Tripp Lite AG-0548 Series User Manual page 14

2. Operation and Maintenance
Alarm/Fault
High Discharge Pressure / HP/
HD Switch Alarm
Low Suction Pressure
In-Row Cooler Maintenance
Time
Indoor Fan Maintenance Time
Compressor Maintenance
Time
Outdoor Fan Maintenance
Time
Filter Maintenance Needed
Reason
Dirty condenser coil
Condenser fan malfunction
Refrigerant overcharged
Expansion valve is set too
"loose"
Expansion valve failure
Contaminated refrigerant
Not enough airflow
Condenser signal wiring
disconnected
Low heat load (minimum
cooling capacity exceeds the
heat load in the room)
Dirty filter
Refrigerant undercharged
Expansion valve excess
superheat
Expansion valve malfunction,
replace
Kinked liquid line
Low airflow across evaporator
Condenser signal wiring
disconnected
In-Row Cooler service interval
has expired
Action(s)
Clean coil with water
Check fan coil and replace if necessary
Ensure fan spins freely
Measure motor amperage and ensure it is not higher than
nameplate
Remove excess refrigerant; the high pressure in the
control should be between 2.3 to 2.8 MPa
Appropriately adjust the opening degree of the expansion
valve
Replace expansion valve
Check the sight glass for refrigerant quality and level
Replace refrigerant if necessary
Ensure proper airflow clearances
Ensure condenser signal wiring is still intact
If multiple cooling In-Row Coolers are on, turn off
additional cooling In-Row Coolers by either ensuring group
control is configured properly or manually putting In-Row
Cooler(s) into standby
Replace filter
Add charge; shall be 9-10 bar, depending on room
temperature
Recalibrate expansion valve
Filter drier plugged
Ensure temp drop across is less than 2°F
Replace if necessary
Identify and repair
Replace filter
Check for obstructions
Ensure condenser signal wiring is still intact
Perform preventative maintenance, then reset timer
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