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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

HVACR317 - Refrigeration

Motor Application

Compressor Motors

hermetic compressors
Hermetic Compressors
  • Cannot be serviced
hermetic compressors1
Hermetic Compressors
  • May have current relays for motor starting.
hermetic compressors2
Hermetic Compressors
  • Current relays close on high amps, open on low amps.
motor current profile 1
Motor Current Profile 1

MOTOR STARTS

MOTOR SPEED INCREASE

MOTOR AT SPEED

AMPSAPPLIED

motor current profile 3
Motor Current Profile 3

Once the motor is started, the amps level off to FLA (Full Load Amps).

hermetic compressor wiring
Hermetic Compressor Wiring
  • With Current Relays
potential relays
Potential Relays
  • Used to start electric motors
potential relay operation 1
Potential Relay Operation 1

CURRENT FILLS THE START CAPACITOR AT STARTUP

potential relay operation 2
Potential Relay Operation 2

CURRENT FILLS THE START CAPACITOR AT STARTUP

hard to start motors
Hard to Start Motors
  • Use a “hard-start kit.”
measuring current
Measuring Current
  • With a clamp on ammeter:
measuring current1
Measuring Current
  • With a clamp-on ammeter:
resistance measurements
Resistance Measurements
  • Across Motor Windings: