Mitsubishi MU-A18WV-E1, MU-A24WV-E1, MU-A30WV-E1 Service Manual

SERVICE MANUAL

SPLIT-TYPE, AIR CONDITIONERS

Wireless type Models

No. OB326

MU-A18WV MU-A24WV MU-A30WV -

Indication of model name

MU-A18WV -

CONTENTS

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

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

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

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

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

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

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

8. PERFORMANCE CURVES······························14

9. MICROPROCESSOR CONTROL ····················22

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

11. DISASSEMBLY INSTRUCTIONS·····················32

12. PARTS LIST······················································38

NOTE:

•This service manual describes technical data of outdoor units. As for indoors unit MS-A18WV- , MS-A24WV- and MS-A30WV- , refer to the service manual OB325.

E1E1E1

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

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non 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 CO

TECHNICAL CHANGES

MU-18RV - ➔MU-A18WV -

1. Refrigerant has changed. (R22➔R410A)

2. Refrigerant system diagram has changed.

• Diameter of stop valve has changed. (Gas: [15.88➔[12.7)

• Accumulator has removed.

3. Oil separator has been added.

4. Compressor has changed. (PH33VPET➔RN196VHSHT)

MU-24RV - ➔MU-A24WV -

1. Refrigerant has changed. (R22➔R410A)

2. Refrigerant system diagram has changed.

• Diameter of stop valve has changed. (Liquid: [9.52➔[6.35)

3. Compressor has changed. (NH47VMDT➔NN29VBAHT)

MU-30RV - ➔MU-A30WV -

1. Outdoor model has changed.

2. Refrigerant has changed. (R22➔R410A)

3. Refrigerant system diagram has changed.

• Accumulator has removed.

4. Compressor has changed. (NH56VNHT➔NN37VAAHT)

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.

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

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

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.

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

17 22 26 29

Dimension of flare nut

R22

17 22 24 27

2.Refrigerant piping

Wall thickness

Outside diameter

Pipe

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

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.

Drainage hose

Piping

Air inlet

Air outlet

Drain outlet

(back and side)

Air outlet

(back and side)

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

MU-A18WV MU-A24WV -

E1 E1

MU-A30WV -

Outdoor model

Function

Power supply

Capacity Dehumidification Air flow(High/Low ) Power outlet Starting current Compressor motor current Fan motor current

Model Output Winding resistance(at20:) Model Winding resistance(at20:) Dimensions WOHOD Weight Sound level(High) Fan speed(High/Low ) Fan speed regulator Refrigerant filling capacity(R410A) Refrigerating oil (Model) Thermistor RT62(at25:) Thermistor RT63(at0:)

R/h

K /h

A A A A

rpm

cc k" k"

MU-A30WV -

Cooling

Single phase

230V, 50Hz

8.5

4.6

2,940/1,470

25 90

13.85

0.57

2.61

NN37VAAHT

2,500 C-R 0.64 C-S 1.63

RA6V75-AB

WHT-BLK 62.8 BLK-YLW 55.9

YLW-RED 26.0

840o850o330

75 55

805/435

2.30

1,300 (NEO 22)

231.44

33.18

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

Outdoor model

Function

Power supply

Capacity Dehumidification Air flow(High) Power outlet Starting current Compressor motor current Fan motor current

Model Output Winding resistance(at20:) Model Winding resistance(at20:) Dimensions WOHOD Weight Sound level(High) Fan speed(High) Fan speed regulator Refrigerant filling capacity(R410A) Refrigerating oil (Model)

r/h

K /h

A A A A

rpm

kg cc

MU-A18WV -

Cooling

Single phase

230V, 50Hz

5.0

2.5

2,196

15 37

7.51

0.39

2.76

RN196VHSHT

1,300 C-R 1.80 C-S 3.00

RA6V50-OG

WHT-BLK 116

BLK-RED 111

850o605o290

44 52

828

1.40

520 (NEO22)

MU-A24WV -

Cooling

Single phase

230V, 50Hz

6.5

3.4

2,322

25 74

10.27

0.55

2.62

NN29VBAHT

1,900 C-R 0.80 C-S 1.64

RA6V60-MA WHT-BLK 71 BLK-RED 89

850o605o290

60 53

873

1.90

1,200 (NEO22)

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

SPECIFICATION

NOTE: Test conditions are based on JIS C 9612.

w Reference value

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB(24°C)

Indoor-Outdoor piping length 5m

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

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

NOISE CRITERIA CURVES

MU-A18WV-

MU-A24WV-

FAN SPEED

High

SPL(dB(A)) LINE

Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

NC-70

NC-60

NC-50

NC-40

NC-30

MU-A30WV-

Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:

FAN SPEED

SPL(dB(A)) LINE

High

APPROXIMATE

THRESHOLD OF HEARING FOR CONTINUOUS

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

NOISE

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

APPROXIMATE

THRESHOLD OF HEARING FOR CONTINUOUS

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

NOISE

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

OUTDOOR UNIT

MICROPHONE

NC-20

OUTLINES AND DIMENSIONS

MU-A18WV- MU-A24WV-

OUTDOOR UNIT

Drainage hole [16.2

248

Air in

605

Drainage 3holes [33

292

355

350

Air in

Air out

183

500 850

E1E1

100mm or more

290

310

100mm or more

345

500mm or more

Service panel

Unit: mm

350mm or more

Liquid refrigerant pipe joint

Refregerant pipe (flared) [6.35

35-

30-

157

100

161

Gas refregerant pipe joint

Refregerant pipe (flared) [12.7 (MU-A18WV) [15.88 (MU-A24WV)

