Mitsubishi MUZ-A09YV-E1, MUZ-A12YV-E1, MUZ-A09YVH-E1, MUZ-A12YVH-E1 Service Manual

SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

HFC

utilized

R410A

Wireless type
Models

Revision A:

● MUZ-A12YV- and MUZ-A12YVH-
can be connected to MCFZ-A12WV- .

● Some mistakes were corrected.

Please void OB328.

No. OB328

REVISED EDITION-A

E1E1

E1

MUZ-A09YV ­MUZ-A12YV -

E1

E1

MUZ-A09YVH ­MUZ-A12YVH -

Indication of
model name

MUZ-A09YV ­MUZ-A12YV ­MUZ-A09YVH ­MUZ-A12YVH -

E1

E1

CONTENTS

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

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

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

4. NOISE CRITERIA CURVES·······························7

5. OUTLINES AND DIMENSIONS·························8

E1

E1

E1

E1

6. WIRING DIAGRAM ············································9

7. REFRIGERANT SYSTEM DIAGRAM··············11

8. PERFORMANCE CURVES······························12

9. ACTUA TOR CONTROL····································21

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

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

12. DISASSEMBLY INSTRUCTIONS·····················34

13. PARTS LIST······················································38

NOTE:

This service manual describes technical data of the outdoor units.

•As for indoor units MSZ-A09YV- and MSZ-A12YV- , refer to the service manual OB327.

•As for indoor unit MCFZ-A12WV- , refer to the service manual OB344.

E1

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
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

Revision A:

•MUZ-A12YV- and MUZ-A12YVH- can be connected to MCFZ-A12WV- .

•Some mistakes were corrected.

E1E1E1

1

TECHNICAL CHANGES

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 air
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

PART NAMES AND FUNCTIONS

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

OUTDOOR UNIT

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

3

Capacity

Electrical

Coefficient of performance(C.O.P)

Compressor

Fan

Special

NOTE : Test conditions are based on ISO 5151

SPECIFICATION

MUZ-A09YV -

Outdoor model

Function

Power supply

Capacity Rated frequency(Min.~Max.)
Dehumidification
Air flow
Starting current ✽1
Compressor motor current ✽1
Fan motor current

data

kW

r/h

K /h

A
A
A

✽1
Model
Output
Winding
resistance(at 20:)

W

"

Model
Winding

motor

resistance(at 20:)
Dimensions WOHOD
Weight
Sound level
Fan speed

"

mm

kg

dB(A)

rpm
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigerating oil (Model)

remarks

Thermistor RT61

(at 0:)
Thermistor RT62(at 100:)
Thermistor RT64(at 50:)
Thermistor RT65(at 25:)

kg

cc
k"
k"
k"
k"

Cooling : Indoor DB 27: WB 19:

Outdoor DB 35: WB(24:)

Heating : Indoor DB 20: WB 15:

Outdoor DB 7: WB 6:

Refrigerant piping length (one way): 5m

✽1 Measured under rated operating frequency

MUZ-A09YVH -

MSZ-A09YV -

Cooling

2.5 (0.9-3.2)

2.89

3.73

U-V 1.53 U-W 1.53

E1E1

E1E1

Indoor model

Heating

Single phase

230V,50Hz

3.2 (0.9-5.0)

1.4
1900

3.90

0.24

KNB073FBVH

550

V-W 1.53

RA6V21-AA
WHT-BLK 347
BLK-RED 281

800o550o285

33
46

825

1

0.80

320 (NEO22)

32.6

13.4
17
10

ACCESSORIES

OUTDOOR UNIT

Drain socket

1

E1

E1

—

3.49

3.81

E1

MUZ-A12YV ­MUZ-A12YVH -

MSZ-A12YV -

Cooling

Single phase

230V,50Hz

3.5 (1.0-4.1)

2.0

3.21
KNB092FAAH

U-V 0.49 U-W 0.49

RA6V21-AA
WHT-BLK 347
BLK-RED 281

800o550o285

47

320 (NEO22)

Indoor model

Heating

4.0 (0.9-6.0)

1900

5.00

4.57

0.24

3.70

650

V-W 0.49

34

48

825

1

0.90

32.6

13.4
17
10

—

MUZ-A09YV ­MUZ-A12YV -

E1
E1

1

E1

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor model

E1

MCFZ-A12WV -

Cooling

E1

Heating

Single phase

230V,50Hz

3.5 (1.0-4.1)

2.0

3.9 (0.9-5.9)
—

1900

5.00

4.46

0.24

3.21

3.61

KNB092FAAH

650

U-V 0.49 U-W 0.49

V-W 0.49

RA6V21-AA
WHT-BLK 347
BLK-RED 281

800o550o285

34

47

48

825

1

0.90

320 (NEO22)

32.6

13.4
17
10

5

OUTDOOR UNIT

Model

Item

Current transformer
Current transformer
Smoothing capacitor
Outdoor fan capacitor
Diode module
Fuse
Fuse
Defrost heater
Power transistor module
Expansion valve coil
Reactor
Current-detecting resistor
Current-detecting resistor
Current-limiting resistor
Solid state relay
Terminal block
Relay
Relay
Relay
R.V. coil
Heater protector
Outdoor fan motor thermal fuse

MUZ-A09YV -

E1

(CT)

(CT761, CT781)

(

C62A, C62B, C61B

)

(C65)

(DB61, DB65)

(F61)

(F71, F801)

(H)
(IPM)
(LEV)

(L61)

(R61)

(R831)

(

R64A, R64B

)

(SR61)

(TB)
(X63)
(X64)
(X66)

(21S4)

(26H)

MUZ-A09YVH -

E1

MUZ-A12YV -

E1

MUZ-A12YVH -

E1

ETQ19Z53AY
ETQ19Z71AY

680+ 420V

1.8+ 440V
D25XB60

250V 20A

250V 3.15A

PS21244A

CAD-MD12ME 12VDC

10A 23.0mH

25m" 5W

5.1" 10W
G3MB

3P

G5N-1a/G5NB-1a

G4A-1A-PS

LD30013

Open 152:

—

—

—

230V 130W

G5N-1a/G5NB-1a

Open 45:

—

—

—

230V 130W

G5N-1a/G5NB-1a

Open 45:

45m" 5W 50m" 5W (2 elements)

Specifications and rating conditions of main electric parts

6

4

90

80

70

60

50

40

30

20

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

Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)

APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

COOLING

FUNCTION

SPL(dB(A)) LINE

High

SPEED

HEATING

46
46

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

NOISE CRITERIA CURVES

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

MUZ-A12YV ­MUZ-A12YVH -

Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)

Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

10

63 125 250 500 1000 2000 4000 8000

E1

E1

FAN SPEED

High

BAND CENTER FREQUENCIES, Hz

FUNCTION

COOLING
HEATING

SPL(dB(A))

LINE

47

48

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

OUTDOORUNIT

1m

MICROPHONE

7

5

10

69

800

302.5
500 Bolt pitch for installation

150

22.3

Handle

550

280

164.5

99.5

170.5

23

Service panel

Service port

285

344.5

44

400

Air in

Air out

Air in

17.5

Bolt pitch for

installation

304~325

40

Liquid refrigerant pipe joint
Refrigerant pipe (flared) [6.35

Gas refrigerant pipe joint
Refrigerant pipe (flared) [9.52

43-

35-

2 holes 10o21

Drain hole [33 (MUZ-A09/A12YVH)

Drain hole [42 (MUZ-A09/A12YV)

REQUIRED SPACE

Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.

350mm or more

200mm or more

100mm or more

100mm or more

Open two sides of left,
right, or rear side.

OUTLINES AND DIMENSIONS

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

OUTDOOR UNIT

E1E1

E1E1

Unit: mm

8

6

WIRING DIAGRAM

MUZ-A09YV ­MUZ-A12YV -

OUTDOOR UNIT

E1

E1

MODELS WIRING DIAGRAM

RED

2

RED

V

F801

MC

3

N

C61B

C62B

C62A

CN61

LD-W

W

R61

V

WHT

C

CT781

IPM

T801

6

N

LEV

724

IC801

CN642

INVERTER P.C. BOARD

TR821

R831

CN641

CN643

BLK

U

1

BLK

LD-U

U

P

W

WHT

LD-V

CT761

+++

421
3

2
112

the indoor unit electric wiring diagram for

servicing.

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

3. Symbols below indicate.

/: Terminal block, : Connector

NOTE:1. About the indoor side electric wiring refer to

RT64

RT61RT62

NAME

RT65

BLK

L61

BLK

DB61

TAB63

R64B
R64A

L63

L62

TAB61

WHT

F61

WHT

TB

2

230V~

BLU

N

LD70

X64

TAB62

BLU

RED

3

12V

LD69

BLK

BLU

BLU

4

X63

3

F71

CT

DSA

NR61

GRN

GRN/YLW

21S4

2

1

LDE

DB65

123

1

CN721

C65

SR61

CN800

MF

3

2

213

CN601

725

C

N

7

726

C

N

CN771

POWER P.C. BOARD

AMBIENT TEMPERA TURE THERMIST OR

CURRENT-DETECTING RESISTOR

CURRENT-LIMITING RESISTOR

SYMBOL

RT65

R61,R831

R64A,R64B

NAME

EXPANSION VALVE COIL

REACTOR

CMC COIL

SYMBOL

LEV

L61

L62,L63MCMF

NAME

CURRENT TRANSFORMER

SMOOTHING CAPACITOR

OUTDOOR FAN CAPACITOR

SOLID STATE RELAY

TERMINAL BLOCK

SWITCHING POWER TRANSISTOR

TRANSFORMER

RELAY

SR61TBTR821

COMPRESSOR

DIODE MODULE

T801

X63,X64

OUTDOOR FAN MOTOR (INNER FUSE)

VARISTOR

DEFROST THERMISTOR

DISCHARGE TEMPERATURE THERMIST OR

NR61

RT61

RT62

SURGE ABSORBER

FUSE (20A)

FUSE (3.15A)

INTELLIGENT POWER DEVICE

R.V. COIL

21S4

FIN TEMPERATURE THERMIST OR

RT64

POWER TRANSISTOR MODULE

TO

INDOOR

UNIT

CONNEC-

TING

SYMBOL

CT,CT761,CT781

C62A,C62B,C61B

C65

DB61,DB65

DSA

F61

F71,F801

IC801

IPM

9

MUZ-A09YVH ­MUZ-A12YVH -

E1

MODELS WIRING DIAGRAM

E1

U

V

OUTDOOR UNIT

BLK

L61

BLK

BLK

BLK

LD-U

U

P

DB61

TAB63

R64B
R64A

W

RED

2

1

WHT

LD-V

CT761

V

F801

+++

MC

3

RED

N

C61B

C62B

C62A

LD70

X64

CN61

LD-W

W

R61

BLU

4

WHT

C

CT781

IPM

T801

LD69

BLK

BLU

3

6

N

X63

LEV

724

IC801

1

TR821

123

21S4

2

CN721

21

CN642

4
3

INVERTER P.C. BOARD

CN641

12

2

DB65

1

R831

CN800

MF

2

3

C

CN643

21
3

CN601

725

N

7

726

C

N

1

RT65 RT61RT62 RT64

CN771

C65

the indoor unit electric wiring diagram for

servicing.

