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Open Roads Forum  >  Tech Issues

 > How to Remove Atwood Furnace?

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99damon

Colorado

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Posted: 04/05/10 10:40pm Link  |  Print  |  Notify Moderator

So, the Maintenance Manual says to check the gap on the igniter & flame sensor, inspect the ceramic base for cracks, and check the combustion chamber for damage.

But it doesn't tell you how to actually get to all of that. My furnace fires up and almost immediately shuts off the gas. Maybe the motor is running too slow (seems like it is), maybe something else.

I'd really like to expose the various components, but the book is silent on how to do that. I'm thinking, remove the whole thing and put in on the work bench.

How? Removing the cover exposes the motor and gas valve, and not much else.

If you have ever actually done what the book says (put your eyes on the guts of your furnace), can you give me some clues?

Mine is an Atwood 8500 series, circa 1999.

Thanks much.


Wayne
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1999 Damon Intruder 341

Dutch_12078

Great Sacandaga Lake, NY

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Posted: 04/06/10 06:43am Link  |  Print  |  Notify Moderator

The 85xx burner assembly is relatively easy to remove for inspection, adjusment, or replacement with the furnace in place.

1. Turn off the power and gas.

2. Open the outer door.

3. remove the draft shield.

4. Disconnect the gas line from the solenoid valve.

5. Remove the four screws holding the burner assembly and the combustion fan housing cover in place.

6. Remove the burner assembly and fan cover as a unit.




Dutch
1995 Coachmen Catalina 322QBXL
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Clay L

Sioux Falls, South Dakota

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Posted: 04/06/10 07:51am Link  |  Print  |  Notify Moderator

As stated above the stuff you want to look at can be removed without taking the unit out.
But if you still want to remove the whole furnace it can be removed leaving the plenum in place. There is a screw on the front in the bottom middle of the unit labeled "Remove for service". Disconnect the propane line, remove that screw and the unit can be slid out. The air delivery hoses and the plenum will stay in the RV.


Clay (WA5NMR), Lee (Wife), Katie & Kelli (cats).

Now snowbirds after eleven years Full Timing in a 2004 Winnebago Sightseer 35N, Workhorse chassis, Honda Accord toad

rvsatek

AZ, USA

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Posted: 04/06/10 08:59am Link  |  Print  |  Notify Moderator

Every service function on your furnace can be done without taking the furnace out. If you have never taken the gas valve,burner assembly out it may take longer than it should but it is easy once you figure it out. the steps above are a good start.


Larry
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Dutch_12078

Great Sacandaga Lake, NY

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Posted: 04/06/10 09:16am Link  |  Print  |  Notify Moderator

rvsatek wrote:

Every service function on your furnace can be done without taking the furnace out. If you have never taken the gas valve,burner assembly out it may take longer than it should but it is easy once you figure it out. the steps above are a good start.

And it's good practice for replacing the fan motor.

Dutch

rtaylor0830

davidsonville md

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Posted: 04/06/10 09:34am Link  |  Print  |  Notify Moderator

clean the flame sensor that is why the gas is immediately shutting down.

99damon

Colorado

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Posted: 04/06/10 07:36pm Link  |  Print  |  Notify Moderator

UPDATE -- OP here. Emboldened by your assurances, I tackled the Atwood. Cleaned up the igniter/sensor, re-gapped it to 1/8 inch, shined up all the contacts, vacuumed out some lint, and I'm good to go, at least for one lengthy test.

One of these days, I'd like to get my eyes on the combustion chamber, but that remains out of view at least for today.

Thanks everyone.

Wayne

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