Mitsubishi Electric MUH-GA35VB Manual de usuario

SERVICE MANUAL

CONTENTS

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

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

3. SPECIFICATION·················································6

4. NOISE CRITERIA CURVES·······························7

5. OUTLINES AND DIMENSIONS ·························8

6. WIRING DIAGRAM ············································9

7. REFRIGERANT SYSTEM DIAGRAM··············10

8. PERFORMANCE CURVES······························11

9. SERVICE FUNCTIONS ····································22

10. TROUBLESHOOTING······································22

11. DISASSEMBLY INSTRUCTIONS·····················29

12. PARTS LIST······················································32

Wireless type

Models

MUH-GA20VB -

MUH-GA25VB -

MUH-GA35VB -E1

No. OB387

HFC

utilized

R410A

SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS

MUH-GA20VB -

MUH-GA25VB -

MUH-GA35VB - E1

Indication of

model name

NOTE:

•This manual describes technical data of outdoor units.

•As for indoor units MSC-GA20/GA25/GA35VB - , refer to the service manual OB385.

•As for indoor units MSC-CA20/CA25/CA35VB - , refer to the service manual OB393.

OB387-1.qxp 05.2.21 10:03 AM Page 1

TECHNICAL CHANGES

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)

MUH-A09YV- ➔MUH-GA25VB-

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. (RA6V33-FB ➔ RA6V33-KB)

5. Outdoor fan motor capacitor has been changed.

6. Compressor capacitor has been changed.

7. Outdoor heat exchanger has been changed. (2 Row ➔1 Row)

MUH-A12YV- ➔MUH-GA35VB-

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. (RA6V33-FB ➔RA6V33-KB)

5. Outdoor fan motor capacitor has been changed.

6. Compressor capacitor has been changed.

7. Size of stop valve (gas) has been changed.([12.7 ➔[9.52)

8. Outdoor heat exchanger has been changed. (2 Row ➔1 Row)

E1E1

OB387-1.qxp 05.2.21 10:03 AM Page 2

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

Non combustible

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

86.5

-40.8

0.94

44.4

Non combustible

0.055

1700

Gas phase

Possible

Compatible oil

Light yellow

Non

Refrigerant

Composition (Ratio)

Refrigerant handling

Chlorine

Safety group (ASHRAE)

Molecular weight

Boiling point (:)

Steam pressure [25:](Mpa)

Saturated steam density [25:](Kg/K)

Combustibility

ODP w1

GWP w2

Refrigerant charge method

Additional charge on leakage

Kind

Color

Smell

w1:Ozone Destruction Parameter : based on CFC-11

w2 :Global Warmth Parameter : based on CO2

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.

1As 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.

2Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and

installation, since it is more susceptible to contaminations than R22.

3For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant

piping.)

4Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent

composition change.

NOTE : 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/ff[Gauge])

New Specification Current Specification

The incompatible refrigeration oil easily separates from

refrigerant and is in the upper layer inside the suction muffler.

Raising position of the oil back hole enables to back the

refrigeration oil of the upper layer to flow back to the

compressor.

Since refrigerant and refrigerating oil are compatible each,

refrigeration oil goes back to the compressor through the

lower position oil back hole.

Compressor

Suction muffler

Oil back hole

Refrigeration oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigeration oil /Refrigerant

Compressor

OB387-1.qxp 05.2.21 10:03 AM Page 3

2.Refrigerant piping

1Specifications

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.

Wall

thickness

Outside diameter

Pipe mm

For liquid

For gas 6.35

9.52 0.8 mm

0.8 mm Heat resisting foam plastic

Specific gravity 0.045 Thickness 8 mm

Insulation material

-30 -20 -10 0 10 20 30 40 50 60

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

(MPa [Gauge])

R410A

R22

Conversion chart of refrigerant temperature and pressure

Saturated liquid pressure

(:)

NOTE :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/ff[Gauge])

R410A tools Can R22 tools be used?

Gas leak detector

R410A has high pressures beyond the measurement range of existing

gauges. Port diameters have been changed to prevent any other refrigerant

from being charged into the unit.

Hose material and cap size have been changed to improve the pressure

resistance.

Dedicated for HFC refrigerant.

6.35 mm and 9.52 mm

Description

Clamp bar hole has been enlarged to reinforce the spring strength in the tool.

Provided for flaring work (to be used with R22 flare tool).

Provided to prevent the back flow of oil. This adapter enables you to use

vacuum pumps.

It is difficult to measure R410Awith a charging cylinder because the

refrigerant bubbles due to high pressure and high-speed vaporization

Yes

New

Gauge manifold

Charge hose

Torque wrench

Flare tool

Flare gauge

Vacuum pump

adapter

Electronic scale for

refrigerant charging

No : Not Substitutable for R410A Yes : Substitutable for R410A

1.Tools dedicated for the air conditioner with R410A refrigerant

The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.

The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being

charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.

OB387-1.qxp 05.2.21 10:03 AM Page 4

R410A

Pipe diameter

6.35

9.52 17

Dimension of flare nut

R22

2Flaring 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”.

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 discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant

circuit.

• Use the vacuum pump for air purging for the purpose of environmental protection.

5.Additional charge

For additional charging, charge the refrigerant from liquid phase of the gas cylinder.

If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the

outdoor unit. In this case, ability of the refrigeration cycle decreases or normal operation can be impossible. However,

charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.

