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prime never used electric head?
- Thread starter TIC
- Start date
- Joined
- Jan 1, 2000
- RO Number
- 3238
- Messages
- 4,831
"electric china head." covers a lot of ground. for specifics you need to know the make/model.
This info should be in the owner'smanual for the head ( the boat's owner's manual almost certainly will not cover this )
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Ok. Got that out of the way. If you know how a marine head works, the answer is obvious. If it is a pressurized fresh water head, any water required will be released into the bowl when the unit is operated. ( See head owner's manual ). If it is a raw water flush unit, the incoming water pump will be self priming, as the inlet side often loses it's prime in regular operation. ie: you should not need to prime the inlet side. If it seems needed, you have other issues. ( is the fresh water pressure pump on? Is the raw water through-hull seacock open? )
If you are talking about water resting in the bowl, that is actually a separate issue. In most cases, a marine head does not continuously have water resting in the bowl. In some cases, it does, but this is due to either a leaky valve ( ie: it is a problem ) or the unit was installed in such a way that water is retained in the bowl.
Note that in a marine head, it is usually not necessary, and in fact often undesirable, to have water resting in the bowl between uses. A marine head may seem to function in a fashion similar to a household toilet, but the only things in common are that they are usually made of china, and they process human waste. They function in a completely different way. Because a household toilet usus a "P-trap" to seal the room from sewer gasses it must have and maintain a water seal ( ie: water retained in the bowl ). A marine head uses pumps and valves to eject wastes from the bowl, and when everything is functioning normally, the bowl gets drained dry during flushing. In some cases, if a small amount of water is left in the bowl, and if the valves are no longer new and perfect, the water will seep out of the bowl and into the retention system.
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Gosh, I hope that covers it...
This info should be in the owner'smanual for the head ( the boat's owner's manual almost certainly will not cover this )
--
Ok. Got that out of the way. If you know how a marine head works, the answer is obvious. If it is a pressurized fresh water head, any water required will be released into the bowl when the unit is operated. ( See head owner's manual ). If it is a raw water flush unit, the incoming water pump will be self priming, as the inlet side often loses it's prime in regular operation. ie: you should not need to prime the inlet side. If it seems needed, you have other issues. ( is the fresh water pressure pump on? Is the raw water through-hull seacock open? )
If you are talking about water resting in the bowl, that is actually a separate issue. In most cases, a marine head does not continuously have water resting in the bowl. In some cases, it does, but this is due to either a leaky valve ( ie: it is a problem ) or the unit was installed in such a way that water is retained in the bowl.
Note that in a marine head, it is usually not necessary, and in fact often undesirable, to have water resting in the bowl between uses. A marine head may seem to function in a fashion similar to a household toilet, but the only things in common are that they are usually made of china, and they process human waste. They function in a completely different way. Because a household toilet usus a "P-trap" to seal the room from sewer gasses it must have and maintain a water seal ( ie: water retained in the bowl ). A marine head uses pumps and valves to eject wastes from the bowl, and when everything is functioning normally, the bowl gets drained dry during flushing. In some cases, if a small amount of water is left in the bowl, and if the valves are no longer new and perfect, the water will seep out of the bowl and into the retention system.
--
Gosh, I hope that covers it...
Thanks for the reply!.. Unfortunately there is NO documentation on the toilet that came with the boat.. I have documentation for EVERY OTHER system on the boat EXCEPT the head.. There is simply a big black button to push to flush and a through hull seacock.a holding tank and a pump out fitting.Turn water pressure pump on and push the button? that's it?
- Joined
- Mar 5, 2001
- RO Number
- 3655
- Messages
- 1,800
Darrell, call Mike Irving at Jabsco (978) 282-5227; he's my counterpart there. He's a real nice guy and will help you any way he can. You can also go to their website, to the marine portion of it, and possibly identify your head from the pictures they have posted there. You can even download and print out the tech info for the head. www.jabsco(dot)com