Revision B:
• MSZ-A•NA - 1 and MSY-A•NA- 1 have been
added.
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
Please void OB450 REVISED EDITION-A.
INDOOR UNIT
SERVICE MANUAL
No. OB450
REVISED EDITION-B
Wireless type Models
MSZ-A09NA MSZ-A09NA - 1 MSZ-A12NA MSZ-A12NA - 1 MSZ-A15NA MSZ-A15NA - 1 MSZ-A17NA MSZ-A17NA - 1
MSZ-A24NA MSZ-A24NA - 1 MSY-A15NA MSY-A15NA - 1 MSY-A17NA MSY-A17NA - 1 MSY-A24NA MSY-A24NA - 1
Outdoor unit service manual MUZ-A·NA Series (OB451) MXZ-A·NA Series (OB444)
MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA
MSZ-A17NA
CONTENTS
1.TECHNICAL CHANGES ····································2
2.PART NAMES AND FUNCTIONS······················3
3.SPECIFICATION·················································4
4.OUTLINES AND DIMENSIONS ·························6
5.WIRING DIAGRAM ············································8
6.REFRIGERANT SYSTEM DIAGRAM ················9
7.SERVICE FUNCTIONS ····································10
8.TROUBLESHOOTING······································11
9.DISASSEMBLY INSTRUCTIONS ····················25
10.PARTS LIST······················································30 10-1. PARTS LIST·············································30 10-2. RoHS PARTS LIST ··································36
11.MICROPROCESSOR CONTROL·····················42
NOTE:
RoHS compliant products have <G> mark on the spec name plate. For servicing of RoHS compliant products, refer to the PARTS LIST (RoHS compliant).
Revision A :
• PARTS LIST has been revised. (10-1.8, 10-2.8)
Revision B :
•MSZ-A•NA- 1 and MSY-A•NA- 1 Remote controller has been changed.
1 TECHNICAL CHANGES
MSZ09UN MSZ-A09NA MSZ12UN MSZ-A12NA MSH15TN MSZ-A15NA MSH17TN MSZ-A17NA
MSH24WN MSZ-A24NA MS15TN MSY-A15NA MS17TN MSY-A17NA MS24WN MSY-A24NA
1.Control method between indoor and outdoor has been changed. 2.Indoor fan motor has been changed.
3.Signal of remote controller has been changed. (It is not available for conventional models.)
MSZ-A09NA MSZ-A09NA- 1 MSZ-A12NA MSZ-A12NA- 1 MSZ-A15NA MSZ-A15NA- 1 MSZ-A17NA MSZ-A17NA- 1
MSZ-A24NA MSZ-A24NA- MSY-A15NA MSY-A15NA- MSY-A17NA MSY-A17NA- MSY-A24NA MSY-A24NA-
1
1
1
1
1.Remote controller has been changed.
• Temperature indication function (_F/_C) has been added. (Refer to 11-10.)
Models |
Remote controller |
Temperature indication |
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MSZ-A09/12/15/17NA |
KM06A |
_F |
|
|
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MSZ-A09/12/15/17NA- |
KM07J |
_F/ _C |
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MSZ-A24NA |
KM06B |
_F |
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MSZ-A24NA- |
KM07K |
_F/ _C |
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MSY-A15/17NA |
KM06C |
_F |
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MSY-A15/17NA- |
KM07L |
_F/ _C |
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MSY-A24NA |
KM06D |
_F |
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MSY-A24NA- |
KM07M |
_F/ _C |
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|
• Timer indication has been changed. (AM/PM indication) 2.Conduit plate has been removed. (MSZ-A09/12/15/17,MSY-A15/17)
3.Conduit cover, terminal block cover and terminal block holder have been changed. (MSZ-A09/12/15/17,MSY-A15/17)
2
2 PART NAMES AND FUNCTIONS
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA
Panel
MSY-A15NA |
MSZ-A24NA |
MSY-A17NA |
MSY-A24NA |
Front panel
Air inlet
Heat exchanger
Air cleaning filter (Anti-Allergy Enzyme Filter, Blue bellows type)
Catechin air filter
Air outlet
Vertical vane
Remote controller
Horizontal vane
Line flow fan
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA
Operation section |
Display section |
(When the front panel is opened)
Operation Indicator lamp
Emergency operation switch |
Remote control |
|
receiving section |
MSZ-A24NA MSY-A24NA
Operation indicator lamp
Emergency operation switch
Remote control receiving section
ACCESSORIES
|
|
MSZ-A09/12/15/17NA |
MSZ-A09/12/15/17NA- 1 |
MSZ-A24NA |
|
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MSY-A15/17NA |
MSY-A15/17NA- 1 |
MSY-A24NA |
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1 |
Installation plate |
1 |
1 |
1 |
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2 |
Installation plate fixing screw 4 o 25 mm |
8 |
5 |
7 |
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3 |
Remote controller holder |
1 |
1 |
1 |
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|
4 |
Fixing screw for 3 o 3.5 o 1.6 mm (Black) |
2 |
2 |
2 |
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5 |
Battery (AAA) for remote controller |
2 |
2 |
2 |
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6 |
Wireless remote controller |
1 |
1 |
1 |
|
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7 |
Felt tape (Used for left or left-rear piping) |
1 |
1 |
1 |
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8 |
Conduit plate |
1 |
– |
– |
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3
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3 |
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SPECIFICATION |
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Item |
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Model |
MSZ-A09NA |
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MSZ-A12NA |
||||||
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Indoor unit model |
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MSZ-A09NA |
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MSZ-A12NA |
||||||||
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External finish |
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White |
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||||||
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Power supply |
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V, phase, Hz |
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208/230, 1, 60 |
|
