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

SERVICE MANUAL

HFC

utilized

R410A

SPLIT-TYPE, AIR CONDITIONERS

Wireless type
Models

No. OB330

MU-A07YV ­MU-A09YV ­MU-A12YV -

Indication of
model name

MU-A07YV ­MU-A09YV ­MU-A12YV -

E1

E1

E1

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

E1

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

E1

8. PERFORMANCE CURVES······························10

E1

9. TROUBLESHOOTING······································18

10. DISASSEMBLY INSTRUCTIONS·····················21

11. PARTS LIST······················································24

NOTE:

•This manual describes technical data of outdoor units.

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

E1

1

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

0

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non
Non

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

A1

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

2

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

TECHNICAL CHANGES

MU-A07WV- ➔MU-A07YV­MU-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)

E1E1

E1E1

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).

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

2

Conversion chart of refrigerant temperature and 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

No

No

No

Yes

Yes

New

New

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

Wall
thickness

Outside diameter

Pipe

mm

For liquid
For gas

6.35

9.52

12.7

0.8 mm

0.8 mm

0.8 mm

Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm

Insulation material

(MPa [Gauge])

4.0

3.5

3.0

2.5

2.0

1.5

R410A
R22

NOTE : The unit of pressure has been changed to MPa on the

international system of units(SI unit system).

1.0

0.5

Saturated liquid pressure

0.0

-0.5

-30 -20 -10 0 10 20

30

40 50 60

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.

2.Refrigerant piping

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.

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

mm

6.35

9.52

12.7

17
22
26

Dimension of flare nut

R22

17
22
24

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.

4

2

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)

kW

R/h

K /h

A
A

W

A(kW)

%

A
A
A

W

"

"

mm

kg

dB

rpm

kg
cc

MU-A07YV -

E1

Single phase

230V,50Hz

10

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

1

0.60

350 (NEO22 )

2.3

0.9

1,686

3.00
680

–
98
23

3.22

MU-A09YV -

E1

Single phase

230V,50Hz

10

RN099VHSHT

700
C-R 3.40
C-S 4.56

RC6V20-AC

WHT-BLK 410

BLK-RED 433
780o540o255

34
45

735

1

0.60

350 (NEO22 )

2.55

1.1

1,686

3.32
760

–
99
24

3.10

0.22

3.21

MU-A12YV -

E1

Single phase

230V,50Hz

1.7

1,914

10

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

1

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

PART NAMES AND FUNCTIONS

OUTDOOR UNIT

MU-A07YV ­MU-A09YV ­MU-A12YV -

3

SPECIFICATION

E1

E1

E1

NOTE: Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C

Outdoor DB35°C WB24°C

Indoor-Outdoor piping length 5m

5

4

90

80

70

60

50

40

30

20

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:

MU-A12YV- E1

COOL

FUNCTION

49

SPL(dB(A)) LINE

OUTDOORUNIT

MICROPHONE

1m

90

80

70

60

50

40

30

20

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 : DB27: WB19:

MU-A07YV- E1
MU-A09YV- E1

COOL

FUNCTION

45

SPL(dB(A)) LINE

NOISE CRITERIA CURVES

6

5

OUTLINES AND DIMENSIONS

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

OUTDOOR UNIT

Air in

320

32

109

Air in

147

122

110

Air out

500
780

74

Drainage
3holes [33

540

260

10

40

E1E1E1

255

REQUIRED SPACE

100mm or more

320

285

25

155

90

400mm or more

Service panel

104

Unit: mm

100mm or more

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

)

)

6

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

2

1

TB1

L

N

PE

GRN/YLW

SYMBOL

MC

MF

E1E1E1

WHT

52C

BLK

BRN

BRN

BLU

52C

COM

NO

COMPRESSOR(INNER PROTECTOR)
OUTDOOR FAN MOTOR

(INNER FUSE/INNER PROTECTOR)

WHT
WHT

NAME NAME

7

DSAR

C2

C1

RED
BLK

WHT

1

BLU

2

RED

3

SYMBOL
TB1,TB2

52C

C

MC

S

WHT

BLK

RED

TERMINAL BLOCK
COMPRESSOR CONTACTOR

R

MF

7

REFRIGERANT SYSTEM DIAGRAM

MU-A07YV ­MU-A09YV -

E1

E1

OUTDOOR UNIT

Flared connection

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 -

E1

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

8

MAX. REFRIGERANT PIPING LENGTH

Refrigerant piping

Model

MU-A07YV - E1
MU-A09YV - E1

MU-A12YV - E1

Max. length : m

MAX. HEIGHT DIFFERENCE

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

A

20

25

Indoor
unit

w Max. Height
difference 10m

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

Gas

9.52

Liquid

Indoor unit

Gas 0.43

Outdoor unit

Gas 0

6.35
Liquid 0.5

Liquid 0

12.7

Refrigerant Piping

Max.length

A

Outdoor unit

ADDITIONAL REFRIGERANT CHARGE(R410A : g)

Model

MU-A07YV - E1
MU-A09YV - E1

MU-A12YV - E1

Outdoor unit precharged

600

750

7m

0

Refrigerant piping length (one way)

10m

60

15m

160

20m

260

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

25m

360

9