Skip to main content ↑ ↓
Topic: Macerator toilet system to replace entire vacuflush system (Read 15398 times) previous topic - next topic

Re: Macerator toilet system to replace entire vacuflush system

Reply #40 –
Control box installed in hamper behind toilet:

Re: Macerator toilet system to replace entire vacuflush system

Reply #41 –

The 1.5 inch sanitation hose goes on some fittings easily, and some fittings with extreme difficulty. Dometic says to use dish soap --that works only on the easy fittings.  A hair dryer and heating the end of the hose, then adding the dish soap makes it easier.

One unexpected issue:  The vacuflush discharge hose connection is at floor level, and centered on the old toilet.  The flushmaster discharge is up quite a few inches, and on right side of toilet as viewed from the front.

Santiation hose is not very flexible at all, especially short sections. I had to mount the new toilet offset to the left compared to old toilet.  Note in pic 2 the old mount holes on right side compared to new. Required a 90 degree 1.5 inch fitting, plus 2 sections of sanitation hose even with the offset mounting.

For the 90 degree hose fitting, I ordered a inexpensive Amazon product. It worked, but I am surprised it is not seeping. I'm going to buy a different one to have on hand "just in case" as this size hose fitting is not in all hardware stores.

Not expensive, may or may not be better: https://www.homedepot.com/p/Apollo-1-1-2-in-Barb-Insert-Blue-Twister-Polypropylene-90-Degree-Elbow-Fitting-ABTE112/300814157#overlay

 https://www.supplyhouse.com/Everflow-PXLN0112-NL-1-1-2-PEX-x-1-1-2-PEX-Brass-Elbow-Lead-Free
Says for pex only, not sure of the weight on the toilet connections

Others that may or may not work:
Amazon.com: Universal Aluminum Radiator Hose Connector | 90 Degree Elbow |...
Amazon.com: Yoebor Stainless Steel 304 Sanitary Hose Barb 90 Degree Elbow...


As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

Re: Macerator toilet system to replace entire vacuflush system

Reply #42 –
Quote from: steve –
Looking good ... thanks for all the pictures and updates!

When you pull the old toilet (in case you never have), the zip ties in the floor mounting holes were OEM.  They were there when I removed the toilet to change the lower seal and one of the linkages.  In fact I may have added a couple of more to get the base to cinch down, no one wants a wobbly base :D
I had to add zip ties into the 2 new holes for new toilet to get solid connection.

Re: Macerator toilet system to replace entire vacuflush system

Reply #43 –
Interesting that the outlet is not centered, good to know.  Wish they would list the min bend radii for the sanitation hose instead of just saying "flexible". 

Glad to know the zip ties remain :D

Re: Macerator toilet system to replace entire vacuflush system

Reply #44 –
In the basement.

Before/after Vac generator gone.  New plumbing above the black and grey tanks.

On the right side, the new 180 degree return from toilet to black tank is braced top and bottom so it can't bounce or shift around.

On the left side, the drop into the black tank has a piece of yellow foam jammed above it so it can't shift upward out of the tank.



Re: Macerator toilet system to replace entire vacuflush system

Reply #45 –
New system is much quieter than the old toilet/vac generator.

Much less complex as will, with less to go wrong. Parts readily available, and if professional service needed more RV techs familiar with the masterflush/macerator toilets.

We are happy we did the change. 

Re: Macerator toilet system to replace entire vacuflush system

Reply #46 –
I would do the same as what you did if I had your design but we have the "plop & drop system.

Re: Macerator toilet system to replace entire vacuflush system

Reply #47 –
"Plop and drop" beats complex systems.

Re: Macerator toilet system to replace entire vacuflush system

Reply #48 –
Quote from: AC7880 –
New system is much quieter than the old toilet/vac generator.
Admit  it ... you are going to miss the Ka-chunka-Ka-chunka-Ka-chunka

Congrats on getting the job done, that was a lot of work!

Re: Macerator toilet system to replace entire vacuflush system

Reply #49 –
The flushmaster is designed to add water by lifting the handle, and flush by pushing down.  It was doing just the opposite.

Red wire is flush, black add water, white ground. 

First pic is flush handle wiring before I swapped black and red wires, tightened the wire tie for the wires to stay connected, and improved the strain relief wire tie. 

2nd pic is toilet flush handle now working as it should be.  If you order a master flush check the wire locations before installing (I had to pull the toilet to fix it).

Links to parts photos:
Dometic/Sealand | 8700 Series Flush Handle Assembly | 385311704 - Environment...
Dometic/Sealand | Flush Handle Rocker Switch | 385311290 - Environmental Marine

Re: Macerator toilet system to replace entire vacuflush system

Reply #50 –
Quote from: AC7880 –
One function we will lose is full tank toilet shut down system.

The vacuflush has a full tank sensor that stops the toilet from flushing.  In seven years plus, we have only hit that full tank shutoff 2 to 3 times when boondocking or in parks with electric and water but no sewer drop.

Dometic sells a optional full tank sensor system for the Master Flush macerator. We will not get it. No access to top of tank to add it to black tank, hassle running wiring, and some people have had issues with false system shutdown and clipped the wires.

I had added See Level Garnet tank `monitoring in the past, one display in basement by dump valves, one inside coach.

  I will replace one of the two monitors with blue tooth capable Garnet BTP-709. Same size display, just some wiring change right at monitor, so easy change.  Introducing the All-New 709-BTP7 – Garnet Instruments

BTP-709: Available for both iOS and Android devices, the app enables users to access real-time tank levels, set customizable alerts for when tanks are too high. 

We only use  fresh, grey, black, and battery functions. We will just ignore the alt and water pump switch on the new monitor. We will set alerts via blue tooth app for fresh, black and grey tank levels. 

Existing monitor to replace:

Update on the BTP-709 bluetooth seelevel tank monitor/display
It works great to see tank levels anywhere in or near the coach and to send notifications to the cell phone at specific user selected low/high tank levels.

As a one and only monitor it works great. If you currently have 2 tank displays (I have one inside and one in sewer bay by dump valves) it creates a issue.

The bluetooth one polls the tanks continuously, one after the other.  As it polls the tanks, the legacy display montor will err and/opn as that specific tank you push the button for is polled.

Solution one: on the legacy display keep hitting the button for that tank until not being polled - it will display normally.
Solution two: ignore the legacy display and just use the cell phone app.

If installing seelevel tank monitoring from scratch, only one display is needed, mounted either inside or outside. Just get the bluetooth monitor solution and use cell phone app from anywhere in/near the coach.

Re: Macerator toilet system to replace entire vacuflush system

Reply #51 –
Last step. Wallplates.com product. Covers holes from fan control and vacuflush display.