How much is it normal for a car air conditioner to have high and low pressure?

Hello! There are many kinds of units, and kg is one of them. Big cars are not the same as small cars. Changes in ambient temperature can make the pressure different. The speed of the car is different, and the pressure is also different. Teach you a few more tricks to test that the car air conditioner is not normal:

1.The easiest way to turn on the AC is to cool the air conditioner, and the cold air blowing from the air conditioner should be below 10 degrees.

2.Use your hands to touch the high and low pressure pipes of the air conditioner (maybe you can't tell the difference, it doesn't matter) The high pressure pipe should be relatively hot, and your hands can only be placed on it for a while, the low pressure pipe is very cold, and you can see the cold condensation outside the pipe.

3.Test the pressure of the high and low pressure pipes, the high pressure should be 13kg cm2, and the low pressure should be about 2kg cm2.

The greater the heat load, the temperature of the evaporation chamber will rise, and the evaporation pressure will also rise, and the heat load is related to the ambient temperature. The specific steps are as follows: Heat Load:

The higher the heat load, the higher the temperature of the evaporation chamber and the higher the evaporation pressure.

The heat load is related to the ambient temperature, and the hotter the day, the higher the ambient temperature, and the greater the heat load.

Generally, the evaporation pressure (both low pressure) will appear in the hot summer of the low-end car, with the increase of the air temperature, the evaporation temperature also increases, the temperature of the air outlet begins to rise, the driver feels that the air conditioning effect is not good when the weather is cool, of course, for the high-end car with a large enough cooling capacity, this impact is very small.

And the heat load is not transferred by human will. Opening of the expansion valve:

When the suction volume is constant, the larger the opening of the expansion valve, the higher the low pressure pressure.

In the final analysis, the quality of the effect of automobile air conditioning is the size of the refrigeration capacity, and the air outlet temperature is related to the air volume pipe, the evaporation temperature and the refrigeration dose into the evaporation box, etc., and the evaporation temperature is related to the evaporation pressure, when the compressor suction volume is certain (related to the speed), the larger the opening of the expansion valve, the more refrigerant enters the evaporation box, and the refrigerant vapor produced by evaporation can not be quickly sucked away by the compressor to produce a certain low pressure. So only the control of the refrigerant is in a large amount of evaporation, but the evaporation temperature is still high, we can not feel that the air outlet is very cool, from this point of view, the opening of the expansion valve can not be adjusted to a certain low pressure, and the improvement of the refrigeration effect is helpless, but if the opening of the expansion valve is large, the low pressure is too high and the refrigeration effect is poor, then the opening of the expansion valve is smaller? Adjusting the opening of the expansion valve can make the low pressure drop, and the evaporation temperature will drop sharply, and even cause a small area of frost, but because the opening is smaller, the refrigeration dose flowing into the evaporation tank will also decrease, so although the temperature of some evaporation tanks is very low, the evaporation tank on more areas is not cool, and the total refrigeration capacity will not rise.

Working condition of the compressor:

The quality of the compressor directly affects the refrigeration effect.

A friend asked me why the air conditioner works so much better at high speed than at idle! Aside from the windward condenser, the heat dissipation is good.

When the speed increases, the displacement of the compressor increases, causing the high pressure to rise, but whether it is a gate or an expansion valve, it is more or less proportional, that is to say, the gate is a standard proportional tube, the greater the high pressure, the more refrigerant flows through the gate. When the evaporation pressure is higher, the opening of the expansion valve will increase, so that more refrigerant can pass through, and at the same time, with the increase of speed, the suction will become more and more and faster, and then a lower pressure will be formed, so that a large number of refrigerants through the expansion valve will evaporate at a lower temperature, and then the cooling capacity will increase significantly, and everything that happens in the evaporation box will be known. There are many issues that can be explained and adjusted.

The low voltage of the car air conditioner is, and the high pressure is, which are normal values in this range.

For the engine 1500rpm, for R12 or R-134A, the normal working pressure is: the low pressure side is, and the high pressure side is 12 14kgf cm and 15kgf cm2 respectively.

