What is the highest vacuum pressurization of a car air conditioner?

Refrigerant Pressure Standards for Automotive Air Conditioners – Introduction.

The so-called automotive air conditioning refrigerant is what is commonly referred to as freon, which is also called "refrigerant" or "refrigerant" in the market, and is divided into environmentally friendly (R134A) and non-environmentally friendly (mainly F12). Refrigerant pressure gauges are also called refrigerant gauges or fluorine gauges. It is used to measure the current pressure of the refrigeration system, which is mainly used to detect the pressure value of the refrigerant at different stages of the system, and the operation status of the equipment is supported by the user.

1.In the case of compressor 1500 2000rpm, the high pressure (discharge pressure) is about MPa, and the low pressure (suction pressure) is about MPa. It depends on the matching of the air conditioning system and the ambient temperature of different vehicles.

2.In the case of idle speed (engine 700 900rpm), if the ambient temperature is high, such as in the case of direct sunlight in summer, the high pressure may be slightly higher, up to about MPa, but generally not more than MP.

Automotive air conditioner refrigerant pressure standard - how to judge whether refrigerant is added.

Under normal circumstances, 3-5 years old cars do not need to add refrigerant, but sometimes the refrigerant effect is not good.

Method 1: After the air conditioner is turned on normally for a period of time, the wind blowing on the body feels very cool and can quickly reach the set temperature, and the outdoor compressor can be like a refrigerator. Working for a while and stopping for a while is an indication that it is normal, otherwise there is a risk that refrigerant may be required.

Method 2: Use a thermometer to measure the temperature difference between the inlet and outlet of the indoor unit, the greater the normal temperature difference above 8, the better the working condition of the air conditioner can reach about 15, and the difference below 8 may need to add refrigerant.

Method 3: Open the panel of the indoor unit after ten minutes of start-up, you should see that the copper pipe of the evaporator is covered with aluminum sheets for heat exchange, and the parts are evenly covered with condensate, so that when the air humidity is large, there is more and less on the contrary, if half of the half is not, it may be a lack of refrigerant. If there is local frost or ice, it is also abnormal.

Method 4: Users who have used it for more than half a year can check whether there are obvious signs of oil leakage at the pipe joints of the indoor unit and the valve of the outdoor unit, and if there is obvious oil leakage, it indicates that the machine has leakage, because the oil and fluorine are miscible and the oil must leak fluorine, and the fluorine leakage must leak oil.

Automotive Air Conditioner Refrigerant Pressure Standard - How Much to Increase is Appropriate.

Generally, the car is marked with how many grams are added, 300 grams to more than 600 grams, generally three or four bottles of refrigerant are also added to five or six bottles, mainly to see the pressure gauge, the air conditioner is turned on, when the compressor is working, the high pressure is about 200, and the low pressure is about 20-30. If the refrigerant is sufficient, then why doesn't the air conditioner refrigerate? Probably:

Insufficient refrigerant, refrigerant leakage, non-condensable gas or too much refrigerant in the system, clogged filter screen of liquid storage tank and dry gas, clogged expansion valve screen, excessive oil content of the system, failure of control valve (variable displacement) or internal leakage, clogged pipeline.

In the case of compressor 1500 2000rpm, the high pressure (discharge pressure) is about MPa, and the low pressure (suction pressure) is about MPa.

Car air conditioners have lip seals, and their main function is to prevent leakage. In general, it can withstand an internal high pressure of 30 bar. However, for internal vacuuming, it is only required that there is no leakage under the condition of 1 bar difference between the inside and outside pressure.

That is, the outside is 1 atmosphere higher than the inside). If there is no internal pressurization, decompression. Then use the external 2 atmospheres to detect.

Note: The lip seal design cannot withstand external high pressure.

When vacuuming, because the pressure is getting lower and lower, the water is gradually vaporized into steam and is pumped out, the process is relatively slow, and the vacuum generally takes more than half an hour.

Automobile air conditioner pumping is really bad and shouting empty, generally used with vacuum pump and automobile air conditioning manifold pressure gauge

1. Connect the high and low pressure hoses of the manifold pressure gauge to the high and low pressure side sock sail valve valves respectively (blue, low, red and high), and connect the middle hose with the vacuum pump.

2. Open the high and low pressure manual valves on the manifold pressure gauge, start the vacuum pump, and observe the pointer of the low pressure gauge, there should be a vacuum display.

3. After 5 minutes of continuous pumping, the low pressure should reach 30kpa, and the high pressure pointer should be lower than zero, if the high pressure gauge pointer is not lower than zero, indicating that there is a blockage in the system, the vacuum should be stopped, and then the vacuum should be repaired.

4. After the vacuum pump works for 15 minutes, the pointer of the low pressure gauge should be 10-20kpa. If the hail value is not reached, the high and low pressure manual valves should be closed, and the pointer of the low pressure gauge should be observed.

5. When the system pressure is close to the vacuum, close the high and low pressure manual valves and keep the pressure for 5-10 minutes. If the pointer of the low pressure gauge does not move, open the high and low pressure manual valves to open the vacuum pump, and continue to vacuum, and the vacuum time shall not be less than 30 minutes.

6. At the end of vacuuming, close the high and low pressure manual valves first, and then close the vacuum valve system, so that the refrigeration oil or refrigerant can be filled into the system.

Photo by Tang Yanyan) NIO ES8 NIO ES6 Wenjie M5 NIO EC6 Xpeng P7 Trumpchi GS8 @2019

Automobile air vacuum, air pumping, high and low pressure. When the evacuation is empty, the water gradually vaporizes into steam and is pumped out, which is a slow process, whereas the evacuation usually takes more than half an hour.

Automobile air pump air pump and automobile air manifold pressure gauge are generally used together:

1.Connect the high-pressure and low-pressure hoses of the manifold gauge to the high-pressure and low-pressure side valves (blue low-pressure and red high-pressure), respectively, and connect the intermediate hose to the vacuum pump.

2. Open the high and low pressure manual valve on the manifold pressure gauge, start the vacuum pump, and observe the low pressure gauge pointer. There should be a vacuum display.

3.After 5 minutes of continuous pumping, the low pressure should reach 30kpa, and the high pressure indication should be lower than zero. If the high voltage indicator does not fall below zero, it indicates that the system is clogged. Stop the pump and stop the empty, repair the empty and then pump again.

4.After the vacuum pump works for 15 minutes, the low pressure gauge pointer should be 10-20kpa. If this value is not reached, close the high and low pressure manual valve and observe the pointer of the low pressure gauge.

If the pointer rises, it means that there is a loss of real space and a leak in the system grip. Solid-air sampling should be stopped and repaired before real-space sampling can be continued.

5.When the system pressure is close to the vacuum, close the high and low pressure manual valves and hold the pressure for 5-10 minutes. If the pointer of the low pressure gauge does not move, open the high and low pressure manual valve to start the vacuum air pump, and continue to vacuum the air for at least 30 minutes.

6.At the end of the vacuum, close the high and low pressure manual valves first, and then close the vacuum air valve system, so that the system can be filled with refrigerant oil or refrigerant.

Millions of car purchase subsidies.

Connect with air conditioner high pressure gauge, air conditioner compressor. High and low pressure valves. Vacuuming. After vacuuming. Add air conditioner lubricating oil. Then open the low-pressure valve. Reverse pumping freon into the air conditioning compressor.