Service manual

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4. WRONG WIRING ON SITE
4-1 Between remote controller and indoor unit
If wire is disconnected between the remote controller and the indoor unit, the POWER ON display does not appear despite
turning the power switch ON. The beep sound is not heard, either.
4-2 Phenomena due to wrong wiring between indoor and outdoor units
Wrong wiring Thermostat Phenomena
Outdoor unitIndoor unit
1
2
1
2
OFF The outdoor unit stops.
ON
Operation stops. 9 minutes later, the check code ¨P8¨ appears
on the remote controller display.
OFF Operation stops.
ON
9 minutes later, the check code ¨P8¨ appears on the remote con-
troller display.
Disconnect between 1 and 1 or 2 and
2.
Parts name Check points
Disconnect the connector then measure the resistance using a tester.
(Surrounding temperature 50°F~86°F)
Measure the resistance between the terminals using a tester.
CRANKCASE
HEATER (HC)
OUTDOOR COIL
THERMISTOR (TH3)
Normal
4.3k"~9.6k"
Abnormal
Open or short
Normal
PU12,18
PU24,30,36,42
Abnormal
1920" 1340"
Open or short
Measure the resistance between the terminals using a tester.
(Surrounding temperature 68°F)
FAN MOTOR(MF,1,2,3,4)
Normal
PU12,18 PU24,30
PU36 PU42
Motor terminal
or
Relay connector
Abnormal
77.3"
134.6"
100.2"
83.8"
73.9"
118.7"
61.5"
79.8"
Open or short
White — Blue
Blue — Red (Brown)
[PU36,42]
Protector
[PU12,18,24,30]
Red(Brown)
Blue
White
Orange(Yellow)
Red(Brown)
Blue
White
Orange(Yellow)
Protector
Protector
OPEN : 275±9˚F
CLOSE : 187±27˚F
5. HOW TO CHECK THE PARTS
PU12EK PU18EK PU24EK PU30EK PU36EK PU42EK2 PU42EK7
PU18EK
1 PU24EK1 PU30EK1 PU36EK1 PU42EK21 PU42EK71
PU24EK2 PU30EK2 PU36EK2 PU42EK72
PU24EK3 PU30EK3 PU36EK3
OC247-E--1.qxp 04.8.11 4:25 PM Page 24