Mitsubishi Electric MUZ-GA50VA-E1, MUZ-GA60VA-E1, MUZ-GA60VA-E2, MUZ-GA60VA-E3, MUZ-GA71VA-E1 Service Manual

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ···································3

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 ············· 12

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

9. ACTUATOR CONTROL ··································· 26

10. SERVICE FUNCTIONS ···································· 27

11. TROUBLESHOOTING ····································· 27

12. DISASSEMBLY INSTRUCTIONS ···················· 46

13. PARTS LIST ····················································· 50

14. RoHS PARTS LIST ·········································· 52

Models

SPLIT-TYPE AIR CONDITIONERS

MUZ-GA50VA -

E1

MUZ-GA60VA -

E1

MUZ-GA60VA -

E2

MUZ-GA60VA -

E3

MUZ-GA71VA -

E1

MUZ-GA71VA -

E2

HFC

utilized

R410A

NOTE:

• RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the RoHS Parts List.

• Contents of SERVICE FUNCTIONS (10) have been removed.

No. OB389

REVISED EDITION-H

Indoor unit service manual
MSZ-GA•VA Series (OB388)

Please void OB389 REVISED EDITION-G.

OUTDOOR UNIT

Revision H:

• Errors in TROUBLESHOOTING have

been corrected.

2

Revision A :

• RoHS PARTS LIST has been added.

• Failure mode recall function (11-2.) has been changed.

• Check of HPS (11-6.

) has been corrected.

Revision B:

• Compressor has been changed. (MUZ-GA50/60VA)

Previous
New

Model
SNB130FLDH
SNB130FLDH1

PARTS LIST number
E02 851 900
E02 939 900

RoHS PARTS LIST number
E12 851 900
E12 939 900

Revision C:

• MUZ-GA60/71VA-

E2

have been added.

• Check of outdoor thermistors (11-6. ) has been corrected.

• Contents of SERVICE FUNCTIONS (10) have been removed as these models do not have the functions.

Revision D:

• PARTS LIST and RoHS PARTS LIST have been changed.

Revision E:

• REFRIGERANT SYSTEM DIAGRAM has been changed for MUZ-GA60VA-E2.

Revision F:

• MUZ-GA60VA-E3 has been added.

Revision G:

• The fan guard for MUZ-GA50VA-E, MUZ-GA60VA-E and MUZ-GA71VA-E has been changed.

Use the specifi ed refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.

Revision H:

• Errors in TROUBLESHOOTING have been corrected.

3

1

TECHNICAL CHANGES

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

Gas phase

Possible

Compatible oil

Light yellow

Non

Refrigerant

Composition (Ratio)

Refrigerant handling

Chlorine

Safety group (ASHRAE)

Molecular weight

Boiling point (°C)

Steam pressure [25°C](Mpa)

Saturated steam density [25°C](kg/m

3

)

Combustibility

ODP 1

GWP 2

Refrigerant charge method

Additional charge on leakage

Kind

Color

Smell

1: Ozone Depletion Potential : based on CFC-11
2: Grobal Warming Potential : based on CO

2

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 air
conditioners.

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.

Take 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.

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

piping.)

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

composition change.

MUZ-A18YV -E1 MUZ-GA50VA -

E1

MUZ-A24YV -E1 MUZ-GA60VA -

E1

MUZ-A26YV -E1 MUZ-GA71VA -

E1

1. Indication of capacity has been changed. (BTU base kW base)

2. Outdoor electronic control P.C. board has been changed.

3. Noise filter P.C. board has been changed.

4. Length of fan motor lead wire has been changed.

5. Shape of relay panel has been changed.

6. Signal of terminal block has been changed.

MUZ-GA60VA -E1 MUZ-GA60VA -

E2

1. Compressor has been changed. (SNB130FLDH1 SNB130FLEH1)

2. Outdoor electronic control P.C. board has been changed.

MUZ-GA71VA -E1 MUZ-GA71VA -

E2

1. Outdoor electronic control P.C. board has been changed.

MUZ-GA60VA -E2 MUZ-GA60VA -

E3

1. Compressor has been changed. (SNB130FLEH1 SNB130FGBH)

2. Outdoor electronic control P.C. board has been changed.

3. Refrigerant circuit has been changed.

4

-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/cm2 [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 R410A with a charging cylinder because the

refrigerant bubbles due to high pressure and high-speed vaporization.

