Mitsubishi MSC-GA20VB- Manuals

Mitsubishi MSC-GA20VB– User Manual in PDF format online.

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User Manual

User Manual Mitsubishi MSC-GA20VB

Summary

Page 2 - TECHNICAL CHANGES

TECHNICAL CHANGES 2 1 MUH-A07YV- ➔ MUH-GA20VB- 1. Indication of capacity has been changed. (BTU base ➔ kw) 2. Dimension of outdoor unit has been changed. (W780mm x H540mm x D255mm ➔ W800mm x H550mm x D285mm) 3. Stop valve cover has been added.4. Outdoor fan motor has been changed. (RC6V20-AB ➔ RA6V2...

Page 3 - PART NAMES AND FUNCTIONS; OUTDOOR UNIT; SPECIFICATION

3 PART NAMES AND FUNCTIONS 2 ( ) Air inlet Air outlet Drain outlet Piping Drain hose back : MUH-GA20VBback and side : MUH-GA25VB MUH-GA35VB OUTDOOR UNIT MUH-GA20VBMUH-GA25VBMUH-GA35VB ACCESSORIES MUH-GA20VBMUH-GA25VBMUH-GA35VB Drain socket 1 <Outdoor unit: MUH type> 1 SPECIFICATION 3 CapacityD...

Page 5 - NOISE CRITERIA CURVES

5 NOISE CRITERIA CURVES 4 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCT A VE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR BAND CENTER FREQUENCIES, Hz Test conditions, Cooling :DB35 : WB24 :...

Page 6 - OUTLINES AND DIMENSIONS

6 OUTLINES AND DIMENSIONS 5 10 69 800 302.5 500 Bolt pitch for installation 150 22.3 Handle 550 280 164.5 99.5 170.5 23 Service panel Service port 285 344.5 44 400 Air in Air out Air in 17.5 Bolt pitch for installation 304~325 40 Liquid refrigerant pipe jointRefrigerant pipe (flared) [ 6.35 Gas refr...

Page 7 - WIRING DIAGRAM; MC; DSAR; MF

7 WIRING DIAGRAM 6 SYMBOL T61 TB1,TB2 21S4 52C SYMBOL MF NR61 RT61 SR61,SR62 SYMBOL C1 C65 DSAR F61 MC NAME NAME NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(T2AL250V) COMPRESSOR(INNER PROTECTOR) VARISTOR DEFROST THERMISTOR SOLID STATE RELAY TRANSFORMER TERMINAL BLOCK R.V. COI...

Page 8 - REFRIGERANT SYSTEM DIAGRAM

8 REFRIGERANT SYSTEM DIAGRAM 7 OUTDOOR UNIT (with heat insulator) Refrigerant pipe [ 9.52 4-way valve DefrostthermistorRT61 Muffler Outdoorheatexchanger Capillary tube [ 3.0x [ 1.4x700 (MUH-GA20VB - ) [ 3.0x [ 1.4x900 (MUH-GA20VB - ) [ 3.0x [ 1.4x1000(MUH-GA25VB - ) [ 3.0x [ 1.6x1500(MUH-GA25VB - ) ...

Page 9 - MAX. HEIGHT DIFFERENCE; PERFORMANCE CURVES

9 Length of connecting pipe : m Indoor unit Gas 0.43 Liquid 0.5 Piping size O.D : mm Liquid 6.35 Gas 9.52 Outdoor unit Gas 0 Liquid 0 Model MUH-GA20VB MUH-GA25VB MUH-GA35VB 20 10 25 Refrigerant piping : m Max. length A Max. height B Indoor unit Max. height B Outdoor unit Refrigerant Piping Max. leng...

