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QUESTION:I have a new Cozy natural gas floor furnace. A small one, rated at
50,000 BTU input.
The instruction manual says to change the orifice size depending on the
elevation.
Changing the orifice size slightly does what? Going to a smaller
orifice will use less gas? Or more gas?
Smaller orifice means hotter flame? Or cooler flame?
The manual says to use an orifice size of .120 inch for elevation of
4,000-6,000 feet. It says to use size .116 inch for elevation of 6,000-
8,000 feet.
I live at an elevation of 5,400 feet. Could I use the .116 orifice
safely and at the same time save on my heating bill? Could I go even
smaller than .116 and have positive results? How small could I go?
What are the negatives about using an orifice .004 inch smaller than
the manual recommends? What are the positives?
Finally......my "bottom line" question.....can I save money on heating
by going to a slightly smaller orifice than the manufacturer calls for?
ANSWER: It is my guess that you are talking about the orifice for the gas? If so,
the air that will be mixed at a higher elevation has a slightly lower oxygen
content ... so ... less gas for less air/oxygen is my guess.
I would not consider messing with what the manufacturer recommends for their
furnace. If it is a high efficiency gas furnace, those things are pretty
well tuned already - anything we would do will more than likely make things
worse.
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