Mitsubishi Electronics MSZ-FD35VAS, MSZ-FD35VA, MSZ-FD25VA User Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Wireless type Models

No. OBH488

MSZ-FD25VA -

MSZ-FD25VAS MSZ-FD35VA -

MSZ-FD35VAS -

Outdoor unit service manual MUZ-FD·VA Series(OBH489) MXZ-A·VA Series (OB377) MXZ-8A140A (OC316)

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················4

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

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS·························7

6. WIRING DIAGRAM ············································7

7. REFRIGERANT SYSTEM DIAGRAM················8

8. SERVICE FUNCTIONS ······································9

9. MICROPROCESSOR CONTROL ····················11

10. TROUBLESHOOTING ······································20

11. DISASSEMBLY INSTRUCTIONS·····················36

PARTS CATALOG (OBB488)

NOTE:

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

TECHNICAL CHANGES

MSZ-FD25VA - MSZ-FD25VAS MSZ-FD35VA - MSZ-FD35VAS -

1. New model

E1E1 E1E1

Air outlet

Vertical vane

Air filter

Front panel

Horizontal vane

Remote controller

AREA lamp indicate AREA setting

In AREA setting, the horizontal air flow direction changes automatically according to the detection of i-see Sensor which detects the floor/ wall temperature to air-condition the room evenly.

i-see control operation

i-see sensor constantly measure floor/wall temperature to automatically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room ("sensible temperature").

Operation Indicator lamp

Remote control receiving section

Emergency operation switch

Fan

Fan guard

i-see sensor

Heat exchanger

Air inlet

Plasma anti-allergy enzyme filter

Plasma electrode unit

Plasma deodorizing filter

AREA lamp

POWER lamp

CLEAN lamp PLASMA lamp

1 2 3 4 5 6 7

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

1 5 1 2 2 1 1

PART NAMES AND FUNCTIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

ACCESSORIES

MSZ-FD25VA MSZ-FD35VA

Single phase

230 V, 50 Hz

RCOJ40-GF

798O295O257

672

516/378/276

1,190

950/740/580

KM08A

Indoor model

Power supply

Power input ✽1

Running current ✽1

Fan motor current ✽1

Fan motor model Dimensions WOHOD Weight Color Air direction Air flow (Super High) Air flow (High/Med./Low) Sound level (Super High) Sound level (High/Med./Low) Fan speed (Super High) Fan speed (High/Med./Low) Fan speed regulator Remote controller model

K /h

dB(A)

rpm

Electrical

data

Special remarks

Cooling Heating Cooling Heating Cooling Heating

Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating Cooling Heating

MSZ-FD25VAS MSZ-FD35VAS

26 31

0.25

0.30

0.25

0.30

726

552/402/270

36/29/20

1,270

1,010/780/570

28 33

0.27

0.32

0.27

0.32

750

552/402/282

36/29/21

1,300

1,010/780/590

PURE WHITE SILVER PURE WHITE SILVER

250 V 3.15 A

MP20Z 12 VDC 300 " (at 25 ˚C) MSFBC20C29 12 VDC 350 " (at 25 ˚C) MSBPC20M11 12 VDC 300 " (at 25 ˚C)

S10K320E3K1

A2TPMI 23A FOV50 OBA060 P8L1 J4S

Fuse i-see Sensor motor Horizontal vane motor Vertical vane motor Varistor i-see Sensor Terminal block

(F11)

(MT) (MV1) (MV2)

(NR11)

(RR)

(TB)

SPECIFICATION

NOTE : Test conditions are based on ISO 5151

Cooling : Indoor Dry-bulb temperature 27 : Wet-bulb temperature 19 : Heating : Indoor Dry-bulb temperature 20 :

Specifications and rating conditions of main electric parts

Refrigerant piping length (one way): 5 m ✽1 Measured under rated operating frequency.

Outdoor Dry-bulb temperature 35 : Outdoor Dry-bulb temperature 7 : Wet-bulb temperature 6 :

INDOOR UNIT

WALL

MICROPHONE

0.8 m

1 m

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

Test conditions Cooling : Dry-bulb temperature 27 : Wet-bulb temperature 19 :

Heating : Dry-bulb temperature 20 :

43 43

NC-10

63 125 250 500 1000 2000 4000 8000

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

COOLING

FUNCTION

SPL(dB(A))

LINE

Super High

FAN SPEED

HEATING

NC-10

NOISE CRITERIA CURVES

MSZ-FD25VA MSZ-FD25VAS

MSZ-FD35VA MSZ-FD35VAS

225 225

155155

345

330 69

211.5

253

231.5

212.5

254

295

21.5

55 55688

100

785

798

6.5

Wall hole [65

11 X 26 Oblong hole

11 X 20 Oblong hole

Indoor unit

Installation plate

5257

Installation plate

Piping

Drain hose

Air in

Air out

159

Piping

Insulation

[35 O.D

Liquid line

[6.35 - 0.5 m (Flared connection [6.35)

Gas line

[9.52 - 0.43 m (Flared connection [9.52)

Drain hose

Insulation [28 O.D Connected part [16 O.D

OUTLINES AND DIMENSIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

Unit : mm

WIRING DIAGRAM

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

Indoor heat exchanger

Flared connection

Room temperature thermistor RT11

Flared connection

Refrigerant pipe [9.52 (with heat insulator)

Refrigerant pipe [6.35 (with heat insulator)

Indoor coil thermistor RT12 (main)

Indoor coil thermistor RT13 (sub)

Refrigerant flow in cooling Refrigerant flow in heating

REFRIGERANT SYSTEM DIAGRAM

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

Unit : mm

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

1 unit operation No modification

– – –

2 units operation

Same as at left

Solder J1

– –

3 units operation

Same as at left Same as at left

Solder J2

–

4 units operation

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

Solder both J1 and J2

SERVICE FUNCTIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

8-1. TIMER SHORT MODE

For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. (Refer to 10-7.) 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.)