No

No

No

Yes

Yes

New

New

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 15.88mm

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.

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/cm

2

[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,
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

55

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)

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

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. 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, capacity 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.

2. Refrigerant piping

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.

Wall
thickness

Outside diameter

Pipe

mm

For liquid

For gas

6.35

9.52

12.7

15.88

0.8 mm

0.8 mm

0.8 mm

1.0 mm

Heat resisting foam plastic

Specific gravity 0.045 Thickness 8 mm

Insulation material

6

PART NAMES AND FUNCTIONS

2

Air inlet

Piping

Air outlet

(back and side)

Drain hose

Drain outlet

ACCESSORIES

Drain socket

Drain cap Ø33

1

2

E1

E2

E3

Single phase

230V,50Hz

20

7.46

0.30

SNB130FLDH or SNB130FLDH1

850

U-V 0.45 W-U 0.45

V-W 0.4 5

RC0J60-AA

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840x850x330

53

2

1.8

NEO22

Cooling

5.0(0.9-5.9)

2.5

2,940/1,650

6.23

1,410

98.4

5.93

3.42

53/51

800/480

Heating

5.9(0.9-7.8)
—

2,940/2,210

7.01

1,580

98.0

6.71

3.62

55/53

800/620

Outdoor model

Function

Power supply

Capacity Rated frequency (Min.-Max.)
Dehumidification
Air flow (High/Low)
Breaker capacity
Running current
Power input
Power factor
Starting current 1
Compressor motor current 1
Fan motor current

Model

Output
Winding
resistance(at 20°C)
Model
Winding
resistance (at 20°C)
Dimensions WxHxD
Weight
Sound level (High/Low)
Fan speed (High/Low)
Fan speed regulator
Refrigerant filling
capacity (R410A)
Refrigeration oil (Model)

kW

/h

m

3

/h
A
A

W
%

A
A
A

W

Ω

Ω

mm

kg
dB

rpm

kg

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P) 1

Capacity

Electrical

data

Single phase

230V,50Hz

20

11. 2

0.30

TNB220FMCH

1,300

U-V 1.41 W-U 1.41

V-W 1.4 1

RC0J60-AA

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840x850x330

58

2

2.0

NEO22

Heating

8.1(0.9-9.6)
—

2,940/2,210

10.6

2,390

98.0

10.3

3.31

55/53

800/620

MUZ-GA71VA

Single phase

230V,50Hz

20

8.93

0.30

SNB130FLDH or SNB130FLDH1

SNB130FLEH1

SNB130FGBH

850

U-V 0.45 W-U 0.45

V-W 0.4 5

RC0J60-AA

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840x850x330

53

2

1.8

NEO22

Cooling

6.0(0.9-6.7)

3.0

2,940/1,650

8.23

1,870

98.8

7.93

3.11

53/51

800/480

Heating

6.8(0.9-8.1)
—

2,940/2,210

8.33

1,880

98.1

8.03

3.51

55/53

800/620

MUZ-GA60VA

MUZ-GA50VA

Cooling

7.1(0.9-8.3)

3.8

2,940/1,650

10.4

2,360

98.7

10.1

2.93

53/51

800/480

NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor Dry bulb temperature 27

Wet bulb temperature 19

Outdoor Dry bulb temperature 35 Wet bulb temperature (24

)
Heating: Indoor Dry bulb temperature 20 Wet bulb temperature 15
Outdoor Dry bulb temperature 7 Wet bulb temperature 6
Refrigerant piping length (one way): 5m
1 Measured under rated operating frequency.

3

SPECIFICATION

MUZ-GA50VA
MUZ-GA60VA
MUZ-GA71VA

7

NOISE CRITERIA CURVES

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

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

MUZ-GA50VA
MUZ-GA60VA
MUZ-GA71VA

OUTDOOR UNIT

MICROPHONE

1m

COOLING

FUNCTION

SPL(dB(A)) LINE

High

FAN SPEED

HEATING

53

55

Test conditions
Cooling: Dry-bulb temperature 35°C

Wet-bulb temperature (24°C)
Heating: Dry-bulb temperature 7°C
Wet-bulb temperature 6°C

