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Old 06-04-2016, 02:55 PM   #1
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Join Date: May 2016
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Black Tank Flush

Thank you for acceptance into the forum. We sold our nice teardrop camper and opted for more room and comfort.
However, there are a few features that are puzzling to us and I am hoping you can help. This forum is a bit more complicated with the sub-models categories, so please bear with me.
We have a 2016 Coachmen Freedom Express 192RBS.
We are new to black tank flush and after having used 1 time, I think it is beneficial. Our manual doesn't exactly cover the details.
1. Do you back flush while dumping the black water tank or after the tank is emptied?
2. Domestic roof air NOT ducted: I am one who is sensitive to light and noise while sleeping. The Dometic manual is somewhat generic and I assume the A/C fan runs constantly while the compressor cuts on/off. I now wish we had bought the Micro Lite that had ducted heat/air. I am missing something?
I have spent quite a while searching your forum files.
Thank you.

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Old 06-04-2016, 03:47 PM   #2
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Location: Wisconsin
Posts: 8,140
1. Use the black tank flush while emptying the black tank until clear water runs out. How do you know the water is clear? Get one of these: 3" Valve Hose Adapter - Valterra T1026-1 - Sewer Fittings & Adapters - Camping World. Then close the gate valve and let the black tank flush put it 3-5 gallons of water.

2.You are correct, fan while run and compressor cycles on/off as needed.

2013 Palomino Sabre 34REQS-6

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Old 06-04-2016, 07:27 PM   #3
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Posts: 128
Depending on the model of your AC unit there are control modules available to convert it so the fan does not run all the time and it adds a wall mounted thermostat. Easy to install, it was the first thing we did to our Clipper since neither of us like the full time fan. And the control module also gives you high and low speed fan settings.
John & Mary Jo
Enjoying the adventure
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Old 06-07-2016, 12:52 PM   #4
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Posts: 534
How I flush my black tanks depends on whether it's a final clean out at the end of a trip or just a mid-trip empty. If I'm in the middle of a trip and just emptying it because it's full, I'll run the rinse while it empties and leave it on until the water runs clear.

If it's my final empty at the end of a trip, I'll empty the tank, close the gate valve and use the black tank rinse to fill the tank with water. Once full, I'll empty it again. I'll repeat this process until the water runs clean. Sometimes It takes 2 or 3 fills before it's clean. I will then dump my grey tank to rinse out the sewer hose. Again, I only do this extra rinsing if I'm done with the toilet until the next trip.

2016 Coachmen Freedom Express Liberty Edition 310BHDS
2015 Toyota Tundra 5.7L V8 with towing package
Husky weight distribution hitch with sway control
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Old 06-07-2016, 06:50 PM   #5
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Posts: 92
Black Tank Flush

I too found the owners manual vague in directions doing this. After some searching I found that using the flush while dumping is a practice many do however when you close your black tank valve to flush with water you must be make sure not to overfill your black tank (bad news). Relying on your meter is not always good since false readings can occur. One way some gauge the fullness of black tank beyond the meter is to physically look in toilet.

With this said I usually have my DW stand guard watching lights on bt until 2/3 full then dump again and repeat until clear. In my short experience I have yet not seen more debris exit after one flush as it usually takes 2-3 times if not more to dump fill dump flush fill and repeat
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