Lennox CLIMATIC series User Manual page 57

COMMUNICATION
ALARM 118, 218:
WATER EVAPORATOR, RISK OF FROSTING
Description
The evaporating pressure measured by the LP sensor is too low and may pose a risk for the water evaporator. These alarms are
disabled if the glycol rate is greater than 45%. The LP pressure has reached the limit of 0°C for 2 minutes while a compressor was
running for at least 2 minutes. This alarm is disabled during 1 minute when a compressor start or stop or during the defrost procédure.
• Alarm 118: risk of frosting the water evaporator by circuit 1,
• Alarm 218: risk of frosting the water evaporator by circuit 2.
Action
Immediate shut down of the complete circuit. The alarm is signalling.
Reset
Once the suction pressure is higher than 0°C for 2 minutes, the alarm is automatically deleted. Up to 3 trips can occur during a day
and are saved in the alarm history. The two fi rst trips don't give the alarm alert except if a trip is still present for 1 hour, and the alarm
counter is reset every day at 6 am. The third trip activates the fault report 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 121, 221, 321:
EVAPORATOR, TEMPERATURE SUPERHEAT TOO HIGH
ALARM 122, 222, 322:
EVAPORATOR, TEMPERATURE SUPERHEAT TOO LOW
Description
The CLIMATIC indicates an over-temperature:
• Alarm n21: superheat temperature too low on circuit n,
• Alarm n22: superheat temperature 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.
CLIMATIC RT_UNITARY-IOM-1508-E • 55 •