A zero-cold water preheating device for a gas-fired heating water heater and its control method

Abstract

The present invention provides a zero-cold water preheating device for a gas-fired heating water heater capable of realizing the zero-cold water function and a control method thereof. The control method includes steps such as startup, temperature detection, cycle heating, low-temperature heating, and constant-temperature heating. The preheating device includes a water return pipe arranged between the water inlet pipe and the water outlet pipe of the furnace body. The water return pipe is provided with a water return pump for returning the water in the water outlet pipe to the furnace body for heating. The main controller electrically connected to the water pump, the water flow sensor and the gas proportional valve electrically connected to the main controller respectively, and the preheating switch electrically connected to the main controller is provided on the furnace body to start the preheating cycle program of the main controller , a temperature sensor is installed on the outlet pipe to sense the temperature of the water in the outlet pipe and transmit the corresponding data to the main controller. The main controller is used to calculate the required load and control the gas proportional valve according to the water flow data and water temperature data. The opening and control of the work of the backwater pump.

Description

【Technical field】 [0001] The invention relates to the field of gas heating water heaters, in particular to a zero cold water preheating device for gas heating water heaters and a control method thereof. 【Background technique】 [0002] At present, the state of the bathroom of gas heating water heaters on the market is instant heating. After turning on the faucet, the machine burns and heats the bathroom water, but there is unheated cold water in the pipeline between the machine and the environment where it is used, which cannot be used immediately. It is necessary to wait for the hot water to flow out and the cold water to be completely drained before it can be used, resulting in hot water waiting and waste of water resources. [Content of the invention] [0003] The technical problem to be solved by the present invention is to provide a kind of zero cold water preheating for gas heating water heaters that can preheat the unheated cold water in the pipeline between the machi...

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Problems solved by technology

[0002] At present, the gas-fired heating water heaters sold in the market are instant heating. After the faucet is turned on, the machine burns and heats the bathroom water. However, there is unheated cold water in the pipeline between the machine and its use environment, which cannot be used immediately. It is necessary to wait for the hot water to flow out and completely discharge the part of the cold water before it can be used, resulting in waiting for hot water and waste of water resources

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