Mitsubishi MUH-GA50VB-E1, MUH-GA60VB-E1, MUH-GA80VB-E1 Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

HFC

utilized

R410A

OUTDOOR UNIT

SERVICE MANUAL

Wireless type Models

Revision:A

• RoHS PARTS LIST has been added. Please void OB368.

No. OB368

REVISED EDITION-A

MUH-GA50VB MUH-GA60VB MUH-GA80VB -

MUH-GA50VB

E1

Indoor unit service manual MSH-GA•VB Series (OB367)

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···········································45

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.

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 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

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 CO

2

Revision:A

• RoHS PARTS LIST has been added.

1

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)

TECHNICAL CHANGES

E1E1

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. 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 sufficient care not to allow water and other contaminations to enter the R410Arefrigerant during storage and

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

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

piping.)

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

composition change.

2

NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).

New Specification Current Specification

The incompatible refrigerating 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 refrigerating oil of the upper layer to flow back to the compressor.

Since refrigerant and refrigerating oil are compatible each, refrigerating oil backs to the compressor through the lower position oil back hole.

Compressor

Suction muffler

Oil back hole

Refrigerating oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigerating 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

(:)

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 R410A with a charging cylinder because the refrigerant bubbles due to high pressure and high-speed vaporization

No

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

The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])

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])

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.

3

R410A

Pipe diameter

mm

6.35

9.52

12.7

15.88

17 22 26 29

Dimension of flare nut

R22

17 22 24 27

2.Refrigerant piping

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)

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 (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.

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”.

3.Refrigerant 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.

4

2

Drainage hose

Piping

Air inlet

Air outlet

Drain outlet

(back and side)

Air outlet

(back and side)

1

2

Drain socket Drain cap {33 Drain cap {16

1 2

—

1 2 1

MUH-GA50VB

MUH-GA60VB MUH-GA80VB

PART NAMES AND FUNCTIONS

MUH-GA50VB

ACCESSORIES

MUH-GA60VB MUH-GA80VB

5

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) Refrigerating oil (Model) Thermistor RT61(at 0:)

kW

r/h

K /h

A

A W %

A

W

"

mm

kg

dB

rpm

kg cc

k"

MUH-GA50VB

Single phase

230V, 50Hz

2,196

15

37

0.39

RN196VHSHT

1,300 C-R 1.80 C-S 3.00

RA6V50-PA WHT-BLK 79.5 BLK-RED 83.0

850o605o290

47 52

828

1

1.80

520 (NEO22)

33.18

Cooling

5.0

2.5

7.93

1,720

94

7.54

2.81

Heating

5.2 —

7.23

1,550

93

6.84

3.23

MUH-GA60VB

Single phase

230V, 50Hz

2,760

25

74

0.58

NN29VBAHT

1,900 C-R 0.80 C-S 1.64

RA6V85-DA WHT-BLK 68.8 BLK-RED 93.1

840o850o330

74 53

730

1

2.35

1,200 (NEO22)

33.18

Cooling

6.3

3.2

10.39 2,350

98

9.81

2.61

Heating

7.2 —

10.70 2,420

98

10.12

2.90

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

3

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

6

Outdoor model

Function

Cooling

Power supply

Capacity Dehumidification

Capacity

Air flow(High/Low ) Power outlet Running current Power input Power factor

Electrical

data

Starting current Compressor motor current Fan motor current

Coefficient of performance(C.O.P)

kW

R/h

K /h

A

A W %

A

8.5

4.6

2,940/1,470

14.42 3,191

96

13.85

2.61

www

Model Output Winding

Compressor

resistance(at 20:)

W

"

Model Winding

Fan

motor

resistance(at 20:) Dimensions WOHOD Weight Sound level(High/Low ) Fan speed(High/Low )

"

mm

kg

w

dB

w

rpm

WHT-BLK 62.8 BLK-YLW 55.9

Fan speed regulator Refrigerant filling capacity(R410A)

Special

remarks

Refrigerating oil (Model) Thermistor RT61(at 0:) Thermistor RT62(at 25:) Thermistor RT63(at 0:)

kg cc

k" k" k"

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

w Reference value

MUH-GA80VB

Single phase

230V, 50Hz

25

90

0.57

NN37VAAHT

2,500 C-R 0.64 C-S 1.63

RA6V75-AD

YLW-RED 26.0

840o850o330

77

w

55/53

805/435

w

2

2.40

1,300 (NEO 22)

