Re: Re: Re: Re: Re: Another oil furnace question - where's the air come from ?

Posted by John F. on October 07, 2001 at 15:06:21 from (63.254.198.61):

In Reply to: Re: Re: Re: Re: Another oil furnace question - where's the air come from ? posted by John Ne. on October 07, 2001 at 09:20:40:

Based off what you have said, you have an old oil furnace like the one in a trailer I used to live in. If that's the case,,,,,,,,,,,,,,
The air comes in through a tiny cage fan located at the bottom. As long as the furnace is turned on, the fan runs all the time. It has to keep running in order to keep the (pilot light) burning. There is a fire burning in this type of furnace all the time. It's like a pilot light in a gas furnace or gas stove. The carburator has 2 fuel flow adjustments, one for idle (the pilot light), and the other for heat. Since I'm not a furnace man I can't tell you how to properly adjust the fuel mixture. I simply made an educated guess at what it should be. I would turn the furnace on, raise the thermostat so it would allow the most fuel into the firebox, drop in some fire and let it go. This usually took 1 to 2 minutes and there was oil visible in the bottom of the box through the door. I would light it and then I would drop the thermostat back to idle and adjust the fire so that it wouldn't be hot enough to constantly kick the blower on. When adjusting the high side, you don't want flames as high as the door. That would be too hot. Also, this furnace used kerosene only, not diesel fuel. Lighting diesel fuel in a furnace such as this would not be easy.

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