Common Faults And Solutions Of Centrifugal Chillers

Oil pressure difference is too low:
reason:
(1) The oil filter is clogged.
(2) The opening of the oil pressure regulating valve (drain valve) is too large.
(3) The oil output of the oil pump decreases.
(4) Bearing wear.
(5) The oil pressure gauge (or sensor) fails.
(6) Too much refrigerant is mixed into the lubricating oil (the oil pressure is too low due to oil foaming during startup).
Approach:
(1) Replace the oil filter element.
(2) Close the oil pressure regulating valve to increase the oil pressure to the rated oil pressure.
(3) Disassembly inspection.
(4) Replace the bearing after disassembly.
(5) Check the oil pressure gauge, recalibrate the pressure sensor, and replace it if necessary.
(6) After the refrigeration machine is stopped, the oil heater must be put in to maintain the given oil temperature (confirm whether the oil heater is disconnected and whether the setting value of the oil heater temperature control is correct).
4. Oil temperature is too high:
reason:
(1) The cooling capacity of the oil cooler is reduced.
(2) The supply of refrigerant for cooling the oil cooler is insufficient due to clogging of the refrigerant filter screen.
(3) Bearing wear.
Approach:
(1) Adjust the oil temperature regulating valve.
(2) Clean the refrigerant filter screen.
(3) Repair or replace the bearing after disassembly.
5. Cut off water:
reason:
The amount of cold water is insufficient.
Approach:
Check the cold water pump and cold water circuit and adjust to normal flow.
6. Main motor overload:
reason:
(1) The power phase voltage is unbalanced.
(2) The voltage drop of the power line is large.
(3) The amount of refrigerant supplied to the main motor for cooling is insufficient.
Approach:
(1) Take measures to balance the power phase voltage.
(2) Take measures to reduce the voltage drop of the power supply line.
(3) Check the refrigerant filter screen and clean the screen; open the refrigerant liquid inlet valve.