How can you tell if the compressor of a refrigerator is good or bad?

In quiet conditions, listen to whether the compressor behind is humming, if there is no sound, the thermostat is broken, and the overcurrent protection switch is damaged. If there is a sound and then there is a click on the top of the compressor there are 3 binding posts, which are S, M and C, where S is the starting winding, M is the running winding, C is the common end, and the resistance value of the running and starting end is the largest; It is better to find a professional maintenance personnel for such things as start-up and common end resistance. The subject can call Haier's after-sales service**, or make an appointment for after-sales service on Haier's official website**.

If it's even on the system, the amount of the meter is not necessarily accurate, and I can often block it by hand to basically confirm it, and the table is not used (basically I haven't missed it).

Perform compressor testing. Compressor efficiency testing, that is, suction and exhaust sealing performance testing: when overhauling the refrigerator, if the compressor starts normally, the refrigeration effect is poor after charging the refrigerant, and the refrigeration system is normal, the compression efficiency should be detected, and after the compressor is shut down for 5min, the thermostat switch is adjusted to the maximum gear, and the compressor starts to work; After working for 5 7min, dial the thermostat back to the original gear (such as 1 2 gear), and the compressor should stop working at this time; If there is a fault here, there is a problem with the normal operation of the refrigerator, and at this time we must learn how to judge the fault, so as to find the fault at the **.

Contact 2 of the 3 terminal terminals with two table pens respectively, if the resistance value measured 3 times is consistent, it means that the winding is good; If the resistance value measured twice is infinity, it indicates that there is a group of windings that are open; If all 3 tests are infinity,Before replacing the compressor, be sure to cut off the power supply to the unit. Otherwise, there will be a risk of electric shock. When removing the compressor power supply, it is necessary to mark each wire and the corresponding binding post, so that the wiring can be restored after maintenance to ensure the cleanliness and dryness of the welded joint surface.

The whole welding process must be filled with nitrogen protection, and the nitrogen pressure is to ensure that the nitrogen reaches the welding position, so as to avoid the oxidation of the copper pipe at the welding place and the oxide scale.

How to judge the quality of the compressor on the refrigerator, how to wiring it, the master will teach you, and you will learn it.

Observe whether the automatic power-off function of this refrigerator is normal, if not, then the compressor is broken. The refrigerator has an automatic power-off function, and it will automatically power off when it reaches a certain temperature

Check whether the circuit power supply, compressor accessories (not energized, the motor does not rotate after power-on) are in good contact, whether the circuit voltage is normal, temperature relay, thermostat.

After powering on, there is a "click" sound inside the compressor, indicating that the suspension spring in the compressor is broken, and the movement collides with the housing. At this time, the compressor vibrates strongly and must be sent to the maintenance department to open the casing for maintenance.

If the leakage does not start, the switch will be jumped after powering on; After powering on, replace the starter without turning around for a while; If there is a high-pressure air leakage in the soft fault, cut the pipeline and power it on, and block the high-pressure exhaust port with your hand until it can not be blocked.

Compressor failure can be identified by sound 1, impact sound When the compressor is running, a metal impact sound is emitted in the machine, which is caused by the high-pressure silencing and fracture in the compressor; In the use of refrigerators, it often happens that this sound requires cutting the casing, replacing the high-pressure muffler tube, or welding the fracture position.

2. Boom sound (1) When the compressor is running, there is a kind of roaring sound in the machine, which is an abnormal sound that is found when the spring of the steam hanging in the machine is broken or dislocated, and it is easy to let the cylinder collide with the casing. (2) In this case, you need to cut the casing, check the cause of the dislocation of the hanging spring, or the cause of breakage, and so on, and after troubleshooting, the refrigerator can be restored to normal.

Compressor starter: 1. Heavy hammer starter: shake it with your hand after taking it off, and feel that something is shaking inside! Then use the multimeter resistor RX10 to turn the starter upside down to measure the two holes of the compressor to see if it is not through. It's good, it's bad!

1. If the refrigerator compressor is damaged, the refrigeration function of the refrigerator will be greatly affected, when the refrigerator does not work or the refrigerator room freezes, leaks, and makes a lot of noise, it means that the compressor may be damaged.

2. Compressor damage will generally be manifested from the power supply circuit, such as power failure, fuse dissolution, etc., check the power supply, voltage, line, starter, etc., if not, the compressor is damaged.

