| 摘要 |
PURPOSE:To prevent heating from being suspended in a severly cold winter by moving a mixing damper forcively to the hot side when a trouble is found in either an air mixing damper position detecting device or a drive section of a control device concerning the control of the air mixing damper. CONSTITUTION:A control signal is outputted from an arithmatic unit 11 of a control device 10 based on information from both a temperature setting device 1 and an air mixing damper position detecting device 2 in a device as referred to the titled. This allows a drive section 12 to output a drive signal to an actuator 3 which controls the opening of an air mixing damper 4. In this configuration, the control device 10 is provided with a trouble detecting section 13. When a trouble is detected by the said detecting section 13 in both the drive section 12 and the said position detecting device 2, a trouble detection signal is outputted to an emergency drive section 14. This allows the emergency drive section 14 to keep outputting a drive signal so as to drive the said damper 4 to the hot side for the period of time required for the damper 4 to move to the hot side from the cool side. |
