Service manual

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SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················6

3. SPECIFICATION·················································6

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

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

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

7. REFRIGERANT SYSTEM DIAGRAM··············12

8. PERFORMANCE CURVES······························15

9. ACTUATOR CONTROL····································26

10. SERVICE FUNCTIONS·····································27

11. TROUBLESHOOTING······································27

12. DISASSEMBLY INSTRUCTIONS·····················46

13. PARTS LIST······················································50

14. RoHS PARTS LIST···········································54

Wireless type

Models

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA -

HFC

utilized

R410A

NOTE:

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

For servicing of RoHS compliant products, refer to the RoHS Parts List.

• Contents of SERVICE FUNCTIONS(10) have been removed.

No. OB389

REVISED EDITION-F

Indoor unit service manual

MSZ-GA•VA Series (OB388)

Please void OB389 REVISED EDITION-E.

OUTDOOR UNIT

Revision F:

• MUZ-GA60VA- has been added.

OB389F--1qxp 07.9.3 5:06 PM Page 1

Summary of content (56 pages)

PAGE 1
OB389F--1qxp 07.9.3 5:06 PM Page 1 Revision F: • MUZ-GA60VA- E3 has been added. SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Please void OB389 REVISED EDITION-E. OUTDOOR UNIT No. OB389 HFC REVISED EDITION-F utilized SERVICE MANUAL R410A Wireless type Models MUZ-GA50VA MUZ-GA60VA MUZ-GA60VA MUZ-GA60VA MUZ-GA71VA MUZ-GA71VA - E1 E1 E2 E3 E1 E2 Indoor unit service manual MSZ-GA•VA Series (OB388) CONTENTS 1. TECHNICAL CHANGES ····································3 2.
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OB389F--1qxp 07.9.3 5:06 PM Page 2 Revision A : • RoHS PARTS LIST has been added. • Failure mode recall function(11-2.) has been changed. • Check of HPS(11-6.H) has been corrected. Revision B: • Compressor has been changed. (MUZ-GA50/60VA) Previous New Model SNB130FLDH SNB130FLDH1 PARTS LIST number E02 851 900 E02 939 900 RoHS PARTS LIST number E12 851 900 E12 939 900 Revision C: • MUZ-GA60/71VA- E2 have been added. • Check of outdoor thermistors(11-6.F) has been corrected.
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OB389F--1qxp 07.9.3 5:06 PM 1 Page 3 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 has been changed. 5.Shape of relay panel has been changed. 6.Signal of terminal block has been changed. MUZ-GA60VA - E1 ➔ MUZ-GA60VA - E2 1.
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OB389F--1qxp 07.9.3 5:06 PM Page 4 Compressor New Specification Current Specification The incompatible refrigeration oil easily separates from Since refrigerant and refrigeration oil are compatible, refrigerant and is in the upper layer inside the suction muffler. refrigeration oil goes back to the compressor through the Raising position of the oil back hole enables to back the lower position oil back hole. refrigeration oil of the upper layer to flow back to the compressor.
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OB389F--1qxp 07.9.3 5:06 PM Page 5 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Pipe mm Wall thickness 6.35 0.8 mm 9.52 0.8 mm Heat resisting foam plastic 12.7 0.8 mm Specific gravity 0.045 Thickness 8 mm 15.88 1.0 mm For liquid For gas Insulation material • Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88).
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OB389F--1qxp 2 07.9.3 5:07 PM Page 6 PART NAMES AND FUNCTIONS MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA ACCESSORIES Air inlet (back and side) Piping 1 Drain socket 1 2 Drain cap [33 2 Drain hose Air outlet Drain outlet 3 SPECIFICATION Outdoor model MUZ-GA50VA Function Cooling Heating Single phase 230V,50Hz 5.0(0.9-5.9) 5.9(0.9-7.8) 2.5 — 2,940/1,650 2,940/2,210 20 6.23 7.01 1,410 1,580 98.4 98.0 7.46 5.93 6.71 0.30 3.42 3.62 Capacity Power supply Electrical data Capacity Rated frequency(Min.
