Wiring a CM927 to a Vaillant Ecomax

[Chestercopperpot]

Can somebody give me information on how this is wired.
Keeping in mind i've never done this before but i'm always up for giving something a bash

Honeywell told me i shouldnt do it if im not experienced but i really dont want to have to pay someone else, it cant be that hard.

Cheers

 

[Chestercopperpot]

Anybody?

 

[D_Hailsham]

Anybody?

Patience!!

DO you have an installation manual? If not it's Here.

On page 18, fig 4.16 there is a wiring diagram. The bit you are interested in is at the bottom, a strip of 14 connectors marked "contact-therm 7, 8, 9, L, N etc. Terminals 3 and 4 are the thermostat connection.

You need a four core plus earth (not used) heat resistant cable (eg tower brand from B&Q).

Connect the L and N terminals of the 927 receiver to the L and N terminals of the boiler, using brown and blue wires. Connect the A and B terminals of the CM927 to terminals 3 and 4 of the boiler (remove the link between 3 and 4).

Job done

PS make sure that the receiver is at least 30cm away from the boiler and any metal boxes, electrical sockets etc.

It's a good idea to check that the two parts of the CM927 will communicate reliably before fixing the receiver in place. This is easily done by fixing a fly lead to the L and N terminals with a 3-pin plug on the other end.

 

[Chestercopperpot]

You are a true legend

Thank you xx

 

[Chestercopperpot]

You need a four core plus earth (not used) heat resistant cable (eg tower brand from B&Q).

Any chance you can link me to this.
Cant find it

 

[londonboy]

You can get that anywhere, ask in an electrical whole salers for 5 core flex.

Or search google

 

[D_Hailsham]

Any chance you can link me to this. Can't find it

Link

You will probably get it much cheaper at an Electrical wholesalers, who will cut it to length.