JPS5773336A - Air conditioner controlling method - Google Patents

Abstract

PURPOSE: To lower the frequency of frost-removing operation and to enlarge the operable range of an air conditioner, by detecting frosting of an indoor heat exchanger during cooling operation from the temperature of air at the outlet, that at the inlet and continuous operating time of a compressor, and removing frost of the heat exchanger by interrupting operation of the compressor for a predetermined while.

CONSTITUTION: Temperatures detected respectively by an inlet temperature sensor 20 and an outlet temperature sensor 30 are afforded to a microcomputer 50 via an A/D converter 40. The micro-computor 50 compares the inlet and outlet temperatures thus detected with respective set temperatures, judges the state of frosting from the operation time of a compressor, gives to a compressor driving means 70 a signal for stopping operation of the compressor 80, and thereby stops operation of the compressor 80 according to a predetermined program. During the while after stoppage of the compressor, frosting of a heat exchanger is removed by way of stantaneous melting. On the other hand, after passing of a certain time determined by a reference clock generator 60, operation of the cmpressor 80 is recommended. By repeating the above process, it is enabled to lower the frequency of frost-removing operation and to therby enlarge the operable range of the air conditioner.

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