| 摘要 |
PURPOSE:To execute comfortable air-conditioning by comparatively widening a temperature difference between on-time and off-time when the open air temperature is high and a controller is used at a weak level, and narrowing the temperature difference between on-time and off-time when the open air temperature is low and the controller is used at a strong level. CONSTITUTION:When a variable resistance VR1 is set at a position of ''stong'', an output of an oscillating circuit OSC2 repeats ''H'' and ''L'' in a short period. An ''H'' signal is inputted to a comparing circuit III, a temperature of a sensible heat surface heating unitIstarts to fall, and even if a temperature of a sensible heat circuit does not fall to a level for energizing a conventional relay RY1, a transistor Q is turned on forcibly, the relay RY1 is energized, the heating unit Irises in its temperature, and on-off width is narrowed. Subsequently, even if an ''L'' signal is outputted from the oscillating circuit OSC2, the on-state is continued by a Schmitt circuit in the comparing circuit III, and the relay RY1 is not turned off until breaking the set voltage. When the resistance VR1 is set to ''weak'', the output of the OSC2 repeates ''H'' and ''L'' in a long period. When its period is selected so as to exceed a period for turning on the conventional relay RY1 of a temperature of the sensible heat circuit, the on-off width is widened. |
