Mitsubishi Electric MUH-GA50VB-E1 Manual de usuario

SERVICE MANUAL

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················5

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

4. NOISE CRITERIA CURVES·······························8

5. OUTLINES AND DIMENSIONS ·························9

6. WIRING DIAGRAM ··········································10

7. REFRIGERANT SYSTEM DIAGRAM··············12

8. PERFORMANCE CURVES······························15

9. SERVICE FUNCTIONS ····································25

10. TROUBLESHOOTING······································25

11. DISASSEMBLY INSTRUCTIONS·····················35

12. PARTS LIST······················································39

13. RoHS PARTS LIST···········································46

Wireless type

Models

MUH-GA50VB -

MUH-GA60VB -

MUH-GA80VB - E1

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

MUH-GA50VB

NOTE:

This service manual describes technical data of outdoor units.

RoHS compliant products have <G> mark on the spec name plate.

For servicing of RoHS compliant products, refer to the RoHS Parts List.

HFC

utilized

R410A

OUTDOOR UNIT No. OB368

REVISED EDITION-B

Please void OB368 REVISED EDITION-A.

Revision:B

• MUH-GA50VB- has been added.

Indoor unit service manual

MSH-GA•VB Series (OB367)

OB368B-1.qxp 07.5.21 8:06 PM Page 1

Refrigerating

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 Depletion Potential : based on CFC-11

w2 :Global Warming Potential : based on CO2

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

•This room air conditioner adopts an 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.

TECHNICAL CHANGES

MUH-A18WV - ➔MUH-GA50VB -

1. Oil separator has been removed.

2. Model name has been changed.

Indication of capacity has been changed. (BTU➔kW)

MUH-A24WV - ➔MUH-GA60VB -

MUH-A30WV - ➔MUH-GA80VB -

1. Model name has been changed.

Indication of capacity has been changed. (BTU➔kW)

MUH-GA50VB - ➔MUH-GA50VB -

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

2. Outdoor fan motor has been changed.

3. Oil separator has been added.

E2E1

E1E1

Revision:A

•RoHS PARTS LIST has been added.

Revision:B

•MUH-GA50VB- has been added.

OB368B-1.qxp 07.5.21 8:06 PM Page 2

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 refrigeration oil are compatible each,

refrigeration oil backs 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

-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

No 12.7 mm and 15.88 mm

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.

OB368B-1.qxp 07.5.21 8:06 PM Page 3

R410A

Pipe diameter

6.35

9.52

12.7

15.88

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.Refrigerantion 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 refrigerating 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.

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 (6.35, 9.52, 12.7), 1.0 mm (15.88).

Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88), as the pressure resistance is

insufficient.

Wall

thickness

Outside diameter

Pipe mm

For liquid

For gas

6.35

9.52

12.7

15.88

0.8 mm

1.0 mm

Heat resisting foam plastic

Specific gravity 0.045 Thickness 8 mm

Insulation material

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)

OB368B-1.qxp 07.5.21 8:06 PM Page 4

PART NAMES AND FUNCTIONS

Drainage hose

Piping

Air inlet Air inlet

Air outlet

Drain outlet

(back and side)

Air outlet

(back and side)

ACCESSORIES

MUH-GA50VB

Drain socket

Drain cap {33

Drain cap {16

—

MUH-GA50VB MUH-GA60VB

MUH-GA80VB

MUH-GA60VB MUH-GA80VB

OB368B-1.qxp 07.5.21 8:06 PM Page 5

WHT-BLK 71.2

BLK-RED 89.3

WHT-BLK 79.5

BLK-RED 83.0

Outdoor model

Function

Power supply

Capacity

Dehumidification

Air flow(High)

Power outlet

Running current

Power input

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(High)

Fan speed(High)

Fan speed regulator

Refrigerant filling

capacity(R410A)

Refrigeration oil (Model)

Thermistor RT61(at 0:)

r/h

K/h

rpm

MUH-GA50VB

Single phase

230V, 50Hz

2,196

0.39

RN196VHSHT

1,300

C-R 1.80

C-S 3.00

RA6V50-PA

RA6V60-MA

850o605o290

828

1.80

520 (NEO22)

33.18

Cooling

5.0

2.5

7.93

1,720

7.54

2.81

Heating

5.2

—

7.23

1,550

6.84

3.23

MUH-GA60VB

Single phase

230V, 50Hz

2,760

0.58

NN29VBAHT

1,900

C-R 0.80

C-S 1.64

RA6V85-DA

WHT-BLK 68.8

BLK-RED 93.1

840o850o330

730

2.35

1,200 (NEO22)

33.18

Cooling

6.3

3.2

10.39

2,350

9.81

2.61

Heating

7.2

—

10.70

2,420

10.12

2.90

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

SPECIFICATION

NOTE: Test conditions are based on ISO5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C WB 15.5°C

Outdoor DB35°C WB(24°C) Outdoor DB 7°C WB 6°C

Indoor-Outdoor piping length : 5m

OB368B-1.qxp 07.5.21 8:06 PM Page 6

Outdoor model

Function

Power supply

Capacity

Dehumidification

Air flow(High/Low)

Power outlet

Running current

Power input

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(High/Low)

Fan speed(High/Low)

