Mitsubishi Mr.Slim MS-A09WA Service manual

Revision C:

• TEST POINT DIAGRAM AND VOLTAGE has

been corrected. (8-7)

Please void OB448 REVISED EDITION-B.

INDOOR UNIT

SERVICE MANUAL

No. OB448

REVISED EDITION-C

Models

MS-A09WA

MS-A09WA -

1

MS-A12WA

MS-A12WA -

1

Outdoor unit service manual

MU-A•WA Series (OB449)

NOTE:

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

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

LIST (RoHS compliant).

CONTENTS

1. TECHNICAL CHANGES ··································· 2

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

3. SPECIFICATION ················································ 5

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

5. WIRING DIAGRAM ············································ 7

6. REFRIGERANT SYSTEM DIAGRAM ··············· 7

7. SERVICE FUNCTIONS ····································· 8

8. TROUBLESHOOTING ······································· 9

9. DISASSEMBLY INSTRUCTIONS ···················· 21

10. PARTS LIST ····················································· 24

10-1. PARTS LIST ············································· 24

10-2. RoHS PARTS LIST ·································· 27

11. MICROPROCESSOR CONTROL ···················· 30

Revision A :

• MS-A•WA-

1

have been added.

Remote controller has been changed.

Revision B :

• SPECIFICATION has been corrected.

Powerful has been added. (Airflow ,Sound level)

Revision C:

• TEST POINT DIAGRAM AND VOLTAGE has been corrected. (8-7)

1 TECHNICAL CHANGES

MS12TN MS-A12WA

1.Indoor fan motor has been changed.

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

MS-A09WA MS-A09WA

-


-

1

1

1. Remote controller has been changed.

• Temperature indication function (°F/°C) has been added. (Refer to 11-8.)

Models Remote controller

MS-A09/12WA KM06C

MS-A09/12WA-

1

KM07L

Temperature indication

°F

°F/°C

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

2. Conduit plate has been removed.

3. Conduit cover, terminal block cover and terminal block holder have been changed.

2

2 PART NAMES AND FUNCTIONS

MS-A09WA

MS-A12WA

Heat exchanger

Panel

Air cleaning filter

(Anti-Allergy Enzyme

Filter, Blue bellows type)

Catechin air filter

Air outlet

Vertical vane

Horizontal vane

Line flow fan

Operation section

(When the front panel is opened)

Air inlet

Front panel

Remote controller

Display section

Operation Indicator lamp

Emergency operation switch Remote control receiving section

3

MS-A09WA

MS-A12WA

ACCESSORIES

Installation plate

Installation plate fi xing 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

MS-A09/12WA

1

2

2

1

8

1

1

1

MS-A09/12WA 1

1

2

2

1

5

1

1

—

4

3 SPECIFICATION

Model

Indoor unit model

External fi nish

Power supply V, phase, Hz

Max.-fuse size (time delay) /

Disconnect switch

Min. circuit ampacity

Fan motor

Airfl ow

Low–Med.–High–Powerful

Moisture removal

Sound level

Low–Med.–High–Powerful

A

A

F.L.A

COOL

Dry (Wet) CFM pt./h dB(A)

Cond. drain connection O.D. in.

Dimensions

Weight

Remote controller

W

D

H

Control voltage (by built-in transformer) in.

Ib.

MS-A09WA

MS-A09WA

183 - 261 - 335 - 367

(162 - 233 - 300 - 328)

2.7

26 - 32 - 40 - 42

White

115, 1, 60

15

1.2

0.95

5/8

30-11/16

8-1/4

11/-3/4

23

Wireless type

115 VAC

MS-A12WA

MS-A12WA

222 - 286 - 406 - 446

(198 - 254 - 363 - 399)

3.2

33 - 38 - 45 - 47

NOTE : Test conditions are based on ARI 210/240

1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB) Rated frequency : 60Hz

Operating Range

Cooling

Indoor intake air temperature Outdoor intake air temperature

Maximum 95˚FDB, 71˚FWB 115˚FDB

Minimum 67˚FDB, 57˚FWB 67˚FDB

5

4 OUTLINES AND DIMENSIONS

MS-A09WA

MS-A12WA

Conduit plate(MS-A•WA- is excluded.)

