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2. Operation and Maintenance
2.6 Regular User Maintenance
• Ensure In-Row Cooler is meeting the setpoint.
• Clean/replace filters every 6 months or when needed.
• Check the alarm log.
• Check for water leaks in or around the In-Row Cooler.
• Ensure working rotation schedule by observing which In-Row Cooler(s) are in standby each week.
2.7 Alarms and FAQ
Alarm/Fault
Compressor Fault
EEV Fault
Inverter Fault
Unstable Cooling Operation
High Supply Air Temperature
(continued on following page)
Reason
Excessive refrigerant in system
Refrigerant backflow/migration
Inverter fault
Seized due to oil loss
Thermal overload
Supply voltage value
High liquid head pressure
Loss of sub-cooling
Excessive refrigerant in system
Power boot sequence fault
Unstable power
Refrigerant contamination/
overcharge/undercharge
Environmental factors
Invalid upper temperature
threshold
Outdoor temperature too hot (if
outdoor ambient temperature is
too hot, the condenser cannot
effectively reject enough heat
and therefore derates the total
system capacity)
Action(s)
Remove excess refrigerant
Check that ambient temperature is above rated condition
(install low ambient kit if necessary)
Ensure necessary piping valves and bends
Ensure condenser height is not above the maximum limit
Refer to inverter fault section
Ensure proper trapping and pitching of refrigerant lines
Ensure condenser height is not above the maximum limit
Replace compressor
Check integrity of overall system to ensure compressor is
not generating excessive heat
Check for voltage instability
Ensure condenser vertical height is not higher than
maximum limit
Ensure sufficient insulation
Ensure condenser elevation is not too low
Remove excess charge so as to remove liquid refrigerant
from compressor
Reboot system
Check for voltage instability
Check sight glass to determine quality of refrigerant
Ensure system is installed and configured within
specification
Adjust cooling setpoint and thresholds appropriately
When and where possible, turn on additional cooling In-
Row Coolers
Attempt to set the supply air temp and high temp
threshold settings higher (temporarily) to allow the system
to run a bit warmer while allowing the alarm to clear
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