Originally Posted by Reelale
Resurrecting this thread. Passedpawn, do you still use the analog with the circuit in your link? I'm not quite understanding how it works without switching the jumpers in the controller itself.
Yes, I still use it, although it doesn't often get cold enough in florida to put a heater in the chest freezer (although it's all outside).
Inside the ranco is a relay. The relay has a common, to which you connect power. Then, it's arm switches between two contacts. It doesn't just "open-circuit".
So, you want to wire each of those 2 contacts to separate outlets. You only want to plug in one device (either the freezer power OR a heater) and it will just work. If you think about it you will probably figure it out.
It would work if you pluged in both devices, but there needs to be a gap in temperature where nothing happens (hysteresis) so you don't get short-cycling of the compressor and heater. It might work, but I'm not sure; I think the johnson had 3 or 5 degrees hysteresis, but maybe that's not correct.