7/16x1 Oblong hole 7/16x13/16 Oblong hole

Installation plate 2-3/16 8-7/8 8-7/8 2-3/16

7/8 hole

Unit : inch

30-11/16

2-1/8

2-5/16

24-9/16

3/4

4

Indoor unit

2-3/16

6-1/8 6-1/8

13-3/16

1-3/4

12-5/8

Air in

2-3/4

Wall hole 2-9/16

Air out

8-1/4 3/16

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)

Insulation 1-1/8

6

5 WIRING DIAGRAM

MS-A09WA

MS-A12WA

6 REFRIGERANT SYSTEM DIAGRAM

MS-A09WA

MS-A12WA

Indoor heat exchanger

Refrigerant pipe 3/8 (MS-A09)

1/2 (MS-A12)

(with heat insulator)

Indoor coil thermistor

RT12

Flared connection

Unit : inch

Room temperature thermistor

RT11

Flared connection

Refrigerant flow in cooling

Refrigerant pipe 1/4

(with heat insulator)

7

7 SERVICE FUNCTIONS

MS-A09WA

MS-A12WA

7-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS the 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.

J1 J2

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

No. 1 unit

No. 2 unit

No. 3 unit

No. 4 unit

1 unit operation

No modifi cation

—

—

—

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

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.

8

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 for the unit.

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

JR07

BZ

NOTE:

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

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

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

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

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

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

8 TROUBLESHOOTING


8-1. CAUTIONS ON TROUBLESHOOTING

1. Before troubleshooting, check the following

1) Check the power supply voltage.

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

2. Take care of the following during servicing

1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.

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

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

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

Lead wiring Housing point

9

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

4) 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.

10

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.

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

Operational procedure

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

Setting up the failure mode recall function

Turn ON the power supply.

<Preparation of the remote controller>

While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.

First, release RESET button.

And release the other two buttons after all LCD except the set temperature 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

Does the left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds?

Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. 2

No

(OFF)

Yes

(Blinks)

The indoor unit is abnormal.

Check the blinking pattern, and confi rm the abnormal point with the indoor unit failure mode table. (8-2.2.)

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

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

Indoor unit is normal.

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

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:

2.5-second OFF

Blinking at 0.5second interval 2.5-second OFF

Blinking at 0.5second interval

ON

OFF

Beeps

Repeated cycle

Beeps

Repeated cycle

Beeps

Repeated cycle

11

2. Indoor unit failure mode table

Left lamp of OPERATION

INDICATOR lamp

Not lighted

1-time fl ash every

0.5-second

2-time fl ash

2.5-second OFF

11-time fl ash

2.5-second OFF

12-time fl ash

2.5-second OFF

Abnormal point

(Failure mode)

Normal


—

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


Indoor fan motor

Condition Correspondence

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

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

—

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

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

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

Indoor control system

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

Replace the indoor electronic control P.C. board.

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

12

8-3. INSTRUCTION OF TROUBLESHOOTING

Start

Indoor unit operates.

Outdoor unit doesn't operate.

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

Outdoor unit operates only in Test Run operation.

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

Indoor unit operates, when

EMERGENCY

OPERATION switch is pressed.

OPERATION INDICATOR lamp on the indoor unit is fl ashing on and off.

Indoor unit doesn't operate, when EMER-

GENCY OPERA-

TION switch is pressed.

If blinking of OPERATION INDI-

CATOR lamp cannot be checked, it can be checked with failure mode recall function.

"Test Run operation" means the operation within 30 minutes after EMERGENCY OPERA-

TION switch is pressed.

Check room temperature thermistor.

Refer to 8-7.

"Test point diagram and voltage".

• Check the wiring diagram of the outdoor unit.

• Check outdoor fuse.

Refer to 8-6.

"Check of remote controller and receiver P.C. board".

1. Check indoor/outdoor connecting wire.

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

Left lamp

2-time fl ash

Cause:

Indoor unit

• Trouble of room temperature / indoor coil thermistor

Left lamp

3-time fl ash

Cause:

Indoor unit

• Trouble of indoor fan motor

Left lamp

4-time fl ash

Cause:

Indoor unit

• Trouble of indoor unit control system

Check room temperature thermistor and indoor coil thermistor. Refer to

8-7. "Test point diagram and voltage".

Refer to 8-6.

"Check of indoor fan motor".


13

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

Operation indicator lamp

1

2



Left lamp fl ashes.

2-time fl ash

2.5-second OFF

Indoor fan motor

Left lamp fl ashes.

