Mitsubishi Electronics MSY-A15NA, MSZ-A15NA, MSZ-A09NA, MSY-A17NA, MSZ-A17NA User Manual

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Page 1

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Revision B:

• MSZ-A•NA- and MSY-A•NA- have been added.

Please void OB450 REVISED EDITION-A.

INDOOR UNIT

No. OB450

SERVICE MANUAL

REVISED EDITION-B

Wireless type Models

MSZ-A09NA MSZ-A24NA MSZ-A09NA - MSZ-A24NA -

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

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

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

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

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

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).

Page 2

Remote controller

KM06A

KM07J KM06B KM07K KM06C KM07L KM06D

KM07M

Temperature indication

_F/ _C

MSZ-A09/12/15/17NA MSZ-A09/12/15/17NAMSZ-A24NA MSZ-A24NAMSY-A15/17NA MSY-A15/17NAMSY-A24NA MSY-A24NA-

Models

Revision A :

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

Revision B :

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

TECHNICAL CHANGES

MSZ09UN ➔ MSZ-A09NA MSZ12UN ➔ MSZ-A12NA MSH15TN ➔ MSZ-A15NA MSH17TN ➔ MSZ-A17NA

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- MSZ-A12NA➔MSZ-A12NA- MSZ-A15NA➔MSZ-A15NA- MSZ-A17NA➔MSZ-A17NA-

MSH24WN ➔ MSZ-A24NA MS15TN ➔ MSY-A15NA MS17TN ➔ MSY-A17NA MS24WN ➔ MSY-A24NA

MSZ-A24NA➔MSZ-A24NA

MSY-A15NA➔MSY-A15NA-

MSY-A17NA➔MSY-A17NA-

MSY-A24NA➔MSY-A24NA-

1.Remote controller has been changed.

• Temperature indication function (_F/_C) has been added. (Refer to 11-10.)

• 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)

Page 3

Line flow fan

Air outlet Vertical vane

Air inlet

Display section

Front panel

Panel

Heat exchanger

Horizontal vane

Operation section

(When the front panel is opened)

Remote controller

Remote control receiving section

Catechin air filter

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

Emergency operation switch

Operation indicator lamp

Remote control

receiving section

Operation Indicator lamp

1 2 3 4 5 6 7 8

Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 o 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) Conduit plate

1 7 1 2 2 1 1

–

1 8 1 2 2 1 1 1

MSZ-A24NA MSY-A24NA

MSZ-A09/12/15/17NA

MSY-A15/17NA

1 5 1 2 2 1 1

–

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

MSY-A15/17NA- 1

PART NAMES AND FUNCTIONS

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

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

MSZ-A24NA MSY-A24NA

ACCESSORIES

Page 4

Item

Model

MSZ-A12NA

Indoor unit model External finish Power supply Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor

Airflow Low—Med.—High Moisture removal

Sound level Low-Med.-High Cond. drain connection O.D.

Dimensions Weight

Remote controller Control voltage (by built-in transformer)

V, phase, Hz

A A

F.L.A

CFM CFM

pt./h

dB(A)

in. in. in. in. Ib.

MSZ-A12NA

1.0

0.76

353-240-159

353(318)-240(215)-152(134)

3.2

22-34-42

MSZ-A09NA

1.0

0.76

307-222-159

307(275)-229(205)-152(134)

2.3

22-33-38

White

208/230, 1, 60

5/8

30-11/16

8-1/4

11-3/4

Wireless type

12-24V DC

MSZ-A09NA

HEAT Dry COOL Dry (Wet)

W D H

Item

Model

MSZ-A17NA MSY-A17NA

Indoor unit model External finish Power supply Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor

Airflow Low—Med.—High Moisture removal

Sound level Low-Med.-High Cond. drain connection O.D.

Dimensions Weight

Remote controller Control voltage (by built-in transformer)

V, phase, Hz

A A

F.L.A

CFM CFM

pt./h

dB(A)

in. in. in. in. Ib.

1.0

0.76

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

5.1

1.0

0.76

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

4.7

381-314-254

34-40-45/34-38-44—34-40-45/ —

381-314-254

34-40-46/34-38-44—34-40-46/ —

White

208/230, 1, 60

5/8

30-11/16

8-1/4

11-3/4

Wireless type

12-24V DC

MSZ-A15NA MSY-A15NA

HEAT Dry COOL Dry (Wet)

W D H

HEAT Dry COOL Dry (Wet)

W D H

Item

Model

MSY-A24NA

Indoor unit model External finish Power supply Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor

Airflow Low—Med.—High Moisture removal

Sound level Low-Med.-High Cond. drain connection O.D.

Dimensions Weight

Remote controller Control voltage (by built-in transformer)

V, phase, Hz

A A

F.L.A

CFM CFM

pt./h

dB(A)

in. in. in. in. Ib.

MSY-A24NA

1.0

0.76

—

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

7.3

34-40-49/ —

MSZ-A24NA

1.0

0.76

568-486-296

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

7.3

34-40-49/34-40-48

White

208/230, 1, 60

5/8

43-5/16

10-1/4

12-13/16

Wireless type

12-24V DC

MSZ-A24NA

(Cooling/Heating)

MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA

SPECIFICATION

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 : 17˚FDB, 15˚FWB

(heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB

Page 5

3-1. OPERATING RANGE

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

Rated voltage Guaranteed VoltageModel

Min. 198V Max. 253V

208V

230V

208/230V 1phase 60Hz

78%

—

Function

Cooling

Heating

Standard temperature

Maximum temperature

Minimum temperature

Maximum humidity

Standard temperature

Maximum temperature

Minimum temperature

DB (˚F)

80 95 67

70 80 70

WB (˚F)

67 71 57

60 67 60

Indoor

DB (˚F)

115

47 75 14

WB (˚F)

— — —

43 65 13

Outdoor

Condition

Intake air temperature

(1) POWER SUPPLY

(2) OPERATION

3-2. OUTLET AIR SPEED AND COVERAGE RANGE

Model

MSZ-A09NA

MSZ-A12NA

MSZ-A15NA MSZ-A15NA MSY-A15NA MSZ-A17NA MSZ-A17NA MSY-A17NA MSZ-A24NA MSZ-A24NA MSY-A24NA

Mode

HEAT COOL

HEAT COOL HEAT COOL HEAT COOL HEAT COOL

Function

Dry Dry

Wet

Dry Dry

Wet

Dry Dry

Wet

Dry Dry

Wet

Dry Dry

Wet

Air flow

(CFM)

Air speed

(ft./sec.)