Model

Item

Smoothing capacitor

Current transformer

Current transformer

Fuse

Fuse

Fuse

Intelligent power module

High pressure switch

Intelligent power module

Reactor

Expansion valve coil

Power factor controller

Resistor

Resistor

Resistor

Solenoid coil relay

Terminal block

Terminal block

Relay

R.V. coil

MUZ-GA50VA

(CB1,2,3)

(CT1,2)

(CT61)

(F64)

(F801)

(F911)

(HC930)

(HPS)

(IPM)

(L)

(LEV)

(PFC)

(R64A,B)

(R937A,B)

(RS1~4)

(SSR61)

(TB1)

(TB2)

(X64)

(21S4)

MUZ-GA60VA MUZ-GA71VA

560μF 450V

ETQ19Z68AY

ETQ19Z53AY

250V 2A

250V 3.15A

250V 1A

PS21661-RZ

ACB-DB156 (for )

PS21244-A

340μH 20A

DC 12 V

PS51259-A

10Ω 10W

1.1Ω 2W 2%

0.04Ω 7W

TLP3506

3P

3P

G4A

AC 220 ~ 240 V

ACB-DB156

–

E3

Specifications and rated conditions of main electric parts

8

5

OUTLINES AND DIMENSIONS

Unit: mm

MUZ-GA50VA
MUZ-GA60VA
MUZ-GA71VA

30°

35°

155

90

198

40

515

299

66

34

51

330

360

850

430

500

80

121

840

Open as a rule
500 mm or more if
the front and both
sides are open

100 mm or more
200 mm or more if
there are obstacles
to both sides

Open as a rule
500 mm or more if the back,
both sides and top are open

350 mm or more

100 mm or more

Service panel

Gas refrigerant
pipe joint
Refrigerant pipe
(flared) Ø12.7 (MUZ-GA50)
Ø15.88 (MUZ-GA60/71)

Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) Ø6.35 (MUZ-GA50/60)
Ø9.52 (MUZ-GA71)

REQUIRED SPACE

9

WIRING DIAGRAM

6

R64B

YLW

230V~

12-24V

CN912

CN663

WHT

BLU

NOISE

FILTER

P.C.BOARD

BRN

TO INDOOR

UNIT

CONNECTING

RED

S3

RT65

21

CN61

13

GRN/YLW

5

PFC

GRN

LD9

POWER

BOARD

RT64

21

CN3

RED

WHT

RS2

RS1

R64A

RS3

RS4

F801

CN901

NR64

ELECTRONIC

CONTROL

P.C.BOARD

CB1

CB2

CB3

HC930

IPM

NF

BLK

BLK

BLK

BLK

WHT

RED

YLW

BLU

ORN

PNK

GRY

BLU

WHT

GRN

GRN

BLU
BLU

BLK

BLK

BLK

BLK

BLK

BLK

BLK

BLK

BLK
BLK

BLK

RED

BLU

L

CT2

CT1

SSR61

U

6

CN7954123 78

CN661

W

CN4

TB2

S1

1

CN601

3

S2

1 567

CN702

5321

CN781

13

CN701

12

12

CN931

LD1LD2

T801

R937A

R937B

CN801

231 34512

MF

CN932

3X64

5123

LDE2

12

CT61

TAB1

F64

F911

LDE1

21S4

POWER SUPPLY

~/N 230V 50Hz

TAB2

N

PE

L

TB1

CIRCUIT

BREAKER

4

1

RED

YLW

3

2

RED

S

R

21

CN903

21

CN902

21

CN5

6543 1

CN2

27

TAB4

V

MC

W

U

V

WHT

RT61 RT62 RT68

LEV

:Terminal block :Connector

3.Symbols below indicate.

