Air conditioning is one of the appliances in our home. It brings us cool in the summer and warmth in the winter. However, in the process of using air conditioners, there are occasions when the air conditioner is not cooled, which is very distressing. So what is the reason for the air conditioner not cooling ? What is the maintenance method? Next, the decoration home network Xiaobian to introduce one by one, for air conditioning users reference.
First, the reason why the air conditioner does not cool
1. Freon is not enough
When the ambient temperature is about 35 degrees Celsius, the low pressure is 0.45MP2, the high pressure is 2.5MP or more, and the static pressure is 1.1-1.2MP. This is a normal situation, and it usually occurs in an old air conditioner that has been used for three to four years. The air conditioner did not completely cool, but the cooling effect was reduced. This is because old-fashioned air conditioners use Freon as a refrigerant and will evaporate for a long time.
2, the supply voltage is not enough
The normal starting voltage of the air conditioner is 220V+-10%. In China's power supply system with phase voltage of 220V and line voltage of 380V, almost all compressors above 200V can be started. When it is above 180V, 70-80% can be started. When it is above 160V, only individual can start. I personally did experiments. It is almost impossible to start below 160V.
3, air conditioning power is not enough
The general selection principle is: 150-250W/m2 for cooling and 250-350W/m2 for heating. In addition, factors such as space height, directional orientation, sealing performance and resident population should be considered.
Second, the air conditioning does not cool the maintenance method
1. Sensory inspection method:
(1) Compressor operating status:
1 Whether the transmission belt is broken or slack If the transmission belt is too loose, it will slip, accelerate the wear and not transmit power.
2 There is noise inside the compressor.
Noise can be caused by damaged internal parts and internal wear cannot be effectively compressed.
3 Whether the compressor clutch is slipping.
(2) condenser and fan status:
1Condenser fins are covered by dust
If the condenser fins are covered by dust, the efficiency of the condenser will be greatly reduced.
2The condenser fan is working well.
(3) Blower fan operating status
The fan is operated at the "low, medium and high" speeds. If there is abnormal noise or the motor is running poorly, it should be repaired or replaced, otherwise the supply airflow will be insufficient.
(4) Inspection of refrigerant liquid volume
1 If a large number of bubbles are seen through the observation window, the refrigerant is insufficient. If water is poured into the condenser and allowed to cool, no foam is observed in the observation window, indicating an excess of refrigerant.
2 Check the joints and joints of each device for oil stains
If there is oil on the joint or seam, indicating that there is refrigerant leakage, re-solidify or replace the parts.
2, instrument detection method
This method uses a complete set of snow pressure gauges to locate the fault location. First, close the high pressure end and low pressure end switch of the pressure gauge. In the stop state, connect the refrigerant filling hose to the corresponding service valve of the compressor, and use the refrigerant pressure in the refrigeration unit to discharge the air in the hose. . At this time, the high and low pressure end readings should be in equilibrium (about 6kg/cm2) to start the engine, maintain at 150rpm, the blower speed is set at the highest level, and the cold air is set at the maximum position, in the "recycle" state. The normal reading is:
Low pressure end: R-134a 1.5-2.5kg/cm2 14-16kg/cm2
High pressure end: R-12 1.5-2.0kg/cm2 13-15kg/cm2
Through the above introduction, we must have a certain understanding of the reasons and maintenance methods of air conditioning. If you want to know more about the reasons why air conditioners are not cooling, please continue to pay attention to the decoration home network.
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