8-2. 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 modification, put back the batteries then press

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.

the RESET button.

Table 1

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit 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 is turned OFF, or the power supply is shut down. Please conduct the above setting once again after the power has restored.

8-3. AUTO RESTART FUNCTION

8-4. REMOTE CONTROLLER

Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.

Area Left Center Right

Where is the indoor unit installed in your room?

NOTE:If the indoor unit is installed more than 50 cm away from the side walls, cabinets or other nearby objects, set the slide

switch to the “center” position.

(Left) (Center) (Right)

Slide swich

Position of

the slide

switch

Display on the remote

controller

Installed at left, if the distance is not more than 50 cm.

Installed at right, if the distance is not more than 50 cm.

Is the indoor unit installed at right, left or center?

JR07

CN151 CN211CN112 CN1R1

CN212

CN1T1

CN1U1

CN130

IC156

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. “AUTO RESTART FUNCTION” automatically starts operation in the same mode just before the shutoff of the main power.

Operation

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

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

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

How to release “AUTO RESTART FUNCTION”

Turn OFF the main power for the unit.

2Solder the Jumper wire to JR07 on the indoor electronic control

P.C. board. (Refer to 10-7.)

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 can-

celled.

• 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.

ON TIMER button

CLOCK SET button

TIME SET buttons FORWARD button BACKWARD button

OFF TIMER button

RESET button

VANE CONTROL button

WIDE VANE button

(Vertical vane button)

CLEAN button

AREA button

i-see button

Signal transmitting section

Operation display section

OPERATE/STOP (ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

Indication of remote controller model is on back

PLASMA button

Temperature buttons

MICROPROCESSOR CONTROL

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

WIRELESS REMOTE CONTROLLER

NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the

remote controller with beeps.

INDOOR UNIT LAMP

The lamps at the center of the indoor unit indicates the operation state.

Lamp

AREA

POWER

CLEAN

PLASMA

Operation state Refer to 9-7. Lamp lights during operation.

Lamp blinks in abnormal condition. Lamp lights during clean operation.

Refer to 9-9. Lamp lights during PLASMA operation.

Refer to 9-8.

9-1. COOL ( ) OPERATION

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

POWER 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 16 ~ 31 °C.

1. Coil frost prevention

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting. 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 is lower, low outside temperature operation starts, and the outdoor fan slows or stops.

9-2. DRY ( ) OPERATION

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

POWER 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. (9-1.1.)

2. Low outside temperature operation

Low outside temperature operation is as same as COOL mode. (9-1.2.)

9-3. HEAT ( ) OPERATION

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

POWER 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 16 ~ 31 °C.

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

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively. When the temperature of indoor heat exchanger becomes too high, the high pressure protection works. The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat exchanger falls.

3. Defrosting

Defrosting starts when the temperature of outdoor heat exchanger becomes too low. The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts. This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.

9-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION

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 2 °C below the set temperature. HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 °C above the set temperature.

NOTE 1

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 NOTE 2 “FOR MULTI SYSTEM AIR CONDITIONER”.

NOTE 2

Lighted Blinking Not lighted

AREA R POWER CLEAN PLASMAL

FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT : MXZ series

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

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

•When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few

minutes(max. 10 minutes) to blow out the warm air.

•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flow-

ing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

9-5. 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

To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected angle. Confirming of standard position is performed in the following cases: (a) The operation starts or finishes (including timer operation). (b) The test run operation starts. (c) Standby mode (only during multi system operation) starts or finishes.

(4) VANE AUTO ( ) mode

The microprocessor automatically determines the vane angle to make the optimum room temperature distribution.

COOL and DRY operation Vane angle is fixed to Angle 1.

(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 3 ~ 5 when the compressor cumulative operation time exceeds 1 hour or 30 minutes, the vane angle automatically changes to Angle 2 for dew prevention.

HEAT operation Vane angle is fixed to Angle 4.

To change the air

flow direction

When to use this function?

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

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

• Press VANE CONTROL button again to return the

vane to the previously-set position.

Pressing and holding VANE CONTROL button for 2 seconds or more cause the horizontal vane to reverse and move to horizontal 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.

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

• Sometimes the area around your feet may not warm. To warm the area around the feet, set the horizontal vane to (AUTO) or the downward blowing position.

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

COOL/DRY

HEAT

NOTE :

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

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

(9) To change the airflow direction not to blow directly onto your body.

Horizontal

position

(7) SWING ( ) mode

(SWING)

By selecting SWING mode with VANE CONTROLbutton, the horizontal vane swings vertically.

(8) Cold air prevention in HEAT operation

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.

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

When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2 °C higher. 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, 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 changed to other operation mode.

2. Vertical vane

(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.

(3) Positioning

To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected angle.

Confirming of standard position is performed in the following cases: (a) OPERATE/STOP(ON/OFF) button is pressed (POWER ON or OFF). (b) SWING is started. (c) The power supply turns ON.

(4) SWING( ) MODE

By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally. The remote controller displays “”. Swing mode is cancelled when WIDE MODE button is pressed once again.

9-6. i-see CONTROL OPERATION

(1) Press OPERATE / STOP (ON/ OFF) button to start the air conditioner. (2) Press i-see button. (NOTE1) (3) Press AREA button.

