Patent Document ID: 7558700
Application ID: 10585946
Patent Flag: 1

Claim One:
1. A refrigerating cycle apparatus comprising: a refrigerating cycle formed by fluidly connecting a compressor having a suction side and a discharge side, a condenser, an expansion unit and an evaporator via a pipeline, and flowing a refrigerant through the inside thereof; a high pressure side measurement unit that is at least one of a high pressure measurement unit for measuring a high pressure corresponding to a refrigerant pressure at any position on a flow passage leading from the discharge side of the compressor to the expansion unit or a condensation temperature measurement unit for measuring the saturation temperature at the high pressure; a low pressure side measurement unit that is at least one of a low pressure measurement unit for measuring a low pressure corresponding to a pressure of refrigerant at any position on a flow passage leading from the expansion unit to the suction side of the compressor or an evaporation temperature measurement unit for measuring the saturation temperature at the low pressure; a refrigerant temperature measurement unit that is at least one of a liquid temperature measurement unit for measuring the temperature at any position on a flow passage leading from the condenser to the expansion unit, a discharge temperature measurement unit for measuring the temperature at any position on a flow passage leading from the compressor to the condenser, or a suction temperature measurement unit for measuring the temperature at any position on a flow passage leading from the evaporator to the compressor; an arithmetic unit for performing an arithmetic operation on composite variables from measured values of the high pressure side measurement unit, the low pressure side measurement unit and the refrigerant temperature measurement unit; and a judgement unit for judging an operating condition of the refrigerating cycle based on a comparison result by comparing values stored in the past and current measured values or arithmetic values, as well as storing each of the measured values or the arithmetic values, wherein the judgement unit for judging the operating condition of the refrigerating cycle acquires a threshold for distinguishing between a normal operating condition and an abnormal operating condition by converting at least one of the measured values or the arithmetic values into another value and making the arithmetic operation on a plurality of variables including the value after conversion.