Mitsubishi MSZ-FD50VA-E1, MUZ-FD50VA-E1 user guide manual

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SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models

Revision C:

• MSZ-FD•VA(S)- E2 has been added.

Please void OBH488 REVISED EDITION-B.

No. OBH488

REVISED EDITION-C

MSZ-FD25VA -

E1,E2

MSZ-FD25VAS MSZ-FD35VA -

E1,E2

MSZ-FD35VAS MSZ-FD50VA -

E1,E2

MSZ-FD50VAS -

E1,E2

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

Outdoor unit service manual MUZ-FD·VA(H) Series (OBH489) MUZ-FD·VABH Series (OBH519) MXZ-A·VA Series (OB377) MXZ-8A140A (OC316)

NOTE:

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

PARTS CATALOG (OBB488)

Revision A:

• 3. SPECIFICATION has been corrected.

• 10-5. TROUBLE CRITERION OF MAIN PARTS has been corrected.

Revision B:

• MSZ-FD50VA(S)- E1 has been added.

Revision C:

• MSZ-FD•VA(S)- E2 has been added.

TECHNICAL CHANGES

MSZ-FD25VA MSZ-FD35VA MSZ-FD50VA -

1. New model

MSZ-FD25VA(S) MSZ-FD35VA(S) MSZ-FD50VA(S) -

1. Remote controller has been changed. (KM08A → KM09D)

MSZ-FD25VAS -

MSZ-FD35VAS -

MSZ-FD50VAS -

→ MSZ-FD25VA(S) -

→ MSZ-FD35VA(S) -

→ MSZ-FD50VA(S) -

PART NAMES AND FUNCTIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

AREA lamp

Operation Indicator lamp

Front panel

Air filter

Air inlet

Plasma deodorizing filter

Plasma electrode unit

Plasma anti-allergy enzyme filter

Air outlet

Fan guard

Fan

Horizontal vane

POWER lamp

Heat exchanger

Vertical vane

CLEAN lamp

i-see Sensor

PLASMA lamp

Remote control receiving section

Emergency operation switch

Remote controller

ACCESSORIES

AREA lamp indicates AREA setting

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

Installation plate 1 Installation plate ﬁ xing screw 4 × 25 mm 5 Remote controller holder 1 Fixing screw for 3.5 × 1.6 mm (Black) 2 Battery (AAA) for remote controller 2 Wireless remote controller 1 Felt tape (Used for left or left-rear piping) 1

i-see control operation

i-see Sensor constantly measure ﬂ oor/wall temperature to automatically adjust to the set temperature by estimating the temperature actually perceived by a person inside the room (“sensible temperature”).

SPECIFICATION

Indoor model

Power supply

Power input 1

Running current 1

Electrical

data

Model RC0J40-GF

Fan motor

Dimensions W×H×D mm 798 × 295 × 257 Weight kg 12

Color

Air direction 4

Airﬂ ow

Sound level

Special remarks

Fan speed

Fan speed regulator 4

Remote controller model

NOTE: Test conditions are based on ISO 5151. Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19°C Outdoor Dry-bulb temperature 35°C Heating: Indoor Dry-bulb temperature 20°C Outdoor Dry-bulb temperature 7°C Wet-bulb temperature 6°C 1 Measured under rated operating frequency.

Current 1

Cooling

Heating

Cooling

Heating

Cooling

Heating

Cooling Heating 31 33 Cooling Heating 0.30 0.32

Cooling Heating 0.30 0.32

Super High High 516 672 Med 378 534 Low 276 378 Super High 726 750 888 High 552 Med 402 534 Low 270 282 330 Super High High 36 45 Med 29 39 Low 20 Super High 43 44 50 High 36 43 Med 29 37 Low 20 21 27 Super High High 950 1,200 Med 740 1,000 Low 580 760 Super High 1,270 1,300 1,500 High 1,010 Med 780 Low 570 590

dB(A)

rpm

MSZ-FD25VA

MSZ-FD25VAS

26 28

0.25 0.27

FD25VA

PURE WHITE

FD25VAS

SILVER

672 888

42 43 52

1,190 1,500

MSZ-FD35VA

MSZ-FD35VAS

Single phase 230 V, 50 Hz

FD35VA

PURE WHITE

FD35VAS

SILVER

: KM08A / E2: KM09D

MSZ-FD50VA

MSZ-FD50VAS

0.53

FD50VA

PURE WHITE

FD50VAS

SILVER

672

1,200 1,000

680

Speciﬁ cations and rating conditions of main electric parts

Fuse (F11) 250 V 3.15 A i-see Sensor motor (MT) MP20Z 12 VDC 300 Ω (at 25°C) Horizontal vane motor (MV1) MSFBC20C29 12 VDC 350 Ω (at 25°C) Vertical vane motor (MV2) MSBPC20M11 12 VDC 300 Ω (at 25°C) Varistor (NR11) S10K320E3K1 i-see Sensor (RR) A2TPMI 23A FOV50 OBA060 P8L1 J4S Terminal block (TB) 3P

NOISE CRITERIA CURVES

MSZ-FD25VA MSZ-FD25VAS

FAN SPEED

Super High

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

FUNCTION

COOLING

HEATING

SPL(dB(A))

42 43

NC-10

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MSZ-FD35VA MSZ-FD35VAS

FAN SPEED

Super High

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

FUNCTION

COOLING

HEATING

SPL(dB(A))

43 44

NC-10

LINE

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

MSZ-FD50VA MSZ-FD50VAS

FAN SPEED

Super High

FUNCTION

COOLING

HEATING

SPL(dB(A))

52 50

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

Heating : Dry-bulb temperature 20 Wet-bulb temperature 15.5

LINE

INDOOR UNIT

WALL

1 m

0.8 m

MICROPHONE

NC-70

NC-60

NC-50

NC-40

NC-30

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-10

NC-20

OUTLINES AND DIMENSIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

11 X 26 Oblong hole

254

100

Air out

212.5

Air in

Insulation ø35 O.D Liquid line ø7 - 0.5 m (Flared connection ø6.35)

Piping

Gas line

Drain hose Insulation ø28 O.D Connected part ø16 O.D

Installation plate

798 785

295

55 55688

159

6.5

Indoor unit

11 X 20 Oblong hole

225 225

155155

345

Installation plate

5257

Piping

43 85 97

330 69

Drain hose

25/35: ø9.52 - 0.43 m (Flared connection ø9.52) 50: ø9.52 - 0.43 m (Flared connection ø12.7)

211.5

Wall hole ø65

Unit: mm

21.5

253

231.5

WIRING DIAGRAM

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

REFRIGERANT SYSTEM DIAGRAM

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

Refrigerant pipe ø9.52 (with heat insulator)

Unit: mm

MSZ-FD50VA MSZ-FD50VAS

Indoor heat exchanger

Indoor coil thermistor RT13 (sub)

Room temperature thermistor RT11

Indoor coil thermistor RT12 (main)

Flared connection

Refrigerant pipe ø6.35 (with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

Indoor heat exchanger (Main)

Indoor heat exchanger (Sub)

Room temperature thermistor RT11

Indoor coil thermistor RT12 (main)

Indoor coil thermistor RT13 (sub)

Refrigerant pipe ø12.7 (with heat insulator)

Flared connection

Refrigerant pipe ø6.35 (with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

SERVICE FUNCTIONS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

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

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.

RESET button.

Table 1

1 unit operation 2 units operation 3 units operation 4 units operation

No. 1 unit No modiﬁ cation Same as at left Same as at left Same as at left

No. 2 unit — Solder J1 Same as at left Same as at left

No. 3 unit — — Solder J2 Same as at left

No. 4 unit — — — Solder both J1 and J2

How to set the remote controller exclusively for particular indoor unit

After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit 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

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. 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 10-7.)

