 22 4 02 2 93 0 73 905 3 87 2 83 0 73 962 3 78 2 76 0 73 988 3 62 2 6...

Page 16: ... 2 99 2 06 0 69 1206 27 24 3 62 2 06 0 57 1144 3 40 1 94 0 57 1196 3 21 1 83 0 57 1248 27 26 3 81 1 72 0 45 1186 3 59 1 62 0 45 1238 3 37 1 52 0 45 1290 28 18 3 09 2 99 0 97 1019 2 84 2 75 0 97 1082 2 61 2 54 0 97 1123 28 20 3 24 2 76 0 85 1061 3 02 2 57 0 85 1113 2 80 2 38 0 85 1175 28 22 3 43 2 51 0 73 1102 3 21 2 35 0 73 1165 2 99 2 18 0 73 1206 28 24 3 62 2 21 0 61 1144 3 40 2 08 0 61 1196 3 2...

Page 17: ...966 26 1 70 653 2 11 766 2 49 844 2 90 905 3 31 948 3 69 974 4 10 1001 MUZ HJ35VA CAPACITY 3 6 kW INPUT 995 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 2 27 647 2 74 776 3 20 876 3 67 945 4 14 1005 4 57 1035 5 04 1055 21 2 16 697 2 59 826 3 06 915 3 49 985 3 96 1035 4 39 1065 4 84 1104 26 1 94 746 2 41 876 2 84 965 3 31 1035 3 78 1085 4 2...

Page 18: ...cking with the compressor ON The fan motor turns ON 5 seconds before the compressor 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 Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost...

Page 19: ...MUZ HJ25VA MUZ HJ35VA 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 tempera ture The pre heat control prevents this interference The pre heat control turns ON when outside temperature is 20 C or below When pre heat control is turned ON compressor is energized About 50 W JK When the JK wire...

Page 20: ... The indoor unit is abnormal Check the blinking pattern and identify the abnormal point with the indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least two 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 but...

Page 21: ...ck the blinking pattern and identify the abnormal point with the out door unit failure mode table 11 2 3 Make sure to check at least two 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 o...

Page 22: ... 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 100 C or less 3 minutes later Check refrigerant circuit and refrigerant amount Refer to 11 5 Check of LEV 6 time flash 2 5 seconds OFF High pressure Temperature indoor coil thermistor exceeds 70 C in HEAT mode Temperature defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrigerant am...

Page 23: ...C in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 12 8 time flash 2 5 seconds OFF Compressor syn chronous abnormal ity The waveform of compressor current is distorted Reconnect connector of compressor Refer to 11 5 How to check in verter compressor 13 12 time flash 2 5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected n...

Page 24: ...resistance between the terminals with a tester Part temperature 10 40 C Normal U V U W V W MUZ HJ25VA MUZ HJ35VA 2 01 2 86 Ω 1 20 1 72 Ω Outdoor fan motor MF INNER FUSE RA6V21 AB 152 0 5 C CUT OFF RA6V21 BB 126 2 CUT OFF Measure the resistance between the terminals with a tester Part temperature 10 40 C Color of lead wire Normal RA6V21 AB RA6V21 BB BD WHT BLK 305 374 Ω 222 272 Ω BLK RED 247 304 Ω ...

Page 25: ...the balance of voltage 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 switch on the indoor unit TEST RUN OPERA TION Refer to 8 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...

Page 26: ...al open NOTE Be sure to zero the ohmmeter before measurement Measure the resistance between the lead wires at 3 points Connect the compressor and activate the inverter Then measure the time until the inverter stops due to over current 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...

Page 27: ...voltage between DB61 and on the inverter P C board Voltage between outdoor terminal block S1 S2 Is the thermistor normal Refer to 11 6 1 Reconnect the connector of thermistor Turn ON the power supply and press EMERGENCY OPERATION switch No Replace the thermistor except RT64 When RT64 is abnormal replace the inverter P C board Does the unit operate for 10 minutes or more without showing thermistor ...

Page 28: ...s HEAT mode even if it is set to COOL mode Disconnect connector CN61 between the compressor and the power module Turn ON the power supply and press EMERGENCY OPERATION switch twice HEAT mode Disconnect connector CN61 between the compressor and the power module Turn ON the power supply and press EMERGENCY OPERATION switch once COOL mode Check the resistance of fan motor Refer to 11 4 Is the resista...

Page 29: ...el the expansion valve vibrate on touching it Turn ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button Hold down the other two buttons for another 3 seconds Make sure that the indicators on the LCD screen shown in the right figure are all disp...

Page 30: ... on the inverter P C board repeat 3 6 second OFF and 0 8 second ON quick blinking for 3 minutes after the outdoor unit is energized Check the blinking pattern within 3 minutes after LED is turned on Af ter 3 minutes LED will blink 6 times whether the inverter P C board is normal or not No Replace the indoor inverter P C board 2 Yes A 2 Be careful of 140 VDC 280 VDC residual charge in the capacitor...

Page 31: ...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 32: ...Resistance kΩ 1 Inverter P C board MUZ HJ25VA MUZ HJ35VA 11 6 TEST POINT DIAGRAM AND VOLTAGE Back side of unit Fin temperature thermistor RT64 CN642 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 230 VAC Jumper wire for changing defrost setting JS Front side of unit DB61 250 V 370 VDC Output to drive compressor LDW LDV LDU LED Fuse F801 T3 15AL250V Jumper wire for pre he...

Page 33: ...the top panel Screws of the top panel 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this 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 Terminal with locking mechanism Detaching points The terminal which has the locking mechan...

Page 34: ...he terminal block support 7 Remove the screw of the terminal block and remove the terminal block 8 Remove the heat sink support from the P C board support 9 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 1 2 Disconnect the following connectors Inverter P C board CN721 R V c...

Page 35: ...ve the fan motor 6 Removing the compressor and the 4 way valve 1 Remove the cabinet and the panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Remove the screws of the reactor and remove the reactor 4 Remove the screws of the separator and remove the separator 5 Remove the terminal cover and the compressor lead wire 6 Recover gas from the refrigerant circuit NOTE Recover gas from the pi...

Page 36: ... ELECTRIC CORPORATION Distributed in Dec 2012 No OBH648 Made in Japan New publication effective Dec 2012 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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