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||||||
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Max.-fuse size |
(time delay)/ Disconnect switch |
A |
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15 |
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||||||
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Min. circuit ampacity |
|
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A |
1.0 |
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1.0 |
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Fan motor |
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F.L.A |
0.76 |
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|
0.76 |
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||||
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Airflow Low— Med.— High |
HEAT Dry |
|
CFM |
307-222-159 |
|
353-240-159 |
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COOL Dry (Wet) |
CFM |
307(275)-229(205)-152(134) |
|
353(318)-240(215)-152(134) |
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Moisture removal |
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|||||||||||||
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pt./h |
2.3 |
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3.2 |
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|||||||
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Sound level Low-Med.-High |
|
dB(A) |
22-33-38 |
|
22-34-42 |
|||||||||
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Cond. drain connection O.D. |
|
in. |
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5/8 |
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Dimensions |
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W |
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in. |
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30-11/16 |
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D |
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in. |
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8-1/4 |
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||||
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Weight |
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H |
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in. |
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11-3/4 |
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||||
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Ib. |
23 |
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23 |
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|||||
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Remote controller |
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Wireless type |
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|||||||
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Control voltage (by built-in transformer) |
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12-24V DC |
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Item |
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Model |
MSZ-A15NA |
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MSY-A15NA |
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MSZ-A17NA |
|
MSY-A17NA |
||
|
Indoor unit model |
|
|
|
MSZ-A15NA |
|
MSY-A15NA |
|
MSZ-A17NA |
|
MSY-A17NA |
||||
|
External finish |
|
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White |
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||||||
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Power supply |
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V, phase, Hz |
|
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208/230, 1, 60 |
|
|
||||||
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- |
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(time delay)/ Disconnect switch |
A |
|
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15 |
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|||
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Max. fuse size |
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Min. circuit ampacity |
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A |
1.0 |
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1.0 |
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Fan motor |
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F.L.A |
0.76 |
|
|
0.76 |
|
||||
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Airflow Low— Med.— High |
HEAT Dry |
|
CFM |
381-314-254 |
|
— |
|
381-314-254 |
|
— |
||||
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COOL Dry (Wet) |
CFM |
381(342)-328(293)-268(240) |
|
381(342)-328(293)-268(240) |
||||||||||
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Moisture removal |
|
|||||||||||||
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pt./h |
4.7 |
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5.1 |
|
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Sound level Low-Med.-High (Cooling/Heating) |
dB(A) |
34-40-45/34-38-44 |
|
34-40-45/ — |
|
34-40-46/34-38-44 |
|
34-40-46/ — |
||||||
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Cond. drain connection O.D. |
|
in. |
|
|
|
5/8 |
|
|
||||||
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Dimensions |
|
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W |
|
in. |
|
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30-11/16 |
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||||
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D |
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in. |
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8-1/4 |
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Weight |
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H |
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in. |
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11-3/4 |
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Ib. |
23 |
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23 |
