Bryant Model 394gad048125


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Old 12-13-09, 04:37 PM
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Unhappy Bryant Model 394gad048125

I have Bryant Model 394gad048125. Almost every time it starts it makes a loud noise (like explosion noise). Other then that it works fine.
 
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Old 12-13-09, 04:42 PM
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Originally Posted by dominickcao
I have Bryant Model 394gad048125. Almost every time it starts it makes a loud noise (like explosion noise). Other then that it works fine.
I have adjsuted the gas valve but did not help. The pilot light always on. I need help
 
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Old 12-13-09, 05:13 PM
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What did you do to the valve?


The manual for your furnace is here:

http://www.xpedio.carrier.com/idc/gr...i394g-25-1.pdf


Most of these furnaces had an intermittent pilot ignition system, that lights the pilot each time the thermostat calls for heat. A few were match lit, where the pilot light stays lit when the burners are off.


Does you pilot burner have a thin copper tube going back to connect with the gas valve?

Or does it have three wires, red white and green that connect to a white plug near the pilot burner?
 
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Old 12-14-09, 08:50 AM
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Originally Posted by SeattlePioneer
What did you do to the valve?


The manual for your furnace is here:

http://www.xpedio.carrier.com/idc/gr...i394g-25-1.pdf


Most of these furnaces had an intermittent pilot ignition system, that lights the pilot each time the thermostat calls for heat. A few were match lit, where the pilot light stays lit when the burners are off.


Does you pilot burner have a thin copper tube going back to connect with the gas valve?

Or does it have three wires, red white and green that connect to a white plug near the pilot burner?
It is match lit type. The pilot stays on even burners are off. Thank you for the manual it is good to have.
 
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Old 12-14-09, 08:56 AM
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So the circuit diagram for your match lit furnace would be on Figure 5 of the manual.


What did you do to the gas valve and why?
 
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Old 12-14-09, 08:58 AM
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If your not sure of what your looking at and don't have a working knowlege of gas furnaces I would suggest having a qualified service tech take care of this one.
 
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Old 12-14-09, 05:44 PM
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Originally Posted by SeattlePioneer
So the circuit diagram for your match lit furnace would be on Figure 5 of the manual.


What did you do to the gas valve and why?
I close the gas valve slightly thinking that too much gas may cause the loud noise but it still happens.

I will review the Figure 5. Thank you
 
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Old 12-14-09, 09:00 PM
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What you are describing is called "delayed ignition." It happens when the main burner gas doesn't light promptly

The gas then accumulates and eventually lights, with a whoosh or a boom.


That can be caused by either a failure of the pilot light to ignite the burner, or a failure of one burner to light another.

Does the pilot flame look like a small blowtorch, or does it have a soft flame like a candle flame that is easily blown around?


More than likely you should removed, disassemble and clean the pilot burner and pilot orifice, and remove and clean the gas burners. Those are things that probably need to be done in any case, and will probably solve the problem if you do a good job on these tasks.
 
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Old 12-15-09, 11:44 AM
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SeattlePioneer

Thank you for your suggestiongs. I'll disassemble and clean the pilot burner module and gas burner module. Once that's done I'll record the new pilot flame.

Currently, the pilot flame looks yellow-ish. Should it be blue-ish?

Thank you for help!
 
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Old 12-15-09, 01:46 PM
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Yes, it should be blue, and with a sharp fame like a small blowtorch.
 
 

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