62-11785 7–12
00024 COMPRESSION RATIO EXCEEDED
• ACTIVATION: If the compressor compression ratio is greater than 24 for 20 seconds.
• UNIT CONTROL: Refrigeration system shutdown and alarm with PSCON still energized.
• RESET CONDITION: Auto reset when compression ratio is less than 24 for 3 minutes or, alarm may be
manually reset via keypad or by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, the active
alarm should clear itself (refer to reset condition above). Operate the unit through the appropriate modes to see
if any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check for Refrigerant Overcharge - Refer to Section 8.5.2. Must be correct.
2. Check Airflow Through Condenser Coil
a. Inspect condenser. Fins must be straight. 90% or more of the coil surface must be undamaged. No
“dead” air spaces. Condenser coil must be clean (refer to Section 8.7.2).
b. Check condenser airflow. Make sure there is even airflow through the entire coil and no “dead”
spots.
c. Check condenser fan rotation/operation. Fans should operate correctly. Air should be drawn in
through the grill, and directed out properly.
3. Check Evaporator Section - Check evaporator section, return air bulkhead, air chute, cleanliness of
evaporator coil and airflow. Refer to Section 9.2.10.
4. Check System For Non-Condensables - Check refrigeration system for non-condensable gas(es). No
non-condensable gas(es) may be present. Refer to Section 8.5.2.
5. Look for high discharge or low suction pressure causes - Refer to Alarm 00013 HIGH DISCHARGE
PRESSURE and 00018 LOW REFRIGERANT PRESSURE. Discharge and suction pressures must be in
normal range for the current ambient and refrigerated compartment temperature conditions. Refer to
Abnormal Pressure Troubleshooting Section 9.2.8.
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