Service manual

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················5

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

11. DISASSEMBLY INSTRUCTIONS·····················44

12. PARTS LIST······················································48

Wireless type

Models

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA -

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA -

Indication of

model name

HFC

utilized

R410A

No. OB389

NOTE:

This service manual describes technical data of the outdoor units.

•As for indoor units MSZ-GA50VA - , MSZ-GA60VA - and MSZ-GA71VA - , refer to

the service manual OB388.

E1E1E1

OB389 --1qxp 05.1.26 18:14 Page 1

Summary of content (52 pages)

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OB389 --1qxp 05.1.26 18:14 Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS HFC utilized SERVICE MANUAL R410A No. OB389 Wireless type Models MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA - E1 E1 E1 CONTENTS Indication of model name MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA - E1 E1 E1 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3. SPECIFICATION·················································5 4. NOISE CRITERIA CURVES ·······························7 5.
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OB389 --1qxp 05.1.26 18:14 Page 2 1 TECHNICAL CHANGES MUZ-A18YV - E1 MUZ-A24YV - E1 MUZ-A26YV - E1 ➔ MUZ-GA50VA - E1 ➔ MUZ-GA60VA - E1 ➔ MUZ-GA71VA - E1 1.Indication of capacity has been changed.(BTU base ➔ kW base) 2.Outdoor electronic control P.C. board has been changed. 3.Noise filter P.C. board has been changed. 4.Length of fan motor lead wire been changed. 5.Shape of relay panel has been changed. 6.Signal of terminal block has been changed.
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OB389 --1qxp 05.1.26 18:14 Page 3 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) 4.0 Saturated liquid pressure 3.5 R410A 3.0 R22 2.5 2.0 NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system). 1.5 1.0 f [Gauge]) The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f 0.5 0.0 -0.5 -30 -20 -10 0 10 20 30 40 50 60 (:) 1.
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OB389 --1qxp 05.1.26 18:14 Page 4 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. Dimension of flare nut Pipe diameter mm R410A R22 6.35 17 17 9.52 22 22 12.7 26 24 15.88 29 27 3.Refrigerant oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces. 4.Air purge • Do not discharge the refrigerant into the atmosphere.
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OB389 --1qxp 05.1.26 18:14 Page 5 2 PART NAMES AND FUNCTIONS MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 OUTDOOR UNIT ACCESSORIES Air inlet (back and side) MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA - Piping Drain hose 1 Drain socket 1 2 Drain cap [33 2 E1 E1 E1 Air outlet Drain outlet 3 SPECIFICATION Outdoor model Function Capacity Power supply Special remarks Fan motor Compressor Electrical data Capacity Rated frequency(Min.-Max.
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OB389 --1qxp 05.1.26 18:14 Page 6 Specifications and rating conditions of main electric parts OUTDOOR UNIT Model Item Smoothing capacitor MUZ-GA50VA - MUZ-GA60VA - E1 (CB1,2,3) (CT1,2) ETQ19Z68AY Current transformer (CT61) ETQ19Z53AY Fuse (F64) 250V 2A Fuse (F801) 250V 3.
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OB389 --1qxp 05.1.26 18:14 Page 7 4 NOISE CRITERIA CURVES MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 FAN SPEED FUNCTION SPL(dB(A)) COOLING 53 HEATING 55 LINE High OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
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OB389 --1qxp 05.1.
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SYMBOL CB1~3 CT1, 2 CT61 F64 F801 F911 HC930 IPM L LEV PE NOISE FILTER P.C.BOARD GRN/YLW N S3 RED BLU WHT NF GRN LDE1 SYMBOL MC MF NF NR64 PFC R64A,B R937A, B RS1~4 RT61 RT62 CT61 F64 1 2 X64 TAB4 CN901 1 2 3 5 NR64 3 1 ELECTRONIC 1 2 3 5 CONTROL CN781 P.C.
