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 Post subject: Re: Furnace Fumes
PostPosted: Sat Dec 09, 2017 11:31 am 
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Joined: Fri Sep 07, 2012 12:46 pm
Posts: 1500
Location: Back in South Carolina
OR Year: 2012
OR Model: 391RES
Member ID: ORF-1894
Friends had a house that gas logs were set up for natural gas and they used propane and had same smell and soot issue. May be the wrong fuel?

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Larry and Jo
Just us and Sweet Pea (kitty)
2012 OR 391RES/2015 White Ford F250 6.7 diesel crew cab
Full time over :cry: New stick built in South Carolina
"Enjoy it while you can! We're not promised tomorrow."


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 Post subject: Re: Furnace Fumes
PostPosted: Wed Dec 13, 2017 12:30 pm 
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Joined: Sat Nov 08, 2014 11:46 pm
Posts: 2133
Location: Central Coast of CA
OR Year: 2015
OR Model: 337RLS
Member ID: ORF-5907
I assume this is not the first time you have used the furnace. Propane burning black soot is an indicator of low secondary air flow to the burner, resulting in the soot and unburned propane, thus the smell and alarm.

Several things can be the cause of this.
The cheapest is bugs have nested in the burner system and need to be cleaned out.
The next could be the regulator, since you have changed this out, it MOST LIKELY is not.
The last would be a failure of the valve.

My first thought goes to bugs in the burner assembly, blocking the primary airflow. Ever use an oxy/acet torch? When you turn on only the gas and light it, it creates a LOT of soot until you open the oxygen valve. Same concept applies to a burner assembly, but since we never mess around them it should never get out of adjustment. Mud daubers seem to love getting it there.

I'd pull it out and pull the burner assembly apart and clean. If it's bugs, it will be obvious, but look it over completely to make sure.

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