I hope this is the right place to post one of my first questions...gotta built the 15 posts.
Anyway, I bought a 4 ton 18 seer Hp for a client (Airease/FrasureJohnson group of products, York stuff I believe). I didn't buy an indoor coil and instead sized up a brazed plate condenser so i can heat water for floor heating. This is all working well except that it won't trigger a defrost.
I had a Ranco15 defrost control from an old HP and installed it but the original defrost board doesn't like the open contact where the Rv was connected. I was thinking of putting a resister across the RV pins to fool the control but I'm not sure this will work.
Has anyone had to make some adaptation to a board like this or know if the johnson board can be fooled by the resister?