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Discuss 2 port valves __________ in the Central Heating Forum area at UKPlumbersForums.co.uk.

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  1. Loubanez

    Loubanez Member

    Are 2 port valves necessary on the 15454653639711748620316.jpg flow of heating if a underfloor heating manifold is used such as this one in the picture? As far as i was aware the manifold acted as a valve.
    Thanks
     
  2. chris watkins

    chris watkins Plumber

    The manifold controls the temperature of the water & the rooms but what it can't normally do is provide an "interlock" with the boiler which is required by Part L of the Building Regulations.
    Effectively what this means is that when the last power head on the manifold closes there must be a mechanism that turns the boiler off to stop it from wastefully cycling.
     
  3. chris watkins

    chris watkins Plumber

    It also normally provides independent time control for the U/F against other heat emitters or areas which is also a requirement.
     
  4. Loubanez

    Loubanez Member

    Ok i thought the actuators provided effective open close mechanisms for the zones, are you saying that the for the SL for the boiler should be wired in series via the 2 port valve?
     
  5. Loubanez

    Loubanez Member

    Their is interlock terminals on the wiring centre for the manifold
     
  6. Jones82

    Jones82 GSR

    wouldn't a room stat wired into the underfloor pump and boiler act as an interlock?
     
  7. chris watkins

    chris watkins Plumber

    SWL through the end switch of the zone valve is the norm.
    It is down to you to prove / provide that the "interlock" is in place if not.
     
  8. Loubanez

    Loubanez Member

    Ok think I'm with you, bear with my I'll just a humble spark, so valve wired to far left interlock terminal and then switch wire off to boiler. 15454727486191005077118.jpg
     
  9. Craig Watson

    Craig Watson Plumber GSR Top Contributor!!

    How can that manifold not provide interlock? Interlock is easily provided by the room thermostats that will be used for each zone. Zone valves are used to separate systems when required. If you have a fully pumped/system boiler then yes a zone valve is required to separate the heating and hot water circuits but if you don't require your ufh to be separated from your radiator circuit then a zone valve isn't required.
     
  10. Loubanez

    Loubanez Member

    There is no radiators purely underfloor heating 6 zone each with a programmable stat
     
  11. Craig Watson

    Craig Watson Plumber GSR Top Contributor!!

    Is it a combi or fully pumped system?
     
  12. Loubanez

    Loubanez Member

    Unvented cylinder with electric boiler
     
  13. Craig Watson

    Craig Watson Plumber GSR Top Contributor!!

    Yes you will require a zone valve to separate the heating and hot water circuits
     
  14. Loubanez

    Loubanez Member

    I already have a valve on the hot water for the cylinder but do I need another one for the heating? Or will the manifold suffice?
     
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Best to else you could get warming of the ufh when the hot water is on
     
    • Agree Agree x 2
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