| 摘要 |
A control apparatus of an air conditioning system includes a sensor (24) which detects the level of the surface of liquid refrigerant in an accumulator (23) of a refrigeration circut of the air conditioning system. In one example, the detected liquid level is compared with an upper and a lower limit value by a pair of comparators (27,28) and a logic circuit (35), and, if it is greater than the upper limit value or lower than the lower limit value, a micro-computer (36) instructs a pulse motor (M) to reduce or increase in size respectively the orifice of an expansion value (21) in the refrigeration circuit. For a predetermined period of time after start-up of the refrigeration circuit, the micro-computer (36) can be arranged to keep the orifice open a predetermined extent.
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