177
TROUBLESHOOTING
2. Parts Characteristics
[Outdoor unit system]
Inspection item Measurement point Normal voltage (V) Normal resistance value (Ω)Remark
Electric leakage breaker
(ELB)
Terminal block 1 (for power
supply) (TB1)
Main PCB
DCBL PCB
Red-White-Black 1-2-3
200 V AC
NOTE) Measure the voltage at
R-S (Red-White).
Red-White-Black R-S-T
CN13[1]-[2] Red-White
CN5[1]-[2] Red-White
CN6[1] Black
Outdoor fan motors 1, 2
(FM1, 2)
DCBL PCB
[Pseudo sine wave]
Maximum output
180 V AC [effective value]
(160 V AC
[absolute average])
2 ~ 4 Ω
(Measured with connector
disconnected)
FM1;
CN7 [3]-[2] Black-White
CN7 [2]-[1] White-Red
CN7 [3]-[1] Black-Red
FM1;
4.5 ~ 5.5 V DC
CN10 [1]-[5] Gray-Pink
FM1;
2.5 VAC NOTE) Pulse signal
CN10 [1]-[2] Gray-Orange
CN10 [1]-[3] Gray-Blue
CN10 [1]-[4] Gray-Yellow
FM2;
[Pseudo sine wave]
Maximum output 180 V AC
[effective value]
(160 V AC [absolute
average]) in proportion to
engine speed
2 ~ 4 Ω
(Measured with connector
disconnected)
CN8 [4]-[2] Black-White
CN8 [2]-[1] White-Red
CN8 [4]-[1] Black-Red
FM2;
4.5 ~ 5.5 V DC
CN12 [1]-[5] Gray-Red
FM2;
2.5 V AC NOTE) Pulse signal
CN12 [1]-[2] Gray-Orange
CN12 [1]-[3] Gray-Blue
CN12 [1]-[4] Gray-Yellow
Outside air temperature
sensor (THO)
CN6 [9]-[10] Red-Red Temperature
( ℉ ( ℃ ))
Resistance
(Ω)
• Disconnection temperature is
detected (lower than -38 ℉
(-39 ℃ )).
Disconnection is detected for
1 minute (outside air tempera-
ture sensor disconnection→
61-0) (engine compartment
temperature sensor discon-
nectiont→72-0)
• Short circuit temperature is
detected (194 ℉ (90 ℃ ) or
higher).
Shot circuit is detected for
1 minute (outside air tempera-
ture sensor short circuit→
61-1)
(engine compartment temper-
ature sensor short circuit→
72-1)
14 (-10) 23.7 k
32 (0) 15.0 k
50 (10) 9.8 k
68 (20) 6.5 k
Engine compartment tem-
perature sensor (E/G R)
CN6[13]-[14] White-White 86 (30) 4.4 k
104 (40) 3.1 k
122 (50) 2.2 k
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