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R6660D with fuse box to nest e thermostat heatlink

Discussion in 'Plumbing and Central Heating' started by Romedan, 5 Dec 2020.

  1. Romedan

    Romedan

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    I've had a quick look on the forum and have found similar but nothing I can see that's double cabled and with a fuse box.

    I think I've identified the black as C and grey as NO via the forum.

    Question is, what do I do with the wires from the boiler and fuse box. I'm assuming these do not go to the nest heatlink but still need to be connected?

    honeywell.jpg fuse.jpg
     
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  3. stem

    stem

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    The two live wires need to remain connected together, and the two neutral wires need to remain connected together. The Nest Heat link does need a 230V supply so normally they would normally be connected there. So normally it would be connected:

    Both wires in R660D N go to Heat link N

    Both wires in R660D L go to Heat link L

    Wire in R660D A goes to Heat link 2 Heating 'common'

    Wire in R660D B goes to Heat link 3 Heating 'call for heat'
     
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  4. Romedan

    Romedan

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    Sorry I should have mentioned it was UK version and is powered by batteries so not 100% on the 230v supply?
     
  5. stem

    stem

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    Ah OK, then the two lives should be put in a separate terminal connector so they are connected together and the two neutrals in another connector, they can be tucked away in the corner. Only the wires from A and B should go to the Heat link.

    No need to apologise I should have guessed it was a Nest-e when you said C and NO
     
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  7. Romedan

    Romedan

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    Thanks :D, I'm now the proud owner of an installed nest e thermostat. Seeing all those wires for the first time was a bit daunting. Turns out it was the easiest part of the whole process.
     
  8. Romedan

    Romedan

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    Feel I need to come back to this, while the heating works fine. The hot water is luke warm unless I have the thermostat on/above 20°. There's nothing showing in the app that says it's controlling the hot water. Perhaps I've gone wrong somewhere during the setup.

    I'll post a photo of the nest wiring once I get home.
     
  9. ianmcd

    ianmcd

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    you cant control HW with a NEST E, you have bought the wrong Nest
     
  10. stem

    stem

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    As @ianmcd The R6660D is a receiver for an existing central heating thermostat. If you have replaced that with a Nest-e then it will just control the central heating as did the previous central heating thermostat.

    You didn't mention any hot water control, however, If you have a hot water cylinder, then the control of that will remain as it was, via the original programmer and hot water cylinder thermostat. Nothing to do with Nest-e
     
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