Question on AC condenser unit
My home has three phase wiring, and last year, when I had to replace a five ton AC condenser, the AC company told me I either had to use a three phase unit (commercial, and more expensive), or they would have to redo the wiring. I told them I would prefer not to jury rig the wiring, and wound up spending almost five thousand dollars for the unit. I had a smaller unit replaced this year, by another company, which turned out to be single phase. When I mentioned my relief, and told the guy the story about the larger unit, he looked at it, and said it was single phase. I went back to my contract, and checked out what was written, and it definitely said three phase, thirteen seer. I checked the model number online, and found it to be a single phase, eleven seer unit. Obviously the installer took me for a ride, but my main question is - what did they have to do to the wiring to use a single phase unit, and should I be concerned about the wiring, as wlel as about the fraud involved?