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Old 10-01-2012, 11:49 PM   #16
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nothing good gonna come of this.... my lips are sealed.... read some books ...fast....
agree carmon i was trying to be nice...but he's going to dig his own grave.....hope they have mercy on him

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Old 10-02-2012, 12:01 AM   #17
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hum, I am reading a book, the text book from when I got certified. what am i missing? If this book is incorrect I need to know. When we were doing labs in back in school that is what we looked for.

edit
ok I just had it backwards i was think lp but saying natural. then I started reading carbon dioxide content went off there for a while.
so 3.5 in. WC

So back to my original question, no combustion analyzer huh?

Last edited by wetbar; 10-02-2012 at 12:31 AM.
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Old 10-02-2012, 01:08 AM   #18
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hey one last question was thinking about purchasing the fieldpiece addon manometer since I have all the other heads

http://www.hvacr-tools.com/product/f...accessory-head

what do tall think about the digital over the gauge? It does not cost that much more, but is it worth the extra?

other recommendations?
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Old 10-02-2012, 01:22 AM   #19
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The fieldpiece manometer is cool, unless the batteries get low or your meter gets stolen, then the head is useless
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Old 10-02-2012, 05:07 AM   #20
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What do you mean pressure? Nat gas is 11.7 - 12.2 of WC for perfect combustion. I know Propane is a little higher, but we mainly see natural gas around here. Am I wrong?
Nat gas is not 11" at the manifold. Look at the data label on the gas furnaces you currently work on. Inlet pressure may be listed that high, but manifold will be listed as 3.5". The pressure variance will be listed to be between 3.2 and 3.8". if you need to adjust the manifold pressure lower or higher then that, then you are suppose to increase or decrease the size of the orifices, to allow for the BTU content of the gas in your area.

If you didn't know any of what i just typed. then you really do need to get more training on gas furnaces, before you do set ups, and before you do too much more servicing of them.

Few sealed combustion furnaces can have their manifold pressure checked by just connecting the manometer to the manifold side of the gas valve.

I find very few pressure switches that are actually bad, usually, something else is wrong.
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Old 10-02-2012, 08:07 AM   #21
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This is related to photography .... means not shooting in automatic (A)
Photography was a strong hobby of mine many years ago...and now it's firearms.....it could have gone either way!

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