old backfiring stove - http://www.hvacmechanic.com/ Forums
Original message
| john deere
 |  "old backfiring stove"
, posted Fri 7 Nov 22:55  
I have a old warm morning stove that heats very well for my old house. It lites good smooth and even,but when it goes to shut down it shuts off the flame goes out looking at it by the front glass. About 3 to 4 seconds later it flames back up and blowes its self out like a back fire with the noise. Watching it closely from the side panel it seams like the fuel valve isn't shutting off all the way and relights and blows its self out. there is no gas smell after it finally goes out.
I have replaced the gas valve on the stove, cleaned the burner, checked orfice on pilot line,adjusted the air valve on the burner, replaced outside low p.s.i. regulator and set it to 11.5 on gas water collumn gauge
If you have any advice i would greatly apprciate it, thanks.
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Replies:
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| Ad Mech 2
| "Re(1):old backfiring stove" , posted Fri 7 Nov 23:36:
Not positive I know what appliance your talking about, but try adjusting the primary air (where the burner orifice is at) if the burner assembly has one.
Have seen instances in the past, on gas fireplaces, where there was not enough oxygen being supplied at the burner (too rich).
The flame will go out initially, but leftover, unburned gas can be superheated back up to the lower explosive limit by the hot combustion chamber and reignite.
A too-rich burner can be indicated by a slow or 'lazy' pattern at the burner when it shuts down. A slow-closing gas valve will appear similiar (normal), so consider that before taking action.
Randy
[this message was edited by Ad Mech 2 on Fri 7 Nov 23:41] |
| | john deere
| "Re(2):old backfiring stove" , posted Tue 18 Nov 00:24
I have found out that when i unhook the fitting from the burner to the valve. I can light the gas leaking past the seat from the valve when its turned off. the small flame will burn for about 1 1/2 minutes or so before it finally seals.
so when the flame goes down it doesn't go out completely, and catches enough air at the orfice and relights ( i think that what it's doing)
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| | Xenos
Webmaster 
| "Re(3):old backfiring stove" , posted Tue 18 Nov 17:32
This does not sound normal ,sounds like your valve needs replacing.
Xenos.
The best way to escape a problem is to solve it.
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