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- 14:07, 10 June 2026 Morgan Allen talk contribs created page Y-Plan Wiring Reference Pack (Created page with "= Y-Plan Heating System Wiring Reference = == Overview == Y-Plan systems use a single 3-port motorised valve to control heating and hot water from one boiler. == Main Components == * Boiler (with heating demand input) * Programmer / timer * Room thermostat * Cylinder thermostat * 3-port motorised valve (mid-position valve) * Pump (usually external or boiler-integrated) * Junction box (commonly wiring centre) --- == System Operation == * Heating and hot water are cont...")