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HVACR317 - Refrigeration

HVACR317 - Refrigeration. Motor Application Compressor Motors. Hermetic Compressors. Cannot be serviced. Hermetic Compressor Cross Section. Hermetic Compressors. May have current relays for motor starting. Hermetic Compressors. Current relays close on high amps, open on low amps.

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HVACR317 - Refrigeration

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  1. HVACR317 - Refrigeration Motor Application Compressor Motors

  2. Hermetic Compressors • Cannot be serviced

  3. Hermetic Compressor Cross Section

  4. Hermetic Compressors • May have current relays for motor starting.

  5. Hermetic Compressors • Current relays close on high amps, open on low amps.

  6. Motor Current Profile 1 MOTOR STARTS MOTOR SPEED INCREASE MOTOR AT SPEED AMPSAPPLIED

  7. Motor Current Profile 2

  8. Motor Current Profile 3 Once the motor is started, the amps level off to FLA (Full Load Amps).

  9. Hermetic Compressor Wiring • With Current Relays

  10. Hermetic Compressor With Capacitor

  11. Potential Relays • Used to start electric motors

  12. Potential Relay Application

  13. Potential Relay Operation 1 CURRENT FILLS THE START CAPACITOR AT STARTUP

  14. Potential Relay Operation 2 CURRENT FILLS THE START CAPACITOR AT STARTUP

  15. Potential Relay Operation 3

  16. Potential Relay Operation 4

  17. Hard to Start Motors • Use a “hard-start kit.”

  18. CSCR Motor

  19. Measuring Current • With a clamp on ammeter:

  20. Measuring Current • With a clamp-on ammeter:

  21. Measuring Resistance With a Multimeter

  22. Resistance Measurements • Across Motor Windings:

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