Mitsubishi Electric MSZ-HC25VA 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 ··············· 9
8. SERVICE FUNCTIONS ··································· 10
9. MICROPROCESSOR CONTROL ··················· 12
10. TROUBLESHOOTING····································· 17
11. DISASSEMBLY INSTRUCTIONS ···················· 29
MSZ-HC25VA - E1
MSZ-HC35VA - E1
MSZ-HC35VA - E2
MSZ-HC35VAB - E1
MSZ-HC35VAB - E2
Outdoor unit service manual
MUZ-HC·VA Series (OBH467)
SERVICE MANUAL No. OBH466
REVISED EDITION-B
INDOOR UNIT
PARTS CATALOG (OBB466)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision B:
• MSZ-HC35VA- E2 and MSZ-HC35VAB- E2
have been added.
Please void OBH466 REVISED EDITION-A.
SPLIT-TYPE AIR CONDITIONERS
Models

2
Revision A:
• 10. TROUBLESHOOTING has been corrected.
• Color of lead wire (indoor fan motor : sensor part) of 10-5. ”Trouble criterion of main parts” has been corrected.
• 10-6.” Check of indoor fan motor” has been corrected. [MSZ-HC25]
Revision B:
• MSZ-HC35VA- E2 and MSZ-HC35VAB- E2 have been added.
Indoor coil thermistor (RT13) has been added.

3
MSZ-HA25VA - E1 →MSZ-HC25VA - E1
MSZ-HA35VA - E1 →MSZ-HC35VA - E1
MSZ-HA35VA - E1 →MSZ-HC35VAB - E1
1. Indoor fan motor has been changed. (DC AC) [MSZ-HC25]
2. Indoor heat exchanger has been changed. [MSZ-HC35]
3. Indoor electronic control P.C. board has been changed.
MSZ-HC35VA - E1 →MSZ-HC35VA - E2
MSZ-HC35VAB - E1 →MSZ-HC35VAB - E2
1. Wiring diagram has been changed.
1TECHNICAL CHANGES

4
Air outlet
Vertical vane
Air inlet
Operation Indicator
lamp
Front panel
Air filter (Anti-mold)
Horizontal vane
Remote controller
Remote control
receiving section
Emergency operation switch (E.O. SW)
ACCESSORIES
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
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

5
3SPECIFICATION
Indoor model MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
Function Cooling Heating Cooling Heating Cooling Heating
Power supply Single phase, 230 V, 50 Hz
Electrical
data
Running current 1 A 0.22
Power input 1 W 40 23
Fan motor Model RC4V18-BA or CA RC0J40-ED
Current 1 A 0.22
Dimensions W × H × D mm 788×295×225
Weight kg 9
Special remarks
Air flow (Super High) m3/h 630 546 612 552 612 552
(High/Med./Low) 522/420/318 468/390/306 504/408/312 480/402/294 504/408/312 480/402/294
Air direction 4
Sound
level
(Super High) dB(A) 43
(High/Med./Low) 38/32/26
Fan
speed
(Super High) rpm 1,110 980 1,140 1,050 1,140 1,050
(High/Med./Low) 950/800/650 870/750/630 980/830/680 940/820/660 980/830/680 940/820/660
Fan speed regulator 4
Remote controller model MP06B
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
Refrigerant piping length (one way) : 5 m
1 Measured under rated operating frequency.
Specifications and rating conditions of main electric parts
Fuse (F11) T3.15AL250V
Horizontal vane motor (MV) 12 VDC
Varistor
(NR11) S10K320E3K1 (ERZV14D471)
Terminal block (TB) 3P

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
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION SPL(dB(A)) LINE
Super High
FAN SPEED
HEATING
43
43
MSZ-HC25VA
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
43
43
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
MSZ-HC35VA MSZ-HC35VAB
4NOISE CRITERIA CURVES

7
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB Unit : mm
50
42
58
42
60753 128
295
58
42
2255
42
57
7459
41.5
214
235
253.5 18.5
320335 155 155
21540.5 254.5
5959 225 225
2
119
137
8
100
57
140
18
Air in
Air out
Installation plate
Piping
Drain hose
11 × 26 Oblong hole
Installation plate
Indoor unit Wall hole ø65
788
11 × 20 Oblong hole
MSZ-HC25VA
5OUTLINES AND DIMENSIONS
6WIRING DIAGRAM
Piping
Insulation ø35 O.D
Liquid line ø6.35 - 0.5 m (Flared connection ø6.35)
Gas line ø9.52 - 0.43 m (Flared connection ø9.52)
Drain hose Insulation ø28 O.D Connected part ø16 O.D

8
MSZ-HC35VA- E1 MSZ-HC35VAB- E1
MSZ-HC35VA- E2 MSZ-HC35VAB- E2

9
MSZ-HC25VA MSZ-HC35VA- E1 MSZ-HC35VAB- E1
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
Unit : mm
MSZ-HC35VA- E2 MSZ-HC35VAB- E2
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
7REFRIGERANT SYSTEM DIAGRAM

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, 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.)
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 twice or 3
times at first.
After finish modification,
put back the batteries then
press the RESET button.
MSZ-HC25VA MSZ-HC35VA MSZ-HC35VAB
J2
J1
8SERVICE FUNCTIONS