Hive heating and hot water to replace Honeywell CM907 Timer/programmer and Drayton LP111

[Phil H77]

Hi

Have just purchased a Hive Active heating kit (heating and hot water). I've been browsing the forums and can't find anything relating to my current setup, so hence this new thread.

My current system is a Worcester Bosch Greenstar Ri bolier (conventional not combi) so I have a hot water tank, cold water tank and a small expansion tank in the loft. This is an S plan system. A Room stat/programmer - Honeywell CM907 which controls the heating and a Drayton Lifestyle LP111 Timer/programmer which controls hot water only.

I know the Hive receiver should be a direct replacement for the LP111 as the backplates are identical, but there is no connection currently from this to call for heat, there is also a live link on the backplate which I believe I don't need for the Hive as it's internal.

My question is, where do I connect the Heating terminal (I believe terminal 4 on the backplate) into my wiring centre?

I've included details of the current wiring centre connections along with pictures of the existing backplate for the LP111 and the connections into my Honewell CM907. The wiring centre is something of a rats nest which I believe is not uncommon, but I've managed to identify the various connections by following the wiring back to the individual components.

Any assistance greatly appreciated.

 

[ianmcd]

The yellow in the room stat is not a Neutral, the room stat does not have a neutral it is battery powered

 

[Phil H77]

Thanks, yes I realise that I just took this from the wiring diagram on the inside of the stat.

 

[ianmcd]

Thanks, yes I realise that I just took this from the wiring diagram on the inside of the stat.

The N on that diagram means that the switched live goes to the load, be it boiler or pump or MV or whatever that has a Neutral and completes the circuit

 

[Phil H77]

Thanks. So having been looking at the wiring and tracing the connections in the wiring centre, it looks as if I can connect terminal 4 on the Hive backplate to the Heat valve motor in terminal 5 wiring centre, and the Hive will then energise the valve when it receives a command from the room stat, and activate the valve, The wiring to the existing programmer/room stat would then be redundant (terminals 4 and 6) and can be disconnected.