Compressor low pressure protection 10, compressor low pressure protection

Low-voltage protection is generally caused by lack of fluorine, and high-pressure protection is caused by pipeline blockage, capillary blockage, radiator dirt, thermal protection overload, abnormal temperature control head, abnormal heat dissipation, etc. It's okay to cool down in winter, turn the temperature down.

When the voltage is unstable, the air conditioner will automatically protect, and the normal working voltage of the general air conditioner is 180V-230V, if it is lower or higher than this voltage, it will not work normally. If the voltage is too low and the air conditioner voltage is not working enough, the compressor will not work properly. If it is too high, it will cause the compressor to rotate quickly and burn it out.

The computer automatically disconnects when it detects that the voltage is too high.

They were right, it should be that the system of the two small compressors lacks refrigerant, or the throttle valve is too small.

The purpose of the low-pressure protection circuit is to protect the compressor, and when the pressure is lower than a certain minimum value, the press will be automatically disconnected and alarmed. You broke it and it was able to run, but it hurt the press.

There are a few things you want to check:

Whether the high pressure pressure is normal.

Whether the low pressure is normal.

The results are divided into several scenarios.

All are normal, it is possible that the low-pressure pressure switch is faulty.

The high pressure and low pressure are all low, and there is still a lack of refrigerant.

The high pressure is high, the low pressure is low, and the system is blocked.

What brand of white air conditioner are you. I can help you look it up.

Master: I can't talk about it at that time, but I know that some of the general low-voltage alarms are caused by less refrigerant, and it is recommended to add refrigerant to see if there is any leakage in the pipeline and whether the refrigerant pipeline is blocked

The refrigerant radiator is not dirty, etc

It is recommended not to disconnect the low voltage protection is not good for the machine

There is less refrigerant, which belongs to the second level of refrigeration, that is, the two small compressors are less than the first stage.

There is a problem with the expansion valve, and it needs to be overhauled.

The high and low pressures after the shutdown are balanced.

The high pressure alarm is because the discharge pressure of the compressor is too high, and if the high pressure warning value is not set properly, it needs to be readjusted, and if the high pressure protector fails, it needs to be replaced with a new one. 1. The evaporator is dirty and blocked. The most common reason for the high voltage protection of the air conditioner is because the air conditioner does not dissipate heat well, of course, the air conditioner evaporator may be due to the poor heat dissipation of the air conditioner.

Dirty blockage, these things are related to each other. Solution: Clean the evaporator of the air conditioner regularly to ensure that the evaporator will not be dirty.

2. The fan of the external unit is broken. If the fan of the air conditioner is rusted or stuck due to rainwater, the fan speed will slow down, and in serious cases, the fan will be damaged, which will cause the air conditioner to be protected by high pressure. Workaround:

Clean up the rusty iron of the air conditioning fan bearing in time, which can better ensure that the fan rotates more smoothly and faster, and the problem of high pressure protection of the air conditioner will be solved. How to maintain the air conditioner? First of all, you need to turn on the air conditioner, and under the condition of ensuring ventilation, clean the air conditioner and clean the shell of the air conditioner.

Then open the shell, take the filter under the water pipe to rinse, do not clean with chemicals, so as not to affect the use of the filter. If the water flow can't clean the dust of the filter, you can use a dry rag or a small brush to wipe it gently, don't put the filter under the sun to expose it, you can find a cool place to dry it naturally.

Dear, I am glad to answer for you: the solution to the low-pressure fault of the compressor is as follows; 1. The setting value of Peisong low-voltage protection is incorrect. Ways to solve this problem:

The correct low bending pressure protection setting value should be set at around 2 bar. 2. The amount of fluoride is not enough to make trouble. Ways to solve this problem:

If fluoride deficiency is indeed occurring, the air conditioning system should be supplemented with freon refrigerant. 3. The air filter is too dirty. Ways to solve this problem:

Clean the foreign matter on the filter screen to remove the alarm.

The low pressure protection of the compressor is mostly caused by the unreasonable value of the pressure protection switch.

In particular, in parallel units consisting of several compressors, the shutdown procedure is performed when the parallel unit controller detects that the pressure value of the sensor is lower than the set pressure. If the shutdown interval between the two compressors is set slightly longer, and before the last compressor is shut down, the compressor suction pressure value is lower than the protection pressure set by the mechanical pressure switch, resulting in a low suction pressure alarm.

This problem is often encountered for units that are already in normal operation after the end of trial operation. For problems that arise during this period, it is necessary to personally measure the pressure drop before and after the filter installed on the return line, and accurately obtain the suction pressure value at the inlet of the compressor.

If the pressure drop through the suction filter is too large, a new suction filter must be replaced. If you only adjust the value of the mechanical pressure protection switch incorrectly, the pressure difference between the front and back of the compressor inlet filter will become larger and larger, and the suction pressure after the filter will be lower and lower, which will greatly reduce the working efficiency of the compressor and increase the risk of failure of the compressor operation.

Chiller low-pressure protection solution: check whether there is ice blockage or dirty blockage in the pipeline of the refrigeration system of the unit, and after eliminating the pipeline blockage, you can add a certain amount of refrigerant to the system, so that the low-pressure protection can be eliminated. The internal causes of the system are mainly freon leakage, filter drier blockage, expansion valve temperature bag leakage, and insufficient opening of the expansion valve.

The external cause is that the evaporator is too dirty, and the heat load is insufficient. The cold air unit may also have a blocked filter, insufficient air volume, and insufficient water flow of the chiller may produce low-pressure protection.

1.Temperature-induced protection:

1) The refrigerant is insufficient or the expansion valve is opened too small, and the return air temperature is too high, resulting in the exhaust temperature exceeding the protection temperature, temperature protection (accompanied by low pressure).

2) The reflow temperature is too high. This leads to an increase in the temperature of the exhaust gases, resulting in temperature protection (accompanied by low pressure).

3) The high-temperature package of the expansion valve is too close to the compression balance companion. The temperature detected by the temperature sensor is larger than the actual temperature, causing the expansion valve to open too widely, the refrigerant to evaporate incompletely, and part of it enters the compressor in a liquid state, causing liquid hammer.

4) The working conditions of the condenser are relatively poor, the surface of the condenser is dirty (dust or oil) resulting in abnormal heat exchange, and the high ambient temperature of the condenser leads to abnormal heat exchange, resulting in an increase in condensation temperature, a decrease in condensation, and an increase in pressure from the exhaust to the condenser pipe section, resulting in high compressor exhaust pressure and temperature (temperature protection).

5) The compressor lacks oil or the motor bearing is damaged, the motor heats up, and the heat cannot be dissipated in time, resulting in temperature calling.

6) Incorrect refrigerant charging type (different refrigerants, matching of oil, heat exchanger, expansion valve and refrigerant charging volume).

2.Pressure-induced protection:

1) Too much refrigerant. In the event of liquid hammer, the compressor compression is difficult, and the load exceeds the standard, resulting in high-pressure protection (the pressure does not necessarily rise during temperature protection, but the temperature rise must be accompanied by high-pressure protection, because the motor heats up).

2) The pipeline is dirty and blocked. Such as filter blockage, capillary blockage, etc. , resulting in an increase in exhaust pressure, which provides high-pressure protection.

3) There is air in the ducts. Compression is difficult, resulting in high pressure protection.

4) The low pressure is too low.

Compressor overload protection will trip, indicating that the system is too high-pressure, the pressure is too high, or the overheating current is too high. Causes and exclusions of high pressure, high pressure, and overheating: 1. Refrigerant.

Plethora. Reduce the refrigeration dose appropriately.

2. Poor heat dissipation. Check the condenser pipe for dirt and dirt and clean the condenser.

3. The pipeline system is blocked. Refer to the pressure gauge.

Judgment, exclusion, and re-systematic processing.

4. Dust and fouling of the evaporator or filter screen. The airflow becomes smaller, the system pressure and temperature are unstable, and the evaporator or filter is cleaned.

5. Fluoride deficiency is also possible.

When there is a lack of fluorine, the exhaust temperature of the compressor will be overheated, which will make the overheated negative permeation load protection switch trip. The electrical problem is:

1. Control circuit board failure.

2. The temperature sensor is overloaded and the information is wrong.

3. The power supply plexus is late and the wiring is loose and the contact is poor.

4. The starting capacitor or compressor starting coil is burned out.

The outdoor compressor is suspected of defending the high-pressure protection for the following reasons:

Refrigerants. If it is excessive, connect the pressure gauge to discharge the excess refrigerant.

Outdoor unit condenser.

Dirty blockage, clean the outdoor unit condenser, improve the heat dissipation conditions of the condenser.

The capacitance of the outdoor fan (cooling tower) is attenuated, and the speed is too low, and the capacitor of the fan can be replaced.