Freeze prevention control method for heat pump water heater

Abstract

The invention relates to a freeze prevention control method for a heat pump water heater, which uses the heat pump water heater with a freeze prevention controller. The freeze prevention control method is characterized by comprising the following steps of: (1) when the freeze prevention controller detects that the environment temperature is lower than 0 DEG C and the temperature inside a condenser is lower than 3 DEG C, starting a heat tape and a water pump, and when the freeze prevention controller detects that the temperature inside the condenser is higher than 10 DEG C, closing the heat tape and the water pump; and (2) when the freeze prevention controller detects that the water pump is in a closed state, the environment temperature is lower than 0 DEG C and the water inlet temperature is lower than 3 DEG C, starting the water pump, and when the freeze prevention controller detects that the water inlet temperature is higher than 15 DEG C, closing the water pump. According to the invention, when the heat pump water heater is in use in engineering, various information inside the heat pump water heater is identified and simultaneously, whether freeze prevention is carried out is accurately judged by the detected environment temperature, condenser temperature and water inlet temperature, so that freeze prevention and alarm work can be effectively done; and the freeze prevention control method can be matched with a random type of heat pump water heater to carry out freeze prevention and has good universality.

Description

technical field [0001] The invention relates to the field of household water heaters, more specifically, the invention relates to a heat pump water heater with an antifreeze function and an antifreeze control method for the heat pump water heater. Background technique [0002] After many years of market promotion, heat pump water heaters have been widely promoted in the northern market, and the energy-saving properties of the products have been recognized by users. [0003] However, after tracking and understanding the air source heat pump hot water units of different manufacturers in the market, it was found that many users reported that the heat pump hot water was not properly drained and antifreeze due to improper use, resulting in water side freezing and water immersion into the refrigerant system. As a result, the entire unit cannot be maintained, resulting in product scrapping and the like. Described breakdown has become the problem that user, distributor, heat pump f...

AI Technical Summary

Problems solved by technology

However, when running in reverse, the system will absorb heat from the water, causing the water temperature to drop. At this time, if there is scaling or partial blockage inside the water heating heat exchanger, the water in some channels cannot circulate.

Especially when the water temperature is low, as the water temperature gradually drops, freezing may also occur, which will also freeze the heat exchanger, damage the entire unit, and cause serious losses

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