Gas water heater and control method

Abstract

The invention discloses a gas water heater comprising a water heater body, a water inlet pipe and a controller. The water inlet pipe is arranged in the water heater body, an operating device electrically connected with the controller is further included, the operating device is provided with a temperature setting button and a pre-heating function key, and the controller is used for automatically matching a preheating temperature difference according to the preset temperature when the pre-heating function key is started. Meanwhile, a control method for using the gas water heater is also disclosed. The invention has the following advantages that the preheating temperature difference can be automatically matched according to the preset temperature, so that the water heater can automatically adapt to different use occasions, and the intelligent degree is high; the gas water heater can automatically adjust the heat temperature difference according to the circulating water flow rate and / or the ambient temperature, and the self-adaptive ability of the water heater is further improved; and the advantages that circulating water is fully preheated in summer, and the preheating time of the circulating water is shortened and energy consumption is low in winter are achieved, and the user experience is increased.

Description

technical field [0001] The invention relates to the technical field of gas water heaters or dual-purpose furnaces, in particular to a gas water heater with self-adaptive capability and zero cold water function and a control method. Background technique [0002] Zero-cold water gas water heaters have become a trend in the water heater industry because they can turn on and use hot water immediately. When the preheating function is activated, the built-in circulation pump runs to drive the water circulation in the external hot water pipe and return pipe to achieve preheating. [0003] The preheating function of zero-cold water gas water heaters on the market completes the preheating shutdown pump conditions: return water temperature > preset temperature - preheating temperature difference (preheating temperature difference is generally 0 ~ 10 ℃). The preheating temperature difference is generally a fixed value or a manual setting value. This type of water heater cannot autom...

AI Technical Summary

Problems solved by technology

The preheating temperature difference is generally a fixed value or a manual setting value. This type of water heater cannot automatically adapt to different usage occasions, as follows:

[0004] 1. In summer, the temperature is high and the temperature of the water stored in the return pipe is also high (such as 32°C). When the preset temperature is low (such as 36°C) and the preheating temperature difference is relatively large (such as 8°C), after starting the preheating The return water temperature measured by the water heater (32°C) > preset temperature (36°C) - preheating temperature difference (8°C). When the preheating temperature is reached, the pump will be automatically turned off, which may cause insufficient preheating and affect the water experience

[0005] 2. In winter, the temperature is low and the temperature of the water stored in the return pipe is low (such as 10°C). The temperature difference between the air and the wall outside the hot water pipe in the circulation pipeline is large, and the heat loss is also large, so that the return water needs to be heated repeatedly to reach the preheating temperature, which prolongs the waiting time of the user and consumes a lot of gas

[0006] It can be seen that the common zero-cold water gas water heaters on the market cannot automatically adapt to different usage occasions: if the preset temperature is low in summer, a small preheating temperature difference needs to be set; if the preset temperature is high in winter, it needs to be set Larger preheating temperature difference

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