Service manual

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SERVICE MANUAL

CONTENTS

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

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

3. SPECIFICATION·················································7

4. NOISE CRITERIA CURVES·······························9

5. OUTLINES AND DIMENSIONS ·······················10

6. WIRING DIAGRAM···········································11

7. REFRIGERANT SYSTEM DIAGRAM··············15

8. PERFORMANCE CURVES······························17

9. ACTUATOR CONTROL····································25

10. SERVICE FUNCTIONS·····································26

11. TROUBLESHOOTING······································26

12. DISASSEMBLY INSTRUCTIONS·····················45

13. PARTS LIST······················································48

Wireless type

Models

No. OB379

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUZ-GA25VA -

MUZ-GA35VA -

MUZ-GA25VAH -

MUZ-GA35VAH -

MUZ-GA25VA -

MUZ-GA35VA -

MUZ-GA25VAH -

MUZ-GA35VAH -

Indication of

model name

NOTE:

This service manual describes technical data of the outdoor units.

•As for indoor units MSZ-GA22VA- , MSZ-GA25VA- and MSZ-GA35VA- , refer to the

service manual OB378.

E1E1E1

HFC

utilized

R410A

OB379 --1qxp 05.1.17 16:39 Page 1

Summary of content (52 pages)

PAGE 1
OB379 --1qxp 05.1.17 16:39 Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS HFC No. OB379 utilized SERVICE MANUAL R410A Wireless type Models MUZ-GA25VA MUZ-GA35VA MUZ-GA25VAH MUZ-GA35VAH E1 E1 E1 E1 CONTENTS Indication of model name MUZ-GA25VA - E1 MUZ-GA35VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VAH - E1 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················6 3. SPECIFICATION·················································7 4.
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OB379 --1qxp 05.1.17 16:39 Page 2 1 TECHNICAL CHANGES MUZ-A09YV - E1 MUZ-A09YVH - E1 ➔ MUZ-GA25VA - E1 ➔ MUZ-GA25VAH - E1 1.Indication of capacity has been changed.(BTU base ➔ kW base) 2.Control method between indoor and outdoor unit has been changed. 3.Power supply method has been changed (change to supply from outdoor unit). 4.Terminal block for power supply has been added. 5.Power P.C. board has been changed. 6.Inverter P.C. board has been changed. 7.Refrigerant circuit has been changed.
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OB379 --1qxp 05.1.17 16:39 Page 3 INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air conditioners. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/ materials are required. Refer to the table below.
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OB379 --1qxp 05.1.17 16:39 Page 4 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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OB379 --1qxp 05.1.17 16:39 Page 5 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 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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OB379 --1qxp 05.1.
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OB379 --1qxp 05.1.17 16:39 Page 7 3 SPECIFICATION MUZ-GA25VA - E1 MUZ-GA25VAH - E1 Outdoor model Cooling Function Electrical Capacity data Power supply Special remarks Fan motor Compressor kW Capacity Rated frequency(Min.-Max.) r/h Dehumidification K /h Air flow ✽1 A Starting current ✽1 A Compressor motor current ✽1 A Fan motor current ✽1 Coefficient of performance(C.O.
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OB379 --1qxp 05.1.17 16:39 Page 8 Specifications and rating conditions of main electric parts OUTDOOR UNIT Model Item MUZ-GA25VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VA - (CT) ETA19Z59BZ Current transformer (CT761, CT781) ETQ19Z71AY Smoothing capacitor (C63A, C63B, C63C) 620+ 420V Current transformer (DB61, DB65) D25XB60 Fuse (F61) 250V 20A Fuse (F71, F801) Diode module (H) Defrost heater Intelligent power module (IPM) Expansion valve coil (LEV) MUZ-GA35VAH - 250V 3.
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OB379 --1qxp 05.1.