(4) AREA setting is cancelled when the "cancel" is selected by pressing AREA button, or when WIDE VANE button is pressed.

Each time the button is pressed, the area is changed in sequence:

NOTE1: AREA setting is only available during i-see control operation. NOTE2: If AREA setting is canceled, the vertical vane returns to the previously set position before AREA setting. NOTE3: The horizontal air flow direction (WIDE VANE button), including horizontal SWING, cannot be set during AREA setting.

(AUTO)

(LEFT) (RIGHT) Cancel

i-see Sensor moves intermittently, measuring the floor and wall temperature.

The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room (“sensory temperature”).

Advantages

· The air inside the room is conditioned quickly to a comfortable condition.

· The room will not become too cold or hot even when the air conditioner is kept on for a long period.

· The air conditioner will not overcool or overheat, which means you can save on electricity.

i-see control operation is activated when i-see button is pressed with a thin stick in manual COOL or manual HEAT mode.

NOTE : i-see control operation is activated when the remote controller is first used following replacement of the batter-

ies or resetting of the remote controller.

i-see control operation is cancelled when i-see button is pressed with a thin stick once again.

NOTE : If the conditioner is turned OFF without cancelling i-see control operation, i-see control operation is activated

the next time the air conditioner is turned ON.

i-see Sensor

i-see Sensor, which is installed on the upper of the air outlet of the indoor unit, is moved with the stepping motor and it

detects the floor/ wall temperature.

i-see Sensor is installed here.

Enlarged view of i-see Sensor

i-see Sensor

When AREA setting is not activated, the sensing range of i-see Sensor differs depending on the installation location of

the air conditioner.

Installation

position

Image of sensing

range

Direction of sensor

Refer to "Remote controller in SERVICE FUNCTIONS".

Installed at left Installed at center Installed at right

Right Center Left

· Install the front panel correctly after being removed for maintenance or service so that the floor/wall temperatures can

be measured correctly.

9-7. AREA ( ) SETTING

●Indoor unit installation location and air-conditioning area

Installed at left Installed at center Installed at right

LEFT RIGHT LEFT RIGHT LEFT RIGHT

To air-condition mainly the left area of the room

To air-condition the entire room The horizontal air flow direction and indoor unit display are switched according to the room temperature (floor/wall).

To air-condition mainly the right area of the room

Remote controller button

Press AREA button to select LEFT.

Press AREA button to select AUTO.

Press AREA button to select RIGHT.

i-see Sensor operation

Control range of horizontal air flow direction. The vertical air flow direction conforms to the setting on the remote controller. (The horizontal air flow direction is controlled in this range.)

Installed at center

Installed at left

Installed at right

Indoor unit display

AREA

Remote controller display

Lighted Not lighted

L R

L R L R L R L R

Ex.) In COOL mode

Moving of horizontal air flow direction

Indoor unit

display

NOTE

Indication of AREA setting

Lighted Not lighted

The horizontal air flow direction changes if i-see Sensor detects approx. 3 : temperature difference. In AUTO of AREA setting, both right and left lamps are lighted when the room is evenly air-conditioned.

AREA RL AREA RL

AREA RL

The indoor unit delivers cold air detecting the warm area in the room.

Daytime Nighttime

Warm area Cold area

Approx. 150 degrees

●When AREA is set to AUTO

•The vertical vane is controlled to maintain uniform temperature in the whole room.

•The i-see Sensor moves in a range of 150 degrees detecting floor/wall temperature of 3 areas

(left, right, center). Therefore, the detected temperatures may be different from the temperatures measured on commercial thermometers depending on the condition or temperature distribution on the floor and/or wall.

Operation and operating range

i-see sensor moves 30 degrees from the center in both right and left side.

i-see Sensor turning to the left

i-see Sensor operates as follows in accordance with AREAsetting made with the remote controller.

“AUTO” in AREAsetting; first turning to the LEFT for adjusting the position then.....

CENTER RIGHT CENTER LEFT CENTER......

(The sensor turns to the right, left and center.)

“RIGHT” in AREAsetting; first turning to the LEFT for adjusting the position then....

CENTER RIGHT CENTER RIGHT CENTER......

(The sensor turns to the right and center.)

“LEFT” in AREAsetting; first turning to the LEFT for adjusting the position then....

CENTER LEFT CENTER LEFT CENTER......

(The sensor turns to the left and center.)

The sensor finishes turning to one area to another for 3 seconds and it operates one area for 5 seconds.

i-see Sensor turning to the center

i-see Sensor turning to the right

9-8. PLASMA ( ) OPERATION

(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Press PLASMA button to set PLASMA operation. PLASMA lamp turns ON and plasma electrode unit is energyzed. (3) Press PLASMA button again to cancel PLASMA operation.

Description of PLASMA operation:

Plasma operation consists of deodorizing and air purifying features. Particles of odor-releasing substances are absorbed and decomposed by the plasma deodorizing filter. Particles of allergens such as pollens and house dust are collected by the plasma anti-allergy filter. These filters work with negative ions generated by the plasma electrode unit.

START

STOP

START

STOP

9-9. CLEAN ( ) OPERATION

• When CLEAN operation is set, it performs for 40 minutes when unit is stopped after COOL/DRY operation. CLEAN operation performs when: COOL is operated more than 3 minutes / DRY is operated more than 6 minutes.

• The horizontal vane is slightly opened and the fan is stopped for the first 15 minutes. then, the horizontal vane is set to higher than angle 1 and the fan is operaed for 25 minutes.

9-10. TIMER OPERATION

1. How to set the time

(1) 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

(a) Press the CLOCK set button. (b) Press the TIME SET buttons ( and ) to set the current time.

