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Discuss 3 zone EvoHome setup? in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Chevalier

    Chevalier New Member

    Hi,

    Wonder if someone can help, been trying to get an answer from Honeywell but can’t seem to get through with email or phonecalls :)

    I’m replumbing my house (engineer, not a plumber) and am looking to do the below using EvoHome, but not sure if it works as I expect.

    Setup:
    S-Plan
    Worchester Combi boiler
    3 Zones
    -UFH, one large room
    -Rads downstairs
    -Rads upstairs


    Think I need to purchase the below, but any input would be great!

    1 * Evo Home controller and Relay (this does zone 1)
    https://theevohomeshop.co.uk/en/hon...me-connected-thermostat-pack-atp921r3100.html

    2 * thermostats/relay combination (these do zones 2 and 3)
    https://theevohomeshop.co.uk/en/hon...ostat-dt92e.html?search_query=dt92e&results=4

    3* motorised valves (closed)
    https://theevohomeshop.co.uk/en/mot...43h1056-22mm-motorised-2-port-zone-valve.html

    Thanks
     
  2. Stanios

    Stanios Plumber GSR

    Yep spot on. However if you are unsure about this right at the beginning I would advise you to hire an evo installer to install this for you. Wiring 3 zones into single wiring centre can get quite messy and requires pros touch.
     
  3. Stoney Ground

    Stoney Ground GSR

    Or an electrician and then a cleaner to tidy up :clap:
     
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  4. Stanios

    Stanios Plumber GSR

    An electrician, cleaner then a plumber to rewire it so it works
     
    • Funny Funny x 1
  5. Chevalier

    Chevalier New Member

    I'd be happy enough on the wiring side, but the initial config isn't' really shown online anywhere so didn't fancy ordering a few hundred quid of kit to find it doesn't do what I want :)

    Thanks for the help
     
  6. hENRYDAC

    hENRYDAC Henrydac

    This might be what you're looking for

    IMAG0209.jpg
     
  7. Worcester

    Worcester Plumber

    Just in case the OP didn't get the answer a Honeywell Evohome system can only operate one heating zone valve per central controller, 'sub zones' are managed by the radiators stats. a second 'zone' valve can operate the DHW.
    If you need more than one heating zone valve, you have to have more that one Evohome central controller.
     
  8. Chuck

    Chuck Active Member

    You'll probably have more luck getting advice from:

    Contact Us - The EVOHOME Shop

    you want pre-sales technical support.

    Edit: Oops, old thread. Still, someone might find the pointer useful.
     
  9. Chevalier

    Chevalier New Member

    Thanks for all the comments, have been silent but planning in the mean time!

    I purchased the list I initially made and Honeywell said it would work, but there's no wiring diagrams that match my setup so I created the below wiring diagram - anyone here familiar enough to spot if I have any mistakes in it? (clearly I am avoiding other necessary building work by making a diagram like this!!)

    Seems like the orange/grey wire use is reversedon the EPH valve I have (compared to other online discussions) so included details of it here too..

    Thanks in advance..

    View attachment 30940

    3 zone EvoHome Wiring Diagram.png

    BDR91 schematic.jpg

    EPH V221P Valve Schematic.jpg
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Looks fine but a needs to be linked to the live (normally just link the live to A )

    Would connect n to main neutral and not neutral S on the boiler
     
  11. Chuck

    Chuck Active Member

    This can be done inside the BDR-91s

    I'd leave it as shown on the diagram. Best practice is not to steal neutrals. By connecting to NS one is assured that when the boiler is isolated (it should have a double pole disconnection method) all the CH wiring is dead.

    The issue I see with the OP's diagram is the L and N terminals have a lot of wires going into them. Might be worth using a couple of links and putting the unused terminals to work if things are going to be too tight.
     
    Last edited: Sep 11, 2017
  12. Chevalier

    Chevalier New Member

    Thanks for the quick replies!

    For the link from live to A, I did this inside the BDR91 with the red fork in the diagram 0 is this what you guys mean? I also looped L to L to A if that makes sense..

    Thanks again
     
  13. Chevalier

    Chevalier New Member

    Seems I forgot to add in the UFH pump which is separate to the boiler integrated pump!

    Can I just take the 220V from the grey wire the UFH zone valve and connect that to the UFH pump Live or will the current be too much? Not sure how else I could get the UFH pump to only come on with the UFH zone if not done that way.

    Thanks :)
     
  14. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    yes normally fed from the orange wire on a normal port valve so yes grey for you
     
  15. Worcester

    Worcester Plumber

    Unless Honeywell have changed something very significantly recently, as I understand it, one Evohome controller can only control a single heating zone valve - 1 x BDR91 for heating and 1 x BDR 91 for DHW.
    Please correct me if I'm wrong, as we are constantly discussing this requirement with Honeywell. (all new buildings >150m2 should have a minimum of 2 zones)
    They keep telling me that to to control three heating zone 2 port valves separately I'll need 3 Evohome controllers.
     
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