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Posted by HeatPro on December 30, 2007 at 13:54:52:
In Reply to: Re: Steam boiler using water posted by Bruce on December 28, 2007 at 17:58:53:
: Thanks. I checked and when the boiler cycled the pressure gauge peaked at 3.5 psi. The Honeywell controller PA404A-1009 is set to 2.
As the 1009 is a replacement for the 1033, it should have a subtractive differential, so the pressure should stop at 2, except for some over-ride by the excess metal heat at the end of the cycle. Tweak the pressure down to 1-1/2 by turning the square screw at the top to see if it results in getting the pressure a bit lower - or if the control is bad. With the differential knob inside adjusted to minimum, the control should work normal with no skipped cycles - if not, time for a new one; you need a dependable, safe pressure control.
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