How to Diognose Refrigerant Overcharge, TXV System

When a system with a TXV metering device is overcharged, the suction pressure and superheat may appear normal.  The normal conditionsare a result of the TXV regulating the refrigerant flow independent of the compressor.

The excess refrigerant is stored in the condenser coil and increases the head pressure and liquid subcooling.  If the charge is high enough the suction pressure may be elevated with a slightly low superheat.

Higher pressures increase power required for system operation.

Remove refrigerant in accordance with the manufacturers instructions to obtain the desired or target subcooling.