CN130

IC156

JR07

CN1U1

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.

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.

CN212

CN1T1

CN151 CN211CN112 CN1R1

Slide switch

Where is the indoor unit installed in your room?

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

(Left) (Center) (Right)

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.

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

Area Left Center Right

Position of

the slide

switch

Display on

the remote

controller

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

MICROPROCESSOR CONTROL

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

WIRELESS REMOTE CONTROLLER

Signal transmitting section

Operation display section

OPERATE/STOP (ON/OFF) button

Temperature buttons

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

PLASMA button

CLEAN button

i-see button AREA button RESET button

Indication of remote controller model is on back

VANE CONTROL button

OFF TIMER button

ON TIMER button

TIME SET buttons FORWARD button BACKWARD button

WIDE VANE button

(Vertical vane button)

CLOCK SET button

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 Operation state

AREA Refer to 9-7.

POWER

CLEAN

PLASMA

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 temperature 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 1°C below the set

temperature.

HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 1°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 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 first is selected. Other indoor units cannot operate, and operation indicator lamp flashes as shown in the figure below. In this case, please set all the indoor units to the same operation mode.

L AREA R POWER CLEAN PLASMA

Lighted

Blinking

Not lighted

•When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10 minutes) to blow out the warm air.

•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.

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.

AUTO

(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.

→ 1 → 2 → 3 → 4 → 5 →

SWING

(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.

HEAT operation Vane angle is fixed to Angle 4.

(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.

(7) SWING ( ) mode

By selecting SWING mode with VANE CONTROL button, 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 does not work in the indoor unit.

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

To change the airﬂ ow direc-

tion

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 HEAT

Use this function if you do not 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 previouslyset 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 get warm. To warm the area around the feet, set the horizontal vane to

(AUTO) or the down-

ward-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.

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 conditio

ner operates with Very Low speed until the compressor turns on again.

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

When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 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

(SWING)

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). (b) SWING is started.

(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

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 (“sensible 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 batteries

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 Installed at left Installed at center Installed at right

Image of sensing

range

Direction of sensor Right Center Left

Refer to "Remote controller in SERVICE FUNCTIONS".

• Install the front panel correctly after being removed for maintenance or service so that the ﬂ oor/wall temperatures can be measured correctly

9-7. AREA ( ) SETTING

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

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

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

NOTE 1: AREA setting is only available during i-see control operation. NOTE 2: If AREA setting is cancelled, the vertical vane returns to the previously set position before AREA setting. NOTE 3: The horizontal air ﬂ ow direction (WIDE VANE button), including horizontal SWING, cannot be set during AREA

(AUTO) (LEFT) (RIGHT) Cancel

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

setting

Indoor unit installation location and air-conditioning area

Installed at left Installed at center Installed at right

LEFT RIGHT LEFT RIGHT LEFT RIGHT

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. (Refer to "Remote controller in SERVICE FUNCTIONS".)

Remote controller button

Remote controller display

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.)

Indoor unit display

Installed at center

Installed at left

Installed at right

AREA

To air-condition mainly the left area of the room

Press AREA button to select LEFT .

L R

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

Press AREA button toselect AUTO.

L R L R L R L R

To air-condition mainly the right area of the room

Press AREA b u t t o n to select RIGHT.

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.

Ex.) In COOL mode

Lighted Not lighted

Approx. 150 degrees

Daytime Nighttime

Warm area Cold area

Moving of horizontal air flow direction

Indication of AREA setting

display

Indoor unit

• The horizontal air flow direction changes if i-see Sensor detects approx. 3 °C temperature difference.

• In AUTO of AREA setting, both right and left lamps are lighted when the room is evenly air-conditioned.

