Logitech Air Conditioner MSZ A09NA User Manual

Revision C:

• SPECIFICATION has been corrected.

Please void OB450 REVISED EDITION-B.

INDOOR UNIT

No. OB450

REVISED EDITION-C

SERVICE MANUAL

Wireless type

Models

MSZ-A09NA

MSZ-A09NA -

MSZ-A12NA

MSZ-A12NA -

MSZ-A15NA

MSZ-A15NA -

MSZ-A17NA

MSZ-A17NA -

MSZ-A24NA

MSZ-A24NA -

MSY-A15NA

MSY-A15NA -

MSY-A17NA

MSY-A17NA -

MSY-A24NA

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

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

MSZ-A09/12/15/17NA

MSY-A15/17NA

NOTE:

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

For servicing of RoHS compliant products, refer to the PARTS

LIST (RoHS compliant).

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PART NAMES AND FUNCTIONS

MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA

MSZ-A15NA

MSZ-A24NA

MSY-A24NA

Front panel

MSZ-A17NA

Air inlet

Heat exchanger

Panel

Air cleaning filter

(Anti-Allergy Enzyme

Filter, Blue bellows

type)

Catechin air filter

Air outlet

Vertical vane

Remote controller

Horizontal vane

Line flow fan

Display section

Operation section

(When the front panel is opened)

MSZ-A09NA

MSZ-A12NA

MSZ-A15NA

MSZ-A17NA

MSY-A15NA

MSY-A17NA

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

MSZ-A24NA

MSY-A24NA

MSY-A15/17NA

MSY-A15/17NA-

Installation plate

Installation plate ﬁxing screw 4 × 25 mm

Remote controller holder

Fixing screw for 3.5 × 1.6 mm (Black)

Battery (AAA) for remote controller

Wireless remote controller

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

Conduit plate

–

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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

Min. circuit ampacity

Fan motor

1.0

F.L.A

0.76

152-229-307-338

(134-205-275-303)

159-222-307-321

2.3

152-240-353-388

(134-215-318-349)

159-240-353-353

3.2

COOL Dry (Wet)

HEAT

Airﬂow

CFM

Low–Med.–High–Powerful

Moisture removal

pt./h

dB(A)

in.

COOL

HEAT

22-33-38-41

22-33-38-39

22-34-42-44

22-34-42-42

Sound level

Low–Med.–High–Powerful

Cond. drain connection O.D.

Dimensions

5/8

30-11/16

8-/1/4

in.

Ib.

11-/3/4

Weight

Remote controller

Wireless type

12-24 VDC

Control voltage (by built-in transformer)

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

Min. circuit ampacity

Fan motor

1.0

F.L.A

0.76

COOL Dry (Wet)

HEAT

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

Airﬂow

CFM

pt./h

dB(A)

in.

Low–Med.–High–Powerful

254-314-381-381

—

254-314-381-381

—

Moisture removal

4.7

34-40-45-47

34-38-44-44

5.1

COOL

HEAT

34-40-46-48

Sound level

Low–Med.–High–Powerful

—

34-38-44-44

—

Cond. drain connection O.D.

Dimensions

5/8

30-/11/16

8-/1/4

11-/3/4

in.

Ib.

Weight

Remote controller

Wireless type

12-24 VDC

Control voltage (by built-in transformer)

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

Min. circuit ampacity

Fan motor

1.0

F.L.A

0.76

COOL Dry (Wet)

HEAT

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

296-486-568-590

Airﬂow

CFM

pt./h

dB(A)

in.

Low–Med.–High–Powerful

—

Moisture removal

7.3

COOL

HEAT

34-40-49-51

Sound level

Low–Med.–High–Powerful

34-40-48-49

Cond. drain connection O.D.

Dimensions

5/8

43-/5/16

10-/1/4

in.

Ib.

12-13/16

Weight

Remote controller

Wireless type

12-24 VDC

Control voltage (by built-in transformer)

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

1 : Rating conditions

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

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

(Heating) — Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB

2 :

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3-1. OPERATING RANGE

(1) POWER SUPPLY

Rated voltage

Guaranteed Voltage (V)

208/230 V

1 phase

60 Hz

Min.187

208

230

Max.253

Indoor unit

(2) OPERATION

Intake air temperature (°F)

Mode

Condition

Standard temperature

Maximum temperature

Minimum temperature

Maximum humidity

Indoor

Outdoor

115

—

Cooling

—

78%

—

Standard temperature

Heating Maximum temperature

Minimum temperature

3-2. OUTLET AIR SPEED AND COVERAGE RANGE

Air speed

(ft./sec.)

Coverage

range (ft.)

Model

Mode

HEAT

COOL

HEAT

COOL

HEAT

COOL

HEAT

COOL

HEAT

COOL

Function Air ﬂow (CFM)

Dry

Wet

Dry

Wet

Dry

Wet

Dry

Wet

Dry

Wet

307

275

353

318

381

342

381

342

568

508

16.8

15.1

19.3

17.4

20.9

18.8

20.9

18.8

20.2

18.1

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 guide-

line since it varies according to

the size of the room and furni-

ture arranged inside the room.

MSZ-A09NA

MSZ-A12NA

MSZ-A15NA

MSY-A15NA

MSZ-A17NA

MSY-A17NA

MSZ-A24NA

MSY-A24NA

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OUTLINES AND DIMENSIONS

Unit : inch

MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA

MSZ-A15NA

MSZ-A17NA

Conduit plate(MSZ-A•NA-

7/16x1 Oblong hole

and MSY-A•NA-

are excluded.)

7/16x13/16 Oblong hole

Installation plate

8-7/8

2-3/16

hole

7/8

30-11/16

6-1/8 6-1/8

1-3/4

2-3/4

2-3/16

13-3/16

Air in

12-5/8

Indoor unit

Wall hole 2-9/16

3/16

8-1/4

Installation plate

Liquid line 1/4 19-11/16

Gas line 3/8 16-15/16

Insulation 1-3/8 O.D

3/4 I.D

{

Drain hose 5/8

(Connected part O.D)

2-1/8

24-9/16

2-5/16

Air out

Insulation 1-1/8

3/4

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Unit : inch

MSZ-A24NA

MSY-A24NA

Installation plate

Indoor unit

6-13/16

3-7/8

42-1/16

3-7/8

16-5/16

6-13/16

Wall hole

3/16

Installation plate

10-1/4

43-5/16

Air in

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

2-3/16

2-5/16

31-1/8

3/4

9-15/16

Drain hose 5/8

(Connected part O.D)

Air out

Insulation 1-1/8

Wireless remote controller

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WIRING DIAGRAM

MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA

MSZ-A15NA

MSZ-A17NA

MSZ-A24NA

MSY-A24NA

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REFRIGERANT SYSTEM DIAGRAM

Unit : inch

MSZ-A09NA

MSZ-A12NA

MSZ-A15NA MSY-A15NA

MSZ-A17NA MSY-A17NA

Refrigerant pipe ø1/2

(with heat insulator)

