OB370-1.qxp 04.10.14 1:45 PM Page 1 SPLIT-TYPE, AIR CONDITIONERS HFC No. OB370 utilized SERVICE MANUAL R410A Wireless type Models MU-GA50VB MU-GA60VB MU-GA80VB - E1 E1 E1 CONTENTS Indication of model name MU-GA50VB - E1 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3. SPECIFICATION·················································6 4. NOISE CRITERIA CURVES ·······························8 5.
OB370-1.qxp 1 04.10.14 1:45 PM Page 2 TECHNICAL CHANGES MU-A18WV - E1 ➔MU-GA50VB - E1 1. Oil separator has been removed. 2. Model name has been changed. Indication of capacity has been changed. (BTU➔kW) MU-A24WV - E1 ➔MU-GA60VB - E1 MU-A30WV - E1 ➔MU-GA80VB - E1 1. Model name has been changed. Indication of capacity has been changed. (BTU➔kW) INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT • This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer.
04.10.14 1:45 PM Page 3 New Specification Compressor Current Specification The incompatible refrigerating oil easily separates from Since refrigerant and refrigerating oil are compatible each, refrigerant and is in the upper layer inside the suction muffler. refrigerating oil backs to the compressor through the lower Raising position of the oil back hole enables to back the position oil back hole. refrigerating oil of the upper layer to flow back to the compressor.
OB370-1.qxp 04.10.14 1:45 PM Page 4 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter Pipe For liquid For gas 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 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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OB370-1.qxp 3 04.10.14 1:45 PM Page 6 SPECIFICATION Outdoor model Function Capacity Power supply Special remarks Fan Compressor motor Electrical data Capacity kW Dehumidification r/h Air flow(High) K /h Power outlet A Running current A Power input W Power factor % Starting current A Compressor motor current A Fan motor current A Coefficient of performance(C.O.
04.10.14 1:45 PM Page 7 Outdoor model Function MU-GA80VB - E1 Cooling Single phase 230V, 50Hz 8.5 4.6 2,940/1,470 w 25 14.42 3,191 96 90 13.85 0.57 2.61 NN37VAAHT 2,500 C-R 0.64 C-S 1.63 RA6V75-AD WHT-BLK 62.8 BLK-YLW 55.9 YLW-RED 26.
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04.10.14 1:45 PM 5 Page 9 OUTLINES AND DIMENSIONS MU-GA50VB - E1 MU-GA60VB - E1 OUTDOOR UNIT 35 20 mor e m or 500m 50 Air out e mor m or m 0 0 1 345 Air in 310 290 248 90 100m m or Drainage 3holes [33 100mm or more 355 350 Air in Drainage hole [16.2 Unit: mm 30 more 350 mm or m ore Service panel 20 100 157 35- 292 30- 605 Liquid refrigerant pipe joint Refregerant pipe (flared) [6.35 183 161 500 850 Gas refregerant pipe joint Refregerant pipe (flared) [12.
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04.10.14 1:45 PM Page 11 MU-GA80VB - E1 MODEL WIRING DIAGRAM OUTDOOR UNIT MF 6 5 4 3 2 1 C2 1 2 3 CN711 CN724 SR62 X52 N SR61 TAB52 X52 PE COM GRN/YLW POWER SUPPLY ~ / N 230V 50Hz CIRCUIT BREAKER CN662 RED ORN YLW BLK WHT 6 TB1 L YLW BLK WHT ORN RED LEV DSAR BRN RT62 RT63 TO INDOOR UNIT CONNECTING 12V OB370-1.qxp NO CN730 DEICER P.C.
OB370-1.qxp 7 04.10.14 1:45 PM Page 12 REFRIGERANT SYSTEM DIAGRAM MU-GA50VB - E1 OUTDOOR UNIT Unit:mm Refrigerant pipe [12.7 (with heat insulator) Flared connection Muffler Stop valve (with service port) Strainer #100 Outdoor heat exchanger Compressor Flared connection Stop valve Capillary tube [3.0o[1.6o600 Refrigerant pipe [6.35 (with heat insulator) MU-GA60VB - E1 OUTDOOR UNIT Refrigerant pipe [15.
OB370-1.qxp 04.10.14 1:45 PM Page 13 MU-GA80VB - E1 OUTDOOR UNIT Unit:mm Refrigerant pipe [15.88 (with heat insulator) Muffler Stop valve (with service port) Outdoor heat exchanger Discharge temperature thermistor RT62 Flared connection Muffler Compressor Capillary tube [4.0✕[2.4✕200 (Upper path) Flared connection LEV Ambient temperature thermistor RT63 Capillary tube [4.0✕[2.4✕100 (Lower path) Strainer Stop valve Refrigerant pipe [9.52 (with heat insulator) Capillary tube [3.6✕[2.
