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HVACR214 – Electrical for Oil

HVACR214 – Electrical for Oil. Lesson 3 – Electrical for Oil. Circuit. An electrical circuit is a full path for electricity. A circuit must consist of 4 parts Source Switch Path Load. Source. A source for a circuit can be A battery A transformer (more on that later)

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HVACR214 – Electrical for Oil

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  1. HVACR214 – Electrical for Oil Lesson 3 – Electrical for Oil

  2. Circuit • An electrical circuit is a full path for electricity. • A circuit must consist of 4 parts • Source • Switch • Path • Load

  3. Source • A source for a circuit can be • A battery • A transformer (more on that later) • A wall electrical outlet • A power line • A breaker panel • A power plant

  4. Path • A path for an electrical circuit could be • A wire • A circuit board • A piece of grounding strap • A path must have a very low resistance, this allows electrons to move freely and without heat. • A path with a high resistance will heat up.

  5. Switch • A switch is basically a valve or gate that stops the free flow of electrons. • It does this by opening the path. • Now we add two more terms: • Open - A gap (or opening) in the path of a circuit that stops the flow of electrons. • Closed - A path that is complete that allows the flow of electrons.

  6. Load • The portion of an electrical circuit that actually does the work. • This can be • A light bulb - the work is creating heat and light • A motor - the work is turning the shaft. • A heat strip - the work is putting off heat. • A coil - the work is creating a magnetic field.

  7. Picture of a circuit • Pictures of circuits are called Schematic Diagrams. • These diagrams are composed of symbols that represent each part of the circuit. • These symbols are called schematic symbols.

  8. Schematic of a basic circuit N L1 SW1 B1

  9. Schematic of a switch Single Pole - Single Throw Switch Single Pole - Double Throw Switch

  10. Poles and Throw Throw Pole Single Pole - Double Throw Switch

  11. Source on a schematic • Can be labeled L1, L2, N, or anything else. • It is usually at one side of the schematic and everything else works from there.

  12. Loads on a schematic • Loads are shown by either an actual schematic symbol for the load or by a circle with a letter and a key. • Loads are the portion of the circuit that does the work.

  13. A more complex schematic

  14. Shop Safety • Make sure everything you are working with is unplugged and turned off when you are starting your assignment. • Use black wire for line voltage source • Use white wire for line voltage neutral • Use red wire for control voltage source • Use orange wire for control voltage common (neutral)

  15. Shop Safety • Your instructor must check all circuits before you power it up. That means before you plug it in and turn it on the instructor must check it. • Make sure the instructor initials your lab sheet.

  16. First shop project • You are going to build a basic circuit. • Starting on page 13 of your electrical handout you will follow the step by step procedures. • Make sure you ask if you need help or have any questions. • Everyone in the class is expected to wire and complete this assignment.

  17. Shop Circuit #1 N 120V SS SW1 B1

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