Mitsubishi MUZ-A15NA Split-system Air Conditioner Heat Pump User Manual

SERVICE MANUAL

CONTENTS

1. TECHNICAL CHANGES ··································· 3

2. PART NAMES AND FUNCTIONS ····················· 6

3. SPECIFICATION ················································ 7

4. OUTLINES AND DIMENSIONS ·······················11

5. WIRING DIAGRAM ·········································· 12

6. REFRIGERANT SYSTEM DIAGRAM ············· 20

7. DATA ································································ 23

8. ACTUATOR CONTROL ··································· 37

9. SERVICE FUNCTIONS ··································· 38

10. TROUBLESHOOTING ····································· 38

11. DISASSEMBLY INSTRUCTIONS ···················· 65

12. PARTS LIST ····················································· 72

12-1. PARTS LIST ··········································· 72

12-2. RoHS PARTS LIST ································ 78

13. OPTIONAL PARTS ······················ BACK COVER

Models

MUZ-A09NA,-

MUZ-A12NA,-

MUZ-A15NA,-

MUZ-A17NA,-

MUZ-A24NA,-

MUY-A15NA

MUY-A17NA

MUY-A24NA

MUZ-GA24NA,-

MUY-GA24NA

SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

Indoor unit service manual

MSZ-A•NA Series (OB450)

MSZ-GA•NA Series (OB450)

MUZ-A09/12/15/17NA

MUY-A15/17NA

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

For servicing of RoHS compliant products, refer to the PARTS LIST

(RoHS compliant).

HFC

utilized

R410A

No. OB451

REVISED EDITION-G

Please void OB451 REVISED EDITION-F.

Revision G:

• Errors in TROUBLESHOOTING have been

corrected.

Revision A:

• MUZ-A09NA -

and MUZ-A09NA -

have been added.

Revision B:

• 10-5. ”Check of outdoor thermistors” has been corrected.

Revision C:

• 10-6. ”Test point diagram and voltage” has been corrected.

10-6.3. ”Outdoor electronic control P.C. board”, the chart of thermistor has been corrected.

Revision D:

• MUZ-A24NA -

, MUZ-A24NA -

and MUY-A24NA -

have been added.

Revision E:

• MUZ-GA24NA and MUY-GA24NA

have been added.

Revision F:

• The fan guard for MUZ-A24NA, -

, -

and MUZ-GA24NA, -

has been changed.

Use the speci¿ ed refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.

Correct refrigerant is specified in the manuals and on the spec labels provided with our products.

We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by

failure to follow the instructions.

Revision G:

• Errors in TROUBLESHOOTING have been corrected.

MUZ09UN ĺ MUZ-A09NA MUZ12UN ĺ MUZ-A12NA

MUH15TN ĺ MUZ-A15NA MUH17TN ĺ MUZ-A17NA

MUH24WN ĺ MUZ-A24NA

MU15TN ĺ MUY-A15NA MU17TN ĺ MUY-A17NA

MU24WN ĺ MUY-A24NA

1. Outdoor unit model has been changed.

2. Control method between indoor and outdoor unit has been changed.

3. Refrigerant has been changed. (R22 ĺ R410A)

4. Fan motor has been changed. (AC ĺ DC)

5. Compressor has been changed. (AC ĺ DC)

MUZ-A09NA ĺ MUZ-A09NA -

MUZ-A09NA -

ĺ MUZ-A09NA -

1. Refrigerant system diagram has been changed.

MUZ-A24NA ĺ MUZ-A24NA -

MUZ-A24NA -

ĺ MUZ-A24NA -

MUY-A24NA ĺ MUY-A24NA -

1. Wiring diagram has been changed.

MUZ-A24NA -

ĺ MUZ-GA24NA

MUZ-A24NA -

ĺ MUZ-GA24NA -

MUY-A24NA -

ĺ MUY-GA24NA

1. Compressor has been changed. (SNB130FPDH ĺ SNB130FQBH)

2. Wiring diagram has been changed.

3. Fan motor has been changed.

4. ELECTRONIC CONTROL P.C. Board has been changed.

TECHNICAL CHANGES

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

• This room air conditioner adopts 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 condition-

ers.

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.

Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and installa-

tion, since it is more susceptible to contaminations than R22.

For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant pip-

ing.)

Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent

composition change.

New refrigerant Previous refrigerant

Refrigerant

Refrigerant R410A R22

Composition (Ratio) HFC-32: HFC-125 (50%: 50%) R22 (100%)

Refrigerant handling Pseudo-azeotropic refrigerant Single refrigerant

Chlorine Not included Included

Safety group (ASHRAE) A1 / A1 A1

Molecular weight 72.6 86.5

Boiling point (°F) -60.5 -41.4

Steam pressure [77°F] (PSIG) 225.82 136.34

Saturated steam density [77°F] (lb./ft.

) 3.995 2.772

Combustibility Non combustible Non combustible

ODP

1 0 0.055

GWP

2 1730 1700

Refrigerant charge method From liquid phase in cylinder Gas phase

Additional charge on leakage Possible Possible

Refrigeration oil

Kind Incompatible oil Compatible oil

Color None Light yellow

Smell None None

1: Ozone Depletion Potential: based on CFC-11

2: Global Warming Potential: based on CO2

New Specification Current Specification

Compressor

The incompatible refrigeration oil easily separates from

refrigerant and is in the upper layer inside the suction

mufÀ er.

Raising position of the oil back hole enables to back the

refrigeration oil of the upper layer to flow back to the

compressor.

Since refrigerant and refrigeration oil are compatible with

each other, refrigeration oil goes back to the compressor

through the lower position oil back hole.

Compressor

Suction muffler

Oil back hole

refrigeration oil

Refrigerant

Compressor

Suction muffler

Oil back hole

Refrigeration oil /Refrigerant

-22 -4 14 32 50 68

104 122 140

-73

145

218

290

363

435

508

580

(PSIG)

R410A

R22

Conversion chart of refrigerant temperature and pressure

Saturated liquid pressure

(°F)

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.

R410A tools

Can R22 tools

be used?

Description

Gauge manifold No

R410A has high pressures beyond the measurement range of existing gaug-

es.

Charge hose No Hose material have been changed to improve the pressure resistance.

Gas leak detector No Dedicated for HFC refrigerant.

Torque wrench

Yes 1/4 in. and 3/8 in.

No 1/2 in. and 5/8 in.

Flare tool Yes Clamp bar hole has been enlarged to reinforce the spring strength in the tool.

Flare gauge New Provided for flaring work (to be used with R22 flare tool).

Vacuum pump adapter

New

Provided to prevent the back flow of oil. This adapter enables you to use vac-

uum pumps.

Electronic scale for refrigerant

charging

New

It is difficult to measure R410A with a charging cylinder because the refriger-

ant bubbles due to high pressure and high-speed vaporization

No: Not Substitutable for R410A Yes: Substitutable for R410A

2. Refrigerant piping

Specifications

Use the copper or copper-alloy seamless pipes for refrigerant that meet the following specifications.

Outside diameter (in.) Wall thickness (in.) Insulation material

1/4 0.0315

Heat resisting foam plastic Specific gravity 0.045

Thickness 0.315 in.

3/8 0.0315

1/2 0.0315

5/8 0.0394

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”.

Pipe diameter (in.)

Dimension of flare nut mm (in.)

R410A R22

1/4 17 (11/16) 17 (11/16)

3/8 22 (7/8) 22 (7/8)

1/2 26 (1-1/32) 24 (15/16)

5/8 29 (1-5/32) 27 (1-1/16)

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 cir-

cuit.

• 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, capacity of the refrigeration 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.

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)

PART NAMES AND FUNCTIONS

Air outlet

Drain outlet

Piping

Drain hose

Air inlet

(back and side)

MUZ-A09NA MUZ-A15NA MUY-A15NA

MUZ-A12NA MUZ-A17NA MUY-A17NA

MUZ-A24NA MUY-A24NA

MUZ-GA24NA MUY-GA24NA

Piping

Air outlet

Drain hose

Drain outlet

Air inlet

(back and side)

Item Model MSZ-A09NA MSZ-A12NA

Capacity

Rated (Minimum-Maximum)

Cooling

1 Btu/h 9,000 (5,500-9,000) 12,000 (5,700-12,000)

Heating 47

1 Btu/h 10,900 (5,200-12,600) 13,600 (5,200-13,600)

Capacity Heating 17 2 Btu/h 7,700 8,300

Power consumption

Rated (Minimum-Maximum)

Cooling 1 W 690 (390-690) 1,170 (395-1,170)

Heating 47 1 W 860 (350-1,100) 1,160 (350-1,160)

Power consumption Heating 17

2 W 880 930

EER 1 [SEER] 3 Cooling 13.0 [17.0] 10.3 [17.0]

HSPF IV(V) 4 Heating 8.2 (7.1) 8.2 (7.1)

COP Heating 1 3.71 3.44

Outdoor unit model

MUZ-A09NA

MUZ-A09NA -

MUZ-A12NA

Power supply V , phase , Hz 208/230, 1, 60

Max. fuse size (time delay) A 15

Min. circuit ampacity A 12

Fan motor F.L.A 0.52

Compressor

Model KNB092FPAH

Winding resistance (at 68ÛF) 

0.49

R.L.A 7.8

L.R.A 9.2

Refrigerant control Liner expansion valve

Sound level 1 dB(A) 48

Defrost method Reverse cycle

Dimensions

W in. 31-1/2

D in. 11-1/4

H in. 21-5/8

Weight Ib. 82 75 82

External ¿ nish Munsell 3Y 7.8/1.1

Remote controller Wireless type

Control voltage (by built-in transformer) 12 - 24 VDC

Refrigerant piping Not supplied

Refrigerant pipe size

(Min. wall thickness)

Liquid in. 1/4 (0.0315)

Gas in. 3/8 (0.0315)

Connection method

Indoor Flared

Outdoor Flared

Between the indoor &

outdoor units

Height difference

ft. 40

Piping length ft. 65

Refrigerant charge (R410A) 2 lb. 5 oz. 2 lb. 2 lb. 5 oz.

Refrigeration oil (Model) NEO22

NOTE: Test conditions are based on ARI 210/240.

1: Rating conditions (Cooling) — Indoor: 80ÛFDB, 67ÛFWB, Outdoor: 95ÛFDB, (75ÛFWB) Rated frequency

(Heating) — Indoor: 70ÛFDB, 60ÛFWB, Outdoor: 47ÛFDB, 43ÛFWB Rated frequency

2: (Heating) — Indoor: 70ÛFDB, 60ÛFWB, Outdoor: 17ÛFDB, 15ÛFWB Maximum frequency

SPECIFICATION

Item Model MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA

Capacity

Rated

(Minimum-Maximum)

Cooling 1 Btu/h

15,000

(3,100-15,000)

15,000

(3,100-15,000)

16,200

(3,100-16,200)

16,200

(3,100-16,200)

Heating 47 1 Btu/h

18,000

(3,400-20,900)

–

20,100

(3,400-20,900)

–

Capacity Heating 17

2 Btu/h 13,000 – 13,000 –

Power consumption

Rated (Minimum-Maximum)

Cooling 1 W 1,690 (210-1,690) 1,690 (210-1,690) 2,070 (210-2,070) 2,070 (210-2,070)

Heating 47

1 W 1,790 (250-2,330) – 2,150 (250-2,330) –

Power consumption Heating 17 2 W 1,740 – 1,740 –

EER 1 [SEER]

3 Cooling 8.9 [16.0] 8.9 [16.0] 7.8 [16.0] 7.8 [16.0]

HSPF IV(V) 4 Heating 8.2 (7.1) – 8.2 (7.1) –

COP Heating

1 2.95 – 2.74 –

Outdoor unit model MUZ-A15NA MUY-A15NA MUZ-A17NA MUY-A17NA

Power supply V , phase , Hz 208/230, 1, 60

Max. fuse size (time delay) A 15

Min. circuit ampacity A 14

Fan motor F.L.A 0.52

Compressor

Model SNB130FPDH

Winding resistance (at 68ÛF) 

0.45

R.L.A 10.1

L.R.A 12

Refrigerant control Liner expansion valve

Sound level 1 dB(A) 50 50 52 52

Defrost method 51 — 53 —

Dimensions

W in. 31-1/2

D in. 11-1/4

H in. 21-5/8

Weight Ib. 88

External ¿ nish Munsell 3Y 7.8/1.1

Remote controller Wireless type

Control voltage (by built-in transformer) 12 - 24 VDC

Refrigerant piping Not supplied

Refrigerant pipe size

(Min. wall thickness)

Liquid in. 1/4 (0.0315)

Gas in. 1/2 (0.0315)

Connection method

Indoor Flared

Outdoor Flared

Between the indoor &

outdoor units

Height difference ft. 40

Piping length ft. 65

Refrigerant charge (R410A) 2 lb. 7 oz.

Refrigeration oil (Model) NEO22

NOTE: Test conditions are based on ARI 210/240.

1: Rating conditions (Cooling) — Indoor: 80ÛFDB, 67ÛFWB, Outdoor: 95ÛFDB, (75ÛFWB) Rated frequency

(Heating) — Indoor: 70ÛFDB, 60ÛFWB, Outdoor: 47ÛFDB, 43ÛFWB Rated frequency

2: (Heating) — Indoor: 70ÛFDB, 60ÛFWB, Outdoor: 17ÛFDB, 15ÛFWB Maximum frequency

Item Model MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA

Capacity

Rated Minimum-Maximum)

Cooling

1 Btu/h

22,000

(4,400-22,000)

22,000

(4,400-22,000)

22,000

(4,400-22,000)

22,000

(4,400-22,000)

Heating 47 1 Btu/h

23,200

(3,600-24,400)

—

23,200

(3,600-24,400)

—

Capacity Heating 17 2 Btu/h 15,200 — 15,200 —

Power consumption

Rated (Minimum-Maximum)

Cooling 1 W 2,880 (290-2,880) 2,880 (290-2,880) 2,500 (270-2,500) 2,500 (270-2,500)

Heating 47

1 W 2,350 (260-2,570) — 2,140 (250-2,520) —

Power consumption Heating 17

2 W 1,960 — 1,870 —

EER

1 [SEER] 3 Cooling 7.6 [16.0] 7.6 [16.0] 8.8 [17.5] 8.8 [17.5]

HSPF IV(V) 4 Heating 8.2 (7.1) — 9.5 (7.1) —

COP Heating

1 2.89 — 3.17 —

Outdoor unit model MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

Power supply V , phase , Hz 208/230, 1, 60

Max. fuse size (time delay) A 20

Min. circuit ampacity A 17

Fan motor F.L.A 0.93

Compressor

Model SNB130FPDH SNB130FQBH

Winding resistance (at 68ÛF) 

0.45 0.98

R.L.A 10.1 12.8

L.R.A 16.0 16.0

Refrigerant control Liner expansion valve

Sound level 1 dB(A) 55

Defrost method Reverse cycle

Dimensions

W in. 33-1/16

D in. 13

H in. 33-7/16

Weight Ib. 128 117

External ¿ nish Munsell 3Y 7.8 1.1

Remote controller Wireless type

Control voltage (by built-in transformer) 12 - 24 VDC

Refrigerant piping Not supplied

Refrigerant pipe size

(Min. wall thickness)

Liquid in. 1/4 (0.0315)

Gas in. 5/8 (0.0394)

Connection method

Indoor Flared

Outdoor Flared

Between the indoor &

outdoor units

Height difference ft. 50

Piping length ft. 100

Refrigerant charge (R410A) 4 lb.

Refrigeration oil (Model) NEO22

NOTE: Test conditions are based on ARI 210/240.

