SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
No. OBH488
SERVICE MANUAL
Wireless type
Models
MSZ-FD25VA - E1
MSZ-FD25VAS - E1
MSZ-FD35VA - E1
MSZ-FD35VAS - E1
Outdoor unit service manual
MUZ-FD·VA Series(OBH489)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)
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······································20
11. DISASSEMBLY INSTRUCTIONS·····················36
PARTS CATALOG (OBB488)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
2
1 TECHNICAL CHANGES
MSZ-FD25VA - E1 MSZ-FD25VAS - E1 MSZ-FD35VA - E1 MSZ-FD35VAS - E1
1. New model
3
2 PART NAMES AND FUNCTIONS
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
AREA lamp |
POWER lamp |
CLEAN lamp |
PLASMA lamp |
Operation Indicator |
Remote control |
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lamp |
receiving section |
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Front panel |
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Air filter |
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Air inlet |
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Remote controller |
Plasma anti-allergy |
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enzyme filter |
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Plasma electrode |
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unit |
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Plasma deodorizing |
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filter |
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i-see sensor |
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Air outlet |
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Fan guard |
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Fan |
Heat exchanger |
Emergency operation |
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Horizontal vane |
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switch |
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Vertical vane |
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AREA lamp indicate AREA setting
In AREA setting, the horizontal air flow direction changes automatically according
to the detection of i-see Sensor which detects the floor/ wall temperature to air-condition the room evenly.
i-see control operation
i-see sensor constantly measure floor/wall temperature to automatically adjust to the set temperature by estimating the temperature
actually perceived by a person inside the room ("sensible temperature").
ACCESSORIES
1 |
Installation plate |
1 |
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2 |
Installation plate fixing screw 4 o 25 mm |
5 |
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3 |
Remote controller holder |
1 |
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4 |
Fixing screw for 3 3.5 o 1.6 mm (Black) |
2 |
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5 |
Battery (AAA) for remote controller |
2 |
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6 |
Wireless remote controller |
1 |
7 |
Felt tape (Used for left or left-rear piping) |
1 |
4
3 SPECIFICATION
Indoor model |
MSZ-FD25VA |
MSZ-FD25VAS |
MSZ-FD35VA |
MSZ-FD35VAS |
Power supply
Single phase 230 V, 50 Hz
Electrical data
Special remarks
Power input 1 |
Cooling |
W |
26 |
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28 |
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Heating |
31 |
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33 |
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Running current 1 |
Cooling |
A |
0.25 |
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0.27 |
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Heating |
0.30 |
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0.32 |
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Fan motor current 1 |
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Cooling |
A |
0.25 |
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0.27 |
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Heating |
0.30 |
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0.32 |
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Fan motor model |
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RCOJ40-GF |
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Dimensions WOHOD |
mm |
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798O295O257 |
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Weight |
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kg |
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12 |
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Color |
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PURE WHITE |
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SILVER |
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PURE WHITE |
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SILVER |
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Air direction |
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4 |
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Air flow |
Cooling |
K /h |
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672 |
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(Super High) |
Heating |
726 |
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750 |
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Air flow |
Cooling |
K /h |
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516/378/276 |
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(High/Med./Low) |
Heating |
552/402/270 |
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552/402/282 |
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Sound level |
Cooling |
dB(A) |
42 |
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43 |
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(Super High) |
Heating |
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Sound level |
Cooling |
dB(A) |
36/29/20 |
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36/29/21 |
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(High/Med./Low) |
Heating |
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Fan speed |
Cooling |
rpm |
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1,190 |
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(Super High) |
Heating |
1,270 |
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1,300 |
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Fan speed |
Cooling |
rpm |
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950/740/580 |
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(High/Med./Low) |
Heating |
1,010/780/570 |
1,010/780/590 |
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Fan speed regulator |
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4 |
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Remote controller model |
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KM08A |
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NOTE : Test conditions are based on ISO 5151 |
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Cooling : Indoor |
Dry-bulb temperature 27 : |
Wet-bulb temperature 19 : |
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Outdoor Dry-bulb temperature 35 : |
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Heating : Indoor |
Dry-bulb temperature 20 : |
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Outdoor Dry-bulb temperature 7 : |
