High Compressor Discharge Temp
refrigeration
Description
Compressor discharge temperature rises above 285.1°F (140.6°C) for 30 seconds or above 295.0°F (146.1°C); engine operation shuts down and alarms, and electric operation shuts down refrigeration and alarms with PSCON still energized.
Activation Conditions
“Check Compressor Discharge Sensor” alarm not active (if alarm is active, refer to 00125 Check Compressor Discharge Sensor first) and: discharge temp rises above 285.1°F (140.6°C) for 30 seconds, or discharge temp rises above 295.0°F (146.1°C).
Unit Behavior
Engine Operation: Shutdown and alarm. Electric Operation: Refrigeration system shutdown and alarm with PSCON still energized.
Reset Conditions
Auto Reset after 15 minutes when discharge temp falls below 266°F (130.0°C) or alarm may be manually reset via Keypad or by turning the unit off, then back on again.
Corrective Actions
1. Check Airflow Through Radiator / Condenser Coil a. Inspect condenser / radiator fins. Fins must be straight. 90% or more of the coil surface must be undamaged. No “dead” air spaces. Condenser / Radiator coil must be clean (refer to Section 8.5.11). b. Check condenser airflow. Even airflow through the entire coil, with no “dead” spots. c. Check condenser fan rotation / operation. Fans should operate correctly. Air should be drawn in through the grill, and directed into the engine compartment. 2. Check LIV, CSMV, EVXV and ECXV - Clear Active Alarm list, then run Pretrip and check for any new alarms. Any active alarms must be corrected and cleared before proceeding. 3. Check for Low Refrigerant Charge - Check refrigerant level in the receiver. Refer to Section 8.6.2. Generally, level should be between upper and lower sight glasses with a refrigerated compartment temperature of 35°F (1.0°C) or lower. 4. Check System Pressures - Install manifold gauge set and check and compare compressor discharge and suction pressures with those shown on the microprocessor display. Suction and Discharge Pressures must have the same reading on gauges and on microprocessor display. Pressures must be in the normal range for ambient and refrigerated compartment temperature conditions. 5. Check Compressor - Check compressor for excessive vibration or noise. Replace compressor. Refer to Section 8.7. 6. Check System for Noncondensable - Check refrigeration system for noncondensable gas(es). No noncondensable gas(es) may be present. Refer to Section 8.6.2.