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Problem with \"Flashback\"
of a Utica DV50BLP boiler, power vented. After running for a few minutes the gas flame will flashback in the burner, burning at the orifice. There is no air shutter on this burner. If I shut if off and restart it will be fine for as long as 10 to 15 minutes then it flashs back again.
I have the LP gas pressure set at 10.0" W.C. with a 47 drill size orifice, single burner 50,000 BTU's. Specific gravity 1.52 BTU content 2550 BTU's per cubic foot.
This is a side wall vented unit air for combustion from within the building and there is plenty of air as this is a big wide open garage area.
Combustion analysis CO2 9.5%, O2 4.8%, Flue gas temp 250 degrees CO 25 PPM air free.
I have tried everything to solve this problem nothing works. Any ideas?