Revision B: • MUZ-HC35VAbeen added. SPLIT-TYPE AIR CONDITIONERS E2 and MUZ-HC35VAB- E2 have Please void OBH467 REVISED EDITION-A. OUTDOOR UNIT SERVICE MANUAL HFC utilized No. OBH467 REVISED EDITION-B R410A Models MUZ-HC25VA MUZ-HC35VA MUZ-HC35VA MUZ-HC35VAB MUZ-HC35VAB - E1 E1 E2 E1 E2 Indoor unit service manual MSZ-HC•VA Series (OBH466) MSZ-CHC•VA Series (OBH522) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 4 3.
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.
1 TECHNICAL CHANGES MUZ-HA25VA - E1 MUZ-HA35VA - E1 MUZ-HA35VA - E1 → MUZ-HC25VA - E1 → MUZ-HC35VA - 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.
2 PART NAMES AND FUNCTIONS MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Air inlet Piping Drain hose Air outlet Drain outlet ACCESSORIES Drain socket 1 4
3 SPECIFICATION Electrical data Outdoor model Function Power supply Capacity kW Rated frequency (Min.-Max.) Breaker capacity A Running current 1 (Total) A Power input 1 (Total) W % Power factor 1 (Total) A Starting current 1 (Total) Coefficient of performance (C.O.P) 1 (Total) Model MUZ-HC25VA Cooling Heating 2.5 (0.9-3.0) 3.2 (0.9-4.4) 3.7 770 90 4.2 880 91 4.2 3.25 3.
Specifications and rating conditions of main electric parts Model Item Current transformer Smoothing capacitor Diode module Fuse MUZ-HC25 MUZ-HC35VA- E1 MUZ-HC35VAB- E1 (CT) MUZ-HC35VA- E2 MUZ-HC35VAB- E2 20 A 500 μF 420 V (C61, C62) (DB61) 15 A 600 V (DB65) 10 A 600 V (F61) T20AL250V (F701, F801) T3.
4 NOISE CRITERIA CURVES MUZ-HC35VA MUZ-HC25VA FUNCTION SPL(dB(A)) FUNCTION SPL(dB(A)) COOLING 46 LINE COOLING 47 HEATING 47 HEATING 48 90 OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
5 OUTLINES AND DIMENSIONS MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Unit : mm REQUIRED SPACE 100 381.5 mm ore or m mm 0 0 1 or m ore Air in ore 300 Bolt pitch for installation 264-280 Drain hole ø33 47.5 Air in 100 22.5 2 holes 10 × 16 m 255 Service panel 20.8 17.5 Handle 43° 40° 10 144.6 89.6 Liquid refrigerant pipe joint Refrigerant pipe (flared) ø6.35 540 270 rm mo Open two sides of left, right, or rear side.
6 WIRING DIAGRAM MUZ-HC25VA MUZ-HC35VA- E1 MUZ-HC35VAB- E1 9
MUZ-HC35VA- E2 MUZ-HC35VAB- E2 10
7 REFRIGERANT SYSTEM DIAGRAM MUZ-HC25VA MUZ-HC35VA- E1 MUZ-HC35VAB- E1 Unit : mm 4-way valve Refrigerant pipe ø9.52 (with heat insulator) Muffler Stop valve (with service port) Discharge temperature thermistor RT62 Flared connection Outdoor heat exchanger Muffler Compressor Defrost thermistor RT61 Capillary tube ø3.0 × ø1.4 × 450 (HC25) ø3.0 × ø1.4 × 235 (HC35) Flared connection Refrigerant pipe ø6.35 (with heat insulator) Check valve Stop valve (with strainer) Strainer R.V.
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 10 5 9.52 6.35 MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB Indoor unit Max. Height difference B Max.
8 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 conditions 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. (1) GUARANTEED VOLTAGE 198 ~ 264 V, 50 Hz (2) AIR FLOW Air flow should be set at MAX.
7.3 9.0 9.9 6.7 8.3 9.1 6.1 7.5 8.2 5.5 6.8 7.4 5.0 6.1 6.7 4.4 5.4 5.9 7.4 5.0 6.1 6.7 4.4 5.4 5.9 3.9 4.8 5.2 20.5 22.4 22.4 18.9 20.7 20.7 17.4 19.0 19.0 15.8 17.2 17.2 14.2 15.5 15.5 12.6 13.8 13.8 11.0 12.1 12.1 9.5 10.3 10.3 1.4 1.3 26 1.2 Indo or in 1.1 take 24 air W et-bu lb te 1.0 mpe ratu 20 22 20 18 re (° C) 0.9 18 Input correction factor 8.2 6.8 MUZ-HC35VAB at Rated frequency 7.5 5.5 MUZ-HC35VAB at Rated frequency 6.
8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-HC25VA Correction of Cooling total input Capacity correction factors Input correction factors Capacity correction factors 1.0 1.0 0.5 0.5 Correction of Heating total input 2.0 Correction of Heating capacity 2.0 1.5 Input correction factors Correction of Cooling capacity 1.5 1.5 1.0 0.5 1.5 1.0 0.5 0.0 0.0 0.0 0.
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Dry-bulb temperature (°C) 20 25 30 Both indoor and outdoor unit are under the same temperature/humidity condition. Operation: TEST RUN OPERATION (Refer to 8-3.) Relative humidity (%) 50 60 70 Outdoor low pressure 8 0.8 6 12 10 1.2 1.0 8 0.8 0.6 6 4 0.4 2 0.2 15 14 12 10 MPa [Gauge] 1.0 14 MUZ-HC35VAB 1.4 kgf/cm2 [Gauge] 10 1.
PERFORMANCE DATA COOL operation at Rated frequency MUZ-HC25VA CAPACITY: 2.5 kW INDOOR INDOOR DB (°C) WB (°C) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 SHF: 0.79 Q SHC 2.94 1.79 3.06 1.50 2.94 1.91 3.06 1.62 3.19 1.31 2.94 2.03 3.06 1.
PERFORMANCE DATA COOL operation at Rated frequency MUZ-HC25VA CAPACITY: 2.5 kW INDOOR INDOOR DB (°C) WB (°C) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 SHF: 0.79 Q SHC 2.45 1.49 2.58 1.26 2.45 1.59 2.58 1.36 2.73 1.12 2.45 1.69 2.58 1.
PERFORMANCE DATA COOL operation at Rated frequency MUZ-HC35VA CAPACITY: 3.15 kW INDOOR INDOOR DB (°C) WB (°C) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 SHF: 0.76 Q SHC 3.70 2.15 3.86 1.78 3.70 2.29 3.86 1.93 4.02 1.53 3.70 2.44 3.86 2.
PERFORMANCE DATA COOL operation at Rated frequency MUZ-HC35VA CAPACITY: 3.15 kW INDOOR INDOOR DB (°C) WB (°C) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 SHF: 0.76 Q SHC 3.09 1.79 3.24 1.49 3.09 1.91 3.24 1.62 3.43 1.30 3.09 2.04 3.24 1.
PERFORMANCE DATA COOL operation at Rated frequency MUZ-HC35VAB CAPACITY: 3.4 kW INDOOR INDOOR DB (°C) WB (°C) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 SHF: 0.76 Q SHC 4.00 2.32 4.17 1.92 4.00 2.48 4.17 2.08 4.34 1.65 4.00 2.64 4.17 2.
PERFORMANCE DATA COOL operation at Rated frequency MUZ-HC35VAB CAPACITY: 3.4 kW INDOOR INDOOR DB (°C) WB (°C) 21 21 22 22 22 23 23 23 24 24 24 24 25 25 25 25 26 26 26 26 26 27 27 27 27 27 28 28 28 28 28 29 29 29 29 29 30 30 30 30 30 31 31 31 31 31 32 32 32 32 32 NOTE 18 20 18 20 22 18 20 22 18 20 22 24 18 20 22 24 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 18 20 22 24 26 SHF: 0.76 Q SHC 3.33 1.93 3.50 1.61 3.33 2.07 3.50 1.75 3.71 1.41 3.33 2.20 3.50 1.
PERFORMANCE DATA HEAT operation at Rated frequency MUZ-HC25VA CAPACITY: 3.2 kW INDOOR DB (°C) 15 21 26 -10 Q INPUT 2.02 572 1.92 616 1.73 660 INPUT: 880 W -5 Q INPUT 2.43 686 2.30 730 2.14 774 OUTDOOR WB (°C) 0 5 10 Q INPUT Q INPUT Q INPUT 2.85 774 3.26 836 3.68 889 2.72 810 3.10 871 3.52 915 2.53 854 2.94 915 3.36 959 Q 4.06 3.90 3.74 15 INPUT 915 942 986 Q 4.48 4.30 4.16 20 INPUT 933 977 1012 OUTDOOR WB (°C) 0 5 10 Q INPUT Q INPUT Q INPUT 3.20 876 3.67 945 4.14 1005 3.06 915 3.49 985 3.96 1035 2.
9 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. 5 seconds 15 seconds ON Compressor OFF ON Outdoor fan motor OFF 9-2. R.V. COIL CONTROL Heating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . . . OFF Dry . . . . . . . . . . . . .
