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Pioneer MUH-GA20VB manual

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Table of contents for the manual

  • Page 1

    SER VICE MANUAL CONTENTS 1. TECHNICAL CHANGES ····································2 2. P ART NAMES AND FUNCTIONS ······················6 3. SPECIFICA TION·················································6 4. NOISE CRITERIA CUR VES ······[...]

  • Page 2

    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. ( 780W o 540H o 255D ➔ 800W o 550H o 285D) 3. Stop valve cover has been added. 4. Outdoor fan motor has been changed. (RC6V20-AB ➔ RA6V21-AD) 5. Outdoor fan motor capacitor has been chang[...]

  • Page 3

    3 Refrigeration oil Refrigerant New refrigerant R410A HFC-32: HFC-125 (50%:50%) Pseudo-azeotropic refrigerant Not included A1/A1 72.6 -51.4 1.557 64 Non combustible 0 1730 From liquid phase in cylinder Possible Incompatible oil Non Non Previous refrigerant R22 R22 (100%) Single refrigerant Included A1 86.5 -40.8 0.94 44.4 Non combustible 0.055 1700[...]

  • Page 4

    4 2.Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. • Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less than 0.8mm, as the pressure resistance is insufficient. W all thickness Outside diameter Pipe mm For liquid For gas 6.35 [...]

  • Page 5

    5 R410A Pipe diameter mm 6.35 9.52 17 22 Dimension of flare nut R22 17 22 2 Flaring work and flare nut Flaring work for R410A pipe dif fers from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. 3.Refrigeration oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare [...]

  • Page 6

    6 P ART NAMES AND FUNCTIONS 2 ( ) Air inlet Air outlet Drain outlet Piping Drain hose back : MUH-GA20VB back and side : MUH-GA25VB MUH-GA35VB OUTDOOR UNIT MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - E1 E1 E1 ACCESSORIES MUH-GA20VB- MUH-GA25VB- MUH-GA35VB- E1 E1 E1 Drain socket 1 <Outdoor unit: MUH type> 1 SPECIFICA TION 3 Capacity Dehumidification[...]

  • Page 7

    7 NOISE CRITERIA CUR VES 4 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMA TE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCT AVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR BAND CENTER FREQUENCIES, Hz T est conditions, Cooling :DB35 : WB24 : Heating :DB 7 : WB 6 : MUH-GA25VB- E1 MUH-G[...]

  • Page 8

    8 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 joint Refrigerant pipe (flared) [ 6.35 Gas refrigerant pipe joint Refrigerant pipe (flared) [ 9.[...]

  • Page 9

    9 WIRING DIAGRAM 6 MODELS WIRING DIAGRAM SYMBOL T61 TB1,TB2 21S4 52C SYMBOL MF NR61 RT61 SR61,SR62 SYMBOL C1 C65 DSAR F61 MC NAME NAME NAME COMPRESSOR CAP ACIT OR OUTDOOR F AN CAP ACIT OR SURGE ABSORBER FUSE(2A) COMPRESSOR(INNER PROTECTOR) V ARIST OR DEFROST THERMISTOR SOLID ST A TE RELA Y TRANS FORMER TERMINAL BLOCK R.V . COIL COMPRESSOR CONT ACT [...]

  • Page 10

    10 REFRIGERANT SYSTEM DIAGRAM 7 OUTDOOR UNIT (with heat insulator) Refrigerant pipe [ 9.52 4-way valve Defrost thermistor RT61 Muffler Outdoor heat exchanger Capillary tube [ 3.0x [ 1.4x700 (MUH-GA20VB) [ 3.0x [ 1.4x1000(MUH-GA25VB) [ 3.0x [ 1.4x500 (MUH-GA35VB) Capillary tube [ 3.0x [ 1.4x500 (MUH-GA20VB) [ 3.0x [ 1.4x600 (MUH-GA25VB) [ 3.0x [ 1.4[...]

  • Page 11

    11 Piping size O.D : mm Length of connecting pipe : m Model Refrigerant piping Max. length : m A 20 25 Indoor unit Gas 0.43 Liquid 0.5 Liquid 6.35 Gas 9.52 Outdoor unit Gas 0 Liquid 0 MUH-GA20VB - E1 MUH-GA25VB - E1 MUH-GA35VB - E1 Indoor unit w Max. Height difference 10m Height difference should be within 10m regardless of which unit, indoor or ou[...]

