Refrigerant Charge Calculator
The Refrigerant Charge Calculator helps estimate the total refrigerant charge required for an air conditioning or heat pump system, particularly when line set lengths differ from the standard length for which the unit was factory-charged. It takes into account the base charge of the unit, the actual length of the refrigerant lines, and typically the diameter of the liquid line (or a manufacturer-specified additional charge per foot). Accurate refrigerant charge is critical for optimal system performance, efficiency, and longevity. This tool provides a preliminary estimate for field adjustments.
Signs of Incorrect Refrigerant Charge: An incorrect charge can lead to various problems. Undercharge symptoms include reduced capacity, low suction pressure, high superheat, and evaporator icing. Overcharge symptoms include reduced capacity/efficiency, high head pressure, low superheat, and potential liquid slugging of the compressor. Accurate charging by superheat (fixed orifice) or subcooling (TXV/EXV) methods by a qualified technician is crucial.
This calculator provides an ESTIMATE only. Always refer to the specific manufacturer's installation manual for the correct charging procedure, base charge details, additional charge per foot, and any adjustments for filter driers, accumulators, or vertical rise. Proper charging requires tools like gauges, thermometers, and scales, and methods like superheat or subcooling. Incorrect charge can damage equipment and reduce efficiency.