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wiring a Drayton LP722 into a nest

Discussion in 'Plumbing and Central Heating' started by JohnVegas, 19 Mar 2019.

  1. JohnVegas

    JohnVegas

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    I believe I have a s-plan heating system.


    I have looked in the airing cupboard and found 2 valves. One says for hot water

    20190319_143102.jpg

    The other says Zone valve but I dont think it is a Y-plan as there are only 2 settings.

    20190319_143049.jpg 20190319_144531.jpg

    Am I correct?

    Here is the wire for my Drayton LP722

    20190319_142059.jpg 20190319_150240.jpg

    Is it as easy as:

    upload_2016-12-5_9-59-13.png


    I will need to split my one live going into 1 into 2 wires that go into 2 and 5 on the nest


    Does that all seem correct?


    My only question is what do I do with my wall mounted old thermostat?
     
  2. ianmcd

    ianmcd

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    where does the wire in terminal 1 on the existing programmer go ?
     
  3. JohnVegas

    JohnVegas

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    Hi Ian,

    There is a blank faceplate next to the programmer. it goes into there and into a wire jungle. I could trace it once Ive switched the power off
     
  4. ianmcd

    ianmcd

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    cant understand what it could be used for , that terminal is used for a 3 port mid position valve and not used in an S plan as you have unles at one time there was a motor open motor close 2 port valve at some stage , the ones you have just now are spring return and wouldnt need this wire
     
  5. JohnVegas

    JohnVegas

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    So What do you think?
     
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