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Causes for high compressor discharge temperature

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Good day,
If it's an R134A system, it could well be a restriction internally in the refrigeration system.

That's based on the assumption that the condenser cooling motor is running and running at speed,
the condenser coils are clean and the backing cover is in place since that ducts the air thru the condenser properly.

Last possibility is the system was overcharged.

Posted on Oct 12, 2010

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A/C Pressure Cutoff Switch

The A/C pressure cutoff switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
  • The A/C pressure cutoff switch is mounted on a Schrader valve-type fitting on the A/C compressor to condenser discharge line.
  • It is not necessary to discharge the refrigerant system to remove the A/C pressure cutoff switch.
  • A valve depressor, located inside the threaded end of the A/C pressure cutoff switch, presses on the Schrader valve stem.
  • This allows the A/C pressure cutoff switch to monitor the compressor discharge pressure.
  • When the compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C compressor. For specifications regarding operating pressure(s), refer to Section 412-00 .
The switch contains a second set of electrical contacts used for high-speed cooling fan control.
  • When the compressor discharge pressure rises, the contacts close and engage the high-speed fan control. When the pressure drops, the contacts open and the high speed fan control is disengaged. For additional information, refer to Section 303-03 .

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