Mitsubishi MUZ-HC25VA Service Manual Download Page 1

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4

3. SPECIFICATION ················································ 5

4. NOISE CRITERIA CURVES ······························ 7

5. OUTLINES AND DIMENSIONS ························ 8

6. WIRING DIAGRAM ············································ 9

7. REFRIGERANT SYSTEM DIAGRAM ··············11

8. PERFORMANCE CURVES ····························· 13

9. ACTUATOR CONTROL ··································· 24

10. SERVICE FUNCTIONS ···································· 25

11. TROUBLESHOOTING ····································· 25

12. DISASSEMBLY INSTRUCTIONS ···················· 40

Models

SPLIT-TYPE AIR CONDITIONERS

MUZ-HC25VA -

MUZ-HC35VA -

MUZ-HC35VAB -

HFC

utilized

R410A

No. OBH467

REVISED EDITION-B

OUTDOOR UNIT

Indoor unit service manual
MSZ-HC•VA Series (OBH466)
MSZ-CHC•VA Series (OBH522)

NOTE:

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

PARTS CATALOG (OBB467)

Revision B:

• MUZ-HC35VA-

and MUZ-HC35VAB-

have

been added.

Please void OBH467 REVISED EDITION-A.

Summary of Contents for MUZ-HC25VA

Page 1: ...OUBLESHOOTING 25 12 DISASSEMBLY INSTRUCTIONS 40 Models SPLIT TYPE AIR CONDITIONERS MUZ HC25VA E1 MUZ HC35VA E1 MUZ HC35VA E2 MUZ HC35VAB E1 MUZ HC35VAB E2 HFC utilized R410A No OBH467 REVISED EDITION...

Page 2: ...2 Revision A Table ADDITIONAL REFRIGERANT CHARGE of 7 REFRIGERANT SYSTEM DIAGRAM has been corrected Revision B MUZ HC35VA E2 and MUZ HC35VAB E2 have been added...

Page 3: ...Z HC25VA E1 MUZ HA35VA E1 MUZ HC35VA E1 MUZ HA35VA E1 MUZ HC35VAB E1 1 Outdoor model has been changed MUZ HC35VA E1 MUZ HC35VA E2 MUZ HC35VAB E1 MUZ HC35VAB E2 1 REFRIGERANT SYSTEM has been changed 1...

Page 4: ...4 ACCESSORIES Air outlet Drain outlet Piping Drain hose Air inlet MUZ HC25VA MUZ HC35VA MUZ HC35VAB Drain socket 1 2 PART NAMES AND FUNCTIONS...

Page 5: ...DH E2 KNB073FGDHC Output W 500 550 Current 1 A 3 24 3 74 4 34 4 34 4 84 4 34 Fan motor Model RA6V21 AB or BB or BD Current 1 A 0 24 Dimensions W H D mm 684 540 255 Weight kg 25 Special remarks Dehumid...

Page 6: ...A 600 V Fuse F61 T20AL250V F701 F801 T3 15AL250V Intelligent power module IPM 10 A 600 V Expansion valve coil LEV DC 12 V Reactor L61 18 mH 7 A Current detecting resistor R61 45 m 5 W R825 25 m 5 W C...

Page 7: ...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 47 48 Test conditions Cooling Dry bulb temperature...

Page 8: ...00 mm or more without any obstruction in front and on both sides of the unit 350 mm or more 100 mm or more 100 mm or more 100 mm or more Open two sides of left right or rear side Air in Air in 381 5 D...

Page 9: ...9 MUZ HC25VA MUZ HC35VA E1 MUZ HC35VAB E1 6 WIRING DIAGRAM...

Page 10: ...10 MUZ HC35VA E2 MUZ HC35VAB E2...

Page 11: ...heck valve Capillary tube 3 0 1 4 450 HC25 3 0 1 4 235 HC35 3 0 1 4 800 HC25 3 0 1 4 600 HC35 MUZ HC25VA MUZ HC35VA E1 MUZ HC35VAB E1 MUZ HC35VA E2 MUZ HC35VAB E2 Outdoor heat exchanger Flared connect...

Page 12: ...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 m 10 m MUZ HC25VA MUZ...

Page 13: ...erature and the indoor outlet air wet dry bulb temperature for your reference at service Cooling Heating MUZ HC25VA MUZ HC35VA MUZ HC35VAB How to measure the indoor air wet bulb dry bulb temperature d...

Page 14: ...take air Dry bulb temperature C MUZ HC25VA MUZ HC35VAB at Rated frequency at Rated frequency MUZ HC35VA at Rated frequency 6 7 6 1 5 5 5 0 4 4 3 9 8 3 7 5 6 8 6 1 5 4 4 8 9 1 8 2 7 4 6 7 5 9 5 2 18 20...

Page 15: ...The operational frequency of compressor Correction of Heating capacity Capacity correction factors The operational frequency of compressor Input correction factors MUZ HC25VA MUZ HC35VA Correction of...

Page 16: ...0 35 C 0 2 0 4 0 6 0 8 1 0 1 2 1 4 kgf cm 2 Gauge MPa Gauge 2 4 6 8 10 12 14 A A A Ambient temperature C Ambient temperature C MUZ HC25VA MUZ HC35VA Ambient temperature C MUZ HC35VAB 3 0 2 5 2 0 1 5 1...

