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1, why to control the compressor and air conditioning system impurity content and moisture content?
Moisture in compressors and air conditioning systems can have adverse effects in several ways:
The capillary and expansion valve will produce ice blockage, and the evaporator cooling tube will also freeze;
Metal materials are corroded, forming amylates;
The valve core is corroded and the closure is not tight;
The surface of compressor pump body parts produces "copper plating" phenomenon;
Accelerate the deterioration of insulating materials, refrigerant, refrigerant oil and other materials.
2. What effect will low voltage have on the air conditioning system?
If the voltage is too low, which is much lower than the specified voltage range of the compressor, because the blocked current value is likely to fail to reach the operating current specifications of the protector, it will cause the protector to fail to act in time, and the compressor motor will overheat or even burn.
3. What is the function and principle of the compressor protector?
The function of the compressor protector is mainly to protect the compressor from accidents such as motor burning when it is in abnormal condition. The internal heating wire of the protector and the internal resistance of the bimetal plate make the bimetal plate act through the combined action of current heating and external conduction heat, thus cutting off the circuit and protecting the compressor from damage.
4. How to make basic judgment and treatment after compressor failure?
Unable to start, no suction and exhaust pressure: Check compressor cables, pipe connections, impedance of primary and secondary coils, and compressor insulation and voltage resistance. If yes, remove the compressor and check whether there is suction and exhaust.
The suction and exhaust method is: when the compressor is running, the finger is pressed against the exhaust port for a few seconds, and then let go to observe whether there is gas ejection, of which a small amount of oil ejection is a normal phenomenon. If there is suction and exhaust, and the exhaust pressure is large, it indicates that the compressor can work normally. Otherwise, the compressor is abnormal.
5, why to prohibit liquid refrigerant reflux into the compressor suction chamber?
If the liquid refrigerant directly enters the suction chamber of the compressor, during the rotation of the crankshaft, the volume of the compressor becomes smaller and smaller, and the pressure rises sharply, resulting in abnormal force and even damage to the pump body and valve plate. Liquid percussion can also cause abnormal vibration and noise of the compressor.
In addition, after the liquid refrigerant enters the cylinder, it will "wash away" the lubricating oil on the surface of the piston, blade and other parts, resulting in a situation equivalent to "oil shortage operation", abnormal wear and even cause the compressor to hold the shaft.
6, why the refrigerant recovery time of air conditioning should not be too long?
The refrigerant recovery operation room of the air conditioner should not be too long. Because the refrigerant recovery time is too long, because the inhaled refrigerant gas is extremely thin, the exhaust temperature will be very high, causing the temperature of the pump body parts of the compressor to rise rapidly. Too high temperature makes the expansion degree of each part too large, resulting in the matching gap of some parts becoming smaller or even disappearing, and eventually producing abnormal scratches or wear.
7, the compressor is connected to the wrong line what impact? Why can't the protector protect?
The wrong connection of the compressor will make it unable to work normally, and according to different wiring errors, there will be gridlock, reversal, stop after starting, and other phenomena, and it is likely to lead to the direct burning of the compressor motor.
Because the compressor protector is selected according to the working characteristics of the abnormal working condition protector when the compressor is correctly wired, it is impossible to ensure that the compressor is protected when the wrong line is connected. In the case of wrong wiring mode, it is difficult to protect the motor through the protector.
8, the same system, for different manufacturers of compressors need to adjust the system?
Because the performance characteristics of compressors produced by different companies are different, for a specific compressor, only in the specific refrigerant flow, suction and exhaust pressure, temperature and other conditions will show the best performance.
Therefore, in the same air conditioning system, it is best to adjust the system when using different compressors to ensure that the compressor used works normally under the appropriate refrigerant flow rate and suction and exhaust pressure and temperature conditions, so that the service life of the compressor can be effectively extended and the best use effect can be achieved.
9, why the operation of the compressor motor coil temperature requirements?
The insulation class (insulation class: A(105°C), E(120°C), B(130°C), F(155 °C), H(175°C)) and heat resistance characteristics of the insulating material used in the compressor motor are determined. For the motor enamelled wire, too high temperature will lead to the reduction of the amount of skin film cocoon, friction resistance K drop, easy peeling, insulation damage voltage and insulation impedance K drop, etc., so that the service life is greatly reduced.
In addition, the motor temperature is too high can cause the insulation material in the polymer dissolves too much, these substances will be in the system somewhere or compressor exhaust port precipitate aggregation, thus affecting the performance of the compressor and system. In addition, the coil temperature is too high will cause the compressor motor efficiency is reduced.
10. Why can the compressor be started again after being shut down for at least 3 minutes?
When the compressor starts, there will be more refrigerated oil with the refrigerant circulation into the air conditioner system, if there is not enough running time, then the refrigerated oil will not be able to return to the compressor chamber in time, often start soon to stop will lead to low oil level inside the compressor, easy to cause poor lubrication of the compressor mechanical moving parts. In addition, more than 3 minutes of downtime is mainly to give the system enough pressure balance time, otherwise due to the existence of high and low pressure, it will lead to the compressor can not start normally.
11, why can't the compressor run in "vacuum conditions"?
The so-called "vacuum condition" is not an absolute vacuum state, but an extremely low pressure state, and gas molecules will ionize at extremely low pressure.
According to the actual experimental results, the breakdown voltage of the compressor terminal is the lowest when the internal pressure of the compressor is about 3.5mmHg, and the phenomenon of breakdown and internal carbon accumulation is easy to occur when the power is on, which damages the insulation of the sealed terminal post, and the accident of burning and flying of the sealed terminal post occurs when the compressor is in operation. Therefore, power should be avoided in the vacuum state of the compressor.
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