Refrigerant pipe ø3/8

(with heat insulator)

Indoor coil

thermistor

RT12(main)

Indoor coil

thermistor

RT12(main)

Indoor

heat

exchanger

Distributor

Flared connection

Indoor coil

thermistor

RT13(sub)

Indoor coil

thermistor

RT13(sub)

Room temperature

thermistor

RT11

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø1/4

(with heat insulator)

Refrigerant pipe ø1/4

(with heat insulator)

MSZ-A24NA

MSY-A24NA

Refrigerant pipe ø5/8

(with heat insulator)

Indoor coil

thermistor

RT12(main)

Indoor

heat

exchanger

Distributor

Flared connection

Indoor coil

thermistor

RT13(sub)

Room temperature

thermistor

RT11

Flared connection

Refrigerant flow in cooling

Refrigerant flow in heating

Refrigerant pipe ø1/4

(with heat insulator)

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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

1 unit operation

No modiﬁcation

2 units operation

Same as at left

3 units operation

Same as at left

Solder J2

4 units operation

Same as at left

No. 1 unit

No. 2 unit

No. 3 unit

No. 4 unit

—

Solder J1

—

Same as at left

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.

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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

MSY-A15/17NA

MSZ-A24NA

MSY-A24NA

CN152

JR07

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 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 confirm-

ing 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

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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

of the batteries is correct.

RESET button

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.

Lighted

OPERATION INDICATOR

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.

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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.

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. 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 emit-

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

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.

(OFF)

of OPERATION INDICATOR lamp.

Yes

(Blinks)

Judgment of indoor/outdoor abnormality

Before blinking, does the left lamp of OPERATION INDICA-

TOR lamp stay ON for 3 seconds?

Yes

Stays ON for 3 seconds (without beep):

The outdoor unit is abnormal.

The indoor unit is abnormal.

The outdoor unit is abnormal.

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

failure mode table. (8-2.2.)

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.

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-

second interval

Blinking at 0.5-

second interval

2.5-second OFF

OFF

Beeps

Repeated cycle

3.Blinking pattern when the outdoor unit is abnormal:

Blinking at 0.5-

second interval

2.5-second OFF

3-second ON

second interval

2.5-second OFF

3-second ON

OFF

No beep

Beeps

No beep

Beeps

Repeated cycle

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2. Indoor unit failure mode table

Left lamp of OPERATION

INDICATOR lamp

Abnormal point

(Failure mode)

Condition

—

Correspondence

—

Not lighted

Normal

The room temperature thermistor short or

open circuit is detected every 8 seconds dur-

ing operation.

1-time ﬂash every Room temperature

Refer to the characteristics of the room temperature

thermistor (8-7.).

0.5-second

thermistor

Indoor coil

thermistor

2-time ﬂash

2.5-second OFF

The indoor coil thermistor short or open circuit Refer to the characteristics of the main indoor coil ther-

is detected every 8 seconds during operation. mistor, the sub indoor coil thermistor (8-7.).

3-time ﬂash

2.5-second OFF

The serial signal from outdoor unit is not re-

ceived for a maximum of 6 minutes.

Refer to 8-6. "How to check miswiring and serial

signal error".

Serial signal

The rotational frequency feedback signal is

not emit during the 12 seconds the indoor fan Refer to 8-6. "Check of indoor fan motor".

operation.

11-time ﬂash

2.5-second OFF

Indoor fan motor

It cannot properly read data in the nonvolatile

memory of the indoor electronic control P.C.

board.

12-time ﬂash

2.5-second OFF

Indoor control

system

Replace the indoor electronic control P.C. board.

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

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8-3. INSTRUCTION OF TROUBLESHOOTING

Start

Indoor unit operates.

Indoor unit oper-

Indoor unit

OPERATION INDICATOR

lamp on the indoor unit is

ﬂashing on and off.

Outdoor unit doesn't

ates.

doesn't receive

the signal from

remote controller.

operate normally.

Outdoor unit

doesn't operate.

If blinking of OPERATION INDI-

CATOR lamp cannot be checked,

it can be checked with failure

mode recall function.

Indoor unit

Outdoor unit

operates only

in Test Run

operation.

Outdoor

Unit doesn't

operate nor-

mal operation

in COOL or

HEAT mode.

operates, when

EMERGENCY

OPERATION

doesn't operate,

when EMER-

GENCY OPERA-

TION switch is

pressed.

unit doesn't

operate even

in Test Run

operation.

"Test Run operation" means

the operation within 30 minutes

after EMERGENCY OPERA-

TION switch is pressed.

switch is pressed.

1. Check indoor/out-

door connecting wire.

(Check if the power is

supplied to the indoor

unit.)

2. Refer to 8-6. "Check

of indoor electronic

control P.C. board and

indoor fan motor".

Check room

temperature

thermistor.

Refer to 8-7.

"Test point

diagram and

voltage".

Refer to

Refer to 8-6.

Refer to "How

to check

inverter/com-

pressor".

"Check of R.V. "Check of remote

coil".

controller and

receiver P.C.

board".

Refer to outdoor unit service manual.

Left lamp

7-time ﬂash 14-time ﬂash

Cause: Cause:

Outdoor unit Outdoor unit

• Trouble of • Other ab-

outdoor con- normality

trol system

Left lamp

6-time ﬂash

Cause:

Flash on and

2-time ﬂash

3-time ﬂash 4-time ﬂash 5-time ﬂash

off at 0.5-sec- Cause:

Cause:

Outdoor unit

• Trouble of

thermistor in

outdoor unit

ond intervals

Cause:

Indoor unit

• Trouble

Indoor unit Indoor unit

• Trouble of • Trouble

Outdoor unit

• Outdoor

power

Indoor/Outdoor of room

indoor fan

of indoor

unit control

system

unit

temperature motor

/ indoor coil

thermistor

system

abnormality

• Miswiring or

trouble of

serial signal

Refer to 8-6. Check room Refer to 8-6. Replace the Refer to

Refer to

Replace the Check "Flow

inverter P.C. chart of the

"How to

check mis-

wiring and

temperature

thermistor

and indoor

"Check of indoor elec-

"How to

tronic control check

P.C. board.

"Check of

indoor fan

motor".

outdoor ther- board or

detailed

inverter/com- mistors".

pressor".

the outdoor outdoor unit

electronic failure mode

control P.C. recall func-

board. tion."

serial signal coil thermis-

error".

tor. Refer

to 8-7."Test

point diagram

and voltage".

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8-4. TROUBLESHOOTING CHECK TABLE

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

When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the

power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.

OPERATION INDICATOR

Lighted

Blinking

Not lighted

Abnormal

No.

Operation indicator lamp

Symptom

Condition

Correspondence

point

Left lamp ﬂashes.