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

diagram for servicing.

refer to the indoor unit electric wiring

1.About the indoor side electric wiringNOTES:

SYMBOL

NAME

SYMBOL

NAME

CURRENT TRANSFORMER

FUSE (T1AL 250V)

LEV

EXPANSION VALVE COIL

L

REACTOR

IPM

INTELLIGENT POWER MODULE

CT61

FUSE (T2AL 250V)

F64

CT1, 2

CURRENT TRANSFORMER

HC930

INTELLIGENT POWER MODULE

F911

F801

FUSE (T3.15AL 250V)

SMOOTHING CAPACITOR

CB1~3

OUTDOOR FAN MOTOR

POWER FACTOR CONTROLLER

NOISE FILTER

RT61

DISCHARGE TEMPERATURE THERMISTOR

RS1~4

RESISTOR

R937A, B

RESISTOR

MF

MC

COMPRESSOR

R64A,B

RESISTOR

PFC

NF

NR64

VAR ISTOR

AMBIENT TEMPERATURE THERMISTOR

SOLENOID COIL RELAY

21S4

R.V. COIL

X64

RELAY

TB1

TERMINAL BLOCK

TB2

TERMINAL BLOCK

RT65

FIN TEMPERATURE THERMISTOR

RT64

T801

TRANSFORMER

SSR61

RT68

OUTDOOR HEAT EXCHANGER

TEMPERATURE THERMISTOR

DEFROST THERMISTOR

RT62

NAME

SYMBOL

MUZ-GA50VA
MUZ-GA60VA -

E1

MUZ-GA60VA -

E2

10

MUZ-GA60VA -

E3

11

MUZ-GA71VA

BLK

CN902

12

CN903

12

TAB4

X64 3

R64A R64B

RED

2

3

1

4

L

YLW

YLW

RED

230V~

12-24V

CN912

CN663

WHT

BLU

NOISE

FILTER

P.C.BOARD

BRN

TO INDOOR

UNIT

CONNECTING

RED

S3

RT65

21

CN61

13

GRN/YLW

5

PFC

GRN

LD9

POWER

BOARD

RT64

21

CN3

HPS

RED

RED

RED

WHT

RS2

RS1 RS3

RS4

F801

CN901

NR64

CN681

ELECTRONIC

CONTROL

P.C.BOARD

CB1

CB2

CB3

HC930

IPM

NF

BLK

BLK

BLK

BLK

WHT

RED

YLW

BLU

ORN

PNK

GRY

BLU

WHT

GRN

GRN

BLU
BLU

BLK

BLK

BLK

BLK

BLK

BLK

BLK

BLK
BLK

BLK

RED

BLU

CT2

CT1

SSR61

U

6

CN7954123 78

CN661

12

W

CN4

TB2

S1

1

CN601

3

S2

1567

CN702

5321

CN781

13

CN701

12

12

CN931

LD1LD2

T801

R937A

R937B

CN801

23134512

MF

CN932

5123

LDE2

12

CT61

TAB1

F64

F911

LDE1

21S4

POWER SUPPLY

~/N 230V 50Hz

TAB2

N

PE

L

TB1

CIRCUIT

BREAKER

S

R

21

CN5

6543 1

CN2

27

V

MC

W

U

V

WHT

RT61 RT62 RT68

LEV

:Terminal block :Connector

3.Symbols below indicate.

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

diagram for servicing.

refer to the indoor unit electric wiring

1.About the indoor side electric wiringNOTES:

SYMBOL

NAME

SYMBOL

NAME

CURRENT TRANSFORMER

FUSE (T1AL 250V)

LEV

EXPANSION VALVE COIL

L

REACTOR

IPM

INTELLIGENT POWER MODULE

HPS

HIGH PRESSURE SWITCH

CT61

CT1, 2

CURRENT TRANSFORMER

HC930

INTELLIGENT POWER MODULE

F911

F801

FUSE (T3.15AL 250V)

F64

FUSE (T2AL 250V)

SMOOTHING CAPACITORCB1~3

OUTDOOR FAN MOTOR

POWER FACTOR CONTROLLER

NOISE FILTER

RT61

DISCHARGE TEMPERATURE THERMISTOR

RS1~4

RESISTOR

R937A, B

RESISTOR

MF

MC

COMPRESSOR

R64A,B RESISTOR

PFC

NF

NR64

VAR ISTOR

FIN TEMPERATURE THERMISTOR

SOLENOID COIL RELAY

21S4

R.V. COIL

X64

RELAY

TB1

TERMINAL BLOCK

TB2

TERMINAL BLOCK

RT64

T801

TRANSFORMER

SSR61

AMBIENT TEMPERATURE THERMISTOR

RT65

RT68

OUTDOOR HEAT EXCHANGER

TEMPERATURE THERMISTOR

DEFROST THERMISTOR

RT62

NAME

SYMBOL

12

REFRIGERANT SYSTEM DIAGRAM

7

MUZ-GA50VA
MUZ-GA60VA -

E1

Unit: mm

Outdoor
heat
exchanger

Flared connection

Defrost
thermistor
RT61

Discharge
temperature
thermistor
RT62

Flared connection

Stop valve

Stop valve
(with service port)

