b420
Stop - do not go further . . ..
Get your father involved in this project. It will require brazing which is not the kind of "soldering" you do with electronic circuits. Brazing is with very high temp gas and brazing rods, not a low temperature soldering "gun" and lead/tin solder.
Go back and read what people have done. Randen, Jeff May and AC have all done a lot with small compressors that use R-22.
Forget the three phase systems - just get too complicated. Keep it simple stupid is an English expression called KISS, that is very important.
The electronics behind a simple gt heat pump are simple. Basically off and on switch and a fan relay.
Start by brazing copper tubing and if you are good at it I apologize. But it is a skill that is very different from low temperature soldering. And brazing is something that MUST be done with heat pump systems.
R-22 is a very easy gas to work with and to get. It is basically propane.
To repeat KISS . . . . .
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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