AIR CONDITIONING APPARATUS HAVING TWO REFRIGERATING CIRCUITS IN CENTRAL UNIT AND CONTROL METHOD OF DEFROSTING

摘要

An air conditioning apparatus includes two different refrigerating circuits in one central unit for supplying a conditioned air into a defined space through an air duct. Each refrigerating circuit has an air exhausting damper for exhausting internal air from the defined space, and an external air intake damper for taking the external air into the defined space through the central unit. One of the refrigerating circuits forcibly carries out the heating operation, and the external air intake damper thereof is maintained in a closed state while the other refrigerating circuit carries out the defrosting operation to prevent temperature of the conditioned air fed from the central unit into the defined space from decreasing below a desirable level.