33.18

231.44

33.18

Heating

9.4 —

2,940/1,470

15.19 3,361

96

14.62

2.74

7

4

90

80

70

60

50

40

30

20

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

52

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

90

80

70

60

50

40

30

20

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

53

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

90

80

70

60

50

40

30

20

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

55

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

OUTDOORUNIT

MICROPHONE

1m

NOISE CRITERIA CURVES

MUH-GA50VB

MUH-GA60VB

MUH-GA80VB

8

5

100mm or more

1

0

0m

m

o

r m

ore

100mm or more

350mm or more

5

0

m

o

r m

o

re

REQUIRED SP ACE

Drainage 3holes [33

Air out

Air in

Service panel

Liquid refrigerant pipe joint

Refregerant pipe (flared) [6.35

Gas refregerant pipe joint

Refregerant pipe (flared) [12.7

35-

30

-

30

100

161

157

74

850

500

183

20

292

605

248

35

350

50

290

310

345

20

355

90

Drainage hole [16.2

30

-

35-

155

90

198

40

515

299

66

34

51

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 SP ACE

OUTLINES AND DIMENSIONS

MUH-GA50VB

Unit: mm

MUH-GA60VB MUH-GA80VB

9

6

DEICER P.C. BOARD

BLU

X52

NO

COM

TAB52

BLU

52C

A2

A1

T61

BLK

WHT

RED

BRN

TB2

7

1

CN730

BLK

WHT

CIRCUIT BREAKER

CN721

3

52C

4

RED

C2

ORN

DSAR

12V

WHT

C1

BLK

S

C

R

MC

RED

NR61

3

5

BLU

TB1

GRN/YLW

POWER SUPPLY

~ / N 230V 50Hz

CN661

RT61

X62

1 2 3

21S4

BLU

BRN

BLU

BRN

SR61

F61

CN711

MF

123

21

ORN

RED

34

NO

COM

TO INDOOR UNIT CONNECTING

N

3

N

L

PE

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

C1 C2

DSAR

F61 MC

MF 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 TERMINAL BLOCK TRANSFORMER CONTACTOR R. V. COIL RELAY R. V. COIL COMPRESSOR CONTACTOR

MC

CN661

3

1 2

CN721

21S4

MF

SR62

SR61

TAB20

GRN/YLW

BLU

CIRCUIT BREAKER

POWER SUPPLY

BLU

BRN

DSAR

BLK BRN

RED

DEICER P.C. BOARD

4

C1

BLK

RED

3

WHT

S

C

R

CN730

RT61

BLK

2 3

1

RED

WHT

12V

TO CONNECTING

INDOOR UNIT

TB2

3

N

TB1

L

N

PE

~/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

C1

C65

DSAR

F61

MC

NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE (2A) COMPRESOR (INNER PROTECTOR)

SYMBOL

MF 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

WIRING DIAGRAM

MUH-GA50VB

MUH-GA60VB

10

MUH-GA80VB

SYMBOL

CZ C1 C2

DSAR

F61

LEV

MC

NOTES:

RT61

RT62RT63

MF

LEV

YLW

BLK

WHT

ORN

RED

21

CIRCUIT BREAKER

TB1

L N

3

PE

GRN/YLW

TB2

~ / N 230V 50Hz

POWER SUPPLY

N

12V

TO INDOOR UNIT CONNECTING

NAME CZ SURGE ABSORBER COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(3.15A) EXPANSION VALVE COIL COMPRESSOR (INNER PROTECTOR)

BRN

DSAR

BRN

BLU

SYMBOL

MF NR61 RT61 RT62 RT63 SR61 SR62

CN662

CN661

X52X62

DEICER P.C. BOARD

BRN

BLU

1

2

52C

WHTWHT

CZ

OUTDOOR FAN MOTOR (INNER PROTECTOR) VARISTOR DEFROST THERMISTOR DISCHARGE TEMPERATURE THERMIST OR AMBIENT TEMPERA TURE THERMIST OR SOLID STATE RELAY SOLID STATE RELAY

6

CN724

SR62 SR61

T61

WHT

A1 A2BLU

52C

NAME NAME

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

YLW

BLK

123

NR61

3456

WHT

CN711

X62

COM

X52

COM

C1

RED

ORN

CN721

NO

TAB52

NO

CN730

F61

RED

S

BLK

SYMBOL

TB1 TB2

T61 X52 X62

21S4

52C

C2

1 2

21S4

3

7 5 3 1

C

MC

R

BLU

RED

BLU

TERMINAL BLOCK TERMINAL BLOCK TRANSFORMER CONTACTOR R.V. COIL RELAY R.V. COIL COMPRESSOR CONTACTOR

11

7

Muffler

REFRIGERANT SYSTEM DIAGRAM

MUH-GA50VB

Refrigerant pipe [12.7 (with heat insulator)

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Stop valve (with service port)

Stop valve

Strainer

4- way valve

Capillary tube

[3.0o[1.6o450

#100

Compressor

Check valve

Defrost thermistor RT61

Capillary tube

[3.0o[1.6o300

Unit:mm

Outdoor heat exchanger

Capillary tube

[3.0o[1.6o750

(2 pcs)

R.V. coil Heating ON Cooling OFF

MUH-GA60VB

Refrigerant pipe [15.88 (with heat insulator)

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Stop valve (with service port)

