| 摘要 |
PURPOSE:To concentrate a load, and to execute an operation having high load and high efficiency, by controlling by use of plural thermostats before all the thermostats are turned off after an electric power supply has been turned on, and after that, controlling by use of a timer. CONSTITUTION:Solenoid valves SV1-SV3 are opened and closed by the respective thermostats TH1-TH3. The opening and closing states of the termostats are supplied to logical circuits 18, 21 through an inputting circuit 13, and a detecting device 36 of the period before all the thermostats are turned off once after the electric power supply has been turned on. Before the device 36 detects said states, opening and closing of the valves SV1-SV3 are controlled by only the thermostats TH1-TH3. After the device 36 have detected said states, control which has used a timer 30, too is started. |
