Mitsubishi Electric MSZ-DW25VF User manual

CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS··················3
3. SPECIFICATION ········································4
4. NOISE CRITERIA CURVES··························5
5. OUTLINES AND DIMENSIONS·····················6
6. WIRING DIAGRAM·····································7
7. REFRIGERANT SYSTEM DIAGRAM·············8
8. SERVICE FUNCTIONS································9
9. MICROPROCESSOR CONTROL ················ 11
10. TROUBLESHOOTING·······························15
11. DISASSEMBLY INSTRUCTIONS·················27
INDOOR UNIT
SERVICE MANUAL No. OBH905
PARTS CATALOG (OBB905)
Models
MSZ-DW25VF -E1 , ER1 , ET1
MSZ-DW35VF -E1 , ER1 , ET1
MSZ-DW50VF -E1 , ER1 , ET1
Outdoor unit service manual
MUZ-DW·VF Series (OBH906)
MXZ-HA∙VF Series (OBH828)

2
1TECHNICAL CHANGES
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
Use the specied refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
MSZ-DW25VF - E1 , ER1 , ET1
MSZ-DW35VF - E1 , ER1 , ET1
MSZ-DW50VF - E1 , ER1 , ET1
1. New model
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in injuries.
OBH905

3
ACCESSORIES
MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF
(1) Installation plate 1
(2) Installation plate xing screw 4 ×25 mm 5
(3) Wireless remote controller 1
(4) Felt tape (For left or left-rear piping) 1
(5) Battery (AAA) for remote controller 2
2PART NAMES AND FUNCTIONS
Operation indicator lamp
Remote control
receiving section
Horizontal vane
Air inlet
Front panel
Air outlet
Heat exchanger
Emergency operation switch
Remote controller
Air cleaning filter
(V Blocking Filter,
option)
Display section
Fan guard
Air filter
(Air purifying filter)
OBH905

4
3SPECIFICATION
Indoor model MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF
Power supply Single phase 230 V, 50 Hz
Electrical
data
Power input
*1 Cooling W21 28 29
Heating 23 25 29
Running
current *1 Cooling A0.22 0.28 0.29
Heating 0.24 0.25 0.29
Fan
motor
Model RC0J30-CV
Current *1 Cooling A0.22 0.28 0.29
Heating 0.24 0.25 0.29
Dimensions W × H × D mm 799 × 290 × 232
Weight kg 9 10
Special remarks
Air direction 5
Airow
Cooling
Super High
m3/h
594 678 738
High 450 486 582
Med. 336 348 462
Low 216 216 354
Heating
Super High 618 642 756
High 462 462 582
Med. 336 336 462
Low 204 204 360
Sound level
Cooling
Super High
dB(A)
43 46 45
High 37 38 40
Med. 30 31 36
Low 21 22 28
Heating
Super High 43 44 47
High 37 37 41
Med. 30 30 34
Low 21 21 27
Fan speed
Cooling
Super High
rpm
1,080 1,200 1,140
High 880 930 950
Med. 710 730 800
Low 520 520 660
Heating
Super High 1,120 1,150 1,160
High 900 900 950
Med. 710 710 800
Low 500 500 670
Fan speed regulator 4
Remote controller model MS21A
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 rated conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 V DC
Varistor
(NR11) S10K300E2K1 (ERZV10D471)
Terminal block (TB) 5P
OBH905

5
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
43
44
NC-10
MSZ-DW25VF
INDOOR UNIT WALL
MICROPHONE
0.8m
1m
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°C Wet-bulb temperature 19°C
Heating : Dry-bulb temperature 20°C
45
47
NC-10
MSZ-DW35VF
4NOISE CRITERIA CURVES
MSZ-DW50VF
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
BAND CENTER FREQUENCIES, Hz
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
46
47
NC-10
OCTAVE BAND SOUND PRESSURE LEVEL, 0dB = 20 MICRO BAR
OBH905

6
MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF Unit: mm
5OUTLINES AND DIMENSIONS
MSZ-DW25/35/50VF
Piping
Insulation Ø37 O.D
Liquid line Ø7.0 - 0.39m (Flared connection Ø6.35)
Gas line Ø9.52 - 0.34m (Flared connection Ø9.52)
Drain hose
Insulation Ø29 Connected part Ø16 O.D
2325
69
41
799
785 7
290
12063049
57
80
42
43
69
57
42
7
103
130
100
(57°)
225 225 80.5 80.5
61.5
59.5340338
41
42
249
248 21.5
3
167 157
207.5
206.5
172
14
46
Air in
Installation plate
Piping
Drain hose
Air out
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole Ø65
140
57 18
OBH905

7
MSZ-DW25VF - E1 ,ER1 MSZ-DW35VF - E1 ,ER1 MSZ-DW50VF - E1 ,ER1
6WIRING DIAGRAM
MSZ-DW25VF - ET1 MSZ-DW35VF - ET1 MSZ-DW50VF - ET1
PARÇA ADI
İÇ ÜNİTE
KARTI
İÇ ÜNİTE
ELEKTRONİK
KONTROL KARTI
Konektör
Terminal bloğu
NOTLAR
:
1. Dış ünite elektronik kablolaması
için dış ünite elektronik kablo devre
şemasını referans alınız.
2. Sadece bakır besleme
kablosu kullanın
3. Sembolleri gösterir
DIŞ
ÜNİTEYE
SİGORTA
(T3.15AL250V)
FAN MOTORU
KANAT MOTORU
(YATAY)
VARİSTÖR
RESİSTÖR
ODA SICAKLIK
TERMİSTÖRÜ
BORU SICAKLIK
TERMİSTÖRÜ
(ANA)
BORU SICAKLIK
TERMİSTÖRÜ
(YARDIMCI)
TERMİNAL BLOĞU
OBH905

8
MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Indoor coil
thermistor
RT13
Unit: mm
7REFRIGERANT SYSTEM DIAGRAM
OBH905

9
8-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging the timer short mode point on the electronic control P.C.
board. (Refer to 10-7.)
Set time : 3-minute →3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by bridging the timer short mode point.)
NOTE: While the relay 52C is ON, the compressor starting time cannot be shortened.
MSZ-DW25VF MSZ-DW35VF MSZ-DW50VF
8SERVICE FUNCTIONS
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 :
Table 1 1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modication Same as at left Same as at left Same as at left
No. 2 unit – Solder J2 Same as at left Same as at left
No. 3 unit – – Solder J4 Same as at left
No. 4 unit –––Solder both J2 and J4
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are
set.
The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
The P.C. board has the print “J2” and “J4”. Solder “J2” and “J4” 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
OFF/ON (stop/operate)
button 2 or 3 times at first.
After finish modification,
put back the batteries then
press the RESET button.
J2
J4
OBH905

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 turned 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 the breaker from tripping 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 countermeasures 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 disable “AUTO RESTART FUNCTION”
Turn off the main power for the unit.
Cut the Jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 10-7.)
Indoor electronic
control P.C. board
JR77
CN112
CN151
CN111
CN1R1
OBH905