Troubleshooting
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Troubleshooting

Refrigerant Floodback

What To Look For:

  • • Air Cooled Compressors 
  • • Worn pistons and cylinders 
    • No evidence of overheating
  • Refrigerant Cooled Compressors 

  • • Center and rear bearings worn or seized 
    • Dragging rotor, shorted stator 
    • Progressively scored crankshaft 
    • Worn or broken ro
  •  Correction:

  • • Maintain proper evaporator and compressor superheat. 
    • Correct abnormally low load conditions. 
    • Install accumulators to stop uncontrolled liquid return.
  • Flooded Starts

    What To Look For:

  • • Worn or scored rods or bearings 
    • Rods broken from seizure 
    • Erratic wear pattern of crankshaft
  •  
  • Correction: 

  • • Locate compressor in warm ambient or install continuous pump down.
    • Check crankcase heater operation.
  •  

    Slugging 

    What To Look For:

  • • Broken reeds, rods, or crankshaft 
    • Loose or broken backer bolts
    • Blown head gaskets
  • Correction:

  • • Maintain proper evaporator and compressor superheat.
    • Correct abnormally low load conditions.
    • Install accumulators to stop uncontrolled liquid return.
    • Locate compressor in warm ambient or install continuous pump down.
  •  

    High Discharge Temperature

    What To Look For:

  • • All rods and bearings worn or scored
    • Crankshaft uniformly scored
    • Rods broken from seizure
    • Little or no oil in crankcase
  • Correction:

  •  • Correct abnormally low load conditions.
    • Correct high discharge pressure conditions.
    • Insulate suction lines.
    • Provide proper compressor cooling.
  •  

    Loss of Oil

    What To Look For

  •  • All rods and bearings worn or scored
    • Crankshaft uniformly scored
    • Rods broken from seizure
    • Little or no oil in crankcase
  • Correction:

  • • Check oil failure control operation if applicable.
    • Check system refrigerant charge.
    • Correct abnormally low load conditions or short cycling.
    • Check for incorrect pipe sizes and/or oil traps.
    • Check for inadequate defrosts.
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