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Electrical Supply and Earth Continuity

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Central Heating Wiring Diagrams

Central Heating Diagrams

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Electrical tests

Testing Equipment

Types of Electrical Tests

Central Heating Wiring Diagrams

Central Heating Diagrams

Electrical Current

Types of Electrical Systems

Fuses

Fuse Types

Safety Requirements

Wires and Cables

Cable Protection

Cable Sizing

Cable Types

Electrical Circuits

Electrical Bathroom Zones

Electrical Components

Electrical Fittings

Switches and Sockets

Types

Earth Bonding

Earth Bonding

Room Thermostat

Room Thermostat Wiring

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Cylinder Thermostat

Cylinder Thermostat Wiring

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2-port Motorised Valve with Auxiliary Switch

2-port Motorised Valve with Auxiliary Switch

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Wiring Diagram Heating Only

Two-port motorised valve (heating)

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Wiring Diagram Hot Water Only

Two-port motorised valve (hot-water)

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Frost Thermostat

Frost Thermostat Wiring

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Frost & Pipe Thermostat (2 port valve)

Frost & Pipe Thermostat (2 port valve)

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Frost & Pipe Thermostat (Mid position valve)

Frost & Pipe Thermostat (Mid position valve)

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S-plan Vaillant ecoTec Wirning Diagram

S-plan Vaillant ecoTec pro Wirning Diagram

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Y-plan Vaillant ecoTec Wirning Diagram

Y-plan vaillant ecotec wiring diagram

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Full Wiring Diagram (2x2 port valve)

full central heating wiring diagram using 2x2 port zone valves

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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
Central heating wiring diagram using 3 port mid position valve
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Two-channel Programmer


Two-channel Programmer
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