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

3. Symbols below indicate.

/: Terminal block, : Connector

NOTE:1. About the indoor side electric wiring refer to

NAME

CURRENT-DETECTING RESISTOR

CURRENT-LIMITING RESISTOR

SOLID STATE RELAY

TERMINAL BLOCK

SWITCHING POWER TRANSISTOR

TRANSFORMER

RELAY

R.V. COIL

HEATER PROTECTOR

SYMBOL

R61,R831

R64A,R64B

SR61TBTR821

T801

X63,X64,X66

21S4

26H

NAME

L63

L62

TAB61

WHT

F61

WHT

TB

2

230V~

TO

TAB62

BLU

RED

N

3

12V

INDOOR

UNIT

CT

DSA

GRN/YLW

CONNEC-

TING

F71

NR61

GRN

BLU

LDE

SR61

X66

RED

1

BLKBLK

BLK BLK

2

321

YLW

26H

POWER P.C. BOARD

CN722

BLK

2

1

BLK

BLK

H

10

EXPANSION VALVE COIL

REACTOR

CMC COIL

SYMBOL

LEV

L61

L62,L63MCMF

NAME

CURRENT TRANSFORMER

SMOOTHING CAPACITOR

OUTDOOR FAN CAPACITOR

SYMBOL

CT,CT761,CT781

C62A,C62B,C61B

C65

OUTDOOR FAN MOTOR (INNER FUSE)

VARISTOR

DEFROST THERMISTOR

COMPRESSOR

DIODE MODULE

SURGE ABSORBER

DB61,DB65

DSA

DISCHARGE TEMPERATURE THERMIST OR

NR61

RT61

RT62

FUSE (20A)

FUSE (3.15A)

DEFROST HEATER

F61

F71,F801HIC801

FIN TEMPERATURE THERMIST OR

AMBIENT TEMPERA TURE THERMIST OR

RT64

RT65

INTELLIGENT POWER DEVICE

POWER TRANSISTOR MODULE

IPM

7

Outdoor
heat
exchanger

Flared connection

Defrost
thermistor
RT61

Ambient
Temperature
Thermistor
RT65

Discharge
temperatuer
thermistor
RT62

Flared connection

Stop valve
(with strainer)

Stop valve
(with service port)

Refrigerant flow in cooling

Compressor

Muffler

4-way valve

Refrigerant flow in heating

Refrigerant pipe [9.52
(with heat insulator)

Refrigerant pipe
[6.35
(with heat insulator)

R.V. coil
heating ON
cooling OFF

Strainer

Capillary tube
[3.0✕[2.0✕200

Expansion
valve

Muffler

Muffler

Refrigerant piping

Max. length : m

A

20

Indoor unit

Gas 0.43

Liquid 0.5

Gas

9.52

Liquid

6.35

Outdoor unit

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

Model

MUZ-A09YV -

E1

MUZ-A09YVH -

E1

MUZ-A12YV -

E1

MUZ-A12YVH -

E1

REFRIGERANT SYSTEM DIAGRAM

MUZ-A09YV ­MUZ-A09YVH ­MUZ-A12YV ­MUZ-A12YVH -

OUTDOOR UNIT

E1

E1

E1

E1

Unit:mm

MAX. REFRIGERANT PIPING LENGTH

MAX. HEIGHT DIFFERENCE

Indoor
unit

w Max. Height

difference 12m

Refrigerant Piping
Max. length
A

Outdoor unit

w Height difference should be within 12m regardless of which unit, indoor or outdoor position is high.

11

ADDITIONAL REFRIGERANT CHARGE (R410A:g)

Outdoor unit

precharged

800

900

14m

270

270

7m

0

0

6m

0

0

5m

0

0

11m

180

180

Model

Refrigerant piping length (one way)

Calculation : Xg=30g/mo(Refrigerant piping length(m) - 5)

8m

90

90

9m

120

120

10m

150

150

12m

210

210

13m

240

240

15m

300

300

20m

450

450

MUZ-A09YV - E1
MUZ-A09YVH -

E1

MUZ-A12YV - E1
MUZ-A12YVH - E1

PERFORMANCE CURVES8

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

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.

(1) GUARANTEED VOLTAGE

198 ~ 264V, 50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature : °C WB
(2) Indoor outlet air wet-bulb temperature : °C WB
(3) Outdoor intake air dry-bulb temperature : °C DB
(4) Total input: W
(5) Indoor intake air dry-bulb temperature : °C DB
(6) Outdoor intake air wet-bulb temperature : °C WB
(7) 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.

E1E1

E1E1

Cooling

}

Heating

}

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.

12

INDOOR UNIT

OUTDOOR UNIT

MSZ type MCFZ type

Air out

Air in

Wet and dry-bulb
thermometers

7.3

6.8

6.3

5.7

5.2

difference (degree)

4.7

Indoor air Wet-bulb temperature

8.2

7.6

7.0

6.4

5.8

5.3

8.7

8.0

7.3

6.6

5.9

5.3

Indoor intake air Wet-bulb temperature (:)

Outdoor intake air Dry-bulb temperature (:)

Wet and dry-bulb
thermometers

Wet and dry-bulb
thermometers

:)

Indoor intake air Wet-bulb temperature (

Outdoor intake air Dry-bulb temperature (:)

MSZ-A09YV - E1

23.1

21.3

19.5

17.8

16.0

14.2

difference (degree)

12.4

10.7

Indoor air Dry-bulb temperature

MSZ-A09YV - E1

MUZ-A09YV - E1

MSZ-A12YV - E1

MUZ-A09YV - E1

MUZ-A09YVH - E1

MUZ-A12YV - E1

MUZ-A09YVH - E1

Rated frequency 57Hz

Rated frequency 75Hz

MUZ-A12YVH - E1

25.4

23.4

21.5

19.5

17.6

15.6

13.7

11.7

MSZ-A12YV - E1

MUZ-A12YV - E1

MUZ-A12YVH - E1

Rated frequency 69Hz

Rated frequency 76Hz

MCFZ-A12WV - E1

MUZ-A12YV - E1

MUZ-A12YVH - E1

Rated frequency 69Hz

19.6

18.1

16.6

15.1

13.6

12.1

10.6

9.1

MUZ-A12YV - E1

MCFZ-A12WV - E1

MUZ-A12YVH - E1

Rated frequency 76Hz

:)

Indoor intake air Dry-bulb temperature (:)

Indoor intake air Dry-bulb temperature (

Outdoor intake air Wet-bulb temperature (:)

Outdoor intake air Wet-bulb temperature (:)

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

13

Correction of Cooling total input

Input correction factors

The operational frequency of compressor

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

Correction of Cooling capacity

Capacity correction factors

The operational frequency of compressor

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

Correction of Cooling capacity

Capacity correction factors

The operational frequency of compressor

Correction of Cooling total input

Input correction factors

The operational frequency of compressor

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

Correction of Heating total input

The operational frequency of compressor

0 50 100 150(Hz)

2.0

1.5

1.0

0.5

0.0

2.0

1.5

1.0

0.5

0.0

2.0

1.5

1.0

0.5

0.0

2.0

1.5

1.0

0.5

0.0

0 50 100 150(Hz)

Correction of Heating capacity

Capacity correction factors

The operational frequency of compressor

Correction of Heating total input

Input correction factors

The operational frequency of compressor

0 50 100 150(Hz)

0 50 100 150(Hz)

Correction of Heating capacity

Capacity correction factors

The operational frequency of compressor

Input correction factors

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

Correction of Cooling capacity

Capacity correction factors

The operational frequency of compressor

Correction of Cooling total input

Input correction factors

The operational frequency of compressor

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

1.5

1.0

0.5

0.0

2.0

1.5

1.0

0.5

0.0

Correction of

Heating total input

Input correction factors

The operational frequency of compressor

0 50 100 150(Hz)

0 50 100 150(Hz)

Correction of Heating capacity

Capacity correction factors

The operational frequency of compressor

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MSZ-A12YV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MSZ-A12YV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MSZ-A12YV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MSZ-A12YV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MCFZ-A12WV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MCFZ-A12WV -

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MCFZ-A12WV -

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

E1E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MCFZ-A12WV -

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

E1

( )

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

<How to operate fixed-frequency operation (Test run operation)>

1. Press the EMERGENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice).

2. Test run operation starts and continue to operate for 30 minutes.

3. Compressor operates at rated frequency in COOL mode or 58Hz in HEAT mode.

4. Indoor fan operates at High speed.

5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor
varies).

6. To cancel test run operation (EMERGENCY OPERATION), press the EMERGENCY OPERATION switch or any button on
remote controller.

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])

14

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

18 32

15 2050256030

70 (%)

35(˚C)

0.2

0.4

0.6

0.8

1.0

1.2
57Hz

2

4

6

8

10

12

14

1.4

Ambient temperature(˚C) Ambient humidity(%)

Outdoor low pressure

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

15 2050256030

70 (%)

35(˚C)

2

2.5

3

3.5

4

57Hz

32

18

Outdoor unit current(A)

Ambient temperature(˚C) Ambient humidity(%)

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

Ambient temperature(˚C) Ambient humidity(%)

Ambient temperature(˚C) Ambient humidity(%)

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

Ambient temperature(˚C) Ambient humidity(%)

Ambient temperature(˚C) Ambient humidity(%)

18 32

15 2050256030

70 (%)

35(˚C)

0.2

0.4

0.6

0.8

1.0

1.2

69Hz

1.4

15 205025

60

30
70 (%)

35(˚C)

2

3

4

5

6

69Hz

32

18

Outdoor low pressure

Outdoor unit current(A)

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

2

4

6

8

10

12

14

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MSZ-A12YV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MSZ-A12YV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

18 32

15 2050256030

70 (%)

35(˚C)

0.2

0.4

0.6

0.8

1.0

1.2

69Hz

1.4

15 205025

60

30
70 (%)

35(˚C)

2

3

4

5

6

69Hz

32

18

Outdoor low pressure

Outdoor unit current(A)

2

4

6

8

10

12

14

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MCFZ-A12WV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MCFZ-A12WV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT

Outdoor unit current (A)

Outdoor unit current (A)

Ambient temperature(˚C)

Ambient temperature(˚C)

MUZ-A09YV ­MUZ-A09YVH -

E1

E1

Outdoor unit current (A)

Ambient temperature(˚C)

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MSZ-A12YV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

Indoor unit :
MCFZ-A12WV -

E1

MUZ-A12YV ­MUZ-A12YVH -

E1

E1

( )

3.0

2.5

2.0

1.5

1.0

0.5

0.0
2 5 10 15 20 25(:)

58Hz

4.0

3.5

3.0

2.5

2.0

1.5

1.0
2 5 10 15 20 25(:)

58Hz

4.0

3.5

3.0

2.5

2.0

1.5

1.0
2 5 10 15 20 25(:)

58Hz

COOL operation

1 Both indoor and outdoor unit are under the

same temperature/humidity condition.

