Appendix B: Alarm Table
Alarm
Description
High Pressure Alarm
The pressure of the discharge gas is higher than the set value
High Pressure Lock
The High Pressure Alarm is generated three times in an hour or the High Pressure Alarm is active for ten
minutes. In this case, the compressor stops working
Low Pressure Alarm
The pressure of the suction gas is lower than the set value
Low Pressure Lock
The Low Pressure Alarm is generated three times in an hour or the Low Pressure Alarm is active for ten
minutes. In this case, the compressor stops working
High Discharge Temp
The temperature of the discharge gas is higher than the set value
High Discharge Temp Lock
The High Discharge Temp alarm is generated three times in 24 hours. In this case, the compressor stops
working
Low Discharge Superheat
The superheat of the discharge gas is lower than the set value
Low Discharge Superheat Lock
The Low Discharge Superheat alarm is generated for three times in an hour
High Supply Temp
The temperature of the supply air is higher than the set value
Low Supply Temp
The temperature of the supply air is lower than the set value
High Return Temp
The temperature of the return air is higher than the set value
Low Return Temp
The temperature of the return air is lower than the set value
High Return Humidity
The humidity of the return air is higher than the set value
Low Return Humidity
The humidity of the return air is lower than the set value
Power Loss
Power supply is off and is then restored
Power Overvoltage
The voltage of the power is higher than the set value
Power Undervoltage
The voltage of the power is lower than the set value
Power Frequency Offset
The offset of power frequency exceeds the set range
Heater Failure
The heater cannot work normally
Condensate Water High
The condensate water in the drain pan reaches the highest level
Water Underfloor
The condensate water is leaking from the drain pan onto the room floor
Filter Clogged
The filter is clogged
Filter Maintenance
The filter has not been maintained in the specified time period
Airflow Loss
All fans cannot work normally
Remote Shutdown
The unit has been shut down remotely
Master Unit Loss
The master unit cannot communicate with subordinate units
Subordinate Unit Loss
The subordinate unit cannot communicate with the master unit
Unit Address Duplicated
The address of one unit is the same with the address of another unit
EEV Driver Communication Failure
The EEV driver cannot communicate with the iCOM Edge board
10DI Communication Failure
The 10DI board cannot communicate with the iCOM Edge board
Compressor Driver Communication
Failure
The compressor driver cannot communicate with the iCOM Edge board
11 Appendices
78
Vertiv™ Liebert® CRV CRD25 and CRD35 Row-Based Cooling System User Manual