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SYMBOL CB1~3 CT1, 2 CT61 F64 F801 F911 HC930 HPS IPM L LEV PE NOISE FILTER P.C.BOARD S3 RED BLU WHT NAME SMOOTHING CAPACITOR CURRENT TRANSFORMER CURRENT TRANSFORMER FUSE (T2AL 250V) FUSE (T3.
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OB389 --1qxp 05.1.26 18:14 Page 11 7 REFRIGERANT SYSTEM DIAGRAM MUZ-GA50VA - E1 MUZ-GA60VA - E1 OUTDOOR UNIT Unit:mm Refrigerant pipe [12.7 (MUZ-GA50VA) Muffler (with heat insulator) [15.
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OB389 --1qxp 05.1.26 18:14 Page 12 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Model Piping size O.D : mm Max. length : m Gas A MUZ-GA50VA - E1 MUZ-GA71VA - E1 Liquid Indoor unit 6.35 Gas 0.43 Gas 0 Liquid 0.5 Liquid 0 Outdoor unit 12.7 E1 MUZ-GA60VA - Length of connecting pipe : m 30 15.88 9.52 MAX. HEIGHT DIFFERENCE Indoor unit w Max. Height difference 15m Refrigerant Piping Max.
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OB389 --1qxp 05.1.26 18:14 Page 13 8 PERFORMANCE CURVES MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 The standard data contained in these 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.
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24.1 23.4 27.9 22.3 21.6 25.7 23.6 18.5 18.0 21.4 16.7 16.2 19.3 14.8 14.4 17.2 13.0 12.6 15.0 11.1 10.8 12.9 MSZ-GA71VA - E1 MUZ-GA71VA - E1 Rated frequency 66Hz 19.8 MSZ-GA60VA - E1 MUZ-GA60VA - E1 Rated frequency 96Hz 20.4 MSZ-GA50VA - E1 MUZ-GA50VA - E1 Rated frequency 81Hz MUZ-GA50VA - ure e tak D air te MUZ-GA50VA - E1 Correction of Cooling total input 100 150 (Hz) MUZ-GA50VA - E1 1.0 0.5 0 50 100 1.5 1.0 0.5 150 (Hz) 0 50 100 1.0 0.
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OB389 --1qxp 05.1.26 18:14 Page 15 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 1. Press EMERGENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor starts at fixed-frequency. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts. 6.
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OB389 --1qxp 05.1.26 18:14 Page 16 HEAT operation Condition indoor: Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Condition outdoor: Dry bulb temperature 2,7,15,20.0°C Wet bulb temperature 1,6,12,14.5°C MUZ-GA50VA - Operational frequency : 58Hz E1 10.0 Outdoor unit current (A) 9.0 8.0 58Hz 7.0 6.0 5.0 4.0 2 5 10 15 20 25(:) Ambient temperature(˚C) MUZ-GA60VA - E1 MUZ-GA71VA - 16.0 12.0 15.0 11.0 Outdoor unit current (A) Outdoor unit current (A) 58Hz 14.0 10.0 58Hz 13.
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OB389 --1qxp 05.1.26 18:14 Page 17 PERFORMANCE DATA COOL operation Rated frequency 71Hz MSZ-GA50VA - E1 : MUZ-GA50VA - E1 CAPACITY:5.0(kW) INPUT:1460(W) 21 Q SHC SHF INPUT 18 5.88 3.23 0.55 1168 20 6.13 2.63 0.43 1226 18 5.88 3.47 0.59 1168 20 6.13 2.88 0.47 1226 22 6.38 2.23 0.35 1270 18 5.88 3.70 0.63 1168 20 6.13 3.12 0.51 1226 22 6.38 2.49 0.39 1270 18 5.88 3.94 0.67 1168 20 6.13 3.37 0.55 1226 22 6.38 2.74 0.43 1270 24 6.70 2.08 0.31 1329 18 5.88 4.17 0.71 1168 20 6.13 3.61 0.59 1226 22 6.38 3.
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OB389 --1qxp 05.1.26 18:14 Page 18 PERFORMANCE DATA COOL operation Rated frequency 71Hz MSZ-GA50VA - E1 : MUZ-GA50VA - E1 CAPACITY:5.0(kW) INPUT:1460(W) 35 Q SHC SHF INPUT 18 4.90 2.70 0.55 1431 20 5.15 2.21 0.43 1489 18 4.90 2.89 0.59 1431 20 5.15 2.42 0.47 1489 22 5.45 1.91 0.35 1548 18 4.90 3.09 0.63 1431 20 5.15 2.63 0.51 1489 22 5.45 2.13 0.39 1548 18 4.90 3.28 0.67 1431 20 5.15 2.83 0.55 1489 22 5.45 2.34 0.43 1548 24 5.75 1.78 0.31 1606 18 4.90 3.48 0.71 1431 20 5.15 3.04 0.59 1489 22 5.45 2.
