| 摘要 |
PURPOSE:To enable to effect room heating for sleeping hours economically by a method wherein the system is constituted so as to change over a switch to a low temperature setting through a receptor element when a light is put off upon going to bed in order to enable to switch a room temperature adjusting device into a predetermined low temperature automatically. CONSTITUTION:During the operation of the room heating system, when the photoconductive element 32 is receiving a natural light by the sun or the light of an indoor electric lamp 33 and the resistance value thereof is reduced to a degree of 10KOMEGA, the output of an inverter INV becomes L level and a transistor Q is put OFF. Accordingly, a room temperature in this case is controlled in accordance with a set temperature which is set by a variable resistor 30. Next, when the lamp 33 is put off during said operating condition upon going to bed, the resistance value of the photoconductive element 32 is increased, the INV outputs H output and the transistor Q is put ON. Whereby, a relay switch Sr is switched to NO contact side thereof by a relay RY and a combustion control unit 34 is controlled to a low setting temperature which is set by the resistor Ro for the low temperature. |