• Each time FORWARD button ( ) is pressed, the set time increases by 1minute, and each time BACK WARD button ( ) is pressed, the set time decreases by 1minute.

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

(c) Press the CLOCK set button. (2) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (3) Set the time of timer.

ON timer setting

(a) Press ON TIMER button( ) during operation. (b) Set the time of the timer using TIME SET buttons ( and ) .

OFF timer setting

(a) Press OFF TIMER button ( ) during operation. (b) Set the time of the timer using TIME SET buttons ( and ). w

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

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

2. To release the timer

To release ON timer, press ON TIMER button ( ). To release 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.

NOTE : If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-

celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer cancelled when power is restored.

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

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

9-11. EMERGENCY/TEST OPERATION

In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side 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 AREAlamp will light. The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High speed and thermostat is ON, but temperature control does not work. After 30 minutes of test run operation, the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of 24 °C. 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 COOL HEAT Set temperature Fan speed Horizontal vane Vertical vane

The operation mode is indicated by the AREA lamp as following

AREA lamp

EMERGENCY COOL

EMERGENCY HEAT

STOP

NOTE: This is the indication of EMERGENCY OPERATION mode. AREA setting is not available during EMERGENCY OPERATION.

24 : Med. Med.

Auto Auto

Straight Straight

AREALR

24 :

Lighted Not lighted

9-12. 3-MINUTE TIME DELAY OPERATION

When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect compressor from overload.

Housing point

RESET button

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

Lock

TROUBLESHOOTING

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

10-1. 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 main 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 P.C. board.

3) When removing the 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

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 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 10-2., 10-3. and 10-4.

4. How to replace batteries

Weak batteries may cause the remote controller malfunction. In this case, replace the batteries to operate the remote controller normally.

1 Remove the front lid and insert batteries.

Then reattach the front lid.

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.

5. How to install the horizontal vane

If horizontal vane is not installed correctly, all of the operation indicator lamps will blink. In this case, install the horizontal vane correctly by following the procedures 1 to 2.

NOTE : Before installation of the horizontal vane, turn OFF the power supply.

2 Press RESET button with tip end of ball point pen

or the like, and then use the remote controller.

In procedure 22lock the stoppers until they click into place.

10-2. FAILURE MODE RECALL FUNCTION

Operational procedure

Yes

(Blinks)

(OFF)

Yes

Releasing the failure mode recall function

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.

W2. Blinking pattern when the indoor unit is abnormal:

W3.Blinking pattern when the outdoor unit is abnormal:

OFF

Beeps

Repeated cycle Repeated cycle

OFF

No beep Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

2.5-second OFF 3-second ON

Blinking at 0.5second interval

Repeated cycle

Beeps

Does POWER 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 POWER lamp. W2

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

Setting up the failure mode recall function

Before blinking, does POWER lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal.

The indoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table(10-2.4.). Make sure to check at least two consecutive blinking cycles. W2

Turn ON the power supply. <

Preparation of the remote controller

1 While pressing both OPERATION SELECT button and TOO COOL button on the

remote controller at the same time, press RESET button.

2 First, release RESET button.

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

Deleting the memorized abnormal condition

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

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

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

with the remote controller headed towards the indoor unit.

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

mentioned above.

Repair the defective parts.

Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller.

Judgment of indoor/outdoor abnormality

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

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way. Confirm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function.

The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to outdoor unit service manual.) Make sure to check at least two consecutive blinking cycles. W3

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

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 (10-4.) 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

2. Flow chart of PLASMA operation failure mode recall function

Operational procedure

NOTE1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W2.Blinking pattern when plasma unit is abnormal:

Yes

(Blinks)

(OFF)

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

Does POWER lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: The plasma electrode unit is abnormal. Beep is emitted at the same timing as the blinking of POWER lamp. W2

Deleting the memorized abnormal condition

Repair the defective parts.

With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 23 :. W1

The plasma electrode unit is normal.

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.

The plasma electrode unit is abnormal. Check the blinking pattern, and refer to confirm the abnormal point with the PLASMA operation failure mode table (10-2.5.). Make sure to check at least two consecutive blinking cycles. W2

Release the failure mode recall function according to the left mentioned procedure.

Confirm that the remote controller is in the failure mode recall function.

The plasma electrode unit might be abnormal. Confirm if plasma electrode unit is abnormal according to the following procedures.

OFF

Beeps

Repeated cycle Repeated cycle

2.5-second OFF

Blinking at 0.5-

second interval

Beeps

Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

Beeps

1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. 2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.

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

mentioned above.

CorrespondencePLASMA lamp

Continuously blinking

2-time flash

Not lighted

Follow "Check of

PLASMA operation

" to identify the error.(Refer to 10-6.F)

There is failure in PLASMA operation

control circuit on the indoor electronic control

P.C. board.(Refer to 10-6.F) Normal

PLASMA operation goes ON when PLASMA button on the remote controller is pressed with any set temperature displayed during failure mode recall function.

3. PLASMA operation check

4. Indoor unit failure mode table

12-time flash

2.5-second OFF

Replace the indoor electronic control P.C. board.

Indoor control system

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

11-time flash

2.5-second OFF

Refer to 10-6.A "Check of indoor fan motor".

Indoor fan motor

The rotational frequency feedback signal is not sent out for 12-seconds after indoor fan motor is operated.

2-time flash

2.5-second OFF

Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (10-7.).

Indoor coil thermistor

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

3-time flash

2.5-second OFF

Refer to 10-6.D "How to check miswiring and serial signal error".