  • Page 12

    12 MSC-GA20VB - E1 MUH-GA20VB - E1 MUH-GA35VB - E1 MSC-GA35VB - E1 MUH-GA25VB - E1 MSC-GA25VB - E1 8.5 7.8 7.1 6.4 5.8 5.1 10.0 9.2 8.3 7.5 6.8 6.0 1 1.0 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 1 1.8 10.4 8.9 MSC-GA20VB - E1 MUH-GA20VB - E1 MUH-GA25VB - E1 MSC-GA25VB - E1 MUH-GA35VB - E1 MSC-GA35VB - E1 [...]

  • Page 13

    13 8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation ① Both indoor and outdoor unit are under the same temperature/humidity condition. ➁ Air flow should be set at MAX. Dry-bulb temperature Relative humidity(%) 20 50 25 60 30 70 ③ The unit of pressure has been changed to MPa on the international system of units(SI unit system). [...]

  • Page 14

    14 HEA T 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) Outdoor unit current (A) Outdoor unit curre[...]

  • Page 15

    15 MSC-GA20VB - : MUH-GA20VB - E1 E1 PERFORMANCE DA T A COOL operation (230V) 21 18 2.70 1.51 0.56 572 2.59 1.45 0.56 601 2.48 1.39 0.56 629 2.39 1.34 0.56 658 21 20 2.82 1.24 0.44 601 2.70 1.19 0.44 636 2.62 1.15 0.44 651 2.53 1.11 0.44 679 22 18 2.70 1.62 0.60 572 2.59 1.55 0.60 601 2.48 1.49 0.60 629 2.39 1.44 0.60 658 22 20 2.82 1.35 0.48 601 2[...]

  • Page 16

    16 MSC-GA20VB - : MUH-GA20VB - E1 E1 PERFORMANCE DA T A COOL operation (230V) 21 18 2.25 1.26 0.56 701 2.07 1.16 0.56 744 1.99 1.11 0.56 758 21 20 2.37 1.04 0.44 729 2.21 0.97 0.44 765 2.13 0.94 0.44 787 22 18 2.25 1.35 0.60 701 2.07 1.24 0.60 744 1.99 1.19 0.60 758 22 20 2.37 1.14 0.48 729 2.21 1.06 0.48 765 2.13 1.02 0.48 787 22 22 2.51 0.90 0.36[...]

  • Page 17

    17 MSC-GA25VB - : MUH-GA25VB - E1 E1 PERFORMANCE DA T A COOL operation (230V) 21 18 3.11 1.62 0.52 656 2.98 1.55 0.52 689 2.86 1.49 0.52 722 2.76 1.43 0.52 754 21 20 3.25 1.30 0.40 689 3.11 1.25 0.40 730 3.02 1.21 0.40 746 2.92 1.17 0.40 779 22 18 3.11 1.74 0.56 656 2.98 1.67 0.56 689 2.86 1.60 0.56 722 2.76 1.54 0.56 754 22 20 3.25 1.43 0.44 689 3[...]

  • Page 18

    18 MSC-GA25VB - : MUH-GA25VB - E1 E1 PERFORMANCE DA T A COOL operation (230V) 21 18 2.60 1.35 0.52 804 2.39 1.24 0.52 853 2.29 1.19 0.52 869 21 20 2.73 1.09 0.40 836 2.54 1.02 0.40 877 2.45 0.98 0.40 902 22 18 2.60 1.45 0.56 804 2.39 1.34 0.56 853 2.29 1.28 0.56 869 22 20 2.73 1.20 0.44 836 2.54 1.12 0.44 877 2.45 1.08 0.44 902 22 22 2.89 0.92 0.32[...]

  • Page 19

    19 MSC-GA35VB - : MUH-GA35VB - E1 E1 PERFORMANCE DA T A COOL operation (230V) 21 18 4.11 1.97 0.48 872 3.94 1.89 0.48 916 3.78 1.81 0.48 959 3.64 1.75 0.48 1003 21 20 4.29 1.54 0.36 916 4.11 1.48 0.36 970 3.99 1.44 0.36 992 3.85 1.39 0.36 1036 22 18 4.11 2.14 0.52 872 3.94 2.05 0.52 916 3.78 1.97 0.52 959 3.64 1.89 0.52 1003 22 20 4.29 1.72 0.40 91[...]

  • Page 20

    20 MSC-GA35VB - : MUH-GA35VB - E1 E1 PERFORMANCE DA T A COOL operation (230V) 21 18 3.43 1.65 0.48 1068 3.15 1.51 0.48 1134 3.03 1.45 0.48 1155 21 20 3.61 1.30 0.36 1112 3.36 1.21 0.36 1166 3.24 1.17 0.36 1199 22 18 3.43 1.78 0.52 1068 3.15 1.64 0.52 1134 3.03 1.57 0.52 1155 22 20 3.61 1.44 0.40 1112 3.36 1.34 0.40 1166 3.24 1.30 0.40 1199 22 22 3.[...]

