I'd like to not bore you guys with a ton of backstory so I'll try to give an abridged version of what happened to our AC unit and hope for some advice.
Its a Goodman unit, maybe a 4 ton. I thought I had the model number written down but apparently its the air handler (AR48-1, which is a 4 ton). Anyway
4 weeks ago, cap fails. Couldn't find a place to sell me one on sunday so had to call a tech. Replaces cap, starts right up. Says low side pressure is too low (can't remember pressure but according to his gauge and R22 he said the coil temp inside was 30 deg). I asked if he should fill it, and he said he couldn't because the high side pressure was 230 and climbing (it was a hot day). I asked what we should do to fix it, and his answer was "new unit".
Fast forward to a few days ago. Unit ices over in the middle of the night (85f at night). Thawed it out, changed the filter, blew out the drain line, and started it up, and it worked okay. A day later the compressor tripped the breaker. Did a bunch of tests myself, came to the conclusion that the compressor was grounding through the case (23 ohms from main line to ground).
So, I know I need a new compressor, however, a lot of what I read says that you need to find out WHY the compressor blew. On the surface it appears it was running low on charge (icing over) but I guess I'm confused on why the high side was too high to fill. Is there any test or procedure I should make sure the AC tech that replaces the compressor does to make sure that other parts in the system aren't damaged? Anything I should make sure gets replaced at the same time? Or is standard procedure to just replace the unit, clear the line, vac, and fill?
The compressor MAY be under warranty, I'm trying to find out. If not, I suppose I'll probably replace the whole condenser unit as that seems to be the common suggestion when this happens.
Anything else I can offer as information? I greatly appreciate your suggestions. Thanks.