307 307 275 353 353 318 381 381 342 381 381 342 568 568 508

16.8

15.1

19.3

17.4

20.9

18.8

20.9

18.8

20.2

18.1

Coverage range (ft.)

23.4

21.0

26.7

24.1

28.8

26.0

28.8

26.0

34.4

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.

Page 6

11-3/4

424-9/16

30-11/16

8-1/4

3/16

2-1/8

3/4

6-1/4

2-5/16

Air in

Air out

Installation plate

Insulation [1-1/8

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

Liquid line [1/4 19-11/16 Gas line [3/8 16-15/16 Insulation [1-3/8 O.D [3/4 I.D

{

6-1/8 6-1/8

7/8

1-3/4

13-3/16 12-5/8

1-5/8 8-7/16

10-1/8

1-11/16

8-7/16

1/8

11-5/16

2-3/4

2-3/16

2-3/16 2-3/16

8-7/8 8-7/8

9/1610-3/4

9-3/16

Wall hole [2-9/16

Indoor unit

Installation plate

7/16x13/16

Oblong hole

7/16x1 Oblong hole

7/8

hole

Conduit plate(MSZ-A•NA- and MSY-A•NA- are excluded.)

OUTLINES AND DIMENSIONS

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

Unit : inch

Page 7

MSZ-A24NA MSY-A24NA

Unit : inch

12-13/16

2-3/16

2-5/16

42-1/16

43-5/16

31-1/8

3/4

9-15/16

Installation plate

3-7/8

1-7/8

3-7/8 6-13/16

Air in

16-5/16 16-5/16

Wall hole [3

10-1/4

Air out

3/16

Installation plate

Indoor unit

Liquid line [1/4 19-11/16 Gas line [5/8 16-15/16

{

Insulation [1-15/16 O.D

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

Insulation [1-1/8

6-13/16

[1-1/4 I.D

1/8

10-1/161-7/8

5/16

12-3/8

6-1/4

Wireless remote controller

Page 8

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

WIRING DIAGRAM

MSZ-A24NA MSY-A24NA

Page 9

Indoor heat exchanger

Flared connection

Room temperature thermistor RT11

Indoor coil thermistor RT13(sub)

Flared connection

Refrigerant pipe [3/8 (with heat insulator)

Refrigerant pipe [1/4 (with heat insulator)

Indoor coil thermistor RT12(main)

REFRIGERANT SYSTEM DIAGRAM

MSZ-A09NA MSZ-A12NA

MSZ-A15NA MSY-A15NA MSZ-A17NA MSY-A17NA

Refrigerant pipe [1/2 (with heat insulator)

Indoor heat exchanger

Room temperature thermistor RT11

Indoor coil thermistor RT12(main)

Distributor

Flared connection

Indoor coil thermistor RT13(sub)

Flared connection

Unit:inch

MSZ-A24NA MSY-A24NA

Indoor heat exchanger

Room temperature thermistor RT11

Indoor coil thermistor RT12(main)

Distributor

Indoor coil thermistor RT13(sub)

Refrigerant pipe[1/4 (with heat insulator)

Refrigerant pipe [5/8 (with heat insulator)

Flared connection

Refrigerant pipe [1/4 (with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

Page 10

No. 1 unit No. 2 unit No. 3 unit No. 4 unit

1 unit operation No modification

– – –

2 units operation

Same as at left

Solder J1

– –

3 units operation

Same as at left Same as at left

Solder J2

–

4 units operation

Same as at left Same as at left Same as at left

Solder both J1 and J2

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, 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

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.

Page 11

JR07

CN151 CN211CN112

7-3. AUTO RESTART FUNCTION

JR07

CN151

CN152

CN101

CN211CN112

Housing point

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

1 If the main power has been cut, the operation settings remain. 2 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”

1Turn off the main power of the unit. 2Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 8-7.)

MSZ-A09/12/15/17NA MSY-A15/17NA

MSZ-A24NA MSY-A24NA

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.

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 mis-wiring.

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

Page 12

3. Troubleshooting procedure

RESET button

Insert the negative pole of the batteries first. Check if the polarity of the batteries is correct.

OPERATION INDICATOR

Not lighted

Blinking

Lighted

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.

1 Remove the front lid and insert batteries.

Then reattach the front lid.

2 Press RESET button with tip end of ball point pen

or the like, and then use the remote controller.

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.

•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.

Page 13

8-2. Failure mode recall function

Operational procedure

Yes

(Blinks)

(OFF)

Yes

Releasing the failure mode recall function

Note1.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.

W2. Blinking pattern when the indoor unit is abnormal:

W3.Blinking pattern when the outdoor unit is abnormal:

OFF

Beeps

Repeated cycle Repeated cycle

OFF

No beep Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5-

second interval

Repeated cycle

Beeps

Does the left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. W2

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

Setting up the failure mode recall function

Before blinking, does the left lamp of OPERATION INDICATOR lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal.

The indoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table(8-2.2.). Make sure to check at least two consecutive blinking cycles. W2

Turn ON the power supply. <

Preparation of the remote controller

1 While pressing both OPERATION SELECT

button and TOO COOL button on the remote controller at the same time, press RESET button.

2 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.

Deleting the memorized abnormal condition

1After repairing the unit, recall the failure mode again according to

"Setting up the failure mode recall function" mentioned above.

2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)

with the remote controller headed towards the indoor unit.

3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function"

mentioned above.

Repair the defective parts.

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.

Judgment of indoor/outdoor abnormality

Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities 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 outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to outdoor unit service manual.) Make sure to check at least two consecutive blinking cycles. W3

W1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

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

Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (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

Page 14

2. Indoor unit failure mode table

12-time flash

2.5-second OFF

Replace the indoor electronic control P.C. board.

Indoor control system

It cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.

11-time flash

2.5-second OFF

Refer to 8-6.A "Check of indoor fan motor".

Indoor fan motor

The rotational frequency feedback signal is not emit during the 12 seconds the indoor fan operation.

2-time flash

2.5-second OFF

Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (8-7.).

Indoor coil thermistor

The indoor coil thermistor short or open circuit is detected every 8 seconds during operation.

