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HVACR317 - Refrigeration

HVACR317 - Refrigeration. Symbols 1. Standard Electrical Symbols Diagra m. Switches. Maintained Switches, Non-Return. Momentary Switches, Spring Return. Lamps With Colored Lenses. Relays and Contactors. Relays and Contactors. Have 1 load and 1 or more contacts. Control Relay .

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HVACR317 - Refrigeration

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  1. HVACR317 - Refrigeration Symbols 1

  2. Standard Electrical Symbols Diagram

  3. Switches

  4. Maintained Switches, Non-Return

  5. Momentary Switches, Spring Return

  6. Lamps With Colored Lenses

  7. Relays and Contactors

  8. Relays and Contactors • Have 1 load and 1 or more contacts

  9. Control Relay • The control relay is central to remote operation of equipment.

  10. Control Relay • Consists of two portions, the coil and the contact. The coil portion The contact portion

  11. Control Relay • The coil acts as an electromagnet.

  12. Control Relay Operation • When currents pass through the coil, magnetic flux lines build, causing a magnetic force.

  13. Relay Operation • This magnetic force attracts the contact portion of the control relay.

  14. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  15. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  16. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  17. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  18. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  19. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  20. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  21. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  22. Relay Operation • The coil of the control relay must energize before the associated contacts close.

  23. Relay Operation • The coil of the control relay must energize before the associated contacts close.

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