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display cases The secondary faulty machine has a large noise
author: supermarket refrigerated showcase category: commercial refrigeration Views: 984Time: 2016-08-22
display cases The secondary faulty machine has a large noise
1. The noise becomes large and no cooling during the filling process
(1) Fault phenomenon: the original machine has poor cooling, and the refrigeration system is repaired. During the refrigerant process, the noise becomes very loud and still not cooling. Failure analysis: The anti-vibration (for transportation) foam on the back of the compressor is not taken out. Troubleshooting: Unplug the display cases power plug, open the rear panel of the compressor, and take out the foam at the rear of the compressor.
2. display cases buzzing sound during cooling failure phenomenon: display cases buzzing or other low-frequency sound when cooling. Fault analysis: Mostly caused by compressor vibration, the reason is the resonance of the compressor and the bottom plate or display cases and refrigeration pipelines. Troubleshooting: According to personal maintenance habits, solve the problem according to the following methods. Generally speaking, which part of the hand touches the buzzing noise is eliminated or reduced, and the resonance of the part is caused.
①Adjust the position of the vibration damping block on the exhaust pipe.
②Try to apply shock-absorbing mortar on the top of the compressor. The location of the application can only be found through constant adjustment to find the best point.
③Adjust the tightness of the four compressed fixing bolts (generally need to loosen slightly).
④ Reshape the return pipe and exhaust pipe.
3. Sometimes there is creaking sound during the refrigeration process. Fault analysis: It is more common in the refrigeration and refrigeration models of the above. The reason is the thermal expansion and contraction of the refrigerated evaporator. This should be a normal phenomenon, but you can try to eliminate it. Troubleshooting: Tap the freezer compartment evaporator 1 to 5 times with your hand, generally it can eliminate the creaking sound.
4. A loud Dangdang sound will be emitted at the moment of start and stop. Failure phenomenon: The ratio of refrigeration and start and stop time is normal, but the compressor makes a very loud Dangdang metal crash sound at the moment of startup or shutdown. Failure analysis: Most of the display cases are caused by the inconsistent height of the four legs, and some are internal problems of the compressor. Troubleshooting: Press the -F step to proceed.
① display cases Try to tilt slightly. If the fault disappears, re-swing to discharge the ice display cases.
②Try to adjust the height of the four feet of the compressor.
③Open the compressor shell and adjust the internal spring force to be uniform.
[Note] The body of the compressor is hoisted on the upper shell or mounted on the seat yellow with springs. If the force of the spring is not uniform, the compressor will vibrate at the moment of operation and shutdown, causing the body and the casing to collide and produce noise. In addition, the vibration of the high-pressure coil in the compressor can also cause instantaneous noise during operation and shutdