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Thermostat Wiring Volt Free

Discussion in 'Electrics UK' started by MKBuild, 10 Sep 2020.

  1. MKBuild

    MKBuild

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    Hi

    Im looking to wire up a MI Monitor Thermostat to a Biasi Garda HE boiler. Please see pics of connection, first for boiler wiring and 2nd for thermostat connectors
    20200910_103113.jpg 20200910_103043.jpg

    Looking at the instructions i believe 1 need a 4 core cable, so live and neutral go to the boiler power block to power the thermostat, then the volt free connections from the thermostat to the external connections block by removing the jumper wire and wiring the volt free connections.

    Does that seem right, no need for switched live?
     
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  3. flameport

    flameport

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    Correct.

    If you connect live to the thermostat connections in that boiler it will be destroyed.
     
  4. MKBuild

    MKBuild

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    Many Thanks, and does it matter which way the volt free connections connect, i was going to do 3 on boiler to 3 on thermo, 1 on boiler to 4 on thermo

    Cheers
     
  5. MKBuild

    MKBuild

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    Also for the wiring, is it better to get a separate cable to run from the thermo to the boilers fused spur for power, then separate 2 core from the thermo volt free to the boilers volt free connectors?
     
  6. bernardgreen

    bernardgreen

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    That would be sensible
     
  7. flameport

    flameport

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    No.
    All the thermostat does is connect those two wires together when heat is required.
     
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