Abstract: A management apparatus and a management method which can forecast inspection time before the lowering of performance or the occurrence of abnormality in a heat source unit for an air conditioner are provided. The operating condition of the air conditioner heat source unit is monitored by a central monitoring unit of the management apparatus connected to the heat source unit through an information communication network. Operating data of the heat source unit is analyzed so that the lowering of the performance and the advance of the degree of abnormality in the heat source unit are diagnosed. Thus, the loss of a user caused by the failure stop or the performance lowering of the heat source unit is reduced. Further, the load on the heat source unit is grasped by the central monitoring unit so that remote central control is carried out to make the operating cost minimal.

Abstract: A management apparatus and a management method which can forecast inspection time before the lowering of performance or the occurrence of abnormality in a heat source unit for an air conditioner are provided. The operating condition of the air conditioner heat source unit is monitored by a central monitoring unit of the management apparatus connected to the heat source unit through an information communication network. Operating data of the heat source unit is analyzed so that the lowering of the performance and the advance of the degree of abnormality in the heat source unit are diagnosed. Thus, the loss of a user caused by the failure stop or the performance lowering of the heat source unit is reduced. Further, the load on the heat source unit is grasped by the central monitoring unit so that remote central control is carried out to make the operating cost minimal.

Abstract: The present invention provides a method for detection of a vacuum leak of a vacuum vessel provided in an equipment, for example, an absorption chiller, and in which water and a solution (for example, lithium bromide solution) are charged. The gas in the vacuum vessel is purged by an auxiliary air pump while spraying helium as trace gas by a helium spray gun to the outer surface of the vacuum vessel under inspection of the absorption chiller, a part of the purged gas is passed through a dehumidifier where the steam is removed from the gas, a part of the purged gas is depressurized by reducing the partial pressure of the steam to zero, and it is detected by a helium-leak detector whether or not the trace gas (helium) leaks from the vacuum vessel. This method and an apparatus for carrying out the method permit to check for any vacuum leak and quantitatively determine it quickly, easily and with a high sensitivity whether the equipment under inspection is in or out of operation.