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The contractor is installing a new central a/c unit in place of an enclosed unit on the roof. My question is how much if any refrig. oil needs to be added to the system on top of the compressor oil supply. I have worked auto a/c for a long time and know if the system is new or purged it will need oil replaced. The condensor will be ground mounted and the evap will be 6 feet higher in the house. The line run is about 25 feet compressor to evap. The compressor is a Copeland Scroll. It is serviced with 37 oz. of oil as shipped. The system will be using a TXV expansion valve with R-22 freon. All components are new. The contractor says no more oil needs to be added. I just want to make sure before he fires it up.

The compressor does not have a sight glass on this unit.

Thanks
 

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GC/Master Plumber/Mech
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Contractor is right it needs no more oil.

Automotive and residential a/c is not the same.

Also, if this is a new install then why are you wasting your money on a R-22 system that is going to be phased out in 2010. Heck I'd be more worried about this than oil. If the install is complete, well then you are going to have to live with it. If not UPGRADE to R-410a
 
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