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OB387-1.qxp 05.2.21 10:03 AM Page 1
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
No. OB387
HFC
utilized
R410A
SERVICE MANUAL
Wireless type
Models
E1
MUH-GA20VB -
E1
MUH-GA25VB -
E1
MUH-GA35VB -
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················6
3. SPECIFICATION·················································6
4. NOISE CRITERIA CURVES·······························7
Indication of
5. OUTLINES AND DIMENSIONS ······················
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OB387-1.qxp 05.2.21 10:03 AM Page 2 1 TECHNICAL CHANGES E1 E1 MUH-A07YV- MUH-GA20VB- 1. Indication of capacity has been changed. (BTU base kw) 2. Dimension of outdoor unit has been changed. (780Wo540Ho255D 800Wo550Ho285D) 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 changed. 6. Compressor capacitor has been changed. 7. Outdoor heat exchanger has been changed. (L-BEND FLAT) E1 E1 MUH-A09YV- M
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OB387-1.qxp 05.2.21 10:03 AM 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 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. 2 Take suf
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OB387-1.qxp 05.2.21 10:03 AM Page 4 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) 4.0 3.5 R410A 3.0 R22 2.5 2.0 NOTE : The unit of pressure has been changed to MPa on the 1.5 international system of units(SI unit system). 1.0 The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/f f [Gauge]) 0.5 0.0 -0.5 -30 -20 -10 0 10 20 30 40 50 60 (:) 1.Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant. Some R22 too
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OB387-1.qxp 05.2.21 10:03 AM 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 R410A mm R22 6.35 17 17 9.52 22 22 3.Refrigeration 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. Take care not to disc
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OB387-1.qxp 05.2.21 10:03 AM Page 6 2 PART NAMES AND FUNCTIONS OUTDOOR UNIT ACCESSORIES E1 E1 MUH-GA20VB - MUH-GA20VB- E1 E1 MUH-GA25VB- MUH-GA25VB - E1 E1 MUH-GA35VB - MUH-GA35VB- Air inlet back : MUH-GA20VB back and side : MUH-GA25VB ( ) 1 Drain socket 1 MUH-GA35VB Piping Drain hose Air outlet Drain outlet 3 SPECIFICATION E1 E1 E1 MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - Outdoor model Single phase
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OB387-1.qxp 05.2.21 10:03 AM Page 7 4 NOISE CRITERIA CURVES SPL(dB(A)) LINE SPL(dB(A)) LINE FUNCTION FUNCTION MUH-GA25VB- E1 MUH-GA20VB- E1 COOLING COOLING 49 47 MUH-GA35VB- E1 HEATING HEATING Test conditions, Test conditions, Cooling :DB35: WB24: Cooling :DB35: WB24: Heating :DB 7: WB 6: Heating :DB 7: WB 6: 90 90 80 80 70 70 NC-70 NC-70 60 60 NC-60 NC-60 50 50 NC-50 NC-50 40 40 NC-40 NC-40 30 30 NC-30 NC-30 APPROXIMATE APPROXIMATE 20 20 TERESHOLD OF TERESHOLD OF HEARING FOR HEARING
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100mm or more 350mm or more OB387-1.qxp 05.2.21 10:03 AM Page 8 5 OUTLINES AND DIMENSIONS E1 E1 E1 Unit: mm MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - OUTDOOR UNIT REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit. 400 Drain hole [42 Air in Air in (MUH-GA25 /GA35VB) Open two sides of left, 40 2 holes 10X21 right, or rear side. Service panel Air out 23 22.3 Liquid refrigerant pipe joint Handle Refrigerant pipe (flared) [6.35 Gas refrigera
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OB387-1.qxp 05.2.21 10:03 AM Page 9 6 WIRING DIAGRAM E1 E1 E1 MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - MODELS WIRING DIAGRAM OUTDOOR UNIT 21S4 RT61 TB2 RED CN661 CN721 3 CN711 BLK WHT N BLK CIRCUIT MF BREAKER RED SR61 TB1 L T61 BLU N TAB20 52C BRN WHT PE 4 3 C BLU RED S MC R C1 BLK NAME SYMBOL SYMBOL NAME SYMBOL NAME TRANS FORMER C1 COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR T61 MF (INNER FUSE) C65 OUTDOOR FAN CAPACITOR TB1,TB2 TERMINAL BLOCK DSAR SURGE ABSORBER NR61 VARISTOR 21S4 R.V. COIL F61 FUSE
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OB387-1.qxp 05.2.21 10:03 AM Page 10 7 REFRIGERANT SYSTEM DIAGRAM Unit:mm E1 E1 E1 MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - OUTDOOR UNIT Refrigerant pipe [ 9.52 4-way valve (with heat insulator) Stop valve Outdoor (with service heat port) Defrost Flared connection Muffler exchanger thermistor RT61 Compressor Capillary tube [3.0x[1.4x700 (MUH-GA20VB) [3.0x[1.4x1000(MUH-GA25VB) Flared connection [3.0x[1.4x500 (MUH-GA35VB) Check valve R.V. coil Strainer heating ON #100 cooling OFF Capillary tube