3-time fl ash

2.5-second OFF

3

Indoor control system

Left lamp fl ashes.

4-time fl ash

2.5-second OFF

Symptom Condition

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

• Refer to the characteristics of indoor coil thermistor, and the room temperature thermistor

(8-7).

Indoor unit and outdoor unit do not operate.

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

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

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

•

Correspondence


14

8-5. TROUBLE CRITERION OF MAIN PARTS


Part name Check method and criterion


(RT11) Measure the resistance with a tester. (Part temperature 50 ~ 86°F)


(RT12)

Refer to 8-7. "Test point diagram and voltage", the chart of thermistor.

Indoor fan motor

(MF)

Check 8-6. .

Horizontal vane motor

(MV)

Measure the resistance between the terminals with a tester.

(Part temperature 50 ~ 86°F)

Color of the lead wire Normal

BRN - other one 235 ~ 255 Ω

Figure

RED

YLW

BRN

ROTOR

ORN GRN

15

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.

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

No

Yes

Remove the foreign matter and adjust the line fl ow fan.

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.

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 (-).

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

Is there 162 VDC between CN211

(+) and (-), and does the voltage between CN211 (+) and (-) rise to the range of 3 to 6 VDC within 12 seconds after EMERGENCY OPERA-

TION switch is pressed?

No

Yes

Replace the indoor fan motor.

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.

CN211

Measure the voltage between CN211

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

Is it unchanged holding

0 or 15 VDC?

Yes

(Unchanged)


No

(Changed)


16

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

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

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

Is LCD display on the remote controller visible?

Yes

No

(Not clear)

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

Remove the batteries, then set them back and press RESET button. (Refer to 8-1.4.)

Check if the unit operates with the remote controller.

Does the unit operate with the remote controller?

Yes

OK

No

Turn ON a radio to AM and press OP-

ERATE/STOP (ON/OFF) button on the remote controller.

Is noise heard from radio?

Yes

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

No

No

Yes

Replace the remote controller.

•

•

Reinstall the unit away from lights.

Attach a fi lter on receiving part.

Replace the indoor electronic control

P.C. board. (Including the receiver)

17

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


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

OPERATION switch?

No

Measure the resistance between

CN211 and of the indoor fan motor connector.

Measure the resistance of the horizontal vane motor coil.

(Refer to 8-5.)

Short/open circuit:


Short/open circuit:

Replace the horizontal vane motor and the indoor electronic control P.C. board.


Check both “parts side” and “pattern side” of the indoor electronic control

P.C. board visually.


Yes

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

No

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

Is the fuse (F11) blown only?

Yes

No

Measure the resistance between

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

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

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

Is the resistance 1 MΩ or more?

Yes

No

Replace indoor electronic control

P.C. board.

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

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

Is the resistance approx.

2 Ω?

Yes

No

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


Indoor electronic control P.C.Board

Varistor(NR11)

Fuse(F11)

CN211

18

D Electromagnetic noise enters into TV sets or radios

Is the unit grounded?

Yes

No

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.?

Yes

No

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

No

Yes

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

Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit.

Are the antennas damaged?

Is the coaxial cable damaged?

Is there any poor contact in the antenna wiring?

No

Yes

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

Yes

No

Replace or repair the antenna.

Replace or repair the coaxial cable.

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

Even if all of the above conditions are fulfi lled, the electromagnetic noise may enter, depending on the electric fi eld strength or the installation condition (combination of specifi c conditions such as antennas or wiring).

Check the followings before asking for service.

1. Devices affected by the electromagnetic noise

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

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

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

4. Layout of ;

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

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

6. Presence or absence of amplifi er such as booster

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

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

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

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

19

8-7. TEST POINT DIAGRAM AND VOLTAGE


Indoor electronic control P.C. board

Varistor (NR11)

Resistor

(R111)

Power supply input

115 VAC Fuse (F11)

250 V 3.15 A

Release of Auto restart function

Solder the Jumper wire to JR07

(Refer to 7-3.)

Indoor fan motor

(CN211)

162 VDC

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

15 VDC

(+)3-6 VDC

(+)0 or 15 VDC

Power monitor receiver P.C. board

5 VDC


RT12

(CN112)

Horizontal vane motor (CN151)

Room temperature thermistor (RT11)

}

Timer short mode point JPG, JPS

(Refer to 7-1.)