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OB389F--1qxp 07.9.3 5:07 PM Page 7 Specifications and rating conditions of main electric parts Model Smoothing capacitor MUZ-GA60VA MUZ-GA50VA Item (CB1,2,3) 560+ 450V Current transformer (CT1,2) ETQ19Z68AY Current transformer (CT61) ETQ19Z53AY Fuse (F64) 250V 2A Fuse (F801) 250V 3.
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OB389F--1qxp 5 07.9.
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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 NAME SMOOTHING CAPACITOR CURRENT TRANSFORMER CURRENT TRANSFORMER FUSE (T2AL 250V) FUSE (T3.
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OB389F--1qxp 07.9.
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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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OB389F--1qxp 7 07.9.3 5:07 PM Page 12 REFRIGERANT SYSTEM DIAGRAM MUZ-GA50VA MUZ-GA60VA - E1 Unit:mm Refrigerant pipe [12.7 (MUZ-GA50VA) Muffler (with heat insulator) [15.
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OB389F--1qxp 07.9.3 5:07 PM Page 13 MUZ-GA60VA - E3 Unit:mm Refrigerant pipe [15.88 (with heat insulator) Muffler 4-way valve #100 Stop valve (with service port) Flared connection High-pressure switch Discharge temperature thermistor RT62 Outdoor heat exchanger Defrost thermistor RT61 Ambient temperature thermistor RT65 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection LEV Strainer Receiver #100 Stop valve Strainer #100 Capillary tube [3.6✕[2.
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OB389F--1qxp 07.9.3 5:07 PM Page 14 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping : m Max. Height Max. length difference A B Model Piping size O.D : mm Liquid Gas MUZ-GA50VA 12.7 6.35 MUZ-GA60VA 30 15 15.88 MUZ-GA71VA 9.52 Indoor unit Max. Height difference B Refrigerant Piping Max.
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OB389F--1qxp 07.9.3 5:07 PM 8 Page 15 PERFORMANCE CURVES MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 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.
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Page 16 24.1 23.4 27.9 22.3 21.6 25.7 19.8 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 MUZ-GA71VA at Rated frequency 20.4 MSZ-GA60VA MUZ-GA60VA at Rated frequency Indoor air Dry-bulb temperature difference (degree) 07.9.
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OB389F--1qxp 07.9.3 5:07 PM Page 17 8-3. TEST RUN OPERATION (How to operate fixed-frequency operation) 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 operates at rated frequency in COOL mode or 58Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor varies).
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OB389F--1qxp 07.9.3 5:07 PM Page 18 HEAT operation 1 Condition : Indoor Outdoor Dry bulb temperature (°C) 20.0 2 7 15 20.0 Wet bulb temperature (°C) 14.5 1 6 12 14.5 2 Operation : TEST RUN OPERATION (refer to 8-3.) MUZ-GA50VA 10.0 Outdoor unit current (A) 9.0 8.0 7.0 6.0 5.0 4.0 2 5 10 15 20 25(:) Ambient temperature(˚C) MUZ-GA60VA MUZ-GA71VA 16.0 12.0 15.0 Outdoor unit current (A) Outdoor unit current (A) 11.0 14.0 10.0 13.0 12.0 11.0 10.
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OB389F--1qxp 07.9.3 5:07 PM Page 19 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GA50VA : MUZ-GA50VA CAPACITY:5.0(kW) INPUT:1460(W) 21 Q SHC SHF INPUT 18 5.88 2.76 0.47 1200 20 6.13 2.14 0.35 1260 18 5.88 3.00 0.51 1200 20 6.13 2.39 0.39 1260 22 6.38 1.72 0.27 1305 18 5.88 3.23 0.55 1200 20 6.13 2.63 0.43 1260 22 6.38 1.98 0.31 1305 18 5.88 3.47 0.59 1200 20 6.13 2.88 0.47 1260 22 6.38 2.23 0.35 1305 24 6.70 1.54 0.23 1365 18 5.88 3.70 0.63 1200 20 6.13 3.12 0.51 1260 22 6.38 2.49 0.
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OB389F--1qxp 07.9.3 5:07 PM Page 20 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GA50VA : MUZ-GA50VA CAPACITY:5.0(kW) INPUT:1460(W) 35 Q SHC SHF INPUT 18 4.90 2.30 0.47 1470 5.15 1.80 0.35 1530 20 4.90 2.50 0.51 1470 18 20 5.15 2.01 0.39 1530 5.45 1.47 0.27 1590 22 4.90 2.70 0.55 1470 18 20 5.15 2.21 0.43 1530 22 5.45 1.69 0.31 1590 18 4.90 2.89 0.59 1470 20 5.15 2.42 0.47 1530 22 5.45 1.91 0.35 1590 24 5.75 1.32 0.23 1650 18 4.90 3.09 0.63 1470 20 5.15 2.63 0.51 1530 22 5.45 2.13 0.
