I'm mystified. A friend of the wife's is having combo heat a/c units installed (Freidrich). The installer could not make the units work on the existing bb heat circuit. This AM I checked voltage; 120 to gnd on both bk. poles, and 240 between them. At the other end, 120 to gnd and ZERO between legs. Any one have any ideas?? . Also there IS 12-2 at the locations but the nameplate on the unit calls for 27.9 amps. Am I gonna need to pull 10-2? on a 30a bkr? More fun, it's a Zinsco.
