7–17 62-11785
00053 BOX TEMP OUT-OF-RANGE - CONTINUED
3. Check For Any Shutdown Alarm(s) - Check the Alarm List for any shutdown alarms. Alarm conditions
must be corrected and the alarm cleared to continue.
4. Check For Alarm 00018 LOW REFRIGERANT PRESSURE - Alarm conditions must be corrected and
the alarm cleared to continue.
5. Check Refrigerant Charge - Refer to Section 8.5.2. Charge must be correct.
6. Check System Pressures - Install manifold gauge set and check and compare compressor discharge &
suction pressures with those shown in Unit Data. Refer to Section 8.7.11 for instruction on comparison.
7. Perform Pretrip Check - Clear Active Alarm list, then run Pretrip & check for any new alarms. Any active
alarms must be corrected and cleared before proceeding.
8. Check For Low Delta-T - Read delta-t from Unit Data. In Cool, the delta-t must be greater than (cooling
more than) -1°F (-0.56°C). In Heat, the delta-t must be greater than 0 (SAT must be higher than RAT).
00054 DEFROST NOT COMPLETE
• ACTIVATION: Defrost cycle did not complete within 45 minutes.
• UNIT CONTROL: Alarm only. While this alarm is active, the Defrost Timer will be set to initiate a defrost
cycle 90 minutes (1.5 hours) of unit running time after the alarm comes on.
• RESET CONDITION: Auto Reset when defrost cycle is started again, 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 (see 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. Perform Pretrip Check - Clear Active Alarm list, then run Pretrip & check for any new alarms. Any active
alarms must be corrected and cleared before proceeding.
2. Check For Defective Defrost Sensor Location/Correct Installation - Has sensor fallen from location?
Must be corrected to continue.
3. Check Evaporator Fan Contactors - Check that contactors are not energized and that the contacts are
not stuck closed in defrost. Must de-energize evaporator fan during defrost.
4. Check Evaporator Heater Current Draw - Check Heater amp draw at 1HTCON1 & 1HTCON2. These
checks must be made with the unit operating. Verify that all three actual amperage readings for each
component are within 10% of each other, and are within the values shown in Section 2.9.
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