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OB387-1.qxp 05.2.21 10:03 AM Page 11 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Max. length : m Model Gas Liquid Indoor unit Outdoor unit A MUH-GA20VB - E1 Gas 0.43 Gas 0 20 MUH-GA25VB - E1 9.52 6.35 Liquid 0 Liquid 0.5 MUH-GA35VB - E1 25 MAX. HEIGHT DIFFERENCE Indoor unit Height difference should be within Refrigerant Piping 10m regardless of which unit, Max.length w Max. Height indoor or o
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OB387-1.qxp 05.2.21 10:03 AM Page 12 How to measure the indoor air wet-bulb/dry-bulb temperature difference 1. Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high. 2. Attach at least 2 sets of wet-and dry-bulb thermometers to the outdoor air intake. Cover the thermometers to prevent di
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OB387-1.qxp 05.2.21 10:03 AM Page 13 8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation ‹ Both indoor and outdoor unit are under the same temperature/humidity condition. Relative humidity(%) Dry-bulb temperature 20 50 25 60 30 70 ` Air flow should be set at MAX. fi The unit of pressure has been changed to MPa on the international system of units(SI unit system). The conversion factor is : 1(MPa[Gauge]) =10.2(kgf/f f[Gauge] ) E1 E1 (kgf/F[Gauge])(MPa[Gauge]) MUH-GA20VB - MUH-GA20VB
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OB387-1.qxp 05.2.21 10:03 AM Page 14 HEAT operation Condition indoor:Dry bulb temperature 20.0°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 14.5°C Wet bulb temperature 6,12,14.5°C E1 E1 MUH-GA25VB - MUH-GA20VB - 5 5 230V 4 4 230V 3 3 2 2 5 7 10 15 20 21 25(:) 21 (:) 5 7 10 15 20 25 Ambient temperature(˚C) Ambient temperature(˚C) E1 MUH-GA35VB - 6 230V 5 4 3 5 10 15 20 21 25(:) 7 Ambient temperature(˚C) 14 Outdoor unit current (A) Outdoor unit current (A) Outdoor unit current (
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OB387-1.qxp 05.2.21 10:03 AM Page 15 PERFORMANCE DATA COOL operation (230V) E1 E1 MSC-GA20VB - : MUH-GA20VB - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 715(W) OUTDOOR DB(:) 21 25 27 30 INDOOR INDOOR Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT DB(:) WB(:) 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 1.4
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OB387-1.qxp 05.2.21 10:03 AM Page 16 PERFORMANCE DATA COOL operation (230V) E1 E1 MSC-GA20VB - : MUH-GA20VB - CAPACITY : 2.3(kW) SHF : 0.74 INPUT : 715(W) OUTDOOR DB(:) INDOOR INDOOR 35 40 43 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 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.
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OB387-1.qxp 05.2.21 10:03 AM Page 17 PERFORMANCE DATA COOL operation (230V) E1 E1 MSC-GA25VB - : MUH-GA25VB - CAPACITY : 2.65(kW) SHF : 0.70 INPUT : 820(W) OUTDOOR DB(:) INDOOR INDOOR 21 25 27 30 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 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.
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OB387-1.qxp 05.2.21 10:03 AM Page 18 PERFORMANCE DATA COOL operation (230V) E1 E1 MSC-GA25VB - : MUH-GA25VB - CAPACITY : 2.65(kW) SHF : 0.70 INPUT : 820(W) OUTDOOR DB(:) INDOOR INDOOR 35 40 43 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 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
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OB387-1.qxp 05.2.21 10:03 AM Page 19 PERFORMANCE DATA COOL operation (230V) E1 E1 MSC-GA35VB - : MUH-GA35VB - CAPACITY : 3.5(kW) SHF : 0.66 INPUT : 1090(W) OUTDOOR DB(:) 21 25 27 30 INDOOR INDOOR Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT DB(:) WB(:) 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
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OB387-1.qxp 05.2.21 10:03 AM Page 20 PERFORMANCE DATA COOL operation (230V) E1 E1 MSC-GA35VB - : MUH-GA35VB - CAPACITY : 3.5(kW) SHF : 0.66 INPUT : 1090(W) OUTDOOR DB(:) INDOOR INDOOR 35 40 43 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 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
