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Tool Talk Discussion Forum

Furnace pressure setting

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Roy Suomi

10-13-2007 12:40:52




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I was servicing my oil furnace in my barn..The gauge reading was 185 at the pump..Is that enough? or needs to be tweeked?? I installed a nozzle , fuel filter , and air filter , and vacuumed out the heat chamber..It only runs about 40 hours during the winter for back-up heat when the wood burner dies down...




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Bob

10-13-2007 12:56:25




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 Re: Furnace pressure setting in reply to Roy Suomi, 10-13-2007 12:40:52  
The standard oil pressure for oil burners has always been exactly 100 PSI. It's best measured with a gauge "tee'd" into the line from the pump to the nozzle. However, the reading at the "air bleed port" will be pretty close.

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In the last 10 years, or so, some "high efficiency" burners, Weil-Mclein is one example, have tweaked the pressure up somewhat, for better atomization of the fuel. There is a chart for the "overrating" of the nozzle's flow at higher PSI's, as they will flow more than the volue stamped on them, when used at pressures higher than 100 PSI.

However, almost certainly, if your furnace is older than that, the fuel pressure SHOULD be 100 PSI.

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Roy Suomi

10-14-2007 04:47:08




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 Re: Furnace pressure setting in reply to Bob, 10-13-2007 12:56:25  
Thanks , I'll have to crank it down to 100 psi..I haven't screwed around with these pressures before..It's the way I bought the furnace from a guy that changed over to gas..



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