Our Wiring Diagrams section details a selection of key wiring diagrams focused around typical Sundial S and Y Plans.

Heating Controls Wiring Guide Issue 17

V4073A Y Plan - How a mid position Valve operates within a Y Plan Heating System

How a W Plan heating system operates

FAQ-Pump-Overrun-Wiring-Diagrams-for-S-Plan-incorporating-a-ST9400-Programmer

FAQ-Pump-Overrun-Wiring-Diagrams-for-S-Plan-Plus-incorporating-separate-diagrams-with-ST9100-Time-Switch-and-ST9400-Programmer

FAQ-Pump-Overrun-Wiring-Diagrams-for-S-Plan-incorporating-a-ST9400-Programmer

FAQ-Pump-Overrun-Wiring-Diagrams-for-Y-Plan-incorporating-a-ST9400-Programmer

FAQ-T4360B-Frost-Protection-Kit---Details-how-to-operate-a-Frost-Protection-Kit

FAQ-T6360-Room-Thermostat-Wiring-&-Operation

FAQ-Wiring-Diagram-S-Plan-Pump-Overrun-(ST9400-and-DT92E)

FAQ-Wiring-Diagram-S-Plan-Plus-Pump-Overrun-(ST9420-and-DT92E)

FAQ-Wiring-Diagram-S-Plan-Plus-Pump-Overrun-(ST9400-and-DT92E)

FAQ-Wiring-Diagram-S-Plan-Plus-Pump-Overrun-(ST9420-and-DT92E)

FAQ-Wiring-Diagram-Y-Plan-Pump-Overrun-(ST9400-and-DT92E)

FAQ-Wiring-Diagram-Y-Plan-Pump-Overrun-(ST9420-and-DT92E)

FAQ-Wiring-Diagram-Combination-Boiler-(ST9120)

T6 and T4-Additional-Wiring-Diagrams 04-20

V4043-Zone-Valve-S-Plan-Operation