| 摘要 |
PROBLEM TO BE SOLVED: To set a rotational angle of a louver at a lower blowing port and dampen an air flow feeling at the time of starting a heating operation so as to form a shoot circuit for returning a part of an air flow from the lower blowing port into the suction port over a period ranging from a time in which a temperature of a heat exchanger reaches a predetermined temperature at the time of starting the heating operation to a predetermined period. SOLUTION: When a temperature of a heat exchanger 15 exceeds a first level at the initial time of heating operation, a louver 7 at an upper blowing port 5 is set to a rotational angle of less draft feeling, and then an upper side fan 17 is rotated. At this time, louvers 9, 10 at the lower side blowing port 6 are set to a rotating angle to close. When the level exceeds the second level, the louver 7 is set to send a maximum air volume. When the level exceeds the third level, rotational angles of the louvers 9, 10 are set to angles where a short circuit to cause a part of air flow from the lower side blowing port 6 to be circulated is formed and the lower side fan 18 is rotated. When the level exceeds the fourth level, the number of rotation of the lower side fan 18 is slightly decreased and the louvers 9, 10 are set to rotational angles where air volume becomes maximum value. |
