| 摘要 |
PURPOSE:To prevent frequent variations of air volume and contrive a stable temperature control by a method wherein a control of the air volume is effected by a stepwise switching and a difference is provided between an air volume switching point whereat a room temperature is approaching a zero temperature deviation point and another air volume switching point whereat the room temperature is going away from the zero temperature deviation point. CONSTITUTION:A detecting circuit 1 detecting a temperature deviation between a room temperature and a set temperature is provided with comparating amplifiers OP1-OP4 detecting temperature deviations corresponding to air volume switching points. A speed regulating signal to a blower motor BM is outputted from a speed setting circuit 2 in accordance with the outputs from the comparating amplifiers OP1-OP4. A speed switching circuit 3 puts on or off relays RL1, RL2 and varies a voltage impressed to the blower motor BM by switching switching cotacts rl1, rl2. Said detecting circuit 1 is constituted so as to make a difference between the air volume switching point whereat the room temperature is approaching to a zero temperature deviation point and another air volume switching point whereat the room temperature is going away from the zero temperature deviation point. Thus, a stable temperature control may be contrived. |