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Remote controller |
|
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Wireless type |
|
|||||||
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Control voltage (by built-in transformer) |
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12-24V DC |
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Item |
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Model |
MSZ-A24NA |
|
MSY-A24NA |
||||||
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Indoor unit model |
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MSZ-A24NA |
|
MSY-A24NA |
||||||||
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External finish |
|
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White |
|
||||||
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Power supply |
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V, phase, Hz |
|
|
208/230, 1, 60 |
|
|
||||||
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Max.-fuse size |
(time delay)/ Disconnect switch |
A |
|
|
|
15 |
|
|
||||||
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Min. circuit ampacity |
|
|
A |
1.0 |
|
|
1.0 |
|
||||||
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Fan motor |
|
|
|
|
F.L.A |
0.76 |
|
|
0.76 |
|
||||
|
Airflow Low— Med.— High |
HEAT Dry |
|
CFM |
568-486-296 |
|
— |
|
|||||||
|
COOL Dry (Wet) |
CFM |
568(508)-431(385)-296(265) |
|
568(508)-431(385)-296(265) |
||||||||||
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Moisture removal |
|
|||||||||||||
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|
pt./h |
7.3 |
|
|
7.3 |
|
|||||||
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Sound level Low-Med.-High (Cooling/Heating) |
dB(A) |
34-40-49/34-40-48 |
|
34-40-49/ — |
||||||||||
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Cond. drain connection O.D. |
|
in. |
|
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|
5/8 |
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||||||
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Dimensions |
|
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W |
|
in. |
|
|
43-5/16 |
|
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||||
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D |
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in. |
|
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10-1/4 |
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|||||
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Weight |
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H |
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in. |
|
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12-13/16 |
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||||
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Ib. |
37 |
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37 |
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Remote controller |
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Wireless type |
|
|||||||
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Control voltage (by built-in transformer) |
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12-24V DC |
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|||||||||
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NOTE : Test conditions are based on ARI 210/240. |
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1 : Rating conditions(cooling) — |
Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB) |
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(heating) — |
Indoor : 70˚FDB, 60˚FWB, Outdoor : 47˚FDB, 43˚FWB |
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2 : |
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(heating) — |
Indoor : 70˚FDB, 60˚FWB, Outdoor : 17˚FDB, 15˚FWB |
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4
3-1. OPERATING RANGE
(1) POWER SUPPLY
Model |
Rated voltage |
Guaranteed Voltage |
||||
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MSZ-A09NA MSY-A15NA |
|
Min. 198V 208V 230V Max. 253V |
||||
MSZ-A12NA MSY-A17NA |
208/230V 1phase 60Hz |
|||||
MSZ-A15NA MSY-A24NA |
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MSZ-A17NA |
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MSZ-A24NA |
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(2) OPERATION
|
Intake air |
|
Indoor |
|
Outdoor |
Function |
temperature |
|
|
||
|
|
|
|
||
|
DB (˚F) |
WB (˚F) |
DB (˚F) |
WB (˚F) |
|
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Condition |
||||
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|
|
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Standard temperature |
80 |
67 |
95 |
— |
|
Maximum temperature |
95 |
71 |
115 |
— |
Cooling |
Minimum temperature |
67 |
57 |
14 |
— |
|
|||||
|
Maximum humidity |
|
78% |
|
— |
|
Standard temperature |
70 |
60 |
47 |
43 |
Heating |
Maximum temperature |
80 |
67 |
75 |
65 |
|
Minimum temperature |
70 |
60 |
14 |
13 |
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
Model |
Mode |
Function |
Air flow |
Air speed |
Coverage |
|
|
|
|
(CFM) |
(ft./sec.) |
range (ft.) |
|
|
HEAT |
Dry |
307 |
16.8 |
23.4 |
|
MSZ-A09NA |
COOL |
Dry |
307 |
16.8 |
23.4 |
|
|
Wet |
275 |
15.1 |
21.0 |
||
|
|
|||||
|
HEAT |
Dry |
353 |
19.3 |
26.7 |
|
MSZ-A12NA |
COOL |
Dry |
353 |
19.3 |
26.7 |
|
|
Wet |
318 |
17.4 |
24.1 |
||
|
|
|||||
MSZ-A15NA |
HEAT |
Dry |
381 |
20.9 |
28.8 |
|
MSZ-A15NA |
COOL |
Dry |
381 |
20.9 |
28.8 |
|
MSY-A15NA |
Wet |
342 |
18.8 |
26.0 |
||
|
||||||
MSZ-A17NA |
HEAT |
Dry |
381 |
20.9 |
28.8 |
|
MSZ-A17NA |
COOL |
Dry |
381 |
20.9 |
28.8 |
|
MSY-A17NA |
Wet |
342 |
18.8 |
26.0 |
||
|
||||||
MSZ-A24NA |
HEAT |
Dry |
568 |
20.2 |
34.4 |
|
MSZ-A24NA |
COOL |
Dry |
568 |
20.2 |
34.4 |
|
MSY-A24NA |
Wet |
508 |
18.1 |
30.9 |
||
|
●The air coverage range is the figure up to the position where the air speed is 1 ft./sec., when air is blown out horizontally from the unit properly at the High speed position.