2 Air flow : High speed
3 Operational frequency : 57Hz(MUZ-A09YV, MUZ-A09YVH)

69Hz(MUZ-A12YV, MUZ-A12YVH)

Dry-bulb temperature

20
25
30 70

Relative humidity(%)

50
60

HEAT operation

Condition indoor: Dry bulb temperature 20.0°C
Condition outdoor: Dry bulb temperature 2,7,15,20.0°C

Wet bulb temperature 14.5°C
Wet bulb temperature 1,6,12,14.5°C

15

PERFORMANCE DATA COOL operation Rated frequency 57Hz

MSZ-A09YV - : MUZ-A09YV - MUZ-A09YVH -

CAPACITY:2.5(kW)

INDOOR INDOOR

DB(:) WB(:)

21 18
21 20
22 18
22 20
22 22
23 18
23 20
23 22
24 18
24 20
24 22
24 24
25 18 2.94 2.26 0.77 536 2.81 2.17 0.77 563 2.70 2.08 0.77 590 2.60 2.00 0.77 616
25 20
25 22
25 24
26 18
26 20
26 22
26 24
26 26
27 18
27 20
27 22
27 24
27 26
28 18
28 20
28 22
28 24
28 26
29 18
29 20
29 22
29 24
29 26
30 18
30 20
30 22
30 24
30 26
31 18
31 20
31 22
31 24
31 26
32 18
32 20
32 22
32 24
32 26

NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUT

2.94 1.79 0.61 536 2.81 1.72 0.61 563 2.70 1.65 0.61 590 2.60 1.59 0.61 616

3.06 1.50 0.49 563 2.94 1.44 0.49 596 2.85 1.40 0.49 610 2.75 1.35 0.49 637

2.94 1.91 0.65 536 2.81 1.83 0.65 563 2.70 1.76 0.65 590 2.60 1.69 0.65 616

3.06 1.62 0.53 563 2.94 1.56 0.53 596 2.85 1.51 0.53 610 2.75 1.46 0.53 637

3.19 1.31 0.41 583 3.08 1.26 0.41 620 3.00 1.23 0.41 637 2.88 1.18 0.41 663

2.94 2.03 0.69 536 2.81 1.94 0.69 563 2.70 1.86 0.69 590 2.60 1.79 0.69 616

3.06 1.75 0.57 563 2.94 1.67 0.57 596 2.85 1.62 0.57 610 2.75 1.57 0.57 637

3.19 1.43 0.45 583 3.08 1.38 0.45 620 3.00 1.35 0.45 637 2.88 1.29 0.45 663

2.94 2.14 0.73 536 2.81 2.05 0.73 563 2.70 1.97 0.73 590 2.60 1.90 0.73 616

3.06 1.87 0.61 563 2.94 1.79 0.61 596 2.85 1.74 0.61 610 2.75 1.68 0.61 637

3.19 1.56 0.49 583 3.08 1.51 0.49 620 3.00 1.47 0.49 637 2.88 1.41 0.49 663

3.35 1.24 0.37 610 3.23 1.19 0.37 643 3.15 1.17 0.37 663 3.05 1.13 0.37 697

3.06 1.99 0.65 563 2.94 1.91 0.65 596 2.85 1.85 0.65 610 2.75 1.79 0.65 637

3.19 1.69 0.53 583 3.08 1.63 0.53 620 3.00 1.59 0.53 637 2.88 1.52 0.53 663

3.35 1.37 0.41 610 3.23 1.32 0.41 643 3.15 1.29 0.41 663 3.05 1.25 0.41 697

2.94 2.38 0.81 536 2.81 2.28 0.81 563 2.70 2.19 0.81 590 2.60 2.11 0.81 616

3.06 2.11 0.69 563 2.94 2.03 0.69 596 2.85 1.97 0.69 610 2.75 1.90 0.69 637

3.19 1.82 0.57 583 3.08 1.75 0.57 620 3.00 1.71 0.57 637 2.88 1.64 0.57 663

3.35 1.51 0.45 610 3.23 1.45 0.45 643 3.15 1.42 0.45 663 3.05 1.37 0.45 697

3.45 1.14 0.33 643 3.35 1.11 0.33 677 3.30 1.09 0.33 697 3.20 1.06 0.33 717

2.94 2.50 0.85 536 2.81 2.39 0.85 563 2.70 2.30 0.85 590 2.60 2.21 0.85 616

3.06 2.24 0.73 563 2.94 2.14 0.73 596 2.85 2.08 0.73 610 2.75 2.01 0.73 637

3.19 1.94 0.61 583 3.08 1.88 0.61 620 3.00 1.83 0.61 637 2.88 1.75 0.61 663

3.35 1.64 0.49 610 3.23 1.58 0.49 643 3.15 1.54 0.49 663 3.05 1.49 0.49 697

3.45 1.28 0.37 643 3.35 1.24 0.37 677 3.30 1.22 0.37 697 3.20 1.18 0.37 717

2.94 2.61 0.89 536 2.81 2.50 0.89 563 2.70 2.40 0.89 590 2.60 2.31 0.89 616

3.06 2.36 0.77 563 2.94 2.26 0.77 596 2.85 2.19 0.77 610 2.75 2.12 0.77 637

3.19 2.07 0.65 583 3.08 2.00 0.65 620 3.00 1.95 0.65 637 2.88 1.87 0.65 663

3.35 1.78 0.53 610 3.23 1.71 0.53 643 3.15 1.67 0.53 663 3.05 1.62 0.53 697

3.45 1.41 0.41 643 3.35 1.37 0.41 677 3.30 1.35 0.41 697 3.20 1.31 0.41 717

2.94 2.73 0.93 536 2.81 2.62 0.93 563 2.70 2.51 0.93 590 2.60 2.42 0.93 616

3.06 2.48 0.81 563 2.94 2.38 0.81 596 2.85 2.31 0.81 610 2.75 2.23 0.81 637

3.19 2.20 0.69 583 3.08 2.12 0.69 620 3.00 2.07 0.69 637 2.88 1.98 0.69 663

3.35 1.91 0.57 610 3.23 1.84 0.57 643 3.15 1.80 0.57 663 3.05 1.74 0.57 697

3.45 1.55 0.45 643 3.35 1.51 0.45 677 3.30 1.49 0.45 697 3.20 1.44 0.45 717

2.94 2.85 0.97 536 2.81 2.73 0.97 563 2.70 2.62 0.97 590 2.60 2.52 0.97 616

3.06 2.60 0.85 563 2.94 2.50 0.85 596 2.85 2.42 0.85 610 2.75 2.34 0.85 637

3.19 2.33 0.73 583 3.08 2.24 0.73 620 3.00 2.19 0.73 637 2.88 2.10 0.73 663

3.35 2.04 0.61 610 3.23 1.97 0.61 643 3.15 1.92 0.61 663 3.05 1.86 0.61 697

3.45 1.69 0.49 643 3.35 1.64 0.49 677 3.30 1.62 0.49 697 3.20 1.57 0.49 717

2.94 2.97 1.01 536 2.81 2.84 1.01 563 2.70 2.73 1.01 590 2.60 2.63 1.01 616

3.06 2.73 0.89 563 2.94 2.61 0.89 596 2.85 2.54 0.89 610 2.75 2.45 0.89 637

3.19 2.45 0.77 583 3.08 2.37 0.77 620 3.00 2.31 0.77 637 2.88 2.21 0.77 663

3.35 2.18 0.65 610 3.23 2.10 0.65 643 3.15 2.05 0.65 663 3.05 1.98 0.65 697

3.45 1.83 0.53 643 3.35 1.78 0.53 677 3.30 1.75 0.53 697 3.20 1.70 0.53 717

2.94 3.08 1.05 536 2.81 2.95 1.05 563 2.70 2.84 1.05 590 2.60 2.73 1.05 616

3.06 2.85 0.93 563 2.94 2.73 0.93 596 2.85 2.65 0.93 610 2.75 2.56 0.93 637

3.19 2.58 0.81 583 3.08 2.49 0.81 620 3.00 2.43 0.81 637 2.88 2.33 0.81 663

3.35 2.31 0.69 610 3.23 2.23 0.69 643 3.15 2.17 0.69 663 3.05 2.10 0.69 697

3.45 1.97 0.57 643 3.35 1.91 0.57 677 3.30 1.88 0.57 697 3.20 1.82 0.57 717

21

INPUT:670(W)SHF:0.79

OUTDOOR DB(:)

25 27 30

E1E1E1

16

PERFORMANCE DATA COOL operation Rated frequency 57Hz

MSZ-A09YV - : MUZ-A09YV - MUZ-A09YVH -

CAPACITY:2.5(kW)

INDOOR INDOOR

DB (:) WB (:)

21 18
21 20
22 18
22 20
22 22
23 18
23 20
23 22
24 18
24 20
24 22
24 24
25
25
25 22
25 24
26 18
26 20
26 22
26 24
26 26
27 18
27 20
27 22
27 24
27 26
28 18
28 20
28 22
28 24
28 26
29 18
29 20
29 22
29 24
29 26
30 18
30 20
30 22
30 24
30 26
31 18
31 20
31 22
31 24
31 26
32 18
32 20
32 22
32 24
32 26

NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

18
20

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT

2.45 1.49 0.61 657 2.25 1.37 0.61 697 2.08 1.27 0.61 724

2.58 1.26 0.49 683 2.40 1.18 0.49 717 2.23 1.09 0.49 757

2.45 1.59 0.65 657 2.25 1.46 0.65 697 2.08 1.35 0.65 724

2.58 1.36 0.53 683 2.40 1.27 0.53 717 2.23 1.18 0.53 757

2.73 1.12 0.41 710 2.55 1.05 0.41 750 2.38 0.97 0.41 777

2.45 1.69 0.69 657 2.25 1.55 0.69 697 2.08 1.43 0.69 724

2.58 1.47 0.57 683 2.40 1.37 0.57 717 2.23 1.27 0.57 757

2.73 1.23 0.45 710 2.55 1.15 0.45 750 2.38 1.07 0.45 777

2.45 1.79 0.73 657 2.25 1.64 0.73 697 2.08 1.51 0.73 724

2.58 1.57 0.61 683 2.40 1.46 0.61 717 2.23 1.36 0.61 757

2.73 1.34 0.49 710 2.55 1.25 0.49 750 2.38 1.16 0.49 777

2.88 1.06 0.37 737 2.70 1.00 0.37 771 2.55 0.94 0.37 804

2.45 1.89 0.77 657 2.25 1.73 0.77 697 2.08 1.60 0.77 724

2.58 1.67 0.65 683 2.40 1.56 0.65 717 2.23 1.45 0.65 757

2.73 1.44 0.53 710 2.55 1.35 0.53 750 2.38 1.26 0.53 777

2.88 1.18 0.41 737 2.70 1.11 0.41 771 2.55 1.05 0.41 804

2.45 1.98 0.81 657 2.25 1.82 0.81 697 2.08 1.68 0.81 724

2.58 1.78 0.69 683 2.40 1.66 0.69 717 2.23 1.54 0.69 757

2.73 1.55 0.57 710 2.55 1.45 0.57 750 2.38 1.35 0.57 777

2.88 1.29 0.45 737 2.70 1.22 0.45 771 2.55 1.15 0.45 804

3.03 1.00 0.33 764 2.85 0.94 0.33 797 2.68 0.88 0.33 831

2.45 2.08 0.85 657 2.25 1.91 0.85 697 2.08 1.76 0.85 724

2.58 1.88 0.73 683 2.40 1.75 0.73 717 2.23 1.62 0.73 757

2.73 1.66 0.61 710 2.55 1.56 0.61 750 2.38 1.45 0.61 777

2.88 1.41 0.49 737 2.70 1.32 0.49 771 2.55 1.25 0.49 804

3.03 1.12 0.37 764 2.85 1.05 0.37 797 2.68 0.99 0.37 831

2.45 2.18 0.89 657 2.25 2.00 0.89 697 2.08 1.85 0.89 724

2.58 1.98 0.77 683 2.40 1.85 0.77 717 2.23 1.71 0.77 757

2.73 1.77 0.65 710 2.55 1.66 0.65 750 2.38 1.54 0.65 777

2.88 1.52 0.53 737 2.70 1.43 0.53 771 2.55 1.35 0.53 804

3.03 1.24 0.41 764 2.85 1.17 0.41 797 2.68 1.10 0.41 831

2.45 2.28 0.93 657 2.25 2.09 0.93 697 2.08 1.93 0.93 724

2.58 2.09 0.81 683 2.40 1.94 0.81 717 2.23 1.80 0.81 757

2.73 1.88 0.69 710 2.55 1.76 0.69 750 2.38 1.64 0.69 777

2.88 1.64 0.57 737 2.70 1.54 0.57 771 2.55 1.45 0.57 804

3.03 1.36 0.45 764 2.85 1.28 0.45 797 2.68 1.20 0.45 831

2.45 2.38 0.97 657 2.25 2.18 0.97 697 2.08 2.01 0.97 724

2.58 2.19 0.85 683 2.40 2.04 0.85 717 2.23 1.89 0.85 757

2.73 1.99 0.73 710 2.55 1.86 0.73 750 2.38 1.73 0.73 777

2.88 1.75 0.61 737 2.70 1.65 0.61 771 2.55 1.56 0.61 804

3.03 1.48 0.49 764 2.85 1.40 0.49 797 2.68 1.31 0.49 831

2.45 2.47 1.01 657 2.25 2.27 1.01 697 2.08 2.10 1.01 724

2.58 2.29 0.89 683 2.40 2.14 0.89 717 2.23 1.98 0.89 757

2.73 2.10 0.77 710 2.55 1.96 0.77 750 2.38 1.83 0.77 777

2.88 1.87 0.65 737 2.70 1.76 0.65 771 2.55 1.66 0.65 804

3.03 1.60 0.53 764 2.85 1.51 0.53 797 2.68 1.42 0.53 831

2.45 2.57 1.05 657 2.25 2.36 1.05 697 2.08 2.18 1.05 724

2.58 2.39 0.93 683 2.40 2.23 0.93 717 2.23 2.07 0.93 757

2.73 2.21 0.81 710 2.55 2.07 0.81 750 2.38 1.92 0.81 777

2.88 1.98 0.69 737 2.70 1.86 0.69 771 2.55 1.76 0.69 804

3.03 1.72 0.57 764 2.85 1.62 0.57 797 2.68 1.52 0.57 831

INPUT:670(W)SHF:0.79

OUTDOOR DB(:)

35 40 46

E1E1E1

17

CAPACITY:3.5(kW)

INPUT:1090(W)

SHF:0.76

21 18
21 20
22 18
22 20
22 22
23 18
23 20
23 22
24 18
24 20
24 22
24 24

25 20
25 22
25 24
26 18
26 20
26 22
26 24
26 26
27 18
27 20
27 22
27 24
27 26
28 18
28 20
28 22
28 24
28 26
29 18
29 20
29 22
29 24
29 26
30 18
30 20
30 22
30 24
30 26
31 18
31 20
31 22
31 24
31 26
32 18
32 20
32 22
32 24
32 26

INDOOR INDOOR

21

OUTDOOR DB(:)

25 27 30

DB(:) WB(:)

Q SHC SHF Q SHC SHF Q SHC SHF Q SHC SHFINPUT INPUT INPUT INPUT

4.11 2.39 0.58 872 3.94 2.28 0.58 916 3.78 2.19 0.58 959 3.64 2.11 0.58 1003

4.29 1.97 0.46 916 4.11 1.89 0.46 970 3.99 1.84 0.46 992 3.85 1.77 0.46 1036

4.11 2.55 0.62 872 3.94 2.44 0.62 916 3.78 2.34 0.62 959 3.64 2.26 0.62 1003

4.29 2.14 0.50 916 4.11 2.06 0.50 970 3.99 2.00 0.50 992 3.85 1.93 0.50 1036

4.46 1.70 0.38 948 4.31 1.64 0.38 1008 4.20 1.60 0.38 1036 4.03 1.53 0.38 1079

4.11 2.71 0.66 872 3.94 2.60 0.66 916 3.78 2.49 0.66 959 3.64 2.40 0.66 1003

4.29 2.32 0.54 916 4.11 2.22 0.54 970 3.99 2.15 0.54 992 3.85 2.08 0.54 1036

4.46 1.87 0.42 948 4.31 1.81 0.42 1008 4.20 1.76 0.42 1036 4.03 1.69 0.42 1079

4.11 2.88 0.70 872 3.94 2.76 0.70 916 3.78 2.65 0.70 959 3.64 2.55 0.70 1003

4.29 2.49 0.58 916 4.11 2.39 0.58 970 3.99 2.31 0.58 992 3.85 2.23 0.58 1036

4.46 2.05 0.46 948 4.31 1.98 0.46 1008 4.20 1.93 0.46 1036 4.03 1.85 0.46 1079

4.69 1.59 0.34 992 4.52 1.54 0.34 1046 4.41 1.50 0.34 1079 4.27 1.45 0.34 1134

25 18 4.11 3.04 0.74 872 3.94 2.91 0.74 916 3.78 2.80 0.74 959 3.64 2.69 0.74 1003

4.29 2.66 0.62 916 4.11 2.55 0.62 970 3.99 2.47 0.62 992 3.85 2.39 0.62 1036

4.46 2.23 0.50 948 4.31 2.15 0.50 1008 4.20 2.10 0.50 1036 4.03 2.01 0.50 1079

4.69 1.78 0.38 992 4.52 1.72 0.38 1046 4.41 1.68 0.38 1079 4.27 1.62 0.38 1134

4.11 3.21 0.78 872 3.94 3.07 0.78 916 3.78 2.95 0.78 959 3.64 2.84 0.78 1003

4.29 2.83 0.66 916 4.11 2.71 0.66 970 3.99 2.63 0.66 992 3.85 2.54 0.66 1036

4.46 2.41 0.54 948 4.31 2.32 0.54 1008 4.20 2.27 0.54 1036 4.03 2.17 0.54 1079

4.69 1.97 0.42 992 4.52 1.90 0.42 1046 4.41 1.85 0.42 1079 4.27 1.79 0.42 1134

4.83 1.45 0.30 1046 4.69 1.41 0.30 1101 4.62 1.39 0.30 1134 4.48 1.34 0.30 1166

4.11 3.37 0.82 872 3.94 3.23 0.82 916 3.78 3.10 0.82 959 3.64 2.98 0.82 1003

4.29 3.00 0.70 916 4.11 2.88 0.70 970 3.99 2.79 0.70 992 3.85 2.70 0.70 1036

4.46 2.59 0.58 948 4.31 2.50 0.58 1008 4.20 2.44 0.58 1036 4.03 2.33 0.58 1079

4.69 2.16 0.46 992 4.52 2.08 0.46 1046 4.41 2.03 0.46 1079 4.27 1.96 0.46 1134

4.83 1.64 0.34 1046 4.69 1.59 0.34 1101 4.62 1.57 0.34 1134 4.48 1.52 0.34 1166

4.11 3.54 0.86 872 3.94 3.39 0.86 916 3.78 3.25 0.86 959 3.64 3.13 0.86 1003

4.29 3.17 0.74 916 4.11 3.04 0.74 970 3.99 2.95 0.74 992 3.85 2.85 0.74 1036

4.46 2.77 0.62 948 4.31 2.67 0.62 1008 4.20 2.60 0.62 1036 4.03 2.50 0.62 1079

4.69 2.35 0.50 992 4.52 2.26 0.50 1046 4.41 2.21 0.50 1079 4.27 2.14 0.50 1134

4.83 1.84 0.38 1046 4.69 1.78 0.38 1101 4.62 1.76 0.38 1134 4.48 1.70 0.38 1166

4.11 3.70 0.90 872 3.94 3.54 0.90 916 3.78 3.40 0.90 959 3.64 3.28 0.90 1003

4.29 3.34 0.78 916 4.11 3.21 0.78 970 3.99 3.11 0.78 992 3.85 3.00 0.78 1036

4.46 2.95 0.66 948 4.31 2.84 0.66 1008 4.20 2.77 0.66 1036 4.03 2.66 0.66 1079

4.69 2.53 0.54 992 4.52 2.44 0.54 1046 4.41 2.38 0.54 1079 4.27 2.31 0.54 1134

4.83 2.03 0.42 1046 4.69 1.97 0.42 1101 4.62 1.94 0.42 1134 4.48 1.88 0.42 1166

4.11 3.87 0.94 872 3.94 3.70 0.94 916 3.78 3.55 0.94 959 3.64 3.42 0.94 1003

4.29 3.52 0.82 916 4.11 3.37 0.82 970 3.99 3.27 0.82 992 3.85 3.16 0.82 1036

4.46 3.12 0.70 948 4.31 3.01 0.70 1008 4.20 2.94 0.70 1036 4.03 2.82 0.70 1079

4.69 2.72 0.58 992 4.52 2.62 0.58 1046 4.41 2.56 0.58 1079 4.27 2.48 0.58 1134

4.83 2.22 0.46 1046 4.69 2.16 0.46 1101 4.62 2.13 0.46 1134 4.48 2.06 0.46 1166

4.11 4.03 0.98 872 3.94 3.86 0.98 916 3.78 3.70 0.98 959 3.64 3.57 0.98 1003

4.29 3.69 0.86 916 4.11 3.54 0.86 970 3.99 3.43 0.86 992 3.85 3.31 0.86 1036

4.46 3.30 0.74 948 4.31 3.19 0.74 1008 4.20 3.11 0.74 1036 4.03 2.98 0.74 1079

4.69 2.91 0.62 992 4.52 2.80 0.62 1046 4.41 2.73 0.62 1079 4.27 2.65 0.62 1134

4.83 2.42 0.50 1046 4.69 2.35 0.50 1101 4.62 2.31 0.50 1134 4.48 2.24 0.50 1166

4.11 4.19 1.02 872 3.94 4.02 1.02 916 3.78 3.86 1.02 959 3.64 3.71 1.02 1003

4.29 3.86 0.90 916 4.11 3.70 0.90 970 3.99 3.59 0.90 992 3.85 3.47 0.90 1036

4.46 3.48 0.78 948 4.31 3.36 0.78 1008 4.20 3.28 0.78 1036 4.03 3.14 0.78 1079

4.69 3.10 0.66 992 4.52 2.98 0.66 1046 4.41 2.91 0.66 1079 4.27 2.82 0.66 1134

4.83 2.61 0.54 1046 4.69 2.53 0.54 1101 4.62 2.49 0.54 1134 4.48 2.42 0.54 1166

PERFORMANCE DATA COOL operation Rated frequency 69Hz

MSZ-A12YV - MCFZ-A12WV - : MUZ-A12YV - MUZ-A12YVH -

E1E1E1E1

NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

18

PERFORMANCE DATA COOL operation Rated frequency 69Hz

MSZ-A12YV - MCFZ-A12WV - : MUZ-A12YV - MUZ-A12YVH -

CAPACITY:3.5(kW)

INDOOR INDOOR

DB (:)

NOTE Q : Total capacity (kW) SHF : Sensible heat factor DB : Dry-bulb temperature

WB (:)

21 18
21 20
22 18
22 20
22 22
23 18
23 20
23 22
24 18
24 20
24 22
24 24
25 18 3.43 2.54 0.74 1068 3.15 2.33 0.74 1134 2.91 2.15 0.74 1177
25 20
25 22
25 24
26 18
26 20
26 22
26 24
26 26
27 18
27 20
27 22
27 24
27 26
28 18
28 20
28 22
28 24
28 26
29 18
29 20
29 22
29 24
29 26
30 18
30 20
30 22
30 24
30 26
31 18
31 20
31 22
31 24
31 26
32 18
32 20
32 22
32 24
32 26

