Posted by Robert on October 24, 2001 at 10:06:35:
I have a Cleaver Brooks 125 hp firetube boiler generating 100psi steam. This morning I discovered that after blowing down boiler and after prepurge boiler came on line as normal but went to 100% fire even though it was set to only go to 50%. In automatic mode it is bypassing the preset setting (ignoring it) and continuing to 100% fire. When I switch to manual mode it will stop at the preset mode of 50% fire. Where should I start looking for the problem? Modulator motor?