| 摘要 |
PROBLEM TO BE SOLVED: To judge correctly the degree of dirt in an indoor filter by prohibiting the integration of hours of an indoor fan rotation in the case of forming a short circuit air stream in which air blown from an outlet port flows into a suction port in a short circuit, and integrating hours only during which the indoor filter substantially becomes dirty. SOLUTION: Directions in which air-flow direction control plates 10, 11 are turned are found by a short circuit judging means on the basis of a state of the operation or non-operation of a motor for air-flow direction control plates, and the presence of the formation of a short circuit air stream 50 is judged. In integrating rotating hours of an indoor fan 9, the integration of operating hours is prohibited in the case of forming the short circuit air stream 50. That is, in the case where air, which has passed through an indoor filter 6, is blown from an outlet port and returns to the indoor filter 6 in a short circuit and when it does not substantially make the indoor fan dirty, operating hours are not integrated, whereby the degree of dirt in the indoor filter 6 can be accurately determined, and the necessity of cleaning the filter 6 can be correctly displayed. |
