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Install Nest over Potterton EP2002 Y-Plan

Discussion in 'Plumbing and Central Heating' started by mfizz, 23 Feb 2018.

  1. mfizz

    mfizz

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    So there I was I planned everything in advanced for my father's home. He sent me all the details of our current boiler and heating system and I was convinced that it was a y plan system because i have a 3 port valve that says "y plan". I arrive to do the job and I see this silly wire set up. Why can't they just set it up normally. So now I'm wondering how to decode this and wire it up to the nest 3rd gen properly. N and L are simple enough. What's the business going on in terminal B and D. I could do with some help please.

    My setup is as follows:

    Potterton Suprima Boiler
    Potterton Ep2002 programmer
    Potterton prt 2 room thermostat
    Potterton ptt cylinder thermostat
    Honeywell sundial y plan 3 position diverter valve
    Gundfoss pump

    I haven't started the job just yet I want to make sure I've got the wiring right way round in my head.
     

    Attached Files:

  2. A-D are spare terminals used for linking wires as required,they do not take part in any switching.

    Is the existing programmer set to gravity operation ?
     
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  4. mfizz

    mfizz

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    Hello, thanks for the response. It appears to be in the fully pumped position as the little switch is in "-" position.
     
  5. mfizz

    mfizz

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    So I plan on doing the following:

    Potterton -> Nest
    N - N
    L-L
    3-6
    4-3

    In a separate block:
    Connect all B together
    Connect all D together

    Then on the heatlink:
    L-2-5 (using the wire left from L-5 from old programmer)

    Then on the room thermostat
    H-TL
    Terminate neutral
     
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