Replacing thermostat with Hive

[Jason Smalley]

Hi

Trying to replace a Danfoss system with Hive but wiring doesn’t seem to correspond - taking the plate off, there’s 4 neutrals, 2 lives, nothing in 1 or 2, 3 and 4 are wired (as are 5 and 6 which is the remote thermostat)

Looking for ideas on how to wire up!

Thanks!

Jason

 

[stem]

Err, isn't there a black wire in terminal 4?

 

[Jason Smalley]

Yeah there is - there’s none in 1 and 2 and we have a tank, not a combi

 

[stem]

OK, but you did say.

nothing in 1 or 2, 3 and 4 are wired

What model of Danfoss are we talking about there are many different versions and they don't use the same terminals for the same thing.

 

[Jason Smalley]

Sorry my bad, thanks for your help - TP9000

 

[stem]

Thanks, so your unit connections are as below:



...and as you rightly say it is capable of controlling the hot water timing too, except it isn't connected. The TP9000 is only wired up to control the heating.

So if you have a hot water cylinder, then something else must be controlling the hot water. Unless (and it would be unusual if this were the case) the hot water cylinder is only heated by an electric immersion heater.

Where do you set the hot water on / off times?

 

[Jason Smalley]

At that controller, the one upstairs only does the heating upstairs (house is zoned which makes it even stranger) - we do have an immersion heater, but never use it.

It’s strange, I put the hot water on from that controller and the boiler defo fires

 

[Jason Smalley]

Ah wait - just found this in the boiler book for our megaflow which would suggest 1 and 2 are not in use

 

[stem]

In the UK, 2 is never used and 1 only sometimes, depending upon the system.

The Megaflow diagram does show a connection to 3 & 4 though, which is what I would expect. Are you sure there isn't also a wire in 3? It's difficult to see in the photo.

 

[Jason Smalley]

Yeah I’ve just seen your other thread, I’ve essentially ignored 1 and 2 and just wired into 3 and 4 and it’s working fine

Thanks very much for your help

So

Neutral
Live
1 (empty)
2 (empty)
3
4
Blocked off 5 and 6

Thanks again

 

[stem]

Great, thanks for the update. Glad to hear it's working