NOTE

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

AREA RL AREA RL

AREA RL

Lighted Not lighted

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 AREA setting made with the remote controller.

“AUTO” in AREA setting: 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 AREA setting: 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 AREA setting: 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 energized. (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 ﬁ lter. Particles of allergens such as pollen and house dust are collected by the plasma anti-allergy ﬁ lter. These ﬁ lters work with negative ions generated by the plasma electrode unit.

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 operated 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 (

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

• 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 (

START

) during operation.

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

and ) to set the current time.

OFF timer setting

(a) Press OFF TIMER button (

STOP

) during operation.

(b) 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. To release the timer

To release ON timer, press ON TIMER button ( To release OFF timer, press OFF TIMER button (

START

STOP

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 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.

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 AREA lamp 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 24°C 24°C

Fan speed Med. Med.

Horizontal vane Auto Auto

Vertical vane Straight Straight

The operation mode is indicated by the AREA lamp as following

AREA lamp L AREA R

EMERGENCY

COOL

EMERGENCY

HEAT

↓

Lighted

Not lighted

↓

STOP

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

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.

TROUBLESHOOTING

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

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.

Remove the front lid and insert batteries.

Then reattach the front lid.

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

NOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly.

2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the

battery replacement.

Housing point

Press RESET button with a thin instrument, and

then use the remote controller.

RESET button

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 to .

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

Lock

In procedure lock the stoppers until they click into place.

10-2. 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 (10-4.) 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 does not recur.

Setting up the failure mode recall function

Turn ON the power supply. <Preparation of the remote controller>

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

remote controller at the same time, press RESET button.

First, release RESET button.

And release the other two buttons after all LCD in operation display section of the

remote controller is displayed after 3 seconds.

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

Does the 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. 2

Yes

Judgment of indoor/outdoor abnormality

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 conﬁ rm the abnormal point with the indoor unit failure mode table. (Refer to 10-2.4) Make sure to check at least two consecutive blinking cycles. 2

Releasing the failure mode recall function

Deleting the memorized abnormal condition

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.

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 is set up, otherwise the unit cannot operate properly.

2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.

2. Blinking pattern when the indoor unit is abnormal: Blinking at 0.5-

2.5-second OFF

OFF

3. Blinking pattern when the outdoor unit is abnormal:

2.5-second OFF 3-second ON

OFF

second interval

Repeated cycle Repeated cycle

(Blinks)

2.5-second OFF

Beeps

Blinking at 0.5second interval

No beep Beeps

Repeated cycle

No (OFF)

Yes

Blinking at 0.5second interval

Beeps

2.5-second OFF 3-second ON

1. Regardless of normal or abnormal condition, a short

Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that can not be recalled with this way. Conﬁ rm 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 conﬁ rm 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.

beep is emitted once the signal is received.

Beeps

Repeated cycle

No beep Beeps

Repeated cycle

Blinking at 0.5second interval

Repeated cycle

2. Flow chart of PLASMA operation failure mode recall function

Operational procedure

The plasma electrode unit might be abnormal. Conﬁ rm if outdoor unit is abnormal according to the following procedures.

Conﬁ rm that the remote controller is in the failure mode recall function.

With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 23°C. 1

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. 2

Yes

)

(Blinks

The plasma electrode unit is abnormal. Check the blinking pattern, and refer to conﬁ rm the abnormal point with the PLASMA operation failure mode table. (10-2.5.) Make sure to check at least two consecutive blinking cycles. 2

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". (10-2.1.)

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" men-

tioned above.

NOTE: 1. Make sure to release the failure mode recall function once it is 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.

No (OFF)

1. Regardless of normal or abnormal condition, 2 short beeps are emitted as the signal is received.

The plasma electrode unit is normal.

