Control method and controller for heat pump water heater, and heat pump water heater

Abstract

The invention discloses a control method and a controller for a heat pump water heater, and the heat pump water heater. According to the control method, when the heat pump water heater is subjected to high pressure protection for preset times within preset time, a direct heating mode of the heat pump water heater is stopped, so that a phenomenon that the heat pump water heater is damaged because the heat pump water heater is repeatedly started for direct heating under the condition that external running conditions are not improved during high pressure protection is avoided; and when the level of water in water box reaches the highest water level, the temperature of water body is lower than preset temperature, the heat pump water heater is switched to a circulating heat preservation mode, and then a heat pump is started, so that hot water is available for users.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular to a control method and a controller of a heat pump water heater and the heat pump water heater. Background technique [0002] With the improvement of people's living standards, water heaters are more and more appearing in consumers' lives because they can provide hot water conveniently. Among them, the heat pump water heater uses the heat pump principle to raise the heat energy in the air to a high level of heat energy and heat the water. Because the heat pump water heater has the advantages of energy saving and environmental protection, it has gradually been widely used. [0003] The current heat pump water heater has a direct heating mode and a circulation heat preservation mode. During the operation of the heat pump water heater, when the exhaust pressure in the heat pump exceeds the threshold pressure of the high pressure switch, the high pressure switch is automatically...

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Problems solved by technology

[0004] However, both of the above two methods of controlling the heat pump water heater have defects: the control method of manually restarting the heat pump is selected. If no hot water is produced, there will be no hot water available for users after a period of time; if the controller automatically restarts the heat pump control mode, when the heat pump water heater has a high-voltage protection, the controller will automatically start the heat pump and control the heat pump hot water. If the heat pump water heater is under high pressure protection due to changes in external operating conditions, if the heat pump is repeatedly started before the external operating conditions improve, it will cause damage to the heat pump

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