SHC : Sensible heat capacity (kW) INPUT : Total power input (W) WB : Wet-bulb temperature

SHF:0.76

Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT

3.43 1.99 0.58 1068 3.15 1.83 0.58 1134 2.91 1.68 0.58 1177

3.61 1.66 0.46 1112 3.36 1.55 0.46 1166 3.12 1.43 0.46 1232

3.43 2.13 0.62 1068 3.15 1.95 0.62 1134 2.91 1.80 0.62 1177

3.61 1.80 0.50 1112 3.36 1.68 0.50 1166 3.12 1.56 0.50 1232

3.82 1.45 0.38 1155 3.57 1.36 0.38 1221 3.33 1.26 0.38 1264

3.43 2.26 0.66 1068 3.15 2.08 0.66 1134 2.91 1.92 0.66 1177

3.61 1.95 0.54 1112 3.36 1.81 0.54 1166 3.12 1.68 0.54 1232

3.82 1.60 0.42 1155 3.57 1.50 0.42 1221 3.33 1.40 0.42 1264

3.43 2.40 0.70 1068 3.15 2.21 0.70 1134 2.91 2.03 0.70 1177

3.61 2.09 0.58 1112 3.36 1.95 0.58 1166 3.12 1.81 0.58 1232

3.82 1.75 0.46 1155 3.57 1.64 0.46 1221 3.33 1.53 0.46 1264

4.03 1.37 0.34 1199 3.78 1.29 0.34 1254 3.57 1.21 0.34 1308

3.61 2.24 0.62 1112 3.36 2.08 0.62 1166 3.12 1.93 0.62 1232

3.82 1.91 0.50 1155 3.57 1.79 0.50 1221 3.33 1.66 0.50 1264

4.03 1.53 0.38 1199 3.78 1.44 0.38 1254 3.57 1.36 0.38 1308

3.43 2.68 0.78 1068 3.15 2.46 0.78 1134 2.91 2.27 0.78 1177

3.61 2.38 0.66 1112 3.36 2.22 0.66 1166 3.12 2.06 0.66 1232

3.82 2.06 0.54 1155 3.57 1.93 0.54 1221 3.33 1.80 0.54 1264

4.03 1.69 0.42 1199 3.78 1.59 0.42 1254 3.57 1.50 0.42 1308

4.24 1.27 0.30 1243 3.99 1.20 0.30 1297 3.75 1.12 0.30 1352

3.43 2.81 0.82 1068 3.15 2.58 0.82 1134 2.91 2.38 0.82 1177

3.61 2.52 0.70 1112 3.36 2.35 0.70 1166 3.12 2.18 0.70 1232

3.82 2.21 0.58 1155 3.57 2.07 0.58 1221 3.33 1.93 0.58 1264

4.03 1.85 0.46 1199 3.78 1.74 0.46 1254 3.57 1.64 0.46 1308

4.24 1.44 0.34 1243 3.99 1.36 0.34 1297 3.75 1.27 0.34 1352

3.43 2.95 0.86 1068 3.15 2.71 0.86 1134 2.91 2.50 0.86 1177

3.61 2.67 0.74 1112 3.36 2.49 0.74 1166 3.12 2.31 0.74 1232

3.82 2.37 0.62 1155 3.57 2.21 0.62 1221 3.33 2.06 0.62 1264

4.03 2.01 0.50 1199 3.78 1.89 0.50 1254 3.57 1.79 0.50 1308

4.24 1.61 0.38 1243 3.99 1.52 0.38 1297 3.75 1.42 0.38 1352

3.43 3.09 0.90 1068 3.15 2.84 0.90 1134 2.91 2.61 0.90 1177

3.61 2.81 0.78 1112 3.36 2.62 0.78 1166 3.12 2.43 0.78 1232

3.82 2.52 0.66 1155 3.57 2.36 0.66 1221 3.33 2.19 0.66 1264

4.03 2.17 0.54 1199 3.78 2.04 0.54 1254 3.57 1.93 0.54 1308

4.24 1.78 0.42 1243 3.99 1.68 0.42 1297 3.75 1.57 0.42 1352

3.43 3.22 0.94 1068 3.15 2.96 0.94 1134 2.91 2.73 0.94 1177

3.61 2.96 0.82 1112 3.36 2.76 0.82 1166 3.12 2.55 0.82 1232

3.82 2.67 0.70 1155 3.57 2.50 0.70 1221 3.33 2.33 0.70 1264

4.03 2.33 0.58 1199 3.78 2.19 0.58 1254 3.57 2.07 0.58 1308

4.24 1.95 0.46 1243 3.99 1.84 0.46 1297 3.75 1.72 0.46 1352

3.43 3.36 0.98 1068 3.15 3.09 0.98 1134 2.91 2.85 0.98 1177

3.61 3.10 0.86 1112 3.36 2.89 0.86 1166 3.12 2.68 0.86 1232

3.82 2.82 0.74 1155 3.57 2.64 0.74 1221 3.33 2.46 0.74 1264

4.03 2.50 0.62 1199 3.78 2.34 0.62 1254 3.57 2.21 0.62 1308

4.24 2.12 0.50 1243 3.99 2.00 0.50 1297 3.75 1.87 0.50 1352

3.43 3.50 1.02 1068 3.15 3.21 1.02 1134 2.91 2.96 1.02 1177

3.61 3.24 0.90 1112 3.36 3.02 0.90 1166 3.12 2.80 0.90 1232

3.82 2.98 0.78 1155 3.57 2.78 0.78 1221 3.33 2.59 0.78 1264

4.03 2.66 0.66 1199 3.78 2.49 0.66 1254 3.57 2.36 0.66 1308

4.24 2.29 0.54 1243 3.99 2.15 0.54 1297 3.75 2.02 0.54 1352

INPUT:1090(W)

OUTDOOR DB(:)

35 40 46

E1E1E1E1

19

PERFORMANCE DATA HEAT operation

CAPACITY:3.2(kW)

INPUT:840(W)

OUTDOOR WB(:)

INDOOR

-10 -5 0 5 10 15 20

DB(:)

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT
15 2.02 546 2.43 655 2.85 739 3.26 798 3.68 848 4.06 874 4.48 890
21 1.92 588 2.30 697 2.72 773 3.10 832 3.52 874 3.90 899 4.30 932
26 1.73 630 2.14 739 2.53 815 2.94 874 3.36 916 3.74 941 4.16 966

CAPACITY:4.0(kW)

INPUT:1080(W)

OUTDOOR WB(:)

INDOOR

-10 -5 0 5 10 15 20

DB(:)

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT
15 2.52 702 3.04 842 3.56 950 4.08 1026 4.60 1091 5.08 1123 5.60 1145
21 2.40 756 2.88 896 3.40 994 3.88 1069 4.40 1123 4.88 1156 5.38 1199
26 2.16 810 2.68 950 3.16 1048 3.68 1123 4.20 1177 4.68 1210 5.20 1242

CAPACITY:3.9(kW)

INPUT:1080(W)

OUTDOOR WB(:)

INDOOR

-10 -5 0 5 10 15 20

DB(:)

Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT
15 2.46 702 2.96 842 3.47 950 3.98 1026 4.49 1091 4.95 1123 5.46 1145
21 2.34 756 2.81 896 3.32 994 3.78 1069 4.29 1123 4.76 1156 5.25 1199
26 2.11 810 2.61 950 3.08 1048 3.59 1123 4.10 1177 4.56 1210 5.07 1242

MSZ-A09YV - : MUZ-A09YV - MUZ-A09YVH - Rated frequency 75Hz

NOTE Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature

MSZ-A12YV - : MUZ-A12YV - MUZ-A12YVH - Rated frequency 76Hz

NOTE Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature

E1E1E1

E1E1E1

MCFZ-A12WV - : MUZ-A12YV - MUZ-A12YVH - Rated frequency 76Hz

NOTE Q:Total capacity (kW) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature

E1E1E1

20

9

ON

OFF

ON

OFF

Outdoor fan
motor

Compressor

5 seconds 15 seconds

ON
OFF

Compressor

Outdoor fan
motor

R.V.coil

ON
OFF

ON
OFF

<COOL>

5 seconds

<HEAT>

5 seconds

ACTUATOR CONTROL

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

E1E1

E1E1

9-1. Outdoor fan motor control

The AC fan motor turns ON/OFF, interlocking with the compressor.
[ON] The AC fan motor turns ON 5 seconds before the compressor starts up.
[OFF] The AC fan motor turns OFF 15 seconds after the compressor has stopped running.

9-2. R.V. coil control

Heating

Cooling . . . . . . . . . . . . . . . . . OFF

Dry

NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor.

. . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . .

ON
OFF

9-3. Relation between main sensor and actuator

Sensor

Discharge temperature thermistor
Indoor coil temperature thermistor

Defrost thermistor

Fin temperature thermistor
Ambient temperature thermistor

Cooling : Coil frost prevention
Heating : High pressure protection
Cooling : High pressure protection
Heating : Defrosting

Cooling : Low ambient temperature operation
Heating : Defrosting (Heater)

Purpose

Protection

Protection

Compressor

21

LEV

Actuator

Outdoor

fan motor

R.V.coil

Indoor

fan motor

Defrost

heater

10

Jumper wire

Defrost finish temperature

(Initial setting)

JS

none
(cut)

Model

soldered

MUZ-A09YVH -

E1
E1

MUZ-A12YVH -

(Serial number 4000531~)
(Serial number 4000211~)

MUZ-A09YV -

E1
E1

MUZ-A12YV ­MUZ-A09YVH -

E1
E1

MUZ-A12YVH -

(Serial number ~4000530)
(Serial number ~4000210)

8:

5:

Housing point

SERVICE FUNCTIONS

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

E1E1

E1E1

CHANGE IN DEFROST SETTING

<JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed.

(Refer to page 32.)

11

TROUBLESHOOTING

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

11-1. Cautions on troubleshooting

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for mis-wiring.

2. Take care the following during servicing.

1) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after
confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the
electronic control P.C. board.

3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor.

4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.

5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2) Before servicing check that the connector and terminal are connected properly.

3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and

4) When troubleshooting, refer to the flow chart on page 23 and check table on page 24.

the components for bursting and discoloration.

E1E1

E1E1

22

11-2. Instruction of troubleshooting

Start

Indoor unit
operates.
Outdoor unit
doesn't
operate.

Outdoor unit
operates in
only Test Run
operation.

Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage".

Outdoor unit
doesn't
operate
even in
Test Run
operation.

Refer to A
"Check of
inverter/
compressor"
on page 26.

Indoor unit operates.
Outdoor unit doesn't
operate normally.

Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.

Refer to H
"Check of
R.V. coil"
on page 28.

Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.

Refer to
"Check of
remote controller
and receiver
P.C. board".

Indoor unit
doesn't receive
the signal from
remote controller.

Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.

1. Check indoor / outdoor
connecting wire.
(Check if the power
is supplied to the
indoor unit.)

2. Refer to
"Check of indoor
electronic control
P.C. board".

OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.

As for indoor unit MSZ type,
refer to service manual OB327.
As for indoor unit MCFZ type,
refer to service manual OB344.

MSZ type

Both lamps
(Left and right)
Flash on and off
at 0.5-second
intervals
Cause:
Indoor unit

• The horizontal
vanes are not
installed
correctly.