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OB389F--1qxp 07.9.3 5:07 PM Page 21 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GA60VA : MUZ-GA60VA CAPACITY:6.0(kW) SHF:0.64 INPUT:1930(W) 21 Q SHC SHF INPUT 21 18 7.05 3.24 0.46 1560 7.35 2.50 0.34 1638 21 20 7.05 3.53 0.50 1560 22 18 7.35 2.79 0.38 1638 22 20 7.65 1.99 0.26 1697 22 22 7.05 3.81 0.54 1560 23 18 7.35 3.09 0.42 1638 23 20 7.65 2.30 0.30 1697 23 22 24 18 7.05 4.09 0.58 1560 24 20 7.35 3.38 0.46 1638 24 22 7.65 2.60 0.34 1697 24 24 8.04 1.77 0.22 1775 25 18 7.05 4.37 0.
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OB389F--1qxp 07.9.3 5:07 PM Page 22 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GA60VA : MUZ-GA60VA CAPACITY:6.0(kW) SHF:0.64 INPUT:1930(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 21 18 5.88 2.70 0.46 1911 5.40 2.48 0.46 2028 5.19 2.39 0.46 2067 4.98 2.29 0.46 2106 21 20 6.18 2.10 0.34 1989 5.76 1.96 0.34 2087 5.55 1.89 0.34 2145 5.34 1.82 0.34 2204 5.88 2.94 0.50 1911 5.40 2.70 0.50 2028 5.19 2.60 0.50 2067 4.
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OB389F--1qxp 07.9.3 5:07 PM Page 23 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GA71VA : MUZ-GA71VA CAPACITY:7.1(kW) INPUT:2420(W) 21 Q SHC SHF INPUT 18 8.34 3.75 0.45 1952 8.70 2.87 0.33 2050 20 18 8.34 4.09 0.49 1952 8.70 3.22 0.37 2050 20 9.05 2.26 0.25 2123 22 8.34 4.42 0.53 1952 18 20 8.70 3.57 0.41 2050 22 9.05 2.63 0.29 2123 18 8.34 4.76 0.57 1952 20 8.70 3.91 0.45 2050 22 9.05 2.99 0.33 2123 24 9.51 2.00 0.21 2220 18 8.34 5.09 0.61 1952 20 8.70 4.26 0.49 2050 22 9.05 3.35 0.
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OB389F--1qxp 07.9.3 5:07 PM Page 24 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GA71VA : MUZ-GA71VA CAPACITY:7.1(kW) SHF:0.63 INPUT:2420(W) OUTDOOR DB(:) 35 40 43 46 INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 21 18 6.96 3.13 0.45 2391 6.39 2.88 0.45 2538 6.14 2.76 0.45 2586 5.89 2.65 0.45 2635 7.31 2.41 0.33 2489 6.82 2.25 0.33 2611 6.57 2.17 0.33 2684 6.32 2.09 0.33 2757 21 20 22 18 6.96 3.41 0.49 2391 6.39 3.13 0.49 2538 6.14 3.01 0.
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OB389F--1qxp 07.9.3 5:07 PM Page 25 PERFORMANCE DATA HEAT operation at Rated frequency MSZ-GA50VA : MUZ-GA50VA CAPACITY:5.9(kW) INDOOR DB(:) 15 21 26 INPUT:1630(W) OUTDOOR WB(:) -10 -5 0 5 10 15 20 Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 3.72 1099 4.48 1318 5.25 1487 6.02 1606 6.79 1707 7.49 1758 8.26 1791 3.54 1183 4.25 1403 5.02 1555 5.72 1673 6.49 1758 7.20 1808 7.94 1876 3.19 1268 3.95 1487 4.66 1639 5.43 1758 6.20 1842 6.90 1893 7.67 1944 MSZ-GA60VA : MUZ-GA60VA CAPACITY:6.
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OB389F--1qxp 9 07.9.3 5:07 PM Page 26 ACTUATOR CONTROL MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 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 . . . . . . . . . NOTE: The 4-way . . . . . .
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OB389F--1qxp 07.9.3 5:07 PM 10 Page 27 SERVICE FUNCTIONS Contents of “SERVICE FUNCTIONS” have been removed. 11 TROUBLESHOOTING MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 11-1. 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.
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OB389F--1qxp 07.9.3 5:07 PM Page 28 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 (11-4.) 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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OB389F--1qxp 07.9.3 5:07 PM Page 29 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:.
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OB389F--1qxp 07.9.3 5:07 PM Page 30 3. Outdoor failure mode table The left lamp of OPERATION INDICAOR lamp(Indoor unit) Abnormal point (Failure mode / protection) LED indication Correspondence Condition (Outdoor P.C. board) LED 1 LED 2 Lighting Lighting Overcurrent protection stop is • Check the connection continuously performed 3 times within of the compressor 1 minute after the compressor gets connecting wire. started, or when converter protection • Refer to 11-4.