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OB379 --1qxp 05.1.17 16:39 Page 10 5 OUTLINES AND DIMENSIONS MUZ-GA25VA - E1 MUZ-GA35VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VAH - E1 Unit: mm OUTDOOR UNIT REQUIRED SPACE Drain hole [42 (MUZ-GA25/GA35VA) Drain hole [33 (MUZ-GA25/GA35VAH) 100 mm or m Bolt pitch for installation 304~325 ore 44 Air in 40 2 holes 10X21 ore rm mo m 200 Open two sides of left, right, or rear side. 17.5 Service panel Air out 23 22.3 Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 Handle 3569 302.
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TO INDDOR UNIT CONNECTING RED 12-24V S3 11 BLU REACTOR 4 CN726 2 1 RT61 2 1 21R1 CN725 DB65 CN601 LDY TR821 R831 NAME 1 2 3 4 5 + + IC801 R61 T801 F801 T801 TR821 SOLID STATE RELAY SWITCHING POWER TRANSISTOR TRANSFORMER FIN TEMPERATURE THERMISTOR 21S4 AMBIENT TEMPERATURE THERMISTOR 21R1 INTELLIGENT POWER DEVICE RT64 INTELLIGENT POWER MODULE RT65 IC801 IPM SOLENOID VALVE COIL R.V. COIL CT761 1 2 3 4 1 2 CN641 CN642 LD-W CN61 MC WHT REDW BLK V U NOTE:1.
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TO INDDOR UNIT CONNECTING RED 12-24V S3 12 1 2 1 2 RED RED 1 2 3 WHITE SYMBOL BLU X66 REACTOR RT61 FUSE (T20AL250V) 2 1 INTELLIGENT POWER MODULE R61,R831 CURRENT-DETECTING RESISTOR LDY NAME 1 2 3 4 5 CN601 R831 TR821 + IC801 R61 T801 F801 SOLID STATE RELAY TRANSFORMER HEATER PROTECTOR SOLENOID VALVE COIL R.V. COIL CT761 LD-W RT65 1 2 1 2 CN61 MC WHT RED W BLK V U NOTE:1.
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TO INDDOR UNIT CONNECTING 13 REACTOR F61 C N 7 2 6 C N 7 2 7 1 2 3 4 5 CN601 DB65 DB61 TR821 + NAME MF 1 2 3 4 5 1 2 3 4 5 1 2 3 DISCHARGE TEMPERATURE THERMISTOR 21S4 FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR INTELLIGENT POWER MODULE RT64 EXPANSION VALVE COIL LEV R.V. COIL X63,X64 RELAY TRANSFORMER SWITCHING POWER TRANSISTOR TB1,TB2 TERMINAL BLOCK T801 CT761 LD-W LEV CN61 MC WHT REDW BLK V U NOTE:1.
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TO INDDOR UNIT CONNECTING 14 RED BLU WHITE X66 AMBIENT TEMPERATURE THERMISTOR INTELLIGENT POWER MODULE RT65 EXPANSION VALVE COIL IPM LEV R61,R831 CURRENT-DETECTING RESISTOR FIN TEMPERATURE THERMISTOR INTELLIGENT POWER DEVICE RT64 BLK C N 7 2 5 TB800 LD69 LD70 1 2 3 4 5 CN601 DB65 DB61 TR821 + NAME MF 1 2 3 4 5 1 2 3 4 5 1 2 3 TRANSFORMER 21S4 HEATER PROTECTOR R.V. COIL X63,X64,X66 RELAY T801 LD-W LEV CN61 MC WHT REDW BLK V U NOTE:1.
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OB379 --1qxp 05.1.17 16:39 Page 15 7 REFRIGERANT SYSTEM DIAGRAM MUZ-GA25VA - E1 MUZ-GA25VAH - E1 OUTDOOR UNIT Unit:mm 4-way valve Refrigerant pipe [9.52 (with heat insulator) Muffler Stop valve (with service port) Discharge temperatuer thermistor RT62 Flared connection Outdoor heat exchanger Muffler Ambient temperature thermistor RT65 Compressor Defrost thermistor RT61 Capillary tube [3.0✕[1.4✕500 Flared connection Strainer #100 Solenoid valve R.V.
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OB379 --1qxp 05.1.17 16:39 Page 16 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Model Piping size O.D : mm Max. length : m MUZ-GA25VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VA - E1 MUZ-GA35VAH - E1 A Gas Liquid 20 9.52 6.35 Length of connecting pipe : m Indoor unit Outdoor unit Gas 0.43 Liquid 0.5 MAX. HEIGHT DIFFERENCE Indoor unit w Max. Height difference 12m Refrigerant Piping Max.
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OB379 --1qxp 05.1.17 16:39 Page 17 8 PERFORMANCE CURVES MUZ-GA25VA - E1 MUZ-GA35VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VAH - 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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24.7 18.2 22.8 20.9 15.2 19.0 13.7 17.1 12.1 15.2 10.6 13.3 9.1 11.4 r oo te take r in doo MUZ-GA25VA - E1 MUZ-GA25VAH - E1 Outdoor intake air Wet-bulb temperature (:) MUZ-GA25VA - E1 MUZ-GA25VAH - E1 Correction of Cooling total input MUZ-GA25VA - E1 MUZ-GA25VAH - E1 Correction of Heating total input 2.0 Correction of Heating capacity 2.0 Capacity correction factors Input correction factors 1.0 0.5 0.
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OB379 --1qxp 05.1.17 16:39 Page 19 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Dry-bulb temperature Relative humidity(%) 20 50 25 60 30 70 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Air flow : High speed 3 Operational frequency : 65Hz(MUZ-GA25VA, MUZ-GA25VAH) 88Hz(MUZ-GA35VA, MUZ-GA35VAH) MUZ-GA35VA - E1 MUZ-GA35VAH - E1 MUZ-GA25VA - E1 MUZ-GA25VAH - E1 12 (kgf/F [Gauge]) (MPa [Gauge]) 14 1.
