Replacement Zone Valve

[james.logan40]

I am replacing a CH Zone (2 port) valve.

New Valve (Horstmann)

Blue = Neutral, Brown = "Call" terminal of room stat, Orange = Live terminal pump & boiler, Grey = Live Supply, Green = Earth

Old Valve (Tower Heating Components)

Blue = Mains neutral, Brown = Mains Live, Green = Earth, Grey = ES? and appears to be the common of a switch, White is another connection on the switch, and orange is the other connection on the switch

Wires are very difficult to trace and colours vary. Can anyone help with what should connect to what please.

Thanks

Jim

[Andy Cap]

Colour for colour by the look of it. The white ( contact normal ) is not used in your particular application.

Andy