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S plan this scheme uses separate two port valves one for hot water and another for heating it can be easily extended to include additional heating zones by adding an extra valve and room thermostat for each zone this is typically called s plan plus. S plan or splan plus are fully pumped central heating systems using individual motorized zone valves to control domestic hot water and heating the wiring connections of splan heating systems may at first appear complicated because they use more than one motorized valve. Contains all the essential wiring diagrams across our range of heating controls click the icon or the document title to download the pdf downloads faq v4073a mid position y plan valve operation how a mid position valve operates within a sundial y plan heating system faq wiring diagram s plan plus pump overrun st9400 and dt92e faq . The diagram set includes wiring plans for a number of popular configurations of central heating systems c plan w plan y plan s plan s plan etc and you should select the most appropriate diagram that matches the components you have installed in your system along with what youre hoping to achieve in terms of controllability. Central heating wiring diagram s plan hd dump me throughout tom hardiman diy what others are saying wiring diagram for a y plan heating system y plan wiring diagram alloff on motorised valve for motorised valve wiring diagram see more new perkins generator wiring diagram diagram diagramsample diagramformat