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HVACR Core Essentials: Relay Control and Motor Starters in Refrigeration Systems

This comprehensive guide covers essential topics such as the energizing sequence of control relays, contact types, electromagnetic devices, overload protection, motor starters, electrical energy conversion, and components like transformers, capacitors, and compressors. It also includes wiring diagrams, thermostat functions, gas furnace operation, and system pressure controls for refrigeration applications.

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HVACR Core Essentials: Relay Control and Motor Starters in Refrigeration Systems

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  1. HVACR317 – Core for Refrigeration Symbols 2

  2. THE COIL OF THE CONTROL RELAY MUST ENERGIZE FIRST BEFORE THE ASSOCIATED CONTACTS CLOSE

  3. THE COIL OF THE CONTROL RELAY MUST ENERGIZE FIRST BEFORE THE ASSOCIATED CONTACTS CLOSE

  4. THE COIL OF THE CONTROL RELAY MUST ENERGIZE FIRST BEFORE THE ASSOCIATED CONTACTS CLOSE

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

  6. ELECTRO-MAGNETIC DEVICES SOLENOIDS

  7. OVERLOAD PROTECTION MOTOR STARTER

  8. MOTOR STARTER M1 L1 T1 L1 L2 T2 L2 L3 T3 L3 OVERLOAD PROTECTION M1 OL OL OL 2 3

  9. OVERLOAD HEATERS OVERLOAD CONTACTS MOTOR STARTER OVERLOAD COMPONENTS

  10. MOTOR STARTER M1 L1 T1 L1 L2 T2 L2 L3 T3 L3 M1 OL OL OL 2 3

  11. ELECTRICAL ENERGY CONVERTS TO HEAT ELECTRIC RESISTANCE HEATERS

  12. CONVERTS VAC to VAC TRANSFORMERS

  13. L1 N S-1 R

  14. PROTECTION UP TO FUSE RATING FUSES (OVERLOAD PROTECTION DEVICES

  15. FUSED DISCONNECT

  16. RATED IN FARADS CAPACITORS

  17. COMPRESSOR WIRING DIAGRAMS

  18. CURRENT RELAY COMPRESSOR WIRING DIAGRAM

  19. CURRENT RELAY Cut-In Amps Cut-Out Amps AMPS COMPRESSOR WIRING DIAGRAM TIME

  20. PSC MOTOR PERMANENT START CAPACITOR

  21. CLOSES ON TEMP FALL HEATING THERMOSTAT CLOSES ON TEMP RISE COOLING THERMOSTAT THERMOSTATS

  22. SIMPLE GAS FURNACE

  23. COILS ACT AS ELECTRO-MAGNETS MAIN GAS VALVE

  24. OVER TEMPERATURE LIMIT SWITCHES

  25. SYSTEM PRESSURE ACTS ON DIAPHRAGM LOW PRESSURE CONTROL SWITCH

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