Oil Temperature

[PLEH2EREH]

I understand the reason behind crankcase heaters for when a system is idle (not-running). Is there a "standard" temperature (degrees f. above) that the oil should be, other than above the refrigerant saturation temperature? I know it should not be too high cause the oil will break down. Thanks ahead for the responses.

[narkom]

It should be of 5-8K above the ambient temperature.

[RANGER1]

To add, above but maximum ambient temperature 40-45 deg C would cover it.

[PLEH2EREH]

I never considered the ambient temperature part. Please do explain.

[narkom]

The refrigerant saturation temperature depends on the ambient temperature when the system is not running.
The compressor sump should not be the coldest part of the refrigeration circuit to avoid refrigerant migration and prevent refrigerant from being absorbed in the oil.
http://www.bristolcompressors.com/files/7014/5530/8861/135_-_Crankcase_Heaters.pdf

[PLEH2EREH]

Guess I didn't make that clear in my original question. What you just said is was what I meant by "idle" not running and above the refrigerant sat. temp.. Anyway, as always, I appreciate the responses/help from you both..