I have a SIEMENS RWB9 central heating programmer. I am wanting to know the wiring layout for the connection to my central heating system. I have a 3 amp spur, the programmer, an oil boiler and a pump. Basically looking for an idiot's guide as to how these should be wired i.e. does the spur connect to the programmer, the programmer to the boiler and the boiler to the pump ? Any advice much appreciated

colin davis, September 2016

Mains power goes from the fused spur to a junction box or wiring centre (center)

From there to the programmer - room stat and cylinder stat - the diverter valve and the boiler.

The boiler electronics feed the circulating pump and allow for pump over-run.

All of this depends on the specifics of the boiler and its associated components.

Do not attempt this at home.

Stay safe..., September 2016

It is called the installation manuals for whatever make of boiler, ptogrammer etc you have. You also need to understand what you are doing and be competent. You clearly fail on the last two and the fact that you have had to ask here instead of looking for themanuals suggests you don't have a hope in hell of doing the job safely.

Get someone competent to do the job, September 2016