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Cycle rate for high fire, two stage gas valve
Well, I've mostly given up any desire for modulating the firing rate of my boiler, it's just too complicated & expensive for the benefits. So, I've set my sights on staging! My initial thought is to bang high fire in & out with a pressure switch, set somewhere in between the cut in & cut out pressures. I've drawn up a ladder diagram, based on the Dwyer control as seen here.
(I seem to have lost the original thread)
Line four is the sole addition, and will be be nothing more than one pressure switch identical to the cut in & cut out switches. Will this simplistic control cause problems by cycling in and out of high fire too rapidly, or do I need a more sophisticated control such as a switch with adjustable hysteresis?