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Connecting Nest HeatLink to Potterton Boiler

Discussion in 'Plumbing and Central Heating' started by vovski, 7 Nov 2019.

  1. vovski

    vovski

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    • duplicate threads merged
    Boiler Connections.jpg Boiler Terminal Block.jpg Honeywell thermostat THR872CUK.jpg Nest HeatLink.jpg

    Hi all,
    Would love to have some advise on how to connect the Nest 3rd Gen Heatlink to my Potterton Gold Combi 33HEa.
    There is currently a Honeywell THR872CUK connected to the boiler which is being used with a Honeywell wall thermostat, but I would be removing the wall thermostat completely and using the Nest thermostat in its place in a different location.
    I have supplied some pictures with the current wiring as is connected at the moment to the current stat.
    What wires would I need to connect to the heatlink and it what configuration as per my wiring labelling ?

    If you require any further information please let me know

    I would like to thank you all in advance for any help or advise offered
     
    Last edited: 7 Nov 2019
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  3. vovski

    vovski

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    Hi all,
    Would love to have some advise on how to connect the Nest 3rd Gen Heatlink to my Potterton Gold Combi 33HEa.
    There is currently a Honeywell THR872CUK connected to the boiler which is being used with a Honeywell wall thermostat, but I would be removing the wall thermostat completely and using the Nest thermostat in its place in a different location.
    I have supplied some pictures with the current wiring as is connected at the moment to the current stat.
    What wires would I need to connect to the heatlink and it what configuration as per my wiring labelling ?

    If you require any further information please let me know

    I would like to thank you all in advance for any help or advise offered
     

    Attached Files:

  4. Johnmdc

    Johnmdc

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    As you have marked your cables

    L1 and L3 to L on nest
    N1 and N3 to N on nest
    L2 to 2 on nest
    N2 to 3 on nest but note even though this is a blue wire it is NOT a neutral. It is the switched live so should have brown sleeving or tape on it to indicate that it is a live wire.
     
  5. stem

    stem

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    The wires in N at your current stat go to the Heat link (N)

    The wires in L & L at your current stat go to the Heat link (L)

    The wire in A at the current stat goes to Heat link (2) Heating common

    The wire in B at the current stat goes to Heat link (3) Heating call for heat

    The Nest thermostat can be powered by a plug in power supply, or wiring its T1 & T2 terminals to T1 & T2 at the Heat link.

    The earth connection goes to the earth connection next to T1

    The existing wiring has been badly installed, there shouldn't be lots of copper visible at the terminals, and no whiskers poking out. The terminals at the Heat link are very close together and there is a risk of a short circuit it the wires aren't terminated properly.

    This is how they should look.

    Capture.JPG

    This is a different installation to yours, so don't worry that it doesn't match exactly, I've just posted it to show how the terminations should be done.
     
    Last edited: 8 Nov 2019
  6. vovski

    vovski

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    thanks very much for your help, well appreciated
     
  7. vovski

    vovski

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    thanks very much for your help, well appreciated :)
     
  8. stem

    stem

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    Vovski you have posted this question twice, and both myself and @Johnmdc have taken time to help you. One of us unnecessarily.

    Forum rule 5 states:
    rules.JPG
    For your future reference, the rest of the forum rules can be found here.
     
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