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Old 09-10-2022, 02:06 PM   #1
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Cleaning an Atwood 8535 IV furnace

On a long trip last March, much of which was below freezing the main furnace carboned up. I have taken the cover off several times and just stared not knowing where to begin cleaning it. Now with summer passing and fall rapidly appraoaching is the time to fix it. I have a parts diagram and visibility into the burner side of the heater.

Attached is a photo showing the valve / burner. My question is: do I simply start removing and cleaning parts? Are there any gotchas in this process?
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Old 09-10-2022, 02:24 PM   #2
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Disconnect DC wires to gas valve solenoid
Disconnect High Tension wire to spark electrode
Propane source valved disconnect gas line at flare nut leaving elbow attached
Remove screws on plate and remove whole complete burner assembly

See pg 25
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Old 09-10-2022, 04:18 PM   #3
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Thank you. There are two screws holding the propane valve / ignitor / flame assembly in place. I was able to disconnect the two wires, one valve and one ignitor. I was able to loosen the propane connector. I then removed two sheet metal screws holding the valve / ignitor / burner assemply in place. From there it was vacuuming and flushing out with an air compressor. When done it looked clean and functional.
(The only remaining issue is reattaching the two sheet metal screws. They are not magnetic so they fall out ot the socket while trying to install. This is manageable so I will figure it out. Today is 95 so no furnace is needed. )
Thank you again. Dan
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Old 09-10-2022, 06:45 PM   #4
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A little dab of grease will hold the screw to the screwdriver.
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Old 09-11-2022, 08:43 AM   #5
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Dah... I was going to HD and buy steel replacement screws. They are hex head so I would use a magnet on one end of a socket and hold them in while I started them in the sheet metal. I think the grease idea may be quicker. Thanks.
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ace, atwood, furnace

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