What's wrong with high-pressure controlled cooling and low-pressure controlled cooling of Gree air conditioning? Hangzhou air-condition maintenance

It may be because the pipeline is blocked, which makes the low-pressure refrigerant flow poorly. It may also be that there is too little refrigerant. Under normal circumstances, there should be a great temperature difference between high and low pressure pipes when air conditioning is used for refrigeration. Because the refrigerant in the high-pressure pipe will give off heat when liquefied, it is hot when touched outside, and it will absorb heat when evaporated in the low-pressure pipe, so it feels very cold. Solution: 1 After starting for a period of time, the air pipe valve has no cold feeling and is dry, indicating that there is a lack of refrigerant in the refrigeration system, the boiling point of refrigerant in the evaporator is advanced, the superheat of refrigerant is increased, and its temperature is higher than the dew point temperature of outdoor air, resulting in dryness. 2. Frost on the valve of the liquid pipe indicates that insufficient refrigerant in the refrigeration system causes the pressure in the liquid pipe to drop, the boiling point to drop, and the valve temperature to be lower than freezing point. 3. There is no thermal sensation in the outdoor unit exhaust. The reason is that the lack of refrigerant leads to the reduction of condensation pressure and condensation temperature. Precautions for filling refrigerant into air conditioner: 1, low pressure is 0.35~0.55Mpa, too high means more increase; If it is too low, it means less increase. It should be noted that the high pressure cannot exceed 2.2Mpa. If the noise is too loud and dull, it may be that more refrigerant is added. If the sound is too low, it means there is not enough. 3. Under normal circumstances, the temperature measurement should be: the suction pipe is cold and has condensation; The exhaust pipe temperature is about 80 degrees; The condenser temperature is about 55 degrees; The compressor suction pipe is cold with dew, and the exhaust pipe is very hot; The temperature of the evaporator is about 65438 05 degrees lower than the ambient temperature.