Mitsubishi MUH-A07YV - E1, MUH-A09YV - E1, MUH-A12YV - E1 Service Manual

SERVICE MANUAL

HFC

utilized

R410A

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Wireless type Models

Revision A:

●MUH-A12YV - can be connected to MCFH-A12WV - .

Please void OB331.

No. OB331

REVISED EDITION-A

MUH-A07YV MUH-A09YV MUH-A12YV -

Indication of model name

MUH-A07YV MUH-A09YV MUH-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. MICROPROCESSOR CONTROL ····················22

10. SERVICE FUNCTIONS·····································24

11. TROUBLESHOOTING ······································24

12. DISASSEMBLY INSTRUCTIONS·····················31

13. PARTS LIST······················································34

NOTE:

•This manual describes technical data of outdoor units.

•As for indoor units MSC-A07/A09/A12YV - , refer to the service manual OB329.

•As for indoor unit MCFH-A12WV - , refer to the service manual OB336.

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:

•MUH-A12YV - can be connected to MCFH-A12WV - . SPECIFICATION, PERFORMANCE CURVES and TROUBLESHOOTING have been added.

E1E1

MUH-A07WV- ➔MUH-A07YV-

1. Outdoor heat exchanger has changed.

2. Outdoor fan motor has changed. (RA6V23-FB➔RC6V20-AB)

MUH-A09WV- ➔MUH-A09YVMUH-A12WV- ➔MUH-A12YV-

1. Outdoor heat exchanger has changed.

2. Outdoor fan motor has changed. (RA6V33-DB➔RA6V33-FB)

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])

R410A

Pipe diameter

6.35

9.52

12.7

17 22 26

Dimension of flare nut

R22

17 22 24

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)

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)

Drain socket Drain cap

1 2

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) Thermistor RT61 (at 0:)

R/h

K /h

A A

A(kW)

A A A

rpm

kg cc

MUH-A07YV -

Single phase

230V,50Hz

1,686

—

0.22

RN092VHSHT

600 C-R 3.87 C-S 6.14

RC6V20-AB

WHT-BLK 410

BLK-RED 433 780o540o255

35 47

735

0.62

350 (NEO22)

33.18

Cooling

2.3

0.9

3.00 680

2.78

3.22

Heating

2.5 —

2.86 655

2.64

3.62

MUH-A09YV - E1

Single phase

230V,50Hz

1,710

—

0.31

RN104VHSHT

700 C-R 3.40 C-S 4.56

RA6V33-FB

WHT-BLK 223

BLK-RED 228 780o540o255

38 49

825

1.00

350 (NEO22)

33.18

Cooling

2.55

1.1

3.32 760

3.01

3.21

Heating

3.05 —

3.52

805

3.21

3.69

MUH-A12YV -

Indoor model

MSC-A12YV -

Single phase

230V,50Hz

1,710

—

0.31

RN135VHSHT

900 C-R 2.79 C-S 3.36

RA6V33-FB

WHT-BLK 223

BLK-RED 228 780o540o255

40 49

825

1.00

620 (NEO22)

33.18

Cooling

3.5

1.7

4.65

1,050

4.34

3.21

Heating

3.9 —

4.60

1,040

4.29

3.61

Compressor

Electrical

data

Fan

motor

Special

remarks

Capacity

Coefficient of performance (C.O.P)

Outdoor unit power supply

Function

Outdoor model

MUH-A12YV -

Indoor model

MCFH-A12WV -

Single phase

230V,50Hz

1,710

—

0.31

RN135VHSHT

900 C-R 2.79 C-S 3.36

RA6V33-FB

WHT-BLK 223

BLK-RED 228 780o540o255

40 49

825

1.00

620 (NEO22)

33.18

Cooling

3.5

1.5

4.85

1,094

4.54

3.02

Heating

3.7 —

4.23 954

3.92

3.63

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

MUH-A07YV MUH-A09YV MUH-A12YV -

SPECIFICATION

ACCESSORIES

MUH-A07YVMUH-A09YVMUH-A12YV-

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C Indoor-Outdoor piping length : 5m

Outdoor DB35°C WB24°C Outdoor DB 7°C/WB 6°C

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:

Heating :DB 7: WB 6:

MUH-A09YV- E1 MUH-A12YV- E1

COOL

FUNCTION

HEAT

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 :DB35: WB24: Heating :DB 7: WB 6:

MUH-A07YV- E1

COOL

FUNCTION

HEAT

SPL(dB

(A)) LINE

NOISE CRITERIA CURVES

SYMBOL

T61

TB1,TB2

21S4

52C

SYMBOL

NR61 RT61

SR61,SR62

SYMBOL

C65

DSAR

F61

NAME

NAME NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(2A) COMPRESSOR(INNER PROTECTOR)

VARISTOR DEFROST THERMISTOR SOLID STATE RELAY

TRANS FORMER TERMINAL BLOCK R.V. COIL COMPRESSOR CONTACTOR

OUTDOOR FAN MOTOR (INNER FUSE/INNER PROTECTOR)

OUTLINES AND DIMENSIONS

MUH-A07YV - MUH-A09YV - MUH-A12YV -

OUTDOOR UNIT

109

Air in

Drainage 3holes [33

540

260

320

Air in

147

122

110

Air out

500 780

255

285

155

320

E1E1E1

REQUIRED SPACE

100mm or more

104

100mm or more

400mm or more

Service panel

Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35

35-

43-

Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52 (MUH-A07/A09YV [12.7 (MUH-A12YV

Unit: mm

100mm or more

350mm or more

)