1: Rating conditions (Cooling) — Indoor: 80ÛFDB, 67ÛFWB, Outdoor: 95ÛFDB, (75ÛFWB) Rated frequency

(Heating) — Indoor: 70ÛFDB, 60ÛFWB, Outdoor: 47ÛFDB, 43ÛFWB Rated frequency

2: (Heating) — Indoor: 70ÛFDB, 60ÛFWB, Outdoor: 17ÛFDB, 15ÛFWB Maximum frequency

Test condition

3, 4

Mode Test

Indoor air condition (ÛF) Outdoor air condition (ÛF)

Dry bulb Wet bulb Dry bulb Wet bulb

ARI

SEER

(Cooling)

"A" Cooling Steady State at rated compres-

sor Speed

80 67 95 (75)

"B-2" Cooling Steady State at rated com-

pressor Speed

80 67 82 (65)

"B-1" Cooling Steady State at minimum

compressor Speed

80 67 82 (65)

Low ambient Cooling Steady State at mini-

mum compressor Speed

80 67 67 (53.5)

Intermediate Cooling Steady State At Inter-

mediate compressor Speed

80 67 87 (69)

HSPF

(Heating)

Standard Rating-Heating at rated compres-

sor Speed

70 60 47 43

Low temperature Heating at rated compres-

sor Speed

70 60 17 15

Max temperature Heating at minimum com-

pressor Speed

70 60 62 56.5

High temperature Heating at minimum com-

pressor Speed

70 60 47 43

Frost Accumulation at rated compressor

Speed

70 60 35 33

Frost Accumulation at Intermediate com-

pressor Speed 5

70 60 35 33

5: At Intermediate compressor Speed = ("Cooling rated compressor speed" - "minimum compressor speed") / 3 + "minimum

compressor speed".

OPERATING RANGE

(1) POWER SUPPLY

Rated voltage Guaranteed Voltage (V)

Outdoor unit

208/230 V

1 phase

60 Hz

Min.187

208 230 Max.253

(2) OPERATION

Mode Condition

Intake air temperature (°F)

Indoor Outdoor

DB WB DB WB

Cooling

Standard temperature 80 67 95 —

Maximum temperature 90 73 115 —

Minimum temperature 67 57 14 —

Maximum humidity 78% —

Heating

Standard temperature 70 60 47 43

Maximum temperature 80 67 75 65

Minimum temperature 70 60

5 (MUZ-GA24)

4 (MUZ-GA24)

Except -

model

30°

35°

6-1/28

3-17/32

7-25/32

1-9/16

20-9/32

11-25/32

2-19/32

14-3/16

33-7/16

16-15/16

19-11/16

3-3/16

4-25/32

33-1/16

Open as a rule

20 inch or more if

the front and both

sides are open

4 inch or more /

8 inch or more if

there are obstacles

to both sides

Open as a rule

20 inch or more if the back,

both sides and top are open

14 in. or more

4 in. or more

Air in

Air out

Service panel

Gas refrigerant

pipe joint

Refrigerant pipe

(flared) ø5/8

Liquid refrigerant

pipe joint

Refrigerant pipe

(flared) ø1/4

Drain hole ø1-5/8

4-3/8 13/16 Oval hole

REQUIRED SPACE

Air in

Liquid pipe :1/4 (flared)

Gas pipe :3/8 (flared) ··· MUZ-A09/12NA

:1/2 (flared) ··· MUZ-A15/17NA, MUY-A15/17NA

6-23/32

5-7/8

2-23/32

1-3/4

15-3/4

12 ~ 12-3/4

13-9/16

11/16

1-9/16

7/8

21-5/8

11-1/32

13/32

31-1/2

19-11/16

5-15/16

11-29/32

17/3229/32 11-1/4

Air in

handle

Air in

Air out

2- 3/8 13/16 Oval hole

Drain hole ø1-5/8

{

REQUIRED SPACE

Basically open 4 inch or more

without any obstruction in front

and on both sides of the unit.

14 in. or more

8 in. or more

4 in. or more

4 in.

or more

Open two sides of left,

right, or rear side.

Unit: inch

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

OUTLINES AND DIMENSIONS

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA

5 WIRING DIAGRAM

MUY-A15NA MUY-A17NA

MUZ-A24NA MUZ-A24NA-

MUZ-A24NA-

MUY-A24NA

MUY-A24NA-

MUZ-GA24NA

MUY-GA24NA

Outdoor

heat

exchanger

Flared connection

Defrost

thermistor

RT61

Discharge

temperature

thermistor

RT62

Service

port

Service

port

Flared connection

Stop valve

(with strainer)

Stop valve

(with service port)

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating (MUZ)

Refrigerant pipe ø3/8 (MUZ-A09/12)

ø1/2 (MUZ-A15/17,MUY-A15/17)

(with heat insulator)

Refrigerant pipe ø1/4

(with heat insulator)

R.V. coil

heating ON

cooling OFF

Strainer

#100

Capillary tube

O.D. 0.118 × I.D. 0.071

× 23-5/8

(ø

3.0

ø1.8

600

)

Expansion

valve

Ambient

temperature

thermistor

RT65

Muffler

Outdoor

heat

exchanger

Flared connection

Defrost

thermistor

RT61

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

(with strainer)

Stop valve

(with service port)

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe ø3/8

(with heat insulator)

Refrigerant pipe ø1/4

(with heat insulator)

Capillary tube

O.D. 0.118 × I.D. 0.079

× 9-7/16

(ø3.0 × ø2.0 × 240)

Expansion

valve

R.V. coil

heating ON

cooling OFF

Strainer

#100

Muffler

Ambient

temperature

thermistor

RT65

Muffler

Unit: inch

MUZ-A09NA MUZ-A09NA-

MUZ-A12NA MUZ-A15NA MUZ-A17NA

MUY-A15NA MUY-A17NA

MUZ-A09NA-

REFRIGERANT SYSTEM DIAGRAM

MUZ-A24NA MUZ-GA24NA

Outdoor

heat

exchanger

Flared connection

Defrost

thermistor

RT61

Service

port

Service

port

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

(with service port)

Capillary tube

Refrigerant flow in cooling

Compressor

4-way valve

Refrigerant flow in heating

Refrigerant pipe ø5/8

(with heat insulator)

Refrigerant pipe ø1/4

(with heat insulator)

LEV

R.V. coil

heating ON

cooling OFF

Muffler

#100

Strainer

#100

Receiver

Outdoor heat

exchanger

temperature

thermistor

RT68

Ambient

temperature

thermistor

RT65

Strainer

#100

O.D. 0.142 × I.D. 0.094

× 1-31/32

(ø

3.6 × ø2.4 × 50

)

MUY-A24NA MUY-GA24NA

Outdoor

heat

exchanger

Flared connection

Discharge

temperature

thermistor

RT62

Flared connection

Stop valve

(with service port)

Capillary tube

Refrigerant flow in cooling

Compressor

Service

port

Service

port

4-way valve

Refrigerant pipe ø5/8

(with heat insulator)

Refrigerant pipe ø1/4

(with heat insulator)

LEV

Muffler

#100

Strainer

#100

Receiver

Outdoor heat

exchanger

temperature

thermistor

RT68

Ambient

temperature

thermistor

RT65

Strainer

#100

O.D. 0.142 × I.D. 0.094

× 1-31/32

(ø

3.6 × ø2.4 × 50

)

Unit: inch

Max. Length

Max. Height

difference

Indoor

unit

Outdoor unit

MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE

Model

Refrigerant piping: ft. Piping size O.D: in.

Max. Length

Max. Height difference

Gas Liquid

MUZ-A09NA

MUZ-A12NA

65 40

3/8 1/4

MUZ-A15NA

MUY-A15NA

MUZ-A17NA

MUY-A17NA

1/2 1/4

MUZ-A24NA

MUY-A24NA

MUZ-GA24NA

MUY-GA24NA

100 50 5/8 1/4

ADDITIONAL REFRIGERANT CHARGE (R410A: oz.)

Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

Model

Outdoor unit

precharged

Refrigerant piping length (one way): ft.

25 30 40 50 60 65

MUZ-A09NA

MUZ-A09NA -

MUZ-A12NA

2 lb. 5 oz.

0 1.62 4.86 8.10 11.34 12.96

MUZ-A09NA -

2 lb.

MUZ-A15NA

MUY-A15NA

MUZ-A17NA

MUY-A17NA

2 lb. 7 oz.

Calculation: X oz. = 1.62/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)

Model

Outdoor unit

precharged

Refrigerant piping length (one way): ft.

25 30 40 50 60 70 80 90 100

MUZ-A24NA

MUY-A24NA

MUZ-GA24NA

MUY-GA24NA

4 lb. 0 1.08 3.24 5.40 7.56 9.72 11.88 14.04 16.20

Calculation: X oz. = 1.08/5 oz. / ft. × (Refrigerant piping length (ft.) - 25)

NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation.

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA MUZ-GA24NA

MUY-A15NA MUY-A17NA MUY-A24NA MUY-GA24NA

7-1. PERFORMANCE DATA

1) COOLING CAPACITY

Model

Indoor air Outdoor intake air DB temperature (ÛF)

IWB 75 85 95 105 115

(ÛF) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC

MUZ-A09NA

71 11.0 6.4 0.61 10.3 5.9 0.67 9.7 5.6 0.72 9.0 5.2 0.76 8.3 4.8 0.79

67 10.4 7.4 0.58 9.7 6.9 0.64 9.0 6.4 0.69 8.4 5.9 0.73 7.7 5.5 0.77

63 9.8 8.3 0.55 9.1 7.7 0.61 8.5 7.1 0.66 7.7 6.5 0.70 7.0 5.9 0.73

MUZ-A09NA

71 11.0 6.4 0.61 10.3 5.9 0.67 9.7 5.6 0.72 9.0 5.2 0.76 8.3 4.8 0.79

67 10.4 7.4 0.58 9.7 6.9 0.64 9.0 6.4 0.69 8.4 5.9 0.73 7.7 5.5 0.77

63 9.8 8.3 0.55 9.1 7.7 0.61 8.5 7.1 0.66 7.7 6.5 0.70 7.0 5.9 0.73

MUZ-A12NA

71 14.7 8.5 1.04 13.7 7.9 1.14 12.9 7.4 1.23 12.0 6.9 1.29 11.0 6.4 1.35

67 13.9 9.9 0.98 13.0 9.2 1.08 12.0 8.5 1.17 11.2 7.9 1.24 10.3 7.3 1.30

63 13.1 11.0 0.94 12.1 10.2 1.04 11.3 9.5 1.12 10.3 8.7 1.19 9.4 7.9 1.24

MUY-A15NA

MUZ-A15NA

71 18.4 9.5 1.50 17.2 8.9 1.65 16.1 8.3 1.77 15.0 7.8 1.87 13.8 7.1 1.94

67 17.4 11.3 1.42 16.2 10.5 1.56 15.0 9.8 1.69 14.0 9.1 1.79 12.8 8.3 1.88

63 16.4 12.8 1.35 15.2 11.9 1.50 14.1 11.0 1.61 12.8 10.0 1.72 11.7 9.2 1.79

MUY-A17NA

MUZ-A17NA

71 19.8 10.3 1.84 18.5 9.6 2.02 17.4 9.0 2.17 16.2 8.4 2.29 14.9 7.7 2.38

67 18.8 12.2 1.74 17.5 11.4 1.91 16.2 10.5 2.07 15.1 9.8 2.19 13.9 9.0 2.30

63 17.7 13.8 1.66 16.4 12.8 1.83 15.2 11.9 1.98 13.9 10.8 2.11 12.6 9.9 2.19

MUY-A24NA

MUZ-A24NA

71 27.0 13.4 2.56 25.2 12.5 2.81 23.7 11.7 3.02 22.0 10.9 3.18 20.2 10.1 3.31

67 25.5 16.1 2.42 23.8 15.0 2.66 22.0 13.9 2.88 20.5 12.9 3.05 18.8 11.9 3.20

63 24.0 18.3 2.30 22.2 17.0 2.55 20.7 15.8 2.75 18.8 14.4 2.94 17.2 13.1 3.05

MUY-GA24NA

MUZ-GA24NA

71 27.0 13.4 2.23 25.2 12.5 2.44 23.7 11.7 2.63 22.0 10.9 2.76 20.2 10.1 2.88

67 25.5 16.1 2.10 23.8 15.0 2.31 22.0 13.9 2.50 20.5 12.9 2.65 18.8 11.9 2.78

63 24.0 18.3 2.00 22.2 17.0 2.21 20.7 15.8 2.39 18.8 14.4 2.55 17.2 13.1 2.65

NOTE: 1. IWB: Intake air wet-bulb temperature

TC: Total Capacity (×10

Btu/h)

SHC: Sensible Heat Capacity (×10

Btu/h)

TPC: Total Power Consumption (kW)

2. SHC is based on 80ÛF of indoor Intake air DB temperature.

2) COOLING CAPACITY CORRECTIONS

Model

Refrigerant piping length (one way: ft.)

25 (std.) 40 65 100

MSZ-A09/12/15/17NA

MSY-A15/17NA

1.0 0.954 0.878

MSZ-A24NA

MSY-A24NA

MSZ-GA24NA

MSY-GA24NA

1.0 0.95 0.878 0.713

7 DATA

3) HEATING CAPACITY

Model

Indoor air Outdoor intake air WB temperature (ÛF)

IDB 5 15 25 35 43 45 55

(ÛF) TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC TC TPC

MUZ-A09NA

MUZ-A09NA -

——

6.3 0.64 7.9 0.75 9.4 0.84 10.6 0.88 11.0 0.89 12.4 0.93

70 6.7 0.62 8.2 0.74 9.6 0.82 10.9 0.86 11.2 0.88 12.7 0.91

65 6.9 0.59 8.6 0.71 10.0 0.80 11.2 0.84 11.6 0.85 13.0 0.89

MUZ-A09NA -

——

6.3 0.64 7.9 0.75 9.4 0.84 10.6 0.88 11.0 0.89 12.4 0.93

70 6.7 0.62 8.2 0.74 9.6 0.82 10.9 0.86 11.2 0.88 12.7 0.91

65 6.9 0.59 8.6 0.71 10.0 0.80 11.2 0.84 11.6 0.85 13.0 0.89

MUZ-A12NA

——

7.9 0.86 9.9 1.02 11.8 1.13 13.3 1.19 13.7 1.21 15.5 1.25

70 8.4 0.84 10.2 0.99 12.0 1.10 13.6 1.16 14.0 1.18 15.8 1.23

65 8.6 0.80 10.7 0.96 12.4 1.07 14.0 1.13 14.4 1.15 16.2 1.21

MUZ-A15NA

——

10.4 1.33 13.1 1.57 15.6 1.75 17.6 1.83 18.1 1.86 20.5 1.93

70 11.1 1.29 13.5 1.53 15.9 1.70 18.0 1.79 18.5 1.83 21.0 1.90

65 11.3 1.24 14.1 1.48 16.5 1.66 18.5 1.75 19.1 1.77 21.4 1.86

MUZ-A17NA

——

11.7 1.60 14.6 1.88 17.4 2.10 19.6 2.20 20.2 2.24 22.9 2.32

70 12.4 1.55 15.1 1.84 17.8 2.04 20.1 2.15 20.7 2.19 23.4 2.28

65 12.7 1.48 15.8 1.77 18.4 1.99 20.7 2.10 21.3 2.13 23.9 2.24

MUZ-A24NA

——

13.5 1.75 16.8 2.06 20.1 2.29 22.6 2.41 23.3 2.44 26.4 2.54

70 14.3 1.69 17.4 2.01 20.5 2.23 23.2 2.35 23.9 2.40 27.0 2.49

65 14.6 1.62 18.2 1.94 21.2 2.17 23.9 2.29 24.6 2.33 27.6 2.44

MUZ-GA24NA

75 10.2 1.26 13.5 1.59 16.8 1.87 20.1 2.09 22.6 2.19 23.3 2.23 26.4 2.31

70 11.0 1.21 14.3 1.54 17.4 1.83 20.5 2.03 23.2 2.14 23.9 2.18 27.0 2.27

65 11.6 1.16 14.6 1.48 18.2 1.77 21.2 1.98 23.9 2.09 24.6 2.12 27.6 2.23

NOTE: 1. IDB: Intake air dry-bulb temperature

TC: Total Capacity (×10

Btu/h)

TPC: Total Power Consumption (kW)

2. Above data is for heating operation without any frost.

How to operate with fixed operational frequency of the compressor.

1. Press the EMERGENCY OPERATION switch on the front of the indoor unit, and select either EMERGENCY COOL

mode or EMERGENCY HEAT mode before starting to operate the air conditioner.

2. The compressor starts with operational frequency.

3. The fan speed of the indoor unit is High.

4. This operation continues for 30 minutes.

5. In order to release this operation, press the EMERGENCY OPERATION switch twice or once, or press any button on

the remote controller.

