Replace T40 honeywell by Hive

[mk26]

Hi All;
I have T40 honeywell i want to replace it by hive.
When i opened the T40 honeywell i found only 2 wires linked : Red (live) and yellow (N) and another wire colour blue but they kept it behind the wall was not linked at all and there is no other wires at all like earth wire. (Please see picture)
When I open hive i found this plan (see picture) how i can put the wires correctly to my new hive without damaging my boiler.
Thank you for tips and advice

 

[CountryFan]

Ok, its live and switched you have, not a Neutral. You have bought a Hive dual channel, what system do you have?

 

[mk26]

I have boiler with combine system heater and tap hot water

 

[CountryFan]

I have boiler with combine system heater and tap hot water

So a combi boiler?

 

[ericmark]

The old thermostat did not NEED a neutral, they would work often better with one, but will also work without one, it would also switch 24 volts just as easy as 230 volts, so you have no idea as it stands what it is switching. There is it seems a triple and earth cable, as the standard colours were red, yellow, blue and bare, so there may be a neutral, but step one is to get the meter out and test.

Hive single channel will work with volt free contacts, so could work with 24 volts control, but it seems you have the two channel version, which will only work with 230 volts control.

But the whole idea of Hive, Wiser etc, is the control can be wireless connected to some base. So the base, hub, or what ever name they give it, can be at the boilers' location. The hard-wiring to sensing location is no longer required.

Step one is to get the boilers manual, then see if one can access the wiring without being gas-safe, then see what the options are, could be 230 volts, 24 volts or 0–48 volts (open therm) depending on the boiler.

My own Worcester Bosch is oil fired, and 230 volt control. And the hard-wiring went to the hall, which was not really a good location, hall cools down too slowly, and I found one thermostat was not really working, so went to Wiser, and now have three linked thermostats, and 9 stand-alone thermostats (TRVs). And two are wireless, and one, the original Nest Gen 3 is hard-wired. The Nest Gen 3 also controls the water, which is why it was left connected.

You need to decide what you want, I use Wiser which is similar to Hive, with my Wiser there is no need for a wall thermostat if you don't want it.