Original message
| t1551fo
 |  "Main burners"
, posted Sat 4 Oct 12:40:  
Armstrong sx90 I was measuring 24vac across termial board with recuprative blower running, there was a backfire from gas nozel box, is the main gas valve coming on too soon, or is there a problum with MGV. Thanks for any help
18892
[this message was edited by t1551fo on Sat 4 Oct 12:45] |
| Replies:
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| Jojo98
| "Re(1):Main burners" , posted Sun 5 Oct 00:48
Backfire is usually an indication of the gas failing to light at the apporpiate time. Might have a weak ignitor, or the ignitor, pilot is not set properly to fire off the gas until the chamber is overflowing. I would try and move the ignitor closer to the burner.
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