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

2. Blinking pattern when plasma unit is abnormal:

OFF

Blinking at 0.5-

2.5-second OFF

second interval

Beeps

Repeated cycle Repeated cycle

2.5-second OFF

Blinking at 0.5second interval

Beeps

Repeated cycle

3. PLASMA operation check

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

PLASMA lamp Correspondence

Continuously blinking Follow "Check of PLASMA operation" to identify the error. (Refer to 10-6.

2-time ﬂ ash

There is failure in PLASMA operation control circuit on the indoor electronic control P.C. board. (Refer to 10-6. )

)

Not lighted Normal

4. Indoor unit failure mode table

POWER lamp

Not lighted Normal — —

1-time ﬂ ash every

0.5-second

2-time ﬂ ash

2.5-second OFF 3-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)

Room temperature thermistor

Indoor coil thermistor

Serial signal

Indoor fan motor

Indoor control system

Condition Correspondence

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

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

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

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

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

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

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

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

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

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

POWER lamp

1-time ﬂ ash

2-time ﬂ ash Spark discharge

3-time ﬂ ash

4-time ﬂ ash

5-time ﬂ ash

Abnormal point

(Failure mode)

PLASMA power supply control

Abnormal electric discharge error 1

Abnormal electric discharge error 2

PLASMA DEODORIZING

Condition Correspondence

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

The voltage between CN1 on the PLASMA POWER P.C. board falls below

1.6 V (spark discharge judgment voltage). The voltage between CN1 (+) and

on the PLASMA POWER P.C. board falls by

0.9 V below the normal voltage value (3 V). The voltage between CN1

on the PLASMA POWER P.C. board falls signiﬁ cantly. (0.4 V / 0.5 ms)

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

(+) and (GND)

(GND)

(+) and (GND)

Replace the indoor electronic control P.C. board.

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

NOTE 1: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.). NOTE 2: 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.

NOTE 3: When POWER lamp flashes 1-time or 2-time, please perform PLASMA operation check (Refer to 10-2.3).

10-3. INSTRUCTION OF TROUBLESHOOTING

Indoor unit operates. Outdoor unit does not operate.

Outdoor unit operates only in Test Run operation.

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

Start

Outdoor unit does not operate even in Test Run operation.

Refer to "How to check inverter/compressor".

Indoor unit operates. Outdoor unit does not operate normally.

Unit does not operate normal operation in COOL or HEAT mode.

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

"Test Run operation" means

the operation within 30 minutes after EMERGENCY OPERATION switch is pressed.

Indoor unit does not receive the signal from remote controller.

Indoor unit operates, when EMERGENCY OPERATION switch is pressed.

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

Indoor unit does not operate, when EMERGENCY OPERATION switch is pressed.

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

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

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

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

PLASMA lamp 2-time flash

Cause:

• Trouble of PLASMA operation

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

Refer to outdoor unit service manual.

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. "Check of installation of the horizontal vane".

POWER

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

• Miswiring or

trouble of serial signal

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

POWER

lamp 2-time ﬂ ash Cause: Indoor unit

• Trouble

of room temperature / indoor coil thermistor

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

POWER

lamp 3-time ﬂ ash Cause: Indoor unit

• Trouble of

indoor fan motor

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

POWER

lamp 4-time ﬂ ash Cause: Indoor unit

• Trouble

of indoor unit control system

Replace the indoor electronic control P.C. board.

POWER

lamp 5-time ﬂ ash Cause: Outdoor unit

• Outdoor

power system abnormality

Refer to "How to check inverter/compressor".

POWER

lamp 6-time ﬂ ash Cause: Outdoor unit

• Trouble of

thermistor in outdoor unit

Refer to "Check of outdoor thermistors".

POWER

lamp 7-time ﬂ ash Cause: Outdoor unit

• Trouble of

outdoor control system

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

POWER

lamp 14-time ﬂ ash Cause: Outdoor unit

• Other ab-

normality

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

10-4. 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.

