Go Back   EcoRenovator > Improvements > Geothermal & Heat Pumps
Advanced Search

Blog 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read

Thread Tools Display Modes
Old 03-24-18, 12:46 AM   #1
Apprentice EcoRenovator
Join Date: Apr 2011
Location: PNW
Posts: 197
Thanks: 0
Thanked 47 Times in 31 Posts
Default top off R22

Stash of R22 about gone.

Figure to top off from now on when needed with R290 (or BBQ)

Will just fill for 10 deg superheat, do not forsee any problems or other complexity.

Overlooking anything? (BBQ would be run thru filter dryer first)

Note: already figured that air fuel mix would remain below ignition even with 100% leak.

mejunkhound is offline   Reply With Quote
Old 03-26-18, 12:27 AM   #2
Supreme EcoRenovator
Join Date: Jan 2010
Location: elizabethtown, ky, USA
Posts: 2,427
Thanks: 430
Thanked 618 Times in 516 Posts
Send a message via Yahoo to jeff5may

No need to give you a disclaimer here: I already know that you are seasoned and safe. This will work great for most residential systems that have a critical (small) charge. The PT chart will shift slightly, but the main thing to consider is oil control. R22 and oil are not highly miscible, but oil and R290 dissolve in each other well. So with any storage vessels (receivers, accumulators, etc.) the oil and propane mixture will float atop the R22.

Another recommendation by the experts is that since R290 has higher heat capacity, a few extra degrees of super heat is a good way to protect against oil foaming and liquid slugging. A lot of the refrigeration equipment being produced abroad runs off R290 now, and these units all seem to be undercharged.
jeff5may is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 03:40 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design