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OB389 --1qxp 05.1.26 18:14 Page 19 PERFORMANCE DATA COOL operation Rated frequency 87Hz MSZ-GA60VA - E1 : MUZ-GA60VA - E1 CAPACITY:6.0(kW) INPUT:1930(W) 21 Q SHC SHF INPUT 18 7.05 4.30 0.61 1544 20 7.35 3.60 0.49 1621 18 7.05 4.58 0.65 1544 20 7.35 3.90 0.53 1621 22 7.65 3.14 0.41 1679 18 7.05 4.86 0.69 1544 20 7.35 4.19 0.57 1621 22 7.65 3.44 0.45 1679 18 7.05 5.15 0.73 1544 20 7.35 4.48 0.61 1621 22 7.65 3.75 0.49 1679 24 8.04 2.97 0.37 1756 18 7.05 5.43 0.77 1544 20 7.35 4.78 0.65 1621 22 7.65 4.
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OB389 --1qxp 05.1.26 18:14 Page 20 PERFORMANCE DATA COOL operation Rated frequency 87Hz MSZ-GA60VA - E1 : MUZ-G60VA - E1 CAPACITY:6.0(kW) INDOOR INDOOR DB (:) WB (:) 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 Q 5.88 6.18 5.88 6.18 6.54 5.
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OB389 --1qxp 05.1.26 18:14 Page 21 PERFORMANCE DATA COOL operation Rated frequency 62Hz MSZ-GA71VA - E1 : MUZ-GA71VA - E1 CAPACITY:7.1(kW) INPUT:2420(W) 21 Q SHC SHF INPUT 18 8.34 4.42 0.53 1936 20 8.70 3.57 0.41 2033 18 8.34 4.76 0.57 1936 20 8.70 3.91 0.45 2033 22 9.05 2.99 0.33 2105 18 8.34 5.09 0.61 1936 20 8.70 4.26 0.49 2033 22 9.05 3.35 0.37 2105 18 8.34 5.42 0.65 1936 20 8.70 4.61 0.53 2033 22 9.05 3.71 0.41 2105 24 9.51 2.76 0.29 2202 18 8.34 5.76 0.69 1936 20 8.70 4.96 0.57 2033 22 9.05 4.
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OB389 --1qxp 05.1.26 18:14 Page 22 PERFORMANCE DATA COOL operation Rated frequency 62Hz MSZ-GA71VA - E1 : MUZ-GA71VA - E1 CAPACITY:7.1(kW) INDOOR INDOOR DB (:) WB (:) 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 Q 6.96 7.31 6.96 7.31 7.74 6.
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OB389 --1qxp 05.1.26 18:14 Page 23 PERFORMANCE DATA HEAT operation MSZ-GA50VA - E1 : MUZ-GA50VA - E1 CAPACITY:5.9(kW) Rated frequency 81Hz INPUT:1630(W) OUTDOOR WB(:) INDOOR -10 -5 0 5 10 15 20 DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 3.72 1060 4.48 1271 5.25 1434 6.02 1549 6.79 1646 7.49 1695 8.26 1728 21 3.54 1141 4.25 1353 5.02 1500 5.72 1614 6.49 1695 7.20 1744 7.94 1809 26 3.19 1223 3.95 1434 4.66 1581 5.43 1695 6.20 1777 6.90 1826 7.
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OB389 --1qxp 05.1.26 18:14 Page 24 9 ACTUATOR CONTROL MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 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 OFF 9-2. R.V. coil control Heating . . . . . Cooling. . . . . . Dry . . . . . . . . .
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OB389 --1qxp 05.1.26 18:14 Page 25 10 TROUBLESHOOTING MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 10-1. 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.
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OB389 --1qxp 05.1.26 18:14 Page 26 10-2. 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 (10-4.) 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.
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OB389 --1qxp 05.1.26 18:14 Page 27 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure There is a possibility that the outdoor unit is abnormal. Confirm the presence of abnormality according to the following procedures. Confirm that the remote controller is in the failure mode recall function. W1 With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 25:. W1.
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OB389 --1qxp 05.1.26 18:14 Page 28 3. Failure mode table With outdoor failure mode recall function, you can check the following failures. With indoor/outdoor failure mode recall function, however, you can check the failures marked with " " only.
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OB389 --1qxp 05.1.26 18:14 Page 29 Abnormal point Indoor operation (Failure mode) indicator lamp OFF Normal 11-time flash Converter Details of abnormal point Communication error between P.C. boards Communication between P.C.
