What is the reason for the high pressure of the air conditioner, and what is the cause of the high p

The following are the reasons why the high pressure of car air conditioners is on the high side:1. If there is air in the system, it should be completely evacuated and filled with refrigerant.

2. The system is blocked, mostly expansion valves.

In the event of a blockage or malfunction, the expansion valve should be replaced.

3. Excessive refrigerant, manifested as the exhaust port feels "hot", the suction port feels "hot", and the compressor is occasionally accompanied by the sound of liquid hammering, so it should be completely evacuated and refilled with refrigerant in a quantitative manner.

4. a condenser.

The heat dissipation is not cool, and the temperature of the pipeline from the outlet of the condenser to the inlet section of the expansion valve is "hot".

5. The expansion valve fails, which is manifested as a large amount of dew or frost in the low-pressure pipe. The high pressure is due to the fact that the gaseous refrigerant cannot be completely converted into liquid to reduce the volume, and the high temperature and high pressure gas of the compressor is continuously discharged.

Hello:— 1. The refrigeration system of the air conditioner is circulating, bounded by the capillary pipe (or expansion valve), and distinguishing between high-pressure pipelines and low-pressure pipelines.

2. When the air conditioner is running, it appears.

Low pressure, low pressure, high pressure".

The phenomenon is generally that the capillary (or expansion valve) is not blocked (such as dirty or ice blockage) and the filter drier is not blocked.

3. The difference between ice plugging and dirty plugging is: the pressure when the ice plug is faulty is good and bad, while the pressure of dirty plugging will not change.

How to repair the protection of air conditioning and refrigeration system from excessive pressure?

The high-pressure protection of the air conditioning and refrigeration system can be caused by different reasons, and the maintenance methods are also different: the cooling system has too high a cooling dose, resulting in too high suction pressure.

Maintenance method: Drain the excess refrigerant and troubleshoot. Reason:

The refrigerant in the refrigeration system mixes with the air, which can also cause the suction pressure to be too high.

Maintenance method: The refrigerant should be released and replenished, and the problem can be solved. Reason:

During the compression process of the compressor, the low-pressure valve disc and valve disc are closed abnormally, and leakage occurs, resulting in the confluence of high and low pressure, resulting in excessive suction pressure. Maintenance method: Open the compressor grinding valve plate.

4 reason: the expansion valve throttling air conditioner for refrigeration cycle, because the throttling flow adjustment of the expansion valve is too large, resulting in too high suction pressure. Maintenance method: The opening of the expansion valve can be adjusted appropriately.

Air conditioning refrigeration principle:

After the regulator is energized, the low-pressure steaming of the refrigerant in the refrigeration system is sucked into the compressor and compressed into high-pressure steam and sent to the condenser. At the same time, the outdoor air drawn in by the axial fan flows through the condenser, taking away the heat released by the refrigerant, and condensing the high-pressure refrigerant vapor into a high-pressure liquid.

After the capillary throttling pressure is reduced, it is cooled into the evaporator, and evaporates under the corresponding low pressure to absorb the surrounding heat. At the same time, the cross-flow fan continuously feeds the air into the evaporator fins for heat exchange, and sends the exothermic cold air to the room. In this way, the indoor air continues to flow in a ring to achieve the purpose of cooling.

Clean the lower condenser frequently, or adjust the expansion valve.

There are several kinds of hot and high-pressure protection in cold storage:

1. The condenser is not cleaned and maintained frequently, and many smart people are cleaned and maintained in time before the hot weather, but many people are lazy and trouble-free.

As a result, as soon as the weather is hot, there is a problem.

2. The protection value of the high-pressure switch is too small (some of the high-pressure switches are set to the actual high temperature in summer, sometimes exceeding the high temperature, and the end of the defrosting is just turned on)) or the pressure switch is aging.

3. Is the unit matching reasonable? Is the cold storage load too large?

4. Too much refrigerant.

I don't know if you are talking about the front or back of the valve, the high temperature library or the low temperature warehouse?

The evaporation temperature of the valve body is dozens of degrees below zero, so it is strange that there is no frost?

Generally, the expansion valve is semi-frosted.

As for the ice plugging, you only have to look at the low pressure and compressor current to tell it. It's really blocked, the compressor is equivalent to our usual fluoride, and the pressure will be lower than usual, because the low-pressure pressure must be lower than usual.

Expansion valve frosting is.

The ice is blocked, and the cold storage is always shut down when it is hot at noon.

1. Check whether the high-voltage heat dissipation is good, such as whether the heat dissipation of the external unit is obstructed, etc.

2. On the other hand, check the ice plugging and dirty blockage, because the blockage compression will always hit the high pressure... And because the high pressure is blocked, it will not be sprayed to the low pressure, and after a long time, it will all be at the high pressure, and the high pressure compression will stop.

The high-pressure pressure of the automobile air conditioner is too high:

1. Too much refrigerant. Solution: Release part of the refrigerant or all of it and refill.

2. Excess refrigeration oil. Solution: Release all the refrigerant, use the machine to suck out the excess refrigerant oil, and refill the refrigerant.

3. The condenser does not dissipate heat well. Treatment method: clean the surface stains of the condenser and the condenser pipeline; Check the cooling fan, the cooling fan generally has 2 gears, high speed and low speed, to see if there is high speed. If the condenser is poor in heat dissipation due to aging, it is recommended to replace it.

4. The opening of the expansion valve or expansion pipe is too small. Solution: Replace the expansion valve or expansion pipe, and at the same time thoroughly clean the air conditioning pipeline, and replace the drying bottle with a piece; If it is an air conditioning system with a flow controller, replace the flow controller, and if the flow controller is on the compressor, replace the compressor, such as Buick Excelle.