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OB379 --1qxp 05.1.17 16:39 Page 20 PERFORMANCE DATA COOL operation Rated frequency 65Hz MSZ-GA25VA - E1 : MUZ-GA25VA - E1 MUZ-GA25VAH - E1 CAPACITY:2.5(kW) INPUT:640(W) 21 Q SHC SHF INPUT 18 2.94 1.79 0.61 512 20 3.06 1.50 0.49 538 18 2.94 1.91 0.65 512 20 3.06 1.62 0.53 538 22 3.19 1.31 0.41 557 18 2.94 2.03 0.69 512 20 3.06 1.75 0.57 538 22 3.19 1.43 0.45 557 18 2.94 2.14 0.73 512 20 3.06 1.87 0.61 538 22 3.19 1.56 0.49 557 24 3.35 1.24 0.37 582 18 2.94 2.26 0.77 512 20 3.06 1.99 0.65 538 22 3.19 1.
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OB379 --1qxp 05.1.17 16:39 Page 21 PERFORMANCE DATA COOL operation Rated frequency 65Hz MSZ-GA25VA - E1 : MUZ-GA25VA - E1 MUZ-GA25VAH - E1 CAPACITY:2.5(kW) SHF:0.79 INPUT:640(W) OUTDOOR DB(:) 35 40 INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q 21 18 2.45 1.49 0.61 627 2.25 1.37 0.61 666 2.08 21 20 2.58 1.26 0.49 653 2.40 1.18 0.49 685 2.23 22 18 2.45 1.59 0.65 627 2.25 1.46 0.65 666 2.08 22 20 2.58 1.36 0.53 653 2.40 1.27 0.53 685 2.23 22 22 2.73 1.12 0.41 678 2.55 1.05 0.41 717 2.
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OB379 --1qxp 05.1.17 16:39 Page 22 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-GA35VA - E1 : MUZ-GA35VA - E1 MUZ-GA35VAH - E1 CAPACITY:3.5(kW) INPUT:1080(W) 21 Q SHC SHF INPUT 18 4.11 2.39 0.58 864 20 4.29 1.97 0.46 907 18 4.11 2.55 0.62 864 20 4.29 2.14 0.50 907 22 4.46 1.70 0.38 940 18 4.11 2.71 0.66 864 20 4.29 2.32 0.54 907 22 4.46 1.87 0.42 940 18 4.11 2.88 0.70 864 20 4.29 2.49 0.58 907 22 4.46 2.05 0.46 940 24 4.69 1.59 0.34 983 18 4.11 3.04 0.74 864 20 4.29 2.66 0.62 907 22 4.46 2.
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OB379 --1qxp 05.1.17 16:39 Page 23 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-GA35VA - E1 : MUZ-GA35VA - E1 MUZ-GA35VAH - E1 CAPACITY:3.5(kW) INPUT:1080(W) 35 Q SHC SHF INPUT 18 3.43 1.99 0.58 1058 20 3.61 1.66 0.46 1102 18 3.43 2.13 0.62 1058 20 3.61 1.80 0.50 1102 22 3.82 1.45 0.38 1145 18 3.43 2.26 0.66 1058 20 3.61 1.95 0.54 1102 22 3.82 1.60 0.42 1145 18 3.43 2.40 0.70 1058 20 3.61 2.09 0.58 1102 22 3.82 1.75 0.46 1145 24 4.03 1.37 0.34 1188 18 3.43 2.54 0.74 1058 20 3.61 2.24 0.
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OB379 --1qxp 05.1.17 16:39 Page 24 PERFORMANCE DATA HEAT operation MSZ-GA25VA - E1 : MUZ-GA25VA - E1 MUZ-GA25VAH - E1 CAPACITY:3.2(kW) INDOOR DB(:) 15 21 26 Rated frequency 85Hz INPUT:760(W) OUTDOOR WB(:) -10 -5 0 5 10 15 20 Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 2.02 494 2.43 593 2.85 669 3.26 722 3.68 768 4.06 790 4.48 806 1.92 532 2.30 631 2.72 699 3.10 752 3.52 790 3.90 813 4.30 844 1.73 570 2.14 669 2.53 737 2.94 790 3.36 828 3.74 851 4.
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OB379 --1qxp 05.1.17 16:39 Page 25 9 ACTUATOR CONTROL MUZ-GA25VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VA - E1 MUZ-GA35VAH - 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 motor OFF 9-2. R.V. coil control Heating . . . . . Cooling. . . . . . Dry . . . . .
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OB379 --1qxp 05.1.17 16:39 Page 26 10 SERVICE FUNCTIONS MUZ-GA25VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VA - E1 MUZ-GA35VAH - E1 CHANGE IN DEFROST SETTING When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-7-1.
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OB379 --1qxp 05.1.17 16:39 Page 27 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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OB379 --1qxp 05.1.17 16:39 Page 28 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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Compressor synchronous abnormality ( Compressor start-up failure protection) Discharge temperature thermistor overheat protection Overcurrent protection Ambient temperature thermistor P.C. board temperature thermistor Discharge temperature thermistor Defrost thermistor Fin temperature thermistor Outdoor power system Details of abnormal point 29 Outdoor fan protection Outdoor fan protection 8-time flash 2.
