1500 ton centrifugal chiller, 123...running in low load
1500 ton centrifugal chiller, 123...running in low load
(OP)
Can this chiller be run with low condenser water temps?...say around 65 deg? or will the oil "migrate"
Thanks for any insights.
Thanks for any insights.





RE: 1500 ton centrifugal chiller, 123...running in low load
RE: 1500 ton centrifugal chiller, 123...running in low load
RE: 1500 ton centrifugal chiller, 123...running in low load
At first, some operators were thinking we had oil migration and the sump was too low.
To remedy the oil foaming problem, we programed it to startup @ 45% FLA and remain there for 30 minutes, then allow it to increase load in 10% increments as required to satisfy LCW setpoint. Running the chiller for long below 45% will tend to overheat the compressor....Allowing it to assume the load too fast will cause the oil to foam instantly when the EQ/vent valve opens.
If you ask the question because chiller is shutting down after start up due to low oil pressure, then do a cold start in service mode and limit FLA to 45%......Once you hear the EQ/vent valve open(3-5 minutes after startup), observe sump sightglass and oil pressure....You may see some foaming and hear the pump chatter and pressure may drop...After a 10-15 minutes if pump has stopped chattering, pressure increased to normal and oil stopped foaming, then bump it up 10% at a time until you can release it in automatic.