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Old 08-10-2015, 04:53 PM   #1
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Black tank flush ???

Never had one before, trying to work it out. No instructions in the manual.
I hooked a hose from the house (at home) into the 'black tank flush' port.
I turned the water on only for a few seconds and then I was going to open the black tank valve. But water started spraying everywhere so I shut it down!
1) do I need to use a regulator? is there too much pressure?
2) should I had opened the valve first? It seems like people have done it both
ways? I'm getting mixed signals.
3) maybe a plumbing issue but when it's just hooked up for water, everything
is fine. I had an outside shower installed at the dealer where we bought it
and they screwed up and tapped into the black water flush line instead of
cold water line. (Another story). So I took it to a CW as they had to replace
a cracked skylight under warranty. So I had them work on the shower as
long as it was there.
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Old 08-11-2015, 05:52 AM   #2
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Where is the water spraying from. Sounds like they didn't fix the line when they tapped into it.

I would have the valve open when using. After using it and know it's working right can close to let water build up in the tank but don't wait to long. I haven't used a regulator on my black tank flush. Too much pressure hasn't been a problem where I have been.


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Old 08-11-2015, 06:24 AM   #3
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Quote:
Originally Posted by jas451 View Post
Never had one before, trying to work it out. No instructions in the manual.
I hooked a hose from the house (at home) into the 'black tank flush' port.
I turned the water on only for a few seconds and then I was going to open the black tank valve. But water started spraying everywhere so I shut it down!
1) do I need to use a regulator? is there too much pressure?
2) should I had opened the valve first? It seems like people have done it both
ways? I'm getting mixed signals.
3) maybe a plumbing issue but when it's just hooked up for water, everything
is fine. I had an outside shower installed at the dealer where we bought it
and they screwed up and tapped into the black water flush line instead of
cold water line. (Another story). So I took it to a CW as they had to replace
a cracked skylight under warranty. So I had them work on the shower as
long as it was there.
Is this (Black Tank) in use? You say your at Home and going to Open the (Black Tank Valve)? Is it hooked to a Sewer? Sounds like the (Clowns) who hooked up the (BTF) to your (OSS) could also have placed the (Backflow/Check valve ) backwards! Youroo!!
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Old 08-11-2015, 10:30 AM   #4
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Well, I think it's ok. I did put a regulator on the incoming hose but I also noticed that the
cap that they had used to cap off the line to the OSS was not pressed on all the way.
I pushed on it and it 'clicked' or 'locked'. So I hope that is the end of it. I just find it frustrating that this whole RV industry seems a little lax in the units that they build and put out on the market, and then the support and maintenance responsibility associated with them.
I mean, why can't I get a manual/instructions that is specific to the product that I bought and paid for? I also sent a copy of the bill from CW for the cost to repair the installation screw up by that outfit in Texas for the OSS. Think I'll ever hear anything back? I doubt it!
If you're not handy and don't have some sort of a mechanical aptitude and can do alot of this stuff yourself, you might want to find another hoppy!
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Old 08-11-2015, 01:20 PM   #5
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I was told that if you use the black water flush you have to have the black water dump valve open.or it will build up pressure in the black tank and contaminate the whole water system. Thats what they told me at the dealer. So when I domp my black tank I leave the dump valve open and run the black tank flush and the spickett I use has a lot of pressure .
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Old 08-11-2015, 01:46 PM   #6
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Last fall I used my black tank clean out connection with my drain valve closed. I waited until the black tank was full watching it in the toile to see how full it was. I then dumped it. I do not see how it is possible for the black water to invade the fresh water lines or system. It seems to me that they are totally separate. But maybe I am wrong on this. Anybody else know about this?
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Old 08-11-2015, 02:01 PM   #7
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A BIG sticker on mine says Black Tank Valve Must be Open Before Flushing
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Old 08-11-2015, 02:07 PM   #8
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Hmmmmm nothing like that on mine. And I never read anything in the instructions about it either. Maybe I missed something. I will do a bit of snooping and see what I find.
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Old 08-11-2015, 02:08 PM   #9
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The sticker is in the valve area and black tank flush area . A big one at that
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Old 08-11-2015, 02:13 PM   #10
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If you don't have the black water drain valve fully open when you flush it it will build up enough pressure to burst the plastic back flow preventor. If this happens water from the black tank can seep back into the water lines and contamination will occur. I speak from experience. There was a video I watched a short time ago where a guy was giving an instructional on how to flush a tank. He instructed to fill the tank using the flushing hose. The only way that will work without damaging the back flow preventor is if the toilet valve is cracked open to let air escape! Otherwise you are asking for trouble.
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