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Installing Nest System...wiring help

Discussion in 'Plumbing and Central Heating' started by lawrencecraig, 5 Jan 2015.

  1. lawrencecraig

    lawrencecraig

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    Location:
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    All,

    I have recently purchased the Nest Thermostat with Heat Link and looking to replace my existing Honeywell T6360B. This thermostat is on the ground floor (lounge) and the boiler upstairs in the bedroom (combi boiler)

    My Honeywell T6360B is wired as follows:

    http://www.montel-css.co.uk/SupOther/Resources/dsc02209.jpeg

    The wiring is as follows:

    Red - Live 230V
    Blue - Neutral
    Yellow/Green - Earth
    Yellow - Connected to live supply when calling for heat

    It looks like this:

    http://www.montel-css.co.uk/SupOther/Resources/honeywellt6360wi.jpeg

    The heat link is to be wired as follows:

    http://i.imgur.com/2Ir8vfh.png

    Can I therefore connect the Red to 3, Blue to N, and the Yellow to L with a jumper cable to 2. Is it that simple or am I missing something?

    I will be connecting the actual nest thermostat via USB.

    Any help would be appreciated. I am considering bringing a professional in but would like the above answered so I can understand the install. Thanks!
     
  2. jackthom

    jackthom

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    You need

    Red to Live (L)
    Blue to Neutral (N)
    Yellow to 3
    And a short Link from Live to 2.
     
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  4. lawrencecraig

    lawrencecraig

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    Does the earth need to go anywhere? Does it matter than the heat link is downstairs and the boiler upstairs? The manual recommends it's placed near the junction box. I could trace the wires back to the junction box I guess.
     
  5. jackthom

    jackthom

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    You don't need the Earth connection for the heatlink. Just make sure it's safely covered up so it can't come into contact with any live wires.

    You could trace the wiring back to the junction box as that would probably be the tidiest place to install the Heatlink rather than on the wall where the old thermostat was located, although that too will certainly work OK.

    If in doubt, post a picture of the wiring centre/junction box and someone will help.
     
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  7. lawrencecraig

    lawrencecraig

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    Great, will give it a try. Thanks for your help!
     
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    DIYnot Local

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