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OB370-1.qxp 04.10.14 1:45 PM 8 Page 15 PERFORMANCE CURVES MU-GA50VB - E1 MU-GA60VB - E1 MU-GA80VB - 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.
OB370-1.qxp 04.10.14 1:45 PM Page 16 2 Air flow should be set at MAX. 3 The unit of pressure has been changed to MPa on the international system of units(SI unit system). f [Gauge]) The conversion factor is : 1(MPa [Gauge]) =10.2(kgf/f MU-GA50VB - E1 MU-GA50VB - E1 9 12 1.2 11 1.1 10 1.0 9 0.9 8 0.8 7 0.7 15 Outdoor unit current (A) Outdoor low pressure (kgf/F[Gauge])(MPa[Gauge]) 230V 18 20 50 25 60 30 32 70(%) 230V 8 7 6 5 15 35(:) 10 1.0 9 0.9 8 0.8 7 0.7 6 0.
OB370-1.qxp 04.10.14 1:45 PM Page 17 PERFORMANCE DATA COOL operation MS-GA50VB - E1 : MU-GA50VB - E1 (230V) CAPACITY : 5.0(kW) SHF : 0.65 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 5.88 6.13 5.88 6.13 6.38 5.
OB370-1.qxp 04.10.14 1:45 PM Page 18 PERFORMANCE DATA COOL operation MS-GA50VB - E1 : MU-GA50VB - E1 (230V) CAPACITY : 5.0(kW) SHF : 0.65 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 4.90 5.15 4.90 5.15 5.45 4.
OB370-1.qxp 04.10.14 1:45 PM Page 19 PERFORMANCE DATA COOL operation MS-GA60VB - E1 : MU-GA60VB - E1 (230V) CAPACITY : 6.5(kW) SHF : 0.63 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 7.64 7.96 7.64 7.96 8.29 7.
OB370-1.qxp 04.10.14 1:45 PM Page 20 PERFORMANCE DATA COOL operation MS-GA60VB - E1 : MU-GA60VB - E1 (230V) CAPACITY : 6.5(kW) SHF : 0.63 INDOOR INDOOR DB(:) WB(:) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 NOTE Q 6.37 6.70 6.37 6.70 7.09 6.
OB370-1.qxp 04.10.14 1:45 PM Page 21 PERFORMANCE DATA COOL operation MS-GA80VB - E1 : MU-GA80VB - E1 (230V) CAPACITY : 8.5(kW) SHF : 0.62 INDOOR INDOOR DB(:) WB(:) Q 21 18 9.99 21 20 10.41 22 18 9.99 22 20 10.41 22 22 10.84 23 18 9.99 23 20 10.41 23 22 10.84 24 18 9.99 24 20 10.41 24 22 10.84 24 24 11.39 25 18 9.99 25 20 10.41 25 22 10.84 25 24 11.39 26 18 9.99 26 20 10.41 26 22 10.84 26 24 11.39 26 26 11.73 27 18 9.99 27 20 10.41 27 22 10.84 27 24 11.39 27 26 11.73 28 18 9.99 28 20 10.41 28 22 10.
OB370-1.qxp 04.10.14 1:45 PM Page 22 PERFORMANCE DATA COOL operation MS-GA80VB - E1 : MU-GA80VB - E1 (230V) CAPACITY : 8.5(kW) SHF : 0.62 INDOOR INDOOR DB(:) WB(:) Q 21 18 8.33 21 20 8.76 22 18 8.33 22 20 8.76 22 22 9.27 23 18 8.33 23 20 8.76 23 22 9.27 24 18 8.33 24 20 8.76 24 22 9.27 24 24 9.78 25 18 8.33 25 20 8.76 25 22 9.27 25 24 9.78 26 18 8.33 26 20 8.76 26 22 9.27 26 24 9.78 26 26 10.29 27 18 8.33 27 20 8.76 27 22 9.27 27 24 9.78 27 26 10.29 28 18 8.33 28 20 8.76 28 22 9.27 28 24 9.78 28 26 10.
OB370-1.qxp 04.10.14 1:45 PM 9 Page 23 TROUBLESHOOTING MU-GA50VB - E1 MU-GA60VB - E1 MU-GA80VB - E1 9-1. 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.
OB370-1.qxp 04.10.14 1:45 PM Page 24 9-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. Check room temperature thermistor. Refer to "Test point diagram and voltage". Outdoor unit doesn't operate even in Test Run operation. MU-GA80VB Refer to 9-4. A "Check of outdoor unit". MU-GA80VB Flash on and off at 0.
04.10.14 1:45 PM Page 25 9-3. Trouble criterion of main parts MU-GA50VB - E1 MU-GA60VB - E1 Part name Discharge temperature thermistor(RT62) MU-GA80VB Ambient temperature thermistor(RT63) MU-GA80VB Compressor (MC) INNER PROTECTOR 160i 5: OPEN 90i10: CLOSE MU-GA80VB - E1 Check method and criterion Figure Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up.
