Adjust pilot size on Bryant 80-394U

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Old 11-26-12, 05:36 PM
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Adjust pilot size on Bryant 80-394U

I have a Bryant 80-394U (older model) gas furnace running of city gas at home. Most of the time it works, but I have the impression that the pilot should be a bit larger.
Occasionally, the pilot comes off, but that doesn't happen too often.
Whenever the thermostat turns on, it seems to take fairly long until the pilot actually ignites the gas - it almost sounds like a small explosion.
I wonder if a larger pilot flame could solve this problem.
Although, the thermocouple seems to get enough heat from the pilot flame.
I have 2 questions:
  1. How large/long should the pilot flame be (in general or for this particular model)?
  2. How do I adjust the size of the pilot flame? I don't find any documentation on this.
Thanks a lot!
 
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Old 11-26-12, 05:53 PM
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Usually need to clean the pilot orifice for this.
The flame should not have yellow tips. It should be blue.



It is necessary to remove the 1/4 inch tube below it to access the pilot orifice.
 
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Old 11-26-12, 06:01 PM
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Thanks a lot for your reply.
The pilot looks similar to the right hand picture.
What is the size scale in that picture? How long are the flames shown?
 
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Old 11-26-12, 06:10 PM
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The manual for your furnace is at
http://www.docs.hvacpartners.com/idc...it/39394d1.pdf


If you don't have a copy of that, I'd recommend you print it out and keep it at the furnace.


I take it you have an intermittent pilot ignition system on the furnace, which lights the pilot only when the thermostat is calling for heat.


Very likely the pilot burner needs to be taken out, the pilot orifice removed and the pilot burner and orifice cleaned.

You need to remove the screws that hold the pilot burner in place, gently bend the pilot tubing to bring the pilot burner out where you can work on it, and remove the brass fitting at the bottom of the pilot burner that holds the pilot tubing into the pilot burner. The pilot orifice is inside the pilot burner and will usually fall out into your hand for cleaning.
 
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Old 11-26-12, 07:06 PM
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The pilot orifice fits at the very end of the pilot tubing and is held in place by that brass nut that also holds the pilot tubing in the pilot burner. The pilot orifice has a small hole that meters out the gas for the pilot flame and forms it into a jet of gas. I clean the jet with a wire from a wire brush.
 
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Old 11-26-12, 07:33 PM
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Thanks a lot for the reply and for the manual.

In the manual it says in the section that describes pilot adjustment: If the valve is equipped with an adjustable screw...
How do I know if it is?

I take it you have an intermittent pilot ignition system on the furnace, which lights the pilot only when the thermostat is calling for heat.
No, that is not the case. The pilot is (or, at least, should be) on permanently.
 
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