Murr Transformer 6686347

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.

06/29/2020

Compression ratio of American Copeland compressor

08/11/2020

What are the common problems in the use of cold storage for preservation products

Two commonly used measures to block the exchange of hot and cold air include installing an air curtain or installing a transparent plastic soft curtain in the cold storage door.

06/22/2020

What is the reason for uncooled air conditioner

Air-conditioning is a household appliance that will be used by every family in winter and summer. Occasionally encounters the problem of air-conditioning not cooling. The reason for air-conditioning not cooling is not very complicated. After understanding the reasons for air-conditioning not cooling, you can solve the problem by treating the symptoms, then What is the reason why the air conditioner is not cooling under normal circumstances? What to do if the air conditioner is not cooling? <img src="{{media url=&quot;magefan_blog/What_is_the_reason_for_uncooled_air_conditioner.jpg&quot;}}" alt="" />

12/10/2024

How to detect the tightness of the refrigeration equipment system

Keep the refrigeration equipment under a proper vacuum for a certain period of time, and observe whether the air infiltrates the system from the reading of the vacuum pressure gauge to check the sealing performance of the system.

09/06/2020

Dry air compressor sales, please keep these seven words in mind!

move】 　　 Work does not raise idlers, and the team does not raise idlers. 　　Go every day, not afraid of thousands of miles; 　　 Do it often, not afraid of everything.

06/14/2020

Refrigeration compressor failure phenomenon and determination method

Refrigeration compressor failure phenomenon and determination method 1. How to identify the three binding posts on the casing of the hermetic compressor? Running end (R), starting end (S), common end (C), the resistance between RS is greater than that器2䀀
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08/15/2020

Talking about the installation method of condenser

For the vertical condenser, it should be placed on the basis of marking according to the drawing requirements, and the vertical line should be used to ensure the verticality of the installation.

06/14/2020

Compressor refrigeration oil testing and replacement

Compressor refrigeration oil testing and replacement For system manufacturers, the detection and replacement cycle of compressor refrigeration oil is related to the process control of the production process. If the cleanliness control of the evaporator a器2䀀
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07/22/2020

Safety Operating Regulations for Freon Refrigeration Compressor Unit

Freon refrigerants are generally used in cold storage refrigeration systems, so the following is a brief introduction to some of the operating specifications of Freon refrigeration units, so that everyone will feel very simple and relaxed when using them.