L AREA R POWER CLEAN PLASMA

Abnormal

No.

point

Miswiring or serial signal

Indoor coil thermistor

Room temperature thermistor

Indoor fan motor

Indoor control system

Outdoor power system

Outdoor thermistors

POWER lamp ﬂ ashes.

0.5-second ON

0.5-second OFF

POWER lamp ﬂ ashes. 2-time ﬂ ash

POWER lamp ﬂ ashes. 3-time ﬂ ash

POWER lamp ﬂ ashes. 4-time ﬂ ash

POWER lamp ﬂ ashes. 5-time ﬂ ash

POWER lamp ﬂ ashes. 6-time ﬂ ash

Operation indicator lamp Symptom Condition Correspondence

2.5-second OFF

Lighted

Blinking

Not lighted

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.

Refer to 10-6. "How to check

• miswiring and serial signal error".

Refer to 10-7. the character-

• istics of indoor coil thermistor, and the room temperature thermistor.

Refer to 10-6. "Check of in-

• door fan motor".

Replace the indoor electronic

• control P.C. board.

Refer to "How to check of in-

• verter/compressor". Refer to outdoor unit service manual Check the stop valve.

•

Refer to "Check of outdoor

• thermistor". Refer to outdoor unit service manual.

Outdoor

control system

Other ab-

normality

Outdoor

control system

POWER lamp ﬂ ashes. 7-time ﬂ ash

2.5-second OFF

POWER lamp ﬂ ashes. 14-time ﬂ ash

2.5-second OFF

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.

An abnormality other than above mentioned is detected.

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

Replace the inverter P.C. board

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

Check the stop valve.

• Conﬁ rm the abnormality in

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

Check the blinking pattern of

• the LED on the inverter P.C. board or the outdoor electronic control P.C. board.

L AREA R POWER CLEAN PLASMA

Abnormal

No.

point

Attachment of the horizontal vane

All lamps ﬂ ash at the same time.

0.5-second ON

0.5-second OFF

Operation indicator lamp Symptom Condition Correspondence

L AREA R POWER CLEAN PLASMA

Abnormal

No.

point

MXZ type

Operation mode setting

POWER lamp is lighted. AREA lamps ﬂ ash.

Operation indicator lamp Symptom Condition Correspondence

2.5-second OFF

Indoor unit and outdoor unit do not operate.

Outdoor unit operates but indoor unit does not operate.

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

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 ﬁ rst has the priority.

Refer to 10-6. "Check of in-

• stallation of the horizontal vane".

•

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

L AREA R POWER CLEAN PLASMA

Abnormal

No.

point

PLASMA control

PLASMA lamp ﬂ ashes. 2-time ﬂ ash

Operation indicator lamp Symptom Condition Correspondence

2.5-second OFF

Indoor unit and outdoor unit do not operate.

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

Refer to 10-6. ”Check of

• PLASMA operation”.

10-5. TROUBLE CRITERION OF MAIN PARTS

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

Part name Check method and criterion Figure

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Measure the resistance with a tester.

Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control P.C. board", for the chart of thermistor.

Indoor fan motor (MF) Check 10-6.

Measure the resistance between the terminals with a tester.

Horizontal vane motor

(Part temperature 10 ~ 30°C)

(MV1) Vertical vane motor (MV2) i-see Sensor motor (MT)

Horizontal vane motor (MV1) Vertical vane motor (MV2) 268 ~ 322 Ω i-see Sensor motor (MT) 223 ~ 268 Ω

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)

i-see Sensor

i-see Sensor P.C. board

i-see Sensor (RR)

Black vinyl tape

Color of the lead wire Normal

BRN - other one

4 3 2(GND) 1

connector

Cover the i-see Sensor with black vinyl tape.

313 ~ 375 Ω

RED

YLW BRN

ROTOR

ORN

GRN

i-see Sensor connector terminals Normal range

NOTE: Pay attention to static electricity.

PLASMA electrode unit Check 10-6.

