| 摘要 |
PURPOSE:To make it possible to make early repair on a suitable time by outputting a display signal when the number of times of operation of a protective device reaches set times and displaying the occurrence of an abnormality. CONSTITUTION:A display control device 13 outputs a display signal respectively when the number of measurements by a first counter 9 is two in one season and when the number of measurements by a second counter 10 is four, energizes a luminous diode 14 to light it, and thus displays the occurrence of an abnormality. Only when the electric power source is thrown in with a self-diagnosing switch 15 turned ON, a control section 6 on the outdoor side passes electric current through relays for a compressor 2, four-way switching valve, outdoor fan, indoor fan, etc., without actuating them according to a specified program which is stored beforehand with a specified period. It is, therefore, possible to check easily with tester, etc., whether electric current is flowing normally.
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