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Old 11-07-2013, 02:54   #1
Ced
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Join Date: Nov 2012
Location: On Giggles, QLD, Australia
Boat: Baltic. 1985. 11.58m
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Flooding head

Recently installed a new macerator head. The flush water inlet to the bowl is just above sea level but bowl continuously fills. Tried lengthening inlet hose to loop well above sea level but bowl still fills with fresh sea water and still overflows. Any hints please
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Old 11-07-2013, 04:23   #2
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Re: Flooding head

Vented loop would be a clue :-) Gonna need one.
Jay
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Old 11-07-2013, 04:59   #3
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Re: Flooding head

You have a syphon, but a vented loop on the inlet side would stop all water from getting to the head. The only solution I can think of is to raise the head by a few inches. You could install a check valve on the inlet side, but they can fail by getting a piece of debris stuck in them. A strainer before the check valve would help.
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Old 11-07-2013, 06:24   #4
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Re: Flooding head

A couple of possible solutions.

- Put a vented loop between the pump and the bowl(if possible with your macerator)

- If your sink drain is below WL then plumb a Tee into it below WL. The sink will act as a vented loop. This will also allow for fresh water flushing if needed.
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Old 12-07-2013, 04:29   #5
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Re: Flooding head

Here is a real simple instruction manual. Vented loop. We have about fifty electric heads in the charter fleet that I manage. I have installed more than a few of them.
http://www.go2marine.com/docs/mfr/jabsco/51021F.pdf
Jay
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