What Causes High Compressor Discharge Temperature?
The compressor's discharge temperature is often an overlooked temperature when troubleshooting a refrigeration or air conditioning system. However, it is very important because it's an indication of the amount of heat absorbed in the evaporator and suction line, and any heat of compression generated by the compression process.
Because the compressor's discharge temperature is superheated, a pressure-temperature relationship does not exist and it must be read directly on the discharge line by some sort of temperature-measuring device.