Mitsubishi Electric MUZ-GA50VA Manuale utente

SERVICE MANUAL

CONTENTS

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

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

3. SPECIFICATION·················································5

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

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

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

7. REFRIGERANT SYSTEM DIAGRAM··············11

8. PERFORMANCE CURVES······························13

9. ACTUATOR CONTROL····································24

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

11. DISASSEMBLY INSTRUCTIONS·····················44

12. PARTS LIST······················································48

Wireless type

Models

SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA - E1

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA - E1

Indication of

model name

HFC

utilized

R410A

No. OB389

NOTE:

This service manual describes technical data of the outdoor units.

•As for indoor units MSZ-GA50VA - , MSZ-GA60VA - and MSZ-GA71VA - , refer to

the service manual OB388. E1E1E1

OB389 --1qxp 05.1.26 18:14 Page 1

1TECHNICAL 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

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 air

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 refrigeration 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

Refrigerating oil /Refrigerant

Compressor

MUZ-A18YV - ➔MUZ-GA50VA -

MUZ-A24YV - ➔MUZ-GA60VA -

MUZ-A26YV - ➔MUZ-GA71VA - E1E1

E1E1

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 been changed.

5.Shape of relay panel has been changed.

6.Signal of terminal block has been changed.

OB389 --1qxp 05.1.26 18:14 Page 2

-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 15.88mm

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.

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

OB389 --1qxp 05.1.26 18:14 Page 3

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

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.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 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.

OB389 --1qxp 05.1.26 18:14 Page 4

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

Air inlet

Piping

Air outlet

(back and side)

Drain hose

Drain outlet

ACCESSORIES

Drain socket

Drain cap [33 1

MUZ-GA50VA - E1

MUZ-GA60VA - E1

MUZ-GA71VA - E1

Single phase

230V,50Hz

7.46

0.30

SNB130FLDH

850

U-V 0.45 W-U 0.45

V-W 0.45

RC0J60-AA

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840o850o330

1.8

450 (NEO22)

13.4

10.0

17.0

10.0

Cooling

5.0(0.9-5.9)

2.5

2,940/1,650W

6.23

1,410

98.4

5.93

3.42

53/51W

800/480W

Heating

5.9(0.9-7.8)

—

2,940/2,210W

7.01

1,580

98.0

6.71

3.62

55/53W

800/620W

Outdoor model

Function

Power supply

Capacity Rated frequency(Min.-Max.)

Dehumidification

Air flow(High/LowW)

Power outlet

Running current

Power input

Power factor

Starting current ✽1

Compressor motor current ✽1

Fan motor current

Model

Output

Winding

resistance(at 20:)

Model

Winding

resistance(at 20:)

Dimensions WOHOD

Weight

Sound level(High/LowW)

Fan speed(High/LowW)

Fan speed regulator

Refrigerant filling

capacity(R410A)

Refrigeration oil(Model)

Thermistor RT62(at 100:)

Thermistor RT61(at 25:)

Thermistor RT64(at 50:)

Thermistor RT65(at 25:)

Thermistor RT68(at 25:)

r/h

K/h

rpm

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P) ✽1

Capacity

Electrical

data

Single phase

230V,50Hz

11.2

0.30

TNB220FMCH

1,300

U-V 1.41 W-U 1.41

V-W 1.41

RC0J60-AA

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840o850o330

2.0

870 (NEO22)

13.4

10.0

17.0

10.0

Cooling

7.1(0.9-8.3)

3.8

2,940/1,650W

10.4

2,360

98.7

10.1

2.93

53/51W

800/480W

Heating

8.1(0.9-9.6)

—

2,940/2,210W

10.6

2,390

98.0

10.3

3.31

55/53W

800/620W

MUZ-GA71VA - E1

Single phase

230V,50Hz

8.93

0.30

SNB130FLDH

850

U-V 0.45 W-U 0.45

V-W 0.45

RC0J60-AA

BLK-WHT 15.2

WHT-RED 15.2 RED-BLK15.2

840o850o330

1.8

450 (NEO22)

13.4

10.0

17.0

10.0

Cooling

6.0(0.9-6.7)

3.0

2,940/1,650W

8.23

1,870

98.8

7.93

3.11

53/51W

800/480W

Heating

6.8(0.9-8.1)

—

2,940/2,210W

8.33

1,880

98.1

8.03

3.51

55/53W

800/620W

MUZ-GA60VA - E1

MUZ-GA50VA - E1

NOTE : Test conditions are based on ISO 5151.

