Posted by Dennis Minn on November 11, 2019 at 13:43:19 from (67.4.25.11):
In Reply to: Boiler control problem posted by showcrop on November 11, 2019 at 13:07:57:
showcrop,
If I read this right, you have a large hot water heater (boiler) that is fully wetted and full of water.I have to make some assumptions....the "twist" knob control is for the temperature which the boiler turns on and off? The zone valves are strictly open/shut. The t-stats contacts are what are probably wired in parallel, so any one of them can call for heat. Does the circulating pump runb all the time? I would have thought so, but I am not there to look for myself.
So, if possible, describe a "normal" functioning of your heating system, by t-stat. That's a good start,. You use "it" as a descriptor, but I cannot determine what "it" might be.
Sorry for your troubles, bbut I have some experience with hydronic systems that may be of help.
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