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OB389F--2qxp 07.9.3 5:08 PM The left lamp of OPERATION INDICATOR lamp(Indoor unit) 11-time flash Page 31 Abnormal point (Failure mode / protection) LED indication (Outdoor P.C. board) LED 1 LED 2 Condition Communication error between P.C. boards Lighting 6 times Communication error occurs between the electronic control P.C. board and power board for more than 10 seconds. The communication between boards protection stop is continuously performed twice.
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OB389F--2qxp 07.9.3 5:08 PM Page 32 11-3. INSTRUCTION OF TROUBLESHOOTING If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function. Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates only in Test Run operation. (Refer to 8-3.) Indoor unit operates. Outdoor unit doesn't operate normally. Outdoor unit doesn't operate even in Test Run operation. (Refer to 8-3.) Check room temperature thermistor.
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OB389F--2qxp 07.9.3 5:08 PM Page 33 11-4. TROUBLESHOOTING CHECK TABLE No. Symptom Indication LED1(Red) LED2(Yellow) Condition Abnormal point / Condition Outdoor unit does not operate. Correspondence • Check the connection of the compressor connecting wire. • Refer to 11-6.E "How to check inverter/compressor". • Check the stop valve.
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OB389F--2qxp 07.9.3 5:08 PM No. Symptom Indication LED1(Red) LED2(Yellow) Outdoor unit 20 operates. Once Twice Lighting Lighting 21 Page 34 Condition Abnormal point / Condition Primary current protection The input current exceeds 15A. Secondary current protection The current of the compressor exceeds 15A. High-pressure protection The indoor gas pipe temperature exceeds 45: during heating. Defrosting in cooling The indoor gas pipe temperature falls 3: or below during cooling.
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OB389F--2qxp 07.9.3 5:08 PM Page 35 11-5. TROUBLE CRITERION OF MAIN PARTS MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Ambient temperature thermistor (RT65) Refer to 11-7. “Test point diagram and voltage”,1. “Outdoor electronic control P.C. board”, the chart of thermistor. Outdoor heat exchanger temperature thermistor (RT68) Discharge temperature thermistor (RT62) Measure the resistance with a tester.
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OB389F--2qxp 07.9.3 5:08 PM Page 36 11-6. TROUBLESHOOTING FLOW Outdoor unit does not operate. A Check of power supply 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. No Replace the reactor.
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OB389F--2qxp 07.9.3 5:08 PM Page 37 • 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 every 0.5-second. Outdoor unit doesn’t 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 in the power supply? No Check the power supply. Yes Turn ON the power supply.
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OB389F--2qxp 07.9.3 5:08 PM Page 38 The cooling operation or heating operation does not operate. C Check of R.V. coil • When heating operation does not work. 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. Disconnect the connector CN912 in noise filter P. C. board.
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OB389F--2qxp 07.9.3 5:08 PM Page 39 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit gets warm. D Check of LEV 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 hands? Normal No Yes Disconnect the connector CN795. Is there normal resistance to LEV coil? Replace the outdoor electronic control P.C. board.
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OB389F--2qxp 07.9.3 5:08 PM Page 40 • When OPERATION INDICATOR lamp flashes 6-time. • When thermistor is abnormal. F Check of outdoor thermistors Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board No (see below table), and measure the resistance of thermistor. Is the thermistor normal? (Refer to 11-7.1.) Yes Reconnect the connector CN661, CN663 and CN3. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION.