MU-A30WV-

OUTDOOR UNIT

299

330

515

121

500

840

100mm or more

360

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

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

350mm or more

Service panel

Liquid refrigerant pipe joint Refrigerant pipe (flared) [9.52

850

430

30-

35-

155

Gas refrigerant pipe joint

198

Refrigerant pipe (flared) [15.88

WIRING DIAGRAM

MU-A18WV -

OUTDOOR UNIT

TO INDOOR UNIT CONNECTING

MODEL WIRING DIAGRAM

TB2

WHT

BLK

52C

12V

CIRCUIT BREAKER

POWER SUPPLY ~/N

230V 50Hz

SYMBOL

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

DSAR

NOTES:

SURGE ABSORBER

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

NAME

: Connector

TB1

BLU

GRN/YLW

SYMBOL

MC MF

TB1,TB2

52C

BRN

NO COM

NAME COMPRESOR (INNER PROTECTOR) OUTDOOR FAN MOTOR (INNER PROTECTOR) TERMINAL BLOCK

BRN

WHT WHT

DSAR

SYMBOL

52C

RED

BLK

RED

ORN

WHT

BLU

COMPRESSOR CONTACTOR

RED ORN WHT BLK

NAME

MU-A24WV -

OUTDOOR UNIT

TO INDOOR UNIT CONNECTING

MODEL WIRING DIAGRAM

TB2

WHT

BLK

12V

DSAR

52C

CIRCUIT BREAKER

POWER SUPPLY ~/N 230V 50Hz

BRN

WHT

52C

BRN

BLU

GRN/YLW

TB1

SYMBOL

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

DSAR

NOTES:

SURGE ABSORBER

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

NAME

: Connector

SYMBOL

TB1,TB2

COMPRESSOR (INNER PROTECTOR) OUTDOOR FAN MOTOR (INNER PROTECTOR) TERMINAL BLOCK

COM

NAME

COM

SYMBOL

52C

WHT

RED

BLK

ORN

WHT BLU

RELAY COMPRESSOR CONTACTOR

1 2 3 4

REDRED ORN WHT BLK

NAME

MU-A30WV -

OUTDOOR UNIT

MODEL WIRING DIAGRAM

CIRCUIT BREAKER

TB1

~/N 230V 50Hz

POWER SUPPLY

TB2

12V

TO INDOOR UNIT CONNECTING

RT62RT63

LEV

YLW

BLK

WHT

ORN

RED

3456

WHT

ORN

CN711

X52

COM

CN730 F61

RED

BLK

RED

TAB52

7 5 3 1

BLU

RED

BLU

BRN

DSAR

CN662

X52

GRN/YLW

BLU

BRN

DEICER P. C. BOARD

BRN

52C

WHTWHT

YLW

CN724

A1 A2

SR62 SR61

T61

123

NR61

WHT

52C

BLK

SYMBOL

CZ C1 C2

DSAR

F61

LEV

NOTE 1. Use copper conductors only (For field wiring).

CZ SURGE ABSRBER COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(3.15A) EXPANSION VALVE COIL

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

NAME

SYMBOL

MF NR61 RT62 RT63 SR61

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

SYMBOL

SR62

TB1 TB2 T61 X52 52C

SOLID STATE RELAY TERMINAL BLOCK TERMINAL BLOCK TRANSFORMER CONTACTOR COMPRESSOR CONTACTOR

REFRIGERANT SYSTEM DIAGRAM

MU-A18WV -

OUTDOOR UNIT

Refrigerant pipe [12.7 (with heat insulator)

Flared connection

Stop valve (with service port)

Stop valve

Capillary tube

[2.5o[0.6o1,000

Oil separator

Compressor

Strainer

#100

Unit:mm

Outdoor heat exchanger

MU-A24WV -

OUTDOOR UNIT

Refrigerant pipe[6.35 (with heat insulator)

Refrigerant pipe [15.88 (with heat insulator)

Stop valve (with service port)

Flared connection

Muffler

Capillary tube

[3.0o[1.6o600

Refrigerant flow in cooling

Muffler

#100

Outdoor heat exchanger

Compressor

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Stop valve

Capillary tube

[3.0X[2.0X900

Refrigerant flow in cooling

MU-A30WV -

Indoor unit

wMax. Height

difference: 10m(MS-A18/A24WV)/ 15m(MS-A30WV)

Refrigerant Piping Max. Length

w Height difference should be within 10m(MS-A18/A24WV)/ 15m(MS-A30WV) regardless of which unit, indoor or outdoor position is high.

Outdoor unit

Outdoor heat exchanger

Flared connection

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

Refrigerant pipe [15.88 (with heat insulator)

Refrigerant pipe [9.52 (with heat insulator)

LEV

Muffler

Strainer

Ambient temperature thermistor RT63

Capillary tube [4.0✕[2.4✕200 (Upper path)

Capillary tube [4.0✕[2.4✕100 (Lower path)

Model

Piping size O.D : mm Length of connecting pipe : m

Refrigerant piping

Max. length : m

Indoor unit

Gas 0.43

Liquid 0.5

Gas

12.7

15.88

Liquid

6.35

9.52

MU-A18WV - E1

MU-A24WV - E1 MU-A30WV - E1

Outdoor unit

Gas 0

Liquid 0

OUTDOOR UNIT

Unit:mm

MAX. REFRIGERANT PIPING LENGTH

MAX. HEIGHT DIFFERENCE

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