Refer to
"Check of
installation of
the horizontal
vanes".

Left lamp
Flash on and
off at

0.5-second
intervals
Cause:
Indoor/
Outdoor unit

• Mis-wiring or
trouble of
serial signal.

Refer to N
"How to check
of mis-wiring
and serial
signal error
(When
outdoor unit
doesn't work)"
on page 31.

Left lamp
2-time flash
Cause:
Indoor unit

• Trouble of
room temp­ erature/
indoor coil
thermistor

Check room
temperature
thermistor
and indoor
coil thermis­tor.
Refer to
"Test point
diagram and
voltage".

MSZ type

Left lamp
3-time flash
Cause:
Indoor unit

• Trouble of
indoor fan
motor

Refer to
"Check of
indoor fan
motor".

Left lamp
4-time flash
Cause:
Indoor unit

• Trouble of
indoor unit
control
system

Replace the
indoor
electronic
control
P.C. board.

Left lamp
5-time flash
Cause:
Outdoor unit

• Outdoor
power
system
abnormality

Refer to A
"Check of
inverter/
compressor"
on page 26.

Left lamp
6-time flash
Cause:
Outdoor unit

• Trouble of
thermistor
in outdoor
unit

Refer to G
"Check of
outdoor
thermistors"
on page 28.

Left lamp
7-time flash
Cause:
Outdoor unit

• Trouble of
outdoor
control
system

Replace the
inverter P.C.
board.

23

Abnormal point/ Condition

When compressor has stopped by overcurrent protection within
1 minute 3 times in a row after compressor start-up, unit stops.

When discharge temperature thermistor, fin temperature
thermistor or defrost thermistor shorts or opens during
compressor running, compressor stops and restarts 3 minutes
later.

When nonvolatile memory data cannot be read properly,
compressor stops and restarts 3 minutes later.

When 12A(MUZ-A09YV, MUZ-A09YVH)/ 20A(MUZ-A12YV,
MUZ-A12YVH) current flows into power transistor module,
compressor stops and restarts 3 minutes later.

When discharge temperature thermistor exceeds 116:,
compressor stops. Compressor can restart if discharge
temperature thermistor reads 100: or less 3 minutes later.

When temperature at heat sink exceeds 83: or temperature of
inverter P.C. board exceeds 79:, compressor stops and
restarts 3 minutes later.

When indoor coil thermistor exceeds 70:.
When the defrost thermistor exceeds 70: in COOL mode.

When current from power outlet exceeds 7A(MUZ-A09YV,
MUZ-A09YVH)/ 9A(MUZ-A12YV, MUZ-A12YVH), compressor
frequency lowers.

When indoor coil thermistor exceeds 55: in HEAT mode,
compressor frequency lowers.

When indoor coil thermistor reads 6: or less in COOL mode,
compressor frequency lowers.

When discharge temperature thermistor exceeds 110:,
compressor frequency lowers.

When discharge temperature has been 40: or less for 20
minutes.

No.

1

2

3

5

6

7

8

10

11

12

14

15

Symptom

LED indication

Detection method

Checkpoint

Outdoor unit
does not
operate

'Outdoor unit
stops and
restarts 3
minutes later'
is repeated

Outdoor unit
operates (at
low
frequency)

Outdoor unit
operates

1-time flash every

2.5 seconds

NOTE:
For abnormality
location, refer to
'Indoor
troubleshooting
check table'.
Refer to service
manual OB327.

2-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

5-time flash

2.5 seconds OFF

1-time flash

2.5 seconds OFF

3-time flash

2.5 seconds OFF

4-time flash

2.5 seconds OFF

7-time flash

2.5 seconds OFF

Outdoor power
system

Outdoor
thermistors

Outdoor control
system

Overcurrent
protection

Discharge
temperature
overheat
protection

Fin temperature
thermistor overheat
protection

High pressure
protection

Frequency drop by
current protection

Frequency drop by
high pressure
protection

Frequency drop by
defrosting in COOL
mode

Frequency drop by
discharge
temperature
protection

Low discharge
temperature
protection

· Check stop valve.

· Reconnect connectors.

· Refer to A "How to check inverter/
compressor" on page 26.

· Refer to G "Check of outdoor
thermistors" on page 28.

· Check stop valve.

· Reconnect connectors.

· Refer to A "How to check inverter/

compressor" on page 26.

Replace inverter P.C. board after
check of A "How to check inverter/
compressor" on page 26 and G
"Check of outdoor thermistors" on
page 28.

· Check refrigerant circuit and
refrigerant amount.

· Refer to G "Check of outdoor
thermistors" on page 28.

· Refer to L "Check of LEV" on page

30.

· Check around outdoor unit.

· Check outdoor unit air passage.

· Refer to I "Check of outdoor fan
motor" on page 29.

· Check refrigerant circuit and
refrigerant amount.

· Check stop valve.

The unit is normal, but check the
following.

· Check if indoor filters are clogged.

· Check if refrigerant is short.

· Check if indoor/outdoor unit air
circulation is short cycled.

· Refer to L "Check of LEV" on
page 30.

· Check refrigerant circuit and
refrigerant amount.

<Inverter P.C. board>

LED

Flashing

Refer to A "How to check inverter/
compressor" on page 26.

When the bus-bar voltage of inverter cannot be detected
normally.

Bus-bar voltage

8-time flash

2.5 seconds OFF

Compressor
sinusoidal current

When the waveform of compressor current is distorted.

· Check stop valve.

· Reconnect connector.

· Refer to A "How to check inverter/
compressor" on page 26.

8-time flash

2.5 seconds OFF

PAM protection
PAM:

Pulse
Amplitude
Modulation

When the overcurrent flows into IGBT(Insulated Gate Bipolar
transistor : TR821) or when the bus-bar voltage reaches 300V
or more, PAM stops and restarts.

This is not malfunction.
PAM protection will be activated in
the following cases;
1Instantaneous power voltage drop
(Short time power failure)
2When the power supply voltage is
high.

9-time flash

2.5 seconds OFF

Inverter check
mode

When the connector of compressor is disconnected, inverter
check mode starts.

Check if the connector is correctly
connected.
Refer to A "How to check inverter/
compressor" on page 26.

4

9

16

13

When ambient temperature thermistor shorts or opens during
compressor running.

5-time flash

2.5 seconds OFF

Outdoor
thermistors

· Refer to G "Check of outdoor
thermistors" on page 28.

1. Troubleshooting check table

NOTE 1. The location of LED is illustrated at the right figure. Refer to page 32.

2. LED lights up during normal operation.

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.

ON

2.5-second OFF

OFF

0.5-second ON

2.5-second OFF

24

0.5-second ON

2. Trouble criterion of main parts

Part name FigureCheck method and criterion

Outdoor fan motor(MF)
INNER FUSE
152i : CUT OFF

0
5

R.V. coil(21S4)

LEV(Expansion valve)

Measure the resistance between the terminals with a tester.
(Part temperature –15˚C ~ 40˚C)

WHT – BLK
BLK – RED

Abnormal

Open or

short-circuit

Normal

Measure the resistance between the terminals with a tester.
(Part temperature –15˚C ~ 40˚C)

Normal

1.90 k" ~ 2.39 k"

Abnormal

Open or short-circuit

WHT – RED
RED – ORN
YLW – BRN

BRN – BLU

Abnormal

Open or

short-circuit

Normal

39 " ~ 50 "

Measure the resistance with a tester.
(Part temperature : –15˚C ~ 40˚C)

Measure the resistance with a tester. (Part temperature –15˚C ~ 40˚C)

Color of lead wire

Color of lead wire

Discharge temperature
thermistor(RT62)

Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
(Part temperature 0˚C ~ 40˚C)

Normal

150 k" ~ 600 k"

30 k" ~ 180 k"

Abnormal

Open or short-circuit

Normal

5 k" ~ 65 k"

Abnormal

Open or short-circuit

Defrost thermistor
(RT61)

Fin temperature
thermistor(RT64)

Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
(Part temperature 0˚C ~ 40˚C)

Normal Abnormal

Open or short-circuit

Ambient temperature
thermistor(RT65)

WHT

RED

BLK

299 " ~ 374 "
242 " ~ 304 "

Measure the resistance between the terminals with a tester.
(Part temperature –15˚C ~ 40˚C)

Compressor(MC)

Defrost heater(H)

Measure the resistance with a tester.
(Part temperature -15˚C ~ 40˚C)

Normal

341 " ~ 427 "

Abnormal

Open or short-circuit

U-V

U-W

V-W

Abnormal

Open or

short-circuit

Normal

MUZ-A12YV

MUZ-A12YVH

0.42 " ~ 0.53 "

MUZ-A09YV

MUZ-A09YVH

1.31 " ~ 1.66"

23

W

U

V

1

WHT

RED BLK

FUSE

LEV

WHT

6

RED1
ORN4

YLW5

BRN2

BLU3

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

E1E1

E1E1

25

When OPERATION INDICATOR lamp flashes 5-time.
Outdoor unit does not operate.

A

How to check inverter/ compressor

Disconnect the connector (CN61)
between compressor and power
transistor module (IPM).

Check the voltage
between terminals.

Are the voltages

balanced?

See B “Check of open phase” on page 26.

No

Check the resistance of power transistor
module.

Yes

Check the
compressor.

B

Check of open phase

See D “Check of compressor” on page 27.

Is the resistance
infinite?

●With the connector between compressor and power transistor
module disconnected, activate the inverter and check if the inverter
is normal by measuring the balance of voltage between terminals.

Output voltage [V]

115V

<< Operation method>>
Start cooling or heating operation by pressing the EMERGENCY OPERATION

switch on the indoor unit. (test-run mode : refer to page 14)

<<Measurement point>>

at 3 points
BLK (U)-WHT (V)
BLK (U)-RED (W)
WHT(V)-RED (W)

w Measure AC voltage between
the lead wires at 3 points.

See C 'Check of power transistor module' on page 26.

Yes

Replace the inverter P.C.
board.

No
(0~several

")

Replace the inverter P.C.
board and compressor.

Inverter P.C. board

LED

Flashing

NOTE 1. Output voltage varies according to power supply voltage.

2. Measure the voltage by analog type tester.

3. During this check, LED of inverter P.C. board flashes 9 times.

C

Check of power transistor module

●Disconnect the connector (CN61) between compressor and

power transistor module, and measure the resistance between

terminals on the power transistor module.
<<Measurement point>>
at 6 points
BLK-WHT, WHT-BLK
BLK-RED, RED-BLK
WHT-RED, RED-WHT

<<Judgement>>
Infinite ["]···········Normal
0~dozens of ······Abnormal (short)

26

9-time flash

ohmmeter indication

"

X1

"

X1

Normal
(infinite)

Abnormal
(0~dozens of ")

2.5-second OFF

D

Check of compressor

Start

E "Check of compressor
winding" on page 27.

No

Replace the compressor.

Is the compressor normal?

Yes

F "Check of compressor
operation time" on page

27. Does the compressor
operate continuously?

No

Is the compressor
operation time more than
10 seconds?

Yes

Ok

E

Check of compressor winding

Check the refrigerant circuit.

● Disconnect the connector (CN61) between compressor and power
transistor module, and measure the resistance between the
compressor terminals.

<<Measurement point>>

at 3 points
BLK-WHT
BLK-RED
WHT-RED

w Measure the resistance between the
lead wires at 3 points.

<<Judgement>>

Refer to page 25.
0["] ···············Abnormal [short]
Infinite["] ·······Abnormal [open]
NOTE 1. Be sure to zero the ohmmeter before measurement.