0.5-second ON

Miswiring

or serial

signal

• Refer to 8-6. "How to check

miswiring and serial signal er-

ror".

The serial signal from the outdoor unit is not

received for 6 minutes.

0.5-second OFF

Left lamp ﬂashes.

2-time ﬂash

Indoor coil

thermistor

• Refer to 8-7. the characteristics

of indoor coil thermistor, and

the room temperature thermis-

tor.

The indoor coil or the room temperature ther-

mistor is short or open circuit.

Room tem-

perature

2.5-second OFF

thermistor

Left lamp ﬂashes.

3-time ﬂash

Indoor fan

motor

The rotational frequency feedback signal is

not emitted during the indoor fan operation.

• Refer to 8-6. "Check of in-

door fan motor".

2.5-second OFF

Left lamp ﬂashes.

4-time ﬂash

It cannot properly read data in the nonvolatile

memory of the indoor electronic control P.C.

board.

Indoor con-

trol system

• Replace the indoor electronic

control P.C. board.

2.5-second OFF

Indoor unit and

outdoor unit do

not operate.

Left lamp ﬂashes.

5-time ﬂash

• Refer to "How to check of in-

verter/compressor".

It consecutively occurs 3 times that the com-

pressor stops for overcurrent protection or

start-up failure protection within 1 minute after

start-up.

Outdoor

power sys-

tem

Refer to outdoor unit service

manual

2.5-second OFF

• Check the stop valve.

Left lamp ﬂashes.

6-time ﬂash

• Refer to "Check of outdoor

thermistor".

Refer to outdoor unit service

manual.

Outdoor

thermistors

The outdoor thermistors short or open circuit

during the compressor operation.

2.5-second OFF

Left lamp ﬂashes.

7-time ﬂash

• Replace the inverter P.C. board

or the outdoor electronic con-

trol P.C. board.

Refer to outdoor unit service

manual.

Outdoor

control sys-

tem

It cannot properly read data in the nonvolatile

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

door electronic control P.C. board.

Left lamp ﬂashes.

14-time ﬂash

• Check the stop valve.

Other ab-

normality

An abnormality other than above mentioned

is detected.

• Conﬁrm the abnormality in

detail using the failure mode

recall function for outdoor unit.

2.5-second OFF

Outdoor

control

system

MSZ-A09/12

/15/17

MSY-A15/17

• Check the blinking pattern of

the LED on the inverter P.C.

board or the outdoor electronic

control P.C. board.

Outdoor unit

It cannot properly read data in the nonvolatile

Left lamp lights up

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

ate

door electronic control P.C. board.

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OPERATION INDICATOR

Abnormal

point

No.

Operation indicator lamp

Symptom

Condition

Correspondence

Left lamp lights and lower lamp ﬂashes.

Lower lamp ﬂashes.

The operation mode of the each indoor unit

is differently set to COOL (includes DRY) and • Unify the operation mode.

HEAT at the same time, the operation mode Refer to outdoor unit service

of the indoor unit that has operated at ﬁrst has manual.

the priority.

MXZ type

Operation

mode

Outdoor unit

operates but

indoor unit does

not operate.

2.5-second OFF

setting

8-5. TROUBLE CRITERION OF MAIN PARTS

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

MSY-A15NA MSY-A17NA MSY-A24NA

Part name

Check method and criterion

Figure

Room temperature

thermistor(RT11)

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..

Indoor coil thermistor

(RT12(MAIN),RT13(SUB))

Indoor fan motor(MF)

Check 8-6.

Measure the resistance between the terminals with a tester.

(Part temperature 50 ~ 86°F)

RED

Horizontal vane

motor(MV)

MSZ-A09/12/15/17NA

MSY-A15/17NA

ROTOR

Color of the lead wire

BRN-other one

Normal

YLW

BRN

235 ~ 255 Ω

GRN

ORN

Measure the resistance between the terminals with a tester.

(Part temperature 50 ~ 86°F)

RED

Horizontal vane

motor(MV1)

Vertical vane

motor(MV2)

MSZ-A24NA

MSY-A24NA

ROTOR

Color of the lead wire

BRN-other one

Normal

YLW

BRN

282 ~ 306 Ω

GRN

ORN

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8-6. TROUBLESHOOTING FLOW

A Check of indoor fan motor

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

Turn OFF the power supply.

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

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

EMERGENCY OPERATION switch.

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

GENCY OPERATION switch is pressed.

Is there any foreign matter that interferes

the rotation of the line ﬂow fan?

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

turn ON it again, then measure the voltage.

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

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

Yes

If more than 12 seconds passes after EMERGENCY OPERATION switch

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

indoor electronic control P.C. board is normal

Remove the foreign matter and

adjust the line ﬂow fan.

Is there 294/325 VDC between

CN211

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

voltage between CN211 (+) and (-)

rise to the range of 3 to 6 VDC within

12 seconds after EMERGENCY

OPERATION switch is pressed?

Indoor electronic

control P.C. board

Replace the indoor fan motor.

Yes

Replace the indoor electronic control P.C. board.

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

Measure the voltage between CN211

Is it unchanged holding

(+) and (-) while the fan motor is

rotating.

Replace the indoor electronic control P.C. board.

0 or 15 VDC?

(Changed)

Yes

(Unchanged)

Replace the indoor fan motor.

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

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

Press OPERATE/STOP (ON/OFF)

button on the remote controller.

Is LCD display on the remote controller

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

visible?

(Not clear)

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.

Turn ON a radio to AM and press OP-

ERATE/STOP (ON/OFF) button on the

remote controller.

Does the unit operate with the remote

controller?

Yes

Is noise heard from radio?

Yes

Replace the remote controller.

Are there any ﬂuorescent lights of

inverter or rapid-start type within the

range of 3.28 ft.?

•Reinstall the unit away from lights.

•Attach a ﬁlter on receiving part.

Yes

MSZ-A09/12/15/17NA

MSY-A15/17NA

MSZ-A24NA

MSY-A24NA

Measure the voltage between receiver

P.C. board connector CN301 No.2(+) and

No.3(-) when the remote controller button

is pressed.

Replace the indoor electronic control

P.C. board.

Is the voltage approx. 4 VDC?

No (5 or 0 VDC)

Yes

Replace the receiver P.C. board.

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

Turn OFF the power supply.

Remove indoor fan motor connector CN211

and vane motor connector CN151 from the

indoor electronic control P.C. board and turn

ON the power supply.

Measure the resistance between

CN211 and of the indoor fan motor

connector.

Short/open circuit:

Replace the indoor fan motor.

Does the unit operate with the remote

controller? Does OPERATION INDICATOR

lamp light up by pressing EMERGENCY

OPERATION switch?

Yes

Short/open circuit:

Replace the horizontal vane motor and the

indoor electronic control P.C. board.

