Airedale DeltaChill FreeCool 110kW - 1080kW - Manual (Page 162)

DELTACHILL
™
Chillers
162
Chillers
Installation, Commissioning and Maintenance Manual : 7025232 12 / 2013
Troubleshooting
FAULT POSSIBLE CAUSE REMEDY / ACTION
Waterside
Pump not operating No power to pump Check isolator, fuses, MCBs, contactor and
control circuit wiring.
Inverter tripped and does not auto reset (the
microprocessor will try and auto reset 3 times) Reset inverter drive via microprocessor
No water flow Strainer blocked Clean strainer
Pump noisy Air in water system Purge air from water system
Pump cavitations Ensure there is 0.5m NPSH suction head to
avoid cavitations.
Unit not operating due to
water pressure sensor low
limit alarm.
Low flow alarm operating Check that the low flow pressure variable is
set correctly. If too high the unit may have
nuisance trips.
Low temp limit alarm Partial blockage in evaporator causing low
flow. The water flow is reduced however the
differential pressure switch still remains
healthy as the pressure would increase.
No heat load on system Ensure that the water strainer and
evaporator are clean.
Ensure there is design cooling load.
Water/ Glycol freezing up
(crystallizes) Insufficient glycol/water concentration for
operating temperatures. Check glycol concentration and add
accordingly.