Many times technicians will have the tendency to overcharge refrigeration systems. It is an easy mistake to put too much refrigerant into a system because of the vast array of different systems on the market today. Also, many symptoms for other system problems look similar, but not exactly like an overcharge of refrigerant.
The system described here that is overcharged is a low-temperature commercial refrigeration system incorporating a TXV metering device with a receiver. The refrigerant is R-134a.