Control method and system of gas water heater and gas water heater

Abstract

The invention discloses a control method and system of a gas water heater and the gas water heater. The control method comprises the following steps that in the working process of the gas water heater, the current opening degree of a gas proportional valve of the water heater is monitored, and current practical combustion heat quantity is worked out; whether the current opening degree of the gas proportional valve and the current practical combustion heat quantity accord with a preset standard function relation is judged; when the current opening degree of the gas proportional valve and the current practical combustion heat quantity do not accord with the preset standard function relation, it is determined that gas pressure is insufficient, and a low pressure control process is executed according to the current low pressure maximum thermal load; when the current opening degree of the gas proportional valve and the current practical combustion heat quantity accord with the preset standard function relation, a normal control process is executed. By applying the method and system to the gas water heater, the problems that because the gas pressure is insufficient, flameout and fire spreading are caused and the temperature of discharged water cannot reach a set temperature can be solved.

Description

technical field [0001] The invention belongs to the technical field of fluid heating, and in particular relates to a control method, a control system and a gas water heater for a gas water heater. Background technique [0002] The control system of the existing blast type gas water heater includes a controller, a blower fan, a gas proportional valve, an igniter, an outlet water temperature sensor, an inlet water temperature sensor and a water flow monitoring sensor. The input end of the controller is electrically connected with the input end of the controller, the output end of the water outlet temperature sensor, the inlet water temperature sensor and the water flow monitoring sensor are electrically connected, the igniter controls the burner in the water heater to enter the combustion state, the fan and the gas proportional valve are Send air and gas into the burner for mixed combustion, and the burner transfers the heat generated to the heat exchanger in the water heater,...

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Problems solved by technology

[0006] One of the objectives of the present invention is to provide a control method for a gas water heater, so as to solve the problems in the prior art that the gas water heater is turned off due to insufficient gas pressure, sparks fly and the outlet water temperature cannot reach the set temperature

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