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OB389 --1qxp 05.1.26 18:14 Page 30 10-3. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. w Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit operates, when EMERGENCY OPERATION switch is pressed. Unit doesn't operate normal operation in COOL or HEAT mode. Outdoor unit doesn't operate even in Test Run operation. w Indoor unit doesn't receive the signal from remote controller.
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OB389 --2qxp 05.1.26 18:15 Page 31 10-4. Troubleshooting check table Outdoor electronic control P.C. board(Parts side) LED2 LED1 NOTE 1. The location of LED is illustrated at the right figure. 2. LED lights up during normal operation. Lighting Symptom: Outdoor unit does not operate.
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OB389 --2qxp 05.1.26 18:15 Page 32 Symptom: Outdoor unit does not operate normally. Indication LED1 LED2 Once Lighting Twice Lighting Abnormal point Detecting method Primary current protection Secondary current protection When the input current exceeds 15A. When the current of the compressor exceeds 15A. High-pressure protection When the indoor gas pipe temperature exceeds 45: during heating. Defrosting in cooling When the indoor gas pipe temperature falls 3: or below during cooling.
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OB389 --2qxp 05.1.26 18:15 Page 33 10-5. Trouble criterion of main parts MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 Part name Check method and criterion Defrost thermistor/ Ambient temperature thermistor/ Outdoor heat exchanger temperature thermistor Discharge temperature thermistor Measure the resistance using a tester. (Part temperature : -10°C ~ 40°C) Normal 5kΩ ~ 55kΩ abnormal Open or short-circuit Measure the resistance using a tester, after warming up the thermistor by holding by hand.
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OB389 --2qxp 05.1.26 18:15 Page 34 10-6. Troubleshooting flow Outdoor unit does not operate. (LED display: display OFF) A Check of power supply Start Check the connecting of parts of main power supply circuit. Turn on power supply. Is there voltage of 230V AC in the power supply terminal block? No Check the power supply cable. Yes Is the output voltage from the noise filter P.C. board 230V AC? No Is fuse (F64) blown? No Yes Yes Is the input voltage to the power board 230V AC? Replace the fuse.
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OB389 --2qxp 05.1.26 18:15 Page 35 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. B How to check mis-wiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply. Is there rated voltage of 230V AC in the power supply? No Check the power supply. Yes Turn ON the power supply.
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OB389 --2qxp 05.1.26 18:15 Page 36 The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) C Check of R.V. coil • When heating operation does not work. Start 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode. Is there voltage of 230V AC between pin1 and pin 2 at connector CN912? W No Yes Turn off power supply of indoor and outdoor unit.
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OB389 --2qxp 05.1.26 18:15 Page 37 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit get warm. D Check of LEV LED display: LED1 Lighting 6 time Start LED2 Lighting Goes out Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Yes Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? Normal No Yes Disconnect the connector CN795.
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OB389 --2qxp 05.1.26 18:15 Page 38 • When OPERATION INDICATOR lamp flashes 6-time. • When thermistor is abnormal. (When the LED display is a table below.) F Check of outdoor thermistors Start Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board Yes (see below table), and measure the resistance of thermistor. Is the thermistor normal? Replace the thermistor. No Reconnect the connector CN661 on the outdoor electronic control P.C.
