cardinal wrote:When Thermostat calls for heat stoker operates with circulator, I know its anticipating heat .
I have radiant pex tubing with 120 water temp, boiler water temp could be at 190 and stills runs with circulator running
Do all the new efm boilers get set up this way. I could see a oil burner set up this way, but why a stoker . I would like to set up aqua stat to start stoker on the low limit and shut off on the high limit and let the circulator do its own thing ,is this possibly. I have a L7224 electronic aqua stat and a Taco 503 three zone switching relay My fourth zone is wired directly to aqua stat All the zones operate the same way with circulator
It should operate the stoker on a temperature fall from the high limit only after it falls beyond the differential set point
. The reason is on a long or multiple calls for heat, you may bring the boiler temp well below the low set point which would lock out your pump until the low set point is reached again. I would make sure your differential settings are correct and working properly before re engineering anything.