Patent ID: 7721560

Claim:
A central air conditioning system for controlling temperature and humidity in an enclosure, comprising: a control unit that has a thermostat and a dehumidistat and can direct a cooling and dehumidification cycle and a dehumidification-only cycle; a supply duct and a return duct; an outdoor condensing unit that comprises a condenser unit and a fan; an air handler disposed between the return duct and the supply duct that comprises a blower fan for circulating air into the supply duct, an evaporator coil, and a re-heating coil that maintains a refrigerant flood level from one cycle to the other; refrigerant line system joining the compressor, evaporator coil, and the re-heating coil; a cooling solenoid valve; and a dehumidifier solenoid valve downstream from the re-heating coil; wherein the control unit, based on the temperature and the humidity of the enclosure, is capable of independently activating the cooling solenoid valve and the dehumidifier solenoid valve to direct refrigerant to the re-heating coil to allow for a dehumidification-only cycle within the enclosure while providing air to the supply duct that is substantially the same temperature as the air in the return duct, and wherein when the control unit independently activates the dehumidification solenoid to maintain refrigerant in the re-heating coil at a maintained flood level from one cycle to another cycle.