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Revision C:

• SPECIFICATION has been corrected.

Please void OB450 REVISED EDITION-B.

INDOOR UNIT

SERVICE MANUAL

No. OB450

REVISED EDITION-C

Wireless type Models

MSZ-A09NA MSZ-A09NA - 1 MSZ-A12NA MSZ-A12NA - 1 MSZ-A15NA MSZ-A15NA - 1 MSZ-A17NA MSZ-A17NA - 1

MSZ-A24NA

MSZ-A24NA - 1

MSY-A15NA

MSY-A15NA - 1

MSY-A17NA

MSY-A17NA - 1

MSY-A24NA

MSY-A24NA - 1

Outdoor unit service manual

MUZ-A·NA Series (OB451)

MXZ-A·NA Series (OB444)

CONTENTS

 

1.

TECHNICAL CHANGES ··································· 2

 

2. PART NAMES AND FUNCTIONS····················· 3

 

3.

SPECIFICATION················································ 4

 

4. OUTLINES AND DIMENSIONS ························ 6

 

5.

WIRING DIAGRAM············································ 8

MSZ-A09/12/15/17NA

6. REFRIGERANT SYSTEM DIAGRAM ··············· 9

7. SERVICE FUNCTIONS ··································· 10

MSY-A15/17NA

8. TROUBLESHOOTING······································11

 

9. DISASSEMBLY INSTRUCTIONS···················· 25

 

10. PARTS LIST····················································· 30

 

 

10-1. PARTS LIST············································ 30

 

 

10-2. RoHS PARTS LIST ································· 36

 

11. MICROPROCESSOR CONTROL···················· 42

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).

 

 

Revision A :

• PARTS LIST has been revised. (10-1.8, 10-2.8)

Revision B :

MSZ-A•NA- 1 and MSY-A•NA- 1 Remote controller has been changed.

Revision C :

• SPECIFICATION has been corrected.

Powerful has been added. (Airflow , Sound level)

1 TECHNICAL CHANGES

MSZ09UN

MSZ-A09NA

MSH24WN

MSZ-A24NA

MSZ12UN

MSZ-A12NA

MS15TN

MSY-A15NA

MSH15TN

MSZ-A15NA

MS17TN

MSY-A17NA

MSH17TN

MSZ-A17NA

MS24WN

MSY-A24NA

1.Control method between indoor and outdoor has been changed.

2.Indoor fan motor has been changed.

3.Signal of remote controller has been changed. (It is not available for conventional models.)

MSZ-A09NA MSZ-A09NA- 1

MSZ-A24NA MSZ-A24NA- 1

MSZ-A12NA MSZ-A12NA- 1

MSY-A15NA MSY-A15NA- 1

MSZ-A15NA

MSZ-A15NA- 1

MSY-A17NA

MSY-A17NA- 1

MSZ-A17NA

MSZ-A17NA- 1

MSY-A24NA

MSY-A24NA- 1

1.Remote controller has been changed.

Temperature indication function (°F/°C) has been added. (Refer to 11-10.)

Models

Remote controller

Temperature indication

MSZ-A09/12/15/17NA

KM06A

°F

MSZ-A09/12/15/17NA- 1

KM07J

°F/°C

MSZ-A24NA

KM06B

°F

MSZ-A24NA - 1

KM07K

°F/°C

MSY-A15/17NA

KM06C

°F

MSY-A15/17NA - 1

KM07L

°F/°C

MSY-A24NA

KM06D

°F

MSY-A24NA - 1

KM07M

°F/°C

Timer indication has been changed. (AM/PM indication)

2.Conduit plate has been removed. (MSZ-A09/12/15/17, MSY-A15/17)

3.Conduit cover, terminal block cover and terminal block holder have been changed. (MSZ-A09/12/15/17, MSY-A15/17)

2

2 PART NAMES AND FUNCTIONS

MSZ-A09NA

MSY-A15NA

 

MSZ-A24NA

MSZ-A12NA

MSY-A17NA

 

MSY-A24NA

MSZ-A15NA

Front panel

 

 

MSZ-A17NA

 

 

 

 

 

Air inlet

 

 

Panel

Heat exchanger

 

 

 

 

 

Air cleaning filter (Anti-Allergy Enzyme Filter, Blue bellows type)

Catechin air filter

Air outlet

Vertical vane

Remote controller

Horizontal vane

Line flow fan

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA

Operation section

Display section

(When the front panel is opened)

Operation Indicator lamp

Emergency operation switch

Remote control

 

receiving section

MSZ-A24NA MSY-A24NA

Operation indicator lamp

Emergency operation switch

Remote control receiving section

ACCESSORIES

 

 

MSZ-A09/12/15/17NA

MSZ-A09/12/15/17NA- 1

MSZ-A24NA

 

 

MSY-A15/17NA

MSY-A15/17NA- 1

MSY-A24NA

 

Installation plate

1

1

1

 

Installation plate fixing screw 4 × 25 mm

8

5

7

 

Remote controller holder

1

1

1

 

Fixing screw for 3.5 × 1.6 mm (Black)

2

2

2

 

Battery (AAA) for remote controller

2

2

2

 

Wireless remote controller

1

1

1

 

Felt tape (Used for left or left-rear piping)

1

1

1

 

Conduit plate

1

3

3

 

 

SPECIFICATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor unit model

 

 

 

MSZ-A09NA

 

MSZ-A12NA

External finish

 

 

 

 

 

 

White

 

 

Power supply

 

V, phase, Hz

 

208/230, 1, 60

 

 

Max.-fuse size (time delay) / Disconnect switch

 

A

 

 

 

15

 

 

Min. circuit ampacity

 

 

A

 

 

 

1.0

 

 

Fan motor

 

 

 

F.L.A

 

 

 

0.76

 

 

Airflow

 

COOL Dry (Wet)

 

152-229-307-338

 

152-240-353-388

 

CFM

(134-205-275-303)

 

(134-215-318-349)

Low–Med.–High–Powerful

HEAT

 

 

159-222-307-321

 

159-240-353-353

 

 

 

 

 

 

 

Moisture removal

 

 

pt./h

 

2.3

 

 

3.2

Sound level

 

COOL

 

dB(A)

22-33-38-41

 

22-34-42-44

Low–Med.–High–Powerful

HEAT

 

22-33-38-39

 

22-34-42-42

 

 

 

 

 

 

 

 

 

 

Cond. drain connection O.D.

 

 

in.

 

 

 

5/8

 

 

 

 

 

 

W

 

 

 

30-11/16

 

 

Dimensions

 

D

 

in.

 

 

 

8-/1/4

 

 

 

 

 

 

H

 

 

 

 

 

11-/3/4

 

 

Weight

 

 

 

Ib.

 

 

 

23

 

 

Remote controller

 

 

 

 

 

Wireless type

 

 

Control voltage (by built-in transformer)

 

 

 

 

12-24 VDC

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor unit model

 

 

 

MSZ-A15NA

 

MSY-A15NA

 

MSZ-A17NA

 

MSY-A17NA

External finish

 

 

 

 

 

 

White

 

 

Power supply

 

V, phase, Hz

 

208/230, 1, 60

 

 

Max.-fuse size (time delay) / Disconnect switch

 

A

 

 

 

15

 

 

Min. circuit ampacity

 

 

A

 

 

 

1.0

 

 

Fan motor

 

 

 

F.L.A

 

 

 

0.76

 

 

Airflow

 

COOL Dry (Wet)

CFM

 

268-328-381-419 (240-293-342-376)

 

 

Low–Med.–High–Powerful

HEAT

 

254-314-381-381

 

 

254-314-381-381

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Moisture removal

 

 

pt./h

 

4.7

 

 

5.1

Sound level

 

COOL

 

dB(A)

34-40-45-47

 

34-40-46-48

Low–Med.–High–Powerful

HEAT

 

34-38-44-44

 

 

34-38-44-44

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cond. drain connection O.D.

 

 

in.

 

 

 

5/8

 

 

 

 

 

 

W

 

 

 

30-/11/16

 

 

Dimensions

 

D

 

in.

 

 

 

8-/1/4

 

 

 

 

 

 

H

 

 

 

 

 

11-/3/4

 

 

Weight

 

 

 

Ib.

 

 

 

23

 

 

Remote controller

 

 

 

 

 

Wireless type

 

 

Control voltage (by built-in transformer)

 

 

 

 

12-24 VDC

 

 

 

 

 

 

 

 

 

Indoor unit model

 

 

 

MSZ-A24NA

 

MSY-A24NA

External finish

 

 

 

 

 

 

White

 

 

Power supply

 

V, phase, Hz

 

208/230, 1, 60

 

 

Max.-fuse size (time delay) / Disconnect switch

 

A

 

 

 

15

 

 

Min. circuit ampacity

 

 

A

 

 

 

1.0

 

 

Fan motor

 

 

 

F.L.A

 

 

 

0.76

 

 

Airflow

 

COOL Dry (Wet)

CFM

 

296-431-568-624 (265-385-508-558)

 

 

Low–Med.–High–Powerful

HEAT

 

296-486-568-590

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Moisture removal

 

 

pt./h

 

 

 

7.3

 

 

Sound level

 

COOL

 

dB(A)

 

34-40-49-51

 

 

Low–Med.–High–Powerful

HEAT

 

34-40-48-49

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cond. drain connection O.D.

 

 

in.

 

 

 

5/8

 

 

 

 

 

 

W

 

 

 

43-/5/16

 

 

Dimensions

 

D

 

in.

 

 

 

10-/1/4

 

 

 

 

 

 

H

 

 

 

12-13/16

 

 

Weight

 

 

 

Ib.

 

 

 

37

 

 

Remote controller

 

 

 

 

 

Wireless type

 

 

Control voltage (by built-in transformer)

 

 

 

 

12-24 VDC

 

 

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

1

: Rating conditions

(Cooling)

Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB)

2

:

(Heating)

Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB

(Heating)

Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB

4

3-1. OPERATING RANGE

(1) POWER SUPPLY

 

Rated voltage

Guaranteed Voltage (V)

 

 

 

 

 

 

 

 

 

208/230 V

Min.187 208

230 Max.253

Indoor unit

1 phase

 

 

 

 

 

 

 

 

 

 

 

 

 

60 Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(2) OPERATION

Mode

Condition

 

 

Intake air temperature (°F)

 

 

Indoor

 

 

Outdoor

 

 

DB

 

WB

DB

 

WB

 

Standard temperature

80

 

67

95

 

Cooling

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

14

 

13

3-2. OUTLET AIR SPEED AND COVERAGE RANGE

Model

Mode

Function

Air flow (CFM)

Air speed

Coverage

(ft./sec.)

range (ft.)

 

 

 

 

MSZ-A09NA

HEAT

Dry

307

16.8

23.4

COOL

Dry

307

16.8

23.4

 

Wet

275

15.1

21.0

 

 

MSZ-A12NA

HEAT

Dry

353

19.3

26.7

COOL

Dry

353

19.3

26.7

 

Wet

318

17.4

24.1

 

 

MSZ-A15NA

HEAT

Dry

381

20.9

28.8

MSZ-A15NA

COOL

Dry

381

20.9

28.8

MSY-A15NA

Wet

342

18.8

26.0

 

MSZ-A17NA

HEAT

Dry

381

20.9

28.8

MSZ-A17NA

COOL

Dry

381

20.9

28.8

MSY-A17NA

Wet

342

18.8

26.0

 

MSZ-A24NA

HEAT

Dry

568

20.2

34.4

MSZ-A24NA

COOL

Dry

568

20.2

34.4

MSY-A24NA

Wet

508

18.1

30.9

 

The air coverage range is the figure up to the position where the air speed is 1 ft./sec., when air is blown out horizontally from the unit properly at the High speed position.

The coverage range should be used only as a general guideline since it varies according to the size of the room and furniture arranged inside the room.

5

4 OUTLINES AND DIMENSIONS

MSZ-A09NA MSY-A15NA

Unit : inch

MSZ-A12NA MSY-A17NA

 

MSZ-A15NA

 

MSZ-A17NA

 

 

Conduit plate(MSZ-A•NA-

and MSY-A•NA-

are excluded.)

 

 

 

 

 

7/16x1 Oblong hole

7/16x13/16 Oblong hole

 

 

9/16

 

 

Installation plate

2-3/16

8-7/8

 

8-7/8

 

2-3/16

 

 

8-7/16

10-1/8

 

 

7/8

hole

8-7/16

9-3/16

10-3/4

11-5/16

30-11/16

 

 

 

 

7/8

 

1-5/8

 

6-1/8

6-1/8

1-3/4

 

11/16

 

1/8

 

2-3/16

13-3/16

 

12-5/8

2-3/4

 

 

Indoor unit

 

1-

 

 

 

 

Air in

 

 

 

Wall hole

2-9/16

 

 

 

 

 

 

 

 

 

8-1/4

3/16 Installation plate

 

 

 

11-3/4

 

 

 

 

 

{

Liquid line

1/4 19-11/16

 

 

 

 

 

Gas line

3/8 16-15/16

 

 

 

 

 

Insulation

3/4 I.D

 

 

 

 

 

 

 

1-3/8 O.D

 

 

 

 

Drain hose

5/8

2-1/8

24-9/16

4

Air out

(Connected part O.D)

 

 

 

Insulation

1-1/8

 

2-5/16

3/4

 

 

 

 

 

 

6-1/4

 

 

 

 

6

 

 

MSZ-A24NA

Unit : inch

MSY-A24NA

 

Installation plate

Indoor unit

3-7/8

6-13/16

5/16

42-1/16

1-7/8

43-5/16

12-13/16

2-3/16

31-1/8

9-15/16

2-5/16

3/4

 

6-1/4

 

 

Wireless remote controller

3-7/8 16-5/16

10-1/4

Air in

Air out

 

 

10-1/16

12-3/8

16-5/16 6-13/16

1/8

1-7/8

 

 

 

 

Wall hole 3 3/16

Installation plate

Liquid line

1/4

19-11/16

Gas line

5/8

16-15/16

{Insulation

1-15/16 O.D

 

1-1/4 I.D

Drain hose 5/8 (Connected part O.D)

Insulation 1-1/8

7

5 WIRING DIAGRAM

MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA

MSZ-A15NA

MSZ-A17NA

MSZ-A24NA

MSY-A24NA

8

6 REFRIGERANT SYSTEM DIAGRAM

MSZ-A09NA

MSZ-A12NA

Refrigerant pipe ø3/8 (with heat insulator)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor coil

Indoor

 

 

 

thermistor

heat

 

 

 

 

 

 

RT12(main)

exchanger

 

 

 

 

 

 

 

 

 

 

Flared connection

Indoor coil thermistor RT13(sub)

Room temperature thermistor

RT11

Flared connection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant pipe ø1/4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(with heat insulator)

MSZ-A24NA

 

 

 

 

 

 

 

 

 

 

MSY-A24NA

 

 

 

 

 

Refrigerant pipe ø5/8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(with heat insulator)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor coil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor

 

 

thermistor

 

 

 

 

 

 

 

 

heat

 

 

RT12(main)

 

 

 

 

 

 

 

 

exchanger

 

 

Distributor

 

 

Flared connection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor coil thermistor RT13(sub)

Room temperature thermistor

RT11

Flared connection

Refrigerant pipe ø1/4 (with heat insulator)

MSZ-A15NA

MSY-A15NA

Unit : inch

MSZ-A17NA MSY-A17NA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant pipe ø1/2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(with heat insulator)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor coil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor

 

 

thermistor

 

 

 

 

 

 

heat

 

 

RT12(main)

 

 

 

 

 

 

exchanger

 

 

Distributor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flared connection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Indoor coil thermistor RT13(sub)

Room temperature thermistor

RT11

Flared connection

Refrigerant pipe ø1/4 (with heat insulator)

Refrigerant flow in cooling

Refrigerant flow in heating

9

7 SERVICE FUNCTIONS

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA MSY-A17NA MSY-A24NA

7-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 8-7.)

Set time : 1-minute

1-second

Set time : 3-minute

3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is

 

shortened by short circuit-of JPG and JPS.)

7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION

A maximum of 4 indoor units with wireless remote controllers can be used in a room.

In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit.

How to modify the remote controller P.C. board

Remove batteries before modification. The board has a print as shown below :

 

NOTE : For modification, take out

 

the batteries and press

 

the OPERATE/STOP(ON/

 

OFF)button twice or 3

 

times at first.

 

After finish modification,

J1 J2

put back the batteries then

press the RESET button.

The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button.

Table 1

 

1 unit operation

2 units operation

3 units operation

4 units operation

No. 1 unit

No modification

Same as at left

Same as at left

Same as at left

No. 2 unit

Solder J1

Same as at left

Same as at left

No. 3 unit

Solder J2

Same as at left

No. 4 unit

Solder both J1 and J2

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit.

The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are set.

The setting will be cancelled if the breaker has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored.

10

7-3. AUTO RESTART FUNCTION

When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically.

Operation

If the main power has been cut, the operation settings remain.

After the power is restored, the unit restarts automatically according to the memory.

(However, it takes at least 3 minutes for the compressor to start running.)

How to release “AUTO RESTART FUNCTION”

Turn off the main power of the unit.

Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 8-7.)

MSZ-A09/12/15/17NA

MSZ-A24NA

MSY-A15/17NA

MSY-A24NA

CN211

CN211

JR07

BZ

CN151 CN112

JR07

BZ

 

CN152

CN112

 

 

CN101

 

CN151

NOTE:

The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller.

If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is cancelled.

If the unit has been OFF with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is off.

To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the same time.

When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart.

Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one.

8 TROUBLESHOOTING

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA MSY-A17NA MSY-A24NA

8-1. 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 unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.

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

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

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lead wiring

Housing point

11

3.Troubleshooting procedure

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

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

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

4)When troubleshooting, refer to 8-2., 8-3. and 8-4.

4.How to replace batteries

Weak batteries may cause the remote controller malfunction.

In this case, replace the batteries to operate the remote controller normally.

Remove the front lid and insert batteries. Then reattach the front lid.

Press RESET button with tip end of ball point pen or the like, and then use the remote controller.

Insert the negative pole of the

batteries first. Check if the polarity RESET button of the batteries is correct.

NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.

2.This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.

This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement.

INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT : MXZ series

Multi system air conditioner can connect two or more indoor units with one outdoor unit.

Unit won’t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not connect indoor units beyond the outdoor unit capacity.

Operation indicator lamp flashes as shown in the figure below.

When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode.

OPERATION INDICATOR

Lighted

Blinking

Not lighted

When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10 minutes) to blow out the warm air.

In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

12

8-2. FAILURE MODE RECALL FUNCTION

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 (8-4.) disappears, the memorized failure details can be recalled.

This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.

1. Flow chart of failure mode recall function for the indoor/outdoor unit Those figures show about MSZ-A09/12/15/17.

Operational procedure

The cause of abnormality cannot be found because the abnormality doesn't recur.

Setting up the failure mode recall function

Turn ON the power supply. <Preparation of the remote controller>

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.

And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds.

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

1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

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 emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. 2

 

 

Yes

Judgment of indoor/outdoor abnormality

 

(Blinks)

 

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.

No

No

(OFF)

Yes

Indoor unit is normal.

But the outdoor unit might be abnormal because there are some abnor- malities that can't be recalled with this way.

Confirm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function.

 

The indoor unit is abnormal.

 

The outdoor unit is abnormal.

 

Check the blinking pattern, and confirm the abnormal point with the indoor unit

 

Check the blinking pattern, and confirm the abnormal point with the

 

failure mode table. (8-2.2.)

 

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

 

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

 

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

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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.

NOTE: 1. Make sure to release the failure mode recall function once it's 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. Blinking pattern when the indoor unit is abnormal:

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5-second OFF

second interval

 

 

2.5-second OFF second interval

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Beeps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Beeps

 

 

 

 

 

 

 

Beeps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Repeated cycle

 

 

 

 

 

 

 

Repeated cycle

 

 

Repeated cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.Blinking pattern when the outdoor unit is abnormal:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blinking at 0.5-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5-second OFF

 

 

 

3-second ON

 

 

 

 

second interval

 

 

 

 

2.5-second OFF

3-second ON

 

second interval

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No beep

 

 

 

 

 

 

 

Beeps

 

 

 

 

 

 

 

 

 

 

 

 

 

No beep

 

 

 

 

 

Beeps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Repeated cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

Repeated cycle

 

 

 

 

 

 

 

 

 

 

Repeated cycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

2. Indoor unit failure mode table

Left lamp of OPERATION

Abnormal point

Condition

 

Correspondence

INDICATOR lamp

(Failure mode)

 

 

 

 

Not lighted

Normal

 

1-time flash every

Room temperature

The room temperature thermistor short or

Refer to the characteristics of the room temperature

open circuit is detected every 8 seconds dur-

0.5-second

thermistor

ing operation.

thermistor (8-7.).

 

 

 

 

2-time flash

Indoor coil

The indoor coil thermistor short or open circuit

Refer to the characteristics of the main indoor coil ther-

2.5-second OFF

thermistor

is detected every 8 seconds during operation.

mistor, the sub indoor coil thermistor (8-7.).

3-time flash

Serial signal

The serial signal from outdoor unit is not re-

Refer to 8-6.

"How to check miswiring and serial

2.5-second OFF

ceived for a maximum of 6 minutes.

signal error".

 

 

 

11-time flash

 

The rotational frequency feedback signal is

 

 

Indoor fan motor

not emit during the 12 seconds the indoor fan

Refer to 8-6.

"Check of indoor fan motor".

2.5-second OFF

 

operation.

 

 

 

 

 

 

12-time flash

Indoor control

It cannot properly read data in the nonvolatile

 

 

memory of the indoor electronic control P.C.

Replace the indoor electronic control P.C. board.

2.5-second OFF

system

board.

 

 

 

 

 

 

NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (8-4.).

14

8-3. INSTRUCTION OF TROUBLESHOOTING

Start

 

 

 

 

 

 

 

Indoor unit oper-

 

Indoor unit operates.

 

Indoor unit

 

OPERATION INDICATOR

ates.

 

Outdoor unit doesn't

 

doesn't receive

 

 

 

 

lamp on the indoor unit is

Outdoor unit

 

operate normally.

 

the signal from

 

 

 

 

flashing on and off.

doesn't operate.

 

 

 

remote controller.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If blinking of OPERATION INDI-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CATOR lamp cannot be checked,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

it can be checked with failure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

mode recall function.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Outdoor unit

 

Outdoor

 

Unit doesn't

 

Indoor unit

 

Indoor unit

 

operates only

 

unit doesn't

 

operate nor-

 

operates, when

 

doesn't operate,

 

in Test Run

 

operate even

 

mal operation

 

EMERGENCY

 

when EMER-

"Test Run operation" means

operation.

 

in Test Run

 

in COOL or

 

OPERATION

 

GENCY OPERA-

 

 

 

operation.

 

HEAT mode.

 

switch is pressed.

 

TION switch is

the operation within 30 minutes

 

 

 

 

 

 

 

 

 

 

 

 

pressed.

after EMERGENCY OPERA-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TION switch is pressed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check room

 

Refer to "How

 

Refer to

 

Refer to 8-6.

 

1. Check indoor/out-

 

temperature

 

to check

 

"Check of R.V.

 

"Check of remote

 

door connecting wire.

 

thermistor.

 

inverter/com-

 

coil".

 

controller and

 

(Check if the power is

 

Refer to 8-7.

 

pressor".

 

 

 

receiver P.C.

 

supplied to the indoor

 

"Test point

 

 

 

 

 

board".

 

unit.)

 

diagram and

 

 

 

 

 

 

 

2. Refer to 8-6. "Check

 

voltage".

 

 

 

 

 

 

 

of indoor electronic

 

 

 

 

 

 

 

 

 

control P.C. board and

Refer to outdoor unit service manual.

 

 

 

 

 

 

 

 

indoor fan motor".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Left lamp

Left lamp

 

Left lamp

 

 

Left lamp

Left lamp

 

Left lamp

Left lamp

 

Left lamp

 

 

Flash on and

2-time flash

 

3-time flash

4-time flash

 

5-time flash

6-time flash

 

7-time flash

14-time flash

off at 0.5-sec-

Cause:

 

Cause:

Cause:

 

Cause:

Cause:

 

Cause:

Cause:

ond intervals

Indoor unit

 

Indoor unit

Indoor unit

 

Outdoor unit

Outdoor unit

 

Outdoor unit

Outdoor unit

Cause:

• Trouble

 

• Trouble of

• Trouble

 

• Outdoor

• Trouble of

 

• Trouble of

• Other ab-

Indoor/Outdoor

of room

 

indoor fan

of indoor

 

power

thermistor in

 

outdoor con-

normality

unit

temperature

 

motor

unit control

 

system

outdoor unit

 

trol system

 

• Miswiring or

/ indoor coil

 

 

 

system

 

abnormality

 

 

 

 

trouble of

thermistor

 

 

 

 

 

 

 

 

 

 

 

 

serial signal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to 8-6.

Check room

 

Refer to 8-6.

 

Replace the

 

Refer to

 

Refer to

 

Check "Flow

"How to

temperature

 

"Check of

 

indoor elec-

 

"How to

 

"Check of

 

inverter P.C.

chart of the

check mis-

thermistor

 

indoor fan

 

tronic control

 

check

 

outdoor ther-

 

board or

detailed

wiring and

and indoor

 

motor".

 

P.C. board.

 

inverter/com-

 

mistors".

 

the outdoor

outdoor unit

serial signal

coil thermis-

 

 

 

 

 

pressor".

 

 

 

electronic

failure mode

error".

tor. Refer

 

 

 

 

 

 

 

 

 

 

control P.C.

recall func-

 

 

to 8-7."Test

 

 

 

 

 

 

 

 

 

 

board.

tion."

 

 

point diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and voltage".

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

8-4. TROUBLESHOOTING CHECK TABLE

Before taking measures, make sure that the symptom reappears for accurate troubleshooting.

When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.

OPERATION INDICATOR

Lighted

Blinking

 

 

Not lighted

 

 

 

 

No.

Abnormal

Operation indicator lamp

Symptom

Condition

Correspondence

point

 

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

 

Miswiring

0.5-second ON

 

 

• Refer to 8-6.

"How to check

 

 

 

The serial signal from the outdoor unit is not

1

or serial

 

 

miswiring and serial signal er-

 

 

received for 6 minutes.

 

signal

0.5-second OFF

 

ror".

 

 

 

 

 

 

 

 

 

 

 

 

Indoor coil

Left lamp flashes.

 

 

 

 

 

2-time flash

 

 

• Refer to 8-7. the characteristics

 

thermistor

 

 

 

 

 

The indoor coil or the room temperature ther-

2

 

 

 

of indoor coil thermistor, and

Room tem-

 

 

mistor is short or open circuit.

the room temperature thermis-

 

 

 

 

perature

2.5-second OFF

 

 

tor.

 

 

thermistor

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

 

 

3-time flash

 

 

 

 

3

Indoor fan

 

 

The rotational frequency feedback signal is

• Refer to 8-6.

"Check of in-

motor

 

 

not emitted during the indoor fan operation.

door fan motor".

 

2.5-second OFF

 

 

 

 

 

 

 

 

 

Left lamp flashes.

 

 

 

 

 

 

4-time flash

 

It cannot properly read data in the nonvolatile

 

 

4

Indoor con-

 

 

• Replace the indoor electronic

 

 

memory of the indoor electronic control P.C.

trol system

 

 

control P.C. board.

 

2.5-second OFF

 

board.

 

 

 

 

 

 

 

Indoor unit and

 

 

 

 

 

 

 

 

 

 

 

Left lamp flashes.

outdoor unit do

 

 

 

 

 

not operate.

 

• Refer to "How to check of in-

 

 

5-time flash

 

It consecutively occurs 3 times that the com-

 

Outdoor

 

 

verter/compressor".

 

 

 

pressor stops for overcurrent protection or

5

power sys-

 

 

Refer to outdoor unit service

 

 

start-up failure protection within 1 minute after

 

tem

 

 

manual

 

 

2.5-second OFF

 

start-up.

 

 

 

 

• Check the stop valve.

 

 

Left lamp flashes.

 

 

 

 

 

Outdoor

6-time flash

 

The outdoor thermistors short or open circuit

• Refer to "Check of outdoor

6

 

 

thermistor".

 

thermistors

 

 

during the compressor operation.

Refer to outdoor unit service

 

 

2.5-second OFF

 

 

manual.

 

 

 

Left lamp flashes.

 

 

• Replace the inverter P.C. board

 

Outdoor

7-time flash

 

It cannot properly read data in the nonvolatile

7

 

 

or the outdoor electronic con-

control sys-

 

 

memory of the inverter P.C. board or the out-

trol P.C. board.

 

tem

2.5-second OFF

 

door electronic control P.C. board.

Refer to outdoor unit service

 

 

 

 

manual.

 

 

 

Left lamp flashes.

 

 

 

 

 

Other ab-

14-time flash

 

An abnormality other than above mentioned

• Check the stop valve.

8

 

 

• Confirm the abnormality in

normality

 

 

is detected.

detail using the failure mode

 

 

2.5-second OFF

 

 

recall function for outdoor unit.

 

 

 

 

 

 

 

Outdoor

 

 

 

 

 

 

control

 

Outdoor unit

It cannot properly read data in the nonvolatile

• Check the blinking pattern of

 

system

 

 

 

the LED on the inverter P.C.

9

MSZ-A09/12

Left lamp lights up

does not opermemory of the inverter P.C. board or the out-

board or the outdoor electronic

 

/15/17

 

ate

door electronic control P.C. board.

control P.C. board.

 

MSY-A15/17

 

 

 

 

 

16

OPERATION INDICATOR

No.

Abnormal

 

 

Operation indicator lamp

Symptom

Condition

Correspondence

point

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Left lamp lights and lower lamp flashes.

 

 

 

 

MXZ type

Lower lamp flashes.

Outdoor unit

The operation mode of the each indoor unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

is differently set to COOL (includes DRY) and

• Unify the operation mode.

 

Operation

 

 

 

 

 

 

 

 

 

operates but

1

 

 

 

 

 

 

 

 

 

HEAT at the same time, the operation mode

Refer to outdoor unit service

 

mode

2.5-second OFF

indoor unit does

of the indoor unit that has operated at first has

manual.

 

setting

 

 

 

 

 

 

 

 

 

not operate.

the priority.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-5. TROUBLE CRITERION OF MAIN PARTS

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA MSY-A17NA MSY-A24NA

Part name

Check method and criterion

Figure

Room temperature

Measure the resistance with a tester.

 

thermistor(RT11)

 

Refer to 8-7. "Test point diagram and voltage",

Indoor coil thermistor "Indoor electronic control P.C. board", the chart of thermistor.. (RT12(MAIN),RT13(SUB))

Indoor fan motor(MF)

Check 8-6. .

 

 

 

 

Measure the resistance between the terminals with a tester.

RED

 

Horizontal vane

(Part temperature 50 ~ 86°F)

 

 

 

ROTOR

motor(MV)

Color of the lead wire

Normal

YLW

 

MSZ-A09/12/15/17NA

BRN-other one

235 ~ 255 Ω

BRN

 

MSY-A15/17NA

ORN

GRN

 

 

 

Horizontal vane

Measure the resistance between the terminals with a tester.

RED

 

(Part temperature 50 ~ 86°F)

 

 

motor(MV1)

 

ROTOR

Vertical vane

Color of the lead wire

Normal

YLW

 

motor(MV2)

BRN-other one

282 ~ 306 Ω

BRN

 

MSZ-A24NA

ORN

GRN

MSY-A24NA

 

 

 

 

 

 

17

8-6. TROUBLESHOOTING FLOW

A Check of indoor fan motor

The indoor fan motor error has occurred, and the indoor fan doesn't operate.

Turn OFF the power supply.

 

 

 

 

 

 

Pay careful attention to the high voltage on the fan motor connector CN211.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ON the power supply, wait 5 seconds or more, and then press

 

 

 

 

 

 

 

EMERGENCY OPERATION switch.

 

 

 

 

 

 

 

 

 

Measure the supply voltage as follows within 12 seconds after EMER-

 

 

Is there any foreign matter that interferes

 

 

 

GENCY OPERATION switch is pressed.

 

 

 

 

the rotation of the line flow fan?

 

No

 

If more than 12 seconds passes by, turn OFF the power supply and

 

 

 

 

 

 

 

turn ON it again, then measure the voltage.

 

 

 

 

Yes

 

 

 

1. Measure the voltage between CN211

(+) and

(-).

 

 

 

 

 

 

 

 

 

 

2. Measure the voltage between CN211

(+) and

(-).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If more than 12 seconds passes after EMERGENCY OPERATION switch

 

 

 

 

 

 

Remove the foreign matter and

 

 

 

 

adjust the line flow fan.

 

 

 

is pressed, the voltage mentioned above 2 goes 0 VDC although the

 

 

 

 

 

 

indoor electronic control P.C. board is normal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is there 294/325 VDC between

 

 

 

CN211

CN211 (+) and (-), and does the

 

 

 

Indoor electronic

voltage between CN211 (+) and (-)

 

 

Replace the indoor fan motor.

control P.C. board

 

 

rise to the range of 3 to 6 VDC within

Yes

 

 

12 seconds after EMERGENCY

 

 

 

 

OPERATION switch is pressed?

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the indoor electronic control P.C. board.

The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.

Measure the voltage between CN211 (+) and (-) while the fan motor is rotating.

Is it unchanged holding

 

 

Replace the indoor electronic control P.C. board.

0 or 15 VDC?

No

 

 

(Changed)

 

Yes

(Unchanged)

Replace the indoor fan motor.

18

B Check of remote controller and indoor electronic control P.C. board

Check if the remote controller is exclusive for this air conditioner.

Press OPERATE/STOP (ON/OFF)

button on the remote controller.

Is LCD display on the remote controller visible?

Yes

Remove the batteries, then set them back and press RESET button. (Refer to 8-1.4.) Check if the unit operates with the remote controller.

Does the unit operate with the remote controller?

Yes

OK

 

 

Replace the batteries. (Refer to 8-1.4.)

No

 

(Not clear)

 

 

 

Turn ON a radio to AM and press OP-

 

 

ERATE/STOP (ON/OFF) button on the

No

 

remote controller.

 

 

 

 

 

 

 

 

 

 

Is noise heard from radio?

Yes

Are there any fluorescent lights of inverter or rapid-start type within the range of 3.28 ft.?

No

MSZ-A24NA

MSY-A24NA

 

 

Replace the remote controller.

No

 

 

 

 

•Reinstall the unit away from lights.

Yes

 

•Attach a filter on receiving part.

 

 

 

MSZ-A09/12/15/17NA

MSY-A15/17NA

Measure the voltage between receiver P.C. board connector CN301 No.2(+) and No.3(-) when the remote controller button is pressed.

Is the voltage approx. 4 VDC?

 

Replace the indoor electronic control

Yes

P.C. board.

 

No (5 or 0 VDC)

Replace the receiver P.C. board.

19

C Check of indoor electronic control P.C. board and indoor fan motor

Turn OFF the power supply.

Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply.

Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch?

No

Turn OFF the power supply.

Check both “parts side” and “pattern side” of the indoor electronic control P.C. board visually.

Measure the resistance between

 

 

 

 

 

Short/open circuit:

CN211 and of the indoor fan motor

 

 

 

 

Replace the indoor fan motor.

connector.

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

Measure the resistance of the horizon-

 

 

Short/open circuit:

tal vane motor coil.

 

 

Replace the horizontal vane motor and the

 

 

(Refer to 8-5.)

 

 

indoor electronic control P.C. board.

 

 

 

 

Replace the indoor electronic control P.C. board.

Yes

Are the varistor (NR11) burnt and the fuse (F11)

blown? No

Be sure to check both the fuse and the varistor in any case.

Is the fuse (F11) blown

only? No

Yes

Measure the resistance between

(+) and (-) of the indoor fan motor connector (to CN211 on the indoor electronic control P.C. board). 1, 2

Is the resistance 1 MΩ

or more?

No

Yes

1. The fan motor connector's lead wire is red, whereas is black.

2. Connect "+" of the tester to fan motor connector's lead wire, and "-" to lead wire, otherwise the resistance cannot be measured properly.

Replace indoor electronic control P.C. board and the indoor fan motor.

Replace indoor electronic control P.C. board.

Measure the resistance of cement resistor (R111) on the indoor elec-

tronic control P.C. board.

Is the resistance approx.

 

 

Replace the indoor electronic control P.C.

4 Ω?

No

 

board and the indoor fan motor.

Yes

Replace the indoor electronic control P.C. board.

Indoor electronic control P.C.Board

Varistor(NR11)

Fuse(F11) CN211

20

D How to check miswiring and serial signal error

Turn OFF the power supply.

A

Turn OFF inverter-controlled lighting equipment.

Turn OFF the power supply and then turn ON again.

Press EMERGENCY OPERATION switch.

Reinstall either the unit or the light

 

 

 

 

 

each other

Is serial signal

 

 

 

away.

error indicated 6

 

 

 

• Attach a filter

 

No

minutes later?

 

 

 

on remote

 

Yes

 

 

 

control

 

 

 

 

 

 

 

 

receiving

 

 

 

 

 

 

 

 

 

 

section of the

 

 

 

 

 

 

 

 

 

indoor unit.

B

 

 

 

Is there rated voltage in the

 

 

 

 

 

Check the power supply.

power supply?

No

 

 

 

Yes

Turn ON the power supply.

Is there rated voltage between

 

outdoor terminal block S1 and

No

S2?

 

 

Yes

 

 

 

Press EMERGENCY OPERATION switch once.

Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

Check the wiring.

No

 

 

 

 

 

 

Is there any miswiring, poor

 

 

 

 

contact, or wire disconnec-

 

 

 

 

 

 

Correct them.

No

tion of the indoor/outdoor

Yes

 

 

 

 

connecting wire?

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn OFF the power supply.

 

 

 

 

 

B

Check once more if the indoor/outdoor

 

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

connecting wire is not miswiring.

 

 

board during the operation.

 

 

Short-circuit outdoor terminal block S2

 

 

 

 

Be sure to confirm the wiring is correct before the opera-

 

 

and S3. 1

 

 

 

 

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.

 

 

Turn ON the power supply.

 

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

 

 

 

 

 

(Except for outdoor unit of multi system type)

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

Replace the inverter P.C. board or

 

 

the outdoor electronic control P.C. board

 

 

 

 

 

 

 

 

the outdoor electronic control P.C. board.

 

 

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

 

No

 

 

 

 

 

2

 

 

ON quick blinking"? 3

 

(Lighted

 

 

 

 

 

 

 

 

 

 

Yes

 

or not

 

2. Be careful to the residual

 

 

 

 

 

 

 

 

 

lighted)

 

voltage of smoothing capacitor.

 

 

 

 

 

Turn OFF the power supply.

 

Is there any error of the in-

 

 

 

 

Remove the short-circuit between

 

 

 

 

 

outdoor terminal block S2 and S3.

 

door/outdoor connecting wire,

 

 

 

Replace the indoor/

Turn ON the power supply.

 

such as the damage of the wire,

 

 

 

outdoor connecting

No

Yes

Is there amplitude of 10 to 20 VDC

 

intermediate connection, poor

 

 

 

wire.

between outdoor terminal block S2 and

 

contact to the terminal block?

 

 

 

 

 

 

 

 

 

S3? <Confirmation of serial signal>

 

 

No

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

Is there any error of the in-

 

 

 

 

Is there rated voltage between

 

 

 

 

 

 

door/outdoor connecting wire,

 

 

 

Replace the indoor/

indoor terminal block S1 and S2?

No

such as the damage of the wire,

 

 

 

 

outdoor connecting

 

Yes

 

<Confirmation of power voltage>

 

intermediate connection, poor

 

 

 

wire.

 

Yes

 

contact to the terminal block?

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the indoor electronic control P.C. board.

Be sure to release the failure-mode recall function after checking.

21

E Electromagnetic noise enters into TV sets or radios

Is the unit grounded?

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.?

No

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.?

No

No

Yes

Yes

Ground the unit.

Extend the distance between the antennas and the indoor unit, and/or the antennas and the

outdoor unit.

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- Yes na wiring?

No

 

Is the indoor/outdoor connecting wire of

 

the air conditioner and the wiring of the

Yes

antennas close?

No

 

Replace or repair the antenna.

Replace or repair the coaxial cable.

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 fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific 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 field intensity of the broadcast station affected by the electromagnetic noise

6.Presence or absence of amplifier 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 electromagnetic 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.

22

8-7. Test point diagram and voltage

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA

Indoor electronic control P.C. board

Varistor (NR11)

Cement resistor (R111)

Release of Auto restart function

Solder the Jumper wire to JR07

(Refer to 7-3.)

Power monitor receiver P.C. board

Emergency

SW P.C. board

operation switch

Power supply input

 

208/230 VAC

Fuse (F11)

}

250 V 3.15 A

Indoor fan motor (CN211)

294/325 VDC

(-) Fiducial terminal of cathode side on measuring high-voltage DC

15 VDC (+)3-6 VDC

(+)0 or 15 VDC

5 VDC

Indoor coil thermistor RT12(MAIN) RT13(SUB)

(CN112)

Horizontal vane motor(CN151)

Room temperature thermistor (RT11)

}Timer short mode point JPG, JPS (Refer to 7-1.)

12 VDC

Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)]

Room temperature thermistor (RT11)

Resistance (k )

Temperature (°F)

23

MSZ-A24NA MSY-24NA

Indoor electronic control P.C. board

 

 

Cement

 

 

Release of Auto restart

 

Power supply input

 

resistor

 

function

 

(R111)

Varistor (NR11)

208/230 VAC

Solder the Jumper wire

 

 

 

}

to JR07

 

 

 

 

 

 

 

 

(Refer to 6-3.)

 

 

 

 

 

 

 

 

 

Fuse (F11)

250 V 3.15 A

Display P.C. board

Receiver

P.C. board

Indoor fan motor (CN211)

294/325 VDC

(-) Fiducial terminal of cathode side on measuring high-voltage DC

15 VDC (+)3-6 VDC

(+)0 or 15 VDC

5 VDC

Indoor coil thermistor RT12(MAIN) RT13(SUB)

Horizontal vane motor (CN151)

Room temperature thermistor (RT11)

}Timer short mode point JPG, JPS (Refer to 7-1.)

12 VDC Vertical vane motor (CN152)

Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)]

Room temperature thermistor (RT11)

SW P.C. board

Resistance (k )

Temperature (°F)

24

9 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.

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

Sleeve

Slide the sleeve.

Pull the terminal while

Locking lever pushing the locking lever.

(2)The terminal with this connector has the locking mechanism.

Hold the sleeve, and pull out the terminal slowly.

Connector

9-1. MSZ-A09NA MSZ-A12NA MSZ-A15NA

MSZ-A17NA MSY-A15NA MSY-A17NA

OPERATING PROCEDURE

PHOTOS

1. Removing the panel

Photo 1

(1)Remove the horizontal vane.

(2)Remove the screw caps of the panel. Remove the screws. (Photo 1)

(3)Hold the lower part of both ends on the panel and pull it slightly toward you, and then remove the panel by pushing it upward.

Photo 3

 

 

Screws of the panel

Screw of the

Horizontal vane

conduit cover

 

Terminal block

 

cover

 

 

Photo 2

Conduit cover

 

 

Terminal block

 

cover

 

Conduit cover

MSZ-A09/12/15/17NA - 1

Screw of the

MSY-A15/17NA - 1

conduit cover

 

 

Conduit plate

 

MSZ-A09/12/15/17NA

 

MSY-A15/17NA

25

 

 

OPERATING PROCEDURE

PHOTOS

2. Removing the electronic control P.C. board, the

Photo 4

power monitor receiver P.C. board, SW P.C. board

 

and the terminal block

 

(1)Remove the horizontal vane, the panel (refer to 1.) and the corner box.

(2)Remove the screw of the conduit cover, and conduit cover. (Photo 2 or Photo 3)

(3)Remove the indoor/outdoor connecting wire.

(4)

Remove the switch holder from the electrical cover. (Photo

 

Switch holder

 

4)

 

 

(5)

Remove the screw of the electrical cover, and then the

 

 

 

electrical cover. (Photo 4)

 

Screw of the

(6)

Remove the ground wire connected to the indoor electronic

 

 

control P.C. board from the electrical box. (Photo 5)

 

electrical cover.

(7)

Unhook the power monitor receiver P.C. board holder from

 

 

 

the catch. (Photo 4)

 

Power monitor

(8)

Open the rear cover of the power monitor receiver P.C.

 

receiver

 

board holder and pull out the power monitor receiver P.C.

 

P.C. board holder

 

board.

 

 

(9)

Open the switch holder and pull out SW P.C. board.

Photo 5

 

(10)

Pull the electronic control P.C. board slightly toward you

Ground wire

 

 

from the electrical box, and disconnect TAB3 and all the

 

 

 

connectors on the electronic control P.C. board. (LD101

 

Indoor fan motor

 

and LD105 are direct-mounted to the electronic control P.C.

 

 

 

connector (CN211)

 

board.)

 

 

 

Indoor coil thermistor

(11) Pull out the electronic control P.C. board from the electrical

 

 

box.

 

connector (CN112)

(12)

Remove the ground wire connected to the heat exchanger

 

 

 

from the electrical box. (Photo 5)

 

 

(13)

Unhook the catches of the electrical box, and pull out the

 

Vane motor

 

electrical box.

 

 

 

connector (CN151)

(14)

Remove the screw of the terminal block cover, and then

 

 

 

 

remove the terminal block cover and the terminal block

 

 

 

holder. (Photo 6)

 

 

(15)

Remove the terminal block by sliding it.

 

 

3. Removing the electrical box

Photo 6

 

(1)Remove the horizontal vane, the panel (refer to 1.) and the corner box.

(2)Remove the screw of Conduit cover, and then the indoor/ outdoor connecting wire. (Photo 2 or Photo 3)

(3)Remove the switch holder and the electrical cover. (Photo 4)

(4)Remove the ground wire connected to the heat exchanger from the electrical box. (Photo 5)

(5)Disconnect the following connectors on the electronic control P.C. board; the fan motor connector <CN211>, the indoor coil thermistor connector <CN112>, the vane motor connector <CN151>. (Photo 5)

(6)Unhook the catches of the electrical box, and pull out the electrical box.

Screw

26

 

 

OPERATING PROCEDURE

PHOTOS

4. Removing the horizontal vane motor unit

Photo 7

(1) Remove the horizontal vane, the panel (refer to 1.) and the

 

corner box.

 

(2) Remove the screws of the horizontal vane motor unit, and

Screws of the

pull out the horizontal vane motor unit. (Photo 7)

horizontal vane

(3) Disconnect the connector from the horizontal vane motor

motor unit

unit.

 

5. Removing the indoor fan motor and the line flow fan Photo 8

Motor band

(1)

Remove the horizontal vane, the panel (refer to 1.) and the

 

 

 

 

corner box.

 

 

(2)

Remove the switch holder and the electrical box. (Refer to 3.)

 

 

(3)

Remove the drain hose from the nozzle assembly, and

 

 

 

remove the nozzle assembly.

 

 

(4)

Remove the screws fixing the motor bed. (Photo 8)

 

 

(5) Loosen the screw fixing the line flow fan. (Photo 9)

 

 

(6)

Remove the motor bed together with fan motor and motor

 

 

 

band.

 

 

(7)

Release the hooks of the motor band, and remove the

 

 

 

motor band then pull out the indoor fan motor.

 

 

(8)

Remove the screws fixing the left side of the heat exchang-

Screws of

 

 

er. (Photo 10)

 

 

the motor

 

(9)

Lift the heat exchanger, and pull out the line flow fan to the

 

bed

 

 

lower-left.

 

 

 

 

 

 

Photo 9

 

Screw of the line flow fan

Photo 10

Screws of the left side of the heat exchanger

27

9-2.MSZ-A24NA MSY-A24NA

OPERATING PROCEDURE

 

PHOTOS

1. Removing the front panel

Photo 1

(1) Remove the screw caps of the front panel. Remove the

 

Front panel

 

screws.

 

 

 

(2)Pull the panel down to your side slightly and unhook the catches at the top.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corner box

 

 

 

 

 

 

 

Screws

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Removing the electronic control P.C. board, the receiver

Photo 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Screw of the ground wire

 

 

 

 

 

P.C. board and the display P.C. board

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

Remove the front panel. (Refer to 1.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(2)

Remove the corner box

 

 

 

 

 

 

 

 

 

 

 

Indoor

 

 

 

 

 

 

(3)

Remove the screw of the electrical cover.

 

 

 

 

 

 

 

 

 

 

 

electronic

 

 

 

 

 

 

 

Remove the electrical cover and T.B. SW cover.

 

 

 

 

 

 

 

 

 

 

 

control

 

 

 

 

 

 

(4)

Remove the screw of the ground wire, which is solder-

 

 

 

 

 

 

 

 

 

 

 

P.C. board

 

 

 

 

 

 

 

mounted to the electronic control P.C. board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(5)

Remove the R.L holder.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(6)

Remove the screw of the conduit cover.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T.B. SW cover

 

(7)

Remove the conduit cover.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(8)

While pulling the electronic control P.C. board forward little

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

by little, disconnect all the connectors from the board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Screw of

 

 

(9)

Remove the electronic control P.C. board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T.B. SW cover

 

 

(10) Open the R.L holder, remove the receiver P.C. board and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Screw of the

 

 

 

the display P.C. board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

electrical cover

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Conduit cover

 

 

 

 

 

 

 

 

 

 

Receiver

 

 

 

 

 

 

 

 

 

 

P.C. board

 

 

 

R.L

 

Screw of

 

 

 

 

holder

 

conduit cover

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3. Removing the electrical box

Photo 3

 

 

Screw of the

(1)

Remove the front panel. (Refer to 1.)

 

 

 

 

ground wire

 

 

 

 

 

 

 

 

 

 

 

 

 

(2)

Remove the electrical cover. (Refer to 2.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(3)

Disconnect the connector of the indoor coil thermistors.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(4)

Disconnect the indoor fan motor connector (CN211) and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the vane motor connector (CN151 and CN152) on the elec-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tronic control P.C. board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(5)

Remove the screw of ground wire to the heat exchanger.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(6)

Remove the fan motor lead wire and indoor coil thermistor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

from the electrical box.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(7)

Remove the lead wire of vane motor from the bottom of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

electrical box.

 

 

 

 

 

 

 

Screw of the

 

 

 

 

 

(8)

Remove the screw fixing the electrical box and remove the

 

 

 

 

 

 

 

electrical box

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

electrical box.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28

 

 

 

 

 

 

 

 

OPERATING PROCEDURE

 

PHOTOS

 

 

4. Removing the vane motor

Photo 4

 

 

(1)

Remove the front panel. (Refer to 1.)

 

 

 

 

 

(2)

Remove the electrical cover. (Refer to 2.)

 

 

 

 

 

 

Vane motors

 

 

Screws

(3)

Remove the lead wire of vane motor. (Refer to 3.)

 

 

 

of the

 

 

 

 

(4)

Remove the R.L. holder.

 

 

 

vane

 

(5) Pull out the drain hose from the nozzle assembly and remove

 

 

 

motor

 

 

the nozzle assembly.

 

 

 

 

 

 

 

 

 

 

 

(6)Remove the screws of the vane motor and disconnect the connector.

(7) Remove the vane motor.

Photo 5

Screws of the

vane motor

Vane motor

5. Removing the line flow fan and the indoor fan motor

Photo 6

(1)

Remove the front panel. (Refer to 1.)

 

 

(2)

Remove the electrical box. (Refer to 3.)

 

 

(3)

Remove the drain hose from the nozzle assembly and

 

 

 

remove the nozzle assembly.

 

 

(4)

Remove the water cut.

 

 

 

Screws fixing

(5)

Slide the hole cover and remove the hole cover.

 

the left side

(6)

Remove the hexagon socket set screw from the line flow fan.

 

of the heat

(7)

Remove the screws fixing the motor bed and remove the fan

 

exchanger

 

motor. (Be careful not to drop the fan motor because it is

 

 

 

heavy.)

 

 

(8)

Remove the screws fixing the left side of the heat exchang-

 

 

 

er.

Photo 7

(9)Lift the left side of the heat exchanger.

(10)Remove the line flow fan.

Water cut

Photo 8

Hole

cover

Screws of the motor bed

29

10 PARTS LIST

10-1. PARTS LIST (non-RoHS compliant) MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA MSZ-A15NA

MSZ-A17NA

1. INDOOR UNIT STRUCTURAL PARTS

1

2

3

4

 

2. ACCESSORY AND REMOTE

9

CONTROLLER

 

10

11

12

 

 

8

 

 

7

(See 10-1.5.)

56

1.INDOOR UNIT STRUCTURAL PARTS

 

 

 

Symbol

 

 

Q'ty/unit

 

 

 

 

No.

Part No.

Part name

in Wiring

 

MSZ-

 

MSY-

 

Remarks

 

 

 

Diagram

A09NA

A12NA

A15NA

A17NA

A15NA

A17NA

 

1

E02 A32 234

BOX

 

1

1

1

1

1

 

1

 

2

E02 A49 000

PANEL ASSEMBLY

 

1

1

1

1

1

 

1

Including No.3,4

3

E02 913 067

SCREW CAP

 

2

2

2

2

2

 

2

2 PC/SET

4

E02 915 010

FRONT PANEL

 

1

1

1

1

1

 

1

 

5

E02 915 100

CATECHIN AIR FILTER (LEFT)

 

1

1

1

1

1

 

1

 

6

E02 916 100

CATECHIN AIR FILTER (RIGHT)

 

1

1

1

1

1

 

1

 

7

AIR CLEANING FILTER

 

1

1

1

1

1

 

1

MAC-415FT-E

8

E02 A32 975

CORNER BOX (RIGHT)

 

1

1

1

1

1

 

1

 

9

E02 913 970

INSTALLATION PLATE

 

1

1

1

1

1

 

1

 

10

E02 A49 978

CONDUIT PLATE

 

1

1

1

1

1

 

1

 

2. ACCESSORY AND REMOTE CONTROLLER

11

E02 A54 426

REMOTE CONTROLLER

 

1

1

1

1

 

 

KM06A

E02 A49 426

 

 

 

 

 

1

1

KM06C

12

E02 527 083

REMOTE CONTROLLER

 

1

1

1

1

1

1

 

HOLDER

 

 

30

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

1

18

17

16

15

14

2

3

4

5

6

 

 

 

 

11

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

 

 

12

7

8

 

 

12

13

 

No.

Part No.

Part name

Symbol

 

 

Q'ty/unit

MSY-

Remarks

in Wiring

 

MSZ-

 

 

 

 

Diagram

A09NA

A12NA

A15NA

A17NA

A15NA

A17NA

 

1

E02 751 509

BEARING MOUNT

 

1

1

1

1

1

1

 

2

E02 001 504

SLEEVE BEARING

 

1

1

1

1

1

1

 

3

E02 897 702

DRAIN HOSE

 

1

1

1

1

1

1

 

4

E02 A54 235

NOZZLE ASSEMBLY

 

1

1

 

 

 

 

 

E02 A56 235

 

 

 

1

1

1

1

 

5

E02 897 303

VANE MOTOR UNIT

MV

1

1

1

1

1

1

UP & DOWN

(HORIZONTAL)

 

 

 

 

 

 

 

 

 

 

6

E02 913 040

HORIZONTAL VANE

 

1

1

1

1

1

1

 

7

E02 915 095

POWER MONITOR RECEIVER

 

1

1

1

1

1

1

 

P.C. BOARD HOLDER

 

 

 

 

 

 

 

 

 

 

 

 

8

E02 A49 979

CONDUIT COVER

 

1

1

1

1

1

1

 

9

E02 A49 780

TERMINAL BLOCK COVER

 

1

1

1

1

1

1

 

10

E02 A49 779

TERMINAL BLOCK HOLDER

 

1

1

1

1

1

1

 

11

E02 913 375

TERMINAL BLOCK

TB

1

1

1

1

1

1

 

 

E02 A54 452

 

 

1

 

 

 

 

 

 

 

E02 A55 452

 

 

 

1

 

 

 

 

 

12

E02 A56 452

ELECTRONIC CONTROL P.C.

 

 

 

1

 

 

 

 

E02 A57 452

BOARD 1

 

 

 

 

1

 

 

 

 

E02 A51 452

 

 

 

 

 

 

1

 

 

 

E02 A52 452

ROOM TEMPERATURE

 

 

 

 

 

 

1

 

13

E02 897 308

RT11

1

1

1

1

1

1

 

THERMISTOR

 

 

E02 A54 307

RT12,

1

1

 

 

 

 

 

14

INDOOR COIL THERMISTOR

 

 

 

 

 

E02 A56 307

RT13

 

 

1

1

1

1

 

 

 

 

 

 

15

E02 915 782

SWITCH HOLDER

 

1

1

1

1

1

1

RC0J30-□□

16

E02 A54 300

INDOOR FAN MOTOR W2

MF

1

1

1

1

1

1

17

E02 897 333

MOTOR BAND

 

1

1

1

1

1

1

 

18

E02 897 302

LINE FLOW FAN

 

1

1

1

1

1

1

 

1 Including SW P.C. BOARD and POWER MONITOR RECEIVER P.C. BOARD

2 Including FAN MOTOR RUBBER MOUNT (2 PC/SET)

31

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA 4. INDOOR UNIT HEAT EXCHANGER

1

2

3

 

 

 

Symbol

 

 

 

Q'ty/unit

 

 

 

 

No.

Part No.

Part name

in Wiring

 

 

MSZ-

 

MSY-

 

Remarks

 

 

 

Diagram

A09NA

A12NA

A15NA

A17NA

A15NA

A17NA

 

1

E02 A54 620

INDOOR HEAT EXCHANGER

 

1

1

 

 

 

 

 

 

 

E02 A56 620

 

 

 

 

1

1

1

 

1

 

2

E02 815 666

UNION (GAS)

 

1

1

 

 

 

 

 

 

ø3/8

E02 155 666

 

 

 

 

1

1

1

 

1

ø1/2

3

E02 151 667

UNION (LIQUID)

 

1

1

 

1

1

1

 

1

ø1/4

5.AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)

AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.

Normal life of AIR CLEANING FILTER is 1 year.

If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm water) and rinse it delicately, without removing the filter from the frame about once every 3 months.

Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.

Do not remove or attach AIR CLEANING FILTER during unit operation.

Model

Part No.

MSZ-A09/12/15/17NA MAC-415FT-E

MSY-A15/17NA

Replacement of the air cleaning filter

(1)Remove the catechin air filter (left one). The air cleaning filter is not attached to the right side catechin air filter.

(2)Remove the air cleaning filter (Blue bellows type) from the catechin air filter.

Air cleaning filter (Blue bellows type)

32

MSZ-A24NA

 

 

 

 

 

MSY-A24NA

 

 

7. INDOOR UNIT HEAT EXCHANGER

6. INDOOR UNIT STRUCTURAL PARTS

1

 

 

 

 

 

2

 

 

 

 

 

3

 

 

11

 

 

 

 

 

 

 

4

 

 

8

 

 

 

 

 

 

 

5

 

 

9

 

 

 

 

(See 10-1.10.)

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

13

 

 

6

 

 

 

 

 

 

 

7

 

 

 

 

6. INDOOR UNIT STRUCTURAL PARTS

 

 

 

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

 

 

 

No.

Part No.

Part Name

Symbol

Q'ty/unit

Remarks

in Wiring

MSZ-A24NA

MSY-A24NA

 

 

 

Diagram

 

1

E02 527 970

INSTALLATION PLATE

1

1

 

 

 

2

E02 685 234

BOX

 

1

1

 

3

E02 888 000

FRONT PANEL ASSEMBLY

 

1

1

Including No.5,6

4

E02 408 142

CATCH

 

4

4

4 PC/SET

5

E02 685 067

SCREW CAP

 

3

3

3 PC/SET

6

E02 888 010

GRILLE

 

1

1

 

7

E02 534 100

CATECHIN AIR FILTER

 

2

2

1 PC/SET

8

E02 685 975

CORNER BOX (RIGHT)

 

1

1

 

9

-—

AIR CLEANING FILTER

 

2

2

MAC-2300FT

10

E02 888 007

LAMP PANEL

 

1

1

 

7. INDOOR UNIT HEAT EXCHANGER

 

 

 

 

11

E02 A58 620

INDOOR HEAT EXCHANGER

 

1

1

 

12

E02 527 666

UNION (GAS)

 

1

1

ø5/8

13

E02 151 667

UNION (LIQUID)

 

1

1

ø1/4

33

MSZ-A24NA

 

 

 

 

 

MSY-A24NA

 

 

 

9. ACCESSORY AND

 

8. INDOOR UNIT FUNCTIONAL PARTS AND

 

 

ELECTRICAL PARTS

 

 

 

REMOTE CONTROLLER

1

18

 

17

21

22

2

 

 

 

 

 

 

 

 

3

 

 

 

 

 

4

 

9

 

 

 

10

 

16

 

 

 

 

 

 

 

 

5

 

 

 

 

 

6

12

11

 

15

 

 

 

 

8

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

13 14 15

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

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

 

 

 

 

Symbol

Q'ty/unit

 

No.

Part No.

Part Name

 

in Wiring

MSZ-A24NA

MSY-A24NA

Remarks

 

 

 

 

Diagram

 

 

 

 

 

 

 

 

1

E02 527 302

LINE FLOW FAN

 

 

1

1

 

2

E02 408 509

BEARING MOUNT

 

 

1

1

 

3

E02 001 504

SLEEVE BEARING

 

 

1

1

 

4

E02 408 702

DRAIN HOSE

 

 

1

1

 

5

E02 A58 235

NOZZLE

 

 

1

1

 

6

E02 685 040

VANE UPPER

 

 

1

1

 

7

E02 685 041

VANE LOWER

 

 

1

1

 

8

E02 527 034

VANE CRANK SET

 

 

1

1

 

9

E02 A58 300

INDOOR FAN MOTOR ASSEMBLY 1

 

MF

1

1

RC0J56-□□

10

E02 448 303

VANE MOTOR (VERTICAL)

 

MV2

2

2

RIGHT & LEFT

11

E02 408 303

VANE MOTOR (HORIZONTAL)

 

MV1

1

1

UP & DOWN

12

E02 918 333

MOTOR BAND

 

 

1

1

 

13

E02 918 329

DISPLAY P.C. BOARD

 

 

1

1

 

14

E02 918 468

RECEIVER P.C. BOARD

 

 

1

1

 

15

E02 A58 452

ELECTRONIC CONTROL P.C. BOARD

2

 

1

 

 

E02 A53 452

 

 

1

 

16

E02 527 308

ROOM TEMPERATURE THERMISTOR

 

RT11

1

1

 

17

E02 A58 375

TERMINAL BLOCK

 

TB

1

1

 

18

E02 918 307

INDOOR COIL THERMISTOR

 

RT12,

1

1

 

 

RT13

 

 

 

 

 

 

 

 

19

E02 528 034

VANE MOTOR SUPPORT SET(RIGHT)

 

 

1

1

 

20

E02 529 034

VANE MOTOR SUPPORT SET(LEFT)

 

 

1

1

 

1 Including FAN MOTOR RUBBER MOUNT

 

 

 

 

 

2 Including SW P.C. BOARD

 

 

 

 

 

9. ACCESSORY AND REMOTE CONTROLLER

 

 

 

21

E02 A58 426

REMOTE CONTROLLER

 

 

1

 

KM06B

E02 A53 426

 

 

 

1

KM06D

 

 

 

 

 

22

E02 527 083

REMOTE CONTROLLER HOLDER

 

 

1

1

 

34

10.AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)

AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.

Normal life of AIR CLEANING FILTER is 1 year.

If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm water) and rinse it delicately, without removing the filter from the frame about once every 3 months.

Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.

Do not remove or attach AIR CLEANING FILTER during unit operation.

Model

Part No.

 

 

 

 

 

MSZ-A24NA

MAC-2300FT

 

 

 

 

 

 

 

 

 

 

MSY-A24NA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Air cleaning filter

(Anti-allergy enzyme filter:blue bellows type)

35

10-2. RoHS PARTS LIST (RoHS compliant) MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA MSZ-A15NA

MSZ-A17NA

1. INDOOR UNIT STRUCTURAL PARTS

1

2

3

4

5 6

 

2. ACCESSORY AND REMOTE

9

CONTROLLER

 

10

11

12

 

 

8

 

 

7

(See 10-2.5.)

1. INDOOR UNIT STRUCTURAL PARTS

 

RoHS

 

 

Symbol

 

 

 

 

 

Q'ty/unit

 

 

 

 

 

 

 

 

 

 

 

 

MSZ-A

 

 

 

 

MSY-A

 

 

No.

Part No.

Part name

in Wiring

 

 

 

 

 

 

 

 

Remarks

09NA

12NA

15NA

17NA

15NA

17NA

 

 

 

 

Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- 1

 

- 1

 

- 1

 

- 1

 

- 1

 

- 1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

G

E12 A32 234

BOX

 

1

1

1

1

1

1

1

1

1

1

1

1

 

2

G

E12 A49 000

PANEL ASSEMBLY

 

1

1

1

1

1

1

1

1

1

1

1

1

Including

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No.3,4

3

G

E12 913 067

SCREW CAP

 

2

2

2

2

2

2

2

2

2

2

2

2

2 PC/SET

4

G

E12 915 010

FRONT PANEL

 

1

1

1

1

1

1

1

1

1

1

1

1

 

5

G

E12 915 100

CATECHIN AIR FILTER

 

1

1

1

1

1

1

1

1

1

1

1

1

 

(LEFT)

 

 

6

G

E12 916 100

CATECHIN AIR FILTER

 

1

1

1

1

1

1

1

1

1

1

1

1

 

(RIGHT)

 

 

7

G

AIR CLEANING

 

1

1

1

1

1

1

1

1

1

1

1

1

MAC-415FT-E

FILTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

G

E12 A32 975

CORNER BOX

 

1

1

1

1

1

1

1

1

1

1

1

1

 

(RIGHT)

 

 

9

G

E12 913 970

INSTALLATION PLATE

 

1

1

1

1

1

1

1

1

1

1

1

1

 

10

G

E12 A49 978

CONDUIT PLATE

 

1

 

1

 

1

 

1

 

1

 

1

 

 

2. ACCESSORY AND REMOTE CONTROLLER

 

G

E12 A54

426

 

 

1

 

1

 

1

 

1

 

 

 

 

 

KM06A

11

G

E12 A49

426

REMOTE

 

 

 

 

 

 

 

 

 

1

 

1

 

KM06C

G

E12 C30 426

CONTROLLER

 

 

 

 

 

 

 

 

 

 

1

 

1

KM07L

 

G

E12 C22 426

 

 

 

1

 

1

 

1

 

1

 

 

 

 

KM07J

12

G

E12 527 083

REMOTE

 

1

1

1

1

1

1

1

1

1

1

1

1

 

CONTROLLER

 

 

 

 

 

 

HOLDER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

36

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

1

19

18

17

16

15

2

3

4

5

6

 

 

12

 

 

 

 

 

11

 

 

 

 

 

10

 

 

 

12

7

8

9

13

14

No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

RoHS

Part No.

Part name

Symbol

Diagram

 

in Wiring

G

E12 751 509

BEARING MOUNT

 

G

E12 001 504

SLEEVE BEARING

 

G

E12 897 702

DRAIN HOSE

 

G

E12 A54 235

NOZZLE ASSEMBLY

 

G

E12 A56 235

 

VANE MOTOR UNIT (HORIZONTAL)

MV

G

E12 897 303

G

E12 913 040

HORIZONTAL VANE

 

G

E12 915 095

POWER MONITOR RECEIVER

 

P.C. BOARD HOLDER

 

G

E12 A49 979

CONDUIT COVER

 

G

E12 C30 979

CONDUIT COVER

 

G

E12 A49 780

TERMINAL BLOCK

 

G

E12 C30 780

COVER

 

G

E12 A49 779

TERMINAL BLOCK

 

G

E12 C30 779

HOLDER

 

G

E12 913 375

TERMINAL BLOCK

TB

G

E12 A54 452

 

 

G

E12 A55 452

ELECTRONIC

 

G

E12 A56 452

 

 

 

CONTROL P.C.

 

G

E12 A57 452

 

BOARD 1

 

G

E12 A51 452

 

 

 

G

E12 A52 452

ROOM TEMPERATURE THERMISTOR

RT11

G

E12 897 308

G

E12 A54 307

INDOOR COIL

RT12,

G

E12 A56 307

THERMISTOR

RT13

G

E12 915 782

SWITCH HOLDER

 

G

E12 A54 300

INDOOR FAN MOTOR 2

MF

G

E12 897 333

MOTOR BAND

 

G

E12 897 302

LINE FLOW FAN

 

 

 

 

 

 

Q'ty/unit

 

 

 

 

 

 

 

 

 

MSZ-A

 

 

 

 

MSY-A

 

Remarks

09NA

12NA

15NA

17NA

15NA

17NA

 

 

- 1

 

- 1

 

- 1

 

- 1

 

- 1

 

- 1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

UP & DOWN

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

 

 

 

 

 

 

 

 

1

1

1

1

1

1

1

1

1

1

1

1

 

 

 

 

 

 

 

 

 

1

 

1

 

1

 

1

 

1

 

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

RC0J30-□□

1

1

1

1

1

1

1

1

1

1

1

1

 

1

1

1

1

1

1

1

1

1

1

1

1

 

1 Including SW P.C. BOARD and POWER MONITOR RECEIVER P.C. BOARD 2 Including FAN MOTOR RUBBER MOUNT (2 PC/SET)

37

MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA 4. INDOOR UNIT HEAT EXCHANGER

1

2

3

 

RoHS

 

 

Symbol

 

 

 

 

 

Q'ty/unit

 

 

 

 

 

 

 

 

 

 

 

 

MSZ-A

 

 

 

 

MSY-A

 

 

No.

Part No.

Part name

in Wiring

 

 

 

 

 

 

 

 

Remarks

 

 

 

Diagram

09NA

12NA

15NA

17NA

15NA

17NA

 

 

 

 

 

- 1

 

- 1

 

- 1

 

- 1

 

- 1

 

- 1

 

 

 

 

 

 

 

 

 

 

 

 

 

1

G

E12 A54 620

INDOOR HEAT

 

1

1

1

1

 

 

 

 

 

 

 

 

 

G

E12 A56 620

EXCHANGER

 

 

 

 

 

1

1

1

1

1

1

1

1

 

2

G

E12 815 666

UNION (GAS)

 

1

1

1

1

 

 

 

 

 

 

 

 

ø3/8

G

E12 155 666

 

 

 

 

 

1

1

1

1

1

1

1

1

ø1/2

 

 

 

 

 

 

 

3

G

E12 151 667

UNION (LIQUID)

 

1

1

1

1

1

1

1

1

1

1

1

1

ø1/4

5.AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)

AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.

Normal life of AIR CLEANING FILTER is 1 year.

If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm water) and rinse it delicately, without removing the filter from the frame about once every 3 months.

Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.

Do not remove or attach AIR CLEANING FILTER during unit operation.

Model

Part No.

MSZ-A09/12/15/17NA MAC-415FT-E

MSY-A15/17NA

Replacement of the air cleaning filter

(1)Remove the catechin air filter (left one). The air cleaning filter is not attached to the right side catechin air filter.

(2)Remove the air cleaning filter (Blue bellows type) from the catechin air filter.

Air cleaning filter (Blue bellows type)

38

MSZ-A24NA

 

MSY-A24NA

7. INDOOR UNIT HEAT EXCHANGER

6. INDOOR UNIT STRUCTURAL PARTS

1

 

2

 

3

11

 

4

8

 

5

9

(See 10-2.10.)

 

 

12

 

13

6

 

 

7

6. INDOOR UNIT STRUCTURAL PARTS

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

No.

RoHS

Part No.

Part Name

 

1

G

E12 527 970

INSTALLATION PLATE

2

G

E12 685 234

BOX

3

G

E12 888 000

FRONT PANEL ASSEMBLY

4

G

E12 408 142

CATCH

5

G

E12 685 067

SCREW CAP

6

G

E12 888 010

GRILLE

7

G

E12 534 100

CATECHIN AIR FILTER

8

G

E12 685 975

CORNER BOX (RIGHT)

9

G

AIR CLEANING FILTER

10

G

E12 888 007

LAMP PANEL

Symbol

 

Q'ty/unit

 

 

in Wiring

MSZ-A24NA

MSY-A24NA

Remarks

Diagram

 

- 1

 

- 1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

Including No.5,6

 

4

4

4

4

4 PC/ SET

 

3

3

3

3

3 PC/ SET

 

1

1

1

1

 

 

2

2

2

2

1 PC/ SET

 

1

1

1

1

 

 

2

2

2

2

MAC-2300FT

 

1

1

1

1

 

7. INDOOR UNIT HEAT EXCHANGER

11

G

E12 A58 620

INDOOR HEAT EXCHANGER

 

1

1

1

1

 

12

G

E12 527 666

UNION (GAS)

 

1

1

1

1

ø5/8

13

G

E12 151 667

UNION (LIQUID)

 

1

1

1

1

ø1/4

39

MSZ-A24NA

 

 

 

 

MSY-A24NA

 

 

9. ACCESSORY AND

 

8. INDOOR UNIT FUNCTIONAL PARTS AND

 

ELECTRICAL PARTS

 

 

REMOTE CONTROLLER

1

18

 

17

 

2

 

 

21

22

3

 

 

 

 

4

 

9

 

 

10

 

16

 

 

 

 

 

 

5

 

 

 

 

6

12

11

15

 

 

 

8

 

 

 

 

 

 

 

7

 

 

 

 

13 14 15

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

Part numbers that are circled are not shown in the illustration.

No.

RoHS

Part No.

Part Name

 

1

G

E12 527 302

LINE FLOW FAN

2

G

E12 408 509

BEARING MOUNT

3

G

E12 001 504

SLEEVE BEARING

4

G

E12 408 702

DRAIN HOSE

5

G

E12 A58 235

NOZZLE

6

G

E12 685 040

VANE UPPER

7

G

E12 685 041

VANE LOWER

8

G

E12 527 034

VANE CRANK SET

9

G

E12 A58 300

INDOOR FAN MOTOR

ASSEMBLY 1

10

G

E12 448 303

VANE MOTOR (VERTICAL)

11

G

E12 408 303

VANE MOTOR (HORIZONTAL)

12

G

E12 918 333

MOTOR BAND

13

G

E12 918 329

DISPLAY P.C. BOARD

14

G

E12 918 468

RECEIVER P.C. BOARD

15

G

E12 A58 452

ELECTRONIC CONTROL P.C.

G

E12 A53 452

BOARD 2

16

G

E12 527 308

ROOM TEMPERATURE

THERMISTOR

17

G

E12 A58 375

TERMINAL BLOCK

18

G

E12 918 307

INDOOR COIL THERMISTOR

19G E12 528 034 VANE MOTOR SUPPORT SET (RIGHT)

20G E12 529 034 VANE MOTOR SUPPORT SET (LEFT)

1 Including FAN MOTOR RUBBER MOUNT 2 Including SW P.C. BOARD

Symbol

 

Q'ty/unit

 

 

in Wiring

MSZ-A24NA

MSY-A24NA

Remarks

Diagram

 

- 1

 

- 1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

RC0J56-□□

MF

1

1

1

1

MV2

2

2

2

2

RIGHT & LEFT

MV1

1

1

1

1

UP & DOWN

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

 

 

1

1

 

 

 

 

 

 

1

1

 

RT11

1

1

1

1

 

TB

1

1

1

1

 

RT12, RT13

1

1

1

1

 

 

1

1

1

1

 

 

1

1

1

1

 

9. ACCESSORY AND REMOTE CONTROLLER

 

G

E12 A58 426

 

 

1

 

 

 

KM06B

21

G

E12 A53 426

REMOTE CONTROLLER

 

 

 

1

 

KM06D

G

E12 C26 426

 

 

1

 

 

KM07K

 

G

E12 C29 426

 

 

 

 

 

1

KM07M

22

G

E12 527 083

REMOTE CONTROLLER HOLDER

 

1

1

1

1

 

40

10.AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)

AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.

Normal life of AIR CLEANING FILTER is 1 year.

If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm water) and rinse it delicately, without removing the filter from the frame about once every 3 months.

Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.

Do not remove or attach AIR CLEANING FILTER during unit operation.

Model

Part No.

 

 

 

 

 

MSZ-A24NA

MAC-2300FT

 

 

 

 

 

 

 

 

 

 

MSY-A24NA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Air cleaning filter

(Anti-allergy enzyme filter:blue bellows type)

41

11 MICROPROCESSOR CONTROL

MSZ-A09NA MSZ-A17NA

MSY-A15NA

MSZ-A12NA

MSZ-A24NA

MSY-A17NA

MSZ-A15NA

 

MSY-A24NA

WIRELESS REMOTE CONTROLLER

These pictures show MSZ-A24.

Signal transmitting section

(This diagram shows an overall view.)

Operation display section

ON/OFF (operate/ stop) button

VANE button

(Horizontal vane button) Temperature buttons

 

Operation select button

 

ECONO COOL button

 

WIDE VANE button

 

(Vertical vane button)

Indication of

(MSZ-A24, MSY-A24)

 

remote controller

POWERFUL button

model is on back

 

 

RESET button

NOTE

Use the remote controller provided with the unit only. Do not use other remote controller.

(This diagram shows an overall view.)

Fan speed control button

Off-timer button

On-timer button

TIME set buttons

Forward button

Backward button

CLOCK set button

Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP (ON/OFF) button ON.

Indoor unit receives the signal with a beep tone.

When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes.

INDOOR UNIT DISPLAY SECTION

Operation Indicator lamp

The operation indicator at the right side of the indoor unit indicates the operation state. •The following indication applies regardless of shape of shape of the indication.

 

 

Difference between

 

Indication

Operation state

target temperature

 

 

 

and room temperature

 

 

 

 

Lighted

 

This shows that the air conditioner is

 

Blinking

 

operating to reach the target temperature.

Approx. 4°F or more

Not lighted

 

Please wait until the target temperature is

 

 

 

 

obtained.

 

 

 

 

 

 

 

This shows that the room temperature is

Approx. 4°F or less

 

 

approaching the target temperature.

 

 

 

 

 

 

 

 

 

This shows a state of standby for operation.

 

 

(For multi system air conditioner)

 

 

 

 

 

 

 

 

42

11-1. COOL ( ) OPERATION

(1)Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

(2)Select COOL mode with OPERATION SELECT button.

(3)Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 ~ 88°F.

1.Coil frost prevention

When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.

The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger rises.

2.Low outside temperature operation

When the outside temperature lowers during cool mode operation, low outside temperature operation starts, and the outdoor fan slows or stops.

11-2. DRY ( ) OPERATION

(1) Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

(2)Select DRY mode with OPERATION SELECT button.

(3)The set temperature is determined from the initial room temperature.

1.Coil frost prevention

Coil frost prevention is as same as COOL mode. (11-1.1.)

2.Low outside temperature operation

Low outside temperature operation is as same as COOL mode. (11-1.2.)

11-3. HEAT ( ) OPERATION (MSZ)

(1)Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

(2)Select HEAT mode with OPERATION SELECT button.

(3)Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 ~ 88°F.

1.Cold air prevention control

When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.

2.High pressure protection

In HEAT operation the compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively.

3.Defrosting

Defrosting starts when the temperature of outdoor heat exchanger becomes too low. The indoor/outdoor fans stop, the 4-way valve reverses, and the compressor starts.

This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.

11-4. FAN( )OPERATION (MSY)

(1)Press OPERATE/STOP (ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.

(2)Select FAN mode with OPERATION SELECT button.

(3)Select the desired fan speed. When AUTO, it becomes Low. Only indoor fan operates. Outdoor unit does not operate.

11-5. “I FEEL CONTROL” ( ) OPERATION (MSY)

(1)Press OPERATE/STOP (ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

(2)Select “I FEEL CONTROL” mode with OPERATION SELECT button.

(3)The operation mode is determined by the room temperature at start-up of the operation.

Initial room temperature

Mode

75 °F or more

COOL mode of

"I FEEL CONTROL"

 

less than 75 °F

DRY mode of

"I FEEL CONTROL"

 

Once the mode is fixed, the mode does not change by room temperature afterwards.

Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at the set time the operation starts.

43

(4) The initial set temperature is decided by the initial room temperature.

Model

Initial room temperature

Initial set temperature

COOL mode of

79 °F or more

75°F

 

 

 

1

"I FEEL CONTROL"

77 °F to 79 °F

Initial room temperature minus 4 °F

 

 

 

 

 

 

 

DRY mode of

less than 77 °F

Initial room temperature minus 4 °F

"I FEEL CONTROL"

 

 

 

1 When the system is restarted with the remote controller, the system operates with the previous set temperature regardless of room temperature at restart.

The set temperature is calculated by the previous set temperature.

(5)TEMPERATURE buttons

In “I FEEL CONTROL” ( ) mode, set temperature is decided by the microprocessor based on the room temperature. In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm. Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.

Fuzzy control

When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.

In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.

TOO

COOL

To raise the set temperature 2~4 °F

TOO

WARM

To lower the set temperature 2~4 °F

11-6. AUTO CHANGE OVER ··· AUTO MODE OPERATION (MSZ)

Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.

Mode selection

(1)Initial mode

When unit starts the operation with AUTO operation from off;

If the room temperature is higher than the set temperature, operation starts in COOL mode.

If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.

(2)Mode change

COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 4°F below the set temperature.

HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 4°F above the set temperature.

NOTE:

If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in (AUTO), cannot change over to the other operating mode (COOL ↔ HEAT) and becomes a state of standby.

Refer to 8-1. ”INFORMATION FOR MULTI SYSTEM AIR CONDITIONER”.

44

11-7. AUTO VANE OPERATION

1.Horizontal vane

(1)Vane motor drive

These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.

(2)The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.

MSZ-A09/12/15/17

MSY-A15/17

MSZ-A24

MSY-A24

(3)Positioning

The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle. Confirming of standard position is performed in the following cases.

(a)When the operation starts or finishes (including timer operation).

(b)When the test run starts.

(c)When multi-standby starts or finishes.

(4)VANE AUTO ( ) mode

In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum room-temperature distribution.

(1) COOL and DRY operation

(2) HEAT operation (MSZ)

Vane angle is fixed to Horizontal position or Angle 1.

Vane angle is fixed to Angle 4.

Upward

(5)STOP (operation OFF) and ON-TIMER standby

In the following cases, the horizontal vane returns to the closed position.

(a)When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).

(b)When the operation is stopped by the emergency operation.

(c)When ON-TIMER is ON standby.

(6)Dew prevention

During COOL or DRY operation with the vane angle at Angle 2 ~ 4 (A09 ~ 17) / Angle 3 ~ 5 (A24) when the compressor cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.

(7)SWING MODE ( )

By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. The remote controller displays “ .

(8)Cold air prevention in HEAT operation (MSZ) The horizontal vane position is set to Upward.

NOTE : When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off, this control doesn’t work in the indoor unit.

45

(9) To change the airflow direction not to blow directly onto your body. (MSZ-A09/12/15/17, MSY-A15/17)

To change the airflow direc-

 

When to use this function?

COOL/DRY

 

HEAT

tion

 

 

(For MSZ)

 

 

 

 

Pressing and holding VANE

Use this function if you don’

The air conditioner starts

The air conditioner starts heating

CONTROL button for 2

t want the air from the indoor

the cooling or drying opera-

operation approx. 3 minutes after

seconds or more cause the

unit to blow directly onto your

tion approx. 3 minutes after

the vane has moved to the horizon-

horizontal vane to reverse

body.

the vane has moved to the

tal position.

and move to horizontal posi-

Depending on the shape of

horizontal position.

Sometimes the area around your

tion.

 

the room, the air may blow

• When VANE CONTROL

 

feet may not warm. To warm the

 

 

directly onto your body.

button is pressed again,

 

area around the feet, set the hori-

 

Press VANE CONTROL

the vane returns to the

 

zontal vane to (AUTO) or the

 

previously-set position and

 

downward-blowing position.

Horizontal

 

button again to return the

the air conditioner starts

When VANE CONTROL button is

 

vane to the previously-set

the cool or dry operation in

position

 

position.

approx. 3 minutes.

 

pressed again, the vane returns

 

 

 

 

 

to the previously-set position and

 

 

 

 

 

the air conditioner starts the heat

 

 

 

 

 

operation in approx. 3 minutes.

 

 

 

 

 

 

NOTE :

If you make the airflow not to blow directly onto your body by pressing VANE CONTROL button, the compressor stops for 3 minutes even during the operation of the air conditioner.

The air conditioner operates with Very Low speed until the compressor turns on again.

(10)ECONO COOL ( ) operation (ECONOmical operation)

When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 3.6°F higher than that in COOL mode.

Also the horizontal vane swings in various cycle.

SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved.

ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or change to other operation mode.

(11)POWERFUL ( ) operation

The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode. The POWERFUL mode is automatically released 15 minutes after operation starts, and the operation mode returns to the mode prior to POWERFUL operation.

2.Vertical vane (MSZ-A24, MSY-A24)

(1)Vane motor drive

These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12 V) transmitted from microprocessor.

(2)The vertical vane angle and mode change as follows by pressing WIDE VANE button.

12 34 SWING 5 6

(3)Positioning

The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle. Confirming of standard position is performed in the following cases.

(a)When OPERATE/STOP (ON/OFF) button is pressed (POWER ON/OFF).

(b)When SWING is started or finished.

(c)When the power supply turns ON.

(4)SWING MODE ( )

By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally. The remote controller displays “ ”.

46

(5)WIDE MODE ( )

By selecting WIDE mode with WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the

remote controller (). The remote controller displays “ ”.

NOTE : The position of vane angle 3, angle 4 and angle 5 are different in COOL operation and HEAT operation.

Indoor fan speed becomes faster than setting fan speed on the remote controller even when or is selected.

11-8. TIMER OPERATION

1.How to set the time

(1)Press OPERATE/STOP (ON/OFF) button to start the air conditioner.

(2)Check that the current time is set correctly.

NOTE : Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button.

How to set the current time

(1)Press the CLOCK set button.

(2)Press the TIME SET buttons ( and ) to set the current time.

Each time FORWARD button ( ) is press, the set time increases by 1 minute, and each time BACKWARD button ( ) is press, the set time decreases by 1 minute.

Pressing those buttons longer increases / decreases the set time by 10 minutes. Press the CLOCK set button.

ON timer setting

(1)Press ON-TIMER button( ) during operation.

(2)Set the time of the timer using TIME SET buttons ( and ) .

OFF timer setting

(1)Press OFF-TIMER button ( ) during operation.

(2)Set the time of the timer using TIME SET buttons ( and ).

Each time FORWARD button ( ) is pressed, the set time increases by 10 minutes; each time BACKWARD button ( ) is pressed, the set time decreases by 10 minutes.

2. Cancel

To cancel ON timer, press ON-TIMER button ( ). To cancel OFF timer, press OFF-TIMER button( ).

TIMER is cancelled and the display of set time disappears.

PROGRAM TIMER

OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first.

” and “ ” display shows the order of OFF timer and ON timer operation.

(Example 1) The current time is 8:00 PM.

The unit turns off at 11:00 PM, and on at 6:00 AM.

(Example 2) The current time is 11:00 AM.

The unit turns on at 5:00 PM, and off at 9:00 PM.

NOTE : If the main power is turned off or a power failure occurs while AUTO START/STOP timer is active, the timer setting is cancelled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer cancelled when power is restored.

47

11-9. EMERGENCY/TEST OPERATION

In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down. The unit will start and OPERATION INDICATOR lamp will light.

The first 30 minutes of operation is the test run operation. This operation is for servicing. The Indoor fan speed runs at High speed and the system is in continuous operation (with thermostat ON).

After 30 minutes of test run operation the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of 75°F. The fan speed shifts to Med.

All protective operations such as the coil frost prevention works even in emergency operation.

In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode.

Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller. In case of latter normal operation will start.

NOTE : Do not press EMERGENCY OPERATION switch during normal operation.

E.O.

SW

EMERGENCY OPERATION switch

Operation mode

COOL

HEAT (MSZ)

Set temperature

75°F

75°F

Fan speed

Med.

Med.

 

 

 

Horizontal vane

Auto

Auto

 

 

 

The operation mode is indicated by the Operation Indicator lamp as following

MSZ type

EMERGENCY

COOL

 

Lighted

 

 

Not lighted

EMERGENCY

 

 

 

HEAT

 

 

STOP

MSY type

EMERGENCY COOL

STOP

11-10. Changing temperature indication (°F/°C)

MSZ-A•NA- MSY-A•NA-

1

1

The preset unit is °F. Press RESET button while the temperature buttons are pressed.

Press RESET button gently using a thin stick.

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

Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jun. 2008. No. OB450 REVISED EDITION-C 6 Distributed in May 2007. No. OB450 REVISED EDITION-B 7 Distributed in Dec. 2006. No. OB450 REVISED EDITION-A 7 Distributed in Apr. 2006. No. OB450 7

Made in Japan

New publication, effective Jun. 2008 Specifications subject to change without notice.