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Twin-coil central-heating diagram

  • 08-11-2011 11:38am
    #1
    Registered Users Posts: 99 ✭✭


    I need a diagram for connecting/fitting a twin-coil cylinder to connect with a solid-fuel stove, boiler and radiators.

    No luck in Google - can anyone help? Thanks. :)


Comments

  • Registered Users Posts: 40 ste15


    I am looking for the same, I know I have to run 1'' pipe from stove to twin coil cylinder and back again with its own water feed and expansion, but what I cannot work out is how to connect both systems together so I can heat my rads. Is it connect flow to flow and return to return with a non return valve on both and what size pipe should I connect with? Gas central heating is 3/4'' from boiler to cylinder.


  • Registered Users Posts: 3,953 ✭✭✭aujopimur


    Idealy you have 4 connections on the solid fuel appliance, 2 for gravity to the cylinder, the other 2 are linked to the oil/gas boiler with pump safety NR valves etc..
    These dual systems can be difficult to get working correctly.


  • Closed Accounts Posts: 4,677 ✭✭✭shane0007




  • Registered Users Posts: 56 ✭✭mark_18tp


    if you need a diagram to show you how to do this you really shouldnt be doing it.
    if installed incorrectly your back boiler will be a potential bomb


  • Closed Accounts Posts: 902 ✭✭✭DoneDL


    There is plenty of advice on google as regards layout of systems but solid fuel is not an option for guesswork. My best advice would be get a recommended plumber in and ask for advice.


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  • Registered Users Posts: 56 ✭✭mark_18tp


    by the way that document linked is showing an incorrect way. you would need an injector tee on a two pipe back boiler link up.


  • Closed Accounts Posts: 4,677 ✭✭✭shane0007


    mark_18tp wrote: »
    by the way that document linked is showing an incorrect way. you would need an injector tee on a two pipe back boiler link up.

    You will need to expand a bit more on how the diagram is incorrect.

    There is nothing wrong with it. Admittedly, having an injector tee will inprove the gravity circulation both when the pump is off and when it is on, but ultimately there is nothing wrong with the design and it works perfectly as intended.


  • Registered Users Posts: 1,107 ✭✭✭freddyuk


    You should also point out that the F&E tank should be fibreglass and the float valve should be copper ball. Plastic will melt if it all goes wrong.


  • Closed Accounts Posts: 4,677 ✭✭✭shane0007


    freddyuk wrote: »
    You should also point out that the F&E tank should be fibreglass and the float valve should be copper ball. Plastic will melt if it all goes wrong.

    It is a diagram not an technical instruction manual. It is intended for the use and interpretation of suitably competent and trained professionals. You will also notice that I did not quote the EN standards for the type of copper and fittings used nor the grade of copper for the cylinder. The dimensions of the internal coils are also not quoted.....


  • Registered Users Posts: 1,107 ✭✭✭freddyuk


    shane0007 wrote: »
    It is a diagram not an technical instruction manual. It is intended for the use and interpretation of suitably competent and trained professionals. You will also notice that I did not quote the EN standards for the type of copper and fittings used nor the grade of copper for the cylinder. The dimensions of the internal coils are also not quoted.....

    With respect you are a trained plumber and the OP was asking about how to.... and you offered a diagram. So in fact you appeared to be condoning the OP trying this for himself without pointing a couple of very basic safety issues. The post you referred to does not mention this either AFAIK.
    The thermal performance of the system was not something I was addressing but kids have died from having boiling water pumping over into plastic cisterns and coming through their bedroom ceiling so I thought it was worth mentioning. Some thermoplastic tanks are rated to contain 100c but they are more expensive and not fitted as standard.
    Overflow should be heatproofed also.


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  • Registered Users Posts: 44,080 ✭✭✭✭Micky Dolenz


    A bit basic but some good info none the less.

    http://www.boilerstoves.co.uk/installation-types.html


  • Closed Accounts Posts: 4,677 ✭✭✭shane0007


    freddyuk wrote: »
    With respect you are a trained plumber and the OP was asking about how to.... and you offered a diagram. So in fact you appeared to be condoning the OP trying this for himself without pointing a couple of very basic safety issues. The post you referred to does not mention this either AFAIK.
    The thermal performance of the system was not something I was addressing but kids have died from having boiling water pumping over into plastic cisterns and coming through their bedroom ceiling so I thought it was worth mentioning. Some thermoplastic tanks are rated to contain 100c but they are more expensive and not fitted as standard.
    Overflow should be heatproofed also.

    People shouldn't spit on the street but they still do, so my point is people should not install solid fuel systems unless they are suitably trained or experienced however, they still will. I would rather them follow an installation diagram that will be at the very least a safe installation rather then them picking what they can from the internet and doing it rather blind. If they do not want the back boiler to end up sitting on their lap, then they should use an experienced installer. If they want to have a go themselves, they probably will do in any case.

    Secondly, the incident you refer was an extremely isolated case in the UK a number of years ago. I have yet to see a fibre glass f & e tank installed neither in Ireland or the UK. Following that incident it was recommended that metallic overflow trays are placed underneath the f & e tank that is piped externally via its own overflow pipe.


  • Registered Users Posts: 1 David241173


    Shane 0007 your not a plumber only reading from books leave it to people who know


  • Posts: 0 [Deleted User]


    Shane 0007 your not a plumber only reading from books leave it to people who know

    Your nearly right there Dave, Shane is a plumber who can read from books:eek: which is always a good combination, it's the ones who don't read that cause the problems.


  • Moderators, Home & Garden Moderators, Technology & Internet Moderators Posts: 24,789 Mod ✭✭✭✭KoolKid


    David241173, you dig up a thread that a year old just to have a go at another user in your very first post here?
    The only reason I'm letting this go is because it is your first post.
    Please take a look over the forum charter here
    http://www.boards.ie/vbulletin/showthread.php?t=2055853624
    and also boards rules in general .
    Its generally not acceptable to dig up an old thread for no good reason.
    If your in doubt on anything else feel free to PM me anytime.


This discussion has been closed.
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