Wiring Up A Honeywell CM907

[MattMunro65]

Help Please. I have removed the cover of my old mechanical thermostat, which is a Potterton PRT 100. There are 3 wires connected to it, which go into 3 pins as follows

Red Wire - Pin 1
Yellow - 2
Blue - 3

According to the diagram on the cover these are

1 = TL
2= H
3 = N


The pins on the new thermostat - Honeywell CM907 - are marked A, B, C with no indication of how this matches up to the above. The diagram with the Honeywell suggests to me that A is switched live, B is live and C is redundant (there seems to be an internal connection A to C)

I am a bit nervous about wiring it up the wrong way round so can anyone answer what I am hoping is quite a straightforward question, which colour wire goes into which numbered terminal ?

 

[denso13]

TL is A on new stat, H is B on new stat. N is neutral and not required for new stat, terminate safely (piece of terminal block).

 

[MattMunro65]

TL is A on new stat, H is B on new stat. N is neutral and not required for new stat, terminate safely (piece of terminal block).

many thanks sorted and works perfectly.