Posted by jtown on January 02, 2000 at 09:38:20:
In Reply to: Soot on boiler posted by Brad on January 02, 2000 at 08:30:23:
Make sure that the chimney gets a good inspection. You have a low fuel to air ratio, just like cars blowing soot from a stuck choke. If the boiler hasn't been cleaned in a long time it may just be years of build up and dust that cut the draft that pulls in air, your flame could be hitting a surface, cooling it so it doesn't finish (good source of CO). Your burners could be dirty for poor mixing or air inlets blocked with hair from the pet that sleeps there. The room could be so tight that there is insufficient air to burn. An aluminum flue liner might be called for if you have a beat old masonry chimney with the mortar being eaten by acidic flue gas condensation. Also make sure there are no openings into the flue but that appliances connector.