Re: Installing Vacu-flush
If I read this correctly, you are talking about the the overboard discharge pump.
In my set-up, I used a Sealand T series pump. I plumbed from the holding tank to a thru-hull previously used as overboard discharge for the old head system. I did not use a vented loop. I have had no problems, but I only open that thru-hull when I am actually going to pump the holding tank overboard. The rest of the time I keep it closed.
Since the bowl uses fresh water and the system needs to build vacuum, there obviously wouldn't be one in the system prior to the holding tank.
Re: Installing Vacu-flush
Quote:
Originally Posted by
hattitude
If I read this correctly, you are talking about the the overboard discharge pump.
Indeed - that is what I meant by holding tank evacuation pump.
Thanks - Murray
Re: Installing Vacu-flush
I installed a VF in my Krogen and followed the installations instructions and there was no mention of a vented loop. My present system on my Hat has none either. Ron
Re: Installing Vacu-flush
A vented loop is required when the discharge end is underwater....like in the discharge line from a toilet overboard...if the overboard discharge is at the water line, no real need for a vented loop...
Re: Installing Vacu-flush
i have a vented loop between the Sealand overboard discharge and the thru hull but i dont' think it's needed.
although i wonder if water could make it back past the bellows and duckbills of the pump, especailly since the T series pump only has one pair of DB, vs the two pairs on the standard vac pump.
it's good practice to close the seacock anyway, as long as it's accessible... and if you dont' have a key switch on the overboard pump, it must be closed to be legal.
now with a impeller macerator, i think a vented loop is a must if you're discharging under WL.