Trillium furnace - Fiberglass RV


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Old 08-29-2015, 09:55 PM   #1
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Trillium furnace

Someone, I think David, mentioned the usual fault with the Trillium furnace is the sail switch.
We are a few days from a trip to Jasper and I realized I have never gotten the furnace going. So a couple questions:
1)how do you get it out? I had a couple quick tries and nothing would budge.
2) is it a sticky sail switch or slow fan or obstruction that is the issue?
3)my furnace is under the curb side settee and I have built a queen bed over it. I have no experience with this furnace so have no idea how well it might distribute warm air considering that air has to come out from under the bed. I could easily fabricate a channel with a fan in it. Any thoughts would be appreciated.


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Old 08-30-2015, 03:16 PM   #2
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Well I have it out and the sail switch works well.
It does not maintain the pilot light. This is an older unit (Duo Therm 66012-005) and is pre thermocouple. Instead it has a Bourdon tube heated by the pilot light which activates the gas valve. I removed the end at the gas regulator and if I manually light the pilot light, the gas valve end does not expand as I think it should. Anybody know of a source for these?


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Old 08-30-2015, 03:34 PM   #3
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Ah Ha, new revelation!
It is a thermocouple not a Bourdon tube. I put a milliVolt meter across it and it went up to 20mV when the pilot light was manually lit.


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Old 08-30-2015, 04:24 PM   #4
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Google ' DSI Service Guide ' , may be helpful.
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Old 08-30-2015, 04:42 PM   #5
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If you have pilot light your half way there.
Now, take everything apart and clean it!
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Old 08-30-2015, 10:20 PM   #6
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So I have it working, but it is a very strange system.
Everything works except the thermocouple was mounted below the pilot light???
Even after the pilot flame had been on for 5 minutes, the tip of the thermocouple was cool to touch. If the furnace were to be inverted 180 degrees it would work perfectly. The following picture is after the fix.
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Now the thin copper tube (the thermocouple), is above the larger silver tube (the pilot gas tube). I couldn't flip the entire furnace but I drilled 2 new holes in the little manifold and flipped it.
My best guess is that there were 2 styles of manifold available depending on how you wanted to mount your furnace and my furnace had the wrong one.


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Old 08-31-2015, 12:49 AM   #7
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Hey Bob thanks for the DSI link. Unfortunately mine is pre DSI. In fact I think it's prehistoric.


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Old 08-31-2015, 01:39 PM   #8
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Doug,

Your furnace is not like anything I have seen in a Trillium before. Could you post overall pictures of it?

Is it a forced air furnace? A sail switch implies a fan.

The standard Duo-Therm. Furnace for a 1300 would be like this, but without the blower:
Trillium Furnaces - 9-3608 Blower
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Old 08-31-2015, 02:03 PM   #9
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Trillium furnace

Hey David
It is forced air but different from the your link.
Click image for larger version

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The 2 fans run coaxial from one motor.
It seems to run very well now, but it is so strange that it was mounted with the thermocouple below the pilot flame. I don't think it has ever run since installation, as I don't see how the thermocouple could ever be heated enough to latch the pilot valve, and the main gas valve would not go on without the pilot valve latched.
I would love to see a picture of the pilot manifold from an other unit.
I spent a number of hours yesterday contemplating if Duo-Therm had done something very clever that I was missing, or if it was simply installed with a special upside down version manifold. All the printing was right side up.
I suspect mine is odd because it is under the curb side settee.


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Old 08-31-2015, 02:47 PM   #10
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To me, it looks like it is installed sideways.

I am calling this a PO install.
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