Air conditioning system

A method of operating an air conditioning system for conditioning air in a plurality of enclosed areas in a building, each of the enclosed areas having a peripheral portion requiring conditioned air having a variable temperature, and an interior portion requiring conditioned air at a constant temperature, comprising the steps of:

• delivering a first conditioned air stream to a terminal serving the peripheral portion of said area, the temperature of said conditioned air being varied in accordance with the temperature of the ambient air;
• delivering a second conditioned air stream to a terminal serving the interior portion of said area, the temperature of said air being maintained at a relatively constant level;
• regulating the quantity of the relatively constant temperature conditioned air discharged from said terminal to said area in accordance with the temperature conditions within the area;
• generating a control signal, the magnitude of the signal varying in accordance with the quantity of constant temperature conditioned air supplied to the area;
• sensing the temperature of the first conditioned air supply;
• delivering the control signal, when the temperature of the first conditioned air supply is relatively warm, to a control operable to regulate the quantity of said relatively warm conditioned air discharged into said area from the first terminal portion;
• increasing the quantity of relatively warm air discharged into said area when the magnitude of the control signal varies to indicate that the quantity of said constant temperature air discharged into said area is decreasing;
• and
• decreasing the quantity of relatively warm air discharged into said area when the magnitude of the control signal varies to indicate that the quantity of said constant temperature air discharged into said area is increasing.