3-time flash

2.5-second OFF

Refer to 8-6.D "How to check mis-wiring and serial signal error".

Serial signal

The serial signal from outdoor unit is not received for a maximum of 6 minutes.

1-time flash every 0.5-second

Refer to the characteristics of the room temperature thermistor (8-7.).

Room temperature thermistor

The room temperature thermistor short or open circuit is detected every 8 seconds during operation.

Not lighted –Normal –

Left lamp of OPERATION

INDICATOR lamp

Correspondence

Abnormal point (Failure mode)

Condition

NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (8-4.).

Page 15

8-3. Instruction of troubleshooting

Start

Indoor unit operates. Outdoor unit doesn't operate.

Outdoor unit operates only in Test Run operation.

Check room temperature thermistor. Refer to 8-7. "Test point diagram and voltage".

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

Refer to "How to check inverter/ compressor".

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

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

Refer to "Check of R.V. coil".

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

Indoor unit operates, when EMERGENCY OPERATION switch is pressed.

Refer to 8-6.B "Check of remote controller and receiver P.C. board".

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

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

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

2. Refer to 8-6.C "Check of indoor electronic control P.C. board and indoor fan motor".

If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function.

"Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed.

Refer to outdoor unit service manual.

Left lamp Flash on and off at 0.5-second intervals Cause: Indoor/ Outdoor unit

• Mis-wiring or trouble of serial signal

Refer to 8-6. D "How to check of mis-wiring and serial signal error

Left

lamp 2-time flash Cause: Indoor unit

• Trouble of room temp erature/ indoor coil thermistor

Check room temperature thermistor and indoor coil thermistor. Refer to 8-7. "Test point diagram and voltage".

Left

lamp 3-time flash Cause: Indoor unit

• Trouble of indoor fan motor

Refer to 8-6. A "Check of indoor fan motor".

Left lamp 4-time flash Cause: Indoor unit

• Trouble of indoor unit control system

Replace the indoor electronic control P.C. board.

Left lamp 5-time flash Cause: Outdoor unit

• Outdoor power system abnormality

Refer to "How to check inverter/ compressor".

Left lamp 6-time flash Cause: Outdoor unit

• Trouble of thermistor in outdoor unit

Refer to "Check of outdoor thermistors".

Left lamp 7-time flash Cause: Outdoor unit

• Trouble of outdoor control system

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

Left lamp 14-time flash Cause: Outdoor unit

• Other abnormality

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

Page 16

No.

SymptomOperation indicator lamp

Condition

Correspondence

Left lamp flashes.

0.5-second ON

0.5-second OFF

Mis-Wiring or serial signal

Outdoor power system

Outdoor thermistors

Outdoor control system

Indoor coil thermistor

The serial signal from the outdoor unit is not received for a maximum of 6 minutes.

It consecutively occurs 3 times that the compressor stops for overcurrent protection or start-up failure protection within 1 minute after start-up.

The outdoor thermistors short or open circuit during the compressor operation.

It cannot properly read data in the nonvolatile memory of the inverter P.C. board or the outdoor electronic control P.C. board.

• Refer to "Check of outdoor thermistor".

Refer to outdoor unit service manual.

• Refer to "How to check of inverter/ compressor".

Refer to outdoor unit service manual.

• Check the stop valve.

• Replace the inverter P.C.

board or the outdoor electronic control P.C. board. Refer to outdoor unit service manual.

• Refer to 8-6.D "How to check

mis-wiring and serial signal

error".

Indoor fan motor

Abnormal

point

Room temperature thermistor

Left lamp flashes. 2-time flash

2.5-second OFF

The indoor coil or the room temperature thermistor is short or open circuit.

• Refer to 8-7.the characteristics of indoor coil thermistor, and the room temperature thermistor.

Left lamp flashes. 3-time flash

2.5-second OFF

The rotational frequency feedback signal is not emitted during the indoor fan operation.

• Refer to 8-6.A "Check of

indoor fan motor".

Indoor unit and outdoor unit do not operate.

Left lamp flashes. 5-time flash

2.5-second OFF Left lamp flashes.

6-time flash

2.5-second OFF

Indoor unit and outdoor unit do not operate.

Other abnormality

An abnormality other than above mentioned is detected.

• Confirm the abnormality in detail using the failure mode recall function for outdoor unit.

Indoor unit and outdoor unit do not operate.

Left lamp flashes. 4-time flash

2.5-second OFF

Indoor control system

It cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board.

Indoor unit and outdoor unit do not operate.

• Replace the indoor electronic control P.C. board.

Outdoor control system

It cannot properly read data in the nonvolatile memory of the inverter P.C. board or the outdoor electronic control P.C. board.

• Check the blinking pattern of the LED on the inverter P.C. board or the outdoor electronic control P.C. board.

Outdoor unit does not operate.

Left lamp lights up

MSZ-A09/12 MSZ-A15/17 MSY-A15/17

Left lamp flashes. 7-time flash

2.5-second OFF

Left lamp flashes. 14-time flash

2.5-second OFF

8-4. Troubleshooting check table

Not lighted

Blinking

OPERATION INDICATOR

Lighted

Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing.

· Flashing of OPERATION INDICATOR lamp (left-hand side lamp) indicates abnormalities.

Page 17

OPERATION INDICATOR

Part name FigureCheck method and criterion

Indoor fan motor(MF)

Measure the resistance with a tester. Refer to 8-7. "Test point diagram and voltage",

"Indoor electronic control P.C. board", the chart of thermistor.

Room temperature thermistor(RT11)

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

Horizontal vane motor(MV)

MSZ-A09/12/15/17NA MSY-A15/17NA

Normal

BRN-other one

Measure the resistance between the terminals with a tester. (Part temperature 50°F ~ 86°F)

235 " ~ 255 "

Color of the lead wire

Check 8-6. A.

Horizontal vane motor(MV1) Vertical vane motor(MV2)

MSZ-A24NA MSY-A24NA

Normal

BRN-other one

Measure the resistance between the terminals with a tester. (Part temperature 50°F ~ 86°F)

282 " ~ 306 "

Color of the lead wire

RED

YLW BRN

ORN

GRN

ROTOR

RED

YLW BRN

ORN

GRN

ROTOR

Abnormal

No.

point

MXZ type

Operation

mode setting

Right lamp flash

2.5-second OFF

Lighted Blinking

Not lighted

· Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates abnormality.