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OB389 --2qxp 05.1.26 18:15 Page 39 • When the operation frequency does not go up from lowest frequency. H Check of HPS MUZ-GA71VA Start 1. Disconnect the connector CN681 in the electronic control P.C. board. 2. Check the resistance of HPS after 1 minutes have passed since the outdoor unit power supply was turned off. Infinity Check the resistance between each terminal. Replace HPS. 0" Reconnect CN681. Turn on power supply to the indoor and outdoor unit. 3 minutes later, starts EMERGENCY OPERATION.
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OB389 --2qxp 05.1.26 18:15 Page 40 I Electromagnetic noise enters into TV sets or radios No Is the unit earthed? Earth the unit. Yes Is the distance between the antennas and the indoor unit within 3m, or is the distance between the antennas and the outdoor unit within 3m? Yes Extend the distance between the antennas and the indoor unit, or the antennas and the outdoor unit.
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OB389 --2qxp 05.1.26 18:15 Page 41 10-7. Test point diagram and voltage 1. Outdoor electronic control P.C.
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OB389 --2qxp 05.1.26 18:15 Page 42 2. Noise filter P.C. board MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 CN901 To electronic CN902 CN903 control To power To power P.C. board board board { { 230V AC 50Hz Input { { CN912 R.V.
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OB389 --2qxp 05.1.26 18:15 Page 43 3. Outdoor power board MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Output (Red) (+) 1 (–) 3 (White) Connect to the earth ) Signal reception (From electronic control P.C. board) 5V DC pulse wave CN3 CN5 Fin temperature thermistor RT64 Primary current detection (Connect to the noise filter) CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C.
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OB389 --2qxp 05.1.26 18:15 Page 44 11 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.
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OB389 --2qxp 05.1.26 18:15 Page 45 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board and power board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel.(Refer to 1.) (3) Disconnect the following connectors; CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge temperature thermistor, defrost thermistor and outdoor heat exchanger temperature thermistor)
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OB389 --2qxp 05.1.26 18:15 Page 46 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor, discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor Photo 5 Discharge temperature thermistor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly. (Refer to 2.) (4) Pull out the defrost thermistor from its holder.
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OB389 --2qxp 05.1.26 18:15 Page 47 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and 4-way valve Photo 8 (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) 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 connected with compressor.
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OB389 --2qxp 05.1.26 18:15 Page 48 12 PARTS LIST MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 27 26 31 30 29 28 25 24 1 23 2 22 3 21 4 5 6 20 7 18 17 16 8 14 15 19 10 11 9 12 13 These figures show about MUZ-A26YV.
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OB389 --2qxp 05.1.26 18:15 Page 49 MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Part No.
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OB389 --2qxp 05.1.26 18:15 Page 50 MUZ-GA50VA - E1 MUZ-GA60VA - E1 MUZ-GA71VA - E1 12-2. ACCESSORY No. 1 2 Part No.
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OB389 --2qxp 05.1.
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OB389 --2qxp 05.1.26 18:15 Page 52 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2005. No. OB389 6 Made in Japan New publication, effective Jan. 2005 Specifications subject to change without notice.