12 VDC

Indoor coil thermistor [RT12]

Room temperature thermistor (RT11)

Emergency operation switch SW P.C. board

32 50 68 86 104 122 140

Temperature (°F)

20

9 DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

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

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

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

Check the shape of the terminal before detaching.

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

(2) The terminal with this connector has the

locking mechanism.

Sleeve

Locking lever

Slide the sleeve.

Pull the terminal while pushing the locking lever.

Hold the sleeve, and pull out the terminal slowly.

Connector


OPERATING PROCEDURE

1. Removing the panel

(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 1

PHOTOS

Photo 3

MS-A09/12WA -

1

Horizontal vane

Screw of the conduit cover

Terminal block cover

Conduit cover

Photo 2

Screws of the panel

Terminal block cover

Conduit cover

Screw of the conduit cover

Conduit plate

MS-A09/12WA

21


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.

(Photo 2 or Photo 3)

(3) Remove the indoor/outdoor connecting wire.

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

4)

(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.

(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, TAB4 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. (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)

(15) Remove the terminal block by sliding it.

Photo 4

Photo 5

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 exchanger from the electrical box. (Photo 5)

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

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

Photo 6

Screw

22

PHOTOS

Switch holder

Screw of the electrical cover.

Power monitor receiver

P.C. board holder

Ground wire

Indoor fan motor connector (CN211)

Indoor coil thermistor connector (CN112)

Vane motor connector (CN151)


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. (Photo 7)

(3) Disconnect the connector from the horizontal vane motor unit.

Photo 7

PHOTOS

Screws of 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) Pull out 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 exchanger. (Photo 10)

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

Photo 8

Screws of the motor bed

Photo 9

Screw of the line flow fan

Motor band

Photo 10

Screws of the left side of the heat exchanger

23

10 PARTS LIST

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

MS-A09WA

MS-A12WA

1. INDOOR UNIT STRUCTURAL PARTS

1

2. ACCESSORY AND REMOTE

CONTROLLER

9

10

8

7

(See 10-1.5.)

11 12

2

3

4

5 6


No. Part No. Part name

1 E02 A32 234 BOX

2 E02 A49 000 PANEL ASSEMBLY

3 E02 913 067 SCREW CAP

4 E02 915 010 FRONT PANEL

5 E02 915 100 CATECHIN AIR FILTER (LEFT)

6 E02 916 100 CATECHIN AIR FILTER (RIGHT)

7 — AIR CLEANING FILTER

8 E02 A32 975 CORNER BOX (RIGHT)

9 E02 913 970 INSTALLATION PLATE

10 E02 A49 978 CONDUIT PLATE

Symbol in Wiring

Diagram

2. ACCESSORY AND REMOTE CONTROLLER

11 E02 A49 426 REMOTE CONTROLLER

12 E02 527 083 REMOTE CONTROLLER HOLDER

Q'ty/unit


Remarks

1

1

1

1

1

1

2

1

1

1

1

1

1

1

1

1

2

1

1

1

Including No.3,4

2 PC/SET

MAC-415FT-E

1

1

1

1

KM06C

24

MS-A09WA

MS-A12WA

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

18 17 16 15 14

3

4

5

2

1

6

7

11

10

9

8 12

13



Diagram

Q'ty/unit


1 E02 751 509 BEARING MOUNT

2 E02 001 504 SLEEVE BEARING

3 E02 897 702 DRAIN HOSE

4 E02 A49 235 NOZZLE ASSEMBLY

5 E02 897 303 VANE MOTOR UNIT (HORIZONTAL)

6 E02 913 040 HORIZONTAL VANE

MV

1

1

1

1

1

1

BOARD HOLDER

8 E02 A49 979 CONDUIT COVER

9 E02 A49 780 TERMINAL BLOCK COVER

10 E02 A49 779 TERMINAL BLOCK HOLDER

11 E02 A49 375 TERMINAL BLOCK TB

12

E02 A49 452 ELECTRONIC CONTROL P.C. BOARD

E02 A50 452 1

13 E02 897 308 ROOM TEMPERATURE THERMISTOR RT11

14 E02 897 307 INDOOR COIL THERMISTOR RT12

1

1

1

1

1

1

1

1

15 E02 915 782 SWITCH HOLDER

17 E02 897 333 MOTOR BAND

18 E02 897 302 LINE FLOW FAN

1

16 E02 A49 300 INDOOR FAN MOTOR 2 MF

1

1

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

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

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Remarks

UP & DOWN

RC0H30-

□□

25

MS-A09WA

MS-A12WA

4. INDOOR UNIT HEAT EXCHANGER

1

2

3


1

2

E02 A49 620

E02 A50 620

E02 151 666

E02 155 666

INDOOR HEAT EXCHANGER

UNION (GAS)

3 E02 151 667 UNION (LIQUID)


Diagram

Q'ty/unit


Remarks

1

1

1

1

1

1

ø3/8

ø1/2

ø1/4

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

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

● Normal life of AIR CLEANING FILTER is 1 year.

