Recent content by oyster2871

  1. O

    Drayton Wiser with heat interface unit

    So the Hub’s now wired in and it seems to be working very well indeed, with the thermostat finally being in a sensible place in the living room. Thank you all so much for your patient and detailed help!
  2. O

    Drayton Wiser with heat interface unit

    Thank you - that makes sense to me. One thing I find confusing still is that the wiring diagram mentions that a 3A fuse is required. I initially thought that this would be on the L but looking more closely at the diagram and the instructions, they say that “power should be put on to Terminal 1...
  3. O

    Drayton Wiser with heat interface unit

    In the junction box at the terminal block I measured the following: HIU circuit breaker OFF - yellow-green to brown 0.4V - yellow-green to grey 0.4V - brown to grey 0.02V HIU circuit breaker ON - yellow-green to brown 233V - yellow-green to grey 0.4V - brown to grey 232V
  4. O

    Drayton Wiser with heat interface unit

    I found a junction box above the HIU. There is a grey wire with a blue sleeve wired to neutral.
  5. O

    Drayton Wiser with heat interface unit

    So here are the results: HIU circuit breaker OFF - yellow-green to brown 21V - yellow-green to grey 0.5V - brown to grey 11V HIU circuit breaker ON - yellow-green to brown 234V - yellow-green to grey 12.5V - brown to grey 158V
  6. O

    Drayton Wiser with heat interface unit

    OK, let me investigate the wires with a multimeter. Looking at the photos, looks like there is a green-yellow wire too so possibly there may be everything needed there already.
  7. O

    Drayton Wiser with heat interface unit

    There is also a light switch right next to the thermostat - if using an existing light electric circuit for this is acceptable, there is live, neutral and ground available about 15cm away.
  8. O

    Drayton Wiser with heat interface unit

    Thanks. Behind the thermostat wall there is a utility space with the consumer unit. I was thinking that in the worst case I could have an electrician add a new circuit for this purpose. Do you not think this is a good idea? Regarding the Google Nest E, with Google's reputation for shutting down...
  9. O

    Drayton Wiser with heat interface unit

    Thank you both. Based on what you said I identified the wiring diagram in the installation manual and attached it below. It will need four connections: 1. N (2) - neutral - currently missing, would need to be provided 2. L (1) - live - currently missing, would need to be provided 3. COM (4) -...
  10. O

    Drayton Wiser with heat interface unit

    I live in a building with communal heating provided via a heat interface unit in the flat. There is no boiler in the flat. Heating is controlled via a battery-operated wired thermostat located in a very inconvenient place. From what I can see all my current thermostat does is turning the heating...
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