Preheating control method of gas water heater, and gas water heater

Abstract

The invention discloses a preheating control method of a gas water heater, and the gas water heater. The control method comprises a controller, a back water pump arranged on a main water path of the gas water heater, and a return water temperature probe arranged at the water inlet end of the main water path of the gas water heater. The preheating control method comprises the following steps of S1,starting a preheating function; S2, detecting the return water temperature T <return> in real time through the return water temperature probe, and recording the initial pump starting return water temperature T of pump starting of the back water pump through the controller; and S3, judging whether the return water temperature T <return> is larger than the pump starting return water temperature T plus a preheating temperature difference delta T <preheating> or not through the controller; if yes, turning off the return water pump, shutting down and powering off to quit the preheating function; and if not, continuing to keeping the preheating function. Through judging whether preheating is completed or not by monitoring the preheating return water temperature rising amplitude, the preheatingtime can be greatly shortened, and gas consumption is saved; and the preheating waiting time is shortened, and water stored in a water return pipe is prevented from being overheated.

Description

technical field [0001] The invention relates to the technical field of gas water heater preheating, in particular to a gas water heater preheating control method and the gas water heater. Background technique [0002] It has become a trend in the water heater industry to realize instant hot water for gas water heaters. When the preheating function is activated, the built-in return pump operates to drive the external hot water pipes and return pipes to circulate water and realize preheating. [0003] According to the preheating control logic of conventional gas water heaters, in the preheating mode, when the monitored return water temperature is greater than the preset temperature minus the preheating temperature difference (ie T 回 >T 预设 -△T 预热 ), then turn off the return pump to exit preheating. There are following deficiencies in the prior art: [0004] 1. During the preheating process, hot water flows into the return pipe, and the water stored in the return pipe hea...

AI Technical Summary

Problems solved by technology

[0004] 1. During the preheating process, hot water flows into the return pipe, and the water stored in the return pipe heats up, which consumes too much gas and does not save energy;

[0005] 2. The preheating time is too long, and the user waits for hot water for a long time;

[0006] 3. When using the cold water pipe as the return pipe, the cold water pipe will be filled with hot water after preheating, and the hot water will flow out when the cold water is turned on, which will affect the use

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