Capillary tube
Ø3.6 x Ø2.4 x 50

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe Ø12.7 (MUZ-GA50VA)
(with heat insulator) Ø15.88 (MUZ-GA60VA)

Refrigerant pipe Ø6.35
(with heat insulator)

LEV

R.V. coil
heating ON
cooling OFF

Muffler

#100

Strainer

#100

Receiver

Outdoor heat
exchanger
temperature
thermistor
RT68

Ambient
temperature
thermistor
RT65

Strainer

#100

MUZ-GA60VA -

E2

Unit: mm

Outdoor
heat
exchanger

Flared connection

Defrost
thermistor

RT61
Discharge
temperature
thermistor
RT62

Flared connection

Stop valve

Stop valve
(with service port)

Capillary tube
Ø3.6 x Ø2.4 x 50

Capillary tube
Ø1.8 x Ø0.6 x 1000

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe Ø6.35
(with heat insulator)

LEV

R.V. coil
heating ON
cooling OFF

Oil separator

Strainer

#100

Receiver

Outdoor
heat
exchanger
temperature
thermistor
RT68

Strainer

#100

Strainer

#100

Ambient
temperature
thermistor
RT65

Refrigerant pipe Ø15.88
(with heat insulator)

13

MUZ-GA71VA

Unit: mm

Outdoor
heat
exchanger

Flared connection

Defrost
thermistor
RT61

Discharge
temperature
thermistor
RT62

Flared connection

Stop valve

Stop valve
(with service port)

Capillary tube
Ø3.6 x Ø2.4 x 50

Capillary tube
Ø1.8 x Ø0.6 x 1000

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe Ø15.88
(with heat insulator)

Refrigerant pipe Ø9.52
(with heat insulator)

LEV

R.V. coil
heating ON
cooling OFF

Oil separator

High-pressure
switch

Strainer

#100

Receiver

Outdoor
heat
exchanger
temperature
thermistor
RT68

Strainer

#100

Strainer

#100

Ambient
temperature
thermistor
RT65

MUZ-GA60VA -

E3

Unit: mm

Outdoor
heat
exchanger

Flared connection

Defrost
thermistor
RT61

Discharge
temperature
thermistor
RT62

Flared connection

Stop valve

Stop valve
(with service port)

Capillary tube
Ø3.6 x Ø2.4 x 50

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe Ø15.88
(with heat insulator)

Refrigerant pipe Ø6.35
(with heat insulator)

LEV

R.V. coil
heating ON
cooling OFF

Muffler

#100

Strainer

#100

Receiver

Outdoor heat
exchanger
temperature
thermistor
RT68

Ambient
temperature
thermistor
RT65

Strainer

#100

High-pressure
switch

14

Refrigerant Piping
Max. length
A

Max. Height
difference
B

Indoor
unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Refrigerant piping : m

Max. length

A

Max. Height

difference

B

1530

Gas

12.7

15.88

Liquid

6.35

9.52

MUZ-GA50VA

MUZ-GA60VA

MUZ-GA71VA

Model

Piping size O.D : mm

Model

MUZ-GA50VA
MUZ-GA60VA

Refrigerant piping length (one way)

Outdoor unit

precharged

1,800

15m

160

20m

260

25m

360

30m

460

7m

0

10m

60

ADDITIONAL REFRIGERANT CHARGE (R410A: g)

Calculation: Xg = 20 g/m x (Refrigerant piping length (m) -7)

Outdoor unit

precharged

2,000

0 165 440 715 990 1,265

Refrigerant piping length (one way)

15m10m7m

Model

MUZ-GA71VA

20m

25m 30m

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

NOTE: Refrigerant piping exceeding 7m requires additional refrigerant charge according to the calculation.

15

PERFORMANCE CURVES8

The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi-

tions 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 ~ 264 V, 50 Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

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

Indoor air wet and 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 and dry bulb temperature and the indoor outlet air wet and dry bulb temperature
for your reference at service.

