Pressuretrol settings

LARRY_32

Had a new Burnham V84 replacement oil boiler installed. Have a single 2" main steam line. Had problem of extensive "short cycling". Latest attempt to correct was to replace pressuretrol for a Honeywell L404F. Initially seems as if short cycling has been reduced. Service man set Pressuretrol Diff. at 5psi and the Main at 5psi. Is this too high for a house? Any potential problems/damage with these settings? I thought settings should 2.5psi and 0 psi.

LARRY_32

HONEYWELL L404F SETTINGS

Had a new Burnham V84 replacement oil boiler installed. Have a single 2" main steam line. Had problem of extensive "short cycling". Latest attempt to correct was to replace pressuretrol for a Honeywell L404F. Initially seems as if short cycling has been reduced. Service man set Pressuretrol Diff. at 5psi and the Main at 5psi. Is this too high for a house? Any potential problems/damage with these settings? I thought settings should 2.5psi and 0 psi.

carol_3

I don't know this control. I'll see if I can find a product specialist for an answer.

Dan_29

pressuretrol settings

The pressuretrol should be set at .5 cut-in and 1.5 lbs cut-out. Your tech set it at 5lbs psi because he did not want to solve the problem. See the "steam problems" section at the top of "The Wall" page. It has several possible causes which should be investigated. Cranking the pressure up is a misguided tech solution that wastes fuel.

Dan

carol_3

The product specialist at Honeywell says L404 is a commercial control and also mentioned the Empire State Building for the 5psi.

He says that the typical home uses a PA404, usually set them in the 1-2psi range and set the differential as small as possible (1-5psi diff most models).