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Wiring for Vaillant 938 NEST install

Discussion in 'Plumbing and Central Heating' started by abzman1, 15 Dec 2017.

  1. abzman1

    abzman1

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    The heatlink connects upto 230V L/N/E, however which should the 2 call for heat wires go? Is it the 24V RT or the 230V RT?
     

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  2. flameport

    flameport

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    You can use either, but not both, and if you end up with 230V on the 24V connectors, the PCB will be destroyed.
     
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