PURPOSE: To make capacity control possible in a wide range by a method wherein a controller compares a detected value detected by a load detection means with a preset value, capacity variations are effected by the control of an inverter power source means, and a refrigerant flow passage control means is utilized when further capacity variations are required.
CONSTITUTION: A controller 43 compares data from detectors 41 and 42 and a frequency signal from an inverter 44 with the operational condition of a compressor, which is stored therein, and produces a signal to a flow rate control mechanism 46 to control the same. The flow rate control mechanism 46 controls the flow rate of refrigerant flowing into heat exchangers 34 and 36. According to the control made by this flow rate control mechanism 46, capacity variations are further made possible beyond the upper or lower limit of the frequency variation range of the inverter.
KUNO HIROAKI
UCHIKAWA NAOSHI
OKAMOTO JOJI
IMAMURA HIROYUKI
HITACHI SHIMIZU ENG KK