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

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

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

Model

MS-A09WA

MS-A12WA

Part No.

MAC-415FT-E

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.


(Blue bellows type)

26

2

3

4

10-2. RoHS PARTS LIST (RoHS compliant)

MS-A09WA

MS-A12WA


1

2. ACCESSORY AND REMOTE

CONTROLLER

9

10

8

7

(See 10-2.5.)

11 12

5 6



1 G E12

2 G E12 A49 000 PANEL ASSEMBLY

3 G E12 913 067 SCREW CAP

4 G E12 915 010 FRONT PANEL

5 G E12 915 100 CATECHIN AIR FILTER (LEFT)

6 G E12 916 100 CATECHIN AIR FILTER (RIGHT)

7 G — AIR CLEANING FILTER

8 G E12 A32 975 CORNER BOX (RIGHT)

9 G E12 913 970 INSTALLATION PLATE

10 G E12 A49 978 CONDUIT PLATE

2. ACCESSORY AND REMOTE CONTROLLER

11

G E12

G E12 C30 426

12 G E12 527 083 REMOTE CONTROLLER HOLDER


Diagram

Q'ty/unit


1

1

2

1

1

1

1

1

1

1

-

1

1

1

2

1

1

1

1

1

1

1

1

2

1

1

1

1

1

1

1

-

1

1

2

1

1

1

1

1

1

1

Remarks

Including No.3,4

2 PC/SET

MAC-415FT-E

1

1

1

1

1

1

KM06C

1 KM07L

1

27

MS-A09WA

MS-A12WA

3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS

19 18 17 16 15

3

4

2

5

1

6

7

12

11

10

8 9 13 14

No.

5

6

7 G E12 915 095 POWER MONITOR RECEIVER P.C.

8 G E12 A49 979 CONDUIT COVER

9 G E12 C30 979 CONDUIT COVER

10

11

Part No.

3 G E12 897 702 DRAIN HOSE

G E12 A49 780

G E12 C30 780

G E12 A49 779

G E12 C30 779

Part name

1 G E12 751 509 BEARING MOUNT

2 G E12 001 504 SLEEVE BEARING

4 G E12 A49 235 NOZZLE ASSEMBLY

G E12 897 303 VANE MOTOR UNIT (HORIZONTAL)

G E12 913 040 HORIZONTAL VANE

TERMINAL BLOCK COVER

TERMINAL BLOCK HOLDER

12 G E12 A49 375 TERMINAL BLOCK

13

G E12 A49 452 ELECTRONIC CONTROL P.C.

G E12 A50 452 BOARD 1


Diagram

MV

TB

Q'ty/unit


1

1

1

1

1

1

- 1

1

1

1

1

1

1

1

1

1

1

1

1

-

1

1

1

1

1

1

1

Remarks

UP & DOWN

1

1

1 1

1

1

1 1

1 1

1 1

1 1

1

1

1

1

1

1

1

1

RT11 1 1

1

1

1

1

15 G E12 897 307 INDOOR COIL THERMISTOR

16 G E12 915 782 SWITCH HOLDER

17 G E12 A49 300 INDOOR FAN MOTOR 2

18 G E12 897 333 MOTOR BAND

19 G E12 897 302 LINE FLOW FAN

RT12

MF

1

1

1

1

1

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

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

1

1

1

1

1

1

1

1

1

1

1

1

1 RC0H30-

□□

1

1

28

MS-A09WA

MS-A12WA

4. INDOOR UNIT HEAT EXCHANGER

1

2

3


1

2

G E12 A49 620

G E12 A50 620

G E12 151 666

G E12 155 666

INDOOR HEAT EXCHANGER

UNION (GAS)

3 G E12 151 667 UNION (LIQUID)


Diagram

Q'ty/unit


1

-

1

1

-

1

1 1

1 1

1 1

1

1

1

1

Remarks

ø3/8

ø1/2

ø1/4

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

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

● Normal life of AIR CLEANING FILTER is 1 year.