· OPERATION INDICATOR lamp (left-hand side lamp) is lighted.

SymptomOperation indicator lamp

Outdoor unit operates but indoor unit does not operate.

8-5. Trouble criterion of main parts

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

Condition

The operation mode of the each indoor unit is differently set to COOL(includes DRY) and HEAT at the same time, the operation mode of the indoor unit that has operated at first has the priority.

Correspondence

• Unify the operation mode. Refer to outdoor unit service manual.

Page 18

w If more than 12 seconds or more passes after EMERGENCY OPERATION

switch is pressed, the voltage mentioned above 2 goes 0V DC although the indoor electric control P.C. board is normal.

Indoor electronic control P.C. board

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

Yes

No (Changed)

Yes (Unchanged)

Is there any foreign matter that interferes the rotation of the line flow fan?

Turn OFF the power supply.

Remove the foreign matter and adjust the line flow fan.

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 EMERGENCY OPERATION switch is pressed. If more than 12 seconds passes by, turn OFF the power supply and turn ON it again, then measure the voltage. w

1.Measure the voltage between CN211 1(+) and 3(-).

2.Measure the voltage between CN211 5(+) and 3(-).

Is there 294/325V DC between CN211 1 (+) and 3 (-), and does the voltage between CN211 5(+) and 3(-) rise to the range of 3 to 6V DC within 12 seconds after EMERGENCY OPERATION switch is pressed?

Yes

Replace the indoor fan motor.

CN211

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" 3times, and then stops.

Measure the voltage between CN211 6(+) and 3(-) while the fan motor is rotating.

Is it unchanged holding 0V DC or 15V DC?

Replace the indoor fan motor.

Replace the indoor electronic control P.C. board.

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

8-6. Troubleshooting flow

When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate.

Check of indoor fan motor

Page 19

Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.

Check of remote controller and receiver P.C. board

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

Switch 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

No (not clear)

MSZ-A24NA MSY-A24NA

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

Turn ON a radio to AM and press switch ON the remote controller.

Is noise heard from radio?

Yes

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

MSZ-A09/12/15/17NA MSY-A15/17NA

Yes

Replace the remote controller.

● Reinstall the unit away from lights.

● Attach a filter on receiving part.

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. 4V DC?

No (5V or 0V DC)

Replace the receiver P.C. board.

Yes

Replace the indoor electronic control P.C. board.

Page 20

The unit does not operate with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.

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.

Yes

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

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

OPERATION switch?

Measure the resistance between CN211 3 and 4 of the indoor fan motor connector.

Measure the resistance of the horizontal vane motor coil. Refer to 8-5.

Replace the indoor electronic control P.C. board.

Yes

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

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

Is the fuse(F11) blown only?

Yes

Measure the resistance between 1(+) and 3(-) of the indoor fan motor connector (to CN211 on the indoor electronic control P.C. board) . w1,w2

w1. The fan motor connector's 1 lead wire is red, whereas 3 is black. w2. Connect "+" of the tester to fan motor connector's 1 lead

wire, and "-" to 3 lead wire, otherwise the resistance cannot be measured properly.

Short/open circuit: Replace the indoor fan motor.

Short/open circuit: Replace the horizontal vane motor and the indoor electronic control P.C. board.

Indoor electronic control P.C.Board

Measure the resistance of cement resistor R111 on the indoor electronic control P.C. board.

Varistor(NR11) Fuse(F11) CN211

Is the resistance 1M" or more?

Yes

Replace the indoor electronic control P.C. board

Is the resistance approx. 4"?

Replace the indoor electronic control P.C. board.

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

Yes

Page 21

• When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate.

• When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate.

How to check mis-wiring and serial signal error

Turn OFF the power supply.

· Turn OFF inverter-controlled lighting equipment.

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

· Press EMERGENCY OPERATION switch.

Is serial signal error indicated 6 minutes later?

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

· Attach a filter on remote control receiving

Yes

section of the indoor unit.

Is there rated voltage AC in the power supply?

Yes

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and S2?

Press EMERGENCY OPERATION switch once.

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

Is serial signal error indicated 6 minutes later?

Turn OFF the power supply. Check once more if the indoor/outdoor connecting wire is not mis-wiring.

Short-circuit outdoor terminal block S2 and S3. W1

Turn ON the power supply.

Does the LED on the inverter P.C. board or the outdoor electronic control P.C.board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"?

Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20V DC between outdoor terminal block S2 and S3? <Confirmation of serial signal>

Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage>

Replace the indoor electronic control P.C. board.

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

Refer to outdoor unit service manual.

Yes

Check the power supply.

Check the wiring.

Is there any mis-wiring, poor contact, or wire

disconnection of the indoor/outdoor connecting wire?

W1. Mis-wiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. W3.Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C.board or the outdoor electronic control P.C.board is normal, LED blinks 6 times after 3 minutes. (Except for outdoor unit of multi system type)

(Lighted or not lighted)

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

W2 Be careful to the residual

voltage of smoothing capacitor.

Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block?

Yes

Correct them.

Replace the indoor/outdoor connecting wire.

Page 22

Electromagnetic noise enters into TV sets or radios

Replace or repair the antenna. Replace or repair the coaxial cable.

Yes

Is the distance between the antennas and the indoor unit within 9.91ft., or is the distance between the antennas and the outdoor unit within 9.91ft.?

Is the distance between the TV sets or radios and the indoor unit within 3.28ft., or is the distance between the TV sets or radios and the outdoor unit within 9.91ft.?

Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the antenna wiring?

Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close?

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.

Is the unit grounded?

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.

Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas.

Page 23

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 supply input

208/230V AC Fuse(F11)

}

250V 3.15A

Indoor fan motor (CN211)

1294/325V DC 3(-) Fiducial terminal of

cathode side on measuring high-voltage DC

415

V DC

5(+)3-6V DC 6(+)0V DC or 15V DC

Power monitor receiver P.C. board

Emergency operation switch

SW P.C. board

12V DC

5V DC

Indoor coil thermistor RT12(MAIN) 12 RT13(SUB) 34

(CN112) Horizontal vane

motor(CN151) Room temperature

thermistor(RT11)

Timer short mode point JPG, JPS

}

(Refer to 7-1.)

Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)] Room temperature thermistor (RT11)

Resistance (k")

Temperature (˚F)

Page 24

Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)] Room temperature thermistor (RT11)

Temperature (F˚)

Resistance (k")

MSZ-A24NA MSY-24NA

Indoor electronic control P.C. board

Release of Auto restart function Solder the Jumper wire to JR07 (Refer to 6-3.)

Display P.C. board

Cement resistor (R111)

Varistor (NR11)

Power supply input

208/230V AC Fuse(F11)

}

250V 3.15A

Indoor fan motor (CN211)

1294/325V DC 3(-) Fiducial terminal of

cathode side on measuring high-voltage DC

415

V DC

5(+)3-6V DC

6(+)0V DC or 15V DC

5V DC

Receiver P.C. board

SW P.C. board

12V DC

Indoor coil thermistor RT12(MAIN) RT13(SUB)

Horizontal vane motor(CN151)

Room temperature thermistor(RT11)

}

Vertical vane motor (CN152)

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

Page 25

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

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

1Slide the sleeve. 2Pull the terminal while

pushing the locking lever.

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

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.

<"Terminal with locking mechanism" Detaching points>

Connector

Sleeve

Locking lever

DISASSEMBLY INSTRUCTIONS

9-1. MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA

OPERATING PROCEDURE

1. Removing the panel

(1) Remove the horizontal vane. (2) Remove the screw caps of the panel.

Remove the screws. (See 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

Screw of the conduit cover

Terminal block cover

Conduit cover

PHOTOS

Photo 1

Screws of the panel

Horizontal vane

Photo 2

MSZ-A09/12/15/17NA MSY-A15/17NA -

MSZ-A09/12/15/17NA MSY-A15/17NA

Terminal block cover

Conduit cover

Screw of the conduit cover

Conduit plate

Page 26

OPERATING PROCEDURE PHOTOS

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

(See Photo 2. or Photo 3.)

(3) Remove the indoor/outdoor connecting wire. (4) Remove the switch holder from the electrical cover.

(See Photo 4.)

(5) Remove the screw of the electrical cover, and then the

electrical cover. (See Photo 4.)

(6) Remove the ground wire connected to the indoor

electronic control P.C. board from the electrical box.

(See Photo 5.)

(7) Unhook the power monitor receiver P.C. board holder from

the catch. (See Photo 4.)

(8) Open the rear cover of the power monitor receiver P.C.

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

board. (9) Open the switch holder and pull out SW P.C. board. (10) Pull the electronic control P.C. board slightly toward you

from the electrical box, and disconnect TAB3 and all the

connectors on the electronic control P.C. board.

(LD101 and LD105 are direct-mounted to the electronic

control P.C. board.)

(11)

Pull out the electronic control P.C. board from the electrical

box. (12)

Remove the ground wire connected to the heat exchanger

from the electrical box. (See Photo 5.) (13)

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

electrical box. (14)

Remove the screw of the terminal block cover, and then

remove the terminal block cover and the terminal block holder. (See Photo 6)

(15)

Remove the terminal block by sliding it.

Photo 4

Switch holder

Screw of the electrical cover.

Power monitor receiver P.C. board holder

Photo 5

Ground wire

Indoor fan motor connector (CN211)

Indoor coil thermistor connector (CN112)

Vane motor connector (CN151)

3. Removing the electrical box

(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. (See Photo 2. or

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

(See Photo 4.)

(4) Remove the ground wire connected to the heat exchanger

from the electrical box. (See 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>. (See Photo 5.)

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

electrical box.

Photo 3.

)

Photo 6

Screw

Page 27

OPERATING PROCEDURE PHOTOS

4. Removing the horizontal vane motor unit

(1) Remove the horizontal vane and the panel. (Refer to 1.) (2) Remove the screws of the horizontal vane motor unit,

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

(3) Disconnect the connector from the horizontal vane motor

unit.

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

(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

remove the nozzle assembly. (4) Remove the screws fixing the motor bed. (5) Loosen the screw fixing the line flow fan. (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

exchanger. (9) Lift the heat exchanger, and pull out the line flow fan to the

lower-left.

the drain hose from the nozzle assembly, and

(See Photo 8.)

(See Photo 9.)

(See Photo 10.)

Photo 7

Photo 8

Screws of the motor bed

Photo 9

Screws of the horizontal vane motor unit

Motor band

Screw of the line flow fan

Photo 10

Screws of the left side of the heat exchanger

Page 28

9-2.MSZ-A24NA MSY-A24NA

OPERATING PROCEDURE PHOTOS

1. Removing the front panel

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

Remove the screws.

(2) Pull the panel down to your side slightly and unhook the

catches at the top.

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

(1) Remove the front panel. (Refer to 1.) (2) Remove the corner box (3) Remove the screw of the electrical cover.

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

(4) Remove the screw of the ground wire, which is solder-

mounted to the electronic control P.C. board. (5) Remove the R.L holder. (6) Remove the screw of the conduit 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. (9) Remove the electronic control P.C. board. (10) Open the R.L holder, remove the receiver P.C. board and

the display P.C. board.

Photo 1

Photo 2

Front panel

Screws

Screw of the ground wire

Corner box

Indoor

electronic control P.C. board

T.B. SW cover

Screw of T.B. SW cover

Screw of the electrical cover

3. Removing the electrical box

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

electronic 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.

(8) Remove the screw fixing the electrical box and remove the

electrical box.

Photo 3

R.L holder

Screw of conduit cover

Screw of the ground wire

Conduit cover

Receiver P.C. board

Screw of the electrical box

Page 29

OPERATING PROCEDURE PHOTOS

4. Removing the vane motor

(1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the lead wire of vane motor.(Refer to 3.) (4) Remove the R.L. holder. (5) Pull out the drain hose from the nozzle assembly and

remove 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

(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. (5) Slide the hole cover and remove the hole cover. (6) Remove the hexagon socket set screw from the line flow

fan. (7) Remove the screws fixing the motor bed and remove the

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

is heavy.) (8) Remove the screws fixing the left side of the heat

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

) Remove the line flow fan.

Photo 4

Vane motors

Photo 6

Screws fixing the left side of the heat exchanger

Photo 7

Screws of the vane motor

Photo 8

Hole cover

Water cut

Screws of the motor bed

Page 30

10 PARTS LIST

No.

Part No.

Part name

Remarks

Symbol

in Wiring

Diagram

Q'ty/unit

1 2 3 4 5 6 7 8 9

MSZ- MSY-

11 12

REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER HOLDER

KM06A KM06C

BOX PANEL ASSEMBLY SCREW CAP FRONT PANEL CATECHIN AIR FILTER (LEFT) CATECHIN AIR FILTER (RIGHT) AIR CLEANING FILTER CORNER BOX (RIGHT) INSTALLATION PLATE CONDUIT PLATE

Including No.3,4 2PCS/SET

MAC-415FT-E

E02 A32 234 E02 A49 000 E02 913 067 E02 915 010 E02 915 100 E02 916 100

E02 A32 975 E02 913 970 E02 A49 978

1 1

E02 A54 426 E02 A49 426 E02 527 083

1 1 2 1 1 1 1 1 1 1

A09NA A12NA A15NA A17NA A15NA A17NA

10-1. PARTS LIST (non-RoHS compliant) MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA

1. INDOOR UNIT STRUCTURAL PARTS

2. ACCESSORY AND REMOTE

CONTROLLER

1. INDOOR UNIT STRUCTURAL PARTS

7 (See 10-5.)

2. ACCESSORY AND REMOTE CONTROLLER

Page 31

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

BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE ASSEMBL Y NOZZLE ASSEMBL Y VANE MOTOR UNIT (HORIZONTAL) HORIZONTAL VANE POWER MONITOR RECEIVER P.C. BOARD HOLDER CONDUIT COVER TERMINAL BLOCK COVER TERMINAL BLOCK HOLDER TERMINAL BLOCK ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR INDOOR COIL THERMISTOR SWITCH HOLDER INDOOR FAN MOTOR W2 MOTOR BAND LINE FLOW FAN

UP & DOWN

AUTO RESTART AUTO RESTART AUTO RESTART AUTO RESTART AUTO RESTART AUTO RESTART

RC0J30-

RT11 RT12, RT13 RT12, RT13

No. Part No.

Part name

Remarks

Symbol

in Wiring

Diagram

Q'ty/unit

1 2 3

4 5

6 7 8

9 10 11

13 14 15

16 17 18

E02 751 509 E02 001 504 E02 897 702 E02 A54 235 E02 A56 235 E02 897 303 E02 913 040 E02 915 095 E02 A49 979 E02 A49 780 E02 A49 779 E02 913 375 E02 A54 452 E02 A55 452 E02 A56 452 E02 A57 452 E02 A51 452 E02 A52 452 E02 897 308 E02 A54 307 E02 A56 307 E02 915 782 E02 A54 300 E02 897 333 E02 897 302

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

W1 Including SW P.C. BOARD and POWER MONITOR RECEIVER P.C. BOARD W2 Including FAN MOTOR RUBBER MOUNT (2 PCS/SET)

MSZ- MSY-

A09NA A12NA A15NA A17NA A15NA A17NA

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

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

3 4

Page 32

2 3

INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION (GAS) UNION (GAS) UNION (LIQUID)

{3/8 {1/2 {1/4

E02 A54 620 E02 A56 620 E02 815 666 E02 155 666 E02 151 667

1 1

MSZ- MSY-

A09NA A12NA A15NA A17NA A15NA A17NA

Q'ty/unit

No. Part No.

Part name

Remarks

Symbol

in Wiring

Diagram

Model

Part No.

MAC-415FT-E

MSZ-A09NA MSZ-A12NA MSZ-A15NA

MSY-A15NA MSY-A17NA MSZ-A17NA

Air cleaning filter (Blue bellows type)

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

4. INDOOR UNIT HEAT EXCHANGER

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.

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.

Page 33

MSZ-A24NA

MSZ-A24NA MSY-A24NA

E02 527 970 E02 685 234 E02 888 000 E02 408 142 E02 685 067 E02 888 010 E02 534 100 E02 685 975

E02 888 007

INSTALLATION PLATE BOX FRONT PANEL ASSEMBLY CATCH SCREW CAP GRILLE CATECHIN AIR FIL TER CORNER BOX (RIGHT) AIR CLEANING FILTER LAMP PANEL

Symbol

in Wiring

Diagram

Q'ty/unit

Including No.5,6

4PCS/ SET 3PCS/ SET

1PC/ SET

MAC-2300FT

RemarksPart No.

No.

Part Name

1 2 3 4 5 6 7 8 9

1 1 1 4 3 1 2 1 2 1

E02 A58 620 E02 527 666 E02 151 667

{5/8 {1/4

1 1 1

INDOOR HEAT EXCHANGER UNION (GAS) UNION (LIQUID)

11 12 13

MSY-A24NA

6. INDOOR UNIT STRUCTURAL PARTS

1 2

7. INDOOR UNIT HEAT EXCHANGER

4 5

6. INDOOR UNIT STRUCTURAL PARTS

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

8 9

(See 10-10.)

12 13

7. INDOOR UNIT HEAT EXCHANGER

Page 34

E02 527 302 E02 408 509 E02 001 504 E02 408 702 E02 A58 235 E02 685 040 E02 685 041 E02 527 034 E02 A58 300 E02 448 303 E02 408 303 E02 918 333 E02 918 329 E02 918 468 E02 A58 452 E02 A53 452 E02 527 308 E02 A58 375

E02 918 307 E02 528 034 E02 529 034

1 2 3 4 5 6 7 8

9 10 11 12 13 14

15 16

17 18 19 20

LINE FLOW FAN BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE VANE UPPER VANE LOWER VANE CRANK SET INDOOR FAN MOTOR ASSEMBLY VANE MOTOR (VERTICAL) VANE MOTOR (HORIZONTAL) MOTOR BAND DISPLAY P.C. BOARD RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ROOM TEMPERATURE THERMISTOR TERMINAL BLOCK INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET(RIGHT) VANE MOTOR SUPPORT SET(LEFT)

Symbol

in Wiring

Diagram

Q'ty/unit

RIGHT & LEFT UP & DOWN

RemarksPart No.

No.