Measure the resistance of the horizon-

tal 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?

Turn OFF the power supply.

Check both “parts side” and “pattern

side” of the indoor electronic control

P.C. board visually.

Be sure to check both the fuse

and the varistor in any case.

Is the fuse (F11) blown

only?

Yes

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

black.

Measure the resistance between

(+) and (-) of the indoor fan motor

connector (to CN211 on the indoor

electronic control P.C. board). 1,

2. Connect "+" of the tester to fan motor connector's lead

wire, and "-" to lead wire, otherwise the resistance can-

not be measured properly.

Replace indoor electronic control P.C. board

and the indoor fan motor.

Is the resistance 1 MΩ

or more?

Yes

Replace indoor electronic control

P.C. board.

Measure the resistance of cement

resistor (R111) on the indoor elec-

tronic control P.C. board.

Is the resistance approx.

4 Ω?

Replace the indoor electronic control P.C.

board and the indoor fan motor.

Yes

Replace the indoor electronic control P.C. board.

Indoor electronic

control P.C.Board

Varistor(NR11)

Fuse(F11)

CN211

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D How to check miswiring and serial signal error

Turn OFF the power supply.

Is there rated voltage in the

power supply?

Check the power supply.

Yes

Turn ON the power supply.

Is there rated voltage between

outdoor terminal block S1 and

S2?

Yes

Check the wiring.

Press EMERGENCY OPERATION switch once.

Does the left lamp of OPERATION INDICA-

TOR lamp light up? <Conﬁrmation of the

power to the indoor unit>

Yes

Is there any miswiring, poor

contact, or wire disconnec-

tion of the indoor/outdoor

connecting wire?

Is serial signal error indicated 6 minutes later?

Yes

Correct them.

Yes

Turn OFF the power supply.

Check once more if the indoor/outdoor

connecting wire is not miswiring.

Short-circuit outdoor terminal block S2

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

board during the operation.

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

tion starts.

and S3.

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

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

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

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

(Except for outdoor unit of multi system type)

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-

Replace the inverter P.C. board or

the outdoor electronic control P.C. board.

(Lighted

or not

ON quick blinking"?

2. Be careful to the residual

voltage of smoothing capacitor.

Yes

lighted)

Turn OFF the power supply.

Remove the short-circuit between

outdoor terminal block S2 and S3.

Turn ON the power supply.

Is there amplitude of 10 to 20 VDC

between outdoor terminal block S2 and

S3? <Conﬁrmation of serial signal>

Yes

Is there any error of the in-

Replace the indoor/

outdoor connecting

wire.

door/outdoor connecting wire,

such as the damage of the wire,

intermediate connection, poor

contact to the terminal block?

Yes

• Turn OFF inverter-controlled lighting

equipment.

• Turn OFF the power supply and then

turn ON again.

• Press EMERGENCY OPERATION

switch.

Is there any error of the in-

door/outdoor connecting wire,

such as the damage of the wire,

intermediate connection, poor

contact to the terminal block?

Is there rated voltage between

indoor terminal block S1 and S2?

<Conﬁrmation of power voltage>

Replace the indoor/

outdoor connecting

wire.

• Reinstall

Yes

either the unit

or the light

each other

Yes

away.

Is serial signal

error indicated 6

minutes later?

• Attach a ﬁlter

on remote

control

Yes

Replace the indoor electronic control P.C. board.

receiving

Be sure to release the failure-mode recall function

after checking.

section of the

indoor unit.

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E Electromagnetic noise enters into TV sets or radios

Is the unit grounded?

Yes

Ground the unit.

Is the distance between the antennas

and the indoor unit within 9.91 ft., or is

the distance between the antennas and

the outdoor unit within 9.91 ft.?

Extend the distance between the antennas and

the indoor unit, and/or the antennas and the

outdoor unit.

Yes

Is the distance between the TV sets or

radios and the indoor unit within 3.28

ft., or is the distance between the TV

sets or radios and the outdoor unit

within 9.91 ft.?

Extend the distance between the TV sets and/or

radios and the indoor unit, or the TV sets or

radios and the outdoor unit.

Yes

Are the antennas damaged?

Is the coaxial cable damaged?

Is there any poor contact in the anten-

na wiring?

Replace or repair the antenna.

Replace or repair the coaxial cable.

Yes

Is the indoor/outdoor connecting wire of

the air conditioner and the wiring of the

antennas close?

Extend the distance between the indoor/outdoor

connecting wire of the air conditioner and the wir-

ing of the antennas.

Even if all of the above conditions are fulﬁlled, the electromagnetic noise may enter, depending on the electric ﬁeld strength

or the installation condition (combination of speciﬁc conditions such as antennas or wiring).

Check the followings before asking for service.

1. Devices affected by the electromagnetic noise

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

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

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

4. Layout of ;

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

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

6. Presence or absence of ampliﬁer such as booster

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

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

noise.

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

power ON, and check for the electromagnetic noise.

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

tromagnetic noise.

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

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

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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

Power supply input

208/230 VAC

Varistor (NR11)

Fuse (F11)

250 V 3.15 A

Cement

resistor

(R111)

Indoor fan motor

(CN211)

294/325 VDC

(-) Fiducial terminal of

cathode side on measur-

ing high-voltage DC

15 VDC

(+)3-6 VDC

Release of Auto restart

function

(+)0 or 15 VDC

Solder the Jumper wire

to JR07

(Refer to 7-3.)

5 VDC

Indoor coil thermistor

RT12(MAIN)

RT13(SUB)

(CN112)

Horizontal vane

motor(CN151)

Room temperature

thermistor (RT11)

Timer short mode

}

point JPG, JPS

Power monitor

receiver P.C.

board

(Refer to 7-1.)

12 VDC

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

Room temperature thermistor (RT11)

Emergency

operation switch

SW P.C. board

Temperature (°F)

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MSZ-A24NA MSY-24NA

Indoor electronic control P.C. board

Cement

Release of Auto restart

resistor

Power supply input

208/230 VAC

function

(R111)

Varistor (NR11)

Fuse (F11)

250 V 3.15 A

Solder the Jumper wire

to JR07

(Refer to 6-3.)

Indoor fan motor

(CN211)

294/325 VDC

(-) Fiducial terminal of

cathode side on measur-

ing high-voltage DC

Display

P.C.

board

15 VDC

(+)3-6 VDC

(+)0 or 15 VDC

5 VDC

Indoor coil thermis-

tor RT12(MAIN)

RT13(SUB)

Horizontal vane

motor (CN151)

Room temperature

thermistor (RT11)

Timer short

mode point

}

JPG, JPS

(Refer to 7-1.)

Vertical vane motor (CN152)

12 VDC

Receiver

P.C. board

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

Room temperature thermistor (RT11)

SW P.C. board

Temperature (°F)

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DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

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

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

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

Check the shape of the terminal before detaching.

