Danfoss Compressor DSH760A9AAB

08/09/2020

Do you know the selection criteria of electronic valves for cold storage systems

In the cold storage refrigeration system, the selection of components must strictly abide by the four basic principles of safety, reliability, applicability and economy.

07/26/2022

How to Choose A Water Pump

The flow of the water pump, that is, the water output, generally should not be too large, otherwise it will increase the cost of purchasing the water pump.

09/05/2020

What is the difference between single screw compressor and twin screw compressor

Single-screw and twin-screw manufacturing process of twin-screw is more complicated than single-screw in terms of structure, and the difference in service life and working efficiency is not very big,

06/14/2020

Ammonia refrigeration equipment has leaked, which is the safest way to deal with it!

Ammonia refrigeration equipment has leaked, which is the safest way to deal with it! 1. The danger of ammonia refrigeration system in advance 　　According to the statistical analysis of the actual operation of the refrigeration system, the safety risk ma器2䀀
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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.

08/20/2020

Air conditioner repairs are too messy the repairman has just walked for 10 minutes and the repaired air conditioner is broken again

"The air conditioner broke down after a while after it was repaired. Now I want to contact the maintenance company but I don't care what it says." Recently, as the temperature rises, the air conditioner usage rate has continued to increase

04/02/2022

How to Replace Air Conditioner Fan Blade?

Air conditioner is also known as air conditioning machine. It is a machine that manually adjusts and controls the temperature, humidity, cleanliness, speed and other parameters of the ambient air in the building.

08/05/2020

Comprehensive introduction of central air-conditioning installation auxiliary materials (recommended collection)

Generally speaking, the auxiliary materials required for the installation of household central air-conditioning mainly include the following types:

06/29/2020

Compression ratio of American Copeland compressor

06/14/2020

Cold storage operation management and compressor common fault handling

Cold storage operation management and compressor common fault handling 1. Startup and preparations Before starting the machine, check whether the valves of the unit are in the normal starting state, and check whether the cooling water source is suffic器2䀀
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