The ratio of the pressure to the area of force on an object is called pressure, and pressure is used to compare the effect of pressure, the greater the pressure, the more obvious the effect of pressure. The formula for calculating the pressure is: p=f s, the unit of pressure is pascal, and the symbol is pa.

The methods of increasing the pressure are: increasing the pressure while the force area is the same or decreasing the force area when the pressure is not the same. The methods of reducing the pressure are: reducing the pressure under the condition that the force area remains the same or increasing the force area when the pressure is not the same.

The high and low pressure of the automobile air conditioning compressor is a variable, which is closely related to the type of compressor, the type of refrigerant and the actual evaporation temperature, the speed of the compressor, the structure of the condenser and the speed of the condensing fan, the opening of the expansion valve, the structure of the evaporator and the speed of the evaporation fan, the temperature inside the car, the temperature outside the car, the engine temperature, the driving speed of the car and other working conditions.

At present, most of the automotive air conditioning systems use R134, and the compressor is a swash plate compressor, with a low pressure pressure of about and a high pressure of about under standard test conditions.

1. Measure the high and low pressure of the air conditioning system, which should be measured when the engine is idling.

2. The normal high-pressure pressure of the automobile air conditioner should be or lbf in2); Normal low pressure pressure should be between or 15-35lbf 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.

3. It should be noted that the pressure of the automobile air conditioner has a lot to do with the ambient temperature (the working environment of the condenser).

The high pressure should be; Low pressure should be in between.

When detecting the high and low pressure of the automobile air conditioner, when the engine increases the throttle, the low pressure should decrease with the speed of the engine, and the faster the speed, the more the pressure will drop (fast).

If it is the opposite, it means that the compressor is faulty. If a chiller uses R22 refrigerant, the corresponding condensation temperature is about 50 degrees Celsius when it is running at high pressure and delay.

Attention should be paid to the use of air conditioning system.

1. The vehicle air conditioning system is basically in a state of suspension in winter, the tightness of the belt should be checked before the initial start, and the engine should be run for a period of time under idle speed, to observe whether the start is normal and check the refrigeration effect during operation, if it is not started or the refrigeration effect is not ideal, it should be checked at the service station.

2. The air code and adjustment system is easy to inhale dust and bacteria during use, so the air conditioning system should be dusted and sterilized once after long-term use to ensure the health of the people in the car.

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 run at idle speed, and the ambient temperature is 35 when the measurement shall prevail. normal high pressure or 190-250 lbf in2), normal low pressure or 20-35 lbf in2). Low pressures above or below this range indicate that the expansion valve is not properly regulated.

If there is a problem with the compressor, it does not fall into this category. When the engine is on the throttle, the measured low pressure should decrease as the engine speed increases, and the faster the speed, the more (faster) the pressure drops. It means that the compressor performance is good, otherwise it means that the compressor is malfunctioning.

This pressure data is for R12 and R134A refrigerants.

Car air conditioner should be at how much pressure is normal.

The high and low pressures of the air conditioning system should be measured when the engine is idling. Normal high pressure is, normal low pressure is.

How to look at the pressure of the car air conditioner pressure gauge, what is the normal one.

Hello! The engine is running at idle speed with a normal high pressure of or 190-250lbf in2 and a normal low pressure of or 20-35lbf in2).

The normal high pressure of the car air conditioner should be (13-17kg cm2 or lbf in2). Normal low pressure should be between (or 15-35lbf in2). Automobile air conditioning as an important component to improve the comfort of car riding has been most of the automobile manufacturers and consumers, at present, in China, the domestic car air conditioning device rate is close to 100%, the gear ratio of other models is also increasing year by year, automotive air conditioning units have become a decisive role in the auto parts.

