Mitsubishi Electric MSZ-DM25VA 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 ················ 12
10. TROUBLESHOOTING ······························· 16
11. DISASSEMBLY INSTRUCTIONS ················· 28
Outdoor unit service manual
MUZ-DM·VA Series (OBH751)
MXZ-DM•VA Series (OBH739)
MSZ-DM25VA
MSZ-DM35VA
INDOOR UNIT
Models
MSZ-DM25VA - E1 , ER1
MSZ-DM35VA - E1 , ER1
SERVICE MANUAL
NOTE:
RoHS compliant products have
<G> mark on the spec name plate.
No. OBH750
PARTS CATALOG (OBB750)

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 specif 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.
OBH750

3
1TECHNICAL CHANGES
MSZ-DM25VA - E1 , ER1
MSZ-DM35VA - E1 , ER1
1. New model
OBH750

4
ACCESSORIES
MSZ-DM25VA MSZ-DM35VA
Installation plate 1
Installation plate f xing 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 f lter (Silver-ionized air purifer f lter) 1
2PART NAMES AND FUNCTIONS
Operation indicator lamp
Remote control
receiving section
Horizontal vane
Air inlet
Air filter
Front panel
Air outlet
Heat exchanger
Emergency operation switch
Remote controller
Air cleaning filter
(Silver-ionized air
purifier filter)
Display section
OBH750

5
3SPECIFICATION
Indoor model MSZ-DM25VA MSZ-DM35VA
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 0.24
Heating 0.20 0.22
Dimensions W × H × D mm 799 × 290 × 232
Weight kg 9
Special remarks
Air direction 5
Airf ow
Cooling
Super High
m3/h
570 654
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 45
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 1,200
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 RH16A
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
OBH750

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-DM25VA
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
45
NC-10
MSZ-DM35VA
4NOISE CRITERIA CURVES
OBH750

7
MSZ-DM25VA MSZ-DM35VA Unit: mm
5OUTLINES AND DIMENSIONS
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
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
132
56 18
OBH750

8
MSZ-DM25VA - E1 , ER1 MSZ-DM35VA - E1 , ER1
6WIRING DIAGRAM
OBH750

9
MSZ-DM25VA MSZ-DM35VA
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
OBH750

10
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, 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.
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modif cation Same as at left Same as at left Same as at left
No. 2 unit – Cut J1 Same as at left Same as at left
No. 3 unit – – Solder J2 Same as at left
No. 4 unit – – – Cut J1 and solder 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 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.
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”. Cut “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
STOP/OPERATE/ (OFF/
ON) button 2 or 3 times at
first.
After finish modification,
put back the batteries then
press the RESET button.
MSZ-DM25VA MSZ-DM35VA
J2 J1
8SERVICE FUNCTIONS
OBH750