LP CUT OUT
Low pressure can result in a chiller refrigeration circuit due to circuit under charging, usually as a result of
loss of refrigerant due to leakage.
Low circuit pressure can result is extraordinary low refrigerant temperatures which may result in
evaporator tube failure as a result of freezing of chilled water.
CHILLED WATER FAILURE
Chillers are fitted with a number of flow switches and temperature sensors to ensure the flow of chilled
water is maintained through the evaporator.
A reduced or failed flow of chilled water through the evaporator can result in chilled water freezing. As
freezing advances evaporator tubes can be crushed resulting in splitting and loss of refrigerant into the
chilled water circuit.
Chilled water may also be carried over to the refrigerant circuit causing gross contamination and
subsequent acid corrosion in compressor components.
CONDENSER WATER FAILURE
Condenser water failure will result in high head pressure as describe in the aforementioned paragraph
“HP Cut Out”.
Condenser water failure can also result from condenser water pump failure or loss of condenser water as
a result of inadequate condenser water make up or as a result of system leakage.
Condenser water failure may also result from gross cooling tower fouling or failure of cooling tower fans.