3. If the refrigerator compressor does not work, turn off the refrigerator, plug in the socket after a while, and turn on the power, if you hear a buzzing sound in the refrigerator, you hear a click after two or three minutes, which is sent by the compressor protector, which proves that the protector is not damaged. Remove the starter, pick it up and shake it, if you hear a rattling sound to prove that the starter is damaged, if you can't hear it, you can be sure that the compressor is damaged.

The compressor is an important part of the refrigerator, many people are worried about whether the compressor is broken when the refrigerator fails, in fact, if the refrigerator runs for a long time or fails, it is easy to have problems such as compressor overload protection and shutdown, but it will generally not cause the compressor to be damaged, and the probability of damage to the refrigerator compressor is very small.

1. Troubleshooting method:

1. Check whether the input power supply circuit has electricity;

2. Check the compressor accessories, including thermal protection and relays, thermal protection damage will cause the compressor to not be energized. The damage of the relay is manifested as the motor does not rotate after the power is turned on, and emits a "buzzing" sound, in this case, it should be shut down immediately;

3. Check whether the contacts of each connector are in good condition and whether the plug is tightly closed and not loose;

4. Check whether the circuit voltage is normal;

5. Whether the temperature relay is turned on or not, remove the relay box cover to check the contacts;

6. Check whether the thermostat is normal, and put the thermostat into warm water for testing.

After the above methods are eliminated, check whether the compressor is faulty.

Inspection method: After the refrigerator is energized, the compressor does not run, a slight humming sound can be heard, the thermal protection starter works after a few seconds, the contacts are disconnected, and the compressor still does not work after several times.

<> ways to judge that the refrigerator compressor is broken: 1. When the refrigerator does not work or the refrigerator room freezes, leaks, and makes a lot of noise, the compressor may be damaged. 2. If the refrigerator fails, the compressor is damaged after other reasons are eliminated.

3. If the refrigerator does not work, remove the starter, pick it up and shake it, if you can't hear the sound of the clatter, it can prove that the compressor is damaged.

If the compressor is broken, it will not be refrigerated, or the refrigeration efficiency will be reduced.

Refrigerator compressor maintenance method:

1.Perform compressor testing. Compressor efficiency testing, i.e., suction and exhaust seal performance testing

When overhauling the refrigerator, if the compressor starts normally, the refrigeration effect is poor after filling the refrigerant, and the refrigeration system is otherwise normal, the compression efficiency should be tested; Measure the pumping performance of the compressor.

2.The performance of the motor is tested. Separately detect the winding open circuit:

The motor runs between 10 20 RMC and 30 50 when it starts at 30 50, and the resistance between the two winding ends is the sum of the two (RMS=RMC+RSC).

If you still can't start if you replace a compressor starter, then there are three possibilities, one is that the compressor is broken, one is ammonia leakage, and the other is pipe blockage.

It is a common termination of the thermal protector, the sound, the cause of the cause, there are, 1, the starter is bad, replace one to try, 2 the thermal protector itself problem, also replace the try, 3 compressor coil failure, can be judged by measuring the resistance at the three ends, 4 compressor shaft, you can gently knock on the shell to see if it can be improved,,, these items can be checked in order from easy to difficult.

1 & 2 Binding Posts, 1 & 3 Binding Posts, 2 & 3 Binding Posts. Under normal conditions, the resistance is . The minimum resistance value is the running winding resistance, the starting winding is greater than the running winding is less than the maximum resistance, and the maximum resistance is the sum of the running winding and the starting winding.

Judgment: The measurement resistance is infinite, that is, the open circuit, and the measured resistance is very small or close to zero, which is a short circuit. The maximum sum of the running winding and the starting winding indicates that there is an interturn short circuit between the windings.

Second: the insulation resistance of the compressor motor is measured, and the measured insulation resistance is less than 2m, indicating that there is leakage in the motor winding and shell, which is not suitable for use.

Third: compressor suction and exhaust performance inspection. At the beginning, the suction and exhaust pipes on the compressor should be welded open, and then the compressor should be energized to run.

At this time, use your hands to block the exhaust port, and if it is difficult to block, it means that the exhaust performance of the compressor is better. Loosen the exhaust port and gently block the suction port, the suction feeling is strong and the compressor noise is reduced. It shows that the exhaust suction performance of the compressor is better.

Conversely, the exhaust has poor suction performance.