Symptom: Low Capacity

Possible Cause: Airflow is outside specification.
Corrective Action: Units are designed to provide a particular leaving air temperature at a particular CFM. Verify proper air balance.
Possible Cause: Dirty evaporator coil.
Corrective Action: Clean coil.
Possible Cause: Inadequate refrigerant feed.
Corrective Action: Verify system piping meets piping sizes and requirements. Check TXV operation and filter-dryer.
Possible Cause: Oil in evaporator.
Corrective Action: Warm coil and allow oil to drain. Verify risers are trapped per piping documentation.