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Rufus
Honeywell L404F Main & Differential is Subtractive Settings
Rufus

Have Burnham steam furnance IN6 installed in 2012. The settings on the Honeywell pressuretrol main 3.0 and differential which is subtractive is 1.5

They seem to high as he rad,s valves where sizzling last winter. This is a low pressure boiler.

What would be the best settings?

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