1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

New thermostat wiring

Discussion in 'Plumbing and Central Heating' started by Paulius, 22 Jan 2021.

  1. Paulius

    Paulius

    Joined:
    22 Jan 2021
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi, I hope someone can help me with this. I just got new thermostat but I'm a bit confused with the wiring. Because my old thermostat have only 3 cables- L,N and call for heat cable. The new thermostat I know when to connect L and N but I don't know in which port I need to connect -call for heat cable. I have standard boiler. Thanks for your help
     

    Attached Files:

  2. Sponsored Links
  3. stem

    stem

    Joined:
    20 Jul 2005
    Messages:
    6,553
    Thanks Received:
    1,506
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    Odd use of a green/yellow earth wire there but...

    Blue wire = N
    Brown wire = L
    Green/yellow = Switched live (call for heat)

    So for the new thermostat:

    Blue wire = N (3)
    Brown wire = L (4)
    Green/yellow wire = (2)
    Insert a wire to link together terminals L (4) and (1)

    Slip a brown sleeve over the green/yellow cable to show it is being used as a live wire and not an earth wire.

    If there is an existing timeswitch or programmer somewhere and assuming that the new thermostat is a programmable version, the timeswitch should be set to be permanently on 24/7
     
    • Thanks Thanks x 1
    • Like Like x 1
  4. Paulius

    Paulius

    Joined:
    22 Jan 2021
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Great. Many thanks for helping me with this
     
Loading...

Share This Page