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Electrical Wiring Diagram Symbols Flashcards

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Electrical Wiring Diagram Symbols commonly found in HVAC wiring diagrams

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9354124448High Voltage, Factory Wired0
9354124449Low Voltage, Factory Wired1
9354124450High Voltage, Field Wired2
9354124451Low Voltage, Field Wired3
9354124452High Pressure Switch Normally Closed Opens on increase (rise)/Closes on decrease (drop) (vacuum & pressure activated)4
9354124453Low Pressure Switch Normally Open Closes on increase (rise)/Opens on decrease (drop) (vacuum & pressure activated)5
9354124454Cooling Thermostat Normally Open Closes on increase (rise)/Opens on decrease (drop) (temperature activated)6
9354124455Heating Thermostat Normally Closed Opens on increase (rise)/Closes on decrease (drop) (temperature activated)7
9354124456High Liquid Level Switch Normally Closed Opens on increase (rise)/Closes on decrease (drop) (liquid level activated)8
9354124457Low Liquid Level Switch Normally Open Closes on increase (rise)/Opens on decrease (drop) (Liquid Level activated)9
9354124458Flow Switch (positive) Normally Open Closes on flow or movement (air, water, liquid flow or movement)10
9354124459Flow Switch (negative) Normally Closed Opens on flow or movement (air, water, liquid flow or movement)11
9354124460Normally Open Contacts12
9354124461Normally Closed Contacts13
9354124462Disconnect Switch14
9354124474Single Pole Single Throw Switch15
9354124475Single Pole Double Throw Switch16
9354124476Single Pole Double Throw 3 Position Switch17
9354124478Push Button Normally Open Single Circuit Momentary, Spring Return18
9354124479Push Button Normally Closed Single Circuit Momentary, Spring Return19
9354124480Momentary Push Button Double Circuit Momentary, Spring Return20
9354124486Fixed Resistor Glow Coil Strip Heater21
9354124491Transformer (variants)22
9354124492Capacitor23
9354124493Relay Coil24
9354124494Fuse25
9354124495Fusible Link26
9354124496Ground Connection27
9354124497Light28
9354124500Thermal Overload29
9354124501Bi-Metal Switch30
9354124504Crank Case Heater31
9354124505Meter * denotes type32
9354124511Electrically Operated Switch * Indicates magnetic coil,motor, or thermal element33
9354124522Motor Single Phase 2 Lead34
9354124523Motor Single Phase 3 Lead35
9354124526Bi-Metallic Thermal Overload36
9354124531Horn or Siren37
9354124532Buzzer or Bell38
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