Lennox CLIMATIC series User Manual page 58

COMMUNICATION
ALARM 123, 223, 323:
CONDENSER, TEMPERATURE SUBCOOLING TOO LOW
ALARM 124, 224, 323:
CONDENSER, TEMPERATURE SUBCOOLING TOO HIGH
Description
The CLIMATIC indicates an over-temperature:
• Alarm n23: air / water evaporator subcooling too low on circuit n,
• Alarm n24: air / water evaporator subcooling too high on circuit n,
Action
These alarms are only reported: it had no effect on compressors.
Reset
The alarm is automatically deleted if the temperature is correct. This trip is saved in the alarm history only if the DS is connected or if
999 faults were activated during one day.
The daily counter is automatically reset every day at 11 am. The 999th trip is locked and must be manually reset.
Possible cause(s)
• Problem of refrigerant capacity
• Problem with the expansion valve.
Remedies
• Check the frigorifi c system operation,
• Replace the expansion valve.
ALARM 127, 227, 327:
MAXIMUM OPERATING PRESSURE (MOP), FAULTY
ALARM 128, 228, 328:
LOW OPERATING PRESSURE (LOP), FAULTY
Description
The suction pressure measured by the CLIMATIC is outside a permitted range.
• Alarm n27: Max operating pressure on circuit n,
• Alarm n28: Low operating pressure on circuit n,
Action
These alarms are only reported: it had no effect on compressors.
Reset
The alarm is automatically deleted if the pressure is correct. This trip is saved in the alarm history only if the DS is connected or if 999
faults were activated during one day.
The daily counter is automatically reset every day at 11 am. The 999th trip is locked and must be manually reset.
Possible cause(s)
• Problem of refrigerant capacity
Remedies
• Check the frigorifi c system operation
• 56 • CLIMATIC RT_UNITARY-IOM-1508-E