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

(2) The terminal with this connector has the

locking mechanism.

Sleeve

Slide the sleeve.

Hold the sleeve, and

Pull the terminal while

pushing the locking

pull out the terminal

slowly.

Locking lever

lever.

Connector

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

OPERATING PROCEDURE

PHOTOS

1. Removing the panel

Photo 1

(1) Remove the horizontal vane.

(2) Remove the screw caps of the panel. Remove the

screws. (Photo 1)

(3) Hold the lower part of both ends on the panel and pull

it slightly toward you, and then remove the panel by

pushing it upward.

Photo 3

Screws of the panel

Horizontal vane

Screw of the

conduit cover

Terminal block

cover

Photo 2

Conduit cover

Terminal block

cover

Conduit cover

Screw of the

conduit cover

MSZ-A09/12/15/17NA -

MSY-A15/17NA -

Conduit plate

MSZ-A09/12/15/17NA

MSY-A15/17NA

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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

Photo 4

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

corner box.

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

(Photo 2 or Photo 3)

(3) Remove the indoor/outdoor connecting wire.

(4) Remove the switch holder from the electrical cover. (Photo

Switch holder

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

electrical cover. (Photo 4)

(6) Remove the ground wire connected to the indoor electronic

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

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

the catch. (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.

Screw of the

electrical cover.

Power monitor

receiver

P.C. board holder

(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.)

Photo 5

Ground wire

Indoor fan motor

connector (CN211)

Indoor coil thermistor

connector (CN112)

(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. (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. (Photo 6)

Vane motor

connector (CN151)

(15) Remove the terminal block by sliding it.

Photo 6

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. (Photo 2 or Photo 3

)

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

(4) Remove the ground wire connected to the heat exchang-

er from the electrical box. (Photo 5)

(5) Disconnect the following connectors on the electronic

control P.C. board; the fan motor connector <CN211>, the

indoor coil thermistor connector <CN112>, the vane motor

connector <CN151>. (Photo 5)

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

electrical box.

Screw

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OPERATING PROCEDURE

PHOTOS

4. Removing the horizontal vane motor unit

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

corner box.

Photo 7

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

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

(3) Disconnect the connector from the horizontal vane motor

unit.

Screws of the

horizontal vane

motor unit

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

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

corner box.

Motor band

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

(3) Remove the drain hose from the nozzle assembly, and

remove the nozzle assembly.

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

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

(6) Remove the motor bed together with fan motor and motor

band.

(7) Release the hooks of the motor band, and remove the

motor band then pull out the indoor fan motor.

(8) Remove the screws fixing the left side of the heat exchang-

Screws of

the motor

bed

er. (Photo 10)

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

lower-left.

Photo 9

Screw of

the line flow

fan

Photo 10

Screws of the

left side of the

heat exchanger

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9-2.MSZ-A24NA MSY-A24NA

OPERATING PROCEDURE

PHOTOS

1. Removing the front panel

Photo 1

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.

Corner box

Screws

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

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

Photo 2

Screw of the ground wire

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

(2) Remove the corner box

Indoor

electronic

control

(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.

P.C. board

(6) Remove the screw of the conduit cover.

(7) Remove the conduit cover.

T.B. SW 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.

Screw of

T.B. SW cover

Screw of the

electrical cover

Conduit cover

Receiver

P.C. board

R.L

holder

Screw of

conduit cover

Screw of the

ground wire

3. Removing the electrical box

Photo 3

(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 elec-

tronic control P.C. board.

(5) Remove the screw of ground wire to the heat exchanger.

(6) Remove the fan motor lead wire and indoor coil thermistor

from the electrical box.

(7) Remove the lead wire of vane motor from the bottom of

electrical box.

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

electrical box.

Screw of the

electrical box

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OPERATING PROCEDURE

PHOTOS

4. Removing the vane motor

Photo 4

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

(2) Remove the electrical cover. (Refer to 2.)

(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.

Vane motors

Screws

of the

vane

motor

(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.

Photo 6

(4) Remove the water cut.

Screws fixing

the left side

of the heat

exchanger

(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 exchang-

er.

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

Photo 7

(10) Remove the line flow fan.

Water cut

Photo 8

Hole

cover

Screws of the motor bed

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10 PARTS LIST

10-1. PARTS LIST (non-RoHS compliant)

MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA

MSZ-A15NA

MSZ-A17NA

1. INDOOR UNIT STRUCTURAL PARTS

2. ACCESSORY AND REMOTE

CONTROLLER

(See 10-1.5.)

1. INDOOR UNIT STRUCTURAL PARTS

Q'ty/unit

Symbol

in Wiring

Diagram

MSZ-

MSY-

No.

Part No.

Part name

Remarks

A09NA A12NA A15NA A17NA A15NA A17NA

E02 A32 234 BOX

E02 A49 000 PANEL ASSEMBLY

E02 913 067 SCREW CAP

E02 915 010 FRONT PANEL

E02 915 100 CATECHIN AIR FILTER (LEFT)

E02 916 100 CATECHIN AIR FILTER (RIGHT)

Including No.3,4

2 PC/SET

—

AIR CLEANING FILTER

MAC-415FT-E

E02 A32 975 CORNER BOX (RIGHT)

E02 913 970 INSTALLATION PLATE

10 E02 A49 978 CONDUIT PLATE

2. ACCESSORY AND REMOTE CONTROLLER

E02 A54 426

KM06A

KM06C

REMOTE CONTROLLER

E02 A49 426

REMOTE CONTROLLER

HOLDER

12 E02 527 083

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

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

Q'ty/unit

Symbol

in Wiring

Diagram

MSZ-

MSY-

No.

Part No.

Part name

Remarks

A09NA A12NA A15NA A17NA A15NA A17NA

E02 751 509 BEARING MOUNT

E02 001 504 SLEEVE BEARING

E02 897 702 DRAIN HOSE

E02 A54 235

NOZZLE ASSEMBLY

E02 A56 235

VANE MOTOR UNIT

(HORIZONTAL)

E02 897 303

UP & DOWN

E02 913 040 HORIZONTAL VANE

POWER MONITOR RECEIVER

P.C. BOARD HOLDER

E02 915 095

E02 A49 979 CONDUIT COVER

E02 A49 780 TERMINAL BLOCK COVER

10 E02 A49 779 TERMINAL BLOCK HOLDER

11 E02 913 375 TERMINAL BLOCK

E02 A54 452

E02 A55 452

E02 A56 452

E02 A57 452

E02 A51 452

E02 A52 452

ELECTRONIC CONTROL P.C.

BOARD 1

ROOM TEMPERATURE

THERMISTOR

13 E02 897 308

RT11

E02 A54 307

RT12,

RT13

INDOOR COIL THERMISTOR

E02 A56 307

15 E02 915 782 SWITCH HOLDER

16 E02 A54 300 INDOOR FAN MOTOR W2

17 E02 897 333 MOTOR BAND

^RC0J30-□□

18 E02 897 302 LINE FLOW FAN

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

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

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

4. INDOOR UNIT HEAT EXCHANGER

Q'ty/unit

Symbol

MSZ-

MSY-

No.

Part No.

Part name

in Wiring

Diagram

Remarks

A09NA A12NA A15NA A17NA A15NA A17NA

E02 A54 620

E02 A56 620

E02 815 666

E02 155 666

INDOOR HEAT EXCHANGER

UNION (GAS)

ø3/8

ø1/2

ø1/4

E02 151 667 UNION (LIQUID)

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

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

● Normal life of AIR CLEANING FILTER is 1 year.

If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm

water) and rinse it delicately, without removing the filter from the frame about once every 3 months.

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

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

Model

Part No.

MSZ-A09/12/15/17NA

MSY-A15/17NA

MAC-415FT-E

Replacement of the air cleaning filter

(2) Remove the air cleaning filter (Blue bel-

lows type) from the catechin air filter.

(1) Remove the catechin air filter (left one).

The air cleaning filter is not attached to

the right side catechin air filter.

Air cleaning filter

(Blue bellows type)

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MSZ-A24NA

MSY-A24NA

6. INDOOR UNIT STRUCTURAL PARTS

7. INDOOR UNIT HEAT EXCHANGER

(See 10-1.10.)

6. INDOOR UNIT STRUCTURAL PARTS

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

Symbol

in Wiring

Diagram

Q'ty/unit

No.

Part No.

Part Name

Remarks

MSZ-A24NA

MSY-A24NA

E02 527 970 INSTALLATION PLATE

E02 685 234 BOX

E02 888 000 FRONT PANEL ASSEMBLY

E02 408 142 CATCH

E02 685 067 SCREW CAP

E02 888 010 GRILLE

Including No.5,6

4 PC/SET

3 PC/SET

E02 534 100 CATECHIN AIR FILTER

E02 685 975 CORNER BOX (RIGHT)

1 PC/SET

-—

AIR CLEANING FILTER

MAC-2300FT

10 E02 888 007 LAMP PANEL

7. INDOOR UNIT HEAT EXCHANGER

11 E02 A58 620 INDOOR HEAT EXCHANGER

12 E02 527 666 UNION (GAS)

ø5/8

ø1/4

13 E02 151 667 UNION (LIQUID)

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MSZ-A24NA

MSY-A24NA

9. ACCESSORY AND

8. INDOOR UNIT FUNCTIONAL PARTS AND

ELECTRICAL PARTS

REMOTE CONTROLLER

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

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

Symbol

in Wiring

Diagram

Q'ty/unit

No.

Part No.

Part Name

Remarks

MSZ-A24NA

MSY-A24NA

E02 527 302 LINE FLOW FAN

E02 408 509 BEARING MOUNT

E02 001 504 SLEEVE BEARING

E02 408 702 DRAIN HOSE

E02 A58 235 NOZZLE

E02 685 040 VANE UPPER

E02 685 041 VANE LOWER

E02 527 034 VANE CRANK SET

E02 A58 300 INDOOR FAN MOTOR ASSEMBLY 1

MV2

MV1

RC0J56-□□

RIGHT & LEFT

UP & DOWN

10 E02 448 303 VANE MOTOR (VERTICAL)

11 E02 408 303 VANE MOTOR (HORIZONTAL)

12 E02 918 333 MOTOR BAND

13 E02 918 329 DISPLAY P.C. BOARD

14 E02 918 468 RECEIVER P.C. BOARD

E02 A58 452

ELECTRONIC CONTROL P.C. BOARD 2

E02 A53 452

16 E02 527 308 ROOM TEMPERATURE THERMISTOR

17 E02 A58 375 TERMINAL BLOCK

RT11

RT12,

RT13

18 E02 918 307 INDOOR COIL THERMISTOR

19 E02 528 034 VANE MOTOR SUPPORT SET(RIGHT)

20 E02 529 034 VANE MOTOR SUPPORT SET(LEFT)

1 Including FAN MOTOR RUBBER MOUNT

2 Including SW P.C. BOARD

9. ACCESSORY AND REMOTE CONTROLLER

E02 A58 426

KM06B

KM06D

REMOTE CONTROLLER

E02 A53 426

22 E02 527 083 REMOTE CONTROLLER HOLDER

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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)

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10-2. RoHS PARTS LIST (RoHS compliant)

MSZ-A09NA MSY-A15NA

MSZ-A12NA MSY-A17NA

MSZ-A15NA

MSZ-A17NA

1. INDOOR UNIT STRUCTURAL PARTS

2. ACCESSORY AND REMOTE

CONTROLLER

(See 10-2.5.)

1. INDOOR UNIT STRUCTURAL PARTS

Q'ty/unit

Symbol

MSZ-A

MSY-A

No.

Part No.

Part name

in Wiring

Diagram

Remarks

09NA 12NA 15NA 17NA 15NA 17NA

G E12 A32 234 BOX

Including

No.3,4

G E12 A49 000 PANEL ASSEMBLY

G E12 913 067 SCREW CAP

G E12 915 010 FRONT PANEL

2 2 PC/SET

CATECHIN AIR FILTER

G E12 915 100

(LEFT)

CATECHIN AIR FILTER

G E12 916 100

(RIGHT)

AIR CLEANING

—

1 MAC-415FT-E

FILTER

CORNER BOX

G E12 A32 975

(RIGHT)

G E12 913 970 INSTALLATION PLATE

10 G E12 A49 978 CONDUIT PLATE

2. ACCESSORY AND REMOTE CONTROLLER

G E12 A54 426

G E12 A49 426

G E12 C30 426

G E12 C22 426

KM06A

KM06C

1 KM07L

KM07J

REMOTE

CONTROLLER

REMOTE

12 G E12 527 083 CONTROLLER

HOLDER

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

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

Q'ty/unit

Symbol

in Wiring

Diagram

MSZ-A

MSY-A

No.

Part No.

Part name

Remarks

09NA 12NA 15NA 17NA 15NA 17NA

G E12 751 509 BEARING MOUNT

G E12 001 504 SLEEVE BEARING

G E12 897 702 DRAIN HOSE

G E12 A54 235

G E12 A56 235

G E12 897 303 VANE MOTOR UNIT (HORIZONTAL)

NOZZLE ASSEMBLY

1 UP & DOWN

G E12 913 040 HORIZONTAL VANE

POWER MONITOR RECEIVER

G E12 915 095

P.C. BOARD HOLDER

G E12 A49 979 CONDUIT COVER

G E12 C30 979 CONDUIT COVER

G E12 A49 780

G E12 C30 780

G E12 A49 779

G E12 C30 779

TERMINAL BLOCK

COVER

TERMINAL BLOCK

HOLDER

12 G E12 913 375 TERMINAL BLOCK

G E12 A54 452

G E12 A55 452

G E12 A56 452

G E12 A57 452

G E12 A51 452

G E12 A52 452

ELECTRONIC

CONTROL P.C.

