| 摘要 |
An air conditioner comprising a heat source unit and a utilization unit interconnected through refrigerant communication pipe in which it is judged accurately whether the refrigerant circuit is filled with an appropriate quantity of refrigerant or not. The air conditioner (1) can operate switchably in either a normal operation mode where the heat source unit (2) having a compressor (21) and a heat source side heat exchanger (23) is connected with utilization units (4, 5) having utilization side expansion valves (41, 51) and utilization side heat exchangers (42, 52) through refrigerant communication pipe (6, 7) and each apparatus is controlled depending on the operation load of the utilization units (4, 5) and a refrigerant quantity judging operation mode where the utilization units (4, 5) perform cooling operation and operation capacity of the compressor (21) is controlled such that the evaporation pressures of the utilization side heat exchangers (42, 52) are constant while controlling the utilization side expansion valves (41, 51) such that the degree of overheat at the outlet port of the utilization side heat exchangers (42, 52) is a positive value. In the refrigerant quantity judging operation mode, it is judged whether the refrigerant circuit (10) is filled with an appropriate quantity of refrigerant or not by detecting the degree of overcooling at the outlet port of the heat source side heat exchanger (23). ® KIPO & WIPO 2008
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