hello to everyone! I have a Trane chiller model cgacc70 that I have low oil pressure. Compressor was replaced two years ago. this past summer expansion valve was stuck and solenoid valve was sticking. I installed these items and still having a low oil pressure issue. Read the Trane manual says chiller should have 20 to 30 psi pressure above suction. Do these particular chillers have an oil screen inside the compressor? My oil pressure when the temp is warm outside is only 12 split between the suction and oil pressure. oil in sight glass is half way up fully loaded but has foam. I know foam is not good on any compressor. any ideas? oh yes at start up when I am running unloaded suction pressure is anywhere from 90 - 100 and stays then gradually starts to come down but compressor trips before it will fully load. seems like I do not have this issue in the mornings when it is cool and I do not have all 3 fans staged in.