Carrier Omnizone 50XCW06 Installation Start-Up And Operatig Instructions page 40

PROBLEM
Suction pressure too low
Suction pressure too high
Condensate water leaks
LEGEND
TXV Thermostatic Expansion Valve
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Table 14 — Troubleshooting Procedure (cont)
POSSIBLE CAUSE
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
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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