A protection control method for air-conditioning heating low-voltage switch

Abstract

The invention relates to an air conditioner heating low-voltage switch protection control method. In the air conditioner heating mode, by detecting the outlet temperature of an outdoor heat exchanger, different low-voltage protection control methods are adopted for different outlet temperatures. By means of the method, the action of a low-voltage switch can be accurately judged in time, protection, free of missing alarms, false alarms and delayed alarms, of the low-voltage switch is conducted, and therefore the service life of an air conditioner is prolonged.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to an air conditioner heating low-voltage switch protection control method. Background technique [0002] During the heating operation of the air conditioner, the refrigerant exchanges heat with the outdoor air through the outdoor heat exchanger, absorbs heat from the outdoor air and evaporates, and the compressor compresses the low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant vapor, which enters the indoor heat. The heat exchanger releases heat, and heat is released through the indoor heat exchanger to heat the indoor air, so that people can enjoy a more comfortable environment. However, in the low-temperature heating mode of the air conditioner, the low pressure is relatively low, and the air conditioner is prone to low-voltage protection failures. Therefore, the prior art discloses a control method for the low-voltage switch disconne...

AI Technical Summary

Problems solved by technology

However, in the low-temperature heating mode of the air conditioner, the low pressure is relatively low, and the air conditioner is prone to low-voltage protection failures. Therefore, the prior art discloses a control method for the low-voltage switch disconnection protection in the heating mode, that is, the compressor starts in the heating mode. Or after the heating compressor is started after defrosting, within 5 to 10 minutes of compressor operation, the low-voltage protection is shielded, that is, the low-voltage switch does not work. Although this method can effectively control the low-voltage switch to be disconnected in the heating mode to achieve low-voltage protection , but there are the following defects: when heating at low temperature, the unit does not leak liquid and lack fluorine, the low-voltage switch is disconnected, and the low-voltage switch is reported for protection, that is, it is prone to false alarms; when heating at high temperature, the unit has leaked liquid and lacks fluorine, The low-voltage switch disconnection protection is reported when the compressor runs for 5-10 minutes, and the low-voltage switch protection is not timely

[0003] In the prior art, when the heating mode compressor is started or the heating compressor is started after defrosting, the temperature value of the defrosting temperature sensor is also used as the judgment of the low-voltage switch disconnection protection, that is, when the temperature of the defrosting sensor is higher than a certain When the temperature reaches a certain value, the low pressure switch will be disconnected within 5 to 10 minutes after the compressor starts running, and the low pressure protection will be reported; It effectively protects the compressor, but it also has the following defects: when the temperature of the defrosting temperature sensor is lower than a certain value during low-temperature heating, the unit has leaked liquid and lacks fluorine, and the low-voltage switch is disconnected, but it does not report low-voltage protection, which is easy There is a problem of underreporting; when heating at high temperature, the unit has leaked liquid and lacked fluorine, but it takes 5 to 10 minutes for the compressor to run before reporting the low-voltage switch disconnection protection, that is, the protection of the low-voltage switch is not timely. Therefore, air conditioning is required Further improvement of the control method for controlling low voltage switch protection in thermal mode

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