Mitsubishi Electric MSZ-FD25VA User manual

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
MSZ-FD25VA -
MSZ-FD25VAS -
MSZ-FD35VA -
MSZ-FD35VAS - E1
E1
E1
E1
SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Outdoor unit service manual
MUZ-FD·VA Series(OBH489)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)
SERVICE MANUAL
Wireless type
Models
No. OBH488
INDOOR UNIT
PARTS CATALOG (OBB488)
OBH488-1.qxp 07.8.9 11:47 AM Page 1

2
OBH488-1.qxp 07.8.9 11:47 AM Page 2

3
1TECHNICAL CHANGES
MSZ-FD25VA - MSZ-FD25VAS -
MSZ-FD35VA - MSZ-FD35VAS - E1E1
E1E1
1. New model
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4
2PART NAMES AND FUNCTIONS
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
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
ACCESSORIES
1
2
3
4
5
6
7
Installation plate
Installation plate fixing screw 4 o25 mm
Remote controller holder
Fixing screw for 33.5 o1.6 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
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5
SPECIFICATION
3
Specifications and rating conditions of main electric parts
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor Dry-bulb temperature 27 :Wet-bulb temperature 19 :
Outdoor Dry-bulb temperature 35 :
Heating : Indoor Dry-bulb temperature 20 :
Outdoor Dry-bulb temperature 7 :Wet-bulb temperature 6 :
Refrigerant piping length (one way): 5 m
✽1 Measured under rated operating frequency.
MSZ-FD25VA MSZ-FD35VA
Single phase
230 V, 50 Hz
RCOJ40-GF
798O295O257
12
4
672
516/378/276
1,190
950/740/580
4
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
W
A
A
mm
kg
K/h
K/h
dB(A)
dB(A)
rpm
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
42
36/29/20
1,270
1,010/780/570
28
33
0.27
0.32
0.27
0.32
750
552/402/282
43
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
3P
Fuse
i-see Sensor motor
Horizontal vane motor
Vertical vane motor
Varistor
i-see Sensor
Terminal block
(F11)
(MT)
(MV1)
(MV2)
(NR11)
(RR)
(TB)
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6
4NOISE CRITERIA CURVES
MSZ-FD25VA
MSZ-FD25VAS
INDOOR UNIT WALL
MICROPHONE
0.8 m
1 m
90
80
70
60
50
40
30
20
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
Test conditions
Cooling : Dry-bulb temperature 27 : Wet-bulb temperature 19 :
Heating : Dry-bulb temperature 20 :
43
43
NC-10
MSZ-FD35VA
MSZ-FD35VAS
90
80
70
60
50
40
30
20
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 42
43
NC-10
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225 225 64
64
155155
345
54 330 69
42
211.5
3
253
231.5
41 212.5
254
43
69
7
43
85
97
295
21.5
56
55 55688
100
785
798 6.5
47
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
19
159
58
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
7
OUTLINES AND DIMENSIONS
5
Unit : mm
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
6WIRING DIAGRAM
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
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7REFRIGERANT SYSTEM 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
Unit : mm
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9
SERVICE FUNCTIONS
8
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.
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.)
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
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.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
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.
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 RESET button.
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
J2
J1
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10
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.
8-3. 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
1If the main power has been cut, the operation settings remain.
2After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to release “AUTO RESTART FUNCTION”
1Turn OFF the main power for the unit.
2Solder the Jumper wire to JR07 on the indoor electronic control
P.C. board. (Refer to 10-7.)
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 in-
stalled at right, left or
center?
JR07
CN151 CN211CN112 CN1R1
CN212
CN1T1
CN1U1
CN130
IC156
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11
MICROPROCESSOR CONTROL
9
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.
WIRELESS REMOTE CONTROLLER
The lamps at the center of the indoor unit indicates the operation state.
INDOOR UNIT LAMP
Operation state
Lamp Refer to 9-7.
Lamp lights during PLASMA operation.
Refer to 9-8.
Lamp lights during clean operation.
Refer to 9-9.
Lamp lights during operation.
Lamp blinks in abnormal condition.
AREA
POWER
CLEAN
PLASMA
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
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
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12
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.)
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.
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.
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. 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.
9-1. 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.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con-
densing 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”.
OBH488-1.qxp 07.8.9 4:06 PM Page 12

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 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.
13
(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.
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.
(4) VANE AUTO ( ) mode
The microprocessor automatically determines the vane angle to make the optimum room temperature distribution.
1
COOL and DRY operation
Vane angle is fixed to Angle 1. HEAT operation
Vane angle is fixed to Angle 4.
(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.
(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.
Lighted
Blinking
Not lighted
AREA R POWER CLEAN PLASMAL
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14
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 hori-
zontal 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 heat-
ing 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
( 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.
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.
(8) Cold air prevention in HEAT operation
The horizontal vane position is set to Upward.
(7) SWING ( ) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.
(SWING)
123 45
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 dis-
plays “”. Swing mode is cancelled when WIDE MODE button is pressed once again.
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15
9-6. i-see CONTROL OPERATION
The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by esti-
mating 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.
Refer to "Remote controller in SERVICE FUNCTIONS".
·Install the front panel correctly after being removed for maintenance or service so that the floor/wall temperatures can
be measured correctly.
Installed at left Installed at center Installed at right
Installation
position
Image of sensing
range
Direction of sensor Right Center Left
9-7. AREA ( ) SETTING
(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.
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16
●Indoor unit installation location and air-conditioning area
·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".)
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 in-
door unit display are switched accord-
ing to the room temperature (floor/wall).
To air-condition mainly
the right area of the room
Remote controller button Press AREA button
toselectLEFT. 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
Remotecontroller display
or or 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.
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Operation and operating range
i-see sensor moves 30 degrees from the center in both right and left side.
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.
17
(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.
9-8. 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.
i-see Sensor turning to the right
i-see Sensor turning to the center
i-see Sensor turning to the left
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18
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 ) . w
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.
START
STOP
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.
START
STOP
PROGRAM TIMER
(Example 1) The current time is 8:00 PM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
•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 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.
9-9. 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.
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19
EMERGENCY OPERATION switch (E.O.SW)
Not lighted
Lighted
The operation mode is indicated by the AREA
lamp as following
AREA lamp
EMERGENCY
HEAT
EMERGENCY
COOL
STOP
Operation mode COOL HEAT
Set temperature 24 :24 :
Fan speed Med. Med.
Horizontal vane Auto Auto
Vertical vane Straight Straight
NOTE:
This is the indication of EMERGENCY OPERATION
mode. AREA setting is not available during EMER-
GENCY OPERATION.
AREALR
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.
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.
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20
10 TROUBLESHOOTING
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.
NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by
the battery replacement.
10-1. 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.
Housing point
Lead wiring
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
RESET button
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
2Press RESET button with tip end of ball point pen
or the like, and then use the remote controller.
1Remove the front lid and insert batteries.
Then reattach the front lid.
Lock
2
1
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 1to 2.
NOTE : Before installation of the horizontal vane, turn OFF the power supply.
5. How to install the horizontal vane
In procedure 22lock the
stoppers until they click
into place.
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