(GND) - (+) 1.874 ~ 3.387 VDC (+) - (GND) 1.010 ~ 1.420 VDC

10-6. TROUBLESHOOTING FLOW

A Check of indoor fan motor

The indoor fan motor error has occurred, and the indoor fan does not operate.

Turn OFF the power supply.

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

Yes

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

Is there 325 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 OPERATION switch is pressed?

Replace the indoor electronic control P.C. board.

Pay enough 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 EMERGENCY OPERATION switch is pressed. If more than 12 seconds passes, turn OFF the power supply and turn it ON 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 measured at 2. above goes 0 VDC although the indoor electronic control P.C. board is normal

Indoor electronic

Yes

Replace the indoor fan motor.

control P.C. board

CN211

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

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

rotating.

Is it unchanged holding 0 or 15 VDC?

Yes (Unchanged)

Replace the indoor fan motor.

No (Changed)

Replace the indoor electronic control P.C. board.

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

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 ﬂ uorescent 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 ﬁ lter on receiving part.

•

C Check of indoor electronic control 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.

Measure the resistance between CN211 and of the indoor fan motor

Yes

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

Is 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 (+) and (-) of the indoor fan motor connector. 1, 2

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.

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?

Replace the fuse (F11).

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

Yes

Is the resistance approx. 4 Ω?

Replace the indoor electronic control P.C. board.

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

Yes

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

D How to check miswiring and serial signal error

Turn OFF the power supply.

Is there rated voltage in the power supply?

Yes

Turn ON the power supply.

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

Press EMERGENCY OPERATION switch once.

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

Is serial signal error indicated 6 minutes later?

Turn OFF the power supply. Check once more if the indoor/outdoor

connecting wire is not miswiring. Short-circuit outdoor terminal block S2 and S3.

Turn ON the power supply.

Yes

Check the power supply.

Check the wiring.

Is there any miswiring, poor contact, or wire disconnection of the

indoor/outdoor connecting wire?

1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to conﬁ rm the wiring is correct before the opera- tion starts.

3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes.

(Except for outdoor unit of multi system type)

Yes

Correct them.

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 away from

•

each other. Attach a ﬁ lter on remote control receiving section of the indoor unit.

Is serial signal error indicated 6 minutes later?

Yes

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-secondON quick blinking"?

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

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

Replace the indoor electronic control P.C. board.

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

3 Yes

Yes

No (Lighted or not lighted)

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

2. Be careful of the residual voltage of smoothing capacitor.

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

Replace the indoor/outdoor

Yes

connecting wire.

Replace the indoor/outdoor connecting wire.

Yes

E Check of installation of the horizontal vane

Turn OFF the power supply.

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

Yes

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

Is there resistance 0 Ω?

Yes

Replace the indoor electronic control P.C. board.

F Check of PLASMA operation

No(∞)

Re-lock the stopper of the horizontal vane to the indoor unit.

(Refer to 10-1.5.)

Replace the interlock switch (Fan).

Turn ON the power supply.

Are all lamps flashing?

Yes

Turn OFF the power supply.

Turn ON the power supply.

Does PLASMA lamp flash 2-time with unit stopping?

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 (the set tempera-

ture is displayed)

And press PLASMA button once with the remote controller

headed towards the indoor unit.

PLASMA operation is selected.

The 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.

Continuously blinking.

Yes

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).

Replace the indoor electronic control P.C. board.

PLASMA operation

Normal

2 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 does not go OFF.)

1 Regardless of normal or abnormal condi-

tion, a short beep is emitted once the signal is received.

G Electromagnetic noise enters into TV sets or radios

Is the unit earthed?

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?

Yes

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.

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 following 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 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.

