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Flame Roll Out switch - can heat transferred through metal housing trip them?

Flame Roll Out switch - can heat transferred through metal housing trip them?


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Old 02-17-08, 04:00 PM
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Flame Roll Out switch - can heat transferred through metal housing trip them?

My flame roll out switches, on a goodman GMP furnace, appear to being tripped occassionaly, I beleive due to the metal housing that the flame roll out switches and gas valve are mounted on - getting too hot. (I see no evidence of flame roll out as I watch the flames, and there is no burning of wiring, or other charring or black spots in the furnace cabinet. I must note tha on 2 occassions I had to remove a dead bird from the vent blower assembly, and I am hoping that is the end of the flame roll out switches tripping, but I thought I'd ask for opinions here - just to be sure.)

I put my finger on the sheet metal for only a couple of seconds, before it felt like it was starting to burn my finger. Is this normal?

Could this heat transfer in the housing the sensors are mounted on (as opposed to direct flame) cause the roll out switch to trip? If so, could this be due to dirty flame housing, or something else, causing too much heat transfer from the heat exchange, or blower orifices?

I felt the heat buildup on the metal housing on a newer, 5 year old amana furnace, and the sheet metal that the roll out switches, and burners mount to, did not feel as hot.

Here is a picture, the red arrow points to the flame roll out switch mounted on the steel housing:

 

Last edited by mnalep; 02-17-08 at 05:15 PM.
  #2  
Old 02-18-08, 04:34 PM
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Then this would constitute a design flaw. I doubt that is the problem, without there being an underlying problem involved, that is forcing, not necessarily the flame, but more heat back out, rather than being drafted by the inducer.

But simply due to heat exposure, over time they can get weak. They are reasonably priced. Try a new one first and see.
 
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Old 02-18-08, 06:00 PM
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Installation manuals nowadays are very specific regarding dimensions, materials and lengths of vents. If not followed precisely as the manufacturer indicates in their Installation Manuals, problems such as the one you are reporting are not unlikely to occur.

You should have the installation manual of your unit right by the unit itself. Look at the details for the sizing and installation of the vents. If what you have there does not follow mfr recommendations, beware.
 
 

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