What is the normal pressure of a car air conditioner

x Measure the high and low pressure of the air conditioning system, the engine should be running at idle speed, and the ambient temperature should be measured at 35. Normal high pressure pressure should be or 190-250lbf in2); Normal low pressure should be between or 20-35lbf in2). If the low pressure is higher or lower than this range, it means that the expansion valve is not properly adjusted.

Problems with the compressor are not included in this category.

When the engine increases the throttle, the measured low-pressure pressure should decrease with the engine speed, and the faster the speed, the more the pressure drops (faster). It means that the performance of the compressor is good, otherwise it means that the compressor is faulty.

This pressure data is for R12 and R134A refrigerants.

The normal values of the air conditioning pressure of the car are as follows:1. Refrigerant pressure of automobile air conditioner: in the case of compressor 1500 2000rpm, the high pressure (exhaust pressure) is about MPa, and the low pressure (suction pressure) is normal at about MPa;

2. Under the normal operation of the general air conditioning system, the low pressure is between 15 and 18 bar;

3. The range of the normal value of detecting the pressure of the automobile air conditioner is generally that the high pressure shall not exceed or not be lower, and the normal value range of the low pressure is generally not lower than that which is not higher than the normal range. Low pressures above or below this normal range indicate that the expansion valve is not properly regulated.

The standard pressure for high and low pressure in an automotive air conditioning system is: The automotive air conditioning system cools, heats, ventilates and purifies the air in the cabin. It can provide a comfortable riding environment for passengers, reduce the fatigue intensity of the driver, and improve driving safety.

Air conditioning units have become one of the indicators to measure whether a car is fully functional.

Precautions for the use of automobile air conditioners:

1. Don't keep the temperature low for a long time.

In the process of driving, car owners should also pay attention not to blindly covet coolness, and adjust the temperature of the air conditioner in the car very low. Otherwise, people are prone to endocrine disorders due to too much temperature difference between inside and outside the car, making them more likely to get sick. In addition, turning on the air conditioner temperature very low will also lead to an increase in the fuel consumption of the car and increase the cost of the car.

In fact, under normal circumstances, it is best to have a difference of about 6 between the temperature inside the car and the outside temperature.

2. The temperature of the air conditioner should not be too low.

In summer, many car owners like to adjust the temperature very low, thinking that it is very comfortable, in fact, this is a misunderstanding, because the temperature difference between the inside and outside of the car is too large, which can easily cause the driver to catch a cold, and at the same time, too low temperature may also cause the risk of arthritis to the people in the car. Under normal circumstances, the temperature in the compartment should differ from the outside temperature by 5 to 6 .

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

MPA is normal. 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 700 900 rpm), 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 the highest.

In general, the low pressure is between 15 and 18 bar under the normal operation of the air conditioning system.

The automotive air conditioning and refrigeration system consists of a compressor, a condenser, a liquid storage dryer, an expansion valve, an evaporator and a blower. Copper pipes (or aluminum pipes) and high-pressure rubber pipes are connected into a closed system between the components. When the refrigeration system works, the refrigerant circulates in different states in this closed system, and each cycle has four basic processes.

Maintenance method: Method 1: Inspect the air conditioner thoroughly.

When using the air conditioner for the first time in summer, you should first check the air conditioning system, such as checking whether the refrigerant and air conditioning filter are too dirty through the liquid storage tank, and whether the radiator has foreign objects.

Method 2: Pay attention to the cleaning of the air conditioner.

Some novices always have to wait until the air conditioner is not working well before thinking of cleaning the air conditioner, which is not right. The air conditioner filter should be replaced regularly, because there is more dust in Beijing spring, and the catkins are flying, which will stick to the filter, which is easy to breed bacteria and make the air conditioner produce musty smell.

Refrigerant pressure of automobile air conditioner:

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.

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 MPA, otherwise the pressure switch will be protected.

The low voltage of the car air conditioner is about 2, and the high pressure is about 12. The anomalies are as follows:

1.Low pressure close to 0, low high pressure: expansion valve blockage, temperature sensor bag damage, etc.;

2.Low pressure too high, high pressure too low: there is a leak in the compressor;

3.The low pressure is too high, the high pressure is slightly higher: the condenser is not cooled enough and may be dirty;

4.The low pressure is too high, the high pressure is too high: the expansion valve is too large or there is too much refrigerant;

5.Low pressure, low pressure: insufficient refrigerant or leak detection;

6.Low pressure 0 or negative, high pressure normal or high: there is moisture in the refrigeration system;

7.Low pressure, high pressure: Blockage on the high pressure side.

