User manual

HVAC Maintenance Checklist
Liebert
®
DS
™
154
Controls
___ 1. Check/Verify Control Operation (Sequence)
___ 2. Check humidifier high water alarm operation
___ 3. Check operation of the air safety switch
___ 4. Check setting/operation of the filter clog switch
___ 5. Check/test changeover device(s)
___ 6. Check/test water detection device(s)
Air-Cooled Condenser / Drycooler
___ 1. Coil surfaces and fans free of debris (clean, wash and straighten fins as needed)
___ 2. Fan motors securely mounted
___ 3. Motor bearings in good condition
___ 4. Check all piping and capillaries for vibration isolation; support and secure as necessary
___ 5. Check fuses
___ 6. Check contactors for pitting
___ 7. Check wire connections
___ 8. Fan speed control operation
___ 9. Check operational sequence/thermostat setpoints
___ 10. Check refrigerant/glycol lines for signs of leaks/repair leaks as found
___ 11. Check refrigerant level in each Liebert Lee-Temp receiver
___ 12. Glycol level
___ 13. Glycol solution___________________________ %
___ 14. Motor amp draw
Glycol Pump
___ 1. Check pump rotation
___ 2. Check for glycol leaks
___ 3. Pump pressures
___ 4. Amp Draw
___ 5. Pump changeover (if multiple pumps)
#1 L1 L2 L3
(L1 and L2 on Fan Speed Control Motor)
#2 L1 L2 L3
#3 L1 L2 L3
#4 L1 L2 L3
#5 L1 L2 L3
#6 L1 L2 L3
#7 L1 L2 L3
#8 L1 L2 L3
#1 Suction Discharge
#2 Suction Discharge
#1 L1 L2 L3
#2 L1 L2 L3