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
SPLIT-TYPE AIR CONDITIONERS
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Outdoor unit service manual
MUZ-FD·VA(H) Series (OBH489)
MUZ-FD·VABH Series (OBH519)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)
SERVICE MANUAL
Models
No. OBH488
REVISED EDITION-C
INDOOR UNIT
PARTS CATALOG (OBB488)
Revision C:
• MSZ-FD•VA(S)- E2 has been added.
Please void OBH488 REVISED EDITION-B.
MSZ-FD25VA - E1 ,E2
MSZ-FD25VAS - E1 ,E2
MSZ-FD35VA - E1 ,E2
MSZ-FD35VAS - E1 ,E2
MSZ-FD50VA - E1 ,E2
MSZ-FD50VAS - E1 ,E2

2
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.

3
MSZ-FD25VA - E1 MSZ-FD25VAS - E1
MSZ-FD35VA - E1 MSZ-FD35VAS - E1
MSZ-FD50VA - E1 MSZ-FD50VAS - E1
1. New model
TECHNICAL CHANGES
1
MSZ-FD25VA(S) - E1 →MSZ-FD25VA(S) - E2
MSZ-FD35VA(S) - E1 →MSZ-FD35VA(S) - E2
MSZ-FD50VA(S) - E1 →MSZ-FD50VA(S) - E2
1. Remote controller has been changed. (KM08A →KM09D)

4
ACCESSORIES
Installation plate 1
Installation plate fixing 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
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS
Fan
Fan guard
i-see Sensor
Air inlet
Air filter
Plasma deodorizing filter
Plasma electrode unit
Plasma anti-allergy
enzyme filter
Air outlet
Horizontal vane Vertical vane
Heat exchanger
Emergency operation switch
Remote controller
Remote control
receiving section
AREA lamp POWER lamp CLEAN lamp PLASMA lamp
Operation Indicator
lamp
Front panel
AREA lamp indicates 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”).
PART NAMES AND FUNCTIONS
2

5
Indoor model MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
MSZ-FD50VA
MSZ-FD50VAS
Power supply Single phase
230 V, 50 Hz
Electrical data
Power input 1 Cooling W26 28 60
Heating 31 33
Running current 1 Cooling A0.25 0.27 0.53
Heating 0.30 0.32
Fan motor
Model RC0J40-GF
Current 1 Cooling A0.25 0.27 0.53
Heating 0.30 0.32
Dimensions W×H×D mm 798 × 295 × 257
Weight kg 12
Color
FD25VA
PURE WHITE
FD35VA
PURE WHITE
FD50VA
PURE WHITE
FD25VAS
SILVER
FD35VAS
SILVER
FD50VAS
SILVER
Special remarks
Air direction 4
Airflow
Cooling
Super High
m3/h
672 888
High 516 672
Med 378 534
Low 276 378
Heating
Super High 726 750 888
High 552 672
Med 402 534
Low 270 282 330
Sound level
Cooling
Super High
dB(A)
42 43 52
High 36 45
Med 29 39
Low 20 21 29
Heating
Super High 43 44 50
High 36 43
Med 29 37
Low 20 21 27
Fan speed
Cooling
Super High
rpm
1,190 1,500
High 950 1,200
Med 740 1,000
Low 580 760
Heating
Super High 1,270 1,300 1,500
High 1,010 1,200
Med 780 1,000
Low 570 590 680
Fan speed regulator 4
Remote controller model E1 : KM08A / E2 : KM09D
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.
Specifications 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
SPECIFICATION
3

6
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 Wet-bulb temperature 15.5
43
44
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
MSZ-FD50VA MSZ-FD50VAS
NOISE CRITERIA CURVES
4
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
52
50
NC-10

7
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 ø65
11 X26 Oblong hole 11 X20 Oblong hole
Indoor unit
Installation plate
5257 Installation plate
Piping
Drain hose
Air in
Air out
19
159
58
Unit: mm
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS
Piping
Insulation ø35 O.D
Liquid line ø7 - 0.5 m (Flared connection ø6.35)
Gas line 25/35: ø9.52 - 0.43 m (Flared connection ø9.52)
50: ø9.52 - 0.43 m (Flared connection ø12.7)
Drain hose Insulation ø28 O.D Connected part ø16 O.D
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
MSZ-FD50VA MSZ-FD50VAS
OUTLINES AND DIMENSIONS
5
WIRING DIAGRAM
6

8
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: mm
MSZ-FD50VA MSZ-FD50VAS
Indoor
heat
exchanger
(Main)
Flared connection
Room
temperature
thermistor
RT11 Flared connection
Refrigerant pipe ø12.7
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
Indoor heat
exchanger
(Sub)
REFRIGERANT SYSTEM DIAGRAM
7

9
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:
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 MSZ-FD50VA MSZ-FD50VAS
J2
J1
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modification 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.
SERVICE FUNCTIONS
8

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
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.)
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 switch
Position of
the slide
switch
Display on
the remote
controller
Installed at left, if the
distance is not more
than 50 cm.
Installed at right, if the
distance is not more
than 50 cm.
Is the indoor unit
installed at right,
left or center?
JR07
CN151 CN211CN112 CN1R1
CN212
CN1T1
CN1U1
CN130
IC156