| 摘要 |
An improved control arrangement for an air heating apparatus having a multi-volt electrical power source, a power control circuit for energizing air blower means and air heating means, and a safety control circuit for de-energizing the power control circuit in response to an unsafe operating condition. The safety control circuit includes a thermoelectric generator which is activated by heat emitting means disposed within the power control circuit. The safety control circuit further includes a relay actuating winding in series with the thermoelectric generator, the relay actuating winding actuating a relay switch means. The improvement is in the relay switch means which includes a parallel combination of a normally closed switch and dropping resistor, the combination being in series with the heat emitting means so that when the relay switch means is actuated the heat emitting means is subjected to reduction in heat output.
|
