CAPACITY CONTROLLER FOR VARIABLE CAPACITY COMPRESSOR IN COOLER

摘要

PURPOSE:To prevent hunting by altering the capacity controlling mode of a variable capacity compressor when the occurrence of hunting is detected in blow-off air temperature or the like of an evaporator. CONSTITUTION:A calculation controller 17 sets a normal running capacity controlling mode and compares blow-off air temperature Tf with desired air temperature Tc on the basis of the set value while performing cooling operation by PID control. Thereafter, when the deviation of temperature Tf from temperature Tc becomes large and the occurrence of hunting is detected, the previous normal running capacity controlling mode is altered to a hunting restraint capacity controlling mode. Said controller 17, upon detecting that a blow-off wind amount regulator 22 is operated and the blow-off wind amount is altered, returns the mode to the normal running capacity controlling mode by a timer operation after the passage of a predetermined time.