The S-plan heating system is in the shape of an S when it's drawn schematically. It works by using heated water from a boiler, which is then redirected to the hot water coils, or alternatively, the radiators that help heat your home. The two separate motorised valves help to control the temperature of both the hot water and central heating.. This video covers the wiring and electrical operation of an S plan system with two 2-port valves. Wiring diagrams and further information continues below. View on Youtube. System Wiring. This diagram shows the wiring layout using the most typical components. Here, coloured wires indicate the permanent mains supply to the boiler and programmer.

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Nov 20, 2016. #4. The diagram can be used as a boiler with a pump overrun as well, you just take the pump live / neutral / Earth from the wiring center and run it to the boiler terminals. It's just a guideline on how the average boiler is wired. It can be adapted how you need it. Reply to Jamchiv01.. 14 Jan 2019. #1. Hi, I recently re-terminated my S-Plan central heating wiring into a new junction box to tidy things up and also to try to understand how it was wired originally before I moved into the property. I have created a diagram of the current wiring and even though the central heating is working (although not 100% correctly as the HW.