Can the inverter air conditioner vacuum be pumped to negative pressure in 15 minutes?

Negative pressure can be pumped in 15 minutes, and it is clearly written on the manual that the air conditioner must be fully filled for 15 minutes before the air in the air conditioning pipe can be evacuated.

The inverter air conditioner can be vacuumed, and the negative pressure can be pumped in 15 minutes, and it does not necessarily have to be full of 15.

Fifteen minutes can be pumped to negative pressure, but it does not have to be pumped to fifteen.

It doesn't have to be 15 minutes, depending on the air conditioner's own situation.

It must be full of 15, and it can be used reasonably according to its own arrangement, so as to vacuum.

The inverter air conditioner can be vacuumed, and the negative pressure can be pumped in 15 minutes, and it does not necessarily have to be full for 15 minutes. It can be used reasonably according to your own arrangement, so as to vacuum.

In addition, it is written in the manual that when the air conditioner is vacuumed, it must be pumped for 15 minutes before all the air in the air conditioning pipe can be evacuated. Otherwise, the cooling and heating performance of the air conditioner will be weakened, the consumption will be higher, and the electricity will be more and more. So it only takes 15 minutes for the air conditioner to be vacuumed.

Although the air conditioner must be pumped for 15 minutes, it does not necessarily have to be full for 15 minutes, but the vacuum gauge shows that it is negative pressure. Besides, I use a 2L vacuum pump, which is faster than 5 minutes. I was still a little uneasy, and when I consulted a home appliance repairman, he told me that the length of time of the vacuum pump for air conditioning is uncertain, as long as the vacuum level in the air conditioning duct is less than 10 bar of it, but many owners do not understand this.

In addition, the most important thing is the length of the air conditioning pipe, the size of the number of horses and the size of the vacuum pump. The longer the pipes connected to the inside and outside of the air conditioner, the longer the evacuation time will be. The larger the vacuum pump used by the installer, the shorter the evacuation time.

Usually, when the master installs the air conditioner vacuum, he will use a special pressure gauge, observe the pressure gauge, and move the pointer to a negative number to mean that the air conditioner vacuum is completed. But don't rush to pull out the pipe at this point, but wait 15 to 30 minutes and see if the pointer returns a positive number, if there is no change, pull out the pipe again to avoid unclean situations.

The time of vacuuming should not be less than 20 minutes, preferably more than half an hour.

1.If the air conditioner is not installed in a vacuum, the internal air emptying method of the ordinary air conditioner is adopted, which will change the proportion of refrigerant components, affect the cooling and heating performance of the air conditioner, and consume more electricity. Once the vacuum is not standardized, there will be air in the air conditioning system, which will oxidize and corrode the entire air conditioning system, which may lead to the failure of the air conditioner.

2.If the refrigerant in the machine pipe is in contact with the air, it will freeze after a long time, resulting in the inability of the air conditioner to work.

3.Without vacuuming, the moisture and air mixed into the refrigerant system will cause the compressor oil to deteriorate, making the compressor operation efficiency worse, the current consumption will increase, the pressure will increase, and the noise of the compressor will also increase. Usually after a year, the problem will be obvious.

4.If the installation is not vacuumed, the life of the air conditioner will have a serious impact, and the effect of cooling and heating will also deteriorate, which is equivalent to spending money to buy an unqualified air conditioner.

The continuous evacuation time must reach about 20 minutesThis is the installation requirement of each brand factory. Evacuation is an indispensable procedure when installing an inverter air conditioner with a new refrigerant (R410 refrigerant). In order to ensure that the refrigeration effect can be played normally and the service life of the air conditioner is longer, the vacuum pump must be used to vacuum the air conditioning pipe.

The process of vacuuming is to connect the vacuum pump with the air-conditioning system pipeline to remove non-condensable gases such as nitrogen, oxygen, carbon dioxide and moisture from the air-conditioning system pipeline. Before vacuuming, Xiaoliang must choose a suitable vacuum pump, and the selected vacuum pump requires that the vacuum degree of the system can reach a gauge pressure of -1kg cm2 after vacuuming. Otherwise, if there is moisture in the system, it will damage the compressor, produce a chemical reaction that has an impact on the refrigeration circulation system, and there will also be oxidation of the refrigerant, destruction of electrical insulation, dilution of refrigeration oil, etc.

Therefore, when installing inverter air conditioners, vacuum extraction is a very important procedure, which needs to be operated in strict accordance with the requirements to ensure the normal operation and service life of the system.

Vacuum the inverter air conditioner when it is powered on and in standby mode.

The vast majority of inverter air conditioners use electronic expansion valves, and it is necessary to keep the electronic expansion valve with a fixed and large opening when vacuuming, so as to balance the vacuum degree of each part of the pipeline as soon as possible.

Except for power-on standby, other evacuation operations are the same as those of ordinary fixed-speed air conditioners.

Generally, there is a three-way valve and a two-way valve for the outdoor unit of the household air conditioner, after the air conditioning pipeline is installed, the three-way valve and the vacuum pump are connected with the evacuation pipe, and the vacuum pump is started after the connection is completed, and it is OK to pump for about 10 minutes

1. Drain the air and nitrogen from the pipeline to reach a vacuum state.

2. Vacuum drying, which can remove water in the system.

At one atmosphere, the boiling point of water is 100, but with a vacuum pump, the boiling point decreases rapidly as the vacuum level increases. If the boiling point drops below ambient temperature, the water in the pipe will evaporate.

When the vacuum degree is absolute pressure is OKGF cm. (Gauge pressure is -1kgf cm), the water in the system can be completely evaporated. If there is moisture in the system, there will be chemical reactions that affect the refrigeration circulation system, and the refrigerant will be oxidized, the electrical insulation will be destroyed, and the refrigeration oil will be diluted, which will damage the compressor.

Six steps 1, first confiscate the hexagon wrench of the installation worker. 2. Connect the pipe connecting the inner and outer machines. 3. Connect the pressure gauge to the vacuum pump at the repair port of the three-way valve of the trachea (thick pipe), open the vacuum pump first, and then open the pressure gauge valve, and then pump the pressure to negative MPA after the vacuum starts, and then pump for 15-20 minutes, subject to the negative pressure value of the pressure gauge.

4. Close the pressure gauge valve first, and then close the vacuum pump. Look at the pressure gauge and see if the pressure rises. 5. Return the hexagon wrench to open the liquid pipe valve (thin pipe two-way valve 1 4 turns), close it after about 10 seconds, and use a leak detector or soapy water to detect the position of the connector.

Remove the table, the liquid pipe and trachea valves are all opened, and the debugging machine is opened.

Precautions: a. Remove the air in the connecting pipe and the indoor unit.

b. The boiling point of water in vacuum state is reduced, in order to reduce costs, most manufacturers of internal machines and connecting pipes in China are no longer flushed with inert gas protection, and the water-containing air will enter oxidation and other impurities may adsorb water.

c. The pressure is only to ensure that the air is roughly discharged, and sufficient time is the guarantee of complete removal of water; All connected. It is recommended to open the vacuum pump first, then open the pressure gauge valve, and check the value of the pressure gauge at this time. Evacuation has officially begun.

The suggestion is to pump the pressure negative MPA, and then pump for 15-20 minutes, based on the negative pressure value of the pressure gauge, I put forward the request to pump for half an hour, the installation master's suggestion is to pump as long as possible, as a result, my 35 machine pumped a full 50 minutes, 25 machines finally pumped 35 minutes, during the vacuum installation workers began to fiddle with another 23 machine; Close the pressure gauge valve first, then close the vacuum pump, look at the pressure gauge, and observe whether the pressure rises.