| 摘要 |
PURPOSE:To prevent a flashing phenomenon and to enable a stable operation to be carried out by a method wherein a reduction in cooling capacity against a condenser caused by an aging deterioration of cooling fins or damaged clogging at the cooling fins is detected in response to a variation of the number of rotation in an air-cooled fan to inform a user of a clogged state in the cooling fins. CONSTITUTION:A controller 30 controls each of a blower fan 11, an air-cooled fan 17, a pump 23, a control valve 15 in a fuel supplying pipe 14, various valves V1 to V5 and an alarm lamp 33 in response to various sensing signals produced from various sensors T1 to T6 arranged outside an outdoor device and output signals produced form a communication control device 31. At this time, the controller 30 stores an appropriate number of rotation of the air-cooled fan 17 for keeping a temperature at an outlet of a condenser 16 constant in response to a heating amount of a regenerator 12 as well as a surrounding air temperature, an actual number of rotation of the air-cooled fan 17 and a time-series variation data in the actual number of rotation. In the case that the variation data exceeds a specified value, a clogged state in the cooling fan at the condenser 16 is set to be alarmed.
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