Serial signal

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

1-time flash every 0.5-second

Refer to the characteristics of the room temperature thermistor (10-7.).

Room temperature thermistor

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

Not lighted —Normal —

POWER

lamp

Correspondence

Abnormal point (Failure mode)

Condition

5-time flash

The voltage between CN1 3(+) and 2(GND) on the PLASMA POWER P.C board rises above the normal voltage value (3 V).

4-time flash

PLASMA DEODORIZING

The voltage between CN1 3(+) and 2(GND) on the PLASMA POWER P.C.board falls significantly. (0.4 V / 0.5 ms)

3-time flash

Refer to 10-6.F"Check of PLASMA operation".

Abnormal electric discharge error 1

The voltage between CN1 3(+) and 2(GND) on the PLASMA POWER P.C.board falls by

0.9 V below the normal voltage value (3 V).

2-time flash Spark discharge

1-time flash

PLASMA power supply control

The voltage between CN1 3(+) and 2(GND) on the PLASMA POWER P.C.board falls below 1.6 V(spark discharge judgment voltage).

PLASMA power supply cannot be turned OFF even if the PLASMA operation is turned OFF with the remote controller.

POWER lamp

Correspondence

Abnormal point (Failure mode)

Condition

Abnormal electric discharge error 2

Replace the indoor electronic control P.C.board.

NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).

5. PLASMA operation failure mode table

NOTE1 :Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.). NOTE2 :As soon as an abnormality is detected, PLASMA operation goes OFF, therefore measuring

instrument which records the voltage wave is required in order to perform the above mentioned voltage measurement.

NOTE3 :When POWER lamp flashes 1-time or 2-time, Please perform PLASMA operation check (Refer to 10-2.3).

Start

Indoor unit operates. Outdoor unit doesn't operate.

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

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

Outdoor unit operates only in Test Run operation. w

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

Indoor unit operates, when EMERGENCY OPERATION switch is pressed.

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

Check room temperature thermistor. Refer to 10-7. "Test point diagram and voltage".

Refer to "How to check inverter/ compressor".

Refer to 10-6.B "Check of remote controller and receiver P.C. board".

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

2. Refer to 10-6.C "Check of indoor electronic control P.C. board and indoor fan motor".

PLASMA lamp 2-time flash cause: Indoor unit

• Trouble of PLASMA operation

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

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

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

• Miswiring or trouble of serial signal

POWER lamp 2-time flash Cause: Indoor unit

• Trouble of room temp erature/ indoor coil thermistor

POWER lamp 3-time flash Cause: Indoor unit

• Trouble of indoor fan motor

POWER lamp 5-time flash Cause: Outdoor unit

• Outdoor power system abnormality

POWER lamp 6-time flash Cause: Outdoor unit

• Trouble of thermistor in outdoor unit

POWER lamp 7-time flash Cause: Outdoor unit

• Trouble of outdoor control system

Refer to 10-6. D "How to check of miswiring and serial signal error

All lamps Flash on and off at 0.5-second intervals Cause: Indoor unit

• The horizontal vane is not installed correctly.

Refer to 10-6. E "Check of installation of the horizontal vane".

Check room temperature thermistor and indoor coil thermistor. Refer to 10-7. "Test point diagram and voltage".

Refer to 10-6. A "Check of indoor fan motor".

Refer to "How to check inverter/ compressor".

Refer to "Check of outdoor thermistors".

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

POWER lamp 14-time flash Cause: Outdoor unit

• Other abnormality

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

POWER lamp 4-time flash Cause: Indoor unit

• Trouble of indoor unit control system

Replace the indoor electronic control P.C. board.

Refer to outdoor unit service manual.

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

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

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

Refer to 10-6.F"Check of PLASMA operation".

10-3. INSTRUCTION OF TROUBLESHOOTING

10-4. TROUBLESHOOTING CHECK TABLE

Lighted Blinking Not lighted

AREA R POWER CLEAN PLASMAL

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

Abnormal

No.

Miswiring or serial

signal

Indoor coil thermistor

Room temperature thermistor

Indoor fan

motor

Outdoor

power system

Outdoor

thermistors

Outdoor control

system

Other

abnormality

point

Indoor control system

POWER lamp flashes.

0.5-second ON

0.5-second OFF POWER lamp flashes.

2-time flash

2.5-second OFF POWER lamp flashes.

3-time flash

2.5-second OFF POWER lamp flashes.

4-time flash

POWER lamp flashes. 5-time flash

2.5-second OFF POWER lamp flashes.

6-time flash

2.5-second OFF

POWER lamp flashes. 7-time flash

POWER lamp flashes. 14-time flash

2.5-second OFF

SymptomOperation indicator lamp

Indoor unit and outdoor unit do not operate.

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

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

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

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

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

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

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

An abnormality other than above mentioned is detected.

Condition

Correspondence

• Refer to 10-6.D "How to check miswiring and serial signal error".

• Refer to 10-7.the

characteristics of indoor coil thermistor, and the room temperature thermistor.

• Refer to 10-6.A "Check of

indoor fan motor".

• Replace the indoor electronic

control P.C. board.

• Refer to "How to check of

inverter/compressor".

Refer to outdoor unit service manual.

• Check the stop valve.

• Refer to "Check of outdoor

thermistor".

Refer to outdoor unit service manual.

• Replace the inverter P.C.

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

• Check the stop valve.

• Confirm the abnormality in

detail using the failure mode recall function for outdoor unit.

Outdoor control system

POWER lamp lights up.

Outdoor unit does not operate.

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

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

AREA R POWER CLEAN PLASMAL

No.

