Low-pressure working method of gas water heater

Abstract

The invention relates to a low-pressure working method of a gas water heater. The low-pressure working method comprises the following steps that S1, when the gas water heater works, a target load Q ofthe gas water heater is calculated to be obtained according to working parameters of the gas water heater; S2, whether the gas water heater needs to work in a full-load state or not is judged according to the calculated target load Q of the gas water heater, and if yes, S3 is conducted to conduct low-pressure judgment on the gas water heater; and if not, the gas water heater is controlled to worknormally; S3, the rotating speed of a fan in the gas water heater is controlled to be the preset rotating speed V at which the gas water heater can maintain combustion; S4, the actual load Q1 of thegas water heater is obtained through calculation; and S5, the Q1 is compared with the rated maximum load Q0 of the gas water heater, and then whether a low-pressure gas condition occurs or not is judged. According to the low-pressure working method of the gas water heater, low-pressure judgment can be conducted only when the gas water heater needs to work in the full-load state, and the low-pressure result obtained at the moment is more accurate and has more control and guidance significance.

Description

technical field [0001] The invention relates to the technical field of gas water heaters, in particular to a method for judging low air pressure of a gas water heater without water inlet temperature detection. Background technique [0002] In the cold season, the usage rate of gas water heaters is relatively high, and the primary pressure of the gas entering the household will be low, which will lead to a decrease in the rated heat load of the gas water heater, which will reduce the thermal comfort of the gas water heater and cause poor user experience. During the combustion process of the gas water heater, according to the target load, a certain gas proportional valve opening and fan speed will be set. When the primary pressure is low, the gas volume will be significantly reduced under the same proportional valve opening. Working at the set fan speed will cause a large deviation in the air-fuel ratio, resulting in a decrease in heat load. Therefore, when the gas water heat...

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Problems solved by technology

[0005] Therefore, during the use of the gas water heater, it is not necessary to judge the low air pressure when the gas proportional valve can be adjusted, and there are many factors that affect the normal operation of the gas water heater. The accuracy of low air pressure is not high, and it may also be that the load caused by other factors cannot meet the target load

However, when the gas water heater is in the rated maximum load working state where the gas proportional valve cannot be adjusted, if low pressure occurs, it will have a greater impact on the normal operation of the gas water heater, and it is precisely in this state that the gas proportional valve is low. Air pressure judgment can effectively control the normal operation of gas water heaters, but this problem has not been found in the prior art and a solution to this problem has been proposed

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