Mitsubishi Electric MUH-A07YV-E1 Manuel utilisateur

SERVICE MANUAL

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 ····················20

10. SERVICE FUNCTIONS·····································22

11. TROUBLESHOOTING······································22

12. DISASSEMBLY INSTRUCTIONS·····················29

13. PARTS LIST······················································32

Wireless type

Models

MUH-A07YV -

MUH-A09YV -

MUH-A12YV -E1

No. OB331

HFC

utilized

R410A

SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS

MUH-A07YV -

MUH-A09YV -

MUH-A12YV - E1

Indication of

model name

NOTE:

•This manual describes technical data of outdoor units.

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

OB331-1.qxp 03.12.3 1:20 PM Page 1

TECHNICAL CHANGES

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.

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

MUH-A07WV- ➔MUH-A07YV-

1. Outdoor heat exchanger has changed.

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

MUH-A09WV- ➔MUH-A09YV-

MUH-A12WV- ➔MUH-A12YV-

1. Outdoor heat exchanger has changed.

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

E1E1

OB331-1.qxp 03.12.3 1:20 PM 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

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. Never use any pipe with a thickness less

than 0.8mm, as the pressure resistance is insufficient.

Wall

thickness

Outside diameter

Pipe mm

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

OB331-1.qxp 03.12.3 1:20 PM 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

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.

OB331-1.qxp 03.12.3 1:20 PM Page 4

PART NAMES AND FUNCTIONS

Air inlet

Piping

Drain hose

Air outlet

Drain outlet

(back and side)

OUTDOOR UNIT

MUH-A07YV -

MUH-A09YV -

MUH-A12YV - E1

ACCESSORIES

MUH-A07YV-

MUH-A09YV-

MUH-A12YV- E1

Drain socket

Drain cap 1

SPECIFICATION

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(kW)

rpm

MUH-A07YV - E1

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

735

0.62

350 (NEO22)

33.18

2.3

0.9

3.00

680

2.78

3.22

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

825

1.00

350 (NEO22)

33.18

2.55

1.1

3.32

760

3.01

3.21

3.05

—

3.52

805

3.21

3.69

MUH-A12YV - E1

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

825

1.00

620 (NEO22)

33.18

3.5

1.7

4.65

1,050

4.34

3.21

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

Outdoor model

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C

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

Indoor-Outdoor piping length 5m

OB331-1.qxp 03.12.3 1:20 PM Page 5

NOISE CRITERIA CURVES

10 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

10 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

OB331-1.qxp 03.12.3 1:20 PM Page 6

OUTLINES AND DIMENSIONS

WIRING DIAGRAM

MODELS WIRING DIAGRAM

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)

MUH-A07YV -

MUH-A09YV -

MUH-A12YV - E1

CN661

2CN721

21S4

SR62

SR61

TAB20

GRN/YLW

BLU

CIRCUIT BREAKER

POWER SUPPLY

BLU

BRN

DSAR

BLK

BRN

RED

DEICER P.C.BOARD

BLK

RED

WHT

CN730

RT61

BLK

RED

WHT

12V

CONNECTING

INDOOR UNIT

TB2

TB1

~/N

NR61

F61

T61 C65

CN711

52C

230V50Hz

OUTDOOR UNIT

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

320

43-

35-

155

104

260

780

500

122

540

320

285

255

Service panel

Gas refrigerant

pipe joint

Refrigerant pipe

(flared) [9.52 (MUH-A07/A09YV)

[12.7 (MUH-A12YV)

Liquid refrigerant

pipe joint

Refrigerant pipe

(flared) [6.35

Air out

Air in

109 32

110

147

Drainage

3holes [33

100mm or more

350mm or more

REQUIRED SPACE

400mm or more

Unit: mm

OUTDOOR UNIT

MUH-A07YV - MUH-A09YV - MUH-A12YV - E1E1E1

OB331-1.qxp 03.12.3 1:20 PM Page 7

REFRIGERANT SYSTEM DIAGRAM

Unit:mm

MUH-A12YV - E1

OUTDOOR UNIT (with heat insulator)

(with heat insulator)

Refrigerant pipe [12.7 4-way valve

Stop valve

(with service port)

Strainer

#100

Refrigerant pipe [6.35

Stop valve

Capillary tube

[3.0x[1.6x1050

Check

valve

Refrigerant flow in cooling

Refrigerant flow in heating

Defrost

thermistor

RT61

Outdoor

heat

exchanger

Capillary tube

[3.0x[1.6x600

Flared connection

Compressor

R.V. coil

heating ON

cooling OFF

MUH-A07YV -

MUH-A09YV - E1

OUTDOOR UNIT

(with heat insulator)

Refrigerant pipe [9.52 4-way valve

Defrost

thermistor

RT61

Muffler

Outdoor

heat

exchanger

Capillary tube

[3.0x[1.4x800(2 pcs)

(MUH-A07YV)

[3.0x[1.4x500(2 pcs)

(MUH-A09YV)

Capillary tube

[3.0x[1.4x500(MUH-A07YV)

[3.0x[1.4x600(MUH-A09YV)

Capillary tube

[3.0x[1.4x600(MUH-A07YV)

[3.0x[1.4x1000(MUH-A09YV)

Check valve

Strainer

#100

Refrigerant pipe [6.35

(with heat insulator) Refrigerant flow in cooling

Refrigerant flow in heating

Unit:mm

Stop valve

(with service

port)

R.V. coil

heating ON

cooling OFF

Capillary tube

[3.0x[1.4x500(2pcs)

Flared connection

Compressor

Stop valve

Muffler

OB331-1.qxp 03.12.3 1:20 PM Page 8

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

Model Refrigerant piping

Max. length : m

Indoor unit

Gas 0.43

Liquid 0.5

Gas

9.52

12.7

Liquid

6.35

Outdoor unit

Gas 0

Liquid 0

MUH-A07YV - E1

MUH-A09YV - E1

MUH-A12YV - E1

Indoor

unit

w Max. Height

difference 10m

Height difference should be within

10m regardless of which unit,

indoor or outdoor position is high. Outdoor unit

Refrigerant Piping

Max.length

Model Refrigerant piping length (one way)

10m

15m

160

20m

260

MUH-A07YV - E1

MUH-A09YV - E1

MUH-A12YV - E1

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

25m

360

Outdoor unit precharged

620

1000

MAX. HEIGHT DIFFERENCE

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

MAX. REFRIGERANT PIPING LENGTH

PERFORMANCE CURVES

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 pro-

vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(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

MUH-A07YV - MUH-A09YV - MUH-A12YV - E1E1E1

OB331-1.qxp 03.12.3 1:20 PM Page 9

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

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

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

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 OUTDOOR UNIT

Wet-and dry-bulb

thermometers Wet-and dry-bulb

thermometers

8-1.CAPACITY AND THE INPUT CURVES

OB331-1.qxp 03.12.3 1:20 PM Page 10

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