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Trane package unit 2 stage gas valve adjustment
thegreatcornholio
Member Posts: 25
in Gas Heating
Does anybody know how you adjust the low fire on this valve? There is an adjustment screw under the cap I have been able to set high fire but don’t see where you adjust low at. Just replaced a sooted up heat exchanger on this unit I imagine was caused by the high gas pressure settings in low and high fire. It’s a model 36c76 type 486. The black cap on the side is the vent. It’s on a Trane ysc092a3rma29a
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Comments
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Have you checked the operating gas pressure on the manifold side of the gas valve?
Does this unit have an exhaust vent fan? Check to see if the fan failed after some time and the burner is still firing. That may cause carbon buildupEdward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Looks like a White Rodgers valve. Have you looked through their literature for a similar valve?0
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Is this one of those Roof tops with the power burner where they use negative gas pressure on the outlet side of the valve? If so there are some videos on U tube about that0
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From what I could find the two stage valves have two adjustment screws on top 1 for lo and 1 for high0
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EBEBRATT-Ed said:Is this one of those Roof tops with the power burner where they use negative gas pressure on the outlet side of the valve? If so there are some videos on U tube about that0
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ratio said:Looks like a White Rodgers valve. Have you looked through their literature for a similar valve?0
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EBEBRATT-Ed said:From what I could find the two stage valves have two adjustment screws on top 1 for lo and 1 for high0
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EdTheHeaterMan said:Have you checked the operating gas pressure on the manifold side of the gas valve? Does this unit have an exhaust vent fan? Check to see if the fan failed after some time and the burner is still firing. That may cause carbon buildup0
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@thegreatcornholio
I spent some time searching for that valve with no luck. I think it may be an OEM valve made for Trane.
I suspect lo fire is non adjustable but that is just a guess.
Maybe post the RTU model # and we can find it through Trane
Hate OEM stuff0 -
EBEBRATT-Ed said:@thegreatcornholio I spent some time searching for that valve with no luck. I think it may be an OEM valve made for Trane. I suspect lo fire is non adjustable but that is just a guess. Maybe post the RTU model # and we can find it through Trane Hate OEM stuff0
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I found the manual on line. For two stage all it says is 1.8" wc for low fire and 3.5" wc for high fire that's what it says to set it to. No pictures of the gas valve or how to adjust.
I know a guy that works for Trane if I still have his # I will reach out. Bad instructions piss me off.0
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