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Old 06-04-2016, 09:25 AM   #1
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2016 Chaparral black tank flush

Sorry I will post pics later. It's a Chaparral Lite 29 MKS
Took our Chappy out on it's first true trip. We love the trailer!
We emptied the black tank and then the grays (One must be the kitchen and the other is the shower?). After they drained out, I went to flush the black tank.
There are two water inlets: City water on the right and the flush on the left. I was on the left. I turned on the water and it wasn't going into the system. I called the dealer and no help ("Not familiar with that model"). I sent an email to Coachman and I should have an answer next week (timing). I didn't want to start turning the valves on the panel and potentially contaminate the fresh tank. The black tank flush is a standard option on these units. Any suggestions?
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Old 06-04-2016, 09:37 AM   #2
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Mine looks like this.



Check the check valve in the flush connection, it may be stuck.

Look behind the screen cone.
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Old 06-04-2016, 09:51 AM   #3
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Quote:
Originally Posted by MurphyIRE View Post
We emptied the black tank and then the grays (One must be the kitchen and the other is the shower?).
Yes.

After they drained out, I went to flush the black tank.
There are two water inlets: City water on the right and the flush on the left. I was on the left. I turned on the water and it wasn't going into the system. I didn't want to start turning the valves on the panel and potentially contaminate the fresh tank.
Will not contaminate anything by turning the valves (between city/fill/use). Totally separate water inlets and systems.

The black tank flush is a standard option on these units. Any suggestions?
Check for blockage in the line where it enters the coach. Typically a check valve is put inside a bathroom vanity cabinet. You will see a couple of lines right next to each other that run up the drain pipe. These are not feeds to your sink, but the line to the black tank. A check valve (anti siphon valve) will connect the two at the top (sometimes hidden until you crawl into the cabinet). It could be stuck. Remove and clean and check as best you can.

Those are the easiest to check. If you cannot get it to work, probably warranty time.
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Old 06-04-2016, 10:07 AM   #4
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Thanks! Of course, I have a completely different panel.
I will check out your suggestions tomorrow.
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Old 06-04-2016, 12:59 PM   #5
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When the plastic factory check valve fails, and it will, remove it and 15' of extra hose and install a house type backflow valve found at HD or Lowes......
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Old 06-04-2016, 03:31 PM   #6
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Bob you make it sound so easy
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Old 06-04-2016, 04:25 PM   #7
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Could be that the factory check valve was installed backward......Mine had just started to weep, so I did what OC had done......the brass valve was necked down to existing hose size and now forgotten...
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Old 06-05-2016, 02:08 PM   #8
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My phone died and I couldn't take the picture of the panel.

Here is the outside (Sorry i can't get it to rotate.
Is the one on the left for flushing or is it the 1/2 thread stub on the top of the panel and then I need to make an adapter for the hose connection? [ATTACH]110209
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Old 06-05-2016, 04:42 PM   #9
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If you look at the IMG I posed above you will note a white hose/tube.

That is my Antifreeze pickup, it connects to a about a 1/2 - 3/4 inch connection.

Black water flush should be the same size as a regular water hose.
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Old 06-05-2016, 04:53 PM   #10
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"Black water flush should be the same size as a regular water hose"
What size is regular water hose?
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