2 HVAC WiringWiring diagrams are road maps for electron flow
3 HVAC Wiring HVAC Technicians must know: How to draw them How to read them
4 HVAC WiringDrawing diagramsBegin with a description of how the circuit is too workDraw a diagram a main single pole/single throw switch that controls all loads. A single pole/single throw switch controlling a 60w bulb. A single pole/single throw switch controlling two 40w bulbs connected in parallel. A single pole/double throw switch controlling a 40w bulb in one position and two 60w bulbs wired in series controlled when the single pole/double throw switch is in the other position.
5 HVAC WiringDrawing diagramsNext Create a Written flow chart
6 HVAC Wiring Drawing diagrams Use the flow chart to complete a Ladder DiagramPlace the switch that controls everything of L1
7 HVAC Wiring Drawing diagrams Using the flow chart add a circuit that add a branch circuitPlace a spst switch in series with a 60w bulb
8 HVAC Wiring Drawing diagrams Use the flow chart to complete a Ladder DiagramNow place the next switch in the circuit
9 HVAC Wiring Drawing diagrams Use the flow chart to complete a Ladder DiagramPlace the bulbs controlled by the switch in the circuit
10 HVAC Wiring Drawing diagrams Use the flow chart to complete a Ladder DiagramComplete the ladder with the last circuit
11 HVAC Wiring Drawing diagrams Use the Ladder Diagram to wire the project boardWire one branch at a time
12 HVAC Wiring Drawing diagrams Note how since L1 power has been brought to SW1 that is where we can pick up power for the next switch
13 HVAC Wiring Drawing diagrams Note how since N or L2 has been brought to Bulb 1 we use any terminal that has a direct line back to N/L2 as a connection to N/L2
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