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Understanding Control Relays and Essential HVACR Symbols

This guide covers the fundamental concepts of control relays in HVACR systems, emphasizing the importance of coil energization before contact closure. It details various types of contacts such as SPST, SPDT, DPST, and DPDT. Additionally, it explores the role of electromagnetic devices, solenoids, and motor starters with their wiring diagrams. Learn about overload protection, capacitors, transformers, and other crucial components in refrigeration systems. This essential information helps technicians ensure safe and efficient operation of HVACR systems.

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Understanding Control Relays and Essential HVACR Symbols

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  1. HVACR317 - Refrigeration Symbols 2

  2. Control Relay • The coil of the control relay must energize before the associated contacts close.

  3. Control Relay • The coil of the control relay must energize before the associated contacts close.

  4. Control Relay • The coil of the control relay must energize before the associated contacts close.

  5. Contacts Contacts: SPST - Single Pole Single Throw SPDT - Single Pole Double Throw DPST - Double Pole Single Throw DPDT - Double Pole Double Throw

  6. Electromagnetic Devices and Solenoids Electromagnetic Devices Solenoids

  7. Switch and Wiring Diagram Overload protection MotorStarter

  8. Switches Diagram Motor Starter OverloadProtection

  9. Motor Starter Overload Components

  10. Motor Starter

  11. Electric Resistance Heaters Electrical Energy Converts to Heat

  12. Transformers Converts VAC to VAC

  13. Primary and Secondary Windings

  14. Fuses (Overload Protection Devices) Protection up to Fuse Rating

  15. Fused Disconnect

  16. Capacitors Rated in Farads

  17. Compressor Wiring Diagrams

  18. Compressor Wiring Diagram Current Relay

  19. Compressor Wiring Diagram Current Relay

  20. PSC Motor • Permanent Start Capacitor

  21. Thermostats

  22. Simple Gas Furnace

  23. Main Gas Valve Coils act as electromagnets

  24. Over Temperature Limit Switches

  25. Low Pressure Control Switch System pressure acts on diaphragm

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