X-Bob Posted April 7, 2009 Share Posted April 7, 2009 Greetings all We have a Swift with a "Truma Crystal Compact" water inlet. Just recently the Inlet has started to Outlet when the pump and water system is not connected i. e. when sitting on the drive at home. Now I know many people recommend draining down the hot tank before travelling but I have always left it full and this has never happened before. I just wondered if there is a one-way valve in the system which is designed to prevent water escaping from the hot tank when not in use? And if so, is it easy to change or repair? Quote Link to comment Share on other sites More sharing options...
DaveMac Posted April 7, 2009 Share Posted April 7, 2009 Greetings all We have a Swift with a "Truma Crystal Compact" water inlet. Just recently the Inlet has started to Outlet when the pump and water system is not connected i. e. when sitting on the drive at home. Now I know many people recommend draining down the hot tank before travelling but I have always left it full and this has never happened before. I just wondered if there is a one-way valve in the system which is designed to prevent water escaping from the hot tank when not in use? And if so, is it easy to change or repair? A quick phone call to Swift will get answer in regard to one-way valve, I would have thought. However leaving water in the system is not a good idea, particularly if you use during winter. The damage caused by a freeze-up (could this have happened to your 'van and damaged one-way valve?) could be v expensive, inconveinient and will not be covered under warranty! Sorry, not trying to preach, just helpful!! DavMac Quote Link to comment Share on other sites More sharing options...
kenles Posted April 7, 2009 Share Posted April 7, 2009 The one way valve is built in the water inlet housing as mine was leaking last week and now the new valve is not sealing so leaking back when the pump is fitted Quote Link to comment Share on other sites More sharing options...
X-Bob Posted April 7, 2009 Author Share Posted April 7, 2009 Thank you Davmac and kenles. I always drain down the system for the winter but we have had some severe weather this year so I thought perhaps some residual water could have frozen in there. Also my van is out of warranty anyway. I was really after information regarding the possibilities of changing the one way valve, but thanks again anyway. Quote Link to comment Share on other sites More sharing options...
X-Bob Posted April 10, 2009 Author Share Posted April 10, 2009 Greetings all We have a Swift with a "Truma Crystal Compact" water inlet. Just recently the Inlet has started to Outlet when the pump and water system is not connected i. e. when sitting on the drive at home. Now I know many people recommend draining down the hot tank before travelling but I have always left it full and this has never happened before. I just wondered if there is a one-way valve in the system which is designed to prevent water escaping from the hot tank when not in use? And if so, is it easy to change or repair? Not a very common problem I assume? Quote Link to comment Share on other sites More sharing options...
Arc Systems Posted April 11, 2009 Share Posted April 11, 2009 The Compacts NRV is in the outlet stem from it, where the cold water pipe inside connects. If your van has semi rigid pipework the the connection fittings don't use pressure to seal and therefore don't cause a problem, however, if hose clamped with jubilee clips, the clamping pressure can cause the stem to distort and jam the NRV open or shut. Beyond that, freezing water will distort the stem, or the valve seal and or it's 'shuttle' There are more reasons than freezing to drain down especially while on the move, with the Truma, mainly the extra weight causing more stress on floor and wall mountings that their designed to resist, on the older Carver Cascade, on damage to the heaters seals and more particularly the 'tie rod' holding it together. Quote Arc Systems are specialist Carver caravan product repairers, committed to providing a comprehensive service as well as spare parts for these popular heaters. Link to comment Share on other sites More sharing options...
X-Bob Posted April 12, 2009 Author Share Posted April 12, 2009 Many thanks Gary! Do you by any chance sell the NRV? Quote Link to comment Share on other sites More sharing options...
X-Bob Posted April 20, 2009 Author Share Posted April 20, 2009 Sorry to keep on, but . ....... Gary has informed me that there is a Non Return Valve and where it is. Unfortunately I have not been able to find out what it looks like or where to obtain it or even a part number. That is after ages searching the web and several trips to accessory shops and dealers. The Truma/Carver website only shows the inlet housing - nothing inside that. Can anyone help me with this one please? Quote Link to comment Share on other sites More sharing options...
Brecon Posted April 22, 2009 Share Posted April 22, 2009 That is because it is a non replaceable item which is built in during manufacture. If that is th ecause, then a new complete inlet is required. Quote Link to comment Share on other sites More sharing options...
matelodave Posted April 23, 2009 Share Posted April 23, 2009 If the non-return valve is leaking put one of these in line with it - a lot cheaper than replacing the whole inlet unit http://www. whalepumps. com/marine/product_list/5/46/ they are available from a decent caravan shop or more likely a boat chandlers Quote 2018 S-Max Titanium 2. 0 Tdci (177. 54bhp,180ps,132kw) Powershift + 2015 Unicorn III Cadz, Ventura Marlin porch awning Link to comment Share on other sites More sharing options...
X-Bob Posted April 24, 2009 Author Share Posted April 24, 2009 (edited) Many thanks to one and all for the help and suggestions. I have now had a very kind offer from Steve (Tradetech) of a replacement non return valve. I did also email Truma and I have included their reply for the benefit of others: TRUMA Park Lane, Dove Valley Park Foston, Derbyshire, DE65 5BG Truma Service/Technical 01283 586020 Lines open 8. 30am - 5. 00pm Mon - Thur, 8. 30am - 1. 30pm Fri Dear sir, The part number for the non-return valve is 40060-60700. If this does not fit properly, you would need to fit a new housing (part no. 46500-22). Your dealer should be able to supply this as well as the mastic you require. Yours faithfully Andrew Currie Service engineer Edited April 26, 2009 by X-Bob Quote Link to comment Share on other sites More sharing options...
meandmyvan Posted August 10, 2017 Share Posted August 10, 2017 Hello - I think I have a similar problem. Mine started leaking tonight after not being used only for a month (July - Aug so not cold enough to freeze). I had not drained it down. Also making a clicking noise although not connected to any thing while leaking out. Is this definitely a job for the experts rather than me going over a speed bump too quickly?! Am a complete notice and have only taken van out twice. Any comments much appreciated Quote Link to comment Share on other sites More sharing options...
Paul_B Posted August 11, 2017 Share Posted August 11, 2017 Is it leaking from the outside housing? as this is usually down to O-rings perishing or someone using Vaseline on them, or from somewhere inside the van Quote Paul B . .......Mondeo Estate & Elddis Avanté 505 (Tobago) Link to comment Share on other sites More sharing options...
WispMan Posted August 11, 2017 Share Posted August 11, 2017 Welcome and it may help if you explain where it is leaking from as this thread is over 8 years old. Just a thought, but it is best to start a new thread rather than adding to an old one. I do hope we can help you. Quote Graham Unless otherwise stated all posts are my personal opinion Link to comment Share on other sites More sharing options...
JBS Posted July 18, 2020 Share Posted July 18, 2020 I have same problem with hot water leaking back through compact crystal 2. Disconnected pump from housing and water continued to leak out. Tried fitting a non return valve but pump wouldn’t push water through. Removed it, replaced it with a straight connector and water pumped in again. Disconnected pump again and leak had stopped. Is there a built in NRV in the Compact Crystal which is allowing the leak? Quote Link to comment Share on other sites More sharing options...
JBS Posted July 27, 2020 Share Posted July 27, 2020 Further to my post about water leaking back to aquaroll, I fitted a one way return valve in line and that fixed the leak. Thanks for all your advice. Quote Link to comment Share on other sites More sharing options...
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