Install wireless cm900 roomstat to this system

[ize101]

Hi everyone im bob pleased to meet you all
Recently moved into house which has combi boiler (biasi m90f 24s) for hot water / heat.
There is no room stat and I'd like to have one. This would need to be wireless honeywell CM900 - would then leave heating control to permanently on and control heating via stat.

How would I install it? I've posted some pics of the system as it is at the moment -
There is a mains feed in the airing cupboard for the reciever which i can suss out, but where would I wire the control to?
All suggestions gratefully recieved. - PHOTOS BELOW

Untitled

• ize101
• 3 Oct 2012
• 2

Untitled

• ize101
• 3 Oct 2012
• 1

 

[D_Hailsham]

You need a 4-core heat resistant cable. You may have to buy 4 core plus earth. Do not use 3 core plus earth.

Connect as follows:

Boiler --------Wire------------ Honeywell

Top Connector
Left (L)-------Brown--------------- L
Centre (E)------------------- Not used
Right (N) -----Blue-----------------N

Bottom Connector
Left ----------3rd colour-----------A
Right ---------4th colour-----------B

Remove link between left and right terminals.

Make sure that you get good communication between the controller and receiver when in proposed locations before fixing the receiver to the wall. This is easiest done by connecting a fly lead to the L and N terminals on the receiver with a 3 pin plug on the other end.

 

[ize101]

Thanks for the detailed wire guide and wire advice.ill grab some four plus earth.
thanks again