The coverage range should be used only as a general guideline since it varies according to the size of the room and furniture arranged inside the room.
5
4 OUTLINES AND DIMENSIONS
MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA
MSZ-A17NA
30-11/16
11-3/4
2-1/8 |
24-9/16 |
2-5/16 3/4
6-1/4
Unit : inch
Conduit plate(MSZ-A•NA- |
and MSY-A•NA- |
are excluded.) |
|
|
|
|||
7/16x1 Oblong hole |
7/16x13/16 Oblong hole |
|
|
9/16 |
|
|||
Installation plate |
2-3/16 |
8-7/8 |
|
8-7/8 |
2-3/16 |
|
||
8-7/16 |
10-1/8 |
|
|
7/8 hole |
7/8 8-7/16 |
9-3/16 |
10-3/4 |
11-5/16 |
|
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|
||||||
1-5/8 |
|
6-1/8 |
6-1/8 |
|
11/16 |
|
1/8 |
|
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|
|
1-3/4 |
|
|
|||
2-3/16 |
13-3/16 |
|
12-5/8 |
2-3/4 |
|
|||
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|
- |
|
|
||||
Indoor unit |
|
1 |
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||||
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||
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Air in |
|
|
Wall hole [2-9/16 |
|||
|
|
8-1/4 |
3/16 |
|
|
|
|
Installation plate
Liquid line [1/4 19-11/16 {Gas line [3/8 16-15/16 Insulation [1-3/8 O.D
[3/4 I.D
|
Drain hose [5/8 |
4 |
(Connected part O.D) |
|
Air out |
|
Insulation [1-1/8 |
6
MSZ-A24NA |
Unit : inch |
MSY-A24NA |
|
Installation plate 3-7/8
42-1/16
|
1-7/8 |
16-5/16 |
|
3-7/8 |
|
43-5/16 |
|
10-1/4 |
Air in |
|
12-13/16
2-3/16 |
31-1/8 |
9-15/16 |
|
|
Air out |
2-5/16 |
3/4 |
|
6-1/4 |
|
|
Wireless remote controller |
|
Indoor unit |
|
|
|
|
6-13/16 |
|
5/16 |
|
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|
10-1/16 |
12-3/8 |
16-5/16 |
1/8 |
1-7/8 |
|
6-13/16 |
|
|
Wall hole [3 3/16
Installation plate
{Liquid line [1/4 19-11/16 Gas line [5/8 16-15/16 Insulation [1-15/16 O.D
[1-1/4 I.D
Drain hose [5/8 (Connected part O.D)
Insulation [1-1/8
7
5 WIRING DIAGRAM
MSZ-A09NA MSY-A15NA
MSZ-A12NA MSY-A17NA
MSZ-A15NA
MSZ-A17NA
MSZ-A24NA
MSY-A24NA
8
6 REFRIGERANT SYSTEM DIAGRAM
MSZ-A09NA
MSZ-A12NA
|
Refrigerant pipe [3/8 |
|
|
(with heat insulator) |
|
Indoor |
Indoor coil |
|
thermistor |
||
heat |
RT12(main) |
|
exchanger |
||
Flared connection |
Indoor coil thermistor RT13(sub)
Room temperature thermistor
RT11
Flared connection
Refrigerant pipe [1/4 (with heat insulator)
MSZ-A24NA
MSY-A24NA |
Refrigerant pipe [5/8 |
|
(with heat insulator) |
|
Indoor coil |
Indoor |
thermistor |
heat |
RT12(main) |
|
|
exchanger |
Distributor |
|
Flared connection |
Indoor coil thermistor RT13(sub)
Room temperature thermistor
RT11
Flared connection
Refrigerant pipe [1/4 (with heat insulator)
MSZ-A15NA |
MSY-A15NA |
Unit:inch |
MSZ-A17NA MSY-A17NA |
|
|
|
Refrigerant pipe [1/2 |
|
|
(with heat insulator) |
|
Indoor |
Indoor coil |
|
thermistor |
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heat |
RT12(main) |
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exchanger |
Distributor |
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Flared connection |
Indoor coil thermistor RT13(sub)
Room temperature thermistor
RT11
Flared connection
Refrigerant pipe[1/4 (with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
9
7 SERVICE FUNCTIONS
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA
MSY-A15NA MSY-A17NA MSY-A24NA
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 8-7.)
