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Old 04-30-2018, 02:56 PM   #11
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Quote:
Originally Posted by booster View Post
Truma Combi installations instructions:

http://https://www.truma.com/web/dow...tion-us-en.pdf

They show with and without bypass plumbing with relief valve to the unit side of all valves, but don't specifically address saying no valves allowed, in the instructions. They do specifically state that the relief valve is required.
Bad URL, this one works...

https://www.truma.com/web/downloadce...tion-us-en.pdf
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Old 04-30-2018, 03:02 PM   #12
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Originally Posted by GeorgeRa View Post
I am struggling in understanding the picture, the output from the pressure relief valve goes into the wood enclosure holding a valve, is this valve blocking the relief. If yes would this be a 3-way valve?, why?

You have a nice pictures but a simple plumbing diagram would be better to convey a technical message, at least for me.
The photo showing the actual plumbing is hard to follow, that's why we created to attached drawing (fig 2 on the webpage).

The photo of the actual plumbing includes a box that contains a double decker of unrelated plumbing. The top plumbing is a tee valve that switches the pump's input to Winterize to suck in antifreeze; they are not part of the violation so they aren't shown in figure 2. The bottom plumbing is a simple tee that adds the overpressure safety valve to the plumbing headed to the bypass valve that disables the safety valve.
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File Type: jpg Hazardous relief valve rev 4.jpg (110.2 KB, 19 views)
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Old 04-30-2018, 03:18 PM   #13
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Originally Posted by gregmchugh View Post
Thanks for the post. I agree. National Fire Protection Association code 1192 7.3.11.1 is clear that a pressure valve is required and Hymer's bypass valve defeats that required function. The code doesn't allow electronics in the heater to replace the pressure valve. The pressure relief safety valve releases the steam/water safety to the ground. The electronics MAY shut the gas and electric heater off and the pressure MAY return to safe levels in hours. The electronics do not immediately release the pressure to the ground. Will an RV owner try to fix his heater that just stopped working and get sprayed with scalding water?

The RVIA doesn't have the power to wave the total intent of the NFPA code and then represent the RV as compliant and safe.
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Old 04-30-2018, 03:18 PM   #14
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I assume this is the “relief” valve flow diagram by Roadtrek. Truma’s manual clearly shows how a pressure relief valve should be installed so why would they approve a different and unsafe installation.
A first boom-boom malfunction and Roadtrek could be in a deep trouble and will not be able to say we didn’t know.
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Old 04-30-2018, 05:03 PM   #15
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Originally Posted by GeorgeRa View Post
I assume this is the “relief” valve flow diagram by Roadtrek. Truma’s manual clearly shows how a pressure relief valve should be installed so why would they approve a different and unsafe installation.
A first boom-boom malfunction and Roadtrek could be in a deep trouble and will not be able to say we didn’t know.
Let's fix it before equipment is damaged or people injured. BTW: this is hymer aktiv. Roadtrek is now just a market name for some Hymer's. The truma Combi is a great product so they may soon be on Roadtrek.
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Old 04-30-2018, 07:05 PM   #16
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Originally Posted by BBQ View Post
.

He is BS'ing again.

RVIA is NOT a regulatory authority.

RVIA is a voluntary industry trade association.
It has no legal authority whatsoever.
ie. the boss is asking the little boys club to review itself.
No bad thing is going to come out of it.
I bet you no study has been done by them. It is only a rubber stamp.
If they have done any real review, JH would have published their formal report instead of doing this song and dance.

I agree. Rvia has no regulatory authority and that may be the root of the problem. Road Trek: the group is a choreographed cheering leading group. No freedom of speech. I miss the owner's great comments and pictures.
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Old 04-30-2018, 07:13 PM   #17
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WGO installs a PRV on the Travato per Truma's instructions. They don't do it without being required to obviously.
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File Type: jpg travato PRV.jpg (52.2 KB, 24 views)
File Type: jpg travato prv2.jpg (94.3 KB, 37 views)
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Old 04-30-2018, 08:03 PM   #18
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I have the Isotemp marine style water heater with the 100PSI safety valve attached at the factory, it is also used to drain.

Webasto Dual Top has pressure relief valve.

Hot water heaters have been installed in RVs for years, it would be nice to know what the reasoning process was to constrain safety valve outlet.
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File Type: jpg press rel.jpg (126.4 KB, 12 views)
File Type: jpg 123.jpg (94.6 KB, 11 views)
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Old 04-30-2018, 08:06 PM   #19
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WGO installs a PRV on the Travato per Truma's instructions. They don't do it without being required to obviously.
Yes, I look at a travato and their plumbing was correct and clever.
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Old 04-30-2018, 08:22 PM   #20
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I guess it will be telling if they make a running change on Aktivs at some point. I'm sure JH is looking at the cost to recall on all they've built so far to change it. It would cost hundreds $ per van to fix $.25 worth of T and tubing.
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