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OB379 --1qxp 05.1.17 16:39 Page 30 11-3. 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. Outdoor unit doesn't operate even in Test Run operation. w Indoor unit doesn't receive the signal from remote controller. Indoor unit operates, when EMERGENCY OPERATION switch is pressed. Unit doesn't operate normal operation in COOL or HEAT mode.
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OB379 --2qxp 05.1.17 16:38 Page 31 Inverter P.C. board (Parts side) 11-4. Troubleshooting check table NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1. 2. LED lights up during normal operation. No. Symptom 1 Outdoor unit does not operate LED indication Abnormal point/ Condition 1-time flash every Outdoor power 2.5 seconds system NOTE: For abnormality location, refer to 'Indoor troubleshooting check table'. Refer to service manual OB371.
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OB379 --2qxp 05.1.17 16:38 Page 32 11-5. Trouble criterion of main parts MUZ-GA35VA - E1 MUZ-GA35VAH - E1 Part name Discharge temperature thermistor(RT62) Fin temperature thermistor(RT64) Measure the resistance with a tester. (Part temperature –10˚C ~ 40˚C) Normal 5 k" ~ 55 k" Abnormal Open or short-circuit Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.
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OB379 --2qxp 05.1.17 16:38 Page 33 11-6. Troubleshooting flow When OPERATION INDICATOR lamp flashes 5-time. Outdoor unit does not operate. A How to check inverter/ compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage between terminals. Are the voltages balanced? See 11-6.B “Check of open phase” . No Check the resistance of the intelligent power module. See 11-6.C 'Check of intelligent power module'. Yes Check the compressor.
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OB379 --2qxp 05.1.17 16:38 Page 34 D Check of compressor Start 11-6.E "Check of compressor winding". Is the compressor normal? No Replace the compressor. Yes 11-6.F "Check of compressor operation time". Does the compressor operate continuously? No Is the compressor operation time more than 10 seconds? Yes Ok No Replace the compressor. Yes Check the refrigerant circuit.
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OB379 --2qxp 05.1.17 16:38 Page 35 When OPERATION INDICATOR lamp flashes 6-time. The thermistors in the outdoor unit are abnormal. G Check of outdoor thermistors Defrost thermistor RT61 Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board. (Check the characteristics of each thermistor.) Measure the resistance between CN641 1 and 2. 1 Reconnect the connectors CN641, CN642 and CN643. 2 Disconnect the connector (CN61) between the compressor and intelligent power module.
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OB379 --2qxp 05.1.17 16:38 Page 36 Outdoor fan motor does not operate. I Check of outdoor fan motor MUZ-GA25VA - E1 MUZ-GA25VAH - E1 Check the resistance of fan motor. (Refer to 11-5.) Is the resistance of fan motor normal? No Replace the outdoor fan motor. Yes Disconnect the connector CN771 on the power P.C. board. Disconnect the connector (CN61) between compressor and power transistor module. Turn ON the power supply and press the EMERGENCY OPERATION switch. Rectify indoor/ outdoor connecting wire.
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OB379 --2qxp 05.1.17 16:38 Page 37 Outdoor fan motor does not operate. I Check of outdoor fan motor MUZ-GA35VA - E1 MUZ-GA35VAH - E1 Is the resistance between each terminal of outdoor fan motor Yes Disconnect CN932 from the inverter P.C. board. Rotate the outdoor fan slowly by hand, and measure the voltage of CN931 (Measurement of feedback output). Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) Turn ON the power supply. No Inverter P.C.
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OB379 --2qxp 05.1.17 16:38 Page 38 Outdoor unit does not operate at all, or stops immediately due to overcurrent. K Check of current-limiting resistor When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly. Does the current-limiting resistor (R64A or R64B) on the power P.C. board short out? (Normal resistance : 5') No Turn ON the power supply and press EMERGENCY OPERATION switch of the indoor unit. Does LED on the inverter P.C.
