| 摘要 |
PURPOSE:To make it possible to always operate with excellent efficiency with a simple construction by selecting from a pattern which is beforehand set up the frequency of an inverter compressor, the pulses of an indoor side electrically operated expansion valve and an outdoor side electrically operated expansion valve by the temperature difference of a set temperature of an indoor unit and room temperature and the capacity of operation of the indoor unit and the outdoor air temperature. CONSTITUTION:During the room cooling operation, the coolant that is discharged from an inverter compressor 1 radiates heat and condenses from a four-way valve 2 to an outdoor side heat exchanger 3, passes through an outdoor side electrically operated expansion valve 4 and a liquid piping 12, and is depressurized in indoor side electrically operated expansion valves 10a and 10b, then absorbs heat and evaporates in indoor side heat exchangers 9a and 9b to cool the room, and then circulates to a gas piping 13, four-way valve 2, accumulator 5, and inverter compressor 1. At this time the frequency of the inverter compressor 1 and the pulses of an outdoor side electrically operated expansion valve 4 and indoor side electrically operated expansion valves 10a and 10b form a parameter with three items, the outdoor temperature detected by an outdoor temperature sensor 6, the operation capacities of the indoor units 8a and 8b which are detected by a capacity detector 14, and the temperature difference of a set temperature and room temperature detected by temperature difference sensors 11a and 11b and a selection is made from them.
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