Hello Everyone,

We are new to the forum & also new to caravanning in total.
We recently picked up a new 2022 530 60yr edition (from Red Lion in Southport).We understand that they are a newly appointed dealer, but have to say the service they gave us (being complete newbies) was excellent.
However I should stop rambling & get on to my problem/question.
Our caravan is configured with a 40l internal water tank & also a comet external pump connection (pipework & pump supplied). Red Lion suggested that this pump was for filling the onboard tank from an aquaroll or similar. Suggesting that the external pump is switched on by the manual switch located in the comet housing.
We have just returned from our first few days away & can report that this is not how it operates.


What I am certain of is as follows:

The external switch controls the internal pump - without it being switched on there is no water at any tap or shower.
The external pump (if connected) runs whenever a tap is opened, regardless of the position of the external switch.
If the external switch is on - both pumps run when a tap requests water, the internal tank empties quicker than the aquaroll. When you turn the tap off the water from the internal tank backfills the aqua roll & overflows until the internal tank is empty.
If we connect the external pump & don't switch the internal pump on, water is supplied from the aquaroll but again when resting the internal tank backfills the aquaroll, overflowing until empty.

I have read the manual several times & can't find any detail on how this 'optional feature' should operate.

Does anyone else have this option and can confirm how it should work?
Also I have a water drain cock (plastic fitting with a blue screw head) located near to the internal tank which is leaking (very) slightly. Does anyone know where I can buy a replacement?

Any help you can give is appreciated.

Regards
Andrew

I can't answer your questions but I suggest that you go back to the seller and get them to
A. Explain how everything in the van works.
B; fix the leaky bung.
For what you've no doubt paid for you van, they should be working harder for you!

I can't figure out whats happening but wonder if your system uses tap micro switches or is pressurised or a mixture of both ?. Its like the internal tank is seing a drop in pressure so is running.

These links may help build a picture.

https://www.caravantalk.co.uk/community/...ter-bugfeature/

https://www.caravantalk.co.uk/community/...h-a-hymer-nova/

Steve

Thanks for your responses - I will contact the supplying dealer again, but their initial instruction was wrong - so I doubt they know any better -- although I presume they can get a definitive answer direct from Hymer. If I get anything I'll share it here.

The leaking drain cock appears to be leaking from the one side (pipe connection only), not leaking out through the drain point. I am aware that this would be covered under warranty, but the dealer is 3 hours away, so if I can just buy a replacement that may be easier. I suppose I could ask them to source and post a replacement.

When the water back fills & overspills the aquaroll no pump is running - it seems to be a sort of syphoning effect.

The top of the aquaroll is open with just the comet pump/pipe lowered into it. Is it possible to buy a different sealed top for the aquaroll - that would allow the pump tube to pass through whist forming a water tight seal?

This would prevent the water overspilling, although i presume it would then be necesary to provide an air vent also.

Thanks again
Andrew

Quote: ajsms999 wrote in post #5

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When the water back fills & overspills the aquaroll no pump is running - it seems to be a sort of syphoning effect.

The top of the aquaroll is open with just the comet pump/pipe lowered into it. Is it possible to buy a different sealed top for the aquaroll - that would allow the pump tube to pass through whist forming a water tight seal?

This would prevent the water overspilling, although i presume it would then be necesary to provide an air vent also.

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I am not sure of the configuration of your system but I seem to recall that someone had a similar issue with the water siphoning back into the aquaroll and it was fixed by a one way valve that should have been installed at manufacture being inserted. Red Lion need to give you further guidance on the system operation perhaps a short video from them may help?

Just looked at the plumbing behind the external 'comet' socket - no non return valve fitted - it just comes in and goes to a 'T' into the existing plumbing. I am certain that's my problem. - Thanks everyone
Does anyone know what size the standard pipework is?
I can find both 12mm & 10mm NRV's readily available.

Regards
Andrew

I think the clue is, in a sense, in the name. The 'city' is meant to imply that the facility is for connecting mains water pressure taps to, not Aquarolls. I doubt UK water authorities would agree but the design expects having to limit inward high pressure and doesn't concern itself with backflow because connected to the mains there wouldn't any.
Following on from that, if you do wish to use water from an Aquaroll, can it not be set up just to supply to the internal tank and water for inside the van drawn off from that?

Hi Andrew, it does appear that a non-return valve should be fitted in the pipework and also one should be included in the on-board tank pump.

Comet System.jpg - Bild entfernt (keine Rechte) (inner canister = on-board tank)

Your pipework will be 10mm internal diameter.

Quote: eribaMotters wrote in post #3

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I look forward to the answer so on how the "City Fill" works.

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They seem to be a standard fit recently - I noticed one on a new 540 I'm fitting extra 230V sockets to.

Was the Comet pump that plugs into the housing included?

Thanks JohnE & Colin,

That seems to solve my problem - there is no NRV on the external supply connection. Seems another one forgotten by Hymer!! Caravan is brand new - built in March 22.

The connection is not the city fill & is supplied with the comet submersibe pump - as per Colin's description.

Regards
Andrew