Mitsubishi Electric MSZ-HJ25VA-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············································ 7
7. REFRIGERANT SYSTEM DIAGRAM··············· 8
8. SERVICE FUNCTIONS ····································· 9
9. MICROPROCESSOR CONTROL ····················11
10. TROUBLESHOOTING····································· 15
11. DISASSEMBLY INSTRUCTIONS···················· 27
MSZ-HJ25VA -E1
MSZ-HJ35VA -E1
MSZ-HJ50VA -E1
Outdoor unit service manual
MUZ-HJ·VA Series (OBH648)
SERVICE MANUAL No. OBH647
REVISED EDITION-A
INDOOR UNIT
PARTS CATALOG (OBB647)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
SPLIT-TYPE AIR CONDITIONERS
Models
Revision A:
• MSZ-HJ50VA- E1 has been added.
Please void OBH647.

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.
Revision A:
• MSZ-HJ50VA- E1 has been added.
OBH647A

3
1TECHNICAL CHANGES
MSZ-HJ25VA - E1
MSZ-HJ35VA - E1
MSZ-HJ50VA - E1
1. New model
OBH647A

4
Operation indicator lamp
Remote control
receiving section
Emergency
operation switch
Horizontal vane
Air inlet
Air filter
Front panel
Air outlet Heat exchanger
Emergency operation switch
Remote controller
ACCESSORIES
MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA
Installation plate 1
Installation plate fixing screw 4 ×25 mm 5
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 1
2PART NAMES AND FUNCTIONS
OBH647A

5
3SPECIFICATION
Indoor model MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA
Power supply Single phase 230 V, 50 Hz
Breaker Capacity A 10 12
Electrical data
Power input 1 (Total) Cooling W730 1,040 2,050
Heating 870 995 1,480
Running current 1
(Total) Cooling A3.7 4.9 9.0
Heating 4.2 4.8 6.6
Power factor 1 (Total) Cooling %85 92 99
Heating 90 90 97
Starting current 1 (Total) A 4.2 4.9 9.0
Fan motor
Model RC0J40-EF
Current 1 Cooling A0.19 0.24 0.27
Heating 0.20 0.22 0.34
Dimensions W × H × D mm 799 × 290 × 232
Weight kg 9
Special remarks
Air direction 5
Airflow
Cooling
Super High
m3/h
571 654 772
High 438 470 667
Med. 328 341 547
Low 227 227 380
Heating
Super High
m3/h
598 619 861
High 451 451 667
Med. 328 328 497
Low 208 208 364
Sound level
Cooling
Super High
dB(A)
43 45 45
High 37 38 40
Med. 30 31 36
Low 22 22 28
Heating
Super High
dB(A)
43 44 47
High 37 37 41
Med. 30 30 34
Low 23 23 27
Fan speed
Cooling
Super High
rpm
1,080 1,200 1,120
High 880 930 1,000
Med. 710 730 860
Low 550 550 660
Heating
Super High
rpm
1,120 1,150 1,220
High 900 900 1,000
Med. 710 710 800
Low 520 520 640
Fan speed regulator 4
Remote controller model MP13A
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) S10K320E3K1 (ERZV14D471)
Terminal block (TB) 5P
OBH647A

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-HJ25VA
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-HJ35VA
4NOISE CRITERIA CURVES
MSZ-HJ50VA
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
45
47
NC-10
OBH647A

7
MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA Unit : mm
MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA
5OUTLINES AND DIMENSIONS
6WIRING DIAGRAM
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
140
57 18
46
Air in
Installation plate
Piping
Drain hose
Air out
11×26 Oblong hole 11×20 Oblong hole
Installation plate
Indoor unit
Wall hole Φ65
In case of left, left back,or left under piping (using spacer),
108.5 or more
7 or more
33.5 or more
40 or more
20 or more
Piping
Insulation Φ35 O.D
Liquid line Φ6.35 - 0.39m (Flared connection Φ6.35)
Gas line Φ9.52 - 0.34m (Flared connection Φ9.52)
Drain hose
InslationΦ28 Connected part Φ16 O.D active length 370
MSZ-HJ25/35VA
MSZ-HJ50VA
Piping
Insulation Φ37 O.D
Liquid line Φ6.35 - 0.39m (Flared connection Φ6.35)
Gas line Φ9.52 - 0.34m (Flared connection Φ12.7)
Drain hose
InslationΦ28 Connected part Φ16 O.D active length 370
OBH647A

8
MSZ-HJ25VA MSZ-HJ35VA
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
MSZ-HJ50VA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe ø12.7
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Indoor coil
thermistor
RT12
Indoor coil
thermistor
RT13
7REFRIGERANT SYSTEM DIAGRAM
OBH647A

9
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 short circuiting 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 short circuiting the timer short mode point.)
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 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 has turned OFF, or the power supply has 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 2 or 3 times at
first.
After finish modification,
put back the batteries then
press the RESET button.
MSZ-HJ25VA MSZ-HJ35VA MSZ-HJ50VA
J2
J1
8SERVICE FUNCTIONS
OBH647A

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
cancelled.
• 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.
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.)
OBH647A