On Thu, 25 Mar 2004 16:40:32 -0000, in uk.d-i-y you wrote:

"Nick Brooks" wrote in message
...

Hi Nick

I suggest you unscrew the existing thermostat and peek inside, how many
wires have you actually got in there?

I looked inside the drayton and this is what was inside

Blue wire to N
Red wire to L
Earth (green & yellow) to earth
Yellow wire to a terminal numbered 3

Secondly, what controls when your heating comes on at present as you may
need to consider how it will interact with the CM67?

The boiler has a timer on it but I understand that doesn't matter I just
switch it over from timer to to constant and let the thermostat control it.

Likely OK if you have a fully pumped system. If you have gravity H/W
circulation then you may end up with the boiler on all the time (i.e.
heating H/W). Floor standing boilers sometimes have gravity H/W
circulation. I dont think that wall mounted boilers ever use gravity
circultaion.

Michael Chare