LG RCAW Operation & Maintenance Manual page 73

Displayed Alarm
Message
• Trip of compressor
internal protector
(switch off) by high
compressor winding
temperature
Comp overload
Alarm
• Trip of compressor
internal protector
(switch off) by high
discharge temperature
• Trip of anti-freezing
switch (switch off)
Low temp
(Default: chiller CHW
temp out ≤ 35.6°F(2°C)
Recognition
• Voltage error
• Controller DI or DO point error
• Comp error
• Internal protective switch error
• Condenser fan motor error
• Contamination of condenser fin.
• Refrigerant flow rate insufficient
• Controller AI point error
• Comp error
• Internal protective switch error
• Too high ambient temperature.
• CHW flow insufficient
• Too low set value of chilled CHW
temp out
• Too high anti-freezing set value
• Anti-freezing switch error
• Too low ambient temperature
• Controller DI error
• Refrigerant insufficient
• Contamination of cooler
• Malfunction of M1 or M2
Possible Cause
Operation & Maintenance Manual 73
Trouble Shooting
Possible Remedy
• Review voltage
• Repair or replace controller
• Test or replace comp
• Test or replace internal protective
switch
• Check condenser fan motor
• Clean condenser fin
• Charge additional refrigerant or
review valve condition
• Repair or replace controller
• Repair comp
• Test or replace internal protec-
tive switch
• Check ambient temperature
• Increase CHW flow or replace
pump
• Increase set value of chilled
CHW temp out
• Lower anti-freezing set value
• Replace anti-freezing switch
• Check ambient temperature
• Repair or replace controller
• Supplement refrigerant
• Clean cooler
• Replace M1 or M2