Samsung AVXCSH023/032/040CE Service Manual page 121

Reverse phase, phase fail detection (Outdoor unit using 3-phase power) –
any problems
1. When power is on, it checks the power status used for 3-phase power compressor.
When the order of 3-phase L1(R) – L2(S) – L3(T) is changed (reversed) or there is a phase that does not receive power (phase
fail), it will display E425 and the air conditioner will stop operating.
TRANS-OUT
250V/T1A
5
BD902
CN901
RED
C905
BD901
IC901
250V/T2A
C906
R370
R371
R372
C524
C907
7812
C910
CN62
BLU
6
7805 MAIN-EEV1
CN64 BLU CN63 YEL CN65 BLK
5 6 5
EVI-EEV MAIN-EEV2 HR-EEV
A B C
CN44 CN47
WHT WHT
8 6 4
SUCTION DISCH3 DISCH2 DISCH1 OIL-BAL TUBE COND/O EVI-O
4 4
4
CN49 WHT CN42 RED CN41
SUMP AIR H-SENSOR L-SENSOR
1) Check if the power is L1(R) – L2(S) phase/ L1(R) – L3(T) phase/ L2(S)
– L3(T) phase.
2) When there is any terminal that does not have normal voltage,
check the external power of the air conditioner and take appropri-
ate measures.
3) If 3-phase power is normal check the phase of the power line using
3-phase tester.
If it shows reverse phase, please change the current power line
connection.
4) After completing above, press reset key (K3) then check the power again.
5) If the same problem occurs during the second check-up, check the color of the 3-phase power check lines. If there is no prob-
lem, please replace PCB.
When there is a wrong line connection on N phase (when one of R, S and T is changed with N phase), DVM PLUS3
carries out power protection to display E425 and cut off the power within 1 minute.
If that happens, it is not a PCB power defect and check the phase of power lines before replacing PCB.
Samsung Electronics
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COMM.5V IN-COMM OUT-COMM 12V
CN92_SUB BLK CN91
CN31 RED CN32 CN32 YEL CN12 BLU
CN13 BLK 2
10
D R22 R20 D
C349
F901
80 65 C350
C418
C924 C353
C54
64
R335 R336
C55
CD32 CD33
C409
C352 C56
C411
C412
C323 C322
C413
C923 C303 C302 C321
R337
C301
IC20
R355
LED07 GRN
C221
IC23 R356
13 C222
LED08 RED
R221
C351
24 41
25 40
IC14
PC02 PC03 PC04
IC10 IC08 IC02
DB41-00613A
OUTDOOR
LED101 LED102 LED103 LED104 LED113 SS71
GRN R101 R102 GRN R103 GRN R104 GRN R113
A
B
VA74
C
CN48
RED
EVI-I RY86 RY79 RY85 RY84 RY74
2
3 3 3 3 3
BLU CN86 BLU CN75 WHT CN85 YEL CN84 BLU CN73 YEL CN71 WHT
LIQUID EVI OD EEV COOLING 4-WAY PWM
Display Part
Reset Key
DOWNLOAD
BLK CN10 WHT CN100 WHT
DIS1
K1
10 7 4
IC701
C701 K2
26
C506
51
K3
C817 Q601 Q602 Q604 Q603
C344
C345
C813 C816
C354
K4
R373 76 100
C814 IC06
IC04 C812
X501
0 0
ON ON ON ON
K13 K14 K15 K16 K17 K18 K19 K20
TEN ONE K5 K6 K7 K8 K9 K10 K11 K12
SW01 SW02 SW03 SW04 SW05
INDOOR
IC07 IC09
LED112 LED114 LED115 LED116 LED107 LED105 LED108
GRN R112 GRN R114 GRN R115 GRN R116 GRN R107 GRN R105 LED106 R106 GRN
GRN
RY75 RY73 RY72 RY71 RY81 RY83 RY82 RY80
2 2 2
3 7 7
CN74 RED CN72 BLU CN80 RED CN82 YEL CN81 BLK
HOTGAS N C-3 C-2 C-1 OIL3 OIL2 OIL1 A-CCH
Troubleshooting
display with
DIS2
R501
R502
PC501
R503
R504
PC502
5
R505
3PHASE
380V~415V
Setup switch
PC503
R506
IC05
070512-00416-04
for the number
08.01.04
of Indoor units
D939
D940
3
0 D52
MCU setup
D51
D54
switch
D53
ONE SW09
K21 K22 K23 K24 K25 K26 K27 K28 K29 K30
D56
MCU
D55
LED109 LED110 LED111 Q501
R108 GRN R109 GRN R110 GRN R111
814
C504
RY78 RY77 RY76
7 3
CN77 WHT CN76 YEL CN70 BLK
CCH-3 CCH-2 CCH-1 POWER
3-phase tester
4-37