Control method and control system for high-temperature protection of air conditioner internal unit

Abstract

The invention relates to a control method for high-temperature protection of an air conditioner internal unit. The control method comprises the following steps: comparing a first coil pipe temperature T1 with a first preset temperature value Ta or comparing a first exhaust pressure value P1 with a first preset pressure value Pa; when T 1 is higher than Ta or P1 is more than Pa, stopping running of the outdoor blower; comparing a second coil pipe temperature T2 with a second preset temperature value Tb or comparing a second exhaust pressure value P2 with a second preset pressure value Pb; when T2 is less than Tb or P2 is less than Pb, adjusting the indoor blower to the highest gear; comparing a third coil pipe temperature T3 with a third preset temperature Tc or comparing a third exhaust pressure value P3 with a third preset pressure value Pc; when T3 is more than Tc or the P3 is more than Pc, stopping running of a compressor. Before unloading the compressor, the control of unloading the blower and compulsively running the motor of the inner unit to the highest wind gear is increased; thus the system pressure is effectively reduced, the start-stop frequency of the compressor is reduced, and the reliability of the system is improved.

Description

technical field [0001] The invention relates to the field of air conditioner control, in particular to a control method and system for high temperature protection of an air conditioner internal unit. Background technique [0002] When the air conditioner is running for heating in the transitional season when the indoor and outdoor ambient temperature is around 20°C, especially when the wind is low, the evaporation temperature is high, and the system pressure will reach the limit value. It is very high, which makes people feel uncomfortable and even burns. In terms of user comfort and system reliability, it is necessary to control the temperature of the heat exchanger of the internal unit. At present, the industry often uses the method of stopping the compressor to unload, but the frequent start and stop of the compressor will cause compression The lack of oil and insufficient superheat will not only cause vibration and noise problems, but more importantly, shorten the servi...

AI Technical Summary

Problems solved by technology

[0002] When the air conditioner is running for heating in the transitional season when the indoor and outdoor ambient temperature is around 20°C, especially when the wind is low, the evaporation temperature is high, and the system pressure will reach the limit value. Very high, making people feel uncomfortable, even burns

In terms of user comfort and system reliability, it is necessary to control the temperature of the heat exchanger of the internal unit. At present, the industry often uses the method of stopping the compressor to unload. However, the frequent start and stop of the compressor will cause compression The lack of oil and insufficient superheat will not only cause vibration and noise problems, but more importantly, shorten the service life of the compressor and affect the reliability of the system

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