Control method and control device of heat-pump water heater and heat-pump water heater

Abstract

The invention discloses a control method and control device of a heat-pump water heater and the heat-pump water heater. The control method includes the steps of S10, detecting whether a main temperature sensor in a water tank breaks down or not, executing the step S11 if the main temperature sensor does not break down, executing the step S12 if the main temperature sensor breaks down, S11, judging whether the starting condition of a heat pump main machine is met or not according to the water temperature sensed by the main temperature sensor, executing the step S12 if the starting condition of the heat pump main machine is met, executing the step S10 if the starting condition of the heat pump main machine is not met, S12, starting a water pump in a circulation water route for a certain preset time in a continuous mode, S13, judging whether the starting condition of the heat pump main machine is met or not according to the water temperature sensed by an auxiliary temperature sensor, executing the step S14, if the starting condition of the heat pump main machine is met, executing the step S10 if the starting condition of the heat pump main machine is not met, and S14, starting the heat pump main machine to conduct heating. According to the control method of the heat-pump water heater, water temperature detection deviations caused by abnormal reasons can be effectively removed, the heat pump main machine can be normally started and stopped, and water utilization of a user is guaranteed.

Description

technical field [0001] The invention relates to the technical field of water heater control, in particular to a heat pump water heater control method, a control device and the heat pump water heater. Background technique [0002] In the existing heat pump water heater, the heat pump host and the water tank are connected by pipelines to form a circulating waterway, and a water pump is installed in the circulating waterway. When the heat pump host is used to heat the water, the water pump is turned on to make the water in the water tank pass through the heat pump host repeatedly. And make the water temperature rise of whole box water reach setting temperature. At present, the start and stop of the heat pump main engine is generally controlled by detecting the change of the water temperature in the water tank. When the water temperature is lower than the preset value, it will be turned on, and when the water temperature reaches the set temperature, it will be turned off. The m...

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Problems solved by technology

The method used by the existing heat pump water heaters to detect the change of water temperature in the water tank is to place a temperature sensor in the water tank to detect the change of water temperature in the water tank in real time and control the start and stop of the heat pump host. Although this control method is simple and easy Yes, but it also has its disadvantages: 1. The temperature sensor needs to be installed in the water tank by after-sales installers on site. The installation is not standardized and the reliability is not high. When the deviation of water temperature detection is caused, it will lead to abnormal start and stop, such as frequent start and stop; hot water available

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