Electronic scale for refrigerant charging

Outdoor unit

Refrigerant gas

cylinder

operating valve

Refrigerant gas cylinder

for R410A with siphon

Refrigerant (liquid)

Service port

Gauge manifold

valve (for R410A)

Union

Liquid pipe

Gas pipe

Stop valve

Indoor unit

Charge hose (for R410A)

OB387-1.qxp 05.2.21 10:03 AM Page 5

PART NAMES AND FUNCTIONS

( )

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

ACCESSORIES

MUH-GA20VB-

MUH-GA25VB-

MUH-GA35VB- E1

Drain socket 1

SPECIFICATION

Capacity

Dehumidification

Outdoor air flow

Power outlet

Running current

Power input

Auxiliary heater

Power factor

Starting current

Compressor motor current

Fan motor current

Model

Output

Winding

resistance (at 20:)

Model

Winding

resistance (at 20:)

Dimensions WOHOD

Weight

Sound level

Fan speed

Fan speed regulator

Refrigerant filling

capacity (R410A)

Refrigeration oil (Model)

Thermistor RT61 (at 0:)

R/h

K/h

A(kW)

rpm

MUH-GA20VB - E1

Single phase

230V,50Hz

1800

—

0.25

RN092VHSHT

600

C-R 3.87

C-S 6.14

RA6V21-AD

WHT-BLK 366

BLK-RED 274

800o550o285

745

0.65

350 (NEO22)

33.18

Cooling

2.3

0.9

3.00

680

2.76

3.22

Heating

2.5

—

2.86

655

100

2.62

3.62

MUH-GA25VB - E1

Single phase

230V,50Hz

1902

—

0.33

RN104VHSHT

700

C-R 3.40

C-S 4.56

RA6V33-KB

WHT-BLK 215

BLK-RED 307

800o550o285

855

0.80

350 (NEO22)

33.18

Cooling

2.65

1.1

3.43

785

100

3.10

3.23

Heating

3.0

—

3.43

785

100

3.10

3.66

MUH-GA35VB - E1

Single phase

230V,50Hz

1902

—

0.33

RN135VHSHT

900

C-R 2.79

C-S 3.36

RA6V33-KB

WHT-BLK 215

BLK-RED 307

800o550o285

855

0.80

620 (NEO22)

33.18

Cooling

3.5

1.7

4.65

1,050

4.32

3.21

Heating

3.7

—

4.34

980

4.01

3.63

Compressor

Electrical

data

Fan

motor

Special

remarks

Capacity

Coefficient of performance (C.O.P)

Outdoor unit power supply

Function

Outdoor model

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C

Outdoor DB35°C WB24°C Outdoor DB 7°C/WB 6°C

Indoor-Outdoor piping length : 5m

OB387-1.qxp 05.2.21 10:03 AM Page 6

NOISE CRITERIA CURVES

10 63 125 250 500 1000 2000 4000 8000

APPROXIMATE

TERESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling :DB35:WB24:

Heating :DB 7:WB 6:

MUH-GA25VB- E1

MUH-GA35VB- E1 COOLING

FUNCTION

HEATING

SPL(dB(A)) LINE

OUTDOORUNIT

MICROPHONE

10 63 125 250 500 1000 2000 4000 8000

APPROXIMATE

TERESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling :DB35:WB24:

Heating :DB 7:WB 6:

MUH-GA20VB- E1 COOLING

FUNCTION

HEATING

SPL(dB(A)) LINE

OB387-1.qxp 05.2.21 10:03 AM Page 7

OUTLINES AND DIMENSIONS

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

400

Air in

Air out

Air in

17.5

Bolt pitch for

installation

304~325

Liquid refrigerant pipe joint

Refrigerant pipe (flared) [6.35

Gas refrigerant pipe joint

Refrigerant pipe (flared) [9.52

43-

35-

2 holes 10X21

(MUH-GA25

/GA35VB)

REQUIRED SPACE Basically open 100mm or more

without any obstruction in front

and on both sides of the unit.

350mm or more

200mm or more

100mm or more

Open two sides of left,

right, or rear side.

Drain hole [42

Unit: mm

OUTDOOR UNIT

MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - E1E1E1

OB387-1.qxp 05.2.21 10:03 AM Page 8

WIRING DIAGRAM

MODELS WIRING DIAGRAM

SYMBOL

T61

TB1,TB2

21S4

52C

SYMBOL

NR61

RT61

SR61,SR62

SYMBOL

C65

DSAR

F61

NAME NAME NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE(2A)

COMPRESSOR(INNER PROTECTOR)

VARISTOR

DEFROST THERMISTOR

SOLID STATE RELAY

TRANS FORMER

TERMINAL BLOCK

R.V. COIL

COMPRESSOR CONTACTOR

OUTDOOR FAN MOTOR

(INNER FUSE)

TAB20

TB2

TB1

BRN

321

CN711

CN730

BLU

NR61

RT61

21S4

CN661

C65

123

SR61

SR62

CN721

T61

WHT

RED

BLK

F61

BRN

DSAR

CIRCUIT

BREAKER

BLU

POWER SUPPLY

~/N 230V 50Hz

12V

TO INDOOR

UNIT

CONNECTING

RED

BLK

GRN/YLW

52C

BLK

WHT

RED

OUTDOOR UNIT

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

2. Use copper conductors only. (For field wiring)

3. Symbols below indicate.

/: Terminal block, : Connector

MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - E1E1E1

OB387-1.qxp 05.2.21 10:03 AM Page 9

REFRIGERANT SYSTEM DIAGRAM

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[1.4x300 (MUH-GA35VB)

Check valve

Strainer

#100

Refrigerant pipe [6.35

(with heat insulator) Refrigerant flow in cooling

Refrigerant flow in heating

Unit:mm

Stop valve

(with service

port)

R.V. coil

heating ON

cooling OFF

Flared connection

Compressor

Stop valve

MUH-GA20VB - MUH-GA25VB - MUH-GA35VB - E1E1E1

OB387-1.qxp 05.2.21 10:03 AM Page 10

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