  • Page 21

    21 MSC-GA20VB - : MUH-GA20VB - E1 E1 PERFORMANCE DA T A HEA T operation (230V) MSC-GA25VB - : MUH-GA25VB - E1 E1 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 CAP ACITY : 2.5(kW) INPUT : 690(W) 15 21 26 1.58 1.50 1.35 449 483 518 1.90 1.80 1.68 538 573 607 2.23 2.13 1.98 607 635 669 2.55 [...]

  • Page 22

    22 TROUBLESHOOTING 10 3. T roubleshooting procedure 1) First, check if the OPERA TION INDICA TOR lamp on the indoor unit is flashing on and off to indicate an abnormality . T o make sure, check how many times the abnormality indication is flashing on and of f before starting service work. 2) If the electronic control P .C. board is supposed to be d[...]

  • Page 23

    23 10-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Indoor unit doesn't receive the signal from remote controller . Indoor unit operates. Outdoor unit doesn't operate normally . OPERA TION INDICA T OR lamp on the indoor unit is flashing on and off. Outdoor unit operates in only T est Run [...]

  • Page 24

    24 A A Check of outdoor unit Compressor and/or outdoor fan motor doesn’t operate. Y es Compressor doesn't operate. Y es Y es 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 HEA T mode by pressing the EMERGENCY OPERATION switch. 3-minute time delay works. T es[...]

  • Page 25

    25 B B Check of outdoor unit Does compressor stop? No Y es Is there 230V AC between 3 on the compressor contactor (52C) and N on the outdoor terminal block (TB1)? Replace the deicer P .C. board. Y es OK No Does outdoor fan motor stop? Replace the deicer P .C. board. Y es OK No Rectify the connecting wire. Start T urn OFF the power supply . After 1 [...]

  • Page 26

    26 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. T urn 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. T urn ON the power supply (indoor unit) and press once [...]

  • Page 27

    27 E E Check of outdoor thermistor Measure resistance between CN 661 1 and 2 . No Y es Replace the thermistor . Defrost thermistor (RT61) Reconnect CN661. T urn ON the power supply and press the EMERGENCY OPERA TION switch. Is the resistance of thermistor normal? No Y es Does the unit operate 10 minutes or more? Replace the deicer P .C. board. OK ?[...]

  • Page 28

    28 MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - Outdoor deicer P .C. board E1 E1 E1 CN71 1 Outdoor fan motor 230V AC CN721 R.V . coil 230V AC F61 Fuse 2A/250V } } CN661 1 - 2 Defrost thermistor RT61 } 12V DC J204 J101 R601 5~10VDC } -- + 5V DC J205 J101 -- + -- + Power supply input 230V AC } NR61 V aristor Jumper wire for change in defrost setting (JRF ,[...]

  • Page 29

    29 DISASSEMBL Y INSTRUCTIONS 11 MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - OUTDOOR UNIT E1 E1 E1 OPERA TING 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 support. (5) Remove the service p[...]

  • Page 30

    30 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 the propeller and the motor shaft cut section. Set the propeller in position by using[...]

  • Page 31

    31 OPERA TING 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 refrigerant circuit. NOTE : Recover gas from th[...]

  • Page 32

    32 P ARTS LIST 12 22 3 5 2 21 1 ( W ) 15 12-1. OUTDOOR UNIT STRUCTURAL P ARTS MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - E1 E1 E1 4 17 14 19 20 18 13 6 7 8 9 10 1 1 12 16 23 ( W ) This figure shows MUH-GA20VB. 24 OB387-2.qxp 05.2.21 10:03 AM Page 32[...]

  • Page 33

    33 Part numbers that are circled are not shown in the illustration. 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 E02 904 630 E02 905 630 E02 906 630 E02 904 301 E02 905 301 E02 899 232 E02 903 232 E02 927 521 E02 665 501 E02 899 290 E02 905 290 E02 075 506 E02 742 900 E02 753 900 E02 754 900 E02 904 661 [...]

  • Page 34

    34 OB387-2.qxp 05.2.21 10:03 AM Page 34[...]

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    35 OB387-2.qxp 05.2.21 10:03 AM Page 35[...]

  • Page 36

    C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,L TD Distributed in Feb. 2005. No.OB387 6 Made in Japan New publication, effective Feb. 2005 Specifications subject to change without notice. HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, T OKYO100-8310, JAP AN OB387-2.qxp 05.2.21 10:03 AM Page 36[...]