SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL |
No. OBH555 |
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Models
MSZ-SF15VA - E1
MSZ-SF20VA - E1
MSZ-SF15VA - E1 MSZ-SF20VA - E1
Outdoor unit service manual
MXZ-B·VA Series (OBH554)
MXZ-8A140A (OC316)
CONTENTS
1.TECHNICAL CHANGES ··································· 2
2.PART NAMES AND FUNCTIONS····················· 3
3.SPECIFICATION················································ 4
4.NOISE CRITERIA CURVES ······························ 5
5.OUTLINES AND DIMENSIONS ························ 6
6.WIRING DIAGRAM············································ 7
7.REFRIGERANT SYSTEM DIAGRAM ··············· 8
8.SERVICE FUNCTIONS ····································· 9
9.MICROPROCESSOR CONTROL ····················11
10.TROUBLESHOOTING····································· 17
11.DISASSEMBLY INSTRUCTIONS···················· 29
PARTS CATALOG (OBB555)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
1 TECHNICAL CHANGES
MSZ-SF15VA - E1 MSZ-SF20VA - E1
1. New model
2
2 PART NAMES AND FUNCTIONS
MSZ-SF15VA MSZ-SF20VA
Front panel
Air filter
Air inlet |
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Remote controller |
Horizontal vane |
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Air outlet |
Emergency operation switch (E.O. SW) |
Heat exchanger |
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Operation |
Remote control |
indicator lamp |
receiving section |
ACCESSORIES |
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Installation plate |
1 |
Installation plate fixing screw 4 × 25 mm |
5 |
Remote controller holder |
1 |
Fixing screw for 3.5 × 16 mm (Black) |
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Battery (AAA) for remote controller |
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Wireless remote controller |
1 |
Felt tape (Used for left or left-rear piping) |
1 |
3
3 |
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SPECIFICATION |
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Indoor model |
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MSZ-SF15VA |
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MSZ-SF20VA |
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Power supply |
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Single phase 230 V, 50 Hz |
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Electrical data |
Power |
Cooling |
W |
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17 |
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19 |
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current 1 |
Heating |
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0.17 |
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0.19 |
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A |
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input |
1 |
Heating |
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17 |
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19 |
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Running |
Cooling |
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0.17 |
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0.19 |
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Fan motor |
Model |
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RC0J40 |
-FM |
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1 |
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Heating |
A |
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0.17 |
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0.19 |
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Current |
Cooling |
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0.17 |
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0.19 |
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Dimensions W × H × D |
mm |
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760 × 250 × 168 |
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Weight |
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kg |
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7.7 |
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Air direction |
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5 |
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Cooling |
Super High |
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384 |
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414 |
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High |
m3/h |
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330 |
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Low |
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234 |
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Med. |
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276 |
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ow |
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Silent |
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210 |
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fl |
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Air |
Heating |
Super High |
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408 |
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438 |
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High |
m3/h |
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360 |
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Low |
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264 |
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Med. |
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300 |
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Silent |
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222 |
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HeatingCooling |
Super High |
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40 |
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42 |
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Specialremarks |
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High |
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35 |
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Soundlevel |
Low |
dB(A) |
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26 |
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Med. |
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30 |
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Low |
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26 |
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Silent |
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21 |
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Super High |
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40 |
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42 |
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High |
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35 |
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Med. |
dB(A) |
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30 |
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Silent |
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21 |
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Cooling |
Super High |
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1,500 |
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1,600 |
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High |
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1,300 |
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speed |
Med. |
rpm |
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1,130 |
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Low |
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980 |
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Silent |
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900 |
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Fan |
Heating |
Super High |
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1,500 |
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1,600 |
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High |
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1,350 |
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Low |
rpm |
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1,030 |
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Med. |
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1,160 |
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Silent |
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910 |
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Fan |
speed |
regulator |
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5 |
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Remote controller model |
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SG10D |
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NOTE: Test conditions are based on ISO 5151. |
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Cooling: Indoor |
Dry-bulb temperature 27°C |
Wet-bulb temperature |
19°C |
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Outdoor Dry-bulb temperature 35°C |
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Heating: Indoor |
Dry-bulb temperature 20°C |
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Outdoor Dry-bulb temperature 7°C |
Wet-bulb temperature |
6°C |
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1 Measured under rated operating frequency. |
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2 For multi system. |
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Specifications and rating conditions of main electric parts |
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Fuse |
(F11) |
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T3.15AL250V |
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Horizontal vane motor |
(MV) |
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12 VDC |
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Varistor |
(NR11) |
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S10K300E2K1 |
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Terminal block |
(TB) |
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3P |
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4
4 NOISE CRITERIA CURVES
MSZ-SF15VA
FAN SPEED FUNCTION SPL(dB(A)) |
LINE |
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Super High |
COOLING |
40 |
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HEATING |
40 |
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BAR |
90 |
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0.0002 MICRO |
80 |
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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
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MSZ-SF20VA |
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FAN SPEED |
FUNCTION |
SPL(dB(A)) |
LINE |
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Super High |
COOLING |
42 |
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HEATING |
42 |
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BAR |
90 |
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0.0002 MICRO |
80 |
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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
Test conditions |
INDOOR UNIT |
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Cooling: Dry-bulb temperature 27°C |
WALL |
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Wet-bulb temperature 19°C |
1m |
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Heating: Dry-bulb temperature 20°C |
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0.8m |
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MICROPHONE |
5
5 OUTLINES AND DIMENSIONS
MSZ-SF15VA MSZ-SF20VA |
Unit: mm |
11 20 Oblong hole
Installation plate |
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61 |
208 |
166 |
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42 |
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Indoor unit |
45 |
5 168
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11 20 Oblong hole |
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295 |
155 |
78 |
21.5 |
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167 |
187 |
209 |
145 |
145 |
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41 |
335 |
300 |
81 |
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Wall hole Ø65 |
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760 |
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740 |
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10 |
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Installation plate
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202 |
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Piping |
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250 |
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56 |
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8 |
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45 |
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56 |
505 |
179 |
41 |
56 |
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Drain hose |
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110 |
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Air out |
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60 |
18 |
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193 |
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47 |
56 |
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56 |
43 |
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Piping
Insulation Liquid line Gas line
Drain hose
Ø35 O.D
Ø6.35-0.39m (Flared connection Ø 6.35)
Ø9.52-0.34m (Flared connection Ø9.52)
Insulation Ø28 Connected part Ø16 O.D
6
6 WIRING DIAGRAM
MSZ-SF15VA MSZ-SF20VA
7
7 REFRIGERANT SYSTEM DIAGRAM
MSZ-SF15VA MSZ-SF20VA |
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Unit: mm |
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Refrigerant pipe ø9.52 |
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(with heat insulator) |
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Indoor coil |
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Indoor |
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thermistor |
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heat |
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RT12 (main) |
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exchanger |
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Flared connection |
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Indoor coil thermistor RT13 (sub)
Room temperature thermistor
RT11
Flared connection
Refrigerant pipe ø6.35 (with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
8
8 SERVICE FUNCTIONS
MSZ-SF15VA MSZ-SF20VA
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 minutes → 3 seconds (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:
J1 J2
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.
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 |
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No. 4 unit |
— |
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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 is turned OFF, or the power supply is shut down. Please conduct the above setting once again after the power has restored.
9
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 release “AUTO RESTART FUNCTION”
Turn off the main power for the unit.
Solder the jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 10-7.)
R111
CN112 |
CN211 |
D
JR07
IC112
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CN111 |
Indoor electronic |
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control P.C. board |
CN151 |
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.
10