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Help with wireless thermostat wiring

Discussion in 'Electrics UK' started by juco, 23 Oct 2015.

  1. juco

    juco

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    Current situation no timer but hardwired room thermostat.
    Previously had a hard wired timer/thermo but elec fitted current thermo
    only when the old one failed just to see me through the Summer.
    First image shows the boiler wiring and diagram.
    Second image the wiring diagram for wireless thermostat.

    My understanding:
    I take a live feed from the upper block terminals 1 & 2 that connects to
    mains input for the boiler. (This wire comes from a fused spur on the
    other side of the wall)
    I then connect N/O & COM to the boiler upper block terminals 4 & 5.
    I remove the red wire link in 4 & 5.

    [​IMG]

    [​IMG]
     
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  3. EFLImpudence

    EFLImpudence

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    Not quite

    numbers as per diagram.

    At boiler
    Where do the extra Browns and Blues from terminals N and 1 go?
     
    Last edited: 23 Oct 2015
  4. ericmark

    ericmark

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    From cable colours it would seem you have a motorised valve. If that's the case then the thermostat tells the valve to open then the valve tells boiler to switch on.
    [​IMG] typical.
     
  5. juco

    juco

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    Apologies as I created my own numbering and never realised the label had numbers/letters on it.

    The extra brown & blue go in to the PCB.
    I havent opened up the PCB unit as yet.

    I do have the PDF file for the boiler which gives the wiring diagrams. I could upload if required.
     
    Last edited: 23 Oct 2015
  6. EFLImpudence

    EFLImpudence

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    It appears Eric is correct.

    Do you have a motorised valve and wiring centre somewhere.
    What is the boiler make and model.
     
  7. juco

    juco

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    I cant see anything that states motorised valve in the manual. However when the original thermostat failed I seem to recall the plumber checking a valve that maybe sticking as I was getting hot water but no heating at the time, looking at that part on the boiler it states valve accuator.
    It is a Baxi Combi 100HE

    Wiring centre? Is that the main PCB?
     

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  8. EFLImpudence

    EFLImpudence

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    The valve(s) will be on the pipework somewhere and
    a wiring centre is a separate row of terminal blocks nearby connecting the cables from all the parts - power, timer, thermostat, boiler etc.

    Is this the right manual?
    http://www.acwilgar.co.uk/pdf/system-100he.pdf
    If so, see page 12.

    I'm not sure why it states all that for a combi-boiler.
    Do you have a hot water cylinder?
     
  9. juco

    juco

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    There is a actuator valve in an awkward spot connected to pipe work.
    The wiring centre from your manual (page 12) coincides with the image in my first post.

    That manual looks correct.

    No hot water cylinder, hot water comes direct from the combi boiler.
     
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  11. EFLImpudence

    EFLImpudence

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    Right.

    Yes, that is.
    There is usually another nearby.
    If the boiler one has been used for all the connections then you will have to work out from Eric's diagram where to connect the receiver.

    Can we have a picture of the area around the connectors so that we can clearly see where all the wires go?


    Ok.
     
  12. juco

    juco

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    Pictures, I can probably get better ones tomorrow if necessary.

    Do you need them closer?

    1 (1).JPG 1 (3).JPG 1 (4).JPG 1 (5).JPG
     
  13. EFLImpudence

    EFLImpudence

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    Like this one but so that we can see where they all go.
    upload_2015-10-23_22-54-58.png
     
  14. juco

    juco

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    OK I will do it tomorrow as I may have to stitch some images together to get them larger and make sense, so will need time to edit them.
     
  15. ban-all-sheds

    ban-all-sheds

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    You used to have a hard-wired thermostat.

    Now you have a wireless receiver hard-wired to the same wiring.

    I fail to see why there is a problem.
     
  16. juco

    juco

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    No!, I had a hard wired programmable thermostat that failed. An electrician wired in a thermostat only (free) just to get by for the Summer. I now need the heating to come on whenever as we approach the colder months so need to install another programmer/ thermostat, but I want a wireless version.

    The problem is I am not an electrician and appreciate any help I can get to make sure everything is safe.
     
  17. juco

    juco

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    Impossible trying to get an image that shows all the wiring and where it leads. I opened up the PCB as below.

    mains.jpg
     
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