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Faunsdale, AL | I haven’t tried the R290 ………yet! Have used some propane blend years ago that was supposed to be a R12 drop in replacement.
I expect your expansion valve or orifice tube tends to result in the evaporator too cold and or it may be partially plugged with dust and debris. Anytime it frosts the coil, it soon stops air flow completely.
I always heard the most appropriate fuel gas to use was high altitude stove fuel which was isopropane. I actually bought a can that I saw on a clearance rack a while back but haven’t tried it in anything yet. I expect you’re undercharged and by the time you get enough in it, the head pressure will be very high. But I have no experience, so that’s a guess. Try more or less charge and report back your results.
Maybe you need to raise the temp setting so the compressor cuts out when the evaporator gets too cold and starts frosting. Have had that when the evaporator was partially plugged with dust. Better to have some cooling long term than lots and then none!
Edited by ccjersey 8/2/2024 06:27
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Charging AC system with R290
