Mitsubishi Electric MSZ-WN25VA - E1 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·····································8
7. REFRIGERANT SYSTEM DIAGRAM·············9
8. SERVICE FUNCTIONS······························10
9. MICROPROCESSOR CONTROL ················ 11
10. TROUBLESHOOTING·······························15
11. DISASSEMBLY INSTRUCTIONS·················27
Outdoor unit service manual
MUZ-WN·VA Series (OBH765)
MSZ-WN25VA
MSZ-WN35VA
INDOOR UNIT
Models
MSZ-WN25VA -E1
MSZ-WN35VA -E1
SERVICE MANUAL
NOTE:
RoHS compliant products have
<G> mark on the spec name plate.
No. OBH764
PARTS CATALOG (OBB764)
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2
<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 remove 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 specified 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.
OBH764

3
1TECHNICAL CHANGES
MSZ-WN25VA - E1
MSZ-WN35VA - E1
1. New model
OBH764

4
ACCESSORIES
MSZ-WN25VA MSZ-WN35VA
Installation plate 1
Installation plate fixing screw 4 ×25 mm 5
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Battery (AAA) for remote controller 2
Air cleaning filter (Silver-ionized air purifier filter) 1
2PART NAMES AND FUNCTIONS
Operation indicator lamp
Remote control
receiving section
Horizontal vane
Air inlet
Air ¿lter
(Air purifying filter)
Front panel
Air outlet Heat exchanger
Emergency operation switch
Remote controller
Air cleaning ¿lter
(Silver-ionized air
purifier filter)
Display section
OBH764

5
3SPECIFICATION
Indoor model MSZ-WN25VA MSZ-WN35VA
Power supply Single phase 230 V, 50 Hz
Breaker Capacity A 10
Electrical data
Power input 1 (Total) Cooling W710 1,020
Heating 850 975
Running current 1
(Total)
Cooling A3.6 4.8
Heating 4.1 4.7
Power factor 1 (Total) Cooling %85 92
Heating 90
Starting current 1 (Total) A 4.1 4.8
Fan motor
Model RC0J40-EF
Current 1 Cooling A0.19 0.26
Heating 0.20 0.22
Dimensions W × H × D mm 799 × 290 × 232
Weight kg 9
Special remarks
Air direction 5
Airflow
Cooling
Super High
m3/h
570 684
High 438 468
Med. 330 342
Low 228
Heating
Super High
m3/h
600 618
High 450
Med. 330
Low 210
Sound level
Cooling
Super High
dB(A)
43 46
High 37 38
Med. 30 31
Low 22
Heating
Super High
dB(A)
43 44
High 37
Med. 30
Low 23
Fan speed
Cooling
Super High
rpm
1,080 1,240
High 880 930
Med. 710 730
Low 550
Heating
Super High
rpm
1,120 1,150
High 900
Med. 710
Low 520
Fan speed regulator 4
Remote controller model SG17A
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 VDC
Varistor (NR11) S10K300E2K1 (ERZV10D471)
Terminal block (TB) 5P
OBH764

6
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
43
NC-10
MSZ-WN25VA
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
44
46
NC-10
MSZ-WN35VA
4NOISE CRITERIA CURVES
OBH764

7
MSZ-WN25VA MSZ-WN35VA Unit: mm
5OUTLINES AND DIMENSIONS
2325
69
41
799
785 7
290
12063049
57
80
42
43
69
57
42
7
103
130
100
(57°)
225 225 80.580.5
61.5 59.5340338
41
42
249
248 21.5
3
167 157
207.5
206.5
172
14
46
60
193
19
PIPING
INSULATION Ø35 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 Ø28 CONNECTED PART Ø16 O.D
AIR IN
INSTALLATION PLATE
PIPING
DRAIN HOSE
AIR OUT
11×26 OBLONG HOLE 11×20 OBLONG HOLE
INSTALLATION PLATE
INDOOR UNIT
WALL HOLE
Ø 65
OBH764

8
MSZ-WN25VA MSZ-WN35VA
6WIRING DIAGRAM
OBH764

9
MSZ-WN25VA MSZ-WN35VA
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
OBH764

10
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-WN25VA MSZ-WN35VA
8SERVICE FUNCTIONS
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.
JR77
Indoor electronic
control P.C. board
CN10ACN111
CN151
CN112
CN110
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.)
8-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
To operate the indoor units individually with each remote controller, assign a number to each remote controller according
to the number of the indoor unit.
This setting can be set only when all the following conditions are met:
• The remote controller is powered OFF.
(1) Hold down button on the remote controller for 2 seconds to enter the pairing mode.
(2) Press button again and assign a number to each remote controller.
Each press of button advances the number in the following order: 1 →2 →3 →4.
(3) Press button to complete the pairing setting.
After you turn the breaker ON, the remote controller that first sends a signal to an indoor unit will be regarded as the
remote controller for the indoor unit.
Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.
OBH764