| 摘要 |
A gas valve ( 22 ) control system ( 10 ) for a heater includes a burner ( 26 ) and a valve ( 22 ) that has a high flow stage and a low flow stage. The valve ( 22 ) supplies fuel to the burner ( 26 ) in the high flow stage until the burner ( 26 ) is ignited. While operating in the high flow stage, an inducer ( 24 ) that supplies combustion air to the burner ( 26 ) operates in a high speed stage. The valve ( 22 ) and the inducer ( 24 ) are controlled by a controller ( 12 ). A timer ( 28 ) is used to coordinate the valve ( 22 ) and the inducer ( 24 ) such that after a predetermined amount of time, the valve ( 22 ) switches to a low flow stage and the inducer ( 24 ) switches to a low speed stage. This is to provide the burner ( 26 ) with more fuel and combustion air while igniting and to reduce condensation in the heater.
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