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Posted by on November 27, 2006, 2:01 pm
>Modine unit heater. Burner short cycling. I check my pressure switch that
>closes at .91", and get an approx. .60 reading. Check flue, sure enough it
>is plugged up with a birds nest. Clean it out, and re-check pressure, I get
>above a 1" reading. But when burner fires, the pressure drops to about .80.
>The pressure switch is definately bad, because even after cleaning the flue
>with a 1" reading, the switch wouldn't close. I have one on order, but I am
>concerned about the drop in pressure after the burner fires. Is this normal?
>Or may I have heat exchanger problems. I didn't see any visible cracks, but
>it was bright as hell in this room when I was checking it. It is a hot house
>for flowers. Thanks in advance.
>
>Rich
>
hey I'm guessin here but when the furnace fires, the exhaust is warmer
than the disch. from the inducer. being warmer, the exhaust is
lighter, causing less static?
you said a flower shop, that translates into higher humidity than
normal. humid heavy air thru the inducer vs furnace exhausted air
thru the inducer.
you can still sell them a heat exchanger inspection !
http://www.visibledefects.com/online-store/scstore/index.html
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