SymptomOperation indicator lamp

Condition

Correspondence

Abnormal

point

0.5-second ON

0.5-second OFF

The electricity is not conducted to the interlock switch (Fan) of the horizontal vane.

• Refer to 10-6.E "Check of installation of the horizontal vane".

Indoor unit and outdoor unit do not operate.

Attachment of the horizontal vane

All lamps flash at the same time.

No.

SymptomOperation indicator lamp

Condition

Correspondence

Abnormal

point

MXZ type

Operation mode setting

Outdoor unit operates but indoor unit does not operate.

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

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

2.5-second OFF

POWER lamp is lighted. AREA lamps flash.

AREA R POWER CLEAN PLASMAL

No.

SymptomOperation indicator lamp

Condition

Correspondence

Abnormal

point

PLASMA lamp flashes. 2-time flash

2.5-second OFF

PLASMA operation can not be turned OFF even if the PLASMA operation is turned OFF with remote controller.

Indoor unit and outdoor unit do not operate.

PLASMA control

•Refer to 10-6.F"Check of PLASMA operation".

10-5. TROUBLE CRITERION OF MAIN PARTS

Part name FigureCheck method and criterion

Measure the resistance with a tester. Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control

P.C. board", the chart of thermistor.

Room temperature thermistor(RT11)

Indoor coil thermistor (RT12, RT13)

Horizontal vane motor(MV1)

Normal

BRN-other one

Measure the resistance between the terminals with a tester. (Part temperature 10 ~ 30 °C)

336 " ~ 364 "

Color of the lead wire

Vertical vane motor(MV2)

i-see Sensor motor(MT)

Normal

Measure the resistance between the terminals with a tester. (Part temperature 10 ~ 30 °C)

i-see Sensor(RR)

Cover the i-see Sensor with black vinyl tape. Then, turn ON the power supply. (i-see Sensor is energized.) Measure the voltage between connector terminals of i-see Sensor with a tester. (Part temperature 10 ~ 40 °C)

282 " ~ 306 "

Normal range

2(GND)

4(+)

1(+) - 2(GND)

1.874 ~ 3.387 VDC

1.010 ~ 1.420 VDC

i-see Sensor connector terminals

NOTE: Pay attention to static electricity.

Indoor fan motor(MF)

Check 10-6. A.

PLASMA electrode unit

Check 10-6. F

Color of the lead wire

BRN-other one

RED

YLW BRN

ORN

GRN

ROTOR

RED

YLW BRN

ORN

GRN

ROTOR

Cover the i-see Sensor with black vinyl tape.

i-see Sensor

i-see Sensor P.C. board

Black vinyl tape

connector

4 3 2(GND) 1

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

10-6. TROUBLESHOOTING FLOW

wIf more than 12 seconds passes after EMERGENCY OPERATION switch

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

Indoor electronic control P.C. board

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

Yes

No (Changed)

Yes (Unchanged)

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

Turn OFF the power supply.

Remove the foreign matter and adjust the line flow fan.

Turn ON the power supply, wait 5 seconds or more, and then press EMERGENCY OPERATION switch. Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed. If more than 12 seconds passes by, turn OFF the power supply and turn ON it again, then measure the voltage. w

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

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

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

Yes

Replace the indoor fan motor.

CN211

Replace the indoor electronic control P.C. board.

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

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

Is it unchanged holding 0 or 15 VDC?

Replace the indoor fan motor.

Replace the indoor electronic control P.C. board.

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

POWER lamp flashes 3-time. Indoor fan does not operate.

Check of indoor fan motor

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

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

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

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

Is LCD display on the remote controller visible?

Yes

Remove the batteries, then set them back

and press RESET button. (Refer to 10-

1.4.) Check if the unit operates with the remote controller.

Does the unit operate with the remote controller?

Yes

No (not clear)

Replace the batteries. (Refer to 10-1.4.)

Turn ON a radio to AM and press OPERATE/STOP(ON/OFF) button on the remote controller.

Is noise heard from radio?

Yes

Are there any fluorescent lights of

inverter or rapid-start type within the range of 1 m?

Replace the indoor electronic control P.C. board. (including the receiver)

Yes

Replace the remote controller.

● Reinstall the unit away from lights.

● Attach a filter on receiving part.

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

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

Turn OFF the power supply. Remove indoor fan motor connector CN211, vane motor connector CN151 and the i-see Sensor motor connector CN110 from the indoor electronic control P.C. board and turn ON the power supply.

Measure the resistance of the i-see Sensor motor coil. Refer to 10-5.

Short/open circuit: Replace the i-see Sensor motor and the indoor electronic control P.C. board.

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

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

Yes

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

Measure the resistance of the horizontal vane motor coil and the vertical vane motor coil. Refer to 10-5.

Replace the varistor(NR11) and fuse(F11).

Yes

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

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

Is the fuse(F11) blown only?

Yes

Measure the resistance between 1(+) and 3(-) of the indoor fan motor connector. w1,w2

Short/open circuit: Replace the indoor fan motor.

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

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

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

Is the resistance 1 M" or more?

Replace the fuse (F11).

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

Replace the indoor electronic control P.C. board.

Yes

Replace the fuse (F11) and the indoor fan motor.

Is the resistance approx. 4 "?

Yes

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

• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.

Is there rated voltage in the power supply?

Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire?

W1. Miswiring may damage indoor electronic control

P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts.

W3. Be sure to check this within 3 minutes after turning

ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C.board or the outdoor electronic control P.C.board is normal, LED blinks 6 times after 3 minutes. (Except for outdoor unit of multi system type)

(Lighted or not lighted)

Yes

W2 Be careful to the residual voltage of smoothing capacitor.

