62-11637 7–30
00056 CHECK EVAPORATOR AIR FLOW
• ACTIVATION: In the Heat Mode, the Suction pressure has been higher than 100 PSIG (6.8 bar) for more
than 60 seconds OR
In the Cool Mode, the SAT is 5°f (2.8°c) or more warmer than RAT for 3.5 minutes. After the first occur-
rence of this alarm, the MessageCenter will display “NO TEMP CONTROL - SEE ALARM LIST”.
NOTE
For this alarm the unit must be running. This alarm will not occur in either the Defrost or Pretrip cycles.
• UNIT CONTROL: Unit Shutdown & Alarm.
• RESET CONDITION: Auto reset in 15 minutes IF Alarm 00030 is not also active or, alarm may be manually
reset using the display mounted keys 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 Airflow Through Evaporator Coil/Section
a. Inspect coil. Ninety percent or more of the coil surface must be undamaged. Coil must be clean.
b. Check airflow (with unit running). Even airflow through the entire coil. No “dead” spots.
c. Check return air bulkhead, air chute. Verify good air flow, and Return Air not restricted. Air chute in good
condition.
d. Check fan clutch. Must be fully engaged. Check upper and lower fan belt tension & condition. Verify no
glazing, cracking, or slipping. Refer to Section 8.6. Replace if required.
2. Check System Pressures
Install manifold gauge set and check and compare compressor discharge & suction pressures with
those shown in Unit Data. Refer to Section 8.9.12 for instruction on comparison.
3. Check Refrigerant Charge
Refer to Section 8.7.2. Charge must be correct.
4. Perform Pretrip Check
Run Pretrip & check for alarms. Any active alarms must be corrected and cleared before proceeding.
5. Check SV4
Refer to SV4 Checkout Procedure, Section 8.9.6.
6. Refer to Refrigeration Troubleshooting
Check low cooling capacity causes. Refer to Section 9.3.2 & Section 9.3.4.
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