3 Port Valve Wiring Query

15 Jan 2008
Reaction score
United Kingdom
What is the purpose of sending 240v to terminal 2 of the cylinder stat when using a 3 port valve?
The valve is getting its 240v direct from the programmer HW off so what is the reason for sending it to the cylinder stat too?

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When the tank is hot the 3 port valve needs two live wires to divert
fully across to central heating only.
The live at the cylinder off position is sent to the 3 port when then cylinder is hot to get it to divert fully to central heating only.

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