Cooling : Indoor DB 27:WB 19:

Outdoor DB 35:WB (24:)

Heating : Indoor DB 20:WB 15:

Outdoor DB 7:WB 6:

Refrigerant piping length (one way): 5m

✽1 Measured under rated operating frequency.

wReference value

3SPECIFICATION

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA - E1

OB389 --1qxp 05.1.26 18:14 Page 5

OUTDOOR UNIT

Model

Item

Smoothing capacitor

Current transformer

Fuse

Intelligent power module

High pressure switch

Intelligent power module

Reactor

Expansion valve coil

Power factor controller

Resistor

Solenoid coil relay

Terminal block

Relay

R.V. coil

MUZ-GA50VA - E1

(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 - E1 MUZ-GA71VA - E1

560+450V

ETQ19Z68AY

ETQ19Z53AY

250V 2A

250V 3.15A

250V 1A

PS21661-RZ

PS21244-A

340µH 20A

CAM-MD12ME

PS51259-A

10"10W

1.1"2W 2%

0.04"7W

TLP3506

G4A

LD30013

ACB-DB156

–

Specifications and rating conditions of main electric parts

OB389 --1qxp 05.1.26 18:14 Page 6

NOISE CRITERIA CURVES

COOLING

FUNCTION SPL(dB(A)) LINE

High

FAN SPEED

HEATING

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

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

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA - E1

OUTDOOR UNIT

MICROPHONE

OB389 --1qxp 05.1.26 18:14 Page 7

5OUTLINES AND DIMENSIONS

Unit: mm

OUTDOOR UNIT

MUZ-GA50VA -

MUZ-GA60VA -

MUZ-GA71VA - E1

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) [12.7 (MUZ-GA50VA)

[15.88 (MUZ-GA60/GA71VA)

Liquid refrigerant

pipe joint

Refrigerant pipe

(flared) [6.35 (MUZ-GA50/GA60VA)

[9.52 (MUZ-GA71VA)

REQUIRED SPACE

OB389 --1qxp 05.1.26 18:14 Page 8

WIRING DIAGRAM

MUZ-GA50VA -

MUZ-GA60VA -E1

R64B

YLW

230V~

12-24V

CN912

CN663

WHT

BLU

NOISE

FILTER

P.C.BOARD

BRN

TO INDOOR

UNIT

CONNECTING

RED

RT65

CN61

GRN/YLW

PFC

GRN

LD9

POWER

BOARD

RT64

CN3

RED

WHT

RS2

RS1

R64A

RS3

RS4

F801

CN901

NR64

ELECTRONIC

CONTROL

P.C.BOARD

CB1

CB2

CB3

HC930

IPM

BLK

WHT

RED

YLW

BLU

ORN

PNK

GRY

BLU

WHT

GRN

BLU

BLK

RED

BLU

CT2

CT1

SSR61

CN79541 2 3 7 8

CN661

CN4

TB2

CN601

1 5 6 7

CN702

5321 CN781 1 3

CN701

1 2

CN931

LD1LD2

T801 R937A

R937B

CN801

2 31 3 4 51 2

CN932

3X64

51 2 3

LDE2

1 2

CT61

TAB1

F64

F911

LDE1

21S4

POWER SUPPLY

~/N 230V 50Hz

TAB2

TB1

CIRCUIT

BREAKER

RED

YLW

RED

2 1

CN903

2 1

CN902

2 1

CN5

6 5 4 3 1

CN2 27

TAB4 V

WHT

RT61 RT62 RT68 LEV

MODELS WIRING DIAGRAM

OUTDOOR UNIT

: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

LREACTOR

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

MC COMPRESSOR

R64A,B RESISTOR

PFC

NR64 VARISTOR

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

OB389 --1qxp 05.1.26 18:14 Page 9

MUZ-GA71VA -E1

BLK

CN902

12 CN903

TAB4

X64 3

R64A R64B RED

YLW

RED

230V~

12-24V

CN912

CN663

WHT

BLU

NOISE

FILTER

P.C.BOARD

BRN

TO INDOOR

UNIT

CONNECTING

RED

RT65

CN61

GRN/YLW

PFC

GRN

LD9

POWER

BOARD

RT64

CN3

HPS

RED

WHT

RS2

RS1 RS3

RS4

F801

CN901

NR64

CN681

ELECTRONIC

CONTROL

P.C.BOARD

CB1

CB2

CB3

HC930

IPM

BLK

WHT

RED

YLW

BLU

ORN

PNK

GRY

BLU

WHT

GRN

BLU

BLK

RED

BLU

CT2

CT1

SSR61

CN79541 2 3 7 8

CN661

1 2

CN4

TB2

CN601

1 5 6 7

CN702

5321 CN781 1 3

CN701

1 2

CN931

LD1LD2

T801 R937A

R937B

CN801

2 31 3 4 51 2

CN932

51 2 3

LDE2

1 2

CT61

TAB1

F64

F911

LDE1

21S4

POWER SUPPLY

~/N 230V 50Hz

TAB2

TB1

CIRCUIT

BREAKER

2 1

CN5

6 5 4 3 1

CN2 27

WHT

RT61RT62 RT68 LEV

MODEL WIRING DIAGRAM

OUTDOOR UNIT

: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

LREACTOR

IPM INTELLIGEMT POWER MODULE

HPS HIGH PRESSURE SWITCH

CT61

CT1, 2 CURRENT TRANSFORMER

HC930 INTELLIGEMT 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

MC COMPRESSOR

R64A,B RESISTOR

PFC

NR64 VARISTOR

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

OB389 --1qxp 05.1.26 18:14 Page 10

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