BOARD 1

14 G E12 897 308 ROOM TEMPERATURE THERMISTOR RT11

G E12 A54 307

G E12 A56 307

INDOOR COIL

THERMISTOR

16 G E12 915 782 SWITCH HOLDER

17 G E12 A54 300 INDOOR FAN MOTOR

18 G E12 897 333 MOTOR BAND

19 G E12 897 302 LINE FLOW FAN

RT12,

RT13

1 RC0J30-□□

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

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

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

4. INDOOR UNIT HEAT EXCHANGER

Q'ty/unit

Symbol

MSZ-A

MSY-A

15NA 17NA

No.

Part No.

Part name

in Wiring

Diagram

Remarks

09NA

12NA

15NA

17NA

G E12 A54 620

G E12 A56 620

G E12 815 666

G E12 155 666

INDOOR HEAT

EXCHANGER

ø3/8

ø1/2

ø1/4

UNION (GAS)

G E12 151 667 UNION (LIQUID)

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

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

● Normal life of AIR CLEANING FILTER is 1 year.

If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm

water) and rinse it delicately, without removing the filter from the frame about once every 3 months.

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

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

Model

Part No.

MSZ-A09/12/15/17NA

MSY-A15/17NA

MAC-415FT-E

Replacement of the air cleaning filter

(2) Remove the air cleaning filter (Blue bel-

lows type) from the catechin air filter.

(1) Remove the catechin air filter (left one).

The air cleaning filter is not attached to

the right side catechin air filter.

Air cleaning filter

(Blue bellows type)

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MSZ-A24NA

MSY-A24NA

6. INDOOR UNIT STRUCTURAL PARTS

7. INDOOR UNIT HEAT EXCHANGER

(See 10-2.10.)

6. INDOOR UNIT STRUCTURAL PARTS

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

Q'ty/unit

Symbol

in Wiring

Diagram

MSZ-A24NA

MSY-A24NA

No.

Part No.

Part Name

Remarks

E12 527 970 INSTALLATION PLATE

E12 685 234 BOX

E12 888 000 FRONT PANEL ASSEMBLY

E12 408 142 CATCH

E12 685 067 SCREW CAP

E12 888 010 GRILLE

Including No.5,6

4 PC/ SET

3 PC/ SET

E12 534 100 CATECHIN AIR FILTER

E12 685 975 CORNER BOX (RIGHT)

1 PC/ SET

—

AIR CLEANING FILTER

MAC-2300FT

E12 888 007 LAMP PANEL

7. INDOOR UNIT HEAT EXCHANGER

E12 A58 620 INDOOR HEAT EXCHANGER

E12 527 666 UNION (GAS)

ø5/8

ø1/4

E12 151 667 UNION (LIQUID)

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MSZ-A24NA

MSY-A24NA

9. ACCESSORY AND

8. INDOOR UNIT FUNCTIONAL PARTS AND

ELECTRICAL PARTS

REMOTE CONTROLLER

8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS

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

Q'ty/unit

MSZ-A24NA MSY-A24NA

Symbol

in Wiring

Diagram

No.

Part No.

Part Name

Remarks

G E12 527 302 LINE FLOW FAN

G E12 408 509 BEARING MOUNT

G E12 001 504 SLEEVE BEARING

G E12 408 702 DRAIN HOSE

G E12 A58 235 NOZZLE

G E12 685 040 VANE UPPER

G E12 685 041 VANE LOWER

G E12 527 034 VANE CRANK SET

INDOOR FAN MOTOR

ASSEMBLY 1

G E12 A58 300

RC0J56-□□

10 G E12 448 303 VANE MOTOR (VERTICAL)

11 G E12 408 303 VANE MOTOR (HORIZONTAL)

12 G E12 918 333 MOTOR BAND

13 G E12 918 329 DISPLAY P.C. BOARD

14 G E12 918 468 RECEIVER P.C. BOARD

MV2

MV1

RIGHT & LEFT

UP & DOWN

G E12 A58 452

G E12 A53 452

ELECTRONIC CONTROL P.C.

BOARD 2

ROOM TEMPERATURE

THERMISTOR

16 G E12 527 308

RT11

17 G E12 A58 375 TERMINAL BLOCK

18 G E12 918 307 INDOOR COIL THERMISTOR

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

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

RT12, RT13

1 Including FAN MOTOR RUBBER MOUNT

2 Including SW P.C. BOARD

9. ACCESSORY AND REMOTE CONTROLLER

G E12 A58 426

G E12 A53 426

KM06B

KM06D

KM07K

KM07M

REMOTE CONTROLLER

G E12 C26 426

G E12 C29 426

22 G E12 527 083 REMOTE CONTROLLER HOLDER

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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)

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MICROPROCESSOR CONTROL

MSZ-A09NA MSZ-A17NA MSY-A15NA

MSZ-A12NA MSZ-A24NA MSY-A17NA

MSZ-A15NA

MSY-A24NA

WIRELESS REMOTE CONTROLLER

These pictures show MSZ-A24.

Signal transmitting section

(This diagram shows an overall view.)

Operation display section

ON/OFF (operate/

stop) button

VANE button

(Horizontal vane button)

Fan speed control button

Off-timer button

Temperature buttons

Operation select button

ECONO COOL button

On-timer button

WIDE VANE button

(Vertical vane button)

(MSZ-A24, MSY-A24)

TIME set buttons

Forward button

Backward button

Indication of

remote controller

model is on back

POWERFUL button

RESET button

CLOCK set button

NOTE

Use the remote controller

provided with the unit only.

Do not use other remote

controller.

(This diagram shows an overall view.)

Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP

(ON/OFF) button ON.

Indoor unit receives the signal with a beep tone.

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

restart for 3 minutes.

INDOOR UNIT DISPLAY SECTION

Operation Indicator lamp

The operation indicator at the right side of the indoor unit indicates the operation state.

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

Difference between

target temperature

Indication

Operation state

and room temperature

Lighted

This shows that the air conditioner is

operating to reach the target temperature.

Please wait until the target temperature is

obtained.

Blinking

Approx. 4°F or more

Approx. 4°F or less

—

Not lighted

This shows that the room temperature is

approaching the target temperature.

This shows a state of standby for operation.

(For multi system air conditioner)

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11-1. COOL ( ) OPERATION

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

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

(2) Select COOL mode with OPERATION SELECT button.

(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 61 ~ 88°F.

1. Coil frost prevention

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

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

heat exchanger rises.

2. Low outside temperature operation

When the outside temperature lowers during cool mode operation, low outside temperature operation starts, and the out-

door 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 tem-

perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.