WIRING DIAGRAM

MUH-A07YV MUH-A09YV MUH-A12YV -

OUTDOOR UNIT

TO INDOOR UNIT CONNECTING 12V

CIRCUIT BREAKER

POWER SUPPLY ~/N

50Hz

230V

MODELS WIRING DIAGRAM

DSAR

RT61

1 2 3

TAB20

CN661

CN730

F61

TB2

3 N

TB1

GRN/YLW

RED BLK

BRN

BLU

T61

21S4

CN721

NR61

52C

DEICER P.C.BOARD

RED BLK

SR62

SR61

WHT

CN711

1 2 3

C65

WHT BLK RED

NOTE: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, : Connector

REFRIGERANT SYSTEM DIAGRAM

MUH-A07YV MUH-A09YV -

OUTDOOR UNIT

Refrigerant pipe [ 9.52

(with heat insulator)

Flared connection

Refrigerant pipe [6.35

(with heat insulator)

Stop valve (with service port)

Strainer #100

Stop valve

4-way valve

Defrost thermistor RT61

Muffler

Compressor

Capillary tube

[3.0x[1.4x500(MUH-A07YV) [3.0x[1.4x600(MUH-A09YV)

Check valve

Capillary tube

[3.0x[1.4x600(MUH-A07YV) [3.0x[1.4x1000(MUH-A09YV)

Refrigerant flow in cooling Refrigerant flow in heating

Unit:mm

Outdoor heat exchanger

Capillary tube [3.0x[1.4x800(2 pcs)

(MUH-A07YV) [3.0x[1.4x500(2 pcs)

(MUH-A09YV)

R.V. coil heating ON cooling OFF

MUH-A12YV -

OUTDOOR UNIT

Refrigerant pipe [12.7

(with heat insulator)

Flared connection

Refrigerant pipe [6.35

(with heat insulator)

4-way valve

Stop valve (with service port)

Strainer #100

Stop valve

Muffler

Compressor

Capillary tube [3.0x[1.6x1050

Check valve

Defrost thermistor RT61

Unit:mm

Outdoor heat exchanger

Capillary tube [3.0x[1.4x500(2pcs)

Capillary tube [3.0x[1.6x600

R.V. coil heating ON cooling OFF

Refrigerant flow in cooling Refrigerant flow in heating

MAX. REFRIGERANT PIPING LENGTH

Refrigerant piping

Model

Max. length : m

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

Liquid

Indoor unit

Outdoor unit

MUH-A07YV - E1 MUH-A09YV - E1

MUH-A12YV - E1

9.52

12.7

MAX. HEIGHT DIFFERENCE

Indoor unit

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

w Max. Height difference 10m

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model

MUH-A07YV - E1

Outdoor unit precharged

620

Gas 0.43

6.35 Liquid 0.5

Refrigerant Piping

Max.length

Refrigerant piping length (one way)

10m

15m

20m

Gas 0

Liquid 0

Outdoor unit

25m

MUH-A09YV - E1 MUH-A12YV - E1

PERFORMANCE CURVES

1000

MUH-A07YV - MUH-A09YV - MUH-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

160

Calculation : Xg=20g/m 5 x(A-7)m

260

360

(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 (5) Indoor intake air dry-bulb temperature : °CDB (6) Outdoor intake air wet-bulb temperature : °CWB (7) Total input : W Indoor air wet/dry-bulb temperature difference on the left side of the chart on page 10 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

Heating

MSC-A07YV - E1

MUH-A07YV - E1

MUH-A12YV - E1

MSC-A12YV - E1

MUH-A09YV - E1

MSC-A09YV - E1

8.5

7.8

7.1

6.4

5.8

5.1

9.6

8.8

8.0

7.2

6.5

5.7

11.0

10.0

9.1

8.2

7.4

6.5

8.7

8.0

7.3

6.6

5.9

5.3

MUH-A12YV - E1

MCFH-A12WV - E1

20.4

18.8

17.2

15.7

14.1

12.5

11.0

9.4

19.2

17.8

16.3

14.8

13.3

11.8

10.4

8.9

MSC-A07YV - E1

MUH-A07YV - E1

MUH-A09YV - E1

MSC-A09YV - E1

MUH-A12YV - E1

MSC-A12YV - E1

25.2

23.3

21.4

19.4

17.5

15.5

13.6

11.7

MUH-A12YV - E1

MCFH-A12WV - E1

18.6

17.2

15.7

14.3

12.9

11.5

10.0

8.6

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(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

Wet-and dry-bulb thermometers

8-1.CAPACITY AND THE INPUT CURVES

OUTDOOR UNIT

Wet-and dry-bulb thermometers

NOTE:The above curves are for the heating operation without any frost.

8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

18 32

230V

15 20

25 60

70(%)

35(:)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20

25 60

30 70(%)

35(:)

18 32

230V

18 32

230V

15 20

25 6030 70(%)

35(:)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20

25 60

30 70(%)

35(:)

18 32

230V

18 32

230V

15 20

25 60

70(%)

35(:)

0.7

0.8

0.9

1.0

1.1

1.2

1.3

15 20

25 60

30 70(%)

35(:)

18 32

230V

COOL operation

① Both indoor and outdoor unit are under the same temperature/humidity condition.

Dry-bulb temperature

20 25

Relative humidity(%)

50 60

30 70

➁ Air flow should be set at MAX.

③ 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] )

(kgf/F[Gauge])(MPa[Gauge])

Outdoor low pressure

(kgf/F[Gauge])(MPa[Gauge])

MUH-A07YV -