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(11) | EP 1 016 829 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Combustion control method for gas boiler |
| (57) A combustion control method for a gas boiler capable of maintaining a stable combustion
state by using a flame voltage by means of an infrared sensor is provided. In the
method, it is judged whether a flame voltage is higher than a reference forward wind
flame voltage when combustion occurs in the gas boiler. A fan voltage is firstly controlled
awhen the flame voltage is higher than the reference forward wind flame voltage and
it is judged whether the flame voltage is lower than a reference reverse wind flame
voltage when the flame voltage is lower than or equal to the reference forward wind
flame voltage. The fan voltage is secondly controlled awhen the flame voltage is lower
than the reference reverse wind flame voltage, and the first controlled fan voltage
to an original fan voltage according to change amount of the fan voltage by the first
control of the fan voltage or the second control of the fan voltage when the flame
voltage is equal to or higher than the reference reverse wind flame voltage is compensated.
According to the method, when a combustion is imperfect due to external environment
such a forward or reverse wind, it can maintain a stable combustion by controlling
a fan voltage. |