Page 17: ...61 762 27 24 3 35 1 64 0 49 701 3 23 1 58 0 49 739 3 15 1 54 0 49 762 3 05 1 49 0 49 801 27 26 3 45 1 28 0 37 739 3 35 1 24 0 37 778 3 30 1 22 0 37 801 3 20 1 18 0 37 824 28 18 2 94 2 61 0 89 616 2 8...

Page 18: ...61 862 2 38 1 45 0 61 893 27 24 2 88 1 41 0 49 847 2 70 1 32 0 49 886 2 55 1 25 0 49 924 27 26 3 03 1 12 0 37 878 2 85 1 05 0 37 916 2 68 0 99 0 37 955 28 18 2 45 2 18 0 89 755 2 25 2 00 0 89 801 2 0...

Page 19: ...0 27 24 4 22 1 94 0 46 892 4 06 1 87 0 46 941 3 97 1 83 0 46 970 3 84 1 77 0 46 1019 27 26 4 35 1 48 0 34 941 4 22 1 44 0 34 990 4 16 1 41 0 34 1019 4 03 1 37 0 34 1049 28 18 3 70 3 18 0 86 784 3 54 3...

Page 20: ...8 2 99 1 74 0 58 1137 27 24 3 62 1 67 0 46 1078 3 40 1 56 0 46 1127 3 21 1 48 0 46 1176 27 26 3 81 1 30 0 34 1117 3 59 1 22 0 34 1166 3 37 1 15 0 34 1215 28 18 3 09 2 65 0 86 960 2 84 2 44 0 86 1019 2...

Page 21: ...24 4 56 2 10 0 46 1028 4 39 2 02 0 46 1085 4 28 1 97 0 46 1119 4 15 1 91 0 46 1175 27 26 4 69 1 60 0 34 1085 4 56 1 55 0 34 1141 4 49 1 53 0 34 1175 4 35 1 48 0 34 1209 28 18 4 00 3 44 0 86 904 3 83...

Page 22: ...66 3 23 1 87 0 58 1311 27 24 3 91 1 80 0 46 1243 3 67 1 69 0 46 1300 3 47 1 60 0 46 1356 27 26 4 11 1 40 0 34 1288 3 88 1 32 0 34 1345 3 64 1 24 0 34 1401 28 18 3 33 2 87 0 86 1107 3 06 2 63 0 86 1175...

Page 23: ...26 1 73 660 2 14 774 2 53 854 2 94 915 3 36 959 3 74 986 4 16 1012 MUZ HC35VA MUZ HC35VAB 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...

Page 24: ...ing 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 SE...

Page 25: ...ane 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 boar...

Page 26: ...abnormal Check the blinking pattern and confirm 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 cyc...

Page 27: ...eck the blinking pattern and confirm 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...

Page 28: ...seconds OFF High pressure Temperature of indoor coil thermistor exceeds 70 C in HEAT mode When defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop...

Page 29: ...en the defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 11 8 time flash 2 5 seconds OFF Compressor synchro nous abnormality The waveform...

Page 30: ...he resistance between the terminals with a tester Part temperature 10 40 C Normal U V U W V W MUZ HC25 MUZ HC35 1 65 2 03 1 49 1 84 Outdoor fan motor MF INNER FUSE RA6V21 AB 152 0 5 C CUT OFF RA6V21 B...

Page 31: ...by measuring 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 EMER...

Page 32: ...e Abnormal 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 un...

Page 33: ...rent 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 su...

Page 34: ...de even if it is set to COOL mode Disconnect connector CN61 between the compressor and the intelligent power module Turn ON the power supply and press EMERGENCY OPERATION switch twice HEAT mode Discon...

Page 35: ...TOR lamp on the indoor unit light up Dose 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 280 370 VDC between DB61 and DB61 on the in...

Page 36: ...n OFF the power supply Remove the short circuit between out door terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between indoor terminal block S2 and S3 Confirmati...

Page 37: ...easure the voltage 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 th...

Page 38: ...r the 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...

Page 39: ...C board MUZ HC25VA MUZ HC35VA MUZ HC35VAB 11 6 TEST POINT DIAGRAM AND VOLTAGE Back side of unit Output to drive outdoor fan motor CN771 Fin temperature thermistor RT64 CN642 Discharge temperature ther...

Page 40: ...cabinet Photo 2 Screw of the service panel Direction to remove Hooks Service panel Screws of the top panel Screws of the top panel 1 Slide the sleeve and check if there is a locking lever or not 2 The...

Page 41: ...relay panel Photo 3 5 Remove the inverter assembly See Photo 4 6 Remove the inverter P C board from the inverter assembly 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Remove the R...

Page 42: ...e cabinet 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 pres sure gauge shows 0 MPa 0 kg cm2 4 De...

Page 43: ...43...

Page 44: ...007 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Aug 2008 No OBH467 REVISED EDITION B 6 Distributed in Mar 2007 No OBH467 REVISED EDITION A 6 Distributed in Jan 2007 No OBH467 6 Made in Japan...

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