Part Name

MF MV2 MV1

RT11

RT12, RT13

1 1 1 1 1 1 1 1 1 2 1 1 1 1 1

1 1 1 1 1

1 1 1 1 1 1 1 1 1 2 1 1 1 1

1 1 1 1 1 1

RC0J56 -

AUTO RESTART AUTO RESTART

MSZ-A24NA MSY-A24NA

W2 W2

W1 Including FAN MOTOR RUBBER MOUNT W2 Including SW P.C. BOARD

MSZ-A24NA

21 22

E02 A58 426 E02 A53 426 E02 527 083

REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER HOLDER

1 1

KM06B KM06D

MSY-A24NA

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

1 2

9. ACCESSORY AND REMOTE CONTROLLER

5 6

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

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

9. ACCESSORY AND REMOTE CONTROLLER

Page 35

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 MSY-A24NA

MAC-2300FT

Air cleaning filter (Anti-allergy enzyme filter:blue bellows type)

Page 36

10-2. RoHS PARTS LIST (RoHS compliant)

No.

RoHS

Part No.

Part name

Remarks

Symbol

in Wiring

Diagram

Q'ty/unit

1 2 3 4 5 6 7 8 9

G G G G G G G G G G

G G G G G

MSZ- MSY-

REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER HOLDER

KM06A KM06C KM07L KM07J

BOX PANEL ASSEMBLY SCREW CAP FRONT PANEL CATECHIN AIR FILTER (LEFT) CATECHIN AIR FILTER (RIGHT) AIR CLEANING FILTER CORNER BOX (RIGHT) INSTALLATION PLATE CONDUIT PLATE

Including No.3,4 2PCS/SET

MAC-415FT-E

E12 A32 234 E12 A49 000 E12 913 067 E12 915 010 E12 915 100 E12 916 100

E12 A32 975 E12 913 970 E12 A49 978

111

E12 A54 426 E12 A49 426 E12 C30 426 E12 C22 426 E12 527 083

1 1 2 1 1 1 1 1 1 1

1 1 2 1 1 1 1 1 1

111

1 1

A09NA A12NA A15NA A17NA A15NA A17NA

- 1 - 1

- 1 - 1 - 1 - 1

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

1. INDOOR UNIT STRUCTURAL PARTS

2. ACCESSORY AND REMOTE

CONTROLLER

1. INDOOR UNIT STRUCTURAL PARTS

7 (See 10-5.)

2. ACCESSORY AND REMOTE CONTROLLER

Page 37

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

BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE ASSEMBL Y NOZZLE ASSEMBL Y VANE MOTOR UNIT (HORIZONTAL) HORIZONTAL VANE POWER MONITOR RECEIVER P.C. BOARD HOLDER CONDUIT COVER CONDUIT COVER TERMINAL BLOCK COVER TERMINAL BLOCK COVER TERMINAL BLOCK HOLDER TERMINAL BLOCK HOLDER TERMINAL BLOCK ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ELECTRONIC CONTROL P.C. BOARD W1 ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR INDOOR COIL THERMISTOR SWITCH HOLDER INDOOR FAN MOTOR W2 MOTOR BAND LINE FLOW FAN

UP & DOWN

AUTO RESTART AUTO RESTART AUTO RESTART AUTO RESTART AUTO RESTART AUTO RESTART

RC0J30-

RT11 RT12, RT13 RT12, RT13

No. Part No.

Part name

Remarks

Symbol

in Wiring

Diagram

Q'ty/unit

1 2 3

4 5

6 7 8 9

11 12

14 15 16

17 18 19

RoHS

G G G G G G G G G G G G G G G G G G G G G G G G G G G G

E12 751 509 E12 001 504 E12 897 702 E12 A54 235 E12 A56 235 E12 897 303 E12 913 040 E12 915 095 E12 A49 979 E12 C30 979 E12 A49 780 E12 C30 780 E12 A49 779 E12 C30 779 E12 913 375 E12 A54 452 E12 A55 452 E12 A56 452 E12 A57 452 E12 A51 452 E12 A52 452 E12 897 308 E12 A54 307 E12 A56 307 E12 915 782 E12 A54 300 E12 897 333 E12 897 302

1 1 1

1 1 1 1 1

1 1 1

1 1 1 1 1

1 1

1 1 1 1 1

W1 Including SW P.C. BOARD and POWER MONITOR RECEIVER P.C. BOARD W2 Including FAN MOTOR RUBBER MOUNT (2 PCS/SET)

MSZ- MSY-

A09NA A12NA A15NA A17NA A15NA A17NA

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

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

3 4

Page 38

2 3

G G G G G

INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION (GAS) UNION (GAS) UNION (LIQUID)

{3/8 {1/2 {1/4

E12 A54 620 E12 A56 620 E12 815 666 E12 155 666 E12 151 667

1 1

MSZ- MSY-

A09NA A12NA A15NA A17NA A15NA A17NA

Q'ty/unit

- 1 - 1 - 1 - 1 - 1 - 1

No.

RoHS

Part No.

Part name

Remarks

Symbol

in Wiring

Diagram

Model

Part No.

MAC-415FT-E

MSZ-A09NA MSZ-A12NA MSZ-A15NA

MSY-A15NA MSY-A17NA MSZ-A17NA

Air cleaning filter (Blue bellows type)

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

4. INDOOR UNIT HEAT EXCHANGER

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.

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.

Page 39

MSZ-A24NA

MSZ-A24NA MSY-A24NA

E12 527 970 E12 685 234 E12 888 000 E12 408 142 E12 685 067 E12 888 010 E12 534 100 E12 685 975

E12 888 007

INSTALLATION PLATE BOX FRONT PANEL ASSEMBLY CATCH SCREW CAP GRILLE CATECHIN AIR FIL TER CORNER BOX (RIGHT) AIR CLEANING FILTER LAMP PANEL

Symbol

in Wiring

Diagram

Q'ty/unit

Including No.5,6

4PCS/ SET 3PCS/ SET

1PC/ SET

MAC-2300FT

RemarksPart No.

No.

Part Name

1 2 3 4 5 6 7 8 9

RoHS

G G G G G G G G G G

1 1 1 4 3 1 2 1 2 1

- 1 - 1

E12 A58 620 E12 527 666 E12 151 667

{5/8 {1/4

1 1 1

INDOOR HEAT EXCHANGER UNION (GAS) UNION (LIQUID)

11 12 13

G G G

MSY-A24NA

6. INDOOR UNIT STRUCTURAL PARTS

1 2

7. INDOOR UNIT HEAT EXCHANGER

4 5

6. INDOOR UNIT STRUCTURAL PARTS

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

8 9

(See 10-10.)

