Mitsubishi Electric MU-A18WV-E1 Manual de usuario

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······························14

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

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

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

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

Wireless type

Models

MU-A18WV -

MU-A24WV -

MU-A30WV - E1

SPLIT-TYPE, AIR CONDITIONERS

MU-A18WV - E1

Indication of model name

NOTE:

•This service manual describes technical data of outdoor units.

As for indoor units MS-A18WV- , MS-A24WV- and MS-A30WV- , refer to the service manual

OB325. E1E1E1

No. OB326

REVISED EDITION-A

Revision A:

●Resistance of LEV (Expansion valve) has been

modified.

● Power input and others have been added to

SPECIFICATION.

HFC

utilized

R410A

Please void OB326.

OB326A-1.qxp 04.2.9 10:41 AM Page 1

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-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

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 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 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.

Revision A:

•Resistance of LEV (Expansion valve) has been modified. (30.3 "~ 37.0 "➔41.0 "~ 49.0 ")

TROUBLESHOOTING has been partially modified.

•Running current, power input and power factor have been added.

SPECIFICATION has been partially modified.

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)

E1E1

OB326A-1.qxp 04.2.9 10:41 AM 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 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

(:)

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.

OB326A-1.qxp 04.2.9 10:41 AM 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 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

OB326A-1.qxp 04.2.9 10:41 AM 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)

OUTDOOR UNIT

MU-A18WV -

MU-A24WV - E1

E1 MU-A30WV - E1

SPECIFICATION

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)

r/h

K/h

rpm

MU-A18WV - E1

Cooling

Single phase

230V, 50Hz

5.0

2.5

2,196

7.90

1,750

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

828

1.40

520 (NEO22)

MU-A24WV - E1

Cooling

Single phase

230V, 50Hz

6.5

3.4

2,322

10.82

2,420

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

873

1.90

1,200 (NEO22)

Electrical

data

Compressor

Fan

motor

Special

remarks

Coefficient of performance(C.O.P)

Capacity

NOTE: Test conditions are based on JIS C 9612.

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB(24°C)

Indoor-Outdoor piping length : 5m

OB326A-1.qxp 04.2.9 10:41 AM Page 5

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)

Refrigerating oil (Model)

Thermistor RT62(at 25:)

Thermistor RT63(at 0:)

R/h

K/h

rpm

MU-A30WV - E1

Cooling

Single phase

230V, 50Hz

8.5

4.6

2,940/1,470

14.42

3,191

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

55/53

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

NOTE: Test conditions are based on JIS C 9612.

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB(24°C)

Indoor-Outdoor piping length : 5m

wReference value

OB326A-1.qxp 04.2.9 10:41 AM Page 6

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

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

MU-A18WV- E1 MU-A24WV- E1

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

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

MU-A30WV- E1

OUTDOOR UNIT

MICROPHONE

10 63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

Test conditions,

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

SPL(dB(A)) LINE

High

FAN SPEED

OB326A-1.qxp 04.2.9 10:41 AM Page 7

OUTLINES AND DIMENSIONS

MU-A30WV- E1

OUTDOOR UNIT

Unit: mm

OUTDOOR UNIT

MU-A18WV- MU-A24WV- E1E1

100mm or more

350mm or more

500mm or more

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 (MU-A18WV)

[15.88 (MU-A24WV)

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) [9.52

OB326A-1.qxp 04.2.9 10:41 AM Page 8

WIRING DIAGRAM

MU-A24WV - E1 MODEL WIRING DIAGRAM

OUTDOOR UNIT

TB1

RED MC

~/N

230V 50Hz

POWER SUPPLY

52C

GRN/YLW

CIRCUIT BREAKER

REDRED

WHT

BLU

ORN

C2 WHT

4BLK

2ORN

COM

BLU

COM

52C BLK S

12V

INDOOR UNIT

CONNECTING

TO X1

1BLK

BRN

WHT

TB2

DSAR

WHT

BLU

BRN

WHT

BRN

MU-A18WV - E1 MODEL WIRING DIAGRAM

OUTDOOR UNIT

BRN

WHT

POWER SUPPLY

230V 50Hz

~/N

TB1

CIRCUIT BREAKER

BLU

GRN/YLW

BRN

NO COM

52C

TB2

CONNECTING

12V

INDOOR UNIT

BLK

WHT

52C

WHT

ORN

RED

BLK

ORN

WHT

RED

DSAR

BLU

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

DSAR

NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

SYMBOL

TB1,TB2

NAME

COMPRESOR (INNER PROTECTOR)

OUTDOOR FAN MOTOR (INNER PROTECTOR)

TERMINAL BLOCK

SYMBOL

52C NAME

COMPRESSOR CONTACTOR

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

DSAR

NAME

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

SYMBOL

TB1,TB2

NAME

COMPRESSOR (INNER PROTECTOR)

OUTDOOR FAN MOTOR (INNER PROTECTOR)

TERMINAL BLOCK

SYMBOL

52C

NAME

RELAY

COMPRESSOR CONTACTOR

OB326A-1.qxp 04.2.9 10:41 AM Page 9

OUTDOOR UNIT

DEICER

P. C. BOARD

YLW

BLK

WHT

RED

BRN

CN730

YLW

BLK

WHT

CIRCUIT BREAKER

152C 2

CZ WHTWHT

RED C2

ORN

A1 A2

BLU 52C

DSAR

TO INDOOR UNIT CONNECTING

12V

WHT

BLK

RED

BLU

NR61 3

BLU

T61

TB1

TB2

GRN/YLW

POWER SUPPLY

~/N 230V 50Hz

X52

BLU

BRN

BLU

BRN

SR62

SR61

COM NO

F61

TAB52

X52

CN711

CN724

CN662

RT62 RT63

123

ORN

RED

3456

LEV

SYMBOL

SR62

TB1

TB2

T61

X52

52C

SYMBOL

NR61

RT62

RT63

SR61

SYMBOL

DSAR

F61

LEV

NAME NAME NAME

CZ SURGE ABSRBER

COMPRESSOR CAPACITOR

OUTDOOR FAN CAPACITOR

SURGE ABSORBER

FUSE(3.15A)

EXPANSION VALVE COIL

COMPRESSOR (INNER PROTECTOR)

OUTDOOR FAN MOTOR (INNER PROTECTOR)

VARISTOR

DISCHARGE TEMPERATURE THERMISTOR

AMBIENT TEMPERATURE THERMISTOR

SOLID STATE RELAY

TERMINAL BLOCK

TRANSFORMER

CONTACTOR

COMPRESSOR CONTACTOR

NOTE 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

MU-A30WV - E1 MODEL WIRING DIAGRAM

OB326A-1.qxp 04.2.9 10:41 AM Page 10

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