Emerson ZX User Manual page 49

With additional tools, the technician can find out more about the system guided by the following
table :
Refrigerant Overcharge
Refrigerant Undercharge
Restriction at the Filter Drier
Low Evaporator Airflow
Blocked or Dirty Condensor Coil
TXV with lost bulb charge
High Evaporator Airflow
Dragging or Seizing Compressor
Electrical Phase Imbalance
Non-Condensibles in system
High : Higher than Normal
Low : Lower than Normal
Discharge Discharge
Pressure Temperature Pressure
High Low
Low High
Low High
Low Low
High High
Low Low
High High
Low High
Low High
High High
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Suction Superheat SubCooling Amperage
High Low
Low High
Low High
Low Low
High Low
Low High
High High
High High
High High
High High
Draw
High High
Low Low
High Low
High Low
Low High
High Low
Low High
High High
High Low
Low High