Quote:
Originally Posted by turbo6bar
Glad to hear the contactors are indeed 120V. Makes me wonder why the old controller had the transformer and relay.
Bob, why do you need to pigtail from the power to the COM on the relay output? Won't the controller tie these together internally? Jurgen
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The xfrm was for the relay itself I think, but not sure. Small electronics aren't my specialty. I do know that to step 120v down to 24v reliably, the xfmr would be physically bigger than the one on the old controller.
The contacts are "dry contacts". Dry contacts do not provide power, they only switch power that is provided via the common. A lot of people think the common is a neutral, but not always, like on Shawn's controller. The benefit is it's versatility. You can use the same controller for many applications.