7–17
62-11640
00024
COMPRESSION RATIO EXCEEDED
• ACTIVATION: If the compressor compression ratio is greater than 24 for 20 seconds.
• UNIT CONTROL: Engine Operation: Engine and unit shutdown and alarm.
Electric Operation: Refrigeration system shutdown and alarm with PSCON still ener-
gized.
• 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
2.
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
).
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 into the engine compartment.
3.
Check Evaporator
Section
Check evaporator section, return air bulkhead, air chute, cleanliness of evaporator coil and airflow.
Refer to
4.
Check System For Non-Condensables
Check refrigeration system for noncondensable gas(es). No noncondensable gas(es) may be pres-
ent. Refer to
5.
Look for high discharge or low suction pressure
causes
. Discharge and suction pressures must be in normal range for the current ambient and refrig-
erated compartment temperature conditions. Refer to Abnormal Pressure Trouble Shooting
.
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