wiring info confliction

Discussion in 'Plumbers' Talk' started by jack of all trades, Feb 10, 2019.

  1. jack of all trades

    jack of all trades New Member

    Hi Guys
    Hoping someone can clarify wiring a new programmable room thermostat on my grant boiler
    have attached relevant page from boiler manual. The diagrams indicate that the wire to the boiler is a switch 230/240v live but the text on the left below warning header says volt free output.
    is anyone able to offer any thoughts ( current room stat also indicates its switched live)

    Attached Files:

  2. Mike83

    Mike83 Well-Known Member

    It looks like L1 on the boiler receives 230v from the programmer in the diagram.
  3. jack of all trades

    jack of all trades New Member

    Thanks Mike i agree with your conclusion but how can you have volt free connection which is a switched live
  4. Mike83

    Mike83 Well-Known Member

    It can’t really be volt free unless the boiler puts the power out, to then come back via the programmer.
  5. dobbie

    dobbie Well-Known Member

    It means that the internal workings of the timeclock are not linked.The clock and the output are not linked electrically internally in the clock.
  6. Mike83

    Mike83 Well-Known Member

    But the instructions and diagrams contradict each other.

Share This Page