my van has 2 water pumps one runs the hot/cold water the other is just to flush the loo.is there any reason why i cant run the hot water to shower from the main one and the cold water to the shower from the other.thought it may give me a bit more oomph to the shower and make the water last a bit longer in the main barrel.
I cant see why not but is the pump for the toilet not less powerful than the main pump? And would you not need to do some creative electrics and plumbing to adapt the system?
Quote: Originally posted by MattCharlie on 22/1/2012
I cant see why not but is the pump for the toilet not less powerful than the main pump? And would you not need to do some creative electrics and plumbing to adapt the system?
Hi, was thinking the same kind of thing, could be to do with when in shower, and the cold water in kitchen used, you could get showered with very hot water only, as cold water gets drawn from the kitchen sink, maybe that’s what happened to the original owner of the van, and that was his way to solve the problem.
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Quote: Originally posted by MattCharlie on 22/1/2012
I cant see why not but is the pump for the toilet not less powerful than the main pump? And would you not need to do some creative electrics and plumbing to adapt the system?
no its a bog standard whale pump.the cold water to the shower would come from loo pump and all others from one that feeds rest and water heater.just need to sort electrics.all work on micro switch but was thinking of swapping pump to loo to pressure switch.the thinking was then when asked for cold water to shower mixer the pressure switched pump would operate.
Hi, using two pumps to the shower for more pressure ( if that is what you are saying) you will use more water quicker with two pumps than with one pump (higher pressure more water forced through shower head) if just connecting the shower micro switches to the pump for the loo (operating the shower pump and loo pump simultaneously, you may find that the loo will flush when you shower).assuming that the loo pump would still have its water feed to the loo. Or you could flush toilet and get shower. If you wish more pressure for the shower, better to fit a larger capacity pump, and an extra aquaroll.
------------- If everything runs smoothly then I must have done something wrong
If in Doubt Check it Out.
got 2 aquaroll one just for the loo thats why i thought about feeding shower cold from that.loo flushes by micro switch or pressure switch so turning on shower wont flush loo.other wise this would happen when turning on a kitchen tap a basin tap would run.but then you could be right with shower flushing loo only one way to find out loo is a thetford c200.
I would stick with simply using a more powerful pump from the main system. It would save a lot of messing and the possibility of over pressurising the toilet system which would need some sort of non return valve fitting plus an isolating valve to stop the toilet flushing when the shower was on.
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What you have described will work fine. The toilet has a solenoid operated valve, which open when the flush button is pressed, this is why the toilet pump has a pressure switch on it.
In theory you could simply tee off the toilet supply (after the pressure switch) & run a cold to the shower's cold side. Just disconnect the microswitch on the shower's cold tap, as it wouldn't be needed.
Hey presto, you've got a separate cold feed to the shower. (which would stop you getting scalded when someone turns on the cold tap at the kitchen sink, although I would've thought it simpler to just tell people NOT to touch ANY of the taps whilst someone is in the shower, but then people don't always listen, do they? )
too much pressure feeding the toilet flush outlet COULD result in a wet floor when operated if the shape of the toilet cannot cope with that amount of water,or wet legs.worth a thought.
------------- the only silly question is the one you do not ask.
Just spotted you have got an avondale. Im sure I read once in a handbook that some avondales had a seperate water inlet in the bathroom so that during the winter you can bring your aquaroll inside so it doesn't freeze. One should have a blanking plug so that you either use one or the other? Correct me if im wrong. If both pumps are plugged in and there is no non return valve on the cold water feeds then one pump could effectively be powering your shower and also pushing water through the other pump into the other aquaroll? I know a van I once had used to drain its hot water tank back into the aquaroll overnight until I fitted a non return valve.
I was under the impression that all fitted toilets in caravans had their own built-in flushing tank. I suppose the two pumps are not interchangeable? Wouldn't like the idea of feeding a pump to the main supply that had been connected to the toilet flush - back-feed of water, leeching of contamination, etc.
Wouldn't like the idea of feeding a pump to the main supply that had been connected to the toilet flush - back-feed of water, leeching of contamination, etc.
Bertie.
agree,but some caravan toilet flushes are now fed a the fresh water supply direct to the toilet.dont know how that works,as said i do not like the idea.
------------- the only silly question is the one you do not ask.
the 2 pumps are completely seperate with own power feed.this is a retro fit loo took my bench cassette out.there are 2 versions of the loo i bought. one with flush tank the other works off either an onboard tank or from an aquaroll.mine is the latter.i just thought that whilst i have an extra aquaroll with just the loo flush coming off it use it to cold supply the shower.the loo has a built in non return valve.
I've fitted those C200 toilets which work off the water system on boats before, they're quite commonplace, & it's only the flushing water.
The flush is operated at whatever the water pressure is, via a magnetic solenoid valve. If I remember correctly, they are supplied with 2 different devices, which you can fit in the feed pipe, to reduce the water flow rate if necessary (or there is some way of achieving this, as it can be a problem with higher pressure systems).
Both the ones I fitted on boats were fine & never gave any problems. It shouldn't be possible to ever get a back feed from the loo, & nothing on the system ever gave me any concern with this.
cambridgecockne; how is the loo pump operated on your system? I thought these toilets needed a pressurised supply? Or do they have terminals for a microswitch type system? If it's already got a pressure switch on this part of the system, then your shower's cold supply will be an easy job.
It seems a lot of trouble to go to, filling a whole Aquaroll just for toilet flushing, it might as well be put to better use.
they also have terminal blocks for micro switch.i have 1 pump on pressurised system the other is micro switched.i have 3 pump inlets on my caravan dunno why lol.
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Topic: 2 water pumps seperate feed
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