PS: If there are other situations, it will be dealt with according to the situation.

In the case of normal operation of the air conditioner, the low pressure is about 3bar, the high pressure is about 15bar, pay attention to the normal operation of the air conditioner, that is, the cab blower is turned on to the fourth gear, the water tank cooling fan rotates at high speed, and the external condenser dissipates well heat, if your air conditioner has low pressure, high pressure and low pressure under normal operation conditions, either the compressor displacement does not meet the requirements, or the expansion valve is faulty

Summary. Hello dear, it's a great honor for me to ask you questions. The low pressure and high pressure of the air conditioner are usually caused by insufficient refrigeration dose in the refrigeration system or the failure of the compressor.

The specific situation may be the following:1Internal leaks:

If there is a leak inside the air conditioning and refrigeration system, the refrigeration dose is insufficient, and the low pressure value on the low pressure side will rise. This can lead to poor operation of the refrigeration system and can lead to higher pressure values on the high pressure side. 2.

Compressor failure: If the refrigeration dose is normal, but the compressor is not working well or fails, it will lead to high low pressure and high pressure. 3.

Fan failure: If the fan in the air conditioner is not working, the refrigerant pressure in the refrigeration system will rise, which in turn will lead to low pressure and high pressure. 4.

System blockage: If there is a blockage inside the refrigeration system, the refrigerant flow decreases and increases the low pressure value on the low pressure side and causes the high pressure value on the high pressure side to rise. The above are some of the situations and reasons that may cause the air conditioner to have low pressure and high pressure.

If you encounter similar problems, it is recommended to contact professional air conditioner maintenance personnel for inspection and repair in time. Thank you for your trust, the above is all my reply, I hope it can help you, I wish you a happy life <>

Hello dear, it's a great honor for me to ask you questions. The low pressure and high pressure of the air conditioner are usually caused by insufficient refrigeration dose in the refrigeration system or the failure of the compressor. The specific situation may be the following:

1.Internal leakage: If there is a leak inside the air conditioner refrigeration blind system, the refrigeration dose is insufficient, and the low pressure value on the low pressure side will rise.

This can lead to poor operation of the refrigeration system and can lead to higher pressure values on the high pressure side. 2.Compressor failure:

If the refrigeration dose is normal, but the compressor is not working well or fails, it will lead to low pressure and high pressure. 3.Fan failure:

If the fan in the air conditioner is not working, the refrigerant pressure in the refrigeration system will rise, and the macro will be hidden in the air, resulting in high low pressure and high pressure. 4.System Blockage:

If there is a blockage inside the refrigeration system, the refrigerant flow decreases and increases the low pressure value on the low pressure side and causes the high pressure value on the high pressure side to rise. The above are some of the situations and reasons that may cause the air conditioner to have low pressure and high pressure. If you encounter similar problems, it is recommended to contact professional air conditioner maintenance personnel for inspection and maintenance in time.

Is it an expansion valve.

Pro, the expansion valve is a cause of poor refrigeration of air conditioners, but it is not necessarily the only reason for high low pressure and high pressure of air conditioners. Expansion valve problems can lead to insufficient refrigerant flow, which can lead to an increase in low pressure values, but because of the difference between high and low pressure, the high pressure may drop. Therefore, other elements should also be excluded or checked in order to determine the cause of the failure.

Hello, it may be the following reasons: the air conditioner has the problem of high pressure and low pressure, the main reason is that there is a problem with the throttling element or a dirty blockage in front of the throttling element, and the valve is not fully opened. First of all, check to confirm whether the high and low pressure shut-off valve is fully opened, and check whether the throttling element is normal.

In general, under the normal state of air conditioning and refrigeration, the normal value of the blue meter (low-pressure pipeline pressure) is 2-4bar. The red gauge (high-pressure line pressure) is normal for 15 bar. (1) Power supply problems (too high or too low voltage, thin power cord diameter, insufficient switching capacity); 2) The current of the compressor over the source (short circuit between the turns of the compressor, holding the shaft, stagnation, lack of refrigeration oil); Hail section (3), large load on the external machine (poor heat dissipation, dirty surface of the condenser, sunset, etc.); 4) The system is high-pressure side plug or semi-block; (5) Excessive refrigerant charge; (6) The current transformer of the main control board is short-circuited or the current detection circuit is faulty;

The low pressure, high pressure and low pressure of the automobile air conditioner are due to the failure of the expansion valve of the air conditioner, and there is a fault of blockage or throttling failure.

Under normal circumstances, the compressor of the air conditioner is between 1500-2000rpm, the pressure of high pressure is between, and the pressure of low pressure is between.

If this happens during normal operation, it is because the compressor displacement is not up to the required level, or the expansion valve is faulty. This phenomenon can also occur when compressors, solenoid valves, four-way valves, and motors do not run properly.

Air conditioner with low pressure high and high pressure high.

1. On this issue, it is by no means that the expansion valve is blocked, and if the expansion valve is blocked, there will be no low pressure and high pressure; 2. If the high and low pressure sides, the pressure gauge indicates that the value is higher than the standard and the discharge side of the condenser is not hot;

Cause: Overfilling of refrigerant.

Treatment: Discharge excess refrigerant to make the pressure reach 3, if the high and low pressure sides, the pressure gauge indicates that the value is higher than the standard and the condenser discharges side heat;

Reason: Air is mixed in when the refrigerant is charged.

Treatment: Re-vacuuming refrigerant.

1. The system has air, 2The compressor is damaged, 3. The refrigerant is added too much, and the outdoor unit cannot be condensed.