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Old 01-11-2011, 11:11 AM   #11
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Pulled the interior access panel again.

Then removed a sheet metal cover on the furnace unit.

This exposed the burner tubes.

I took a bright flashlight and shined it back between the burner tubes and I think I can see a squirrel cage. Tried to thread an old fishing pole back there to turn the cage. IF that was the cage, I couldn't get it to budge. No mouse droppings anywhere.

KRS
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Old 01-11-2011, 11:26 AM   #12
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Here is a Suburban furnace overview that may be of assistance to you...good luck!
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File Type: pdf Suburban Furnace Overview.pdf (804.8 KB, 321 views)
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Old 01-12-2011, 08:51 AM   #13
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Just used a surefire flashlight to look inside the exterior vents.

There appears to be mud dauber nests in them, I can see a bit of squirrel cage and the nest looks like it's attached.

Thought about removing furnace to clean it. There are two screws attaching furnace to trailer. There is a propane connection. Then there is a bunch of wires. The wires have no quick disconnect.....
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Old 01-12-2011, 08:59 AM   #14
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Quote:
Originally Posted by KRS View Post
There appears to be mud dauber nests in them, I can see a bit of squirrel cage and the nest looks like it's attached.

Thought about removing furnace to clean it. There are two screws attaching furnace to trailer. There is a propane connection. Then there is a bunch of wires. The wires have no quick disconnect.....
Yep. Sounds like you're on the right track.
Welcome to RV maintenance 101.
Good luck!!
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Old 01-12-2011, 09:13 AM   #15
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Here's the setup (in the Arizona mountains August '09)


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Old 01-12-2011, 09:43 AM   #16
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unless you can get to the nest thru the tubes from the exterior with a crevice tool pulling the unit is the best.

handle the furnace carefully. i had mine out last fall and discovered out on the road that i had somehow cracked the insulator on the electrode. crack was right where the insulator passed thru the mounting bracket so electrode was shorting out and the furnace wouldn't light. there we were 250 miles from home, 9 o'clock at night and miles from a town in 25 degree weather and there i am tinkering away to rework the electrode to get heat. fortunately, we were using a space heater and only needed the furnace as a back up.


Quote:
Originally Posted by KRS View Post
Just used a surefire flashlight to look inside the exterior vents.

There appears to be mud dauber nests in them, I can see a bit of squirrel cage and the nest looks like it's attached.

Thought about removing furnace to clean it. There are two screws attaching furnace to trailer. There is a propane connection. Then there is a bunch of wires. The wires have no quick disconnect.....
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Old 01-13-2011, 09:36 PM   #17
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It's a Suburban SF-30F.
Pulled it today.
Ruined the dual chrome exterior vent... can't seem to find one...?
Do I use the 'ribbon' style sealant to put the vent back on?

Okay, pulled the furnace.

Removed the screws that hold the black squirrel cage fan shroud on, slid the shroud as far as I could to the side. Broke up the stuff, scraped, blew it out, and cleaned some more.

I think I got it all.

Going to put it back together this weekend.

Need the chrome thing and some sealant(s).

Thank you all for your help,

KRS
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Old 01-14-2011, 08:37 AM   #18
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Great that you found the problem.

Sorry that the outside vent cover got trashed.
You can buy them online from various RV parts places
and your local RV parts counter either has
them or can order. (The photo of a vent that I posted
earlier came from an online parts seller.)

They also sell stainless steel screens that are easy
to attach to your furnace flue and also
the outside vent on your LP water heater.
I have them and so far they have done the job for
me as far as keeping the mud dauber wasps out.

You can use ribbon caulk if you want to.
You can also use "plumbers putty" available at
any hardware store. Don't put on too much.
You don't want it to squish out inside and be a possible
fire hazard at the exhaust opening. I suppose most
any outside caulk could be used under the flu cover
when you're installing the replacement.


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Old 01-15-2011, 09:10 PM   #19
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Tested, finished instal, replace exterior dual-vent, sealed that up.... good to go!

Thanks for the help,

KRS
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Old 01-17-2011, 08:37 AM   #20
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Don't forget your bug screens!!

Furnace Insect Screens to Protect your RV
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