I won't talk about the brand of refrigerant and compressor oil, you can find it on the Internet. As for the pressure, because it is loaded, it is necessary to follow the pressure of the whole system when it is running, but it is much smaller than that of the monomer, the general car idle speed is about 900 speed of the compressor, the inlet pressure of the condenser is about Pa, the inlet pressure of the expansion valve is about 1m Pa, and the outlet pressure of the evaporator is controlled by the expansion valve, which depends on the opening of the expansion valve. (There is an opening, of).

When the car is running at a medium speed of 70-80 yards, the compressor speed is about 1800, and the refrigerant will be added from the liquid storage tank, so the pressure will rise a little, probably in Pa, mainly the condenser here, because the windward wind speed increases, the heat dissipation increases, so the pressure becomes higher. As for the high-speed driving speed of 3600, the refrigeration with a large wind speed should be possible, and the pressure is in Pa. The refrigerant will leak slightly in the pipeline for a long time, not that there is no leakage if the leakage is not found, but also that the air conditioning time is used for a long time, and the oil content of the refrigerant in the pipeline system will also increase, so it is necessary to change the refrigerant and compressor oil.

Generally, it is possible to add it once a year and replace it all.

The pressure at the high-pressure end is generally, and the pressure at the low-pressure end is.

Generally, the pressure of the car air conditioner is low, and the high pressure is 15-18 bar (215-260 psi).

When the automotive air conditioning and refrigeration system is working, the high and low pressure side pressures in the system have a normal working range.

What is the standard pressure range in an automotive air conditioning and refrigeration system.

Low pressure approx., i.e. pressure, high pressure approx., i.e. pressure of 15-20kg. The low pressure is due to the fact that there is an evaporator's expansion valve that throttles the flow and reduces the pressure of the refrigerant, resulting in a reduction in the temperature of the refrigerant, and then the heat exchange between the refrigerant and the air in the cockpit achieves the purpose of cooling. The reason why the high pressure is high is that on the one hand, it is to increase the pressure and pave the way for the low pressure throttling, and on the other hand, it is to make the car judge a better heat exchange for the condenser.

And if the general low pressure of the car air conditioner is lower than the pressure, the refrigeration system will stop running. If the pressure exceeds kilograms, the refrigeration system stops working. This is controlled by a pressure switch in the refrigeration system.

What is the normal pressure of the low pressure and high pressure of the car air conditioner.

Good friend, the low-end pressure of the general automobile air conditioning system should be, the high-pressure pressure is, I hope you can be satisfied, thank you, good mood.

What is the normal pressure of a car air conditioner

1.When the compressor is running at 1500 2000rpm, the high pressure (discharge pressure) is and the low pressure (suction pressure) is. It depends on how well the air conditioning system matches the ambient temperature of different vehicles.

At idle speed (700 900 rpm), if the ambient temperature is high, such as in direct sunlight in summer, the high pressure may be slightly higher, which can be reached.

When the air conditioning system is operating normally, the low pressure is 15 18 bar. The normal range of automobile air conditioning pressure detection is generally not greater than or less than, while the normal range of low pressure detection is generally not less than or greater than that, which belongs to the normal range. The low pressure is higher or lower than the normal range, and the expansion valve is not adjusted properly.

Extended data: The evaporator and fan of the automobile air conditioner are in a closed and dark state for a long time, and the internal environment is high humid. Impurities, dust, bacteria, viruses, etc. in the air enter the inside of the air conditioner, combine with condensate, and clog evaporators and other components.

After years of accumulation, a large amount of dust, nicotine, mold, fungus, etc. were adhered to. Some car owners rarely or never air conditioner to loud because they don't like the noise made when the air conditioner is in high gear. But when using the air conditioner, it will suck in a lot of dust, and the dust on the surface of the air conditioner duct can be blown out regularly.

It's an easy way to keep your aircon clean. In addition, it is necessary to use a special duct cleaning solution for sterilization, cleaning and deodorization. Clogged expansion valves or orifices are the most common phenomenon.

When the system is dirty, the desiccant (silica gel) in the reservoir filtration dryer ruptures, and the high-pressure refrigerant liquid flows into the expansion valve or orifice tube, which can easily form a blockage in the narrow channel. This causes an abnormal liquid supply and prevents the system from operating normally. References:

Car Air Conditioning Pressure - Encyclopedia.