LP Gas Orifice Size

[autoapprentice]

Hi all,

I've been having a hell of a time trying to repair our furnace (The HVAC guy wanted $875.00 plus). It was converted to LP gas and I am having trouble figuring out which orifice size to use. Any ideas? The part is Honeywell Q3450C1185.

 

[Dinoburner]

So many questions, what size orifices do you have for that pilot assembly. those cap orifices will have a number stamped on them. What about the main burner orifices? What is the btu input of the furnace? Is this a repair or an installation?

 

[Fitter30]

Heres a chart lp runs at 11" if you have 4 burners 1 00k furnace 25k per burner ,pilot .010 - .016. Orfices can be drilled out just use a pin vice to hold the bit and use your hand to turn the bit.
https://andersonforrester.com/conversion-chart/

 

[Dinoburner]

Heres a chart lp runs at 11" if you have 4 burners 1 00k furnace 25k per burner ,pilot .010 - .016. Orfices can be drilled out just use a pin vice to hold the bit and use your hand to turn the bit.
https://andersonforrester.com/conversion-chart/

True except for stamped orifices. If those are drilled the flame characteristics are changed. A jewelers broach can be pushed in to clean them or increase size.

 

[autoapprentice]

It has three burners, here is the information on the side of the unit.