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jwasir
14-06-2010, 09:59 PM
Does the foam in oil SG means liquid coming back to comp??

I've seen a system where Super heat was 25 deg and still glass was foaming badly.

Any Suggestions??

gregd1401
15-06-2010, 08:28 AM
May be caused by low suction pressure due to insufficient refrigerant.

sedgy
15-06-2010, 03:38 PM
jwasir, have you got a cch, < crank case heater < on the compressor?

chemi-cool
15-06-2010, 04:20 PM
The foam is boiling refrigerant.
Check that the oil level sight glass is over 38°C and it should be OK, a little bit of refrigerant in the oil never killed any compressor.

Tesla
16-06-2010, 01:06 AM
Some systems like Carrier Recip chillers keep the liquid solenoid closed for 30 seconds at start up to boil off any refrigerant in crank case. There could also be a partially blocked suction service valve strainer causing the same.

SkyWalker
07-07-2010, 09:31 PM
Check that the oil level sight glass is over 38°C and it should be OK,


hi chemi-cool, is this a good rule of thumb for all refrigerant oils?

if so, what is key about 38C and over?