Recent content by ptwohey

I'm back and replying to my own thread. I studied the wire diagrams for both the aquastat and zone controler. They are contradicing when it comes to the line voltage source. The aquastat shows that ZR and ZC are the hot and neutral 120V controled by the temperature relay that could...

I see everyone's response and you have a few choices to consider, but, what I do is to loosen the nut and open the union, clean any sediment and crud that has grown on them, then wrap teflon tape around the plastic washer, insert it, and tighten it down. It has worked so far, about 5 years now.

I am upgrading my old heating system with a larger WM with a tankless that comes prewired with an aquastat with one zone and the ZC and ZR terminals for additional zones. My question concerns the ZC and ZR terminals. What do they do? With the old system that had similar wiring, I...