LG RCWFH Series Instruction Manual page 35

Category Description
High motor winding tem-
perature contact opens
Low evaporator refrigerant
temperature contact
closes
Oil pump overcurrent con-
tact closes
High bearing temperature
contact closes
High condenser pressure
contact closes
Switch
contact
Failure to operate
Delta contactor opens
when operating
Starter abnormality con-
tact closes
Compressor motor power
contact opens
Low oil pump pressure
Cause
Coil temperature input contact opens
Low evaporator refrigerant temperature
contact closes
Thermal type overcurrent relay contact
attached on the oil pump power line
closes
High bearing temperature contact
closes
High condenser pressure contact closes The Chiller stops
No input signal for compressor opera-
tion complete
Starter contactor opens when operating The Chiller stops
Starter abnormality input contact closes The Chiller stops
Compressor power contact opens
when operating
Low oil pump pressure contact closes
Table 6. Protection Logic
Action
The Chiller stops Abnormal
The Chiller stops Abnormal
The Chiller stops Abnormal
The Chiller stops Abnormal
Abnormal
The Chiller stops Abnormal
Abnormal
Abnormal
The Chiller stops Abnormal
The Chiller stops Abnormal
35
Status