Muffler

Receiver

Stop valve

Strainer

4- way valve

Capillary tube

[3.0X[2.0X750

#100

Check valve

Muffler

#100

Compressor

Capillary tube [3.0X[2.0X750

Refrigerant flow in cooling Refrigerant flow in heating

Outdoor heat exchanger

Defrost thermistor RT61

R.V. coil Heating ON Cooling OFF

12

MUH-GA80VB

Outdoor heat exchanger

Flared connection

Defrost thermistor RT61

Discharge temperature thermistor RT62

Flared connection

Stop valve

Stop valve (with service port)

Capillary tube [3.6✕[2.4✕50

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe [15.88 (with heat insulator)

Refrigerant pipe [9.52 (with heat insulator)

LEV

R.V. coil heating ON cooling OFF

Muffler

#100

Strainer

#100

Receiver

Muffler

Ambient temperature thermistor RT63

Strainer

#100

Indoor unit

wMax. Height

difference: 10m(MSH-GA50/GA60VB)/ 15m(MSH-GA80VB)

A

Refrigerant Piping Max. Length

w Height difference should be within 10m(MSH-GA50VB/GA60VB)/ 15m(MSH-GA80VB) regardless of which unit, indoor or outdoor position is high.

Outdoor unit

Model

Piping size O.D : mm

Refrigerant piping

Max. length : m

A

25

30

Gas

12.7

15.88

Liquid

6.35

9.52

MUH-GA50VB

MUH-GA60VB MUH-GA80VB

Unit:mm

MAX. REFRIGERANT PIPING LENGTH

MAX. HEIGHT DIFFERENCE

13

Model

MUH-GA50VB

Refrigerant piping length (one way)

Outdoor unit precharged

1,800

15m

160

20m

260

25m

360

7m

0

10m

60

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model

MUH-GA60VB

Refrigerant piping length (one way)

Outdoor unit precharged

2,350

15m

160

20m

260

25m

360

7m

0

10m

60

Outdoor unit

precharged

2,400

0 165 440 715 990 1,265

Refrigerant piping length (one way)

15m10m7m

Model

MUH-GA80VB

20m

25m 30m

Calculation : Xg=20g/m ✕ (Refrigerant piping length (m)–7)

Calculation : Xg=55g/mo(Refrigerant piping length(m)-7)

14

8

11.6

10.5

7.5

8.5

9.5

12.8

15.6

9.8

12.6

11.2

14.1

17.2

17.4

13.9

12.4

10.8

15.6

19.2

MUH-GA50VB

MSH-GA60VB

MSH-GA50VB

MUH-GA60VB

MSH-GA80VB

MUH-GA80VB

Wet and dry-bulb thermometers

PERFORMANCE CURVES

MUH-GA50VB MUH-GA60VB MUH-GA80VB

The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions, since operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

198 ~ 264V, 50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °CWB (2) Indoor outlet air wet-bulb temperature : °CWB (3) Outdoor intake air dry-bulb temperature : °CDB (4) Total input: W (5) Indoor intake air dry-bulb temperature : °CDB (6) Outdoor intake air wet-bulb temperature : °CWB (7) Total input : W

Indoor air wet/dry-bulb temperature difference on the left side of the chart on this page and next page shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.

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 direct rays of the sun.

3. Check that the air filter is cleaned.

4. Open windows and doors of room.

5. Press the EMERGENCY OPERATION switch once(twice) to start the EMERGENCY COOL(HEAT) MODE.

6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7. 10 minutes later, measure temperature again and check that the temperature does not change.

INDOOR UNIT

Cooling

}

Heating

}

OUTDOOR UNIT

15

26.6

24.5

22.5

20.4

18.4

16.3

14.3

12.3

36.8

34.0

31.1

28.3

25.5

22.6

19.8

17.0

38.4

35.5

32.5

29.6

26.6

23.6

20.7

17.7

MUH-GA50VB

MSH-GA60VB

MSH-GA50VB

MUH-GA60VB

MSH-GA80VB

MUH-GA80VB

NOTE:The above curves are for the heating operation without any frost.

18

32

70(%)

230V

15 20

50

25 60

30 35

0.7

0.8

0.9

1.0

1.1

1.2

1.3

7

8

9

10

11

12

13

(:)

15 20

50

25 60

30 70(%)

35(:)

5

6

8

7

18 32

230V

18

32

70(%)

230V

15 20

50

25 60

30 35

0.6

0.7

0.8

0.9

1.0

1.1

(:)

6

7

8

9

10

11

10

11

8

9

230V

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

11

Both indoor and outdoor unit are under the same temperature/humidity condition.

Dry-bulb temperature

20 25

Relative humidity(%)

50 60

30 70

22

Air flow should be set at MAX.

33

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])

(kgf/F[Gauge])(MPa[Gauge])

Outdoor low pressure

Ambient temperature(˚C) Ambient humidity(%)

MUH-GA50VB

Outdoor unit current (A)

MUH-GA50VB

Ambient temperature(˚C) Ambient humidity(%)

(kgf/F[Gauge])(MPa[Gauge])

Outdoor low pressure

MUH-GA60VB

Ambient temperature(˚C) Ambient humidity(%)

MUH-GA60VB

Outdoor unit current (A)

Ambient temperature(˚C) Ambient humidity(%)

16