Danfoss Compressor SM160W9PBQ

06/20/2020

What are the causes of air conditioning trip

What are the causes of air conditioning trip 1. The contradiction between the rated current of the air conditioner and the current carrying capacity of the wire. 　　Here are two formulas involved: 　　①The rated current of air conditioner I=P÷U ÷power factor, the power remains unchanged, the smaller the voltage, the greater the current required. 　　② The current carrying capacity of the wire I=U÷R, the voltage is proportional to the current. 　　 So when the power supply voltage is normal, we must consider the line voltage drop. The longer the line, the greater the resistance, the greater the voltage drop, and the smaller the output current at the end. However, because the power of the load remains unchanged, the voltage becomes smaller, and the current that needs to be output will be larger. At this time, the wire is forced to overload, and the time will cause heating, and eventually cause the tripping of the open circuit. 　　 Some friends said that the heat of the wire will not cause the tripping of the circuit breaker. In fact, the manufacturer of the air switch has made it clear in the relevant manuals that the heat of the wire will cause the air switch to trip. Because the wire heats up, the crimp terminal will also heat up, and the resistance will become larger and larger. The larger the resistance, the greater the current consumption, and the hotter it will be, a vicious cycle. 　　 2. Leakage 　　During the daily maintenance work, we will encounter the situation that the air circuit trips due to the leakage of electricity. At least I have not experienced it once or twice. Regardless of the leakage of the neutral line or the leakage of the live line, a long time will cause the circuit breaker to trip. 　　Why does the electric leakage cause the MCB to trip? There are two situations. 　　 ① Good grounding. At the beginning, the leakage current was not large, and as time went by, the leakage current became larger and larger, and eventually evolved into a short circuit to ground, unable to close. 　　②There is no ground wire. If the equipment is not connected to the protective ground, when the wire leaks to the equipment, it is equivalent to adding a large shunt resistance. Like this problem, if the air conditioner does not have a ground wire, when the wire leaks to the air conditioner, the air conditioner is a very large shunt resistor and will consume a lot of current. Eventually, the wire will heat up or trip open. 　　How to determine whether the trip caused by the above two aspects can be done with a clamp ammeter. 　　 ① Measure the voltage at the input and output to see if there is a significant change in voltage drop. 　　②Measure whether the output current exceeds the standard. 　　 So my suggestion is: first measure the supply voltage to see if it is within the allowable fluctuation range. Then measure the current to see if it exceeds the rated ampacity of the wire. Finally, check the data one by one according to the measured data to find out the reason.

08/19/2020

Influencing factors of air entering the refrigeration system during cold storage operation

In addition to the refrigerant, there are inevitably some mixed gases in the fresh-keeping cold storage refrigeration system. The main component is air, and there are some gases that are decomposed by oil and refrigerant at high temperatures.

01/10/2021

The importance and design application of hotel fresh air system

With people's emphasis on environmental protection and the continuous improvement of air quality requirements, the fresh air system has become a hot word that appears frequently. As a place for people to relax and entertain, the requirements for the decor器2䀀
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07/07/2020

Earth Hour: Hitachi Central Air Conditioner works with you to speak for the earth

07/20/2020

How to eliminate the difficult problems of the salt spray test chamber

Many people will blame the poor quality of the salt spray test box in actual use. However, the relevant departments have used statistical data to tell us that more than 50% of these problems are caused by operation. Only 5% is the quality problem of the salt spray test box itself.

06/14/2020

Centrifugal compressor2

Centrifugal compressors, also known as turbine compressors, are mainly used to compress gas. They are mainly composed of a rotor and a stator: the rotor includes an impeller and a shaft, and the impeller has blades, a balance disk, and a part of the shaft器2䀀
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08/19/2020

How to control the noise and vibration of industrial refrigerators

When industrial refrigerators are used, noise is unavoidable. Noise is the primary parameter to measure the performance of industrial refrigerators. It is directly related to the impact of industrial refrigerators on the surrounding environment.

08/24/2020

You need to be cautious when buying air conditioners.

The hot summer is the peak season for air conditioning sales. A citizen in Los Angeles bought a home central air conditioner, but it failed repeatedly. An appraisal found that this product was not the original brand in the purchase contract.

08/13/2020

How to judge the car air conditioner expansion valve ice block What are the symptoms

If there is moisture in the system, icing and blockage will occur at the expansion valve when the air conditioner is in refrigeration. After the blockage, the air conditioner will not be cooled.

08/11/2020

Will the amount of refrigerant cause frost in the return pipe and compressor

As far as air conditioners are concerned, generally speaking, the principle of system circulation is the same as that of refrigerator freezers. The symptoms of air conditioner systems are similar to those of refrigerator freezers when they lack fluorine.