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10-03-2016, 07:24 PM
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#1
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Senior Member
Join Date: Sep 2004
Posts: 1,841
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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?
__________________
2022 New Aire 3545
Huey Pilot — Vietnam 1971-72
Author of: ACE, The Story of Lt. Col. Ace Cozzalio
and: The Aviators: Stories of Helicopter Combat in Vietnam 1971-72
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10-03-2016, 07:40 PM
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#2
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Senior Member
Newmar Owners Club
Join Date: Jan 2015
Posts: 358
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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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Ron & Mary
2019 Newmar London Aire 4543
2014 Honda CR-V
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10-03-2016, 09:43 PM
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#3
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Senior Member
Country Coach Owners Club Newmar Owners Club Freightliner Owners Club
Join Date: Apr 2013
Location: Portland
Posts: 278
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Quote:
Originally Posted by WYRon
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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ditto
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2015 Newmar Dutch Star 4366 pulling a 2014 Dodge Ram Truck
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10-03-2016, 11:10 PM
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#4
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Senior Member
Freightliner Owners Club
Join Date: Oct 2002
Location: Fairview TX
Posts: 2,463
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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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Slabman
2019 Newmar Ventana 3717
2007 Lexus LX470 Toad
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10-04-2016, 03:41 AM
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#5
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Senior Member
Join Date: Nov 2014
Posts: 2,515
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How do you go about reducing the amount of water?
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10-04-2016, 05:45 AM
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#6
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Senior Member
Newmar Owners Club
Join Date: Apr 2016
Location: Carefree, AZ
Posts: 620
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Quote:
Originally Posted by Canuck53
How do you go about reducing the amount of water?
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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"
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Juergen & Margit
2016 Newmar DS 4018
2016 Jeep GC Limited
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10-04-2016, 03:28 PM
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#7
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Senior Member
Newmar Owners Club
Join Date: May 2015
Posts: 315
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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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10-04-2016, 04:06 PM
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#8
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Senior Member
Join Date: Nov 2007
Location: Charleston, WV
Posts: 3,469
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If it's yellow, let it mellow. If it's brown, flush it down.
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John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
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10-04-2016, 04:33 PM
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#9
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Senior Member
Join Date: Jan 2016
Location: Acworth Ga
Posts: 176
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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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2016 Dutch Star 4369
2015 Jeep Wrangler JK
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10-05-2016, 09:20 PM
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#10
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Mar 2011
Location: Fort Myers, FL
Posts: 1,670
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Quote:
Originally Posted by Carefree
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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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??
Steve
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Steve & Lisa
2022 Mountain Aire 4118
2024 JL Rubicon & 2019 Cherokee Trailhawk
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10-05-2016, 10:53 PM
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#11
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Senior Member
Freightliner Owners Club
Join Date: Oct 2002
Location: Fairview TX
Posts: 2,463
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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.....
__________________
Slabman
2019 Newmar Ventana 3717
2007 Lexus LX470 Toad
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