10-7. TEST POINT DIAGRAM AND VOLTAGE

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

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)

325 VDC

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

15 VDC

(+)3-6 VDC

(+)0 or 15 VDC

Interlock switch(Fan) (CN1R1)

Room temperature thermistor RT11 (CN111)

Varistor (NR11)

CN201 (Used for check of conducting of thermal fuse)

Indoor coil thermistor RT12, RT13 (CN112)

Plasma electrode unit (CN1T1)

(LD101)

- : Connect to the monitor P.C.board

- : Connect to the power monitor receiver

P.C.board

i-see Sensor (CN110)

Release of Auto restart function Solder the Jumper wire JR07 (Refer to 8-3.)

Horizontal vane (CN1U1)

Vertical vane (CN151)

Timer short mode

point JPG, JPS

Fuse (F11)

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

Resistance (k )

(Refer to 8-1.)

Temperature ( )

2. Power monitor receiver P.C. board

3. Monitor P.C. board

4. Plasma power P.C. board

CN1

DC 2.5 V during PLASMA DEODORIZING operation

GND

DC 12.5 V during PLASMA DEODORIZING operation

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.

Sleeve

Slide the sleeve. Pull the terminal while

Locking lever

pushing the locking lever.

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

Hold the sleeve, and pull out the terminal slowly.

Connector

MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS

NOTE: Turn OFF power supply before disassembling.

OPERATING PROCEDURE PHOTOS

1. Removing the panel

(1) Hold 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. (4) Unhook the lower part ( ) of the panel. (5) 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

Horizontal vane

Front panel

Screws of the 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 the indoor/outdoor connecting wire. (Photo

(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. (Photo 3)

(5) Remove the earth wire connected to the indoor elec-

tronic control P.C. board from the electrical box. (Photo

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

er. (Photo 4)

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

receiver P.C. board holder.

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

assembling it. (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. (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. (Photo 2)

(15)

Remove the terminal block by sliding it.

Photo 2

Photo 3

Drain hose

Screw of the terminal block cover

Screw of the V.A. clamp

Earth wire to the heat exchanger

Sensor holder

Screw of the electrical cover

Sensor holder (inside)

Photo 4

i-see Sensor

Plasma power P.C. board holder

Power monitor receiver P.C. board holder

Catches of the electrical box

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 sen-

sor holder, the electrical cover and the earth wire. (Refer to 2.)

(3) Disconnect the following connectors on the electronic

control P.C. board: CN211 (Fan motor) CN112 (Indoor coil thermistor) CN1U1 (Horizontal vane motor) CN151 (Vertical vane motor) CN1R1 (Interlock switch) CN1T1 (Plasma power P.C. board)

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

the electrical box. (Photo 4)

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

connecting wire. (Photo 2)

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

(Photo 3.)

(4) Disconnect the following connectors on the electronic

control P.C. board: CN1U1 (Horizontal vane motor) CN151 (Vertical vane motor) CN1R1 (Interlock switch)

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

and the plasma power P.C. board holder. (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.

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

(Photo 7)

(6) Remove the vertical vane motor from 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

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.

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

cover.

(4) Remove the horizontal vane motor from the horizontal

vane motor unit.

(5) 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. (Photo 10) (5) Loosen the screw fixing the line flow fan. (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

exchanger. ( ) Install the indoor coil thermistor (RT12) in its former

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

exchanger. (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 MSZ-FD25/35

MSZ-FD50

Screw of the line flow fan

Indoor coil thermistor (RT12)

Photo 12

Screws of the left side of the heat exchanger

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

Distributed in Dec. 2008. No. OBH488 REVISED EDITION-C 5 Distributed in Jul. 2008. No. OBH488 REVISED EDITION-B 6 Distributed in Oct. 2007. No. OBH488 REVISED EDITION-A 6 Distributed in Aug. 2007. No. OBH488 6 Made in Japan

New publication, effective Dec. 2008 Specifications subject to change without notice.

Mitsubishi MSZ-FD50VA-E1, MUZ-FD50VA-E1 user guide manual

Specifications and Main Features

Frequently Asked Questions

User Manual