181
TROUBLESHOOTING
Refrigerant high pressure
switches 1, 2 (HLSW1, 2)
(HLSW2 is 15 TON only)
CN30[1]-[2] Red-Red
OFF: 11 ~ 13 V DC
ON : 1 V DC or less
1 MΩ or more (OFF)
1 Ω or less (ON)
An error is detected when the
sensor detects 551 psi. (3.8
MPa) (OFF). Normal state is
resumed at the detection of 421
psi (2.9 MPa) (ON).
Disconnection is detected when
transformer power supply is ON
and refrigerant high pressure
switch OFF is detected for
3 minutes. (refrigerant high
pressure switch disconnection
→76-0)
Refrigerant high pressure
sensor 1 (PSH1)
CN4[33]-[31]-[32]
Red-White-Black
Power supply voltage
4.75 ~ 5.25 V DC
CN4[33]-[32]
Output voltage
0.5 ~ 3.753 V DC
CN4[31]-[32]
Refrigerant low pressure
sensor (PSL)
CN4[34]-[11]-[12]
Red-White-Black
Power supply voltage
4.75 ~ 5.25 V DC
CN4[34]-[12]
Output voltage
0.5 ~ 3.853 V DC
CN4[11]-[12]
Outdoor heat exchanger
liquid flow control valve
(OEV)
CN5[20] Red
CN5[18] Brown
CN5[25] Blue
CN5[27] Orange
CN5[21] Yellow
CN5[23] White
11 ~ 13 V DC
Red-White (8 TON)
NOTE) When the elecrtonic
expansion valve is 5 cores
(without brown), substitute
red core for brown core.
Red-Orange 46 ± 4 Ω
Brown-Yellow (15 TON)
Brown-Blue 34.3 ± 4.3 Ω
White-Orange
(8 TON)
92 ± 8 Ω
Yellow-Blue (15 TON)
68.6 ± 8.6 Ω
Sub heat exchanger liquid
flow control valve (SEV)
CN5[16] Red
CN5[14] Brown
CN5[17] Blue
CN5[19] Orange
CN5[13] Yellow
CN5[15] White
11 ~ 13 V DC
Red-White (8 TON)
Red-Orange 46 ± 4 Ω
Brown-Yellow (15 TON)
Brown-Blue 34.3 ± 4.3 Ω
White-Orange
(8 TON)
92 ± 8 Ω
Yellow-Blue (15 TON)
68.6 ± 8.6 Ω
Subcooling valve (SCEV) CN5[12] Red
CN5[10] Brown
CN5[9] Blue
CN5[11] Orange
CN5[5] Yellow
CN5[7] White
11 ~ 13 V DC
Red-White
46 ± 4
Ω
Red-Orange
Brown-Yellow
Brown-Blue
White-Orange
92 ± 8 Ω
Yellow-Blue
Inspection item Measurement point Normal voltage (V) Normal resistance value (Ω) Remark
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