2. Winding resistance for each phase at 20:.
Refer to page 5.

No

Yes

Ohmmeter indication

"

X1

"

X1

"

X1

Replace the compressor.

WHT

23

Normal

V

(1~several ")

Compressor motor

Abnormal
(0" ····· short)

Abnormal
(infinite····· open)

RED BLK

1

W

U

Check of compressor operation time

F

●Connect the compressor and activate the inverter. Then measure
the time until the inverter stops due to over current.

<<Operation method>>

Start heating or cooling operation by pressing the EMERGENCY
OPERATION switch on the indoor unit. (Test-run mode)

<<Measurement>>
Measure the time from the start of outdoor fan running to the

stop of compressor due to over current.

<<Judgement>>

For reference
0~10 seconds·····················Abnormal (compressor short)
10~60 seconds···················Abnormal (compressor lock-out)
60 seconds~5 minutes·······Abnormal (refrigerant circuit defect)
more than 5 minutes···········Normal

27

0 second

10 seconds

60 seconds

5 minutes

Outdoor fan starts
Abnormal
(Compressor winding short or layer short)

Abnormal
(Compressor lock-out)

Abnormal
(Refrigerant circuit defect, etc.)

Normal

When OPERATION INDICATOR lamp flashes 6-time.

Measure the
resistance
between CN641
1 and 2.

Measure the
resistance
between CN642
1 and 2.

No

Yes

Replace the
thermistor
except RT64.
In case of RT64,
replace the
inverter P.C.
board.
Since RT64 is
combined with
inverter P.C.
board.

Replace the inverter

P.C. board.

Disconnect the connectors CN641, CN642 and CN643 from the inverter P.C. board.

(Check the characteristics of each thermistor.)

1 Reconnect the

connectors CN641,
CN642 and CN643.

2 Disconnect the

connector between
the compressor and
power transistor
module.

Defrost thermistor RT61

Measure the
resistance
between CN641
3 and 4.

Turn ON the
power supply and
press the
EMERGENCY
OPERATION
switch.

Discharge
temperature
thermistor RT62

Fin temperature
thermistor RT64

Does the
resistance of the
thermistor have the
characteristics on
page 32?

No

Yes

Does the unit
operate 10 minutes
or more?

Is LED of the
inverter P.C. board
flashes 5 times?

Reconnect the
connector or

connecting wire.

Yes

No

Measure the
resistance
between CN643
1 and 2.

Ambient
temperature
thermistor RT65

The thermistors in the outdoor unit are abnormal.

G

Check of outdoor thermistors

Check of R.V. coil

H

w First of all, measure the resistance of R.V. coil to check if the coil is defective (refer to page 25).
w In case CN721 is not connected or R.V. coil is open, voltage is generated between the

terminal pins of the connector although any signal is not being transmitted to R.V. coil.
Check if CN721 is connected.

Unit operates COOL mode even if it is set to HEAT mode.

Disconnect connector (CN61) between
compressor and power transistor
module.
Turn ON the power supply and press the
EMERGENCY OPERATION switch
twice (HEAT mode).

Unit operates HEAT mode even if it is set to COOL mode.

Disconnect connector (CN61) between
compressor and power transistor
module.
Turn ON the power supply and press the
EMERGENCY OPERATION switch once
(COOL mode).

Is there 230V AC between CN7211 and
2 on the power P.C.board 3 minutes after
the power supply is turned ON?

Replace the 4-way valve.

Is there 230V AC between CN7211 and
2 on the power P.C.board 3 minutes after
the power supply is turned ON?

•Defective R.V. coil

•Defective 4-way valve

28

Yes

No

No

Power P.C. board
(soldered side)

Yes

Replace the
power P.C. board.

CN721

Replace the
power P.C. board.

Outdoor fan motor does not operate.

Is there voltage 230V

AC between indoor
terminal block 2 and
N?

Replace the
outdoor fan motor.

3 minutes after
power ON, is there voltage
230V AC between outdoor
terminal block 2 and N?

Is the resistance of fan
motor normal?

Is there voltage 230V
AC between CN771 2
and 3 on the power
P.C. board?

Disconnect the connector CN771 on the power P.C.
board.
Disconnect the connector (CN61) between
compressor and power transistor module.
Turn ON the power supply and press the
EMERGENCY OPERATION switch.

Yes

Yes

Yes

No

No

CN771

Power P.C. board

1

2

3

Fan

motor

Outdoor terminal block

3
N
2

Check the resistance of fan motor. (Refer to page 25.)

Replace the
power P.C. board.

Rectify indoor/ outdoor
connecting wire.

No

Replace the indoor

electronic control
P.C. board.

Replace the outdoor
fan motor.

No

Yes

Indoor/ outdoor
connecting
wire

Disconnect the connector
(CN61) between compressor and
power transistor module.
Turn ON power supply and press
the EMERGENCY OPERATION
switch.

Check the electric
parts in main circuit.

Ok.
If flash, refer to
page 24.

3 minutes after power
ON, is there voltage of
230V AC between
outdoor terminal block 2
and N?

Is there voltage
280V ~ 370V DC
between LD61A (+)
and LD66A (–) on the
inverter P.C. board?
(Refer to page 32.)

Dose LED on the inverter
P.C. board light up or
flash? (Refer to page 32.)

Outdoor terminal block

3
N
2

Yes

Yes

Yes

No

No

Replace the indoor

electronic control
P.C. board.

No

Yes

No

Indoor/ outdoor
connecting
wire

Replace the inverter
P.C. board.

LD66A

LD61A

(–)
(+)

280V~370V DC

Inverter P.C. board
(Pattern side)

Is there voltage 230V AC

between indoor terminal
block 2 and N?

Rectify indoor/ outdoor
connecting wire.

I

Check of outdoor fan motor

Inverter does not operate.

Check of power supply

J

29

Outdoor unit does not operate at all or stops immediately due to over current.

Replace the power P.C. board.

When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.

Does current-limiting resistor (R64) detect 10"?

No ∞

Yes

Ok

Start

Replace the LEV.

With remote controller set toward the indoor unit, press
the OPERATE/ STOP(ON/ OFF) button and confirm one
beep tone.

LEV operates in full-opening
direction.

Is LEV properly fixed to the
expansion valve?

Ok

Do you hear the expansion
valve "click, click·······"?
Do you feel the expansion
valve vibrate on touching it ?

Does the resistance of LEV
have the characteristics on
page 25?

Measure each voltage between connector pins
of CN724 on the inverter P.C. board.

1.Pin3(-) Pin1(+)

2.Pin4(-) Pin1(+)

3.Pin5(-) Pin1(+)

4.Pin6(-) Pin1(+)
Is there about 3~5V AC between each?
NOTE: Measure the voltage by an analog tester.

No

Yes

Yes

Yes

No

Replace the
expansion valve.

Yes

No

No

Properly fix the LEV to the
expansion valve.

Replace the
inverter P.C. board.

NOTE : After check of LEV, do the undermentioned
operations.

1. Turn OFF the power supply and
turn ON again.

2. Press the RESET button on the remote

controller.

Turn ON the power supply.
1 During pressing both the OPERATION SELECT
button and the TOO COOL button on the

remote controller at the same time,
press the RESET button.
2 First, release the RESET button.
And release the other two buttons since all LCD
in operation display section of the remote controller
is displayed after 3 seconds.

1 During pressing both the OPERATION SELECT
button and the TOO COOL button on the

remote controller at the same time,
press the RESET button.
2 First, release the RESET button.
And release the other two buttons since all LCD
in operation display section of the remote controller
is displayed after 3 seconds.

AMPM

CLOCK

:

AMPM

Replace the inverter P.C. board.

Is there 230V AC between CN722 1 and 3 on the
power P.C. board?

Yes

No

No problem of the
power P.C. board.

Is the voltage between CN726 6(+)-3(-) on the
power P.C. board 0V DC? (Refer to page 33.)

Yes

No

Replace the power
P.C. board.

NOTE: In case both thermistors are more than the above
temperature, cool them with cold water etc...

In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5: or less, and let the
defrost thermistor continue to read -1: or less.

3
2
1

230V AC

Check the following points before checking electric continuity.

1) Does the resistance of ambient temperature thermistor have the characteristics? (Refer to page 32.)

2) Is the resistance of defrost heater normal? (Refer to page 25.)

3) Does the heater protector remain conducted (not open)?

4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors?

26H

CN726

CN722

H

2

1

2

1

36

Check of current-limiting resistor

K

Heating/Cooling does not work sufficiently.

Check of LEV (Expansion valve)

L

Outdoor base gets frozen.

Check of defrost heater

M

<MUZ-A09YVH MUZ-A12YVH>

30

When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.

No

Replace the
indoor/ outdoor
connecting wire.

Is there voltage approximate 280V DC between
LD61A (+) and LD66A (–) on the inverter P.C.
board arter 3 minutes?

Turn OFF the power supply and then turn ON
again.
Press EMERGENCY OPERATION switch.
After 3 minutes, is there approximate 230V AC
between outdoor terminal block 2 and N?

w4 Replace the inverter P.C.

board.

Does the right side of OPERATION INDICATOR
lamp blink quickly?

w2 Mis-wiring may damage indoor electronic

control P.C. board during the operation.
Be sure to confirm the wiring is correct
before the operation starts.

Replace the indoor
electronic control
P.C. board.

No

Replace the indoor/ outdoor connecting wire.

Release the failure mode. w3

Yes

Yes

A

B

Turn OFF the power supply.
Disconnect the indoor/ outdoor connecting wire.
Short-circuit indoor terminal block N and 3.
Turn ON the power supply.
During pressing both the OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press the RESET button.
At first, release the RESET button.
And release the other two buttons since all LCD in
operation display section of the remote controller is
displayed after 3 seconds.
Transmit the signal of remote controller, pressing
OPERATE/STOP (ON/OFF) button on the remote
controller.
(The above procedure allows OPERATION INDICATOR
lamp to indicate the failure-mode.)

Remove the short-circuit between indoor terminal block N
and 3.
Reconnect the indoor/ outdoor connecting wire.
Turn ON the power supply.
Press the EMERGENCY OPERATION switch.
Is there amplitude of 5 to 10V DC between outdoor
terminal block N and 3 after 3 minutes (for confirmation of
serial signal)?

1. Turn OFF the power supply.

2. Disconnect the connector (CN61) between the
compressor and the power transistor module.

3. Turn ON the power supply.

4. Press the EMERGENCY OPERATION switch.

No

Yes

No

Yes

(light up or OFF)

Is mis-wiring
indicated when
the contactor
(52C) on the
indoor electronic
control P.C.
board turns ON
3 minutes later?

Yes

No

· Turn OFF inverter-controlled lighting
equipment.

· Turn OFF the power supply and then
turn ON again.

· Press the EMERGENCY
OPERATION switch.

B

· Reinstall
either the
unit or the
light each
other away.

· Attach a filter
on receiving
section of
the indoor
unit.

w3 Be sure to release the failure-mode

recall function after checking.

w4 Be careful to the residual voltage of smoothing capacitor.

Procedure of release of failure-mode.
1 Press the EMERGENCY

OPERATION switch.

2 Turn OFF the power supply.
3 Press the RESET button on the

remote controller.

Start

No

• Turn ON the power supply.

•

Press once EMERGENCY OPERATION switch.

Is there any mis-wiring, poor contact,
or wire disconnection? w2

Make them sure.

Yes

After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.w

w Short circuit of JPG and JPS on the indoor
electronic control P.C. board enables
self-check to be displayed in 3 seconds.

Yes

Is there 230V AC between outdoor terminal
block 2 and N?

No

Replace the
indoor/ outdoor
connecting wire.

A

•The following indication
applies regardless of shape
of the indicator.

Blinking

Operation Indicator

As for indoor unit MSZ type, refer to service manual OB327.
As for indoor unit MCFZ type, refer to service manual OB344.

AMPM

CLOCK

:

AMPM

Outdoor unit doesn’t operate.

How to check mis-wiring and serial signal error (when outdoor unit does not work)

N

31

MUZ-A09YV - MUZ-A12YV -

-20 -10 0 10 20 30 40

0

10

20

30

40

50

60

70

80

90

100

Temperature(:)

Ambient temperature thermistor(RT65)

Defrost thermistor(RT61)

Temperature(:)

Discharge temperature thermistor(RT62)

0 102030405060708090100110120

0

100

200

300

400

500

600

700

0 1020304050607080

0

20

40

60

80

100

120

140

160

180

200

Temperature(:)

Fin temperature thermistor(RT64)

Resistance(k")

Resistance(k")

Resistance(k")

MUZ-A09YVH - MUZ-A12YVH -

Inverter P.C. board

Back side of unit

(Refer to page 29.)

LD66A

LD61A

280V ~ 370V DC

E1E1

E1E1

230V AC

Jumper wire for change in defrost setting (JS)
(Refer to page 22.)

LED monitor
lamp

Output to drive
compressor
(LDU,LDV,LDW)

Front side of unit

Discharge temperature

thermistor (RT62)

Connecting

Defrost thermistor (RT61)

(CN641)

wire with
power P.C.
board
(CN725)

32

(CN642)

thermistor (RT65)

Fin temperature

thermistor (RT64)

(CN643)

Ambient temperature

LEV
connector
(CN724)

Connector
for indoor/
outdoor
communi-

Zero cross
signal
connector

(CN800)
cation
(CN601)

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

Power P.C. board

Back side of unit

E1E1

E1E1

Connecting wire with
inverter P.C. board
(CN726)
(Refer to page 30.)

R.V. coil
(CN721)

Front side of unit

230V AC

Output to drive
outdoor fan
motor (CN771)
230V AC

Heater connector
(CN722)

}

MUZ-A09YVH
MUZ-A12YVH

230V AC

230V AC

33

12

DISASSEMBLY INSTRUCTIONS

<"Terminal with lock mechanism" Detaching points>

In case of terminal with lock mechanism, detach the terminal as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism.
The terminal with no lock mechanism can be removed by pulling it out.
Check the shape of the terminal and work.

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector is a terminal

Sleeve

with lock mechanism

1Slide the sleeve.
2Pull the terminal while

Locking lever

MUZ-A09YV - MUZ-A12YV -

pushing the locking
lever.

E1E1

MUZ-A09YVH - MUZ-A12YVH ­OUTDOOR UNIT

OPERATING PROCEDURE

1. Removing the cabinet.

(1) Remove the screws fixing the top panel. (Photo 1)
(2) Remove the top panel. (Photo 1)
(3) Remove the screw fixing the service panel. (Photo 2)
(4) Pull down the service panel and remove it. (Photo 2)
(5) Remove the screws fixing the cabinet.
(6) Remove the cabinet.
(7) Disconnect the indoor/outdoor connecting wire.
(8) Remove the screws fixing the back panel.
(9) Remove the back panel.

1Hold the sleeve, and
pull out the terminal
slowly.

Connector

E1E1

PHOTOS

Photo 1

Screws of
the top panel

Screws of

the top panel

Photo 2

Screws of
the cabinet

Screw of the

service panel

Direction to

remove

Hooks

Screws of
the cabinet

Back
panel

Service

panel

34

OPERATING PROCEDURE

PHOTOS

2. Removing the inverter assembly, inverter P.C. board
and power P.C. board

(1) Remove the top panel, cabinet and service panel.

(Refer to 1.)

(2) Disconnect the indoor/outdoor connecting wire and remove

the back panel. (Refer to 1.)

(3) Disconnect the ground wire, the lead wire to the reactor

and the following connectors;
<Power P.C. board>
CN721 (4-way valve)

CN722 (Defrost heater) MUZ-A09/A12YVH­CN771 (Fan motor)
<Inverter P.C. board>
CN641 (Defrost thermistor and discharge temperature

thermistor)
CN643 (Ambient temperature thermistor)
CN724 (LEV)

(4) Remove the compressor connector (CN61).
(5) Remove the screws fixing the relay panel. (Photo 3)
(6) Remove the inverter assembly. (Photo 3)
(7) Disconnect all connectors and lead wires on the inverter

P.C. board. (Photo 4)

(8) Remove the inverter P.C. board from the inverter assembly.
(9) Remove the screw fixing the power P.C. board. (Photo 4)
(10)

Disconnect all connectors and lead wires on the power P.C.

board.

(11)

Remove the power P.C. board from the inverter assembly.

E1

Photo 3

Photo 4

Heat sink

Screws of the relay panel

Inverter
P.C. board

Screw of
the ground
wire

Power
P.C. board

3. Removing R.V. coil

(1) Remove the top panel, cabinet and service panel.

(Refer to 1.)

(2) Disconnect the indoor/outdoor connecting wire and remove

the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Remove the R.V. coil. (Photo 5)

Screw of the power
P.C. board

35

OPERATING PROCEDURE

PHOTOS

4. Removing the defrost thermistor and discharge tem­perature thermistor

(1) Remove the top panel, cabinet and service panel.

(Refer to 1.)

(2) Disconnect the indoor/outdoor connecting wire and remove

the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Pull out the defrost thermistor from its holder. (Photo 6)
(5) Pull out the discharge temperature thermistor from its

holder. (Photo 5)

Photo 5

Photo 6

R.V. coil

Discharge temperature thermistor

36

Defrost
thermistor

OPERATING PROCEDURE

PHOTOS

5. Removing outdoor fan motor

(1) Remove the top panel, cabinet and service panel.

(Refer to 1.)

(2) Disconnect the indoor/outdoor connecting wire and remove

the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Remove the propeller.
(5) Remove the screws fixing the fan motor. (Photo 7)
(6) Remove the fan motor. (Photo 7)

6. Removing the compressor and 4-way valve

(1) Remove the top panel, cabinet and service panel.

(Refer to 1.)
(2) Disconnect the indoor/outdoor connecting wire and remove

the back panel. (Refer to 1.)
(3) Remove the inverter assembly. (Refer to 2.)
(4) Recover gas from the refrigerant circuit.
(5) Detach the welded part of the suction and the discharge

pipe connected with compressor.
(6) Remove the nuts of compressor legs.
(7) Remove the compressor.
(8) Detach the welded part of pipes conneced with 4-way

valve. (Photo 8)

Photo 7

Photo 8

Propeller

Screws of
outdoor
fan motor

NOTE

● Before using a burner, reclaim gas from the pipes until the
pressure gauge shows 0 kg/cm

● Use the burner under the condition that gas can be recovered
even when the inner pressure rises by heat.

2

(0MPa).

Welded parts of 4-way valve

37

13

CABINET
GRILLE
PROPELLER
BASE
BASE
COMPRESSOR
COMPRESSOR
COMPRESSOR RUBBER SET
STOP VALVE (GAS)
STOP VALVE (LIQUID)
SERVICE PANEL
BACK PANEL
EXPANSION VALVE
EXPANSION VALVE COIL
4-WAY VALVE
SEPARATOR
SEPARATOR
MOTOR SUPPORT
CONDENSER NET
TOP PANEL
OUTDOOR HEAT EXCHANGER
OUTDOOR HEAT EXCHANGER
OUTDOOR FAN MOTOR
DEFROST HEATER
HEATER PROTECTOR
CAPILLARY TUBE

E02 838 232
E02 838 521
E02 838 501
E02 838 290
E02 840 290
E02 838 900
E02 839 900
E02 065 506
E02 838 661
E02 838 662
E02 838 245
E02 838 233
E02 838 640
E02 838 493
E02 838 961
E02 838 293
E02 840 293
E02 838 515
E02 838 523
E02 838 297
E02 838 630
E02 839 630
E02 838 301
E02 840 526
E02 840 381
E02 282 937

1
2
3

4

5
6

7
8

9
10
11
12
13

14
15

16
17

18
19

20
21
22

KNB073FBVH
KNB092FAAH
3RUBBERS/SET

{9.52
{6.35

RA6V21-

{3.0✕{2.0✕200

MC
MC

LEV

MF

H

26H

1
1
1
1

1

3
1
1
1
1
1
1
1
1

1
1
1
1

1

1

1
1
1

1
1

3
1
1
1
1
1
1
1

1
1
1
1
1

1
1
1
1

1
1
1
1

1
3
1
1
1
1
1
1
1
1

1
1
1

1
1

1

1
1
1

1

1
3
1
1
1
1
1
1
1

1
1
1
1

1
1
1
1
1

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

Part No.

No.

Part Name

MUZ-

A09YV-

E1

MUZ-

A12YV-

E1

MUZ-

A09YVH-

E1

MUZ-

A12YVH-

E1

PARTS LIST

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

E1E1

E1E1

13-1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

14

17

20

18
19

21

1

1516

13

11
12

10

9

2

Part number that is circled is not shown in the illustration.

3 4 5 6 7

38

8

REACTOR
POWER P.C. BOARD
POWER P.C. BOARD
R.V. COIL
THERMISTOR SET
AMBIENT TEMPERATURE THERMISTOR
FUSE HOLDER
FUSE
TERMINAL BLOCK
INVERTER P.C. BOARD
INVERTER P.C. BOARD

E02 838 337
E02 838 444
E02 840 444
E02 838 490
E02 838 306
E02 838 308
E02 735 241
E02 735 382
E02 838 374
E02 838 451
E02 839 451

1
2
3

4
5
6
7
8

9

Symbol

in Wiring

Diagram

Q'ty/unit

DEFROST, DISCHARGE

250V/20A
3P
Including heat sink and RT64
Including heat sink and RT64

Remarks

Part No.

No.

Part Name

L61

21S4

RT61,RT62

RT65

F61

TB

1
1

1
1
1
1
1
1
1

1

1
1
1
1
1
1
1
1

1
1

1
1
1
1
1
1

1

1

1
1
1
1
1
1
1

1

MUZ-

A09YV-

E1

MUZ-

A09YVH-

E1

MUZ-

A12YV-

E1

MUZ-

A12YVH-

E1

MUZ-A09YV - MUZ-A12YV ­MUZ-A09YVH - MUZ-A12YVH -

13-2. OUTDOOR UNIT

ELECTRICAL PARTS

E1E1

E1E1

9

8

7

6

1

2

3

4

5

39

MUZ-A09YV ­MUZ-A12YV -

E1

E1

13-3. DRAIN SOCKET

Outdoor unit {42 drain hole

1

Soft vinyl chloride hose of
25mm inside diameter.

Parts No. Parts Name

No.

1

E02 838 704

DRAIN SOCKET

Symbol

in Wiring

Diagram

Q'ty/unit

MUZ-A09YV-

E1

MUZ-A12YV-

11

E1

Remarks

HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN

CC

Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Apr. 2004. No. OB328 REVISED EDITION-A 6
Distributed in Jan. 2004. No. OB328 6
Made in Japan

New publication, effective Apr. 2004
Specifications subject to change without notice.