REFRIGERANT RECOVERY CONTROL METHOD FOR AIR CONDITIONING SYSTEM

摘要

PROBLEM TO BE SOLVED: To decrease the number of recovering times of refrigerant while shortening the recovering time by starting refrigerant recovery control in an outdoor heat exchanger when a vaporization tube exceeds a specified temperature, setting a refrigerant recovery time depending on the detected temperature of a compressor and operating the compressor for the refrigerant recovery time. SOLUTION: After the temperature of a vaporization tube 35 provided in a refrigerant heater 28 is received from a combustion system controller, temperature of the vaporization tube 35 is checked. If it is lower than a specified level, a preheat command is delivered to the combustion system controller before the control moves to a next step otherwise the control advanced to next step directly. Retrigerant recovery control decision is then made and refrigerant recovery control in an outdoor heat exchanger 8 is started when the vaporization tube 8 exceeds a specified temperature. A refrigerant recovery time is then set depending on the detected temperature of a compressor 6 and the compressor 6 is operated for the refrigerant recovery time. This arrangement can recover refrigerant efficiently in a short time.