refrigerant dryer trips on oil pressure

[josephmuriyad]

Dear Sir ,

Our refrigerant dryer trips on low oil pressure after one hour from starting the system. After tripping oil level shows very low and then after some times level comes up. Pls.suggest resolve this problem.

[sneep]

Oil pump, traps, refrigerant charge are good starting points.

[powell]

Here's a link to a previous post that should help you out.

http://www.refrigeration-engineer.com/forums/showthread.php?t=23829

[lana]

Hi,

One of the problems could be liquid flood back to the compressor even small amount.
When liquid refrigerant is present in the crankcase, it evaporates and creates a lot of vapour. This vapour blocks the oil pump inlet and oil is not circulated. When oil pressure switch delay is passed then it trips the compressor.
Check the superheat and see if you have liquid flood back.
Cheers