Page 10 - INDOOR UNIT

10 MSC-GA20VB MUH-GA20VB MUH-GA35VB MSC-GA35VB MUH-GA25VB MSC-GA25VB 8.5 7.8 7.1 6.4 5.8 5.1 10.0 9.2 8.3 7.5 6.8 6.0 11.0 10.0 9.1 8.2 7.4 6.5 20.0 18.5 16.9 15.4 13.9 12.3 10.8 9.2 19.2 17.8 16.3 14.8 13.3 11.8 10.4 8.9 MSC-GA20VB MUH-GA20VB MUH-GA25VB MSC-GA25VB MUH-GA35VB MSC-GA35VB 24.0 22.1 20...

Page 12 - HEAT operation

12 HEAT operation Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 6,12,14.5°C 7 21 230V 5 10 15 20 25 3 4 5 6 ( : ) 7 21 230V ( : ) 5 10 15 20 25 2 3 4 5 7 21 230V 5 10 15 20 25 2 3 4 5 ( : ) Outdoor unit current (A...

Page 19 - ACTUATOR CONTROL

19 MSC-GA20VB : MUH-GA20VB PERFORMANCE DATAHEAT operation (230V) MSC-GA25VB : MUH-GA25VB 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 CAPACITY : 2.5(kW) INPUT : 690(W) 152126 1.581.501.35 449483518 1.901.801.68 538573607 2.232.131.98 6076...

Page 20 - TROUBLESHOOTING; SERVICE FUNCTIONS; 0-1. COMPULSORY DEFROSTING MODE FOR SERVICE

20 TROUBLESHOOTING 11 3. Troubleshooting procedure 1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. 2) If the electr...

Page 22 - Check of outdoor unit

22 A A Check of outdoor unit Compressor and/or outdoor fan motor doesn’t operate. Yes Compressor doesn't operate. Yes Yes Is there 230V AC between 3 on the compressor contactor (52C) and N on the outdoor terminal block (TB1)? Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION ...

Page 24 - How to check mis-wiring and serial signal error

24 D D How to check mis-wiring and serial signal error Serial signal error is indicated.(0.5-sec. ON, 0.5-sec. OFF) 1. Turn OFF the power supply (indoor/outdoor unit) and disconnect indoor and outdoor connecting wire on indoor side. 2. Short-circuit between indoor terminal block N and 3 . 3. Turn ON...

Page 25 - Check of outdoor thermistor

25 E E Check of outdoor thermistor Measure resistance between CN 661 1 and 2 . No Yes Replace the thermistor. Defrost thermistor (RT61) Reconnect CN661.Turn ON the power supply and press the EMERGENCY OPERATION switch. Is the resistance of thermistor normal? No Yes Does the unit operate 10 minutes o...

Page 27 - DISASSEMBLY INSTRUCTIONS; Removing the cabinet; Photo 1

27 DISASSEMBLY INSTRUCTIONS 12 MUH-GA20VB MUH-GA25VB MUH-GA35VB OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the top panel.(2) Remove the screw of the service panel.(3) Remove the screws of the cabinet.(4) Remove the screws of the front panel and motor sup...

Page 28 - OPERATING PROCEDURE; Photo 4

28 3. Removing the propeller and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.)(2) Remove the propeller nut.(3) Remove the propeller.NOTE : Loose the propeller in the rotating direction for removal.When attaching the propeller, align the mark on thepropeller and the motor shaft cut sect...

Page 29 - Removing the compressor

29 OPERATING PROCEDURE PHOTOS 4. Removing the compressor (1) Remove the cabinet. (Refer to 1.)(2) Remove the relay panel.(3) Remove the soundproof felt.(4) Remove the terminal cover on the compressor.(5) Disconnect lead wires from the glass terminal of the com- pressor. (6) Recover gas from the refr...

Page 30 - STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

30 PARTS LIST (non-RoHS compliant) 13 22 3 5 2 21 1 15 MUH-GA20VB MUH-GA25VB MUH-GA35VB 4 17 14 19 20 18 13 6 7 8 9 10 11 12 16 23 This figure shows MUH-GA20VB. 24 13-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS OB387B-1.qxp 07.5.23 2:48 PM Page 30

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