Y-plan - mid-position diverter valve 

In this video you will be shown an easy to read wiring diagram for a heating system using a 3-port mid-position valve. I'll explain how I wire the system and how to trace wires in a junction-box for fault-finding. I then show the system in practice and put it to the test. There are issues with 3-port valves which sometimes cause problems; these are mentioned and will be looked at in more detail in another video - • Mid-Position Valve - H...