What's with the cold air from the air conditioner in winter?

At the beginning of heating, there is no air coming out of the indoor unit, and it needs to be preheated to a certain temperature (the evaporator of the indoor unit is preheated to about 25 degrees) to blow hot (warm) air. Because air conditioning is the principle of air compressor, the low-pressure vapor of refrigerant in refrigeration system is sucked by compressor, compressed into high-pressure vapor and discharged into condenser. Heat pump heating uses the compression condenser of refrigeration system to heat indoor air, so it will blow out some cold air at first. /kloc-after 0/5 minutes, if the temperature is still not high or cold, it proves that there is something wrong with the air conditioner, and 90% of it is refrigerant leakage.

Defrosting process

Please make sure that the heating setting is correct. The machine will start and stop when it reaches the set temperature, which can save electricity. In winter, when the air conditioner is heating, there will be a defrosting process. When defrosting, the internal fan (external fan) stops working, turns on again after defrosting, and the heating operation automatically resumes.

Power failure of four-way valve

At this time, outdoor heating, indoor refrigeration and defrosting began, and the indoor unit coil has not yet fallen to the standard of preventing cold air, and the indoor unit continues to supply air. At this time, when the wind is lower than room temperature, it will feel very cold, but the indoor opportunity will not run away soon.

Air conditioning fault

Excluding the above reasons, the problem may be that there is no load during CT coil open circuit protection or detection. The fault is preliminarily judged as compressor not running or CT current transformer detection circuit of outdoor computer board is damaged, and outdoor computer board needs to be replaced or outdoor EEPROM has problems. Outdoor EEPROM fault alarm is mostly due to the damage of the program integrated circuit of the outdoor computer board, which requires special maintenance personnel.