burners popping


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Old 12-30-11, 09:15 AM
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burners popping

I have a very old Comfort Aire combo unit outside my house.
I can't afford to replace. On SS etc. so I need some help.
The, I believe they are called ribbon burners, are popping badly.
I put in a new ignitor (spark style) lights ok with pops as burners fire up they do tend to bang.
I pulled them and cleaned.
I have adjusted and re re re adjusted the air intakes with very limited results.
One burner will pop and blow the next out, work ok for a while and a completely different buner will start popping.
Inducer motor seems to be working OK.
Is this due to the age of the burners? Burner alignment?
Gas valve? Gas pressure? I have checked for leaks.
Robert Shaw control? I have tried a couple I had. Doesn't seem to matter.
Please any suggestions?
 
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Old 12-30-11, 09:38 AM
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"Popping" I don't recognize.


"delayed ignition" occurs when the main burner gas turns on but the burners don't light promptly. When they do ignite off a neighboring burner, they tend to light with a bang or small explosion.

"Flashback" occurs when the gas doesn't burn on the top of the burner where it should, but flashes back to burn in whole or part in front of the burner near the burner orifice. This produces a noisy growling kind of sound.


If those don't sound like it, you need to observe with more care what is happening and describe it in additional detail.
 
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Old 12-30-11, 10:08 AM
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I think you've pretty well nailed it.
I think I can get the ingition part going if I pull it apart again.

The "Flash back" is what I'm getting.
That being identified what are the nomal causes?
Is there a troubleshooting sequence?
Why does it seem to go from burner to burner?
Thanks for your reply.
Jan
 
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Old 12-30-11, 10:35 AM
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Fuel gases burn at a certain number of feet per second.

Engineers take that into consideration when designing furnaces. Gas is squirted into the burner with a burner orifice that keeps the fuel gas velocity high enough to suck in air along with the gas at the primary air shutter and still burn on the top of the burners.

If something reduces the velocity of the gas it can cause flashback.

You may have a problem with dirty burner orifices, a defect in the electric gas valve or you may have caused problems by adjusting the primary air shutters (which are important to have adjusted properly)

Probably best to have a skilled repairman inspect and set up the equipment properly at this point.
 
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Old 12-30-11, 11:13 AM
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Thanks,
I'm a great believer that most problems are caused by
simple things.
I'll go back to the intakes and see what I get.
Then move on from there.
Thx again.
 
 

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