2. High pressure protection

In HEAT operation the compressor operational frequency is controlled by the temperature of the indoor heat exchanger to

prevent the condensing pressure from increasing excessively.

3. Defrosting

Defrosting starts when the temperature of outdoor heat exchanger becomes too low.

The indoor/outdoor fans stop, the 4-way valve reverses, and the compressor starts.

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

11-4. FAN( )OPERATION (MSY)

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

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

(2) Select FAN mode with OPERATION SELECT button.

(3) Select the desired fan speed. When AUTO, it becomes Low.

Only indoor fan operates. Outdoor unit does not operate.

11-5. “I FEEL CONTROL” (

) OPERATION (MSY)

(1) Press OPERATE/STOP (ON/OFF) button on the remote

controller. OPERATION INDICATOR lamp of the indoor

unit turns on with a beep tone.

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

SELECT button.

Initial room temperature

75 °F or more

Mode

COOL mode of

"I FEEL CONTROL"

DRY mode of

"I FEEL CONTROL"

less than 75 °F

(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 starts.

) operation, mode is determined according to the room temperature at the set time the

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

Model

Initial room temperature

Initial set temperature

75°F

79 °F or more

COOL mode of

"I FEEL CONTROL"

77 °F to 79 °F

less than 77 °F

Initial room temperature minus 4 °F

DRY mode of

"I FEEL CONTROL"

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.

TOO

COOL

…

To raise the set temperature 2~4 °F

TOO

WARM

…

To lower the set temperature 2~4 °F

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

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

Mode selection

(1) Initial mode

When unit starts the operation with AUTO operation from off;

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

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

(2) Mode change

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

temperature.

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

temperature.

NOTE:

If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in

(AUTO), cannot change over to the other operating mode (COOL ↔ HEAT) and becomes a state of standby.

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

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11-7. AUTO VANE OPERATION

1. Horizontal vane

(1) Vane motor drive

These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of

the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.

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

MSZ-A09/12/15/17

MSY-A15/17

MSZ-A24

MSY-A24

(3) Positioning

The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.

Confirming of standard position is performed in the following cases.

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

(b) When the test run starts.

(4) VANE AUTO (

) mode

In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum

room-temperature distribution.

(1) COOL and DRY operation

(2) HEAT operation (MSZ)

Vane angle is fixed to Horizontal position or Angle 1.

Vane angle is fixed to Angle 4.

Upward

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

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

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

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

(6) Dew prevention

During COOL or DRY operation with the vane angle at Angle 2 ~ 4 (A09 ~ 17) / Angle 3 ~ 5 (A24) when the compressor

cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.

(7) SWING MODE (

)

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

displays “

”

(8) Cold air prevention in HEAT operation (MSZ)

The horizontal vane position is set to Upward.

NOTE : When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off,

this control doesn’t work in the indoor unit.

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

HEAT

(For MSZ)

To change the airﬂow direc-

When to use this function?

COOL/DRY

tion

Pressing and holding VANE Use this function if you don’ The air conditioner starts

CONTROL button for 2

The air conditioner starts heating

t want the air from the indoor the cooling or drying opera- operation approx. 3 minutes after

seconds or more cause the unit to blow directly onto your tion approx. 3 minutes after the vane has moved to the horizon-

horizontal vane to reverse

body.

the vane has moved to the

tal position.

and move to horizontal posi- • Depending on the shape of horizontal position.

• Sometimes the area around your

feet may not warm. To warm the

area around the feet, set the hori-

zontal vane to (AUTO) or the

downward-blowing position.

tion.

the room, the air may blow • When VANE CONTROL

directly onto your body.

button is pressed again,

the vane returns to the

previously-set position and

the air conditioner starts

• Press VANE CONTROL

button again to return the

vane to the previously-set

position.

Horizontal

position

the cool or dry operation in • When VANE CONTROL button is

approx. 3 minutes.

pressed again, the vane returns

to the previously-set position and

the air conditioner starts the heat

operation in approx. 3 minutes.

NOTE :

• If you make the airﬂow not to blow directly onto your body by pressing VANE CONTROL button, the compressor stops for 3

minutes even during the operation of the air conditioner.

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

(

10) ECONO COOL (

) operation (ECONOmical operation)

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

COOL mode.

Also the horizontal vane swings in various cycle.

SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that

in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved.

ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is

pressed or change to other operation mode.

(

11) POWERFUL ( ) operation

The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode.

The POWERFUL mode is automatically released 15 minutes after operation starts, and the operation mode returns to

the mode prior to POWERFUL operation.

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

(1) Vane motor drive

These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the

motor are controlled by pulse signals (approx. 12 V) transmitted from microprocessor.

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

SWING

(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.

(4) SWING MODE (

By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally.

The remote controller displays “ ”.

)

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(5) WIDE MODE (

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

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

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

)

Indoor fan speed becomes faster than setting fan speed on the remote controller even when

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 (

• Each time FORWARD button (

and

) to set the current time.

) is press, the set time increases by 1 minute, and each time BACKWARD button

(

) is press, the set time decreases by 1 minute.

• Pressing those buttons longer increases / decreases the set time by 10 minutes.

Press the CLOCK set button.

ON timer setting

(1) Press ON-TIMER button(

) during operation.

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

and

) .

OFF timer setting

(1) Press OFF-TIMER button (

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

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.

) during operation.

and

(

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 set-

ting is cancelled. As these models are equipped with an auto restart function, the air conditioner starts operating

with timer cancelled when power is restored.

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11-9. EMERGENCY/TEST OPERATION

In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor

unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote

controller run down. The unit will start and OPERATION INDICATOR lamp will light.

The first 30 minutes of operation is the test run operation. This operation is for servicing. The Indoor fan speed runs at

High speed and the system is in continuous operation (with thermostat ON).

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

The fan speed shifts to Med.

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

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

) mode.

Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any

signal from the remote controller. In case of latter normal operation will start.

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

Operation mode

Set temperature

Fan speed

COOL

75°F

Med.

Auto

HEAT (MSZ)

75°F

Med.

Horizontal vane

Auto

E.O.

The operation mode is indicated by the Operation

Indicator lamp as following

EMERGENCY OPERATION switch

MSZ type

EMERGENCY

COOL

Lighted

↓

Not lighted

EMERGENCY

HEAT

↓

STOP

MSY type

EMERGENCY

COOL

↓

STOP

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

MSZ-A•NA-

MSY-A•NA-

The preset unit is °F.

Press RESET button while

the temperature buttons

are pressed.

Press RESET button gently

using a thin stick.

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

Distributed in Jun. 2008. No. OB450 REVISED EDITION-C 6

Distributed in May 2007. No. OB450 REVISED EDITION-B 7

Distributed in Dec. 2006. No. OB450 REVISED EDITION-A 7

Distributed in Apr. 2006. No. OB450 7

New publication, effective Jun. 2008

Specifications subject to change without notice.

Made in Japan

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