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Bethlehem boiler
![Chris R. Halcro](https://secure.gravatar.com/avatar/675ced6f4d102564ce5f2ca80827f1f2/?default=https%3A%2F%2Fvanillicon.com%2Fed770da7fe18db401e312740a738b0e1_200.png&rating=g&size=200)
Chris R. Halcro
Member Posts: 3
The chimney is not blocked, and yes that is a plus .5 pressure. It did drop to a .35 when the cap was removed. Thanks again. Chris.
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Comments
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Bethleham boiler
I have been trying to help a private school with a boiler problem. The boiler sounds like a double A fuel dragster while in operation. Has been this way since it was installed in the sixties, I guess. It is about 6,300,000 btu firing capacity by the name plate rating ( for fuel oil ), operating on Nat gas. The stack is 16 inches by about twenty feet tall. Back preesure at about 1 foot above breech is .5 inches on low fire. Changing air fuel mixture doesn`t help until theres almost no gas in the mixture. Is the stack way to small? Another one of my customers bought an almost identical boiler made in the 80's that has a 24 inch stack. Both are two pass boilers. Thanks, Chris.0 -
bethlehem
Is that +0.5"WC? I don't mean to sound stupid but are you sure the chimney isn't blocked?0 -
stack size
I'd check the manufacturers specs. They usually have a vent sizing spec.0 -
Bethlehem Boiler
Do you have any exhaust fans operating that would cause poor venting? Do you have enough make up air? Is it possible you are over fired? Do you have good quality fuel? I had a situation where a building maintenance man would pour waste oil into tank. This increased the btu content of the oil resulting in poor combustion and draft. Also, a chimney too large (in diameter) or too short could also be a possibility.0 -
Bethlehem Boiler
This boiler is operating on gas only. If I slowly close the gas valve the rumbling will stop when its almost shut. At that point it's lost about 10 percent in efficiency and there is almost no flame.0
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