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British Gas thermostat Receiver with Nest

Discussion in 'Plumbing and Central Heating' started by Edge_ejj, 12 Sep 2020.

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  1. Edge_ejj

    Edge_ejj

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    Apologies... I know this is much discussed thread. I have looked at others but none exactly much my wiring. Attached are pictures of current wiring and nest... could someone advise how to wire nest.

    Thanks in advance
     

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  3. stem

    stem

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    The Nest-e receiver is battery powered, so the wires currently in L and N aren't required, and should be removed / isolated safely out of the way. Then the remaining wires in 1 and 3 go to the Nest C and NO.

    Edit: Nest provides both time and temperature control in a single unit. You don't mention any existing time control anywhere, but if you have a timeswitch somewhere that is controlling the heating, that should be set to be permanently 'on' otherwise it will interfere with the operation of the Nest.
     
    Last edited: 13 Sep 2020
  4. Edge_ejj

    Edge_ejj

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    Thank you
    Yes, I have a timer and will leave as always on.

    I’m going to fit later. Thanks for advice.
     
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  5. ericmark

    ericmark

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    The original base plate you show is reasonably genetic, it can be used for CH (central heating) and DHW (Domestic hot water) or just one. I assume only used for CH? the British regulations require an earth wire for any fixed unit, but you can have a flex to class II item without an earth, but using the earth wires as a conductor is rather bad practice even if not against the regulations.

    Nest e is designed to work either on/off (digital) or up/down (analogue) in this case analogue is far better than digital, so if the boiler is OpenTherm enabled then far better to use that option, but depends on the boiler as to if it has option or if it can be wired without removing gas tight panels.

    However since using an earth wire for control it would seem not fitted by a professional in first place so would not be worrying about using a gas safe person to any great extent, but would do alterations just before next service so it can be tested.

    If that wiring was found on an EICR it is possible it could be given a code C2, personally I would not award C2 not even sure if would give it a C3, but some inspectors are rather pedantic, giving C2 for items which were never wrong when fitted, like plastic CU and no RCD protection, so if you need an EICR doing then would be better if this is corrected.
     
  6. Edge_ejj

    Edge_ejj

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    Thank you.

    Only used for CH.

    I have fitted as per ‘stem’ advice and all appears to be working.
     
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  7. ianmcd

    ianmcd

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    Yep as @stem advised is the correct way to do it, forget about the OT option as the wiring at the boiler end is not connected to OT
     
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