coal stoker wrote:...
I also have a problem, i am trying to figure out why my DHW temp is through the roof.
It is like the aquastat on the indirect has no effect,
Then it dawned on me, I think that the circulator I have between the boilers is forcing in past the DHW circulator and pushing the DHW to my high limit setting.
I am no expert but this makes sense to me.
Just need some help before someone gets hurt.
I also lowered the 3 speed to the lowest setting, hoping this will help with forcing past the DHW zone circulator.
Thanks in advance,
This happens with my indirect too, unless there is a constant call for heat (like today - in the single digits outside). I replaced the internal flow-check in the Taco circulator, but that's not enough to hold back the stoker's Taco circulator - it just forces the water right past on warmer days, and DHW temp will be whatever boiler temp is. Over 150° sometimes.
I've got used to it. The fact that this ghost-flow stops on a high heat demand actually works out better for me. Our house is poorly insulated, so the baseboard heaters need all the help they can get.