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OB379 --2qxp 05.1.17 16:38 Page 39 Outdoor base gets frozen. M Check of defrost heater Check the following points before checking electric continuity. 1) Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-7.1. 2) Is the resistance of defrost heater normal? Refer to 11-5.
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OB379 --2qxp 05.1.17 16:38 Page 40 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. O 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. Is there 230V AC between outdoor terminal block S1 and S2? No Check the wiring. Yes Press EMERGENCY OPERATION switch.
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OB379 --2qxp 05.1.17 16:38 Page 41 When the cool air does not blow out from the indoor unit in Low Outside Temperature Operation, or the condensed water drops from the indoor unit. P Operation check of the solenoid valve. Enter the failure mode recall function. Do you hear the operation sound (click sound) of the solenoid valve every 5 seconds? Yes No No Correct the connection. The solenoid valve is normal. Check the ambient temperature thermistor (RT65) in the outdoor unit.
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OB379 --2qxp 05.1.17 16:38 Page 42 Q 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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OB379 --2qxp 05.1.17 16:38 Page 43 11-7. Test point diagram and voltage. MUZ-GA25VA - E1 MUZ-GA35VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VAH - E1 1. Inverter P.C.
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OB379 --2qxp 05.1.17 16:38 Page 44 MUZ-GA25VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VA - E1 MUZ-GA35VAH - E1 2. Power P.C. board Back side of unit MUZ-GA25VA MUZ-GA25VAH Solenoid valve coil (CN923) 230V AC Varistor (NR63) Varistor (NR62) Varistor (NR64) Front side of unit 230V AC MUZ-GA25VA MUZ-GA25VAH Output to drive outdoor Fan motor(CN771) 230V AC R.V.coil(CN721) 230V AC Connecting wire with inverter P.C.board (CN726) Refer to 11-6.M 230V AC Heater connector (CN722) Refer to 11-6.
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OB379 --2qxp 05.1.17 16:38 Page 45 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.
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OB379 --2qxp 05.1.17 16:38 Page 46 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board and power P.C. board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Disconnect the ground wires (See Photo 3.), the lead wire to the reactor and the following connectors;
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OB379 --2qxp 05.1.17 16:38 Page 47 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to 1.) (3) Disconnect the connectors for outdoor fan motor. (4) Remove the propeller nut. (5) Remove the propeller. (6) Remove the screws fixing the fan motor. (See Photo 7.) (7) Remove the fan motor. 6.
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OB379 --2qxp 05.1.17 16:38 Page 48 13 PARTS LIST MUZ-GA25VA - E1 MUZ-GA35VA - E1 E1 MUZ-GA25VAH MUZ-GA35VAH - E1 13-1.
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OB379 --2qxp 05.1.17 16:38 Page 49 MUZ-GA25VA - E1 MUZ-GA35VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VAH - E1 13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. No. Part No.
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OB379 --2qxp 05.1.17 16:38 Page 50 MUZ-GA25VA - E1 MUZ-GA35VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VAH - E1 13-2. OUTDOOR UNIT ELECTRICAL PARTS 9 10 8 7 6 2 1 3 5 4 Part numbers that are circled are not shown in the illustration. No. Part No.
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OB379 --2qxp 05.1.17 16:38 Page 51 MUZ-GA25VA - E1 MUZ-GA35VA - E1 13-3. DRAIN SOCKET Outdoor unit {42 drain hole 1 Soft vinyl chloride hose of 25mm inside diameter. No. Parts No. Parts Name Q'ty/unit Symbol in Wiring MUZ-GA25VA- E1 MUZ-GA35VADiagram 1 E02 838 704 DRAIN SOCKET 1 E1 Remarks 1 MUZ-GA25VA - E1 MUZ-GA35VA - E1 MUZ-GA25VAH - E1 MUZ-GA35VAH - E1 13-4.
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OB379 --2qxp 05.1.17 16:38 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. OB379 6 Made in Japan New publication, effective Jan. 2005 Specifications subject to change without notice.