7-2. PERFORMANCE CURVE

Total power consumption

(kW)

Total capacity

(10

Btu/h)

Outdoor intake air WB temperature (°F)

= 307 CFM

Airflow

1.0

15 25 35 45 55

0.8

0.6

0.7

0.9

Ind

oor intake air DB temperature (°F)

Indoor intak

e air DB temperature (°F)

Indoor intake air DB temperature (°F)

= 318 CFM

Airflow

15 25 35 45 55

Outdoor intake air WB temperature (°F)

1.3

0.8

0.9

1.0

1.1

1.2

Indoor intak

e air

DB temperat

ure (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

Cooling

Outdoor intake air DB temperature (°F)

SHF at rating condition = 0.71

= 275 CFM

Airflow

0.9

65 75 85 95 105 115

0.7

0.6

0.8

Indoor intak

e air WB temperat

ure (°F)

Indoor intake air WB temperature (°F)

0.5

0.4

Total power consumption

(kW)

Total capacity

(10

Btu/h)

2.5

2.3

2.1

1.9

1.7

1.5

Ind

oor intake air WB temperature (°F)

Indoor intake air WB temperature (°F)

SHF at rating condition = 0.65

= 342 CFM

Airflow

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

3.1

2.9

2.7

2.5

2.3

2.1

Indoor intake air WB temperature (°F)

Indoor intake air

WB temperature (°F)

SHF at rating condition = 0.63

= 508 CFM

Airflow

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

1.4

1.3

1.2

1.1

1.0

0.9

Indoor intake air WB temperature (°F)

SHF at rating condition = 0.70

= 318 CFM

Airflow

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

2.2

2.0

1.8

1.6

1.4

1.2

Indoor intake air WB temperature (°F)

Ind

oor intake air WB temperature (°F)

SHF at rating condition = 0.65

= 342 CFM

Airflow

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

MUZ-A09NA

MUZ-A12NA

MUZ-A15NA MUY-A15NA

MUZ-A17NA MUY-A17NA

MUZ-A24NA MUY-A24NA

Heating

MUZ-A12NA

MUZ-A09NA

MUZ-A09NA-

Outdoor intake air DB temperature (°F)

SHF at rating condition = 0.71

= 275 CFM

Airflow

0.9

65 75 85 95 105 115

0.7

0.6

0.8

Indoor intak

e air WB temperature (°F)

Indoor intake air WB temperature (°F

)

0.5

0.4

Total power consumption

(kW)

Total capacity

(10

Btu/h)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

Outdoor intake air WB temperature (°F)

= 307 CFM

Airflow

1.0

15 25 35 45 55

0.8

0.6

0.7

0.9

Indoor intake air DB temperat

ure

(°F)

Indoor intake air DB temperature (°F)

2.9

2.7

2.5

2.3

2.1

1.7

Indoor intake air WB temperature (°F)

Indoor intake air WB tempe

rat

ure (°F)

SHF at rating condition = 0.63

= 508 CFM

Airflow

65 75 85 95 105 115

Outdoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

MUZ-GA24NA MUY-GA24NA

Outdoor intake air WB temperature (°F)

Airflow= 381 CFM

1.8

1.9

1.7

15 25 35 45 55

1.5

1.3

1.4

1.6

Indoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(×10

Btu/h)

Indoor intake air DB temperature (°F)

= 381 CFM

Airflow

15 25 35 45 55

Outdoor intake air WB temperature (°F)

2.4

1.4

1.6

1.8

2.0

2.2

Indoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

2.6

1.6

Indoor intake air DB temperature (°F)

= 568 CFM

Airflow

15 25 35 45 55

Outdoor intake air WB temperature (°F)

1.8

2.0

2.2

2.4

Indoor intake air

DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

MUZ-A15NA

MUZ-A17NA

MUZ-A24NA

= 568 CFM

Airflow

15525354555

Outdoor intake air WB temperature (°F)

Indoor intake air DB temperature (°F)

Total power consumption

(kW)

Total capacity

(10

Btu/h)

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

Indoor intake air DB tem

perature

(°F)

MUZ-GA24NA

This value of frequency is not the same as the actual frequency in operating. Refer to 7-5 and 7-6 for the relationships

between frequency and capacity.

Data is based on the condition of indoor humidity 50%.

Air flow should be set to High speed.

7-3. Condensing pressure

Cooling

68 70 75 80 85 90 95 100 105

(°F)

110

115

120

125

130

135

140

145

150

155

160

165

170

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

68 70 75 80 85 90 95 100 105

(°F)

260

280

300

320

340

360

380

400

420

Indoor DB temperature (°F)

Outdoor ambient temperature

MUZ-A09NA

68 70 75 80 85 90 95 100 105

(°F)

100

105

110

115

120

125

130

135

140

145

150

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

68 70 75 80 85 90 95 100 105

(°F)

180

220

260

300

340

380

420

460

500

Indoor DB temperature (°F)

Outdoor ambient temperature

MUZ-A12NA

MUZ-A09NA

MUZ-A09NA-

(PSIG)

Condensing pressure

68 70 75 80 85 90 95 100 105

(°F)

280

300

340

360

380

400

420

460

480

Indoor DB temperature (°F)

Outdoor ambient temperature

320

68 70 75 80 85 90 95 100 105

(°F)

110

115

120

125

130

135

140

145

150

155

160

165

170

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

440

MUZ-A15NA

MUY-A15NA

68 70 75 80 85 90 95 100 105(°F)

100

105

110

115

120

125

130

135

140

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB

temperature (°F

)

(PSIG)

68 70 75 80 85 90 95 100 105(°F)

260

300

340

380

420

460

500

540

580

Ind

oor DB

temperature (°F)

Outdoor ambient temperature

MUZ-A24NA

MUY-A24NA

68 70 75 80 85 90 95 100 105(°F)

100

105

110

115

120

125

130

(PSIG)

Condensing pressure

Suction pressure

Outdoor ambient temperature

Indoor DB temperat

ure (°F)

(PSIG)

68 70 75 80 85 90 95 100 105(°F)

260

300

340

380

420

460

500

540

580

Indoor DB temperature (°F)

Outdoor ambient temperature

MUZ-A17NA

MUY-A17NA

(PSIG)

Condensing pressure

68 70 75 80 85 90 95 100 105(°F)

100

105

110

115

120

125

130

135

140

Suction pressure

Outdoor ambient temperature

Indoor DB temperature (°F)

(PSIG)

68 70 75 80 85 90 95 100 105(°F)

260

300

340

380

420

460

500

540

580

Indoor DB temperature (°F)

Outdoor ambient temperature

MUZ-GA24NA

MUY-GA24NA

(PSIG)

Condensing pressure

68 70 75 80 85 90 95 100 105(°F)

260

300

340

380

420

460

500

540

580

Indoor DB temperature (°F)

Outdoor ambient temperature

Suction pressure

68 70 75 80 85 90 95 100 105(°F)

Outdoor ambient temperature

(PSIG)

100

110

120

130

140

150

Data is based on the condition of outdoor humidity 75%.

Air flow should be set to High speed.

Data is for heating operation without any frost.

Heating

MUZ-A12NA

(PSIG) (PSIG)

Condensing pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55 60 65 70(°F)

340

320

300

280

260

240

360

380

400

440

420

460

480

Indoor DB temperature(°F)

Suction pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55

58Hz

60 65 70(°F)

100

110

120

130

140

150

160

170

Indoor DB temperature (°F)

(PSIG) (PSIG)

Condensing pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55 60 65 70(°F)

340

320

300

280

260

240

360

380

400

440

420

460

480

Indoor DB temperature(°F)

Suction pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55

58Hz

60 65 70(°F)

100

110

120

130

140

150

160

170

Indoor DB temperature (°F)

MUZ-A09NA

MUZ-A09NA-

(PSIG) (PSIG)

Condensing pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55 60 65 70(°F)

340

320

300

280

260

240

360

380

400

440

420

460

480

Indoor DB temperature(°F)

Suction pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55

58Hz

60 65 70(°F)

100

110

120

130

140

150

160

170

Indoor DB temperature (°F)

MUZ-A24NA

MUZ-A17NA

(PSIG) (PSIG)

Condensing pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55 60 65 70(°F)

260

220

180

140

100

300

340

380

460

420

500

540

580

620

Indoor DB temperature(°F)

Suction pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55

58Hz

60 65 70(°F)

100

110

120

130

140

150

160

Indoor DB temperature (°F)

(PSIG) (PSIG)

Condensing pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55 60 65 70(°F)

280

260

240

220

200

300

320

340

380

360

400

420

440

460

Indoor DB temperature(°F)

Suction pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55

58Hz

60 65 70(°F)

100

110

120

130

140

150

160

Indoor DB temperature (°F)

58Hz

MUZ-A15NA

(PSIG) (PSIG)

Condensing pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55 60 65 70(°F)

260

220

180

140

100

300

340

380

460

420

500

540

580

620

Indoor

DB temperature(°F)

Suction pressure

Outdoor ambient temperature

14 20 25 30 35 40 45 50 55

58Hz

60 65 70(°F)

100

110

120

130

140

150

160

Ind

oor

DB temperature (°F)

MUZ-GA24NA

(PSIG)

Condensing pressure

Suction pressure

200

220

240

260

280

300

320

340

360

380

(PSIG)

Outdoor ambient temperature

1552010 25 30 35 40 45 50 55 60 65 70(°F)

58Hz

Ind

oor

DB temperature(

°F)

100

110

120

130

140

150

160

170

58Hz

Indoor DB temperature (°F)

Outdoor ambient temperature

15 20105 25303540455055606570(°F)

7-4. STANDARD OPERATION DATA

Model MUZ-A09NA MSZ-A12NA

Item Unit Cooling Heating Cooling Heating Cooling Heating

Total

Capacity Btu/h 9,000 10,900 9,000 10,900 12,000 13,600

SHF — 0.71 — 0.71 — 0.70 —

Input kW 0.690 0.860 0.690 0.860 1,170 1,160

Rated frequency Hz 50 61 50 63 76 76

Electrical circuit

Indoor unit MSZ-A09NA MSZ-A12NA

Power supply (V, Phase, Hz) 208 / 230, 1, 60 208 / 230, 1, 60

Input kW 0.016 0.021

Fan motor current A 0.18 / 0.16 0.23 / 0.21

Outdoor unit

MUZ-A09NA

MUZ-A09NA-

MUZ-A12NA

Power supply (V, phase, Hz) 208 / 230, 1, 60 208 / 230, 1, 60

Input kW 0.674 0.844 0.674 0.844 1.149 1.139

Comp. current A

2.80 / 2.53 3.63 / 3.28 3.14 / 2.84 3.89 / 3.52

5.08 / 4.59 5.03 / 4.54

Fan motor current A 0.37 / 0.34 0.33 / 0.30 0.37 / 0.34

Refrigerant circuit

Condensing pressure

PSIG

363 368 393 372 395 393

Suction pressure

PSIG

144 109 144 102 124 103

Discharge temperature °F 145 153 155 165 169 164

Condensing temperature °F 107 108 113 109 112 113

Suction temperature °F 55 37 56 38 54 35

Comp. shell bottom temp °F 140 147 149 159 163 158

Ref. pipe length ft. 25 25

Refrigerant charge (R410A) — 2 lb. 5 oz. 2 lb. 2 lb. 5 oz.

Indoor unit

Intake air temperature

DB °F 80 70 80 70 80 70

WB °F 67 60 67 60 67 60

Discharge air temperature

DB °F 57 105 57 105 56 108

WB °F 56 71 56 71 54 72

Fan speed (High) rpm 1,080 1,080 1,080 1,080 1,220 1,220

AirÀ ow (High)

CFM 275 (Wet)

307

275 (Wet)

307 318 (Wet) 353

Outdoor unit

Intake air temperature

DB °F 95 47 95 47 95 47

WB °F — 43 — 43 — 43

Fan speed rpm 840 840 840 840 840 840

AirÀ ow

CFM

1,094 1,094 1,129 1,129 1,094 1,094

Model

MSZ-A15NA

MSY-A15NA

MSZ-A15NA

MSZ-A17NA

MSY-A17NA

MSZ-A17NA

Item Unit Cooling Heating Cooling Heating

Total

Capacity Btu/h 15,000 18,000 16,200 20,100

SHF - 0.65 — 0.65 —

Input kW 1.69 1.79 2.07 2.15

Rated frequency Hz 77 78 89 88

Electrical circuit

Indoor unit MSZ-A15NA, MSY-A15NA MSZ-A17NA, MSY-A17NA

Power supply (V, Phase, Hz) 208 / 230, 1, 60 208 / 230, 1, 60

Input kW 0.030 0.030

Fan motor current A 0.31 / 0.28 0.31 / 0.28

Outdoor unit

MUZ-A15NA

MUY-A15NA

MUZ-A15NA

MUZ-A17NA

MUY-A17NA

MUZ-A17NA

Power supply (V, phase, Hz) 208 / 230, 1, 60 208 / 230, 1, 60

Input kW 1.660 1.760 2.040 2.120

Comp. current A 7.56 / 6.84 8.14 / 7.36 9.43 / 8.52 9.93 / 8.98

Fan motor current A 0.42 / 0.38 0.42 / 0.38

Refrigerant circuit

Condensing pressure

PSIG

425 458 442 493

Suction pressure

PSIG

115 95 106 92

Discharge temperature °F 182 180 189 194

Condensing temperature °F 117 125 120 130

Suction temperature °F 47 30 40 28

Comp. shell bottom temp °F 161 153 167 167

Ref. pipe length ft. 25 25

Refrigerant charge (R410A) - 2 lb. 7 oz. 2 lb. 7 oz.

Indoor unit

Intake air temperature

DB °F 80 70 80 70

WB °F 67 60 67 60

Discharge air temperature

DB °F 53 116 52 120

WB °F 52 74 51 75

Fan speed (High) rpm 1,300 1,300 1,300 1,300

AirÀ ow (High)

CFM

342 (Wet) 381 342 (Wet) 381

Outdoor unit

Intake air temperature

DB °F 95 47 95 47

WB °F — 43 — 43

Fan speed rpm 950 950 950 950

AirÀ ow

CFM

1,249 1,249 1,249 1,249

Model

MSZ-A24NA

MSY-A24NA

MSZ-A24NA

MSZ-GA24NA

MSY-GA24NA

MSZ-GA24NA

Item Unit Cooling Heating Cooling Heating

Total

Capacity Btu/h 22,000 23,200 22,000 23,200

SHF - 0.63 — 0.63 —

Input kW 2.88 2.35 2.50 2.14

Rated frequency Hz 110 101 101 96

Electrical circuit

Indoor unit MSZ-A24NA, MSY-A24NA MSZ-GA24NA, MSY-GA24NA

Power supply (V, Phase, Hz) 208 / 230, 1, 60

Input kW 0.053

Fan motor current A 0.52 / 0.47

Outdoor unit

MUZ-A24NA

MUY-A24NA

MUZ-A24NA

MUZ-GA24NA

MUY-GA24NA

MUZ-GA24NA

Power supply (V, phase, Hz) 208 / 230, 1, 60

Input kW 2.827 2.297 2.447 2.087

Comp. current A 12.81 / 11.59 11.10 / 10.04 10.82 / 9.78 9.32 / 8.43

Fan motor current A 0.80 / 0.72 0.80 / 0.72 0.64 / 0.59

Refrigerant circuit

Condensing pressure

PSIG

447 401 413 375

Suction pressure

PSIG

107 92 130 103

Discharge temperature °F 181 170 168 173

Condensing temperature °F 121 115 119 112

Suction temperature °F 37 29 43 31

Comp. shell bottom temp °F 161 148 160 164

Ref. pipe length ft. 25

Refrigerant charge (R410A) - 4 lb.

Indoor unit

Intake air temperature

DB °F 80 70 80 70

WB °F 67 60 67 60

Discharge air temperature

DB °F 56 108 56 108

WB °F 55 72 55 72

Fan speed (High) rpm 1,310

AirÀ ow (High)

CFM

385 (Wet) 341 385 (Wet) 341

Outdoor unit

Intake air temperature

DB °F 95 47 95 47

WB°F—43—43

Fan speed rpm 800 740

AirÀ ow

CFM

1,729 1,660

7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY

Correction of Cooling total input

Input correction factors

The operational frequency of compressor

Correction of Cooling capacity

Capacity correction factors

The operational frequency of compressor

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

Correction of Heating total input

The operational frequency of compressor

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

Correction of Heating capacity

Capacity correction factors

The operational frequency of compressor

Input correction factors

MUZ-A09NA

MUZ-A09NA -

MUZ-A12NA

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

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

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

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequenc

of compressor

Correction of Heating capacity

The operational frequenc

of compressor

MUY-A15NA

MUZ-A15NA

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz) (Hz)

0 50 100 150

0.0

0.5

1.0

1.5

MUZ-A09NA -

MUZ-A09NA - U2

Correction of Cooling total input

Input correction factors

The operational frequency of compressor

Correction of Cooling capacity

Capacity correction factors

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

Capacity correction factors

The operational frequency of compressor

Input correction factors

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

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

0 50 100 150(Hz)

0.0

0.5

1.0

1.5

2.0

MUY-A24NA

MUZ-A24NA

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

050100

150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

MUY-GA24NA

MUZ-GA24NA

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

050100

150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

Capacity correction factors

Input correction factors

Capacity correction factors

Correction of Cooling capacity

The operational frequency of compressor

Correction of Cooling total input

The operational frequency of compressor

Correction of Heating total input

The operational frequency of compressor

Correction of Heating capacity

The operational frequency of compressor

MUY-A17NA

MUZ-A17NA

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

0 50 100 150

0.0

0.5

1.0

1.5

(Hz)

7-6. TEST RUN OPERATION (How to operate fixed-frequency operation)

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

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

3. Compressor operates at rated frequency in COOL mode or 58 Hz 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 EMERGENCY OPERATION switch or any button on

remote controller.

OFF

Outdoor fan

motor

Compressor

5 seconds 15 seconds

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA

MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

8-2. R.V. COIL CONTROL(MUZ)

Heating

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

Cooling

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

OFF

Dry

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

OFF

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

OFF

Compressor

Outdoor fan

motor

R.V.coil

<MUZ-A09/12/15/17>

OFF

<COOL>

5 seconds

<HEAT>

5 seconds

ON or OFF

R.V.coil

<MUZ-A24,MUZ-GA24>

OFF

ON or OFF

8-1. OUTDOOR FAN MOTOR CONTROL

The fan motor turns ON/OFF, interlocking with the compressor.

[ON] The fan motor turns ON 5 seconds before the compressor starts up.

[OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

<MUZ-A09/12/15/17, MUY-A15/17>

Sensor Purpose

Actuator

Compressor LEV

Outdoor fan

motor

R.V. coil

Indoor fan

motor

Discharge temperature thermistor

Protection

żż

Indoor coil temperature thermistor

Cooling: Coil frost prevention

Heating: High pressure protection

żż

Defrost thermistor

Cooling: High pressure protection

żż

Heating: Defrosting

żżżżż

Fin temperature thermistor Protection

żż

Ambient temperature thermistor

Cooling: Low ambient temperature operation

żżż

<MUZ-A24, MUY-A24, MUZ-GA24, MUY-GA24>

Sensor Purpose

Actuator

Compressor LEV

Outdoor fan

motor

R.V. coil

Indoor fan

motor

Discharge temperature thermistor

Protection

żż

Indoor coil temperature thermistor

Cooling: Coil frost prevention

Heating: High pressure protection

żż

Defrost thermistor (MUZ) Defrosting

żżżżż

Fin temperature thermistor Protection

żż

Outdoor heat exchanger temperature

High pressure protection

żżż

Ambient temperature thermistor

Cooling: Low ambient temperature

operation

żżż

ACTUATOR CONTROL

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 10-6.1.)

Jumper wire

Defrost ¿ nish temperature °F (°C)

MUZ-A09/12NA MUZ-A15/17NA

Soldered (Initial setting) 50 (10) 41 (5)

None (Cut) 55 (13) 46 (8)

TROUBLESHOOTING

10-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for miswiring.

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and after con-

firming 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 of 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

Housing point

Incorrect

Correct

3. Troubleshooting procedure

1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormal-

ity. To make sure, check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting

service work.

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

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

components for bursting and discoloration.

4) Refer to 10-2 and 10-3.

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA

MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA

SERVICE FUNCTIONS

This figures show about MSZ-A09/12/15/17.

Outline of the function

This air conditioner can memorize the abnormal condition which has occurred once.

Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure details

can be recalled.

This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.

10-2. FAILURE MODE RECALL FUNCTION

1. Flow chart of failure mode recall function for the indoor/outdoor unit

2. Blinking pattern when the indoor unit is abnormal:

3.Blinking pattern when the outdoor unit is abnormal:

OFF

Beeps

Repeated cycle Repeated cycle

OFF

No beep Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5-

second interval

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5-

second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

Beeps

Does the left lamp of OPERATION INDICATOR lamp on the

indoor unit blink at the interval of 0.5 seconds?

Blinks: Either indoor or outdoor unit is abnormal. Beep is emit-

ted at the same timing as the blinking of the left lamp

of OPERATION INDICATOR lamp. 2

Indoor unit is normal.

But the outdoor unit might be abnormal because there are some abnor-

malities that can not be recalled with this way.

Con¿ rm if outdoor unit is abnormal according to the detailed outdoor

unit failure mode recall function. (Refer to 10-2.2)

Yes

The cause of abnormality cannot be found because the abnormality does not recur.

Setting up the failure mode recall function

Turn ON the power supply.

While pressing both OPERATION SELECT button and TOO COOL button on the

remote controller at the same time, press RESET button.

First, release RESET button.

Hold down the other two buttons for another 3 seconds. Con¿ rm that the indicators on

the LCD screen shown in the right ¿ gures are all displayed. Then release the buttons.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature

is displayed) with the remote controller headed towards the indoor unit. 1

Judgment of indoor/outdoor abnormality

Before blinking, does the left lamp of OPERATION INDICA-

TOR lamp stay ON for 3 seconds?

Stays ON for 3 seconds (without beep):

The outdoor unit is abnormal.

The indoor unit is abnormal.

Check the blinking pattern, and con¿ rm the abnormal point with the indoor unit

failure mode table. (Refer to indoor unit service manual.)

Make sure to check at least two consecutive blinking cycles. 2

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.

Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

The outdoor unit is abnormal.

Check the blinking pattern, and con¿ rm the abnormal point with the

outdoor unit failure mode table. (Refer to 10-2.3)

Make sure to check at least two consecutive blinking cycles. 3

Repair the defective parts.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall

function" mentioned above.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)

with the remote controller headed towards the indoor unit.

Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

Operational procedure

Yes

(Blinks)

(OFF)

NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

1. Regardless of normal or abnormal condition, a short

beep is emitted once the signal is received.

Does left lamp of OPERATION INDICATOR lamp on

the indoor unit blink at the interval of 0.5 seconds?

Blinks: The outdoor unit is abnormal. Beep is emitted

at the same timing as the blinking of the left

lamp of OPERATION INDICATOR lamp.

Yes

(Blinks

)

(OFF)

The outdoor unit might be abnormal.

Con¿ rm if outdoor unit is abnormal according to the following procedures.

Operational procedure

Con¿ rm that the remote controller is in the failure mode recall function.

With the remote controller headed towards the indoor unit, press TOO

COOL or TOO WARM button to adjust the set temperature to 77ÛF (25ÛC).

1. Regardless of normal or abnormal condition, 2 short

beeps are emitted as the signal is received.

The outdoor unit is abnormal.

Check the blinking pattern, and con¿ rm the abnormal point with the out-

door unit failure mode table. (10-2.3.)

Make sure to check at least two consecutive blinking cycles. 2

Releasing the failure mode recall function

Release the failure mode recall function by the following procedures.

Turn OFF the power supply and turn it ON again.

Press RESET button of the remote controller.

Repair the defective parts.

The outdoor unit is normal.

Release the failure mode recall function accord-

ing to the left mentioned procedure.

Deleting the memorized abnormal condition

After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall

function" (10-2.1.).

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)

with the remote controller headed towards the indoor unit.

Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.

Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

2. Flow chart of the detailed outdoor unit failure mode recall function

2.Blinking pattern when outdoor unit is abnormal:

OFF

No beep

Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

3. Outdoor unit failure mode table

MUZ-A09/12/15/17NA MUY-A15/17NA

The left lamp of

OPERATION INDICATOR

lamp (Indoor unit)

Abnormal point

(Failure mode/protection)

LED indication

(Outdoor P.C. board)

Condition Remedy

Indoor/outdoor

unit failure

mode recall

function

Outdoor unit

failure mode

recall function

OFF None (Normal)

—— ———

2-time À ash

2.5 seconds OFF

Outdoor power system

—

Overcurrent protection stop is

continuously performed 3 times within

1 minute after the compressor gets

started.

• Reconnect

connectors.

• Refer to 10-5.

"How

to check inverter/

compressor".

• Check stop valve.

żż

3-time À ash

2.5 seconds OFF

Discharge temperature

thermistor

1-time À ash every

2.5 seconds

Thermistor shorts or opens during

compressor running.

• Refer to 10-5.

"Check of outdoor

thermistors".

Defective outdoor

thermistors can be

identi¿ ed by checking

the blinking pattern of

LED.

żż

Defrost thermistor (MSZ)

Fin temperature thermistor 3-time À ash

2.5 seconds OFF

P.C. board temperature

thermistor

4-time À ash

2.5 seconds OFF

Ambient temperature

thermistor

2-time À ash

2.5 seconds OFF

4-time À ash

2.5 seconds OFF

Overcurrent 11-time À ash

2.5 seconds OFF

24 A (09/12) / 26.5 A (15/17) current

À ows into intelligent power module.

• Reconnect

compressor

connector.

• Refer to 10-5. "How

to check inverter/

compressor".

• Check stop valve.

—

Compressor synchronous

abnormality (Compressor

start-up failure protection)

12-time À ash

2.5 seconds OFF

Waveform of compressor current is

distorted.

• Reconnect

compressor

connector.

• Refer to 10-5.

"How

to check inverter/

compressor".

—

5-time À ash

2.5 seconds OFF

Discharge temperature

—

Temperature of discharge temperature

thermistor exceeds 241°F (116°C),

compressor stops.

Compressor can restart if discharge

temperature thermistor reads 212°F

(100°C) or less 3 minutes later.

• Check refrigerant

circuit and refrigerant

amount.

• Refer to 10-5.

"Check of LEV".

—

6-time À ash

2.5 seconds OFF

High pressure

—

Indoor coil thermistor temperature

exceeds 158°F (70°C) in HEAT mode.

(MUZ)

Defrost thermistor exceeds 158°F (70°

C) in COOL mode.

• Check refrigerant

circuit and refrigerant

amount.

• Check stop valve.

—

7-time À ash

2.5 seconds OFF

Fin temperature / P.C. board

temperature

7-time À ash

2.5 seconds OFF

Temperature of ¿ n temperature

thermistor on the inverter P.C. board

exceeds 180°F (82°C) (09/12) /188°

F (86.5°C) (15/17), or temperature of

P.C. board temperature thermistor on

the inverter P.C. board exceeds 176°F

(80°C).

• Check around outdoor

unit.

• Check outdoor unit air

passage.

• Refer to 10-5.

"Check of outdoor fan

motor".

—

8-time À ash

2.5 seconds OFF

Outdoor fan motor

—

Outdoor fan has stopped 3 times in a

row within 30 seconds after outdoor

fan start-up.

• Refer to 10-5.

"Check of outdoor fan

motor".

• Refer to 10-5.

"Check of inverter P.C.

board".

—

9-time À ash

2.5 seconds OFF

Nonvolatile memory data 5-time À ash

2.5 seconds OFF

Nonvolatile memory data cannot be

read properly.

• Replace the inverter

P.C. board.

żż

10-time À ash

2.5 seconds OFF

Discharge temperature

—

Temperature of discharge temperature

thermistor has been 122°F (50°C) or

less for 20 minutes.

• Refer to 10-5.

"Check of LEV".

• Check refrigerant

circuit and refrigerant

amount.

—

11-time À ash

2.5 seconds OFF

DC voltage 8-time À ash

2.5 seconds OFF

DC voltage of inverter cannot be

detected normally.

• Refer to 10-5. "How

to check inverter/

compressor".

—

Each phase current of

compressor

9-time À ash

2.5 seconds OFF

Each phase current of compressor

cannot be detected normally.

12-time À ash

2.5 seconds OFF

Overcurrent

Compressor open-phase

10-time À ash

2.5 seconds OFF

24 A (09/12) / 26.5 A (15/17) current

À ows into intelligent power module

(IPM).

The open-phase operation of

compressor is detected.

The interphase short out occurs in the

output of the intelligent power module

(IPM).

The compressor winding shorts out.

• Reconnect

compressor

connector.

• Refer to 10-5. "How

to check inverter/

compressor"

—

14-time À ash

2.5 seconds OFF

Outdoor unit

(Other abnormality)

—

The inverter P.C. board is defective. • Replace the inverter

P.C. board.

—

NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-3.).

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

The left lamp of

OPERATION INDICATOR

lamp (Indoor unit)

Abnormal point

(Failure mode/protection)

LED indication

(Outdoor P.C. board)

Condition Remedy

Indoor/outdoor

unit failure

mode recall

function

LED1 LED2

OFF None (Normal)

Lighting Lighting — — —

2-time À ash

Outdoor power system Lighting Lighting IPM protection stop or lock protection stop is

continuously performed 3 times within 1 minute

after the compressor gets started, or converter

protection stop or bus-bar voltage protection

stop is continuously performed 3 times within 3

minutes after start-up.

• Check the connection of the

compressor connecting wire.

• Refer to 10-5. "How to

check inverter/compressor".

• Check the stop valve.

3-time À ash

Discharge temperature

thermistor

Lighting Once Thermistor shorts or opens during compressor

running.

• Refer to 10-5. "Check of

outdoor thermistors".

Defrost thermistor (MUZ) Lighting Once

Ambient temperature

thermistor

Lighting Twice

Fin temperature thermistor Lighting 3 times

P.C. board temperature

thermistor

Lighting 4 times • Replace the outdoor

electronic control P.C. board.

Outdoor heat exchanger

temperature thermistor

Lighting 9 times • Refer to 10-5. "Check of

outdoor thermistors".

4-time À ash

Overcurrent Once Goes out 28 A current À ows into intelligent power module. • Reconnect compressor

connector.

• Refer to 10-5.

"How to

check inverter/compressor.

• Check the stop valve.

—

5-time À ash

Discharge temperature Lighting Lighting Discharge temperature exceeds 241°F (116°

C) during operation. Compressor can restart if

discharge temperature thermistor reads 212°F

(100°C) or less 3 minutes later.

• Check refrigerant circuit and

refrigerant amount.

• Refer to 10-5. "Check of

LEV".

—

6-time À ash

High pressure Lighting Lighting The outdoor heat exchanger temperature

exceeds 158°F (70°C) during cooling or the

indoor gas pipe temperature exceeds 158°F (70

°C) during heating.

• Check refrigerant circuit and

refrigerant amount.

• Check the stop valve.

—

7-time À ash

Fin temperature 3 times Goes out The ¿ n temperature exceeds 189°F (87°C)

during operation.

• Check around outdoor unit.

• Check outdoor unit air

passage.

• Refer to 10-5.

"Check of

outdoor fan motor".

—

P.C. board temperature 4 times Goes out The P.C. board temperature exceeds 158°F (70°

C) during operation.

8-time À ash

Outdoor fan motor Lighting Lighting Failure occurs continuously three times within

30 seconds after the fan gets started.

• Refer to 10-5. "Check of

outdoor fan motor".

—

9-time À ash

Nonvolatile memory data Lighting 5 times Nonvolatile memory data cannot be read

properly.

• Replace the outdoor

electronic control P.C. board.

10-time À ash

Discharge temperature Lighting Lighting The frequency of the compressor is kept 80 Hz

or more and the discharge temperature is kept

under 102°F (39°C) for more than 20 minutes.

• Check refrigerant circuit and

refrigerant amount.

• Refer to 10-5.

"Check of

LEV".

—

11-time À ash Communication error between

P.C. boards

Lighting 6 times Communication error occurs between the

electronic control P.C. board and power board

for more than 10 seconds.

•

Check the connecting wire

between outdoor electronic

control P.C. board and

power board.

—

The communication between boards protection

stop is continuously performed twice.

Current sensor Lighting 7 times A short or open circuit is detected in the current

sensor during compressor operating.

•

Replace the power board.

—

Current sensor protection stop is continuously

performed twice.

Zero cross detecting circuit 5 times Goes out Zero cross signal cannot be detected while the

compressor is operating.

•

Check the connecting wire

among electronic control

P.C. board, noise ¿ lter P.C.

board and power board.

—

The protection stop of the zero cross detecting

circuit is continuously performed 10 times.

Converter 5 times Goes out A failure is detected in the operation of the

converter during operation.

• Check the voltage of power

supply.

•

Replace the power board.

—

Bus-bar voltage

(1)

5 times Goes out The bus-bar voltage exceeds 400 V or falls to

200 V or below during compressor operating.

Bus-bar voltage

(2)

Even if this protection stop

is performed continuously

3 times, it does not mean

the abnormality in outdoor

power system.

6 times Goes out The bus-bar voltage exceeds 400 V or falls to 50

V or below during compressor operating.

• Check the voltage of power

supply.

• Replace the outdoor

electronic control P.C. board.

NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.).

MUZ-A09/12/15/17NA MUY-A15/17NA

No. Symptom LED indication

Abnormal point/Condition

Condition Remedy

Outdoor unit

does not oper-

ate.

1-time À ash every

2.5 seconds

Outdoor power sys-

tem

Overcurrent protection stop is continuously performed 3 times

within 1 minute after the compressor gets started.

•

Reconnect connector of compressor.

•

Refer to 10-5. "How to check in-

verter/compressor".

•

Check stop valve.

Outdoor thermistors Discharge temperature thermistor, ¿ n temperature thermistor,

defrost thermistor (MUZ), P.C. board temperature thermistor or

ambient temperature thermistor shorts or opens during com-

pressor running.

•

Refer to 10-5. "Check of outdoor

thermistors".

Outdoor control sys-

tem

Nonvolatile memory data cannot be read properly. Replace inverter P.C. board.

6-time À ash

2.5 seconds OFF

Serial signal The communication fails between the indoor and outdoor unit

for 3 minutes.

•

Refer to 10-5. "How to check

miswiring and serial signal error".

14-time À ash

2.5 seconds OFF

Outdoor unit

(Other abnormality)

Outdoor unit is defective. Refer to 10-2.2. "Flow chart of the

detailed outdoor unit failure mode

recall function".

'Outdoor unit

stops and

restarts 3 min-

utes later' is

repeated.

2-time À ash

2.5 seconds OFF

Overcurrent protec-

tion

24 A (09/12) / 26.5 A (15/17) current À ows into intelligent power

module.

• Reconnect connector of compressor.

•

Refer to 10-5. "How to check in-

verter/compressor"

•

Check stop valve.

3-time À ash

2.5 seconds OFF

Discharge tempera-

ture overheat protec-

tion

Temperature of discharge temperature thermistor exceeds 241

°F (116°C) compressor stops. Compressor can restart if dis-

charge temperature thermistor reads 212°F (100°C) or less 3

minutes later.

•

Check refrigerant circuit and refrig-

erant amount.

•

Refer to 10-5. "Check of LEV".

4-timeÀ ash

2.5 seconds OFF

Fin temperature/

P.C. board tempera-

ture thermistor over-

heat protection

Temperature of ¿ n temperature thermistor on the heat sink

exceeds 180°F (82°C) (09/12) / 188°F (86.5°C) (15/17) or tem-

perature of P.C. board temperature thermistor on the inverter

P.C. board exceeds 176°F (80°C).

•

Check around outdoor unit.

•

Check outdoor unit air passage.

•

Refer to 10-5. "Check of outdoor

fan motor".

5-time À ash

2.5 seconds OFF

High pressure pro-

tection

Indoor coil thermistor exceeds 158°F (70°C) in HEAT mode.

(MUZ)

Defrost thermistor exceeds 158°F (70°C) in COOL mode.

•

Check refrigerant circuit and refrig-

erant amount.

•

Check stop valve.

8-time À ash

2.5 seconds OFF

Compressor syn-

chronous abnormal-

ity

The waveform of compressor current is distorted.

•

Reconnect connector of compressor.

•

Refer to 10-5. "How to check in-

verter/compressor"

10-time À ash

2.5 seconds OFF

Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds

after outdoor fan start-up.

•

Refer to 10-5. "Check of outdoor

fan motor".

•

Refer to 10-5. "Check of inverter

P.C. board".

12-timeÀ ash

2.5 seconds OFF

Each phase current

of compressor

Each phase current of compressor cannot be detected nor-

mally.

• Refer to 10-5.

"How to check

inverter/compressor"

13-time À ash

2.5 seconds OFF

DC voltage DC voltage of inverter cannot be detected normally.

•

Refer to 10-5. "How to check in-

verter/compressor".

Outdoor unit

operates.

1-time À ash

2.5 seconds OFF

Frequency drop by

current protection

Current from power outlet exceeds 9.2 A (09/12) / 11.1 A

(15/17) compressor frequency lowers.

The unit is normal, but check the fol-

lowing.

•

Check if indoor ¿ lters are clogged.

•

Check if refrigerant is short.

•

Check if indoor/outdoor unit air cir-

culation is short cycled.

3-time À ash

2.5 seconds OFF

Frequency drop by high

pressure protection

Temperature of indoor coil thermistor exceeds 131°F (55°C) in

HEAT mode (MUZ), compressor frequency lowers.

Frequency drop by de-

frosting in COOL mode

Indoor coil thermistor reads 46°F (8°C) or less in COOL mode,

compressor frequency lowers.

4-time À ash

2.5 seconds OFF

Frequency drop by

discharge tempera-

ture protection

Temperature of discharge temperature thermistor exceeds 232

°F (111°C), compressor frequency lowers.

•

Check refrigerant circuit and refrig-

erant amount.

•

Refer to 10-5. "Check of LEV".

•

Refer to 10-5. "Check of outdoor

thermistors".

Outdoor unit

operates.

7-time À ash

2.5 seconds OFF

Low discharge tem-

perature protection

Temperature of discharge temperature thermistor has been

122°F (50°C) or less for 20 minutes.

•

Refer to 10-5. "Check of LEV".

•

Check refrigerant circuit and refrig-

erant amount.

8-time À ash

2.5 seconds OFF

PAM protection

PAM:

Pulse

Amplitude

Modulation

The overcurrent À ows into IGBT (Insulated Gate Bipolar tran-

sistor: TR821) or when the bus-bar voltage reaches 320 V or

more, PAM stops and restarts.

This is not malfunction.

PAM protection will be activated in

the following cases:

lnstantaneous power voltage drop

(Short time power failure)

When the power supply voltage is high.

9-time À ash

2.5 seconds OFF

Inverter check mode The connector of compressor is disconnected, inverter check

mode starts.

Check if the connector of the com-

pressor is correctly connected.

Refer to 10-5. "How to check in-

verter/compressor".

NOTE: 1. The location of LED is illustrated at the right ¿ gure. Refer to 10-6.1.

2. LED is lighted during normal operation.

The À ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) When the À ashing frequency is "2".

Inverter P.C. board (Parts side)

LED

Flashing

OFF

2.5-second OFF

0.5-second ON 0.5-second ON

10-3. TROUBLESHOOTING CHECK TABLE

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

No. Symptom

LED indication

Abnormal point/

Condition

Condition Remedy

LED1(Red)

LED2(Yellow)

Outdoor unit

does not oper-

ate.

Lightning

Twice

Outdoor power system

Overcurrent protection stop is continuously performed 3 times

within 1 minute after the compressor gets started, or converter

protection stop or bus-bar voltage protection stop is continu-

ously performed 3 times within 3 minutes after start-up.

• Check the connection of the com-

pressor connecting wire.

• Refer to 10-5. "How to check in-

verter/compressor".

• Check the stop valve.

Lightning

3 times

Discharge temperature

thermistor

A short circuit is detected in the thermistor during operation, or

when an open circuit is detected in the thermistor after 10 min-

utes of compressor start-up.

• Refer to 10-5.

"Check of outdoor

thermistors".

Lightning

4 times

Fin temperature ther-

mistor

A short or open circuit is detected in the thermistor during op-

eration.

• Refer to 10-5.

"Check of outdoor

thermistors".

• Replace the outdoor electronic

control P.C. board.

Lightning

5 times

Ambient temperature

thermistor

A short or open circuit is detected in the thermistor during op-

eration.

• Refer to 10-5.

"Check of outdoor

thermistors".

Outdoor heat exchanger

temperature thermistor

A short circuit is detected in the thermistor during operation, or

an open circuit is detected in the thermistor after 5 minutes (in

cooling) and 10 minutes (in heating) of compressor start-up.

Defrost thermistor

(MUZ)

A short circuit is detected in the thermistor during operation, or

an open circuit is detected in the thermistor after 5 minutes of

compressor stat-up.

Lightning

6 times

Serial signal The communication fails between the indoor and outdoor unit 3

minutes.

• Refer to 10-5.

"How to check

miswiring and serial signal error.

Lightning

7 times

Nonvolatile memory

data

The nonvolatile memory data cannot be read properly. • Replace the outdoor electronic

control P.C. board.

Lightning

8 times

Current sensor Current sensor protection stop is continuously performed twice. • Replace the power board.

Lightning

11 times

Communication error

between P.C. boards

The communication protection stop between boards is continu-

ously performed twice.

• Check the connecting wire be-

tween outdoor electronic control

P.C. board and power board.

Lightning

12 times

Zero cross detecting

circuit

The protection stop of the zero cross detecting circuit is con-

tinuously performed 10 times.

• Check the connecting wire among

outdoor electronic control P.C.

board, noise ¿ lter P.C. board and

power board.

'Outdoor unit

stops and

restarts 3 min-

utes later' is

repeated.

Twice Goes out

lPM protection Overcurrent is detected after 30 seconds of compressor start-

up.

• Reconnect compressor connector.

• Refer to 10-5.

"How to check in-

verter/compressor".

• Check the stop valve.

• Check the power module (PAM

module).

Lock protection Overcurrent is detected within 30 seconds of compressor start-

up.

11 3 times Goes out

Discharge tempera-

ture protection

Discharge temperature exceeds 241°F (116°C) during opera-

tion and compressor stops. Compressor can restart if discharge

temperature thermistor reads 212°F (100°C) or less 3 minutes

later.

• Check the amount of gas and re-

frigerant circuit.

• Refer to 10-5. "Check of LEV".

12 4 times Goes out

Fin temperature pro-

tection

The ¿ n temperature exceeds 189°F (87°C) during operation. • Check around outdoor unit.

• Check outdoor unit air passage.

• Refer to 10-5. "Check of outdoor

fan motor".

P.C. board temperature

protection

The P.C. board temperature exceeds 158°F (70°C) during op-

eration.

13 5 times Goes out

High-Pressure pro-

tection

The outdoor heat exchanger temperature exceeds 158°F (70°

C) during cooling or indoor gas pipe temperature exceeds 158°

F (70°C) during heating (MUZ).

• Check the amount of gas and the

refrigerant circuit.

• Check the stop valve.

14 8 times Goes out

Converter protection A failure is detected in the operation of the converter during op-

eration.

• Replace the power board.

15 9 times Goes out

Bus-bar voltage pro-

tection (1)

The bus-bar voltage exceeds 400 V or falls to 200 V or below

during compressor operating.

• Check the voltage of power supply.

• Replace the power board or the

outdoor electronic control P.C.

board.

• Refer to 10-5. "Check of bus-bar

voltage".

Bus-bar voltage pro-

tection (2)

The bus-bar voltage exceeds 400 V or falls to 50 V or below

during compressor operating.

16 13 times Goes out

Outdoor fan motor Failure occurs continuously three times within 30 seconds after

the fan gets started.

• Refer to 10-5. "Check of outdoor

fan motor".

17 Lighting 8 times

Current sensor pro-

tection

A short or open circuit is detected in the current sensor during

compressor operating.

• Replace the power board.

18 Lighting 11 times

Communication be-

tween P.C. boards

protection

Communication error occurs between the outdoor electronic

control P.C. board and power board for more than 10 seconds

• Check the connecting wire be-

tween outdoor electronic control

P.C. board and power board.

19 Lighting 12 times

Zero cross detecting

circuit protection

Zero cross signal cannot be detected while the compressor is

operating.

• Check the connecting wire among

outdoor electronic control P.C.

board, noise ¿ lter P.C. board and

power board.

NOTE: 1. The location of LED is illustrated at the right ¿ gure. Refer to 10-6.3.

2. LED is lighted during normal operation.

The À ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) When the À ashing frequency is “2”.

Outdoor electronic control P.C. board(Parts side)

Lighting

LED2

LED1

The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.

(Example) When the flashing frequency is “2”.

OFF

2.5-second OFF

0.5-second ON

No. Symptom

LED indication

Abnormal point/

Condition

Condition Remedy

LED1(Red)

LED2(Yellow)

Outdoor unit

operates.

Once

Lighting

Primary current pro-

tection

The input current exceeds 15 A. These symptoms do not mean any

abnormality of the product, but

check the following points.

• Check if indoor ¿ lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air

circulation is short cycled.

Secondary current pro-

tection

The current of the compressor exceeds 15 A.

Twice

Lighting

High-Pressure protec-

tion (MUZ)

The indoor gas pipe temperature exceeds 113°F (45°C) during

heating.

Defrosting in cooling

The indoor gas pipe temperature falls 37°F (3°C) or below dur-

ing cooling.

3 times

Lighting

Discharge temperature

protection

The discharge temperature exceeds 212°F (100°C) during op-

eration.

• Check refrigerant circuit and refrig-

erant amount.

• Refer to 10-5.

"Check of LEV".

• Refer to 10-5. "Check of outdoor

thermistors".

4 times

Lighting

Low discharge tem-

perature protection

The frequency of the compressor is kept 80 Hz or more and

the discharge temperature is kept under 102°F (39°C) for more

than 20 minutes.

• Refer to 10-5. "Check of LEV".

• Check refrigerant circuit and refrig-

erant amount.

5 times

Lighting

Cooling high-pressure

protection

The outdoor heat exchanger temperature exceeds 136°F (58°

C) during operation.

This symptom does not mean any

abnormality of the product, but

check the following points.

• Check if indoor ¿ lters are clogged.

• Check if refrigerant is short.

• Check if indoor/outdoor unit air

circulation is short cycled.

Outdoor unit

operates

9 times

Lighting

Inverter check mode The unit is operated with emergency operation switch.

—

Lighting

Normal

——

10-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUZ-A24NA

MUY-A15NA MUY-A17NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

Part name Check method and criterion Figure

Defrost thermistor (RT61)

(MUZ)

Fin temperature thermistor

(RT64)

Ambient temperature ther-

mistor (RT65)

Outdoor heat exchanger

temperature thermistor

(RT68)

Measure the resistance with a tester.

Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board" and

"Outdoor electronic

control P.C. board”, for the chart of thermistor.

Discharge temperature

thermistor (RT62)

Measure the resistance with a tester.

Before measurement, hold the thermistor with your hands to warm it up.

Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C. board" and

"Outdoor electronic

control P.C. board", for the chart of thermistor.

Compressor (MC)

Measure the resistance between the terminals with a tester.

(Temperature 14 - 104°F)

Normal

A09/12 A15/17/24 GA24

U-V

U-W

V-W

0.43 - 0.53  0.39 - 0.49  0.86 - 1.06 

Outdoor fan motor (MF)

Measure the resistance between the terminals with a tester.

(Temperature 14 - 104°F)

Color of lead wire

Normal

A09/12/15/17 A24 GA24

WHT – BLK

BLK – RED

RED – WHT

31 - 41  13 - 16 

R. V. coil (21S4)

(MUZ)

Measure the resistance between the terminals with a tester.

(Temperature 14 - 104°F)

Normal

1.20 - 1.55 k

Expansion valve coil (LEV)

Measure the resistance with a tester.

(Temperature: 14 - 104°F)

Color of lead wire Normal

WHT – RED

38 - 50 

RED – ORN

YLW – BRN

BRN – BLU

WHT

RED BLK

WHT

RED BLK

LEV

WHT

RED

ORN

YLW

BRN

BLU

10-5. Troubleshooting flow

MUZ-A09/12/15/17 MUY-A15/17

MUZ-A24 MUY-A24 MUZ-GA24 MUY-GA24

Check the voltage

between terminals.

Check the compres-

sor.

Disconnect the connector (CN61)

between compressor and the intel-

ligent power module (IPM).

Check the resistance of the intelligent

power module.

See 10-5. “Check of compressor” .

See 10-5. “Check of open phase” .

See 10-5. “Check of intelligent power module”.

Is the resistance

infinite?

Yes

Replace the inverter P.C.

board.

(0 - several )

Yes

Is the voltage

balanced?

Replace the inverter P.C.

board and compressor.

Measure the voltage between each lead wire lead-

ing to the compressor.

U (BLK) - V (WHT)

V (WHT) - W (RED)

W (RED) - U (BLK)

Is voltage output on right table?

Yes

Disconnect the terminal of the compressor. 3 minutes after turning

on the power supply, start EMERGENCY OPERATION.

After the outdoor fan starts running, wait for 1 minute or more before measur-

ing the voltage.

Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)

Is output balanced?

Yes

Is the input voltage to the outdoor electronic control

P.C. board 370 V or more?

Yes

Replace the power board.

Turn off power supply of indoor and outdoor unit, and

measure the compressor winding resistance between

the compressor terminals.

Is the resistance between each terminal normal?

Yes

Replace the compressor.

Reconnect the lead wire of compressor, and turn on power

supply to indoor and outdoor unit.

3 minutes later, starts EMERGENCY OPERATION.

Clarify the causes by counting time until the inverter stops.

0 to 10 seconds: compressor layer short

10 to 60 seconds: compressor lock

60 seconds to 5 minutes: refrigerant circuit defective

5 minutes or more: normal

A How to check inverter/compressor

Ɣ Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance be-

tween the compressor terminals.

<<Measurement point>>

At 3 points

BLK-WHT

BLK-RED

WHT-RED

<<Judgement>>

Refer to 10-4.

0 [] ················Abnormal (short)

Infinite [] ·······Abnormal (open)

NOTE: 1. Be sure to zero the ohmmeter before measurement.

2. Winding resistance for each phase at 68°F (20°C).

Refer to "3. SPECIFICATION".

Measure the resistance between the lead wires at 3 points.

B Check of open phase

MUZ-A09/12/15/17 MUY-A15/17

ohmmeter indication

••••••Normal

(infinite)

••••••Abnormal

(0~dozens of )



D Check of compressor

C Check of intelligent power module

MUZ-A09/12/15/17 MUY-A15/17

E Check of compressor winding

Ɣ With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if

the inverter is normal by measuring the balance of voltage between the terminals.

Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)

<< Operation method>>

Start cooling or heating operation by pressing EMERGENCY OPERATION

switch on the indoor unit. (TEST RUN OPERATION: Refer to 7-6.)

<<Measurement point>>

at 3 points

BLK (U) - WHT (V)

BLK (U) - RED (W)

WHT(V) - RED (W)

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 À ashes 9 times. (Refer to 10-6.1.)

ƔMeasure the resistance between the terminals on the intelligent power module.

<<Measurement point>>

At 6 points

BLK-WHT, WHT-BLK

BLK-RED, RED-BLK

WHT-RED, RED-WHT

<<Judgement>>

In¿ nite []············Normal

0 - dozens of········Abnormal (short)

Refer to 10-5. “Check of compressor

operation time”.

Does the compressor operate continuously?

OK.

Yes

Refer to 10-5. “Check of compressor

winding”.

Is the compressor normal?

Replace the compressor.

Yes

Is the compressor operation

time more than 10 seconds?

Check the refrigerant circuit.

Yes

Replace the compressor.

LED

Inverter P.C. board

(Parts side)

9-time flash

2.5-second OFF

Flashing

F Check of compressor operation time

MUZ-A09/12/15/17 MUY-A15/17

G Check of outdoor thermistors

Ɣ 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 EMERGENCY

OPERATION switch on the indoor unit.

(TEST RUN OPERATION: Refer to 7-6.)

<<Measurement>>

Measure the time from the start of outdoor fan running to the stop

of compressor due to overcurrent.

MUZ-A09/12/15/17 MUY-A15/17

Thermistor Symbol Connector, Pin No. Board

Defrost RT61 Between CN641 pin 1 and pin 2

Inverter P.C. board

Discharge temperature RT62 Between CN641 pin 3 and pin 4

Fin temperature RT64 Between CN642 pin 1 and pin 2

Ambient temperature RT65 Between CN643 pin 1 and pin 2

MUZ-A24 MUY-A24 MUZ-GA24 MUY-GA24

Thermistor Symbol Connector, Pin No. Board

Defrost RT61 Between CN661 pin 1 and pin 2

Outdoor electronic control P.C. board

Discharge temperature RT62 Between CN661 pin 3 and pin 4

Outdoor heat exchanger temperature RT68 Between CN661 pin 7 and pin 8

Ambient temperature RT65 Between CN663 pin 1 and pin 2

Fin temperature RT64 Between CN3 pin 1 and pin 2 Outdoor power board

Replace the thermistor except RT64.

When RT64 is abnormal, replace the inverter P.C.

board or the outdoor power board.

Replace the inverter P.C. board

or the outdoor power board.

Is the thermistor normal? (Refer to 10-6.1.

or 10-6.3.)

Reconnect the connector of thermistor.

Turn ON the power supply and press EMERGENCY OPERATION switch.

Does the unit operate for 10 minutes or more

without showing thermistor abnormality?

OK.

(Cause is poor contact.)

Yes

Disconnect the connector of thermistor in the outdoor P.C. board (see

below table), and measure the resistance of thermistor.

Compressor starts

Abnormal

(IPM failure)

(Compressor winding short)

Abnormal

(Compressor lock out)

(Starting defect)

Abnormal

(Poor contact,)

(Outdoor P.C. board defect)

(Disconnected connector)

Abnormal

(Refrigerant circuit defect)

(Closed valve)

Normal

0 second

1 second

2 seconds

10 seconds

10 minutes

<<Judgement>>

Disconnect connector (CN61)

between the compressor and the

intelligent power module.

Turn ON the power supply and press

EMERGENCY OPERATION switch

twice (HEAT mode).

H Check of R.V. coil

MUZ-A09/12/15/17

First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4.

In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector

although no signal is being transmitted to R.V. coil.

Check if CN721 is connected.

Is there 208/230 VAC between CN721

and on the power P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the 4-way valve.

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

Is there 208/230 VAC between CN721

and on the power P.C. board 3 minutes

after the power supply is turned ON?

Yes

Replace the 4-way valve.

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

Disconnect connector (CN61)

between the compressor and the

intelligent power module.

Turn ON the power supply and

press EMERGENCY OPERATION

switch once (COOL mode).

Replace the power

P.C. board.

Replace the power

P.C. board.

MUZ-A24 MUZ-GA24

Heating operation does not work.•

Is there voltage of 208/230 VAC between pin1

and pin 2 at connector CN912?

Yes

Disconnect the lead wire leading to the compressor.

3 minutes after turning on the power supply, start EMERGENCY

OPERATION in HEAT mode.

Turn off power supply of indoor and outdoor unit, and discon-

nect the connector CN781 in the outdoor electronic control P.C.

board.

3 minutes after turning ON the power supply, start EMER-

GENCY OPERATION in HEAT mode.

Turn OFF power supply of indoor and outdoor unit.

Is there voltage 12 VDC be-

tween the connector CN781

pin 5 (+) and pin 3 (-)?

Disconnect the connec-

tor CN912 in noise ¿ lter

P.C. board. Is there normal

resistance to R.V. coil?

Replace the R.V. coil.

Replace the 4-way valve.

Replace the noise ¿ lter P.C. board.

Yes

Replace the electronic

control P.C. board.

Cooling operation does not work.

•

Is there voltage of 208/230 VAC between pin1

and pin 2 at connector CN912?

Disconnect the lead wire leading to the compressor.

3 minutes after turning on the power supply, start EMERGENCY

OPERATION in COOL mode.

Turn OFF power supply of indoor and outdoor unit, and

disconnect the connector CN781 in the outdoor electronic

control P.C. board.

3 minutes after turning ON the power supply, start EMER-

GENCY OPERATION in COOL mode.

Yes

Is there voltage 12 VDC between the connector

CN781 pin 5 (+) and pin 3 (-)?

Replace the noise ¿ lter P.C. board.

Replace the outdoor electronic control P.C. board.

Replace the 4-way valve.

If the connector CN912 is disconnected or R.V.

coil is open, voltage occurs between terminals

even when the control is OFF.

Yes

MUZ-A09/12/15/17 MUY-A15/17

I Check of outdoor fan motor

MUZ-A24 MUY-A24 MUZ-GA24 MUY-GA24

Is the resistance

between each terminal

of outdoor fan motor

normal?

(Refer to 10-4.)

Yes

Disconnect CN932

from the inverter

P.C. board.

Turn ON the power

supply.

Rotate the outdoor fan

slowly by hand, and measure

the voltage of CN931

(Measurement of feedback

output).

Between 1(+) and 5(-)

Between 2(+) and 5(-)

Between 3(+) and 5(-)

Does the voltage between

each terminal repeat 5

and 0 VDC by turns?

Does the outdoor fan

rotate smoothly?

Check the inverter P.C.

board. (Refer to 10-5. )

Replace the outdoor fan

motor.

(Fixed to either 5 or 0 VDC) No

Is the resistance between each ter-

minal of outdoor fan motor normal?

(Refer to 10-4.)

Check the connection between the

connector CN931 and CN932.

Disconnect CN932 from outdoor electronic control P.C. board,

and turn on the power supply.

Rotate the outdoor fan motor manually and measure the voltage

of CN931.

Between 1(+) and 5(-)

Between 2(+) and 5(-)

Between 3(+) and 5(-)

Does the voltage between each terminal become 5 and 0

VDC repeatedly?

Does the outdoor fan motor rotate smoothly?

Replace the outdoor fan motor. Replace the outdoor electronic control P.C. board.

Yes

(Fixed to either 5 or 0 VDC)

Yes

MUZ-A24 MUY-A24 MUZ-GA24 MUY-GA24

MUZ-A09/12/15/17 MUY-A15/17

J Check of power supply

Is there voltage 208/230 VAC

between the indoor terminal

block S1 and S2?

Yes

Replace the indoor

electronic control P.C.

board.

Rectify indoor/outdoor

connecting wire.

Yes

If light up, OK.

If À ash, refer to 10-3.

Does the left lamp of OPERATION

INDICATOR lamp on the indoor unit

light up?

Does LED on the inverter P.C.

board light up or À ash? (Refer

to 10-6.1.)

Replace the inverter

P.C. board.

Is there voltage 260 - 300 VDC

between DB61 (+) and DB61 (–) on

the inverter P.C. board?

(Refer to 10-6.1.)

Check the electric parts in main circuit.

Yes

Disconnect the connector (CN61)

between compressor and intelligent

power module.

Turn ON power supply and press

EMERGENCY OPERATION switch.

Inverter P.C. board

(Solder side)

DB61

260 - 300 VDC

Is there voltage of 208/230 VAC in the power

supply terminal block?

Check the connecting of parts of main power

supply circuit.

Check the power supply cable.

Turn ON power supply.

Is the output voltage from the noise ¿ lter P.C.

board 208/230 VAC?

Replace the noise ¿ lter P.C. board.

Yes

Is the input voltage to the power board

208/230 VAC?

Replace the reactor.

Yes

Is the input voltage to the outdoor electronic

control P.C. board 294/325 VDC?

Replace the power board.

Replace the outdoor electronic control P.C. board.

Yes

MUZ-A09/12/15/17 MUY-A15/17

K Check of current-limiting resistor

MUZ-A24 MUY-A24 MUZ-GA24 MUY-GA24

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

Replace the power P.C.

board or the inverter P.C.

board.

Does LED on the

inverter P.C. board

light up?

Does the rush current

limiting relay (X64) work

properly? (Normally it

closes 1 second after

outdoor unit power ON.)

Is the resistance of current-

limiting resistor (R64A or

R64B) on the power P.C.

board normal?

(Normal resistance: 5  ±5%)

Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective.

Yes

Turn ON the power

supply and press

EMERGENCY

OPERATION switch.

Replace the inverter P.C.

board or the compressor.

Replace the power P.C. board.

Yes

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

Replace the noise ¿ lter

P.C. board or the outdoor

electronic control P.C.

board.

Does LED on the

outdoor electronic

P.C. board light up?

Does the rush current

limiting relay (X64) work

properly? (Normally it

closes 1 second after

outdoor unit power ON.)

Is the resistance of current-

limiting resistor (R64A or

R64B) on the noise ¿ lter P.C.

board normal?

(Normal resistance: 5  ±5%)

Ɣ Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective.

Yes

Turn ON the power

supply and press

EMERGENCY

OPERATION switch.

Replace the outdoor

electronic control P.C.

board or power P.C.

board or the compressor.

Replace the noise ¿ lter P.C.

board.

Replace the noise ¿ lter P.C. board.

Yes

MUZ-A09/12/15/17 MUY-A15/17

L Check of LEV (Expansion valve)

This figures show about MSZ-A09/12/15/17.

MUZ-A24 MUY-A24 MUZ-GA24 MUY-GA24

Press OPERATE/STOP (ON/OFF) button of the remote

controller (the set temperature is displayed) with the

remote controller headed towards the indoor unit.

Expansion valve operates in full-opening direction.

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

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

2. Press RESET button on the remote controller.

1. Regardless of normal or abnormal condition, a

short beep is emitted once the signal is received.

Measure each voltage between connector pins of

CN724 on the inverter P.C. board.

1. Pin (-) — Pin (+)

2. Pin (-) — Pin

(+)

3. Pin

(-) — Pin (+)

4. Pin (-) — Pin (+)

Is there about 3 - 5 VAC between each?

NOTE: Measure the voltage with an analog tester.

Properly ¿ x the LEV coil to the expansion valve.

Replace the inverter

P.C. board.

Replace the LEV coil.

Replace the expansion valve.

Is LEV coil properly ¿ xed to

the expansion valve?

Does the resistance of LEV

coil have the characteristics?

(Refer to 10-4.)

Do you hear the expansion valve "click,

click·······"?

Do you feel the expansion valve vibrate

on touching it ?

Turn ON the power supply.

While pressing both OPERATION SELECT button and

TOO COOL button on the remote controller at the same

time, press RESET button.

First, release RESET button.

Hold down the other two buttons for another 3 seconds.

Con¿ rm that the indicators on the LCD screen shown in

the right ¿ gures are all displayed.

Then release the buttons.

Yes

Turn ON power supply to the outdoor unit after checking

LEV coil is mounted to the LEV body securely.

Is "click - click" sound heard?

Or, do you feel vibration of the LEV coil with a hand?

Disconnect the connector CN795.

Is there normal resistance to LEV coil?

Normal

Replace the outdoor electronic control P.C. board.

Replace the LEV coil.

Yes

M Check of inverter P.C. board

MUZ-A09/12/15/17 MUY-A15/17

Check the outdoor fan motor.

(Refer to 10-5. .)

Is the fuse (F901) blown on the in-

verter P.C. board?

Check the connection of the connectors.

(CN931, CN932) of outdoor fan motor.

If the connection is poor, correct it.

Operate the outdoor unit by starting

EMERGENCY OPERATION.

Check the LED indication on the in-

verter P.C. board.

Does the LED À ash 10-time?

Replace the inverter P.C. board.

Check the corresponding parts

following LED indication.

(Refer to 10-3.)

Yes

(10-time À ash)

Inverter P.C. board

(Solder side)

CN932

CN931

N How to check miswiring and serial signal error

Inverter P.C.board

(Parts side)

LED

Blinking

Outdoor electronic control P.C. board

BlinkingLighted

(Parts side)

LED2

LED1

Turn OFF the power supply.

Is there rated voltage in the

power supply?

Yes

Turn ON the power supply.

Check the power supply.

Is there rated voltage between

outdoor terminal block S1 and

S2?

• Check the wiring.

• Check the fuse (F65). (For MUZ-A24NA-

MUZ-A24NA-

MUY-A24NA-

MUZ-

GA24

MUY-GA24

)

Press EMERGENCY OPERATION switch once.

Does the left lamp of OPERATION INDICA-

TOR lamp light up? <Con¿ rmation of the

power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

Is there any miswiring, poor

contact, or wire disconnec-

tion of the indoor/outdoor

connecting wire?

Yes

Correct them.

Turn OFF the power supply.

Check once more if the indoor/outdoor

connecting wire is not miswiring.

Short-circuit outdoor terminal block S2

and S3.

1. Miswiring may damage indoor electronic control P.C.

board during the operation.

Be sure to con¿ rm the wiring is correct before the opera-

tion starts.

3. Be sure to check this within 3 minutes after turning ON.

After 3 minutes, LED blinks 6 times. Even when the

inverter P.C. board or the outdoor electronic control P.C.

board is normal, LED blinks 6 times after 3 minutes.

Turn ON the power supply.

Does the LED on the inverter P.C. board or

the outdoor electronic control P.C. board

repeat "3.6-second-OFF and 0.8-second-

ON quick blinking"? 3

Yes

(Lighted

or not

lighted)

Replace the inverter P.C. board or

the outdoor electronic control P.C. board.

2. Be careful of the residual voltage

of smoothing capacitor.

Turn OFF the power supply.

Remove the short-circuit between

outdoor terminal block S2 and S3.

Turn ON the power supply.

Is there amplitude of 10 to 20 VDC

between outdoor terminal block S2 and

S3? <Con¿ rmation of serial signal>

Yes

Is there any error of the in-

door/outdoor connecting wire,

such as the damage of the wire,

intermediate connection, poor

contact to the terminal block?

Yes

Replace the indoor/

outdoor connecting

wire.

Turn OFF inverter-controlled lighting

equipment.

Turn OFF the power supply and then

turn ON again.

Press EMERGENCY OPERATION

switch.

•

Is serial signal

error indicated 6

minutes later?

Yes

Reinstall

either the unit

or the light

away from

each other.

Attach a ¿ lter

on remote

control

receiving

section of the

indoor unit.

•

Is there rated voltage between

indoor terminal block S1 and S2?

<Con¿ rmation of power voltage>

Is there any error of the in-

door/outdoor connecting wire,

such as the damage of the wire,

intermediate connection, poor

contact to the terminal block?

Yes

Replace the indoor/

outdoor connecting

wire.

Replace the indoor electronic control P.C. board.

Yes

Be sure to release the failure-mode recall function

after checking.

Yes

O Electromagnetic noise enters into TV sets or radios

Yes

Is the unit grounded?

Ground the unit.

Yes

Is the distance between the antennas

and the indoor unit within 9.91 ft., or is

the distance between the antennas and

the outdoor unit within 9.91 ft.?

Extend the distance between the antennas and

the indoor unit, and/or the antennas and the

outdoor unit.

Is the distance between the TV sets or

radios and the indoor unit within 3.28

ft., or is the distance between the TV

sets or radios and the outdoor unit

within 9.91 ft.?

Yes

Extend the distance between the TV sets and/or

radios and the indoor unit, or the TV sets or

radios and the outdoor unit.

Are the antennas damaged?

Is the coaxial cable damaged?

Is there any poor contact in the anten-

na wiring?

Yes

Replace or repair the antenna.

Replace or repair the coaxial cable.

Is the indoor/outdoor connecting wire of

the air conditioner and the wiring of the

antennas close?

Yes

Extend the distance between the indoor/outdoor

connecting wire of the air conditioner and the wir-

ing of the antennas.

Even if all of the above conditions are ful¿ lled, the electromagnetic noise may enter, depending on the electric ¿ eld strength

or the installation condition (combination of speci¿ c conditions such as antennas or wiring).

Check the followings before asking for service.

1. Devices affected by the electromagnetic noise

TV sets, radios (FM/AM broadcast, shortwave)

2. Channel, frequency, broadcast station affected by the electromagnetic noise

3. Channel, frequency, broadcast station unaffected by the electromagnetic noise

4. Layout of:

indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver

5. Electric ¿ eld intensity of the broadcast station affected by the electromagnetic noise

6. Presence or absence of ampli¿ er such as booster

7. Operation condition of air conditioner when the electromagnetic noise enters in

1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic

noise.

2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for

power ON, and check for the electromagnetic noise.

3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the elec-

tromagnetic noise.

4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the

indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.

P Check of bus-bar voltage

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

•Check the voltage of power supply.

•Con¿ rm outdoor unit failure mode

recall function. (Refer to 10-2.2)

Blink 5 times

Con¿ rm LED1 indication lamp on

the outdoor electronic control P.C.

board.

Replace the power board.

Blink 9 times

Replace the outdoor elec-

tronic control P.C. board.

Turn OFF power supply before removing P.C. board.

Con¿ rm LED1 indication lamp

on the outdoor electronic con-

trol P.C. board.

Turn ON power supply.

Start operation.

Blink 6 times

Replace the outdoor elec-

tronic control P.C. board.

Lighting

Replace the outdoor elec-

tronic control P.C. board.

Blink 9 times

Replace the power board.

Con¿ rm LED1 indication lamp

on the outdoor electronic con-

trol P.C. board.

Turn ON power supply.

Start operation.

Normal.

Lighting Lighting

Back side of unit

-4 14 32 50 68 86 104

100

Temperature (°F)

Ambient temperature thermistor (RT65)

Defrost thermistor (RT61)

Temperature (°F)

Discharge temperature thermistor (RT62)

32 50 68 86 104 122 140 158 176 194 212 230 248

100

200

300

400

500

600

700

32 50 68 86 104 122 140 158 176

100

120

140

160

180

200

Temperature (°F)

Fin temperature thermistor (RT64)

Resistance(k)

CN932

Output to drive

outdoor fan motor

CN642 Fin temperature

thermistor (RT64)

CN643 Ambient tempera-

ture thermistor (RT65)

CN641 Discharge temper-

ature thermistor (RT62)

CN641 Defrost thermistor

(RT61)

CN724

LEV

connector

DB61

208/230 VAC

CN725

Connecting wire with

power P.C. board

Jumper wire for change

in defrost setting

Front side of unit

DB61

260V - 300 VDC

C63C

Smoothing capacitor

C63A

Smoothing capacitor

C63B

Smoothing capacitor

CN931

Rotational frequency feedback

signal of outdoor fan motor

(+)

GND

Output to

drive

compressor

(LDW,

LDV,

LDU)

LED

monitor

lamp

CN601

Connector for indoor/

outdoor communication

(+)

(-)

1. Inverter P.C. board

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA

MUY-A15NA MUY-A17NA

10-6. TEST POINT DIAGRAM AND VOLTAGE

MUZ

CN721 R.V.coil

208/230 VAC

Back side of unit

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA

Front side of unit

CN726

Connecting wire with

inverter P.C.board

208/230 VAC

NR63

Varistor

NR62

Varistor

NR64

Varistor

2. Power P.C. board

-4 14 32 50 68 86 104

100

32 50 68 86 104 122 140 158 176

200

180

160

140

120

100

Resistance (k)

Temperature (°F)

Defrost thermistor (RT61)

Ambient temperature thermistor (RT65)

Outdoor heat exchanger temperature thermistor (RT68)

Fin temperature thermistor (RT64)

3. Outdoor electronic control P.C. board

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

LED 1

LED 2

Bus-bar

voltage

CN801

294 - 370

VDC

Input

(

CN932

20-90 VAC

GND

5 VDC

pulse wave

(

To fan

motor

Defrost thermistor

(RT61)(MUZ)

Discharge temperature

thermistor(RT62)

Outdoor heat exchanger

temperature thermistor (RT68)

(

(+)

(–)

(+)

Rush current relay

(–)

R.V. coil (–)

(

12V

15V

CN931

(+)

(–)

(

CN661

CN701

Signal transmission

(To power board)

5 VDC pulse wave

(+)

(–)

(

GND

CN702

Signal reception

(From power board)

5 VDC pulse wave

GND (power board)

CN781

CN795

12 VDC

pulse wave

LEV

(

32 50 68 86 104 122 140 158 176 194 212 230 248

700

600

500

400

300

200

100

Resistance (k)

Temperature (°F)

Discharge temperature thermistor (RT62)

F801

FUSE

T3.15AL250V

(

Ambient temperature

thermistor (RT65)

CN663

for indoor

5-10 VDC

CN601

208/230 VAC

60 Hz

Input

(

{

MUZ

CN912

R.V. coil

208/230 VAC

60Hz

Output

208/230 VAC

60Hz

Input

208/230 VAC

60Hz

Output

{

CN901

To electronic

control

P.C. board

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

F64 FUSE

T2 AL250V

F911 FUSE (MUZ)

T1 AL250V

4. Noise filter P.C. board

CN902

To power

board

{

CN903

To power

board

{

208/230 VAC

60Hz

Output

NR64 VARISTOR

MUZ-A24NA MUY-A24NA

5. Outdoor power board

294-370 VDC

Output

(Red)

(White)

Connect to the compressor

Voltage among phases: 5 to 180 V

Connect to the ground

CN5

Primary current detection

(Connect to the noise filter)

CN2

Connect to the controller board

(+)1-5(–): Signal transmission

(To electronic control P.C. board)

5 V DC pulse wave

(+)2-5(–): Zero cross signal

3-4 : Not used

(+)6-5(–): 15 V

(+)7-5(–): 15 V

(+)

(–)

Signal reception (From electronic

control P.C. board)

5 V DC pulse wave

)

CN3

Fin temperature thermistor RT64

294-370 VDC

Output

Connect to the compressor

Voltage among phases: 5 to 180 V

Connect to the ground

CN5

Primary current detection

(Connect to the noise filter)

CN2

Connect to the controller board

(+)1-5(–): Signal transmission

(To electronic control P.C. board)

5 V DC pulse wave

(+)2-5(–): Zero cross signal

3-4 : Not used

(+)6-5(–): 15 V

(+)7-5(–): 15 V

Signal reception (From electronic

control P.C. board)

5 V DC pulse wave

)

CN3

Fin temperature thermistor RT64

(Red)

(White)

(+)

(–)

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

11-1. MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA

NOTE: Turn OFF power supply before disassembly.

OPERATING PROCEDURE PHOTOS

1. Removing the cabinet

(1) Remove the screw fixing the service panel.

(2) Pull down the service panel and remove it.

(3) Remove the screws fixing the conduit cover.

(4) Remove the conduit cover.

(5) Disconnect the power supply wire and indoor/outdoor

connecting wire.

(6) Remove the screws fixing the top panel.

(7) Remove the top panel.

(8) Remove the screws fixing the cabinet.

(9) Remove the cabinet.

(10) Remove the screws fixing the back panel.

(11) Remove the back panel.

Photo 2

Photo 1

(1) Slide the sleeve and check if there is a locking lever or not.

(2) The terminal with this connector has the

locking mechanism.

Slide the sleeve.

Pull the terminal while

pushing the locking

lever.

Hold the sleeve, and

pull out the terminal

slowly.

Connector

Sleeve

Locking lever

DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

The terminal which has the locking mechanism can be detached as shown below.

There are two types (refer to (1) and (2)) of the terminal with locking mechanism.

The terminal without locking mechanism can be detached by pulling it out.

Check the shape of the terminal before detaching.

Conduit cover

Screw of the

conduit cover

Conduit plate

Screws of

the cabinet

Service

panel

Screw of the

cabinet

Screws

of the top

panel

Hooks

Screw of

the service

panel

Back

panel

Screws of

the top panel

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 power supply and indoor/outdoor con-

necting wire and remove the back panel. (Refer to 1.)

(3) Disconnect the ground wires, the lead wire to the reac-

tor and the following connectors:

CN721 (4-way valve coil)

CN931, CN932 (Fan motor)

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.

(6) Remove the inverter assembly.

(7) Disconnect all connectors and lead wires on the

inverter P.C. board.

(8) Remove the inverter P.C. board from the inverter

assembly.

(9) Remove the screw fixing the power P.C. board.

(10) Disconnect all connectors and lead wires on the

power P.C. board.

(11) Remove the power P.C. board from the inverter

assembly.

Photo 3

Photo 4

Photo 5

3. Removing R.V. coil (MUZ)

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

(Refer to 1.)

(2) Disconnect the power supply and indoor/outdoor con-

necting wire and remove the back panel. (Refer to 1.)

(3) Remove the inverter assembly. (Refer to 2.)

(4) Remove the R.V. coil.

4. Removing the discharge temperature thermistor

and defrost thermistor

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

(Refer to 1.)

(2) Disconnect the power supply and indoor/outdoor con-

necting wire and remove the back panel. (Refer to 1.)

(3) Remove the inverter assembly. (Refer to 2.)

(4) Pull out the discharge temperature thermistor from its

holder.

(5) Pull out the defrost thermistor from its holder. (Photo 6)

Screws of

the ground

wires

Screws of the

relay panel

Heat sink

Inverter P.C.

board

Power P.C.

board

Screw of the

power P.C. board

R.V. coil

(For MUZ)

Discharge temperature thermistor

OPERATING PROCEDURE PHOTOS

5. Removing outdoor fan motor

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

(Refer to 1.)

(2) Disconnect the power supply and indoor/outdoor con-

necting wire and remove the back panel. (Refer to 1.)

(3) Disconnect the connectors for outdoor fan motor.

(4) Remove the propeller nut.

(5) Remove the propeller.

(6) Remove the screws fixing the fan motor.

(7) Remove the fan motor.

Photo 6

Photo 7

Photo 8

6. Removing the compressor and 4-way valve

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

(Refer to 1.)

(2) Disconnect the power supply and indoor/outdoor con-

necting wire and remove the back panel. (Refer to 1.)

(3) Remove the inverter assembly. (Refer to 2.)

(4) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure

gauge shows 0 PSIG.

(5) Detach the brazed part of the suction and the dis-

charge pipe connected with compressor.

(6) Remove the nuts of compressor legs.

(7) Remove the compressor.

(8) Detach the brazed part of pipes connected with 4-way

valve.

Defrost

thermistor

Propeller

Screws of the outdoor fan motor

Brazed parts

of 4-way

valve

11-2. MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

NOTE: Turn OFF power supply before disassembly.

OPERATING PROCEDURE PHOTOS

1. Removing the cabinet

(1) Remove the screws of the service panel.

(2) Remove the screws of the top panel.

(3) Remove the screw of the valve cover.

(4) Remove the service panel.

(5) Remove the top panel.

(6) Remove the valve cover.

(7) Remove the screws of the cabinet.

(8) Remove the cabinet.

(9) Remove the screws of the back panel.

(10)

Remove the back panel.

Photo 3

Photo 1

Photo 2

Screws

of the

cabinet

Screw of the top panel

Screws of the cabinet

Screws

of the

cabinet

Screw of the service panel

Screws

of the

top

panel

Screw

of the

valve

cover

Screw of the motor support

Conduit plate

Screws of

the back

panel

Set screws of the back panel

OPERATING PROCEDURE PHOTOS

2. Removing the inverter assembly, inverter P.C.

board and power board

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

(Refer to 1.)

(2) Remove the back panel. (Refer to 1.)

(3) Disconnect the following connectors:

CN931 and CN932 (Fan motor)

CN795 (LEV)

CN661 (Discharge temperature thermistor, defrost

thermistor (MUZ) and outdoor heat exchanger

temperature thermistor)

CN912 (4-way valve) (MUZ)

(4) Remove the compressor connector.

(5) Remove the screws fixing the relay panel.

(6) Remove the inverter assembly.

(7) Disconnect all connectors and lead wires on the elec-

tronic control P.C. board.

(8) Remove the electronic control P.C. board from the

inverter assembly.

(9) Remove the screws fixing the power board assembly.

(10)

Disconnect all connectors and lead wires on the power

board.

(11)

Remove the power board from the inverter assembly.

(12)

Disconnect all connectors and lead wires on the noise

filter P.C. board.

(13)

Remove the noise filter P.C. board from the inverter

assembly.

Photo 4

3. Removing R.V. coil (MUZ)

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

(Refer to 1.)

(2) Remove the back panel. (Refer to 1.)

(3) Remove the inverter assembly. (Refer to 2.)

(4) Remove the R.V. coil. (Photo 8)

Screws of the relay panel

Screws of the power board assembly

OPERATING PROCEDURE PHOTOS

4. Removing the defrost thermistor (MUZ), dis-

charge temperature thermistor, outdoor heat

exchanger temperature thermistor and ambient

temperature thermistor

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

(Refer to 1.)

(2) Remove the back panel. (Refer to 1.)

(3) Remove the inverter assembly. (Refer to 2.)

(4) Pull out the defrost thermistor from its holder. (MUZ)

(5) Pull out the discharge temperature thermistor from its

holder.

(6) Pull out the outdoor heat exchanger temperature ther-

mistor from its holder.

(7) Pull out the ambient temperature thermistor from its

holder.

Photo 5

Photo 6

5. Removing outdoor fan motor

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

(Refer to 1.)

(2) 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.

(6) Remove the fan motor.

Photo 7

Discharge temperature thermistor

Defrost

thermistor

(For MUZ)

Outdoor heat

exchanger

temperature

thermistor

Ambient

temperature

thermistor

Propeller

Screws of the outdoor fan motor

OPERATING PROCEDURE PHOTOS

6. Removing the compressor and 4-way valve

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

(Refer to 1.)

(2) Remove the back panel. (Refer to 1.)

(3) Remove the inverter assembly. (Refer to 2.)

(4) Recover gas from the refrigerant circuit.

NOTE: Recover gas from the pipes until the pressure

gauge shows 0 PSIG.

(5) Detach the brazed part of the suction and the dis-

charge pipe connected with compressor.

(6) Remove the compressor nuts.

(7) Remove the compressor.

(8) Detach the brazed part of 4-way valve and pipe.

Photo 8

Photo 9

7. Removing the reactor

(1) Remove the top panel. (Refer to 1.)

(2) Disconnect the reactor lead wire.

(3) Remove the screws of the reactor, and remove the

reactor.

Photo 10

Screws of the reactor

Brazed part of the

discharge pipe

Brazed part of the

suction pipe

Brazed parts of 4-way valve

R.V. coil

(For MUZ)

12-1. PARTS LIST (non-RoHS compliant)

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA

1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

16 14

PARTS LIST

1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

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

No. Part No. Part name

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

MUZ- MUY-

A09NA A12NA A15NA A17NA A15NA A17NA

1 E02 927 232 CABINET 111111

2 E02 927 521 GRILLE 1 1 1 1 1 1

3 E02 927 501 PROPELLER 1 1 1 1 1 1

4 E02 927 290 BASE 1 1 1 1 1 1

E02 A54 900

COMPRESSOR MC

KNB092FPAH

E02 A56 900 1111

SNB130FPDH

6 E02 065 506 COMPRESSOR RUBBER SET 3 3 3333

3 RUBBERS/SET

E02 A54 661

STOP VALVE (GAS)

E02 A56 661 1111

8 E02 927 662 STOP VALVE (LIQUID) 1 1 1 1 1 1

9 E02 A49 245 SERVICE PANEL 1 11111

10 E02 A54 233 BACK PANEL 1 11111

11 E02 A54 640 EXPANSION VALVE 1 1 1 1 1 1

12 E02 927 493 EXPANSION VALVE COIL LEV 1 1 1 1 1 1

E02 A56 961

4-WAY VALVE

1111

E02 A54 961 1 1

14 E02 929 523 CONDENSER NET 1 1 1111

15 E02 A54 293 SEPARATOR 111111

16 E02 929 515 MOTOR SUPPORT 111111

17 E02 927 297 TOP PANEL 1 1 1 1 1 1

E02 A54 630

OUTDOOR HEAT EXCHANGER

E02 A56 630 1 1

E02 A51 630 11

19 E02 A54 301 OUTDOOR FAN MOTOR MF 111111

RC0J50-

ƑƑ

20 E02 A49 641 SERVICE PORT 2222221 PC/SET

21 E02 735 936 CAPILLARY TUBE 222222

O.D. 0.118 I.D.0.071

23-5/8

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA

2. OUTDOOR UNIT ELECTRICAL PARTS

No. Part No. Part name

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

MUZ- MUY-

A09NA A12NA A15NA A17NA A15NA A17NA

1 E02 838 337 REACTOR L61 1 1 1111

2 E02 A54 444 POWER P.C. BOARD 1 11111

3 E02 A54 490 R.V. COIL 21S4 1111

4 E02 927 306 THERMISTOR SET

RT61,RT62

111111

DEFROST, DISCHARGE

5 E02 927 308

AMBIENT TEMPERATURE THERMISTOR

RT65111111

6 E02 A54 374 TERMINAL BLOCK TB1 111111

2 P

7 E02 A55 374 TERMINAL BLOCK TB2 111111

3 P

E02 A54 451

INVERTER P.C. BOARD

Including heat

sink and RT64

E02 A55 451 1

E02 A56 451 1 1

E02 A57 451 11

810

282930

MUZ-A24NA MUY-A24NA

3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL

PARTS

3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL

PARTS

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

No. Part No. Part name

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

MUZ-A24NA MUY-A24NA

1 E02 819 297 TOP PANEL 1 1

E02 A53 630

OUTDOOR HEAT EXCHANGER

E02 A58 630 1

3 E02 A58 301 OUTDOOR FAN MOTOR MF 1 1

RC0J60-

ƑƑ

4 E02 851 501 PROPELLER 1 1

5 E02 819 232 CABINET 1 1

6 E02 819 521 FAN GUARD 1 1

7 E02 819 009 HANDLE 1 1

8 E02 851 290 BASE 1 1

9 E02 065 506 COMPRESSOR RUBBER SET 3 3

3 RUBBERS/SET

10 E02 A56 900 COMPRESSOR MC 1 1

SNB130FPDH

11 E02 A58 661 STOP VALVE (GAS) 1 1

ø5/8

12 E02 821 662 STOP VALVE (LIQUID) 1 1

ø1/4

13 E02 A49 641 SERVICE PORT 2 2

1 PC/SET

14 E02 851 493 EXPANSION VALVE COIL LEV 1 1

15 E02 851 640 EXPANSION VALVE 1 1

16 E02 A58 490 R.V. COIL 21S4 1

17 E02 A56 961 4-WAY VALVE 1 1

18 E02 819 650 VALVE COVER 1 1

19 E02 819 245 SERVICE PANEL 1 1

20 E02 935 374 TERMINAL BLOCK TB2 1 1 3 P

21 E02 A53 374 TERMINAL BLOCK TB1 1 1 2 P

22 E02 851 337 REACTOR L 1 1

E02 A58 444

NOISE FILTER P.C. BOARD

E02 A53 444 1

24 E02 935 309

AMBIENT TEMPERATURE THERMISTOR

RT65 1 1

E02 851 308

THERMISTOR SET

RT61,RT62,RT68

DEFROST, DISCHARGE

OUTDOOR HEAT EXCHANGER

E02 A53 308

RT62,RT68

DISCHARGE

OUTDOOR HEAT EXCHANGER

26 E02 A58 440 POWER BOARD 1 1

Including heat sink and RT64

E02 A58 450

OUTDOOR ELECTRONIC

CONTROL P.C. BOARD

E02 A53 450 1

28 E02 A58 233 BACK PANEL (OUT) 1 1

29 E02 817 009 HANDLE 1 1

30 E02 851 515 MOTOR SUPPORT 1 1

31 E02 851 936

CAPILLARY TUBE (TAPER PIPE)

O.D. 0.142 I.D.0.094

1-31/32

12-2. RoHS PARTS LIST (RoHS compliant)

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA

1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

16 14

1. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

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

No.

RoHS

Part No. Part name

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

MUZ-A

MUY-A

09NA 12NA 15NA 17NA

15NA17NA

1 G E12 927 232 CABINET 1 1 1 1 1 1 1 1 1 1 1 1

2 G E12 927 521 GRILLE 1 1 1 1 1 1 1 1 1 1 1 1

3 G E12 927 501 PROPELLER 1 1 1 1 1 1 1 1 1 1 1 1

4 G E12 927 290 BASE 1 1 1 1 1 1 1 1 1 1 1 1

G E12 A54 900

COMPRESSOR MC

111111

KNB092FPAH

G E12 A56 900 1 1 1 1 1 1

SNB130FPDH

6 G E12 065 506 COMPRESSOR RUBBER SET 3 3 3 3 3 3 3 3 3 3 3 3

3 RUBBERS/SET

G E12 A54 661

STOP VALVE (GAS)

111111

3/8

G E12 A56 661 1 1 1 1 1 1

1/2

8 G E12 927 662 STOP VALVE (LIQUID) 1 1 1 1 1 1111111

1/4

9 G E12 A49 245 SERVICE PANEL 1 1 1 1 1 1111111

10 G E12 A54 233 BACK PANEL 1 1 1 1 1 1111111

11 G E12 A54 640 EXPANSION VALVE 1 1 1 1 1 1111111

12 G E12 927 493 EXPANSION VALVE COIL LEV 1 1 1 1 1 1111111

G E12 A56 961

4-WAY VALVE

111111

G E12 A54 961 1 1 1 1 1 1

G E12 929 523

CONDENSER NET

1 1 11111111

G E12 838 523 1 1

G E12 A54 293

SEPARATOR

1 1 11111111

G E12 B49 293 1 1

G E12 929 515

MOTOR SUPPORT

1 1 11111111

G E12 927 515 1 1

17 G E12 927 297 TOP PANEL 1 1 1 1 1 1 1 1 1111

G E12 A54 630

OUTDOOR HEAT EXCHANGER

1111

G E12 A56 630 1 1 1 1

G E12 A51 630 11

G E12 B49 630 1 1

19 G E12 A54 301 OUTDOOR FAN MOTOR MF 1 1 1 1 1 1 1 1 1 1 1 1 RC0J50-

ƑƑ

20 G E12 A49 641 SERVICE PORT 2 2 2 2 2 2 2 2 2 2 2 2 1 PC/SET

G E12 735 936

CAPILLARY TUBE

2 2 22222222

O.D. 0.118 I.D.0.071

23-5/8

G E12 927 937 1 1

O.D. 0.118 I.D.0.079

9-7/16

MUZ-A09NA MUZ-A12NA MUZ-A15NA MUZ-A17NA MUY-A15NA MUY-A17NA

2. OUTDOOR UNIT ELECTRICAL PARTS

No.

RoHS

Part No. Part name

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

MUZ-A

MUY-A

09NA 12NA 15NA 17NA

15NA17NA

1 G E12 838 337 REACTOR L61 1 1 1 1 1 1 1 1 1 1 1 1

2 G E12 A54 444 POWER P.C. BOARD 1 1 1 1 1 1 1 1 1 1 1 1

3 G E12 A54 490 R.V. COIL 21S4 1 1 1 1 1 1 1 1 1 1

4 G E12 927 306 THERMISTOR SET

RT61,RT62

111111111111

DEFROST, DISCHARGE

5 G E12 927 308

AMBIENT TEMPERATURE

THERMISTOR

RT65 111111111111

6 G E12 A54 374 TERMINAL BLOCK TB1 1 1 1 1 1 1 1 1 1 1 1 1

2 P

7 G E12 A55 374 TERMINAL BLOCK TB2 1 1 1 1 1 1 1 1 1 1 1 1

3 P

G E12 A54 451

INVERTER P.C. BOARD

Including heat

sink and RT64

G E12 B49 451 1

G E12 A55 451 1

G E12 A56 451 1 1

G E12 A57 451 11

G E12 B09 451 1

G E12 B51 451 1

G E12 B10 451 1

G E12 B11 451 1

G E12 B12 451 1

12810

282930

MUZ-A24NA MUY-A24NA MUZ-GA24NA MUY-GA24NA

3. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL

PARTS

OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

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

No.

RoHS

Part No. Part name

Symbol

in Wiring

Diagram

Q'ty/unit

Remarks

MUZ- MUY-

A24NA

GA24NA

A24NA

24NA

1 G E12 819 297 TOP PANEL 111111111

G E12 A53 630

OUTDOOR HEAT EXCHANGER

G E12 A58 630 1 1 1 1

G E12 E34 630 1 1

G E12 E35 630 1

G E12 A58 301

OUTDOOR FAN MOTOR MF

1 1 1 1 1 1 RC0J60-

ƑƑ

G E12 E34 301 1 1 1 RC0J77-

ƑƑ

4 G E12 851 501 PROPELLER 111111111

5 G E12 819 232 CABINET 111111111

G E12 D84 521 FAN GUARD 1 1 1 1 1 1

Including ice guard

G E12 819 521 FAN GUARD 1 1 1

7 G E12 819 009 HANDLE 1 1 1 11111 1

8 G E12 851 290 BASE 1 1 1 11111 1

G E12 065 506

COMPRESSOR RUBBER SET

33 3

3 RUBBERS/SET

G E12 C34 506 3 3 3 3 3 3

G E12 A56 900

COMPRESSOR MC

1111 11

SNB130FPDH

G E12 E34 900 1 1 1

SNB130FQBH

11 G E12 A58 661 STOP VALVE (GAS) 11111111 1

ø5/8

12 G E12 821 662 STOP VALVE (LIQUID) 1 1 1 111111

ø1/4

13 G E12 A49 641 SERVICE PORT 2 2 2 222222

1 PC/SET

14 G E12 851 493 EXPANSION VALVE COIL LEV 1 1 1 11111 1

15 G E12 851 640 EXPANSION VALVE 1 1 1 11111 1

16 G E12 A58 490 R.V. COIL 21S4 1 1 1 1 1 1

17 G E12 A56 961 4-WAY VALVE 1 1 1 11111 1

18 G E12 819 650 VALVE COVER 1 1 1 111111

G E12 819 245

SERVICE PANEL

1111 11

G E12 D20 245 1 1 1

20 G E12 935 374 TERMINAL BLOCK TB2 1 1 1 111111

3 P

21 G E12 A53 374 TERMINAL BLOCK TB1 1 1 1 111111

2 P

G E12 851 337

REACTOR L

1111 11

G E12 A87 337 1 1 1

G E12 A58 444

NOISE FILTER P.C. BOARD

111111

G E12 A53 444 111

24 G E12 935 309

AMBIENT TEMPERATURE THERMISTOR

RT65 111111111

G E12 851 308

THERMISTOR SET

RT61,RT62,RT68

111111

DEFROST, DISCHARGE

OUTDOOR HEAT EXCHANGER

G E12 A53 308

RT62,RT68

111

DISCHARGE

OUTDOOR HEAT EXCHANGER

G E12 A58 440

POWER BOARD

1111 11

Including heat sink and RT64

G E12 E34 440 1 1 1

G E12 A58 450

OUTDOOR ELECTRONIC

CONTROL P.C. BOARD

G E12 A53 450 11

G E12 B13 450 1 1

G E12 E34 450 1

G E12 E37 450 1

G E12 E35 450 1

G E12 A58 233

BACK PANEL (OUT)

11 1

G E12 D91 233 1 1 1

E12 E34 233

11 1

29 G E12 817 009 HANDLE 11111111 1

30 G E12 851 515 MOTOR SUPPORT 11111111 1

31 G E12 851 936

CAPILLARY TUBE (TAPER PIPE)

111111111

O.D. 0.142 I.D.0.094

1-31/32

13-1. DRAIN SOCKET

Model Part No.

MUZ-A09/12/15/17NA

MUY-A15/17NA

MAC-851DS

13-2. DRAIN SOCKET ASSEMBLY

Model Part No.

MUZ-A24NA

MUY-A24NA

MUZ-GA24NA

MUY-GA24NA

MAC-811DS

HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Distributed in Jun. 2011. No. OB451 REVISED EDITION-G

Distributed in Jun. 2010. No. OB451 REVISED EDITION-F 5

Distributed in Mar. 2009. No. OB451 REVISED EDITION-E 4

Distributed in May 2008. No. OB451 REVISED EDITION-D 6

Distributed in Nov. 2007. No. OB451 REVISED EDITION-C 7

Distributed in Feb. 2007. No. OB451 REVISED EDITION-B 7

Distributed in Sep. 2006. No. OB451 REVISED EDITION-A 7

Distributed in Apr. 2006. No. OB451 7

Made in Japan

New publication, effective Jun. 2011

Specifications subject to change without notice.

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