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Old 11-05-2019, 07:18 AM   #1
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Posts: 708
Winterize Class B without Truma Combi bypass

Unless I'm missing something, I don't believe my Coachmen Galleria has a bypass around the Truma Combi water/cabin heater. I've found the hot and cold low point drains as well as the fresh tank drain, and the Truma pressure relief/drain valve, which was nicely buried under some flex duct.

But no sign of a bypass three-way valve, or three two-way valves.

The Truma book says,

"Winterizing the RV with a winterizing fluid is only possible with an installed bypass kit (not in scope of supply), refer to the RV manual."

The Galleria manual says (copied and pasted),

Winterizing the System

1. Empty all tanks and Truma water heater (flip up the yellow valve located under the kitchen base to drain), air can be used to clean out lines.

2. Open low point drains (located underneath the unit behind the termination panel) and fresh tank drain (located on bottom side of fresh tank).

3. After tanks and Truma are drained, close fresh tank drain, low point drains and the yellow Truma valve on the inside of unit.

4. Attach hose to water fitting on the termination panel and put other end into a bottle of RV antifreeze to be drawn into the water lines.

5. Turn water valve on termination panel to the 3 o’clock position (winterize).

6. Go inside unit and open kitchen sink faucet, turn on the water pump located in the front door on the kitchen overhead.

7. Let the faucet run until the antifreeze comes out, shut the faucet off and go to the next fitting that releases water. Repeat process on the toilet, shower faucet and finally the outside shower faucet.

I believe the Trumi holds something like 2-1/2 gallons of water, so if it fills completely before the hot water lines get antifreeze, then I guess that's all I can do.

I need to be able to do this on the road, as we'll be in warm country and return to (almost certainly) cold country, followed by another trip in Feb. which means leaving in freezing weather and returning to such.

The plumbing is visible underneath the van, so it'll have to be drained at the very least, and the water pushed out with antifreeze at best. I have a length of hose to connect to the inlet, which I'll bring with me.

Other than adding bypass valve(s), which won't be easy under that galley cabinet, is there something I'm missing here? Or should I just plan on using 3 or 4 gallons of pink stuff? Or just draining the low points and hoping for the best?

Already had the pics, mostly so I could see where things were using the camera stuck into tight places, so I posted them. Three of four are upside down (second one is correct) and I don't know why.
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Tom & Jeri
2018 Coachmen Galleria 24T Li3
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Old 11-06-2019, 07:07 AM   #2
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No takers, huh?

Probably not a lot of Galleria owners with this issue, I'm guessing. Maybe I should have posted it in the Forest River section, but there's not a lot of traffic in the Coachmen area either.
Tom & Jeri
2018 Coachmen Galleria 24T Li3
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class b, winter, winterize

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