10 SERVICE FUNCTIONS MUZ-HC25VA MUZ-HC35VA MUZ-HC35VAB 10-1. CHANGE IN DEFROST SETTING When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-6-1.) JS Jumper wire Soldered (Initial setting) Defrost finish temperature (°C) 5 None (Cut) 8 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.
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. 1.
2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confirm if outdoor unit is abnormal according to the following procedures. Confirm that the remote controller is in the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 25°C. 1 Does the upper lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.
3. Outdoor unit failure mode table The upper lamp of OPERATION Abnormal point INDICTOR (Failure mode / protection) lamp (Indoor unit) OFF None (Normal) LED indication (Outdoor P.C. board) — 2-time flash 2.5 seconds OFF Outdoor power system 3-time flash 2.5 seconds OFF Discharge temperature thermistor Defrost thermistor 1-time flash every 2.5 seconds Fin temperature thermistor 3-time flash 2.5 seconds OFF 4-time flash 2.5 seconds OFF 11-time flash 2.5 seconds OFF 4-time flash 2.5 seconds OFF — P.
11-3. TROUBLESHOOTING CHECK TABLE No. 1 Abnormal point / Condition Outdoor unit 1-time flash every Outdoor power sysdoes not oper- 2.5 seconds tem ate. Symptom LED indication 2 3 6-time flash 2.5 seconds OFF 11-time flash 2.5 seconds OFF 14-time flash 2.5 seconds OFF 4 5 6 8 ‘Outdoor unit 2-time flash 2.5 stops and seconds OFF restarts 3 minutes later’ is repeated. 3-time flash 2.5 seconds OFF 9 4-time flash 2.5 seconds OFF 10 5-time flash 2.5 seconds OFF 11 8-time flash 2.
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. Measure the resistance with a tester. Discharge temperature Before measurement, hold the thermistor with your hands to warm it thermistor (RT62) up. Fin temperature thermistor (RT64) Refer to 11-6.
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 the voltage between terminals. Are the voltages balanced? Yes Check the compressor. No “Check of open phase”. Replace the inverter P.C. board. See 11-5. “Check of compressor”.
C Check of compressor Refer to 11-5. “Check of compressor winding”. Is the compressor normal? Yes Refer to 11-5. “Check of compressor operation time”. Does the compressor operate continuously? Yes No No Replace the compressor. Refer to 11-5. “Check of compressor start failure”. OK. D Check of compressor winding ● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals.
F Check of compressor start failure Confirm 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 . Voltage between outdoor terminal block S1-S2 Does the compressor run for 10 seconds or more after it starts? Yes Check the refrigerant circuit. Check the stop valve.
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. coil. Check if CN721 is connected. Unit operates COOL mode even if it is set to HEAT mode. Disconnect connector (CN61) between the compressor and the intelligent power module.
J Check of power supply Disconnect the connector (CN61) between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Does the upper lamp of OPERATION INDICATOR lamp on the indoor unit light up? Yes Is there voltage 280 - 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. Rectify indoor/outdoor connecting wire.
K How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. No Yes Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes Check the wiring. No Press EMERGENCY OPERATION switch once.
L Check of LEV (Expansion valve) Turn ON the power supply. 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.
M Electromagnetic noise enters into TV sets or radios Is the unit earthed? Yes Is the distance between the antennas and the indoor unit within 3 m, or is the distance between the antennas and the outdoor unit within 3 m? No Earth the unit. No Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit.
11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C.
12 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> 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. (1) Slide the sleeve and check if there is a locking lever or not.
OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (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; CN641 (Defrost thermistor and discharge temperature thermistor) CN721 (4-way valve) CN771 (Fan motor) (3) (4) (5) (6) Screws of the relay panel Screw of the earth wires Disconnect the compressor connector (CN61).
OPERATING PROCEDURE PHOTOS Photo 6 5. Removing outdoor fan motor (1) (2) (3) (4) (5) (6) Remove the cabinet and panels. (Refer to 1.) Disconnect the connectors for outdoor fan motor. Remove the propeller nut. (Photo 7) Remove the propeller. (Photo 7) Remove the screws fixing the fan motor. (Photo 7) Remove the fan motor. 6. Removing the compressor and 4-way valve (1) Remove the cabinet and panels. (Refer to 1.) (2) Remove the inverter assembly. (Refer to 2.) (3) Recover gas from the refrigerant circuit.
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 Distributed in Jan. 2007. No. OBH467 6 Made in Japan New publication, effective Aug. 2008 Specifications subject to change without notice.
