Central Heating Wiring Diagrams
Central Heating Diagrams
Electrical tests
Central Heating Wiring Diagrams
Fuses
Electrical Circuits
Wires and Cables
Earth Bonding
Room Thermostat
Cylinder Thermostat
2-port Motorised Valve with Auxiliary Switch
Wiring Diagram Heating Only
Wiring Diagram Hot Water Only
Frost Thermostat
Frost & Pipe Thermostat (2 port valve)
Frost & Pipe Thermostat (Mid position valve)
S-plan Vaillant ecoTec Wirning Diagram
Y-plan Vaillant ecoTec Wirning Diagram
Full Wiring Diagram (2x2 port valve)
Full Wiring Diagram (3 port mid position valve)
- Room stat off and Cylinder stat off
- Mid position valve opens hot water B by default
- No power to boiler and pump
- Room stat on and Cylinder stat off
- Mid position valve opens central heating A
- and energises orange wire to run the boiler and the pump
- Room stat off and Cylinder stat on
- Mid position valve opens hot water B by default
- Cylinder stat energises the boiler and pump
- Room stat on and Cylinder stat on
- Mid position valve will move to the centre AB position
- Cylinder stat energises the boiler and pump
- White wire will hold the valve in the mid position
Two-channel Programmer
