EcoRenovator - View Single Post - Propane (R-290) for heat pumps?

Xringer · 06-20-11, 08:48 PM

I've seen stuff like this, on the web..
"You should drain the compressor entirely, either through the suction or discharge
(Depending on your compressor, Ive had one that I had to drain through the suction)
and then fill it with the same amount of mineral oil."

I've read that R-290 is a 'drop-in' replacement for R-22, but I've also read that
systems need less R-290 to get good performance.
The amount of oil used might depend on the size of the compressor crankcase etc.

My gut feel is, you would need to use about the same amount of oil,
as was used with the R-22 refrigerant.

06-20-11, 08:48 PM	#55
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	I've seen stuff like this, on the web.. "You should drain the compressor entirely, either through the suction or discharge (Depending on your compressor, Ive had one that I had to drain through the suction) and then fill it with the same amount of mineral oil." I've read that R-290 is a 'drop-in' replacement for R-22, but I've also read that systems need less R-290 to get good performance. The amount of oil used might depend on the size of the compressor crankcase etc. My gut feel is, you would need to use about the same amount of oil, as was used with the R-22 refrigerant.