System for refrigerant charge verification using two condenser coil temperatures

A charge-verification system for a circuit including a compressor and a condenser having an inlet, an outlet, and a coil circuit tube extending between the inlet and the outlet, the charge-verification system comprising:

• a first temperature sensor located on said coil circuit tube a first distance from said inlet;
• a second temperature sensor located on said coil circuit tube a second distance from said inlet;
• a controller receiving a first signal from said first temperature sensor indicative of a first temperature and receiving a second signal from said second temperature sensor indicative of a second temperature, said controller determining which of said first signal and said second signal is closer to an actual saturated condensing temperature of the condenser;
• and
• a liquid line temperature sensor providing a signal to said controller indicative of a liquid temperature of a liquid circulating within the circuit,
• wherein said controller controls the compressor based on one of said first signal and said second signal, and
• said controller determines a charge condition based on a comparison of at least two of the first temperature, the second temperature, and the liquid temperature.