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Old 03-24-2023, 10:23 AM   #1
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Black smoke from Atwood furnace

we have an atwood 8535iv dclp furnace. noticed black smoke coming from the exhaust. i pulled and cleaned the burner tube. spent the winter in windy yuma,az. looks like a lot of sand and dust got blown into the burner tube. cleaned and vacuumed the exhaust port. still have a bit of black smoke. any reason i should be concerned with a blockage and possible fire danger? i'll keep checking the burner tube area for additional debris, and vacuum as needed, but i don't want to have a fire hazard
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Old 03-24-2023, 11:02 AM   #2
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Black smoke means your burner or pilot is not getting enough combustion air. It may be as simple as cleaning the gas jet to get a good straight gas stream that pulls in and mixes the air. Good Luck DR
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Old 03-24-2023, 11:04 AM   #3
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As you implied, black smoke means too much gas and/or not enough air in the burner mix.

Still seeing black smoke, means there is still too much gas. Do a better or more extensive cleaning job.

It is possible the gas jet has been damaged by inserting something into it or other non-approved cleaning method.

Smoke inside will eventually compromise the furnace burner function.

I wish you good luck and happy trails ahead!
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Old 03-24-2023, 11:20 AM   #4
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Old 03-24-2023, 01:51 PM   #5
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There is an adjustable slider for air coming out of the gas valve before the combustion chamber. Usually very accessible. Loosen the screw and open it a little more.
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Old 03-24-2023, 02:19 PM   #6
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so can you tell me where the gas jet is located? the only area i cleaned was the burner tube.
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Old 03-24-2023, 04:15 PM   #7
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There is an adjustable slider for air coming out of the gas valve before the combustion chamber. Usually very accessible. Loosen the screw and open it a little more.
Sorry , on your furnace there is no air adjustment. Has to be an airflow restriction . If your other propane devices are normal itís not too high of propane pressure, ie the regulator at the tank. Again sorry
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Old 03-24-2023, 04:28 PM   #8
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i replaced the regulator a couple months ago. the stove flame seems to be the same as before i replaced it. where can i check for any air restrictions? again, other than sooting, is there a fire danger?
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Old 03-24-2023, 04:32 PM   #9
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i replaced the regulator a couple months ago. the stove flame seems to be the same as before i replaced it. where can i check for any air restrictions? again, other than sooting, is there a fire danger?
In reading pulling the furnace and looking for bug blockages in the air intake is what is recommended. Wait until Old Biscuit chimes in. He is a master on this stuff.
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Old 03-24-2023, 07:51 PM   #10
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looking forward to his input
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Old 03-24-2023, 08:13 PM   #11
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Don't forget to look at the pilot for a lazy orange flame. The soot could just as easily be from the pilot. DR
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Old 03-24-2023, 08:38 PM   #12
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Gas Orifice screws into the end of the Gas Valve
It is a brass nozzle.......precision drilled to meter the correct amount of gas flow to match the combustion air flow

Proper air/fuel ratio is dependent on the orifice being clean/unobstructed
*a spider web can disrupt the flow

All Atwood & Dometic 35,000btu furnaces use the same size orifice (#51)

To clean...remove orifice from gas valve and soak it in alcohol then air dry
No poking anything thru it, No High Air pressure ---LP pressure is only 0.39psi (you can blow that hard by whistling)
*Gas valve is only rated for 0.5psi MAX

Since furnace is sooted up...you can blow out the heat exchanger using AIR Pressure

Also check the 'combustion' air wheel....no debris, ALL vanes intact and wheel is secured to motor shaft
*Missing vanes or loose ........insufficient air flow


https://pdxrvwholesale.com/products/...iv-tune-up-kit


Side Note: No pilot....electronic ignition via spark electrode
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Old 03-25-2023, 11:52 AM   #13
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i'll pull the gas valve when i can chase down a compressor. appreciate the advice again
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Old 03-25-2023, 02:02 PM   #14
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i'll pull the gas valve when i can chase down a compressor. appreciate the advice again
You usually can get to it without pulling the valve. Pull the aluminum tubing off going to the furnace burn box. Itís in the valve rt at the beginning of the tube.
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