Gas appliance and a control method thereof

A control method of a gas appliance, wherein the gas appliance is for connecting a gas supply pipe which is for injecting natural gas, the natural gas is one of a first natural gas and a second natural gas, and a heating value of the first natural gas and that of the second natural gas are different;

• the gas appliance includes a combustion device for burning the natural gas to generate flames, an ignitor, a gas valve, a blower, a detecting device, and a control device;
• the ignitor is disposed beside the combustion device to ignite the natural gas output by the combustion device;
• the gas valve communicates with the gas supply pipe and the combustion device, and is controlled to change a gas flow supplied to the combustion device;
• the blower is controlled to change an air flow supplied to the combustion device;
• the detecting device is for detecting a burning state of the flames of the combustion device;
• the control device electrically connects the gas valve, the blower, and the detecting device;
• the control method, executed by the control device, comprising the following steps:
• the control device is operated in a detection mode in which the control device controls the ignitor to ignite and controls the gas valve as well as the blower to provide a fixed gas flow and a fixed air flow to the combustion device;
• after igniting the flames, the control device determines whether the burning state detected by the detecting device matches a first state or a second state;
• if matching the first state, the control device is operated in a first operation mode and controls the gas valve and the blower in correspondence to a first control data of the first natural gas so the combustion device is suitable for burning the first natural gas;
• if matching the second state, the control device is operated in a second operation mode and controls the gas valve and the blower in correspondence to a second control data of the second natural gas so the combustion device is suitable for burning the second natural gas;
• wherein when the control device determines that the burning state detected by the detecting device matches the first state, the first operation mode is further configured to be a preset operation mode;
• after the control device controls the gas valve to block gas and controls the blower to stop running, the control device receives a start signal and then is operated in the preset operation mode to control the ignitor to ignite and control the gas valve and the blower in correspondence to the first control data;
• wherein when the control device determines that the burning state detected by the detecting device matches the second state, the second operation mode is further configured to be a preset operation mode;
• after the control device controls the gas valve to block gas and controls the blower to stop running, the control device receives a start signal and then is operated in the preset operation mode to control the ignitor to ignite and control the gas valve and the blower in correspondence to the second control data.