}

}

Cooling

Heating

How to measure the indoor air wet and 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

OUTDOOR UNIT

Wet and dry bulb
thermometers

Wet and dry bulb
thermometers

MUZ-GA50VA
MUZ-GA60VA
MUZ-GA71VA

Indoor air Wet-bulb temperature

difference (degree)

MUZ-GA50VA

8.7

8.0

7.3

6.6

5.9

5.3

at Rated frequency

MUZ-GA71VA

at Rated frequency

Outdoor intake air Dry-bulb temperature (°C)

Outdoor intake air Dry-bulb temperature (°C)

10.7

9.8

8.9

8.0

7.2

6.4

8.7

8.0

7.3

6.6

5.9

5.3

MUZ-GA60VA

at Rated frequency

Indoor intake air Wet-bulb temperature (°C)

Indoo

r intake air Wet-bulb temperature (°C)

8-1. CAPACITY AND INPUT CURVES

16

MUZ-GA71VA

Capacity correction factors

Input correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

24.1

22.3

20.4

18.5

16.7

14.8

13.0

11.1

23.4

21.6

19.8

18.0

16.2

14.4

12.6

10.8

Indoor air Dry-bulb temperature

difference (degree)

Indoor intake air Dry-

bulb temperature (°C)

Outdoor intake air Wet-bulb temperature (°C)

Outdoor intake air Wet-bulb temperature (°C)

Indoor intake air Dry-bulb temperature (°

C)

MUZ-GA50VA

at Rated frequency

MUZ-GA60VA

at Rated frequency

MUZ-GA71VA

at Rated frequency

27.9

25.7

23.6

21.4

19.3

17.2

15.0

12.9

Capacity correction factors

Input correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

Capacity correction factors

Input correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

MUZ-GA50VA

MUZ-GA60VA

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

0 50 100 150

0.5

1.0

1.5

(Hz)

8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR

NOTE: The above broken lines are for the heating operation without any
frost and defrost operation.

17

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/cm2 [Gauge])

(MPa [Gauge])

(kgf/cm

2

[Gauge])

18 32

15 2050256030

70 (%)

35(°C)

0.3

0.4

0.5

0.6

0.7

0.8

3

4

5

6

7

8

9

0.9

Ambient temperature(°C) Ambient humidity(%)

Outdoor low pressure

15 2050256030

70 (%)

35(°C)

4

5

6

7

8

32

18

Outdoor unit current(A)

Ambient temperature(°C) Ambient humidity(%)

MUZ-GA50VA

MUZ-GA50VA

0.3

0.4

0.5

0.6

0.7

0.8

3

4

5

6

7

8

9

0.9

MUZ-GA71VA

15 205025

60

30
70 (%)

35(°C)

5

7

9

11

13

32

18

Outdoor unit current(A)

Ambient temperature(°C) Ambient humidity(%)

MUZ-GA71VA

(MPa [Gauge])

(kgf/cm

2

[Gauge])

18 32

15 2050256030

70 (%)

35(°C)

Ambient temperature(°C) Ambient humidity(%)

Outdoor low pressure

0.3

0.4

0.5

0.6

0.7

0.8

3

4

5

6

7

8

9

0.9

(MPa [Gauge])

(kgf/cm

2

[Gauge])

18 32

15 2050256030

70 (%)

35(°C)

15 205025

60

30
70 (%)

35(°C)

5

6

7

8

9

32

18

Ambient temperature(°C) Ambient humidity(%)

Outdoor low pressure

Outdoor unit current(A)

Ambient temperature(°C) Ambient humidity(%)

MUZ-GA60VA

MUZ-GA60VA

1. Press EMERGENCY OPERATION switch to COOL or HEAT mode (COOL: Press once, HEAT: Press twice).

2. Test run operation starts and continues to operate for 30 minutes.

3. Compressor operates at rated frequency in COOL mode or 58Hz in HEAT mode.

4. Indoor fan operates at High speed.

5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor
varies).

6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on
remote controller.

8-3. TEST RUN OPERATION (How to operate fixed-frequency operation)

COOL operation

Both indoor and outdoor unit are under the

same temperature/humidity condition.

Operation: TEST RUN OPERATION (refer to 8-3.)

Dry-bulb temperature( )

Relative humidity(%)

20

50

25

60

30

70

8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT