Logitech MSZ-A09NA, EDITION-B User Manual

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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

+ 33 hidden pages