R6660D with fuse box to nest e thermostat heatlink

[Romedan]

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?

 

[stem]

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'

 

[Romedan]

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

All wires in R660D N go to Heat link N

All wires in R660D L go to Heat link L

Wire in R660D A go to Heat link 2 Heating common

Wire in R660D B go to Heat link 3 Heating call for heat

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

 

[stem]

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

 

[Romedan]

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

Thanks , 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.

 

[Romedan]

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.

 

[ianmcd]

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.

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

 

[stem]

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