Control method for air conditioner capable of low-temperature refrigeration

Abstract

A control method for an air conditioner which can perform low-temperature refrigeration is characterized in that an external fan is shut down to reduce heat exchange when that an indoor coil pipe is lower than a temperature value T<1> for a time duration t<1> is detected and a compressor operates continuously for more than t<y1>; the compressor is shut down and an internal fan operates according to a preset wind speed to perform anti-freezing protection when the indoor coil pipe is lower than a preset temperature value T<2> for a time duration t<2> and the compressor operates continuously for more than t<y2>; the whole set returns to normal operation when the indoor coil pipe is higher than a temperature value T<3>, and the external fan and the compressor are started, so that the air conditioner can refrigerate normally at a low temperature. The inventive method is simple and no other hardware is needed. The air conditioner can be started at a low temperature without basically changing indoor heat exchange effect and low-temperature refrigeration ability.

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-t...

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.