Posted by jtown on October 08, 2001 at 08:10:03:
In Reply to: Pilot Light Come Back posted by ScottJ on October 07, 2001 at 20:36:29:
Gas company and professional in the same sentence? Your gas line being 1" is probably fine. I would be looking seriously at your venting. It is probably marginal at best and the blast from your boilers delayed ignition is blowing the pilot out sometimes and maybe other causes such as wind at other times. If you are into an old masonry chimney you should drop B-vent down it or a flexible liner (not as good thermally) sized for the combined appliances. Limit horizontal connectors in the basement. Terminate at least 3ft above the roof and 2ft above any roof within 10ft and extra if you have something funny like another story or tree just outside the 10ft. If a short house, go the minimum height also. See if you can run the water heater vent separately out through a window etc temporarily if needed. Make sure there is adequate air to the space. Don't leave a door open while checking. What is Btu/hr of both appliances, diameter, horizontal and vertical from blr to chimney, where does wtr htr vent come in? What is chimney material, height and cross section? Amount over roof? It doesn't take much to blow out a pilot.
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