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OB389F--2qxp 07.9.3 5:08 PM Page 41 • When the operation frequency does not go up from lowest frequency. H Check of HPS MUZ-GA60VAMUZ-GA71VA E3 1. Disconnect the connector CN681 in the electronic control P.C. board. 2. Check the resistance of HPS 1 minute after the outdoor unit power supply was turned OFF. Check the resistance between each terminal. Infinity Replace HPS. 0" Reconnect CN681. Turn ON power supply to the indoor and outdoor unit. 3 minutes later, start EMERGENCY OPERATION.
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OB389F--2qxp 07.9.3 5:08 PM Page 42 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, and/or the antennas and the outdoor unit.
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07.9.3 5:08 PM Page 43 11-7. TEST POINT DIAGRAM AND VOLTAGE 1. Outdoor electronic control P.C.
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OB389F--2qxp 07.9.3 5:08 PM Page 44 2. Noise filter P.C. board MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA CN901 To electronic CN902 CN903 control To power To power P.C. board board board { { 230V AC Input { { CN912 R.V.
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OB389F--2qxp 07.9.3 5:08 PM Page 45 3. Outdoor power board MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Output (Red) (+) 1 Connect to the earth CN2 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) 5V DC pulse wave (+)2-5(–): Zero cross signal 3-4 : Not used (+)6-5(–): 15V (+)7-5(–): 15V (–) 3 (White) CN3 Fin temperature thermistor RT64 reception (From ) Signal electronic control P.C.
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OB389F--2qxp 12 07.9.3 5:09 PM Page 46 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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OB389F--2qxp 07.9.3 5:09 PM Page 47 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;
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OB389F--2qxp 07.9.3 5:09 PM Page 48 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor, discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (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;
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OB389F--2qxp 07.9.3 5:09 PM Page 49 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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OB389F--2qxp 13 07.9.3 5:09 PM Page 50 PARTS LIST (non-RoHS compliant) MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 13-1.
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OB389F--2qxp 07.9.3 5:09 PM Page 51 PARTS LIST (non-RoHS compliant) MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 13-1. 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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OB389F--2qxp 07.9.3 5:09 PM Page 52 PARTS LIST (non-RoHS compliant) MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 13-2. ACCESSORY No. 1 2 Part No.
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OB389F--2qxp 07.9.
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OB389F--2qxp 14 07.9.3 5:09 PM Page 54 RoHS PARTS LIST (RoHS compliant) MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 14-1.
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OB389F--2qxp 07.9.3 5:09 PM Page 55 RoHS PARTS LIST (RoHS compliant) MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 14-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS No. RoHS Part numbers that are circled are not shown in the illustration. 1 G G 2 G 3 G 4 G G 5 G 6 G 7 G 8 G 9 G G 10 G G 11 G G G G 12 G G 13 G G 14 G 15 G 16 G G 17 G G 18 G 19 G 20 G G G 21 G G 22 G 23 G 24 G 25 G 26 G 27 G G 28 G 29 G 30 G 31 G 32 G 33 G 34 G G 35 G G Part No.
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OB389F--2qxp 07.9.3 5:09 PM Page 56 RoHS PARTS LIST (RoHS compliant) No. RoHS MUZ-GA50VA MUZ-GA60VA MUZ-GA71VA 14-2. ACCESSORY Part No. 1 Part Name 2 Q'ty/unit Symbol in Wiring MUZ-GA50 MUZ-GA60 MUZ-GA71 VA - E1 VA VA Diagram 1 G E12 817 704 DRAIN SOCKET 2 G E12 444 705 DRAIN CAP 1 2 E1 E2 E3 E1 E2 1 2 1 2 1 2 1 2 1 2 Remarks [33 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.