Fan speed regulator

Refrigerant filling

capacity(R410A)

Refrigeration oil (Model)

Thermistor RT61(at 0:)

Thermistor RT62(at 25:)

Thermistor RT63(at 0:)

R/h

K/h

rpm

MUH-GA80VB

Single phase

230V, 50Hz

0.57

NN37VAAHT

2,500

C-R 0.64

C-S 1.63

RA6V75-AD

WHT-BLK 62.8 BLK-YLW 55.9

YLW-RED 26.0

840o850o330

55/53

805/435

2.40

1,300 (NEO 22)

33.18

231.44

33.18

Cooling

8.5

4.6

2,940/1,470

14.42

3,191

13.85

2.61

Heating

9.4

—

2,940/1,470

15.19

3,361

14.62

2.74

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

NOTE: Test conditions are based on ISO5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C WB 15.5°C

Outdoor DB35°C WB(24°C) Outdoor DB 7°C WB 6°C

Indoor-Outdoor piping length : 5m

OB368B-1.qxp 07.5.21 8:06 PM Page 7

NOISE CRITERIA CURVES

10 63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

SPL(dB(A)) LINE

High

FAN SPEED

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10 63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

SPL(dB(A)) LINE

High

FAN SPEED

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

MUH-GA50VB MUH-GA60VB

10 63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

SPL(dB(A)) LINE

High

FAN SPEED

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

MUH-GA80VB

OUTDOOR UNIT

MICROPHONE

OB368B-1.qxp 07.5.21 8:06 PM Page 8

MUH-GA60VB MUH-GA80VB

OUTLINES AND DIMENSIONS

Unit: mm

MUH-GA50VB

100mm or more

350mm or more

500mmor more

REQUIRED SPACE

Drainage

3holes [33 Air out

Air in

Service panel

Liquid refrigerant

pipe joint

Refrigerant pipe

(flared) [6.35

Gas refrigerant

pipe joint

Refrigerant pipe

(flared) [12.7

35-

30-

100

161

157

850

500

183

20 292

605 248

350

290

310

345

355

Drainage

hole [16.2

30-

35-

155

198

515

299

330

360

850

430

500 80

121

840

Open as a rule

500mm or more if

the front and both

sides are open

100mm or more

200mm or more if

there are obstacles

to both sides

Open as a rule

500mm or more if the back,

both sides and top are open 350mm or more

100mm or more

Service panel

Gas refrigerant

pipe joint

Refrigerant pipe

(flared) [15.88

Liquid refrigerant

pipe joint

Refrigerant pipe

(flared) [6.35 (MUH-GA60VB)

[9.52 (MUH-GA80VB)

REQUIRED SPACE

OB368B-1.qxp 07.5.21 8:06 PM Page 9

WIRING DIAGRAM

MUH-GA60VB

DEICER

P.C. BOARD

BLU

X52

X52 NO

COM

TAB52

BLU 52C A2

T61

BLK

WHT

RED

BRN

TB2

CN730

BLK

WHT

CIRCUIT BREAKER CN721

352C 4

RED C2

ORN

DSAR

12V

WHT

BLK

SCR

RED

NR61 3

BLU

TB1

GRN/YLW

POWER SUPPLY

~ / N 230V 50Hz

CN661

RT61

X62 X62 1

321S4

BLU

BRN

BLU

BRN

SR61

F61

CN711

123

ORN

RED

COM

TO INDOOR UNIT CONNECTING

NOTES: 1.Use copper conductors only (For field wiring).

2.Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (3,N).

3.Symbols below indicate.

: Terminal block, : Connector

SYMBOL

DSAR

F61

NR61

RT61

SR61

TB1

TB2

T61

X52

X62

21S4

52C

NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE (3.15A)

COMPRESSOR (INNER PROTECTOR)

OUTDOOR FAN MOTOR (INNER PROTECTOR)

VARISTOR

DEFROST THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

TRANSFORMER

CONTACTOR

R. V. COIL RELAY

R. V. COIL

COMPRESSOR CONTACTOR

MUH-GA50VB

CN661

2CN721

21S4 MF

SR62

SR61

TAB20

GRN/YLW

BLU

CIRCUIT BREAKER

POWER SUPPLY BLU

BRN

DSAR

BLK

BRN

RED

DEICER P.C. BOARD

BLK

RED

WHT

CN730

RT61

BLK

RED

WHT

12V

CONNECTING

INDOOR UNIT TB2

TB1

~/N

NR61

F61

T61 C65

CN711

52C

230V 50Hz

1234

WHT

BLK

RED

ORN

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. : Connector

: Terminal block

NOTES:

SYMBOL

C65

DSAR

F61

NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE (2A)

COMPRESOR (INNER PROTECTOR)

SYMBOL

NR61

RT61

SR61,SR62

T61

NAME

OUTDOOR FAN MOTOR (INNER PROTECTOR)

VARISTOR

DEFROST THERMISTOR

SOLID STATE RELAY

TRANSFORMER

SYMBOL

TB1,TB2

21S4

52C

NAME

TERMINAL BLOCK

R.V. COIL

COMPRESSOR CONTACTOR

OB368B-1.qxp 07.5.21 8:06 PM Page 10

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