The thermostatic expansion valve (TXV) regulates the flow of refrigerant into the evaporator based on the evaporator’s superheat. Superheat is the temperature of the refrigerant vapor above its saturation temperature. The procedure involves modifying the valve’s setting to achieve the optimal superheat for the system’s efficient operation. An improperly adjusted valve can lead to reduced cooling capacity, inefficient energy use, and potential damage to the compressor.
Correct calibration is critical for system performance. Too little refrigerant entering the evaporator results in starved coils, leading to higher superheat and reduced cooling capacity. Conversely, excessive refrigerant flow floods the evaporator, leading to lower superheat, potentially liquid refrigerant entering the compressor, and compressor damage. Historically, precise adjustment relied heavily on manual gauges and experience; however, modern diagnostic tools facilitate a more accurate and repeatable process.
