High Comp Discharge Temp
refrigeration
Description
High compressor discharge temperature means discharge temperature stays above the listed limit for three minutes or exceeds 350b0F (176.7b0C), and the unit shuts down and alarms.
Activation Conditions
Alarm 00125 Check Comp Discharge Sensor is not active AND: Ambient temperature is below 120°F (48.9°C) and discharge temperature is greater than 309°F (154.4°C) for three minutes, or ambient temperature is above 120°F (48.9°C) and discharge temperature is greater than 340°F (171.1°C) for three minutes, or discharge temperature exceeded 350°F (176.7°C).
Unit Behavior
Shutdown and alarm.
Reset Conditions
Auto Reset after 15 minutes with the ambient temperature below 120°F (48.9°C), when the discharge temperature falls below 300°F (148.8°C); or auto reset after 15 minutes with the ambient temperature above 120°F (48.9°C) when the discharge temperature falls below 330°F (165.4°C); or alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. If Alarm Occurs During Pretrip Test 14 (Pretrip descriptions can be found in Section 1.6): Check compressor by performing a compressor test. Refer to Section 1.8.1. 2. Check Airflow Through Radiator and Condenser Coil a. Inspect condenser and radiator. Ninety percent or more of the coil surface must be undamaged. Condenser/Radiator coil must be clean. b. Check airflow (with unit running). Even airflow through the entire coil. No “dead” spots. c. Check upper and lower fan belt tension and condition. Verify no glazing, no cracking, and no slipping. Refer to Section 1.6. Replace if required. 3. Check Refrigerant Charge: Refer to Section 1.7.2. 4. Check System Pressures: Install a manifold gauge set to check and compare actual compressor discharge and suction pressures with those shown in Unit Data. Refer to Section 1.9.12 for instruction on comparison. 5. Check Compressor Discharge Sensor (CDT): Refer to procedure for alarm 00125 Check Comp Discharge Sensor. Alarm condition must be corrected and the alarm cleared to continue. 6. If alarm occurred during Defrost, check DTT a. Visually inspect the mounting of DTT. Must be mounted tightly to the tube sheet, with the center screw properly torqued. Ensure sensing side is in contact with the tube sheet. Refer to Figure 1.3. b. Using a service (test) thermometer check temperature of evaporator tube sheet at DTT location and compare actual temperature to the Unit Data reading. Must be within ±2°F (1°C). 7. Perform Pretrip Check: Clear Active Alarm list, then run Pretrip and check for any new alarms. Any active alarms must be corrected and cleared before proceeding. 8. Check System For Non-Condensables: Check refrigeration system for non-condensable gas(es). No non-condensable gas(es) may be present. Refer to Section 1.7.2. 9. Check Compressor Cylinder Valves and Gaskets: Remove compressor heads and inspect condition of cylinder suction valves, cylinder discharge valves and gaskets. Must be in good condition. Install new parts and gaskets as required. Refer to Section 1.8.