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Nest 3rd gen to replace British Gas WR1

Discussion in 'Plumbing and Central Heating' started by James4321, 24 Nov 2018.

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  1. James4321

    James4321

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    Hello,


    I’m looking for some help with a 3rd gen nest install. I have done quite a bit of research, but I’m yet to find the answer. I don’t profess to know to allot about these but I’m sure someone can help me pretty quickly and maybe help others in the future by doing so.

    upload_2018-11-24_18-54-52.png

    From what I’ve read and researched I believe the config should be as follows, although I’ve not seen anyone who has had two power leads connected and I believe I should just connect both the wires?

    Both Blue cables to N in nest

    Both Brown cable to L in nest

    The Black cable in 1 is “HW satisfied” nest 4

    I’ve no idea where to put the brown cable in 4

    I’ve no idea what to do with the earth cables yellow and green


    Any help is really appreciated.

    Thanks
     
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  3. stem

    stem

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    Sorry, but your enquiry is confused and makes no sense.

    You give no information about your heating system but post a picture of a back plate from something, but don't say what it is from. Is it a programmer? or a thermostat (the back plates are the same)

    It looks to me like a thermostat from where the wires are connected, but then you mention HW (hot water) hot water wires do not go to a thermostat they go to a programmer.

    So:

    1) Please describe what you have posted a photo of. (ie Programmer or thermostat and its make and model)
    2) What sort of heating system do you have? (combi boiler / or system with a hot water cylinder)
     
  4. James4321

    James4321

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    Hello,

    Thanks for the reply. Sorry, I didn't mean to be confusing. The first photo I attached in the post is of the backplate for the WR1 wireless system. The below is of the WR1 unit with the device connected to it.

    [​IMG]

    This connects wirelessly to this unit

    [​IMG]


    The heating system is a combi boiler a Worcester bosch 532/i


    Thanks
     
  5. stem

    stem

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    Unfortunately I can't see your later pictures, but if you have a combi, you should have the Single Channel version of the Hive, which doesn't have any HW (hot water ) control.

    Hive SC.png

    The BG WR1 receiver is actually a rebadged Drayton SCR, they are wired as below, you shouldn't have a wire in terminal 2.

    SCR.JPG

    As you don't have stored hot water control to take into account, your installation is really simple.

    As you have figured the wires in N & L are straight forward they will move to the Hive N & L respectively

    The wire in terminal (1) will move to the Hive terminal (1) Common.

    The wire in terminal (3) will move to the Hive terminal (3) heating call for heat.

    As you still haven't mentioned what is controlling the existing receiver, I don't know if time control is included at the existing thermostat or not. However, if there is any other existing time control, such as a time switch fitted on the boiler, that will need to be set to be on permanently 24/7.
     
  6. James4321

    James4321

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    Hello,

    Thanks for the reply. The information about the Drayton is really useful. Its a nest not a Hive that I'm am installing. I just need to figure out which terminals are common and call for heat on the nest 3rd gen.
     
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  8. stem

    stem

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    Ah sorry, too many Nest and Hive threads flying around at the moment.

    N and L are self explanatory

    Terminal 2 is the Heat link heating common and terminal 3 is the Heating call for heat.

    You may see other threads making reference to a link between L and 2. If you have 4 terminals with wires in at the existing receiver, you don't need to do that.

    hl.jpg
     
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  9. James4321

    James4321

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    Hello,

    Thanks for your help. I've done the install today and it all seems fine so far. I didn't do the link between L and 2 as I had the four connections in total including the power (5 if you count the earth).
     
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  10. jeffaldo

    jeffaldo

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    Hi James, just got my Nest and the back plate for the existing programmer is exactly the same as yours. Can I please ask 2 things: 1. I'd assume you put the earth on the earth connection as per the photo above? 2. did you have the British Gas Wireless system in your connection?
     
  11. ianmcd

    ianmcd

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    yes the earths just go into the earth terminal on the nest, but unless you are powering the nest thermostat using T1 & T2, you can just join the earth wires in a terminal strip and isolate
     
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