Control method for air conditioner capable of low-temperature refrigeration

Abstract

A control method for an air conditioner capable of low-temperature refrigeration, characterized in that the function of using an indoor coil temperature sensor to detect the coil temperature detects that the indoor coil is lower than a certain temperature value T1 for a duration of t1, and the compressor continues to run for a time ty1 Above, stop the operation of the external fan to reduce heat exchange; when the indoor coil is lower than a certain temperature value T2 for a duration of t2, and the compressor continues to run for more than ty2, the compressor is turned off, and the internal fan runs at the set wind speed. Anti-freeze protection; when the indoor coil is higher than a certain temperature value T3, the whole machine will resume normal operation, and the external fan and compressor will be turned on, so that the air conditioner can normally cool under low temperature conditions. The method is more convenient, does not require additional hardware, and can be started at low temperature, so that the indoor heat exchange effect and the low-temperature refrigeration capacity are basically unchanged.

Description

technical field [0001] The invention relates to an air conditioner control method, in particular to an air conditioner control method capable of low-temperature refrigeration. Background technique [0002] Traditional air conditioners can only operate normally when the ambient temperature is above 10°C, while cooling below 10°C will use the indoor evaporator to frost or freeze in a large area, and even the copper tube of the evaporator may burst due to freezing, not only cooling The effect is poor, and there are also safety problems. As for the special requirements of some countries or special regions, the indoor temperature is 20°C-30°C, and the outdoor temperature is -5°C-5°C, which requires normal cooling. However, traditional air conditioners must have the above-mentioned problems when operating under such harsh working conditions. [0003] Although the Chinese patent No. 200510015944.7 "Patent Air Conditioner Low-temperature Environment Starting Method" discloses a low...

AI Technical Summary

Problems solved by technology

It needs to control the parameters according to the indoor piping temperature, outdoor piping temperature and the fan speed of the outdoor unit of the air conditioner to achieve low temperature start-up. There are many detection parameters and the control method is not simple enough.