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

Yes

Turn OFF the power supply.

Turn ON the power supply.

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

Does AREA-L lamp light up? <Confirmation of the power to the indoor unit>

Press EMERGENCY OPERATION switch once.

Check the power supply.

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

Short-circuit outdoor terminal block S2 and S3. W1

Turn ON the power supply.

Check the wiring.

Correct them.

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>

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

Replace the indoor electronic control P.C. board.

Replace the inverter P.C. board or the outdoor electronic control P.C.board. W2

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

Replace the indoor/outdoor connecting wire.

Is serial signal error indicated 6 minutes later?

Yes

· Turn OFF inverter-controlled lighting equipment.

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

· Press EMERGENCY OPERATION switch.

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

· Attach a filter on remote control receiving section of the indoor unit.

Is serial signal error indicated 6 minutes later?

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

Indoor unit does not operate.

• POWER lamp flashes ON and OFF every 0.5-seconds. Outdoor unit does not operate.

How to check miswiring and serial signal error

Replace the indoor electronic control P.C. board.

Replace the interlock switch(Fan).

Is the stopper of the horizontal vane locked to the indoor unit correctly?

Yes

Is there resistance 0 "?

Relock the stopper of the horizontal vane to the indoor unit. (Refer to 10-1.5.)

Yes

Are all lamps flashing?

Yes

No(∞)

Turn ON the power supply.

To check the continuity of the interlock switch (Fan), measure the resistance of connector 1 - 2 connected to CN1R1 on the indoor electronic control P.C. board.

Turn OFF the power supply.

All lamps flash ON and OFF every 0.5-second.

After performing the check, make sure to release the failure mode recall function.

w2 Turn PLASMA operation OFF and ON again.

(For turning OFF PLASMA operation, refer to 10-2.3.) (If it goes normal without turning OFF and ON, PLASMA lamp doesn't go OFF.)

High voltage (approx. -4.4 kV) is generated during PLASMA operation. Pay careful attention and never touch PLASMA ELECTRODE UNIT and the high-voltage lead part (red wire).

Yes

OFF

PLASMA operation

Continuously blinking.

Does PLASMA lamp flash 2-time with unit stopping?

Turn ON the power supply.

Replace the indoor electronic control P.C. board.

1 While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. 2 First, release RESET button. And release the other two buttons after all LCD except the set

temperature in operation display section of the remote controller is displayed after 3 seconds.

3 Press OPERATE/STOP (ON/OFF) button (the set temperature

is displayed)

4 And press PLASMA button once with the remote controller

headed towards the indoor unit. w1 PLASMA operation is selected. wThe plasma operation check mode is set.(Refer to 10-2.5.)

Does PLASMA lamp stay OFF, or continuously blink?

Replace the PLASMA POWER P.C. board.

w1 Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Normal

Indoor unit and outdoor unit do not operate.

Check of installation of the horizontal vane

PLASMA lamp flashes 2-time. POWER lamp flashes 1 to 5 times while PLASMA operation failure mode (Refer to 10-2.5) is recalled.

Check of PLASMA operation

Electromagnetic noise enters into TV sets or radios

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

Yes

Is the distance between the antennas and the indoor unit within 3 m, or is the distance between the antennas and the outdoor unit within 3 m?

Is the distance between the TV sets or radios and the indoor unit within 1 m, or is the distance between the TV sets or radios and the outdoor unit within 3 m?

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

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

Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring). Check the followings before asking for service.

1.Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave)

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

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

4.Layout of ; indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring from antennas, receiver

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

6.Presence or absence of amplifier such as booster

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

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

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

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

4)Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.

Is the unit earthed?

Earth the unit.

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

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

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

10-7. TEST POINT DIAGRAM AND VOLTAGE

Room temperature thermistor (RT11) Indoor coil thermistor (RT12, RT13)

Temperature (:)

Resistance (k")

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

1. Indoor electronic control P.C. board.

Power supply input

SW P.C. Board

Emergency operation switch(SW1)

230 VAC

{

5 VDC

12 VDC

Cement resistor

(R111)

Indoor fan motor (CN211)

1325 VDC

3(-) Fiducial terminal of

cathode side on measuring high-voltage DC

415

VDC

5(+)3-6 VDC 6(+)0 or 15 VDC

Interlock switch(Fan) (CN1R1)

Room temperature thermistor RT11 (CN111)

Varistor (NR11)

CN2011 (Used for check of conducting of thermal fuse)

Indoor coil thermistor RT12, RT13 (CN112)

Plasma electrode unit (CN1T1)

(LD101)

1-3 : Connect to the monitor P.C.board 4-0 : Connect to the power monitor receiver

P.C.board

i-see Sensor (CN110)

Release of Auto restart function Solder the Jumper wire to JR07

(Refer to 8-3.)

Fuse (F11)

Horizontal vane(CN1U1)

Vertical vanes(CN151)

Timer short mode point JPG, JPS

}

(Refer to 8-1.)

2. Power monitor receiver P.C. board

3. Monitor P.C. board

4. Plasma power P.C. board

CN1

3DC 2.5 V during PLASMA

DEODORIZING operation

2GND 1DC 12.5 V during PLASMA

DEODORIZING operation

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

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

1Slide the sleeve. 2Pull the terminal while

pushing the locking lever.

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

The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching.

<"Terminal with locking mechanism" Detaching points>

Connector

Sleeve

Locking lever

DISASSEMBLY INSTRUCTIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS

NOTE :

Turn OFF power supply before disassembling.

