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Old 10-03-2016, 07:24 PM   #1
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Dometic 8700 Macerator Toilet Operation

We have a 2017 Dutch Star 4369 with the Dometic 8700 macerater toilet. I have read previous posts about the Hi/Lo dip switch setting and the toilet bowl Full Flush/Short Flush.

This is our first experience with a macerator toilet and find we are dumping the black tank twice as often as our previous SOB motor home with a Dometic non-macerator toilet.

Question: How do you operate your 8700 toilet? Do you use the Full Flush or Short Flush OR, do you swap between the two modes? And, if you modified the Hi/Lo dip switch setting, did it make a significant difference?
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Old 10-03-2016, 07:40 PM   #2
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Not to be indelicate, but we set one toilet for low water, and the other for high water flow when dry camping. We use one for 1 and the other for 2.
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Old 10-03-2016, 09:43 PM   #3
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Quote:
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Not to be indelicate, but we set one toilet for low water, and the other for high water flow when dry camping. We use one for 1 and the other for 2.
ditto
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Old 10-03-2016, 11:10 PM   #4
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Absolutely there is a difference....BIG difference. I have mine screwed down to .3 GPF, but some of that is due to changing my Manablock valves, which I don't think you have. But, from memory, I think you can reduce that stock 1.2 gpf some 40%. But you can do a flow test yourself and determine the consumption with each setting.

I had the same experience as you when I bought my coach...I was astounded! I couldn't believe they would install such a water guzzler and not increase black tank size. They then increased tank size on the upper end models, but the Dutch Star and below didn't get an increase....WHY?
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Old 10-04-2016, 03:41 AM   #5
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How do you go about reducing the amount of water?
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Old 10-04-2016, 05:45 AM   #6
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How do you go about reducing the amount of water?
On my 2016 DSDP I hold the flush button until the power button flashes (I think it is 5 sec.). That way you can switch between the high flow and "economy flush"
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Old 10-04-2016, 03:28 PM   #7
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low on both

We keep both ours on the low setting and just flush several times when solids need to go down. We consistently can go 5 or 6 days between dumping the black tank which works fine for us.
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Old 10-04-2016, 04:06 PM   #8
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If it's yellow, let it mellow. If it's brown, flush it down.
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Old 10-04-2016, 04:33 PM   #9
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Hold the flush button until the light flashes to change flush modes. When dry camping I use low water mode. Turning the water pump off before flushing #1will save more water and black tank capacity. We regularly dry camp 5-6 days before filling the black tank
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Old 10-05-2016, 09:20 PM   #10
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On my 2016 DSDP I hold the flush button until the power button flashes (I think it is 5 sec.). That way you can switch between the high flow and "economy flush"
Other than this "5 second procedure" ... is there any other way to adjust the water level. I think I remember someone saying that there was something that could be adjusted behind the peg board in the under bay below the half-bath??

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Old 10-05-2016, 10:53 PM   #11
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Steve, there is a "brain" box for the toilet on an approx. 6 ft. Cable, so it has to be located within that range of the toilet. So on yours, I'm thinking that cable is routed through the floor alongside the sewer line, then runs rearward between the ceiling plastic and bottom of floor joists. I can actually see the trace on mine...it goes through the bulkhead to just behind my TV or pegboard, if one has that. With a TV/ radio setup, you should be able to get your hands on it through a radio or speaker cutout.

Inside that box, there are some dip switches...can't remember exactly, but seem to remember you need to set the one to " Lowbowl". If you do, then I seem to remember you don't want to mess with the hi/low setting on the flush pad. But I think you have a Manablock, so try progressively closing off the feed to one toilet you use most often.

Here's what I did....empty the black tank and rinse well. Go inside and flush 10 times then go out and dump this water out into a bucket with gallon markings on the side. After recording your results, make a chenge to the Manablock, black box or at the flush pad and do another 10 flushes and measure. You'll find you can set it to consume from about 1.3 down to about .3 gpf, depending on how many setting changes you want to mess with.

BTW...Didn't increase your black tank to 65 gallons on that '15? Or maybe that happened on the '16 models.....
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