trying to change a broken programmer on a thorn apollo to a drayton lp112, just cannot work out which wires are for hw on and hw off, had a spark round looking at the wiring diagram and he's stumped aswell. Diagram shows N - L - HW - CH -CH(off), These all go to the conections for the current clock but nothing for HW off

Any ideas ??????????????????

mark, February 2010

I have no skills or experience - an unqualified muppet...

From this pdf... Page two...

http://www.heatweb.com/pdf/Invensys/Programmer%20Compatibility%20Chary.pdf

Drayton Lifestyle LP112 terminals

Neutral
Live
1) H/W Off
2) C/H Off
3) H/W On
4) C/H On

In this diagram...

http://www.gasheating.co.uk/Mid-Position-Valve.html

H/W off goes to the cyclinder stat and from there to the Mid Position Valve on the Grey wire

Good luck...

Peccavi, February 2010