| 摘要 |
A normally closed, single pole, single throw, thermostatic switch is electrically connected in parallel relationship across a timer motor. The parallel network constituted by the timer motor and switch is connected in series relationship with a gas burner regulation circuit. The series-parallel network, constituted by the interconnected timer motor, thermostatic switch, and burner circuit, is electrically connected between two main power lines via timer motor controlled contacts. The impedance of the timer motor is substantially greater than the impedance of the burner circuit. Thus, when the thermostatic switch opens, the timer motor runs while the series-controlled lower impedance burner control circuit, and its associated gas burner, do not operate. Under predetermined decreasing temperature conditions, the thermostatic switch will reclose to deenergize the timer motor and energize the burner control circuit. Such a simplified control circuit provides for both time and temperature dependent regulation of the associated gas burner, such as is used in a gas heated automatic clothes dryer of the domestic type.
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