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Intertherm oil furnace in mobile home installed 3.5 years ago. Worked great until the Igniter transformer shorted out 1.5 years ago. When technican changed the transformer he also changed the burner noozle. I had so much soot buildup that the chimney was clogged in 4 months. The CSA panel lists a delavan 0.50 GPH 80 A noozle and the tech replaced it with a Hago #559, 90 degree noozle. Would the different noozle replacement be causing the soot problem? I've had a different tech clean out the furnace and chimney but he replaced the noozle with another 559 and the soot continued. I've since shutdown the furnace until I get an answer and the problem solved, but winter will soon be here.

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Hello,The 90* nozzle is usally installed in miller brand units because of the "short" chamber.The 90* should not cause soot.Soot = not enough primary AIR into the burner mix.If the unit mfg. wants .50/80*a it should be used.#559 might translate into a .65gph input thus overfiring the unit.If a .50gph is installed the AIR mix problem will take care of itself (less fuel).Soot is unacceptable in your (young)3.5yrs unit and should NEVER have soot at all.The problem started when the nozzle was replaced try (insist) on mfg spec. nozzle.

Posted on Nov 08, 2010

Testimonial: "Good advice. My tech will be here tomorrow morning and I have already purchased the proper 50/80 A noozle as required by unit manufacturer. "

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