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.)
7-2. 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 :
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NOTE : For modification, take out |
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the batteries and press the |
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OPERATE/STOP(ON/OFF) |
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button twice or 3 times at |
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first. |
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After finish modification, |
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put back the batteries then |
J1 J2 |
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 |
– |
– |
– |
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.
10
7-3. 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. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically.
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 of the unit.
2Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 8-7.)
MSZ-A09/12/15/17NA |
MSZ-A24NA |
MSY-A15/17NA |
MSY-A24NA |
CN211 |
CN211 |
JR07
BZ
CN151 CN112
JR07
BZ
CN152
CN101
CN151 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 TROUBLESHOOTING
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA MSY-A17NA MSY-A24NA
8-1. Cautions on troubleshooting
1.Before troubleshooting, check the following
1)Check the power supply voltage.
2)Check the indoor/outdoor connecting wire for mis-wiring.
2.Take care of the following during servicing
1)Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
2)Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board.
3)When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.
4)When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring |
Housing point |
11
3.Troubleshooting procedure
1)First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2)Before servicing check that the connector and terminal are connected properly.
3)If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.
4)When troubleshooting, refer to 8-2., 8-3. and 8-4.
4.How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
1Remove the front lid and insert batteries. Then reattach the front lid.
2Press RESET button with tip end of ball point pen or the like, and then use the remote controller.
Insert the negative pole of the |
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batteries first. Check if the polarity |
RESET button |
of the batteries is correct. |
NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.
2.This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement.
INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT : MXZ series
Multi system air conditioner can connect two or more indoor units with one outdoor unit.
•Unit won’t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not connect indoor units beyond the outdoor unit capacity.
Operation indicator lamp flashes as shown in the figure below.
•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode.
OPERATION INDICATOR Lighted
Blinking
Not lighted
•When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 10 minutes) to blow out the warm air.
•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
12
8-2. Failure mode recall function
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (8-4.) disappears, the memorized failure details can be recalled.
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Those figures show about MSZ-A09/12/15/17.
Operational procedure
The cause of abnormality cannot be found because the abnormality doesn't recur.
Setting up the failure mode recall function
Turn ON the power supply. <Preparation of the remote controller>
1 While pressing both OPERATION SELECT
button and TOO COOL button on the remote controller at the same time, press RESET button.
2 First, release RESET button.
And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds.
Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W1
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W1. Regardless of normal or abnormal condition, a short |
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lamp on the indoor unit blink at the interval of 0.5 |
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seconds? |
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(OFF) |
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But the outdoor unit might be abnormal because there are some |
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Blinks: Either indoor or outdoor unit is abnormal. |
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abnormalities that can't be recalled with this way. |
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Confirm if outdoor unit is abnormal according to the detailed outdoor |
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as the blinking of the left lamp of |
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unit failure mode recall function. |
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OPERATION INDICATOR lamp. W2 |
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Yes |
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Judgment of indoor/outdoor abnormality |
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Before blinking, does the left lamp of
OPERATION INDICATOR lamp stay ON for 3 Yes seconds?
Stays ON for 3 seconds (without beep): The outdoor unit is abnormal.
No
The indoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table(8-2.2.).
Make sure to check at least two consecutive blinking cycles. W2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
•Turn OFF the power supply and turn it ON again.
•Press RESET button of the remote controller.
Repair the defective parts.
Deleting the memorized abnormal condition
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to outdoor unit service manual.) Make sure to check at least two consecutive blinking cycles. W3
1After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above.
2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit.
3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
Note1.Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2.If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
W2. Blinking pattern when the indoor unit is abnormal:
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2.5-second OFF |
second interval |
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2.5-second OFF second interval |
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W3.Blinking pattern when the outdoor unit is abnormal: |
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2.5-second OFF |
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3-second ON |
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13
2. Indoor unit failure mode table
Left lamp of OPERATION |
Abnormal point |
Condition |
Correspondence |
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INDICATOR lamp |
(Failure mode) |
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Not lighted |
Normal |
– |
– |
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1-time flash |
Room temperature |
The room temperature thermistor short |
Refer to the characteristics of the room |
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or open circuit is detected every 8 |
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every 0.5-second |
thermistor |
temperature thermistor (8-7.). |
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seconds during operation. |
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2-time flash |
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The indoor coil thermistor short or open |
Refer to the characteristics of the main |
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Indoor coil thermistor |
circuit is detected every 8 seconds during |
indoor coil thermistor, the sub indoor coil |
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2.5-second OFF |
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operation. |
thermistor (8-7.). |
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3-time flash |
Serial signal |
The serial signal from outdoor unit is |
Refer to 8-6.D "How to check mis-wiring |
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2.5-second OFF |
not received for a maximum of 6 minutes. |
and serial signal error". |
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11-time flash |
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The rotational frequency feedback |
Refer to 8-6.A "Check of indoor fan |
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Indoor fan motor |
signal is not emit during the 12 seconds the |
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2.5-second OFF |
motor". |
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indoor fan operation. |
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12-time flash |
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It cannot properly read data in the |
Replace the indoor electronic control |
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Indoor control system |
nonvolatile memory of the indoor electronic |
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2.5-second OFF |
P.C. board. |
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control P.C. board. |
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NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (8-4.).
14
8-3. Instruction of troubleshooting
Start
Indoor unit operates.
Indoor unit operates.
Outdoor unit
Outdoor unit doesn't
doesn't
operate normally.
operate.
Indoor unit |
OPERATION INDICATOR |
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doesn't receive |
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lamp on the indoor unit is |
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the signal from |
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flashing on and off. |
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remote controller. |
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Outdoor unit |
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Outdoor unit |
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operates only |
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doesn't |
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in Test Run |
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operate |
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operation. |
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even in |
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Test Run |
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operation. |
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Check room |
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temperature |
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"How to check |
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thermistor. |
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inverter/ |
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Refer to 8-7. |
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compressor". |
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"Test point |
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diagram and |
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voltage". |
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Unit doesn't |
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Indoor unit |
Indoor unit |
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operates, when |
doesn't operate, |
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operate |
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EMERGENCY |
when |
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OPERATION |
EMERGENCY |
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operation in |
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OPERATION |
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COOL or |
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HEAT mode. |
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1. Check indoor / outdoor |
"Check of |
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"Check of |
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connecting wire. |
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(Check if the power |
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R.V. coil". |
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remote controller |
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is supplied to the |
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and receiver |
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indoor unit.) |
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P.C. board". |
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2. Refer to 8-6.C |
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"Check of indoor |
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electronic control |
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P.C. board and indoor |
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fan motor". |
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If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function.
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"Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed.
Refer to outdoor unit service manual.
Left lamp |
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Flash on and off |
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2-time flash |
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at 0.5-second |
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Cause: |
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intervals |
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Indoor unit |
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Cause: |
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• Trouble of |
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Indoor/ |
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room temp- |
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Outdoor unit |
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erature/ |
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• Mis-wiring |
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indoor coil |
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or trouble |
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thermistor |
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Check room |
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D "How to |
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check of |
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thermistor |
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mis-wiring |
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and indoor |
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and serial |
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coil thermis- |
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signal error". |
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tor. |
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Refer to 8-7. |
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"Test point |
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diagram and |
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voltage". |
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Left lamp |
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Left lamp |
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Left lamp |
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Left lamp |
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3-time flash |
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4-time flash |
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5-time flash |
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6-time flash |
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7-time flash |
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14-time flash |
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Cause: |
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Cause: |
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Cause: |
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Cause: |
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Cause: |
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Cause: |
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Outdoor unit |
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Outdoor unit |
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Outdoor unit |
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Outdoor unit |
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• Trouble of |
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• Trouble of |
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• Trouble of |
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• Trouble of |
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indoor fan |
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power |
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thermistor |
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outdoor |
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abnormality |
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motor |
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abnormality |
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Refer to 8-6. |
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Replace the |
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Refer to |
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Refer to |
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Replace the |
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Check |
A "Check of |
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indoor |
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"How to check |
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"Check of |
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inverter P.C. |
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"Flow chart of |
indoor fan |
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electronic |
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inverter/ |
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outdoor |
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board or |
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the detailed |
motor". |
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control |
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compressor". |
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thermistors". |
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the outdoor |
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outdoor unit |
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P.C. board. |
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electronic |
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failure mode |
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control P.C. |
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recall function." |
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board. |
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15