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Old 02-13-2017, 12:23 AM   #71
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I read somewhere about a guy who spent a small fortune installing a pair of iPhone-controlled articulated recliner lounges in his van instead of beds. Turns out that not a single major RV upfitter does this. He must be feeling pretty foolish right now.
Yep and many people have followed with the same design at Advanced RV.

Well one upfitter has gotten close and figured out how to manually prop the back of a twin bed.
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Old 02-14-2017, 04:00 AM   #72
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Historically RVs had single waste tanks. Separating black from grey is a more recent refined development and you find one converter out of all that either is not with it in how people use Bs, is looking for a cut corner cheap solution or hasn't been in the market all that long. Who really knows? Are you even sure it is a single tank? Brochure information is not always clear or accurate. I think Avanti alluded to his first Airstream having a single tank? I know my vintage Airstream trailer had a single tank but Airstream no longer does that. They evidently learned. Airstream, Roadtrek, Winnebago, Pleasure-way, Leisure Travel Vans, Advanced RV and all disagree. Those in the business have all gravitated to the two tank system and it was not driven by customers but from their own common sense practical space matters working out the details. That's a lot of overwhelming agreement.
To answer your question, there is no question that the Avion Azur B uses a single waste tank. You can take that to the bank. Their Class B volume I am guessing is somewhere between ARV and LTV and after three years if their single tank approach produced the draconian consequences suggested on this thread, I doubt that they would still retain the design.

Avion has been in the trailer business quite a while and this is their first and only Class B product which they have been producing for around three years. Their trailer history doesn't guarantee success in Class B design, (the warts reported in Airstream's B demonstrates this), but they are certainly no strangers to waste tanks and were fully aware of the conventional two tank approach when they decided to implement a single tank.

So, the good news is that unlike some discussions that never leave the theoretical, at least there is a real world case where a single waste tank is being supplied in a Sprinter B and history will eventually demonstrate whether the owners love it or hate it or more likely, IMO, just accept and adjust to it.
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Old 02-14-2017, 04:55 PM   #73
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To answer your question, there is no question that the Avion Azur B uses a single waste tank. You can take that to the bank.
I asked them and they answered:

"We use a combined gray and black tank to save space the macerating toilet does a great job. "
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Old 02-14-2017, 09:09 PM   #74
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I asked them and they answered:

"We use a combined gray and black tank to save space the macerating toilet does a great job. "
I'm shooting from the hip here, but I think the combination tank is probably not located directly under the toilet and the macerator produces a slurry that will move to the tank with less plumbing pitch than solids require.

Regardless of the tank(s) array, strictly from a functional viewpoint, I think the macerator is better placed at the toilet than at the outboard end. However, that said, there may be some ugly consequences if the toilet macerator fails. Even if there is a provision to bypass it and dump directly, will the plumbing design permit the transit of solids rather than slurry from the toilet into the tank? Presumably, a builder designs for worst case scenarios but history demonstrates that sometimes this assumption is ....optimistic?
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Old 02-14-2017, 09:29 PM   #75
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.

I think I will stop now.


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Old 02-14-2017, 09:54 PM   #76
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.

I think I will stop now.


Say it isn't so! Such a crying shame considering how far we've traversed.... into the mystery.
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Old 02-14-2017, 10:01 PM   #77
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I can see the advantage of having a macerator at the toilet. But it is really serving a different function then a pump-out macerator. The biggest reason I am committed to the latter is that it permits a totally sealed system that never gets gross. They are really separate issues.
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Old 02-15-2017, 12:17 AM   #78
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I can see the advantage of having a macerator at the toilet. But it is really serving a different function then a pump-out macerator. The biggest reason I am committed to the latter is that it permits a totally sealed system that never gets gross. They are really separate issues.
Is there anything that precludes employing a macerator at both points?
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Old 02-15-2017, 12:26 AM   #79
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I can see the advantage of having a macerator at the toilet. But it is really serving a different function then a pump-out macerator. The biggest reason I am committed to the latter is that it permits a totally sealed system that never gets gross. They are really separate issues.
avanti, so you macerate your stuff into the gray water, now time for dumping. When does the bad stuff go to the bottom you talked about. How long do you have to wait?

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Old 02-15-2017, 01:21 AM   #80
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avanti, so you macerate your stuff into the gray water, now time for dumping. When does the bad stuff go to the bottom you talked about. How long do you have to wait?

Bud
Agree. My description of that phenomenon did not assume a toilet-side macerator. If you have one, you need to select a design that does not assume this. There are many choices.


@cruising: No, there is no reason you can't have two macerators.
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