The drive mode is divided into: 1. According to the independent (engine-driven compressor, the cooling capacity is large, the work is stable, but the cost is high, the volume and weight are large, larger than that of large and medium-sized passenger cars) and the independent (the air conditioning compressor driven by the automobile engine to drive the stool, the cooling performance is greatly affected by the engine work, the stability is poor, and it is mostly used for small trucks and cars) 2. According to the performance of the air conditioner, it can be divided into:

Single-function (the refrigeration, heating, ventilation systems run separately, do not interfere with each other, more suitable for large buses and trucks) and temperature change integrated (share fans and air ducts, refrigeration, heating, ventilation, on the same control board, the work can be divided into warm air and cold air work separately, combined with the temperature rise and quenching and tempering old-fashioned work, can work together at the same time. Cars are mostly mixed tempered). 3. According to the control mode, it is divided into manual (toggle the function keys on the control panel to control the temperature, wind speed and wind direction) and electronic pneumatic adjustment (using vacuum control mechanism, when the air conditioning function key is selected, the temperature and air volume can be automatically controlled within the predetermined temperature).

4. According to the control mode, it is divided into: automatic adjustment (using algorithm comparison circuit, through the work of sensor signals and preset control mechanisms, automatically adjusting temperature and air flow) and microcomputer control automatic adjustment (taking microcomputer as the control center to achieve comprehensive optimal control of the air environment in the car, multi-function and supervision). Bu accompanied.

How much is the high and low pressure of a car air conditioner? How much is the high and low pressure of a car air conditioner? The high pressure of the car air conditioner is normal between 15 and 18 bar, and the low pressure is between to.

The solutions to the high pressure of automobile air conditioning are: 1. Clean the dust and dirt in the air outlet and cab; 2. Regularly check whether the liquid level height of the refrigerant in the air-conditioning system is normal; 3. Check whether the compressor belt is in good condition; 4. Check whether the freezing dose is sufficient and replenish it in time. The solution to the low high pressure of the car air conditioner is:

1. Add air-conditioning refrigerant according to the standard specified by the manufacturer; 2. Repair the leakage status of the air conditioning bending system, and replace the leaking components of the air core training system. The normal high-pressure pressure of the automobile air conditioner should be only 13-17kg cm2 or lbf in2); Normal low pressure pressure should be between or 15-35lbf in2). @2019

The vehicle has an empty high pressure MPA, and a low voltage MPA is normal. If the high or low pressure of the motor vehicle air-conditioning system is abnormal, it is an abnormal situation and will affect the use of the air-conditioning system. How to maintain the air conditioning system requires regular replacement of the empty of the vehicle.

The vehicle has an empty high pressure MPA, and a low voltage MPA is normal. If the high or low pressure of the motor vehicle air-conditioning system is abnormal, it is an abnormal situation and will affect the use of the air-conditioning system.

How to maintain the air conditioning system.

It is necessary to regularly replace the air filter element of the hand vehicle, check whether the compressor refrigerant is insufficient every two years, and clean the air conditioning pipeline of the vehicle once a year, which can be carried out in late autumn or after the air conditioning season to avoid the problem of peculiar smell and mildew in the air conditioning pipeline. Timely cleaning is very necessary and does not affect the use.

How to use the air conditioner.

The first thing to do is to turn on the vehicle, start the vehicle, press the AC switch, the empty start system, adjust the air temperature, the position of the air outlet, and the air volume of the air outlet. It is a good idea to adjust the vehicle's circulation system to the internal circulation, and to switch the external circulation every 30 minutes.

How to distinguish between high and low pressure pipes of automobile air conditioners?

Methods for distinguishing between high and low pressure pipes in automobile air regulations;

Care thickness: The empty air of the car is divided into thick pipes and thin pipes, and the thick pipes are generally low-pressure pipes.

Temperature comparison: The low-pressure pipe is cold to the touch when running, and the thin pipe is the high-pressure pipe and is hot when running.

Introduction: The air-conditioning-device is referred to as the air-conditioning-device.

Role: 3It is used to control the temperature, humidity, air cleanliness and air flow regulation in the carriage in the best state, provide passengers with a comfortable riding environment and reduce fatigue; Ventilation devices that create good working conditions for drivers play an important role in ensuring safe driving.

How much is the high pressure and low pressure of the car air conditioner normal How to distinguish the high and low pressure pipes of the car air conditioner? @2019