Wet-bulb temperature 6 : |
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Refrigerant piping length (one way): 5 m |
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1 Measured under rated operating frequency. |
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Specifications and rating conditions of main electric parts |
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Fuse |
(F11) |
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250 V 3.15 A |
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i-see Sensor motor |
(MT) |
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MP20Z 12 VDC 300 " (at 25 ˚C) |
Horizontal vane motor |
(MV1) |
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MSFBC20C29 12 VDC 350 " (at 25 ˚C) |
Vertical vane motor |
(MV2) |
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MSBPC20M11 12 VDC 300 " (at 25 ˚C) |
Varistor |
(NR11) |
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S10K320E3K1 |
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i-see Sensor |
(RR) |
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A2TPMI 23A FOV50 OBA060 P8L1 J4S |
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Terminal block |
(TB) |
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3P |
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5
4 NOISE CRITERIA CURVES
MSZ-FD25VA
MSZ-FD25VAS
FAN SPEED FUNCTION SPL(dB(A)) |
LINE |
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Super High |
COOLING |
42 |
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HEATING |
43 |
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BAR |
90 |
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MICRO |
80 |
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0.0002 |
70 |
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NC-70 |
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dB re |
60 |
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LEVEL, |
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NC-60 |
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50 |
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PRESSURE |
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NC-50 |
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40 |
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NC-40 |
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SOUND |
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30 |
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BAND |
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NC-30 |
20 |
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OCTAVE |
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NC-10 |
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NC-20 |
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10 |
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125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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63 |
BAND CENTER FREQUENCIES, Hz
MSZ-FD35VA
MSZ-FD35VAS
FAN SPEED FUNCTION SPL(dB(A)) |
LINE |
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Super High |
COOLING |
43 |
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HEATING |
43 |
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BAR |
90 |
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MICRO |
80 |
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0.0002 |
70 |
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NC-70 |
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dB re |
60 |
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LEVEL, |
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NC-60 |
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50 |
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PRESSURE |
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NC-50 |
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40 |
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NC-40 |
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SOUND |
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30 |
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BAND |
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NC-30 |
20 |
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OCTAVE |
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NC-20 |
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NC-10 |
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10 |
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125 |
250 |
500 |
1000 |
2000 |
4000 |
8000 |
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63 |
BAND CENTER FREQUENCIES, Hz
Test conditions
Cooling : Dry-bulb temperature 27 : Wet-bulb temperature 19 : Heating : Dry-bulb temperature 20 :
INDOOR UNIT
WALL
1 m
0.8 m
MICROPHONE
6
5 OUTLINES AND DIMENSIONS
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
69
43
11 X 26 Oblong hole
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Installation plate |
64 |
225 |
225 |
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798 |
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785 |
6.5 |
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254 |
212.5 |
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47 |
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41 |
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155 |
155 |
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Indoor unit |
54 |
345 |
330 |
Air in |
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Installation plate |
257 |
5 |
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Piping |
295 |
56 |
7 |
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55 |
688 |
55 |
100 |
43 |
Drain hose |
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85 |
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58 |
19 |
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97 |
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Air out
Unit : mm
11 X 20 Oblong hole
64 |
21.5 |
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211.5 |
231.5 |
253 |
3 |
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42 |
69 |
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Wall hole [65
159 Piping
Insulation
Liquid line
Gas line
Drain hose
[35 O.D
[6.35 - 0.5 m (Flared connection [6.35)
[9.52 - 0.43 m (Flared connection [9.52)
Insulation [28 O.D Connected part [16 O.D
6 WIRING DIAGRAM
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
7
7 REFRIGERANT SYSTEM DIAGRAM
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
Unit : mm
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Refrigerant pipe [9.52 |
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(with heat insulator) |
Indoor |
Indoor coil |
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thermistor |
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heat |
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RT12 (main) |
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exchanger |
Flared connection |
Indoor coil thermistor RT13 (sub)
Room temperature thermistor
RT11
Flared connection
Refrigerant pipe [6.35 (with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
8
8 SERVICE FUNCTIONS
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
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.)
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 :
NOTE : For modification, take out the batteries and press the OPERATE/STOP(ON/OFF) button twice or 3 times at first.
After modification, put back the batteries then press
the RESET button.
J1 J2
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.
Table 1
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1 unit operation |
2 units operation |
3 units operation |
4 units operation |
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No. 1 unit |
No modification |
Same as at left |
Same as at left |
Same as at left |
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No. 2 unit |
– |
Solder J1 |
Same as at left |
Same as at left |
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No. 3 unit |
– |
– |
Solder J2 |
Same as at left |
No. 4 unit |
– |
– |
– |
Solder both J1 and J2 |
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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 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 restored.
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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
1 If the main power has been cut, the operation settings remain.
2 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 release “AUTO RESTART FUNCTION”
1Turn OFF the main power for the unit.
2Solder the Jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 10-7.)
CN130
IC156
CN212 CN1R1 CN211
JR07
CN1U1 CN151 CN1T1 CN112
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.
8-4. REMOTE CONTROLLER
Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.
Slide swich
Where is the indoor unit installed in your room?
Area |
Left |
Center |
Right |
Position of |
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the slide |
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switch |
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Display on |
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the remote |
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controller |
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Installed at left, if the |
Installed at right, if the |
distance is not more |
distance is not more |
than 50 cm. |
than 50 cm. |
(Left) |
(Center) |
(Right) |
Is the indoor unit installed at right, left or center?
NOTE:If the indoor unit is installed more than 50 cm away from the side walls, cabinets or other nearby objects, set the slide switch to the “center” position.
10
9 MICROPROCESSOR CONTROL
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section |
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OPERATE/STOP |
FAN SPEED CONTROL button |
VANE CONTROL button |
(ON/OFF) button |
OPERATION SELECT button |
OFF TIMER button |
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ECONO COOL button |
ON TIMER button |
Temperature buttons |
PLASMA button |
TIME SET buttons |
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FORWARD button |
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CLEAN button |
BACKWARD button |
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i-see button |
WIDE VANE button |
(Vertical vane button)
AREA button
CLOCK SET button
RESET button
Indication of remote controller model is on back
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the remote controller with beeps.
INDOOR UNIT LAMP
The lamps at the center of the indoor unit indicates the operation state.
Lamp |
Operation state |
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AREA |
Refer to 9-7. |
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POWER |
Lamp lights during operation. |
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Lamp blinks in abnormal condition. |
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CLEAN |
Lamp lights during clean operation. |
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Refer to 9-9. |
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PLASMA |
Lamp lights during PLASMA operation. |
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Refer to 9-8. |
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9-1. COOL ( ) OPERATION
(1)Press OPERATE/STOP(ON/OFF) button.
POWER lamp of the indoor unit turns on with a beep tone.
(2)Select COOL mode with OPERATION SELECT button.
(3)Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 16 ~ 31 °C.
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting.
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger rises.
2.Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
9-2. DRY ( ) OPERATION
(1)Press OPERATE/STOP(ON/OFF) button.
POWER lamp of the indoor unit turns on with a beep tone.
(2)Select DRY mode with OPERATION SELECT button.
(3)The set temperature is determined from the initial room temperature.
1.Coil frost prevention
Coil frost prevention is as same as COOL mode. (9-1.1.)
2.Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (9-1.2.)
9-3. HEAT ( ) OPERATION
(1)Press OPERATE/STOP(ON/OFF) button.
POWER lamp of the indoor unit turns on with a beep tone.
(2)Select HEAT mode with OPERATION SELECT button.
(3)Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 16 ~ 31 °C.
1.Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2.High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat exchanger falls.
3.Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts. This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
9-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.
Mode selection
(1)Initial mode
When unit starts the operation with AUTO operation from off;
•If the room temperature is higher than the set temperature, operation starts in COOL mode.
•If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.
(2)Mode change
COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2 °C below the set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 °C above the set temperature.
NOTE 1
If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in (AUTO), cannot change over to the other operating mode (COOL HEAT) and becomes a state of standby. Refer to NOTE 2 “FOR MULTI SYSTEM AIR CONDITIONER”.
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