Friday, 15 January 2021

Furnace output higher than plate rating?

I have a variable speed blower + 41K BTU output on 1st stage furnace.

The blower is set to 1000 CFM for 1st stage. Altitude about 100ft.

1000 cfm x 43.3F temperature rise * 1.08 = 46,764 BTU

That's roughly 14% higher than the plate rating. Is that within the margin of error given the accuracy of the inputs? Or could something need adjustment?


source https://hvac-talk.com/vbb/showthread.php?2225761-Furnace-output-higher-than-plate-rating&goto=newpost

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