Common causes of failure of compressors in high and low temperature damp heat test chambers and how to operate in the field
What is the role of the compressor in the high and low temperature damp heat test chamber and how to solve it if something goes wrong! Here is our Xiaotian Xiaobian to explain what the compressor plays. The refrigeration compressor is the heart of the entire refrigeration system. It is the most important in the refrigeration system. The main function is to compress the low-temperature and low-pressure gas from the evaporator into High temperature and high pressure gas provides the source of power for the entire refrigeration cycle.
Three types of compressors, such as piston type, rolling rotor type and scroll type, are mainly used in air conditioning.
Pull the rubber plug sequence: first exhaust pipe and then suction pipe. If the suction pipe rubber plug is first pulled, the refrigeration oil accumulated on the liquid filter screen will be sprayed with nitrogen, so first pull out the exhaust pipe rubber plug, reduce the nitrogen pressure in the compressor, and alleviate and eliminate the fuel injection phenomenon.
1. How to identify the 3 terminals on the fully enclosed compressor casing?
The resistance between the running end (R), the starting end (S), the common end (C), and the RS is greater than the resistance between the SC and the resistance between the RC. The resistance between RS is equal to the resistance between SC and the resistance between RC.
It can be discriminated by using the above rules. It should be noted that the resistance values ​​of the terminal temperature rise tester of the three-phase compressor are equal.
2. How to judge the short circuit of the compressor motor winding?
Use a multimeter to select the resistance file. After zeroing, measure the resistance of the compressor motor winding CR or CS. If the resistance of the measured winding is less than the normal value, it can be judged that the winding is short-circuited.
Three-phase compressor:
â—† The resistance measured in 2 times is infinite, indicating that there is a set of winding open circuits;
â—† 3 tests are infinite, indicating that at least two sets of windings are open;
â—† The resistance measured twice in 3 measurements is significantly less than the other measured, indicating a short circuit.
3. How to judge the compressor motor to touch the ground?
Use the resistance of the multimeter. Then, the pen is firmly pressed against the common point, and the other pen is placed on the compressor process tube to expose the metal part, or the small piece of the outer skin of the outer casing is removed for measurement. If the resistance value is small, it can be judged that the winding or the internal wiring is in contact with the ground.
4. How to judge the compressor motor winding open circuit?
Turn the multimeter to the resistance file, connect the test leads to the terminals of any two windings, and measure the resistance value. If the winding value is infinite, that is, the terminals of the two windings are not guided, the winding can be judged to be open.
5. What does the compressor not start to check?
â—† Check if the compressor overload, pressure switch, and overcurrent protector are tripped or damaged.
â—† Check whether the indoor temperature sensor and the temperature controller are open or poorly connected, and whether it is short-circuited under heating conditions.
â—† Check if the relay is closed, whether the compressor is open or shorted, and the compressor capacitor is broken.
6. What is the cause of the overheating of the compressor and the shutdown caused by the start?
â—† Insufficient or excessive refrigerant, blockage of capillary components, air leakage inside the four-way valve.
â—† The compressor itself is faulty, such as short circuit, open circuit, and shelling.
â—† The high pressure is too high and the pressure relay operates.
â—† The condenser is poorly ventilated or short-circuited, or the system is mixed with non-condensable gas.
â—† The outdoor unit ambient temperature is too high.
â—† Compressor card cylinder or axle.
7, the performance of the compressor is low
Generally, the exhaust pressure drops, the suction pressure increases, and the temperature of the compressor cylinder head and the suction and exhaust chambers are too high.
8. Judging the loss of working capacity of the compressor
First test the suction port for inhalation, then test the exhaust port for exhaust, block the exhaust port with your hand, if the pressure is not very large, or even without exhaust, the compressor can be considered to be incapable of working.
9. Why is the compressor motor current too large?
The compressor is short-circuited between turns, but it does not reach the extent that the fuse is blown. The "sub-friction" of the compressor destroys the smoothness of the friction surface, causing the compressor's power and current to increase, but has not yet reached the level of "holding shaft" or "cylinder", so that the compressor cannot rotate.
Use a multimeter to check the insulation resistance of the compressor to ground. Under normal conditions, it should be above 2MΩ. If it is smaller or close to zero, it indicates that it has been short-circuited. If the insulation resistance to ground is normal, check the resistance value of the starting and running windings. If there is a short circuit between turns, the operating current increases.
10. What are the reasons for the difficulty in starting the three-phase compressor motor?
â—† The power supply voltage is too low and the compressor motor winding is short-circuited.
11. How to eliminate the failure of the three-phase compressor motor in the running speed, the fuse of one phase is blown, and the current of one phase is increased?
â—† It is often caused by a phase of the compressor motor windings passing through the ground. After removing the grounding wire, use the test pencil to measure whether the casing is energized. If the casing is live, rewind the compressor motor winding or replace the compressor.
12. How to eliminate the “beep†sound of the three-phase compressor motor during operation?
â—† The three-phase compressor motor emits “åå†during operation, which is caused by serious imbalance of three phases. One phase of the power supply lacks phase and can recover three phases.
13. How to eliminate the reverse rotation of the three-phase compressor motor?
â—† It is caused by wiring error, and you can exchange two lines of three phases at will.
14, compressor replacement sequence and points of attention
â—† R22 is a non-combustible gas. However, if it is directly in contact with a high-temperature flame, toxic gas is generated. Therefore, the refrigerant in the refrigeration system is released before the welding operation.
â—† R32 is a flammable and explosive refrigerant. Our Dongguan Saisi Testing Equipment Co., Ltd. has repeatedly emphasized the characteristics of this refrigerant. Any R32 refrigeration equipment involved in the refrigeration system maintenance needs to replace the parts, must be vacuumed before operation! Be careful not to introduce a fire source!
â—† R410a is low-toxic, non-combustible and non-explosive. To replace the compressor, it is necessary to use the R410A compressor. Dui can't use the R22 compressor to install it. When replacing the valve, the R410A has a special logo on the valve body.
15. What types of air conditioner compressor overload protectors are there?
â—† External overload protector; embedded overload protector.
16. What are the protections of the compressor?
â—† Overload protector: mainly used for overcurrent and overheat protection of compressor motor.
â—† Internal protector: Mainly protects the compressor motor from overcurrent.
â—† Thermal relay: Mainly used for line overcurrent protection of three-phase compressor motor.
â—† Inverting preventer: mainly used in three-phase rotary compressor to prevent the reverse direction of the compressor or phase loss.
17. What are the common reasons for overload protectors?
â—† The power supply voltage is too low and the symmetry of the three-phase voltage is poor.
â—† Compressor motor extended time and low speed operation.
â—† Compressor motor has long-term low voltage and load operation.
â—† The compressor motor cooling medium path is blocked.
â—† The ambient temperature is too high.
18. What is the liquid stroke of the compressor?
â—† The refrigerant does not completely evaporate in the evaporator, causing the refrigerant to be sucked back by the compressor in wet steam or liquid, causing liquid shock of the compressor.
â—† The liquid hammer will cause the valve plate, valve plate and piston to be damaged and damaged. In severe cases, the connecting rod may also be deformed or even the compressor may be damaged.
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