Propane LP detector and furnace problem

[guysing]

Welp, heres how it went.
I instlaled the new gasket and sealed it with 700 degree silicone but still had the problem. By the way, the silicone held up like a champ. I got it from Advanced Auto, the "Copper" high temp silicone.

I completely removed the furnace from the TT but found no obvious problems where any LP might be leaking from.

Reinstalled the furnace and to make a long story short, and after doing everything I could think of, I came to a conclusion.

Even after disconnecting the LP lines from the tanks and the furnace, and burning off what gas was left in the stove line, my hand held detector still went off when the furnace blower came on and forced air into it! Thats right, with no gas being sent to the furnace the air from it sets off the detector.

I have no idea. Am I to assume that there is some sort of "residue" in my furnace from burned LP gas that sets off my detector? i know this makes no sense trust me. Has anyone ever heard of "bad" LP gas? Is this possible?

How about Surburban, the company that makes these furnaces (model NT30-SP), does anyone know what their website is? I am going to use my contact at the RV place however if I could chat with them myself I might save myself a little time.

[Bama Rambler]

Bummer! Here's the website for Suburban RV Appliances http://www.rvcomfort.com/suburban/suburban.php Hopefully they can help you.

One more thought. Was the RTV completely cured when you was testing the furnace. That stuff puts off some strange fumes during curing. If it wasn't completely cured (72 hours +) I'd retest it again after a few heat cycles.

[rthrbelsewhere]

Also, should anyone need a parts list for their Atwood or Suburban furnace, I found this handy dandy little website that may help out.

http://www.aaarv.net/furncae_parts.htm

I'd make a print out for your records and hang onto it since I don't know how long this is going to be up on their website.

Joe

[turbopuppy]

There is evidence that "new car smell" will cause false alarms. It is worth considering the RTV type sealant has solvents that will make your detector go off. Let the trailer air out while the silicone sealant cures. Maybe it was just residual vapors.

[cfsoistman]

Since you had no propane going to the furnace, it's possible that the residual propane from an initial leak may have still been present, trapped, in the blower area and once turned on it blew into your tester. Propane is heavier than air and will drop to the lowest area. The leak detectors are mounted low to detect the propane. This link can explain it much better.

http://www.motorhomeadvice.com/artic...ge=answer&id=9

Have you tried testing it again? Maybe what was left is now gone and the RTV has had more time to cure. If it's clear then try it with the propane on.