Nordyne packaged AC. Model # is P3RA-048K (as best I can read from a faded label). It's a 1999-ish, 3ton, sgl phase, with 5k and 10k add-on heat elements. Back on Jun 18, 2009 I sent an email requesting info on sequencers for my AC unit. I recieved a prompt and very helpful reply from Mark. On Jul 3...