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Isobutane is a great refrigerant for small charge systems.
The permissible charge is being increased for many flammable refrigerants.
R-290 (Propane) is another that is being utilized as an R-22 replacement. Very similar operating characteristics and pressure to R-22 and small A/C systems have been utilizing this for a while overseas.
My basement fridge (LG) is charged with Isobutane and I think the chest freezer is too.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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