Water circulation control method of fuel gas hot water device

Abstract

The invention relates to a water circulation control method of a fuel gas hot water device. After a domestic water preheating start signal is received, a domestic water circulation pump is controlledto work, and then the fuel gas hot water device is controlled to perform preheating work of the domestic water circulation loop according to the set temperature; if the domestic water is started in the preheating process, the domestic water circulation pump is controlled to stop working, and meanwhile, the fuel gas hot water device is controlled to perform heating work according to the set temperature. According to the water circulation control method of the fuel gas hot water device, the influence of the water flow temperature in the domestic water circulation loop on the water inlet water temperature of domestic water is avoided, the water inlet temperature of domestic water is prevented from continuously increasing or changing frequently, the problem that the working parameters of the fuel gas hot water device continuously change to influence the accuracy of domestic water outlet constant temperature control is avoided, and the user experience is improved.

Description

technical field [0001] The invention relates to a water circulation control method of a gas water heater. Background technique [0002] In order to improve the comfort of domestic hot water, many gas water heaters with circulating pumps have been launched on the market in recent years, which can preheat domestic water in advance to reduce the time users wait for hot water when using water. The normal domestic water preheating process is: a semi-open domestic water circulation loop is formed through the domestic water pipeline connection. After receiving the preheating command, the domestic water circulation pump runs to make the water in the domestic water circulation loop start to flow. After the flow in the water circulation loop is greater than the starting flow of the water heater, the water heater starts to burn and heat. Stop preheating when the temperature, water flow and other conditions in the domestic water circulation loop reach the set conditions. The problems ...

AI Technical Summary

Problems solved by technology

[0003] 1. How to identify the opening of domestic water during the operation of the domestic water circulation pump and how to realize the constant temperature control of the water more accurately: When the domestic water circulation pump is working, the user starts to use water. On the one hand, if the water flow is small, it is difficult to judge the opening of the domestic water. On the other hand, if the domestic water circulation pump continues to run during the water use process, the domestic water inlet temperature will gradually increase, and the excessively high inlet water temperature and the constantly changing temperature of the inlet water temperature will make it very difficult to control the constant temperature of the outlet water. Poor experience;

[0004] 2. How to make the water temperature of the domestic water circulation loop uniform after the preheating is completed: After the preheating in the domestic water circulation loop is completed, the general domestic water circulation pump stops running. At this time, the water temperature located upstream of the heat exchanger in the domestic water circulation loop The water temperature in the downstream of the heater is different, which will cause the water temperature in the domestic water circulation loop to be uneven, and there may be a small amount of cold water when using water, which is not good for the user experience

This method cannot solve the aforementioned problems

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