| 摘要 |
PURPOSE: To make the indoor temperature uniform due to vigorous convection of the air, to suppress the unnecessary combustion and to delete the running cost by setting the number of revolutions of a warm air fan motor to the value higher than the normal value when a predetermined time is elapsed after the room temperature reaches the set temperature. CONSTITUTION: A room temperature is set by the temperature set switch 13 of an operation board 5. When the switch 11 is operated, it is recognized by a microcomputer 15 to drive a burner 7, thereby starting the combustion operation. Simultaneously, the microcomputer 15 controls the combustion amount of the burner 7 and the air flow rate of a warm water fan motor 9 based on the detected input of a room temperature sensor 14, and continues the combustion operation toward the set temperature. When the room temperature is gradually raised to reach the set temperature, a heater is weakly operated for the combustion to stabilize the room temperature. In this case, after the predetermined time is elapsed, the number of the revolutions of the motor 9 is set to the value higher than the normal value. Thus, the convection of the air is vigorously set to make the room temperature uniform, the unnecessary combustion is suppressed, and the running cost is reduced. |