OPERATING PROCEDURE

1. Removing the panel

(1) Press and unlock the knobs on both sides of the front

panel and lift the front panel until it is level. Pull the hinges

forward to remove the front panel. (2) Remove the horizontal vanes. (3) Remove the screw caps of the panel. Remove the screws.

(See Photo 1) (4) Hold the lower part of both ends of the panel and pull it

slightly toward you, and then remove the panel by pushing

it upward.

Photo 1

PHOTOS

Horizontal vane

Screws of the panel

Front panel

OPERATING PROCEDURE PHOTOS

2. Removing the electronic control P.C. board, the power monitor receiver P.C. board, i-see Sensor, SW P.C. board and the terminal block

(1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the screw of the V.A. clamp. Remove the V.A.

clamp and then the indoor/outdoor connecting wire. (See Photo 2)

(3) Remove the sensor holder from the electrical cover. (See

Photo 3)

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

electrical cover. (See Photo 3)

(5) Remove the earth wire connected to the indoor electronic

control P.C. board from the electrical box. (See Photo 3.)

(6) Remove the power monitor receiver P.C. board holder.

(See Photo 4.)

(7) Pull out the i-see Sensor from the power monitor receiver

P.C. board holder.

(w) Install the i-see Sensor in its former position when assem-

bling it.(Refer to Photo 5)

(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 sensor holder and pull out the 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. (11)

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

box. (12)

Remove the earth wire connected to the heat exchanger

from the electrical box. (See Photo 3) (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

the terminal block cover and the terminal block holder.

(See Photo 3) (15)

Remove the terminal block by sliding it.

Photo 2

Photo 3

Drain hose

Screws of the terminal block cover

Screw of the V.A. clamp

Earth wire

Sensor holder

Screw of the electrical cover

Sensor holder (inside)

Photo 4

i-see Sensor holder

Plasma power P.C. board holder

Power monitor receiver P.C. board holder

SW P.C. board

OPERATING PROCEDURE PHOTOS

3. Removing the electrical box

(1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the indoor/outdoor connecting wire, the sensor

holder, the electrical cover and the earth wire. (Refer to

2.)

(3) Disconnect the following connectors on the electronic con-

trol P.C. board; fan motor <CN211>, indoor coil thermistor <CN112>, vane motor <CN151>, interlock switch <CN1R1>, plasma power P.C. board <CN1T1>.

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

electrical box. (See Photo 3)

4. Removing the nozzle assembly

(1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the V.A. clamp, and then the indoor/outdoor con-

necting wire. (See Photo 2)

(3) Remove the sensor holder and the electrical cover. (See

Photo 3.)

(4) Disconnect the following connectors on the electronic con-

trol P.C. board; vane motor <CN151>, interlock switch<CN1R1>.

(5) Remove the power monitor receiver P.C. board holder and

the plasma power holder P.C. board holder. (See Photo 4)

(6) Pull out the drain hose from the nozzle assembly and

remove the nozzle assembly.

(7) Remove the interlock switch.

Photo 5

Be sure to assemble the i-see Sensor in the correct position

Photo 6

Interlock switch

Screws of the interlock switch

5. Removing the vertical vane motor unit

(1) Remove the nozzle assembly. (Refer to 4.) (2) Remove the crank of the vertical vane motor unit from the

arm of the vertical vane.

(3) Remove the screw of the vertical vane motor unit, and pull

the vertical vane motor unit. (4) Remove the screws of the vertical vane motor unit cover. (5) Remove the crank of the vertical vane motor unit from the

shaft of the vane motor. (w) Only the crank of the left side vertical vane motor unit.

(See Photo 7) (6) Remove the vertical vane motor from the the vertical vane

motor unit. (7) Disconnect the connector of vertical vane motor from the

vertical vane motor.

Photo 7

Screws of the vertical vane motor unit cover

Crank of the vertical vane motor unit

Photo 8

Screws of the vertical vane motor unit cover

Screw of the vertical vane motor unit

Crank of the vertical vane motor unit

Screw of the vertical vane motor unit

OPERATING PROCEDURE PHOTOS

6. Removing the horizontal vane motor

(1) Remove the nozzle assembly.(Refer to 4.) (2) Remove the screws of the horizontal vane motor unit, and

pull out the horizontal vane motor unit.

(4) Remove the screws of the horizontal vane motor unit

cover.

(5) Remove the horizontal vane motor from the horizontal

vane motor unit.

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

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

(1) Remove the panel (Refer to 1.) and the corner box. (2) Remove the sensor holder, the power monitor receiver P.C.

board holder, the electrical box (Refer to 3.) and the nozzle

assembly (Refer to 4.). (4) Remove the screws fixing the motor bed. (See Photo 10) (5) Loosen the screw fixing the line flow fan. (See Photo 11) (6) Remove the motor bed together with fan motor and motor

band. (7) Release the hooks of the motor band. Remove the motor

band. Pull out the indoor fan motor. (8) Remove the indoor coil thermistor from the heat exchang-

er. (w) Install the indoor coil thermistor (RT12) in its former posi-

tion when assembling it. (Refer to Photo 13) (9) Remove the screws fixing the left side of the heat

exchanger. (See Photo 12) (10)

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

lower-left.

Photo 9

Photo 10

Photo 11

Screws of the horizontal vane motor unit cover

Screws of the horizontal vane motor unit

Motor band

Screws of the motor bed

Photo 13

Screw of the line flow fan

Photo 12

Indoor coil thermistor (RT12)

Screws of the left side of the heat exchanger

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

New publication, effective Aug. 2007 Specifications subject to change without notice.

Mitsubishi Electronics MSZ-FD35VAS, MSZ-FD35VA, MSZ-FD25VA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual