Steve
I have two different units, one with A/C Off switch and one with a snow flake button. both hook up the same on the rear and appaer to have the same PCB board, did not compare P/N's. They both work as specified. sadly in my case both units have bad relays, i verified this by taking my dremel tool and cutting the top off the relays. they were not making contact, the only time i could get them to contact was with a screw driver, pushing them together didnt do anything unless i pushed really hard. Worn contact's, they are not really serviceable due to the lack of room within the relay.
Ive ordered the relays from digikey ( as specified in the FAQ ) and once i install them i will search out this thread and update it.