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

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

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

Model

MS-A09WA

MS-A12WA

Part No.

MAC-415FT-E

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.


(Blue bellows type)

29

11 MICROPROCESSOR CONTROL

MS-A09WA

MS-A12WA

WIRELESS REMOTE CONTROLLER

Signal transmitting section

Operation display section

ON/OFF (operate/ stop) button

Temperature buttons

VANE button

(Horizontal vane button)

Operation select button

ECONO COOL button

Indication of remote controller model is on back

NOTE

Use the remote controller provided with the unit only.

Do not use other remote controller.

POWERFUL button

RESET button

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


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

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

Indication Operation state

Difference between target temperature and room temperature

This shows that the air conditioner is operating to reach the target temperature.

Please wait until the target temperature is obtained.

Approx. 4°F or more

Lighted

Blinking

Not lighted

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

Approx. 4°F or less

30

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 forest 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


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. FAN ( ) OPERATION


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.

11-4. “I FEEL CONTROL” ( ) OPERATION

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

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

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

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

• Under the ON-TIMER ( ation.

) operation, mode is determined according to the room temperature at the start-up of oper-

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

Model Initial room temperature

79°F or more

77 to 79°F

Less than 77°F

COOL mode of "I FEEL CONTROL"

DRY mode of "I FEEL CONTROL"

Initial set temperature

75°F

Initial room temperature minus 4°F

Initial room temperature minus 4°F

31

(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

11-5. 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.

(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.

In COOL, DRY and FAN operation

Vane angle is fixed to Horizontal position.

Upward

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

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

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

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

(c) When ON-TIMER is ON standby.

(6) Dew prevention

During COOL or DRY operation with the vane angle at Angle 2 ~ 4 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 “ ”.

32

(8) To change the airfl ow direction not to blow directly onto your body.

To change the airfl ow direction

Pressing and holding VANE

CONTROL button for 2 seconds or more, the horizontal vane reverses and moves horizontal position.

Horizontal position

When to use this function?

COOL/DRY

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.

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

NOTE : • If you make the airfl ow 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) 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. Plessing VANE CONTROL button or POWERFUL button, or changing to other operation mode also cancels ECONO COOL operation.

(10) 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.

33

11-6. TIMER OPERATION

1. How to set the timer

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

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

NOTE : Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of

TIME MONITOR, so set the current time correctly with CLOCK SET button.

How to set the current time

(1) Press the CLOCK set button.

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

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

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

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

Press the CLOCK set button.

ON timer setting

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

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

OFF timer setting

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

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

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

( ) is pressed, the set time decreases by 10 minutes.

2. Cancel

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

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

TIMER is cancelled and the display of set time disappears.

PROGRAM TIMER

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

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

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

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

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

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

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

34

11-7. 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 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

E.O.

SW

Operation mode

Set temperature

Fan speed

Horizontal vane

COOL

75°F

Med.

Auto

The operation mode is indicated by the

Operation Indicator lamp as following


EMERGENCY COOL

Lighted

STOP

11-8. CHANGING TEMPERATURE INDICATION (°F/°C)

MS-A•WA-

1

The preset unit is °F.

Press RESET button while the temperature buttons are pressed.

Press RESET button gently using a thin stick.

35

TM

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

Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD

Distributed in Oct. 2008. No. OB448 REVISED EDITION-C 5

Distributed in Jun. 2008. No. OB448 REVISED EDITION-B 6

Distributed in May 2007. No. OB448 REVISED EDITION-A 7

Distributed in Mar. 2006. No. OB448 7

Made in Japan

New publication, effective Oct. 2008

Specifications subject to change without notice.

Mitsubishi Mr.Slim MS-A09WA Service manual

INDOOR UNIT

No. OB448

Models

1 TECHNICAL CHANGES

2 PART NAMES AND FUNCTIONS

3 SPECIFICATION

Operating Range

4 OUTLINES AND DIMENSIONS

5 WIRING DIAGRAM

6 REFRIGERANT SYSTEM DIAGRAM

7 SERVICE FUNCTIONS

8 TROUBLESHOOTING

9 DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

10 PARTS LIST

11 MICROPROCESSOR CONTROL

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