Mitsubishi MUZ-HC25VA Service Manual

Split-type air conditioners

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SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Models

MUZ-HC25VA -

MUZ-HC35VA -

MUZ-HC35VAB -

NOTE:

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

Revision B:

• MUZ-HC35VA-

been added.

Please void OBH467 REVISED EDITION-A.

HFC

utilized

R410A

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

PARTS CATALOG (OBB467)

and MUZ-HC35VAB-

No. OBH467

REVISED EDITION-B

Indoor unit service manual

MSZ-HC•VA Series (OBH466)

MSZ-CHC•VA Series (OBH522)

have

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Summary of Contents for Mitsubishi MUZ-HC25VA

Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS Please void OBH467 REVISED EDITION-A. OUTDOOR UNIT No. OBH467 SERVICE MANUAL REVISED EDITION-B utilized R410A Models MUZ-HC25VA - MUZ-HC35VA - MUZ-HC35VA - MUZ-HC35VAB - MUZ-HC35VAB - Indoor unit service manual MSZ-HC•VA Series (OBH466) MSZ-CHC•VA Series (OBH522) CONTENTS 1.
Page 2: Revision B
Revision A: •Table “ADDITIONAL REFRIGERANT CHARGE” of “7. REFRIGERANT SYSTEM DIAGRAM ” has been corrected. Revision B: • MUZ-HC35VA- and MUZ-HC35VAB- have been added.
Page 3: Technical Changes
TECHNICAL CHANGES → MUZ-HC25VA - MUZ-HA25VA - → MUZ-HC35VA - MUZ-HA35VA - → MUZ-HC35VAB - MUZ-HA35VA - 1. Outdoor model has been changed. → MUZ-HC35VA - MUZ-HC35VA - → MUZ-HC35VAB - MUZ-HC35VAB - 1. REFRIGERANT SYSTEM has been changed.
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Air inlet Piping Drain hose Air outlet Drain outlet ACCESSORIES Drain socket...
Page 5: Specification
SPECIFICATION Outdoor model MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Function Cooling Heating Cooling Heating Cooling Heating Power supply Single phase 230 V, 50 Hz Capacity 3.15 Rated frequency (Min.-Max.) (0.9-3.0) (0.9-4.4) (1.0-3.7) (0.9-4.8) (1.0-3.7) (0.9-4.8) Breaker capacity Running current 1 (Total) Power input 1 (Total)
Page 6 Speciﬁ cations and rating conditions of main electric parts MUZ-HC25 Model MUZ-HC35VA- MUZ-HC35VA- Item MUZ-HC35VAB- MUZ-HC35VAB- Current transformer (CT) 20 A 500 μF 420 V Smoothing capacitor (C61, C62) Diode module (DB61) 15 A 600 V (DB65) 10 A 600 V Fuse (F61) T20AL250V...
Page 7: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-HC25VA MUZ-HC35VA FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) LINE COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR NC-20 HEARING FOR NC-20 CONTINUOUS CONTINUOUS NOISE...
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Unit : mm REQUIRED SPACE Basically open 100 mm or more without any obstruction in front and on both sides of the unit. 381.5 Air in Air in Open two sides of left, right, or rear side.
Page 9: Wiring Diagram
WIRING DIAGRAM MUZ-HC25VA MUZ-HC35VA- MUZ-HC35VAB-...
Page 10 MUZ-HC35VA- MUZ-HC35VAB-...
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-HC25VA MUZ-HC35VA- MUZ-HC35VAB- Unit : mm 4-way valve Refrigerant pipe ø9.52 (with heat insulator) Muffler Stop valve (with service port) Outdoor Muffler Discharge heat Flared connection exchanger temperature thermistor RT62 Compressor Defrost thermistor RT61 Capillary tube Strainer ø...
Page 12 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: m Piping size O.D: mm Max. Length Max. Height difference Liquid MUZ-HC25VA MUZ-HC35VA 9.52 6.35 MUZ-HC35VAB Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A : g)
Page 13: Performance Curves
PERFORMANCE CURVES MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi- tions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
Page 14 8-1. CAPACITY AND INPUT CURVES Cooling capacity 10.8 Outdoor intake air Dry-bulb temperature (°C) Total input (cooling) 18 20 Outdoor intake air Dry-bulb temperature (°C) 20.5 22.4 22.4 20.7 20.7 18.9 19.0 19.0 17.4 17.2 15.8 17.2 14.2 15.5 15.5 13.8 13.8 12.6...
Page 15 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-HC25VA Correction of Heating total input Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity 150(Hz) 150(Hz) 150(Hz) 150(Hz) The operational frequency of compressor The operational frequency of compressor...
Page 16: Cool Operation
COOL operation Dry-bulb temperature (°C) Relative humidity (%) Both indoor and outdoor unit are under the same tempera- ture/humidity condition. Operation: TEST RUN OPERATION (Refer to 8-3.) Outdoor low pressure MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB 35(°C) 35(°C) 35(°C) Ambient temperature (°C) Ambient temperature (°C) Ambient temperature (°C)
Page 17 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HC25VA CAPACITY: 2.5 kW SHF: 0.79 INPUT: 770 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.94 1.79 0.61...
Page 18 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HC25VA CAPACITY: 2.5 kW SHF: 0.79 INPUT: 770 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 2.45 1.49 0.61 2.25 1.37 0.61...
Page 19 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HC35VA CAPACITY: 3.15 kW SHF: 0.76 INPUT: 980 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.70 2.15 0.58 3.54 2.06...
Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HC35VA CAPACITY: 3.15 kW SHF: 0.76 INPUT: 980 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.09 1.79 0.58 2.84 1.64 0.58 1019 2.61...
Page 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HC35VAB CAPACITY: 3.4 kW SHF: 0.76 INPUT: 1130 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.00 2.32 0.58 3.83 2.22...
Page 22 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-HC35VAB CAPACITY: 3.4 kW SHF: 0.76 INPUT: 1130 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 3.33 1.93 0.58 1107 3.06 1.77 0.58 1175...
Page 23 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-HC25VA CAPACITY: 3.2 kW INPUT: 880 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.02 2.43 2.85 3.26 3.68 4.06 4.48 1.92 2.30 2.72 3.10 3.52 3.90 4.30...
Page 24: Actuator Control
ACTUATOR CONTROL MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB 9-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking 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.
Page 25: Service Functions
SERVICE FUNCTIONS MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB 10-1. CHANGE IN DEFROST SETTING <JS> When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-6-1.) Jumper wire Defrost ﬁ nish temperature (°C) Soldered...
Page 26: Failure Mode Recall Function
11-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (11-3.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
Page 27 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Conﬁ rm if outdoor unit is abnormal according to the following procedures. Conﬁ rm that the remote controller is in the failure mode recall function. 1.
Page 28 3. Outdoor unit failure mode table The upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Correspondence failure mode INDICTOR (Failure mode / protection) (Outdoor P.C. board) mode recall recall function lamp (Indoor function unit) None (Normal) —...
Page 29: Troubleshooting Check Table
11-3. TROUBLESHOOTING CHECK TABLE Abnormal point / Symptom LED indication Condition Correspondence Condition Outdoor unit 1-time ﬂ ash every Outdoor power sys- Over current protection stop is continuously performed 3 times • Reconnect connector of compres- does not oper- 2.5 seconds within 1 minute after the compressor gets started, or failure of sor.
Page 30 11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Part name Check method and criterion Figure Measure the resistance with a tester. Defrost thermistor (RT61) Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, the chart of thermistor.
Page 31 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). See 11-5. “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor.
Page 32 C Check of compressor Refer to 11-5. “Check of compressor winding”. Replace the compressor. Is the compressor normal? Refer to 11-5. “Check of compressor operation time”. Refer to 11-5. “Check of compressor start failure”. Does the compressor operate continuously? D Check of compressor winding ●...
Page 33 F Check of compressor start failure Conﬁ rm that is normal. •Electrical circuit check . Contact of the compressor connector (Including CN61) . Output voltage of inverter P.C. board and balance of them (See 11-5. ) . Direct current voltage between DB61(+) and (-) on the inverter P.C. board .
Page 34 H Check of R.V. coil 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 not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V.
Page 35 J Check of power supply Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press Rectify indoor/outdoor connecting wire. EMERGENCY OPERATION switch. Is there voltage 230 VAC Replace the indoor Does the upper lamp of OPERATION between the indoor terminal electronic control P.C.
Page 36 K How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
Page 37 L Check of LEV (Expansion valve) 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. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds.
Page 38 M Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit.
Page 39 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Smoothing capacitor Fuse Smoothing capacitor Varistor Varistor (C62) (F801) (C61) (NR62) (NR61) 230V AC Varistor Back side of unit DB61 (NR63) DB61 280 V ~ 370 V...
Page 40: Disassembly Instructions
Locking lever lever. Connector 12-1. MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing cabinet and panels Photo 1 (1) Remove the screw fixing the service panel. (Photo 2) (2) Pull down the service panel and remove it.
Page 41 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. Photo 3 Screws of the board relay panel (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the earth wires (Photo 3), the lead wire to the reactor and the following connectors; Screw of <Inverter P.C.
Page 42 OPERATING PROCEDURE PHOTOS Photo 6 5. Removing outdoor fan motor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the connectors for outdoor fan motor. (3) Remove the propeller nut. (Photo 7) (4) Remove the propeller. (Photo 7) (5) Remove the screws fixing the fan motor.
Page 44 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2007 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 New publication, effective Aug. 2008 Distributed in Jan. 2007. No. OBH467 6 Specifications subject to change without notice.

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Muz-hc35vab Muz-hc35va

Mitsubishi MUZ-HC25VA Service Manual

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