OB370-1.qxp 04.10.14 1:45 PM Page 26 9-4. Troubleshoot flow Compressor and/or outdoor fan motor doesn’t operate. A Check of outdoor unit MU-GA80VB Turn ON the power supply. Is there 230V AC to between L-N on the outdoor terminal block? No Check the outdoor power supply and connection of wiring. Yes Compressor does not operate. Is there 5V DC between No J101 + - J401 on the deicer P.C. board? w Yes No Rectify the connecting wire. Replace the deicer P.C. board.
OB370-1.qxp 04.10.14 1:45 PM Page 27 Compressor and/or outdoor fan motor doesn’t stop. B Check of outdoor unit MU-GA80VB 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again.
OB370-1.qxp 04.10.14 1:45 PM Page 28 When OPERATION INDICATOR lamp flashes 10-time. Cooling doesn't operate. D Check of LEV (Expansion valve) MU-GA80VB Turn ON the power supply. 1 During pressing both the OPERATION SELECT button and the TOO COOL button on the remote controller at the same time, press the RESET button. 2 First, release the RESET button. And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds.
04.10.14 1:45 PM Page 29 9-5. Test point diagram and voltage MU-GA80VB - E1 Outdoor deicer P.C. board Ambient temperature thermistor (RT63) 100 Discharge temperature thermistor(RT62) 900 Resistance(k") 800 700 600 Resistance(k") 90 80 70 60 50 40 500 400 30 300 20 200 10 100 0 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature(:) CN662 1-2 Discharge temperature thermistor (RT62) (Refer to page 28.
OB370-1.qxp 10 04.10.14 1:45 PM Page 30 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. (1) Slide the sleeve and check if there is a locking lever or not.
OB370-2.qxp 04.10.14 1:46 PM Page 31 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) (2) Disconnect the connector and remove the hooked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller. (4) Remove screws fixing the outdoor fan motor. (5) Remove the outdoor fan motor. Hook Photo 4 Propeller nut Propeller 4. Removing the compressor (1) (2) (3) (4) (5) Remove the cabinet. (Refer to 1.) Remove the relay panel.
OB370-2.qxp 04.10.14 1:46 PM Page 32 10-2. MU-GA60VB - E1 OUTDOOR UNIT PHOTOS OPERATING PROCEDURE 1. Removing the cabinet (1) Remove the screws of the cabinet. (2) Hold the bottom of the cabinet on the both side to remove the cabinet. Photo 1 Screws Service panel Photo 2 Screws 2. Removing the electrical parts Photo 3 (1) Remove the cabinet . (Refer to 1.) (2) Remove the following parts.
OB370-2.qxp 04.10.14 1:46 PM Page 33 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor Photo 4 (1) Remove the cabinet. (Refer to 1.) (2) Disconnect the connector and remove the hocked lead wire from the fan motor. (3) Remove the propeller nut and remove the propeller. (4) Remove the screws fixing the fan motor. (5) Remove the outdoor fan motor. Propeller 4. Removing the compressor (1) (2) (3) (4) Remove the cabinet. (Refer to 1.) Remove the soundproof felt.
OB370-2.qxp 04.10.14 1:46 PM Page 34 10-3. MU-GA80VB - E1 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1.Removing the cabinet Photo 1 (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the top panel. (6) Remove the valve cover. (7) Remove the screws of the front panel. (8) Remove the front panel. (9) Remove the screws of the back panel. (10) Remove the back panel.
OB370-2.qxp 04.10.14 1:46 PM Page 35 PHOTOS OPERATING PROCEDURE 3. Removing the propeller and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller nut and the propeller. NOTE : Loose the propeller in the rotating direction for removal. When attaching the propeller, align the mark on the propeller and the motor shaft cut section. Set the propeller in position by using the cut on the shaft and the mark on the propeller.
OB370-2.qxp 11 04.10.14 1:47 PM Page 36 PARTS LIST MU-GA50VB - E1 MU-GA60VB - E1 11-1.
OB370-2.qxp 04.10.14 1:47 PM Page 37 MU-GA50VB - E1 MU-GA60VB - E1 11-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that is circled is 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 Part No.
OB370-2.qxp 04.10.14 1:47 PM Page 38 MU-GA80VB - E1 11-2.
OB370-2.qxp 04.10.14 1:47 PM Page 39 MU-GA80VB - E1 11-2. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. No. Part No.
OB370-2.qxp 04.10.14 1:47 PM Page 40 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Oct. 2004. No.OB370 6 Made in Japan New publication, effective Oct. 2004 Specifications subject to change without notice.