12 13

7. INDOOR UNIT HEAT EXCHANGER

Page 40

E12 A58 426 E12 A53 426 E12 C26 426 E12 C29 426

E12 527 083

G G G G G

REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER HOLDER

1 1

KM06B KM06D KM07K KM07M

E12 527 302 E12 408 509 E12 001 504 E12 408 702 E12 A58 235 E12 685 040 E12 685 041 E12 527 034 E12 A58 300 E12 448 303 E12 408 303 E12 918 333 E12 918 329 E12 918 468 E12 A58 452 E12 A53 452 E12 527 308 E12 A58 375 E12

918 307 E12 528 034 E12

529 034

1 2 3 4 5 6 7 8

9 10 11 12 13 14

15 16

17 18 19 20

Symbol

in Wiring

Diagram

Q'ty/unit

RIGHT & LEFT UP & DOWN

RemarksPart No.

No.

G G G G G G G G G G G G G G G G G G G G G

RoHS

Part Name

MF MV2 MV1

RT11

RT12, RT13

1 1 1 1 1 1 1 1 1 2 1 1 1 1 1

1 1 1 1 1

1 1 1 1 1 1 1 1 1 2 1 1 1 1

1 1 1 1 1 1

1 1 1 1 1 1 1 1 1 2 1 1 1 1 1

1 1 1 1 1

1 1 1 1 1 1 1 1 1 2 1 1 1 1

1 1 1 1 1 1

RC0J56 -

AUTO RESTART AUTO RESTART

MSZ-A24NA MSY-A24NA

- 1 - 1

W2 W2

W1 Including FAN MOTOR RUBBER MOUNT W2 Including SW P.C. BOARD

MSZ-A24NA MSY-A24NA

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

1 2

9. ACCESSORY AND REMOTE CONTROLLER

5 6

13 14

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

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

9. ACCESSORY AND REMOTE CONTROLLER

Page 41

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 MSY-A24NA

MAC-2300FT

Air cleaning filter (Anti-allergy enzyme filter:blue bellows type)

Page 42

Approx. 4°F or more

Difference between target temperature and room temperature

Approx. 4°F or less

—

This shows that the air conditioner is operating to reach the target temperature. Please wait until the target temperature is obtained.

This shows that the room temperature is approaching the target temperature.

This shows a state of standby for operation. (For multi system air conditioner)

Operation state

Indication

Lighted

Blinking

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

Not lighted

Operation Indicator

MICROPROCESSOR CONTROL

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

WIRELESS REMOTE CONTROLLER

Signal transmitting section

Operation display section

ON/OFF (operate/

stop) button

Temperature buttons

Indication of remote controller model is on back

(This diagram shows an overall view.)

w These pictures show MSZ-A24.

VANE button (Horizontal vane button)

Operation select button

NOTE

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

ECONO COOL button

WIDE VANE button (V

ertical vane button)

(MSZ-A24, MSY-A24)

POWERFUL button

RESET button

(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.

Page 43

11-1. COOL ( ) OPERATION

Mode

COOL mode of

"I FEEL CONTROL"

DRY mode of

"I FEEL CONTROL"

Initial room temperature

75°F or more

less than 75°F

(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( d )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 tempera-

ture at start-up of the operation.

• 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.

Page 44

Model

COOL mode of

"I FEEL CONTROL"

DRY mode of

"I FEEL CONTROL"

Initial room temperature Initial set temperature

79°F or more

77°F to 79°F

less than 77°F

75°F

Initial room temperature minus 4°F

❈1

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

TOO

COOL

TOO

WARM

❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-

less 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.

…

To raise the set temperature 2~4 degrees (°F)

…

To lower the set temperature 2~4 degrees (°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 degrees below the set temperature. HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 4 degrees 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”.

Page 45

11-7. AUT O VANE OPERATION

Upward

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. 12V) 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) In COOL and DRY operation

(2) In HEAT operation (MSZ)

(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 CONTROLbutton, 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.

Vane angle is fixed to Horizontal position or Angle 1.

Vane angle is fixed to Angle 4.

Page 46

The air conditioner starts heating operation approx. 3 minutes after the vane has moved to the horizontal position.

• Sometimes the area around your feet may not warm. To warn the area around the feet, set the horizontal v

ane to (AUTO) or the downwardblowing position.

• When VANE CONTROL button is pressed again, the vane returns to the previously-set position and the air conditioner starts the heating operation in approx. 3 minutes.

To change the air

flow direction

When to use this function?

Use this function if you don’t want the air from the indoor unit to blow directly onto your body.

• Depending on the shape of the room, the air may blow directly onto your body.

• Press VANE CONTROL button again to return the

vane to the previously-set position.

The air conditioner starts the cooling or drying operation approx. 3 minutes after the vane has moved to the horizontal position.

•

Pressing and holding VANE CONTROL

button for 2 seconds

or more causes the horizontal vane to reverse and move to horizontal position.

COOL/DRY

HEAT

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.

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

Horizontal

position

When VANE CONTROL button is pressed again, the vane returns to the previously-set position and the air conditioner starts the cooling or drying operation in approx. 3 minutes.

(for MSZ)

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

45SWING

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.

) 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. 12V) transmitted from microprocessor.

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

(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 “”.

Page 47

START

STOP

START

STOP

(5) WIDE MODE ( )

By selecting WIDE mode with WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the remote controller (W). The remote controller displays “”.

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

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

• Pressing thoes 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 ). w

w 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.

Page 48

11-9. EMERGENCY/TEST OPERATION

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

Press RESET button gently using a thin stick.

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.

EMERGENCY OPERATION switch

11-10. Changing temperature indication (__F/__C)

MSZ-A•NAMSY-A•NA-

1 1

E.O.

Operation mode COOL Set temperature

Fan speed Medium Medium Horizontal vane Auto Auto

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

Operation indicator lamp (MSZ type)

Press once <Cool>

Press again <Heat>

Press once again <Stop>

(MSY type)

Press once <Cool>

Press again <Stop>

75°F

HEAT

(MSZ)

75°F

Lighted Not lighted

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

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 May 2007 Specifications subject to change without notice.

Mitsubishi Electronics MSY-A15NA, MSZ-A15NA, MSZ-A09NA, MSY-A17NA, MSZ-A17NA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual