Carrier Omnizone 50XCA06 Installation, Start-Up And Service Instructions Manual page 39

PROBLEM
Discharge Pressure too
Low
Suction Pressure too Low
Suction Pressure too High
Condensate Water Leaks
LEGEND
TXV — Thermostatic Expansion Valve
Table 23 — Troubleshooting Procedure (cont)
POSSIBLE CAUSE
Outdoor temperature too low
Condenser airflow too high
Low charge
Compressor fault
Discharge pressure is low
Low thermal load
Low refrigerant
Low airflow in evaporator
Low refrigerant flow in evaporator
High thermal load
Compressor defect
Defective connection
Blocked drain
Drain lines incorrect
CORRECTION PROCEDURE
Install low-ambient control.
Check and adjust.
Check for and repair leaks and add refrigerant as necessary.
Check suction and discharge pressure.
See Discharge Pressure Too Low section of this table above.
Check building load.
Check for and repair leaks and add refrigerant as necessary.
Clean filter.
Remove scale.
Check for blockage in ducts.
Check fan rotation.
Check motor operation.
Check belts.
Check for obstruction in filter drier.
Check for obstruction in TXV.
Check super heating.
Check position of TXV bulb and equalizer.
Check design conditions.
Check pressures, and replace if necessary.
Check and correct.
Clean drain pan.
Check and correct.
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