Mitsubishi MU-A07YV, MU-A12YV SERVICE MANUAL

SERVICE MANUAL

HFC

utilized

R410A

SPLIT-TYPE, AIR CONDITIONERS

Wireless type Models

Revision A:

●MU-A12YV - can be connected to MCF-A12WV - .

Please void OB330.

No. OB330

REVISED EDITION-A

MU-A07YV MU-A09YV MU-A12YV -

Indication of model name

MU-A07YV MU-A09YV MU-A12YV -

CONTENTS

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

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

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

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS·························7

6. WIRING DIAGRAM ············································7

7. REFRIGERANT SYSTEM DIAGRAM················8

8. PERFORMANCE CURVES································9

9. TROUBLESHOOTING······································20

10. DISASSEMBLY INSTRUCTIONS·····················23

11. PARTS LIST······················································26

NOTE:

•This service manual describes technical data of outdoor units.

•As for indoor units MSC-A07YV - , MSC-A09YV - and MSC-A12YV - , refer to the service manual OB329.

•As for indoor unit MCF-A12WV - , refer to the service manual OB338.

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

Revision A:

•MU-A12YV - can be connected to MCF-A12WV - . SPECIFICATION and PERFORMANCE CURVES have been added.

E1E1

MU-A07WV- ➔MU-A07YV- MU-A09WV- ➔MU-A09YV-

1. Outdoor heat exchanger has changed.

2. Outdoor fan motor has changed. (RA6V23-FC➔RC6V20-AC)

MU-A12WV- ➔MU-A12YV-

1. Outdoor heat exchanger has changed.

2. Outdoor fan motor has changed. (RA6V33-DC➔ RA6V33-FC)

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.

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

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

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

Conversion chart of refrigerant temperature and pressure

(MPa [Gauge])

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

Saturated liquid pressure

0.0

-0.5

-30 -20 -10 0 10 20

R410A R22

40 50 60

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/

(:)

[Gauge])

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

17 22 26

Dimension of flare nut

R22

17 22 24

2.Refrigerant piping

Wall thickness

Outside diameter

Pipe

For liquid For gas

6.35

9.52

12.7

0.8 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. Never use any pipe with a thickness less

than 0.8mm, 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.

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

(back and side)

Capacity Dehumidification Outdoor air flow Power outlet Running current Power input Auxiliary heater 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 Fan speed Fan speed regulator Refrigerant filling capacity (R410A) Refrigerating oil (Model)

R/h

K /h

A A

A(kW)

A A A

rpm

kg cc

MU-A07YV -

Single phase

230V,50Hz

2.78

0.22

RN092VHSHT

600 C-R 3.87 C-S 6.14

RC6V20-AC

WHT-BLK 410

BLK-RED 433 780o540o255

34 45

735

0.60

350 (NEO22 )

2.3

0.9

1,686

3.00 680

– 98 23

3.22

MU-A09YV -

Single phase

230V,50Hz

RN099VHSHT

700 C-R 3.40 C-S 4.56

RC6V20-AC WHT-BLK 410 BLK-RED 433

780o540o255

34 45

735

0.60

350 (NEO22 )

2.55

1.1

1,686

3.32 760

– 99 24

3.10

0.22

3.21

MU-A12YV -

Indoor unit

MSC-A12YV -

Single phase

230V,50Hz

1.7

1,914

4.92

97 29

RN135VHSHT

900 C-R 2.79 C-S 3.36

RA6V33-FC

WHT-BLK 223

BLK-RED 228 780o540o255

36 49

825

0.75

620 (NEO22)

3.5

1,100

–

4.61

0.31

3.07

Compressor

Electrical

data

Fan

motor

Special

remarks

Capacity

Coefficient of performance(C.O.P)

Outdoor unit power supply

Outdoor model

MU-A12YV -

Indoor unit

MCF-A12WV -

Single phase

230V,50Hz

1.5

1,914

4.89

98 29

RN135VHSHT

900 C-R 2.79 C-S 3.36

RA6V33-FC

WHT-BLK 223

BLK-RED 228 780o540o255

36 49

825

0.75

620 (NEO22)

3.5

1,104

–

4.58

0.31

3.02

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

MU-A07YV MU-A09YV MU-A12YV -

SPECIFICATION

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB24°C

Indoor-Outdoor piping length : 5m

63 125 250 500 1000 2000 4000 8000

APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE

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

Test conditions,

Cooling :DB35: WB24:

MU-A12YV- E1

COOL

FUNCTION

SPL(dB(A)) LINE

OUTDOORUNIT

MICROPHONE

63 125 250 500 1000 2000 4000 8000

APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE

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

Test conditions,

Cooling : DB27: WB19:

MU-A07YV- E1 MU-A09YV- E1

COOL

FUNCTION

SPL(dB(A)) LINE

NOISE CRITERIA CURVES

OUTLINES AND DIMENSIONS

MU-A07YV - MU-A09YV - MU-A12YV -

OUTDOOR UNIT

Air in

320

109

Air in

147

122

110

Air out

500 780

Drainage 3holes [33

540

260

E1E1E1

255

REQUIRED SPACE

100mm or more

320

285

155

400mm or more

Service panel

104

Unit: mm

100mm or more

350mm or more

Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35

35-

43-

Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52 (MU-A07/A09YV

[12.7 (MU-A12YV

)

MU-A07YV - MU-A09YV - MU-A12YV -

OUTDOOR UNIT

SYMBOL

C1 C2

DSAR

NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.

WIRING DIAGRAM

MODELS WIRING DIAGRAM

TO INDOOR UNIT

CONNECTING

12V

CIRCUIT BREAKER

POWER SUPPLY ~/N 230V 50Hz

NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER

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

3. Symbols below indicate.

/: Terminal block, : Connector

TB2

TB1

GRN/YLW

SYMBOL

E1E1E1

WHT

52C

BLK

BRN

BLU

52C

COM

COMPRESSOR(INNER PROTECTOR) OUTDOOR FAN MOTOR

(INNER FUSE/INNER PROTECTOR)

WHT WHT

NAME NAME

DSAR

RED BLK

WHT

BLU

RED

SYMBOL TB1,TB2

52C

WHT

BLK

RED

TERMINAL BLOCK COMPRESSOR CONTACTOR

REFRIGERANT SYSTEM DIAGRAM

MU-A07YV MU-A09YV -

OUTDOOR UNIT

Flared connection

Unit:mm

Refrigerant pipe [9.52 (with heat insulator)

Stop valve (with service port)

Muffler

Outdoor heat exchanger

Compressor

Strainer #100

Refrigerant pipe [6.35 (with heat insulator)

MU-A12YV -

OUTDOOR UNIT

Flared connection

Refrigerant pipe [12.7 (with heat insulator)

Stop valve (with service port)

Capillary tube [3.0x[1.4x900

Refrigerant flow in cooling

Unit:mm

Muffler

Outdoor heat exchanger

Compressor

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Stop valve

Strainer #100

Capillary tube [3.0x[1.4x550

Refrigerant flow in cooling

MAX. REFRIGERANT PIPING LENGTH

Refrigerant piping

Model

MU-A07YV - E1 MU-A09YV - E1

MU-A12YV - E1

Max. length : m

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

Gas

9.52

12.7

Liquid

6.35

Indoor unit

Gas 0.43

Liquid 0.5

Outdoor unit

Gas 0

Liquid 0

MAX. HEIGHT DIFFERENCE

Height difference should be within 10m regardless of which unit, indoor or outdoor position is high.

Indoor unit

Refrigerant Piping

w Max. Height difference 10m

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model

MU-A07YV - E1 MU-A09YV - E1

MU-A12YV - E1

PERFORMANCE CURVES

Outdoor unit precharged

600

750

Max.length

Refrigerant piping length (one way)

10m

15m

160

Calculation : Xg=20g/m x(A-7)m

Outdoor unit

20m

260

25m

360

MU-A07YV - MU-A09YV - MU-A12YV -

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.

E1E1E1

(1) GUARANTEED VOLTAGE

198~264V

(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 Indoor air wet/dry-bulb temperature difference on the left side of the chart on 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.

Cooling

}

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 to start the EMERGENCY COOL 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.

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