|
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
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
>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