Gas-Fired Heating Appliance Having a Flammable Vapor Sensor Control Device
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United States of America Patent
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Issued Date -
Jan 1, 2009
app pub date -
Jun 28, 2007
filing date -
Jun 28, 2007
priority date (Note) -
Abandoned
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Abstract
A gas-fired heating appliance includes a burner, a gas valve module for supplying a fuel gas to the burner, a power module for applying a voltage to the gas valve module, and a flammable vapor sensor module for detecting a flammable vapor. The flammable vapor sensor module interrupts the voltage to the gas valve to shut off the gas valve and the burner when the flammable vapor module detects the presence or a predetermined concentration of flammable vapor. The voltage of the power module is applied to the gas valve module through the flammable vapor sensor module. The voltage to the gas valve module is interrupted if the flammable vapor sensor module is short-circuited. This arrangement is tamper-resistant to promote a safe operation of the gas-fired heating appliance.
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