Pink wire on a sm 5205

[Dic Penderyn]

Aloha!


Any old school Heating engineers out there that can help explain the purpose of the pink wire on the SM 5205 2 port motor actuator? I have to connect it back up to a S plan configuration which was an oil boiler combined with a solid fuel system with back boiler. The oil boiler has been replaced with a Bio Mass boiler. There's are two pipe stats connected to Dunsley Baker Neutralizer and solid fuel flow pipe?

I'm presume the pink wire has something to do with a tandem connection but any examples or further explanation would be much appreciated?

I have attached a pic! Great looking bit of kit feel free to talk about it!

 

[Leesparkykent]

I think it's because the valve is SPDT and the pink wire is used as the AUX switch in the diagram or a similar application.

 

[Carlosfandango]

If it's on a neutralizer it is a specialised valve that dunsley stipulate. Not entirely sure of its function but it works in conjunction with the neutralizer system and controls the circulation pump and is controlled by the high limit stats and the cylinder stat. Google dunsley neutraliser and there are good diagrams.