Patent ID: 7886552

Claim:
A method of operation for an air conditioning system including an evaporator for conditioning inlet air, a refrigerant compressor that is cycled on and off to control a cooling capacity of the evaporator, and a heater core configured to re-heat a selected portion of the conditioned inlet air to affect a discharge air temperature of the system, the method comprising the steps of: determining a desired set point for the cooling capacity of the evaporator; determining what portion of the conditioned air is re-heated by the heater core; determining an allowed variation in the discharge air temperature; determining a required variation of the evaporator cooling capacity for achieving the allowed variation in the discharge air temperature based on allowed variation in the discharge air temperature and the determined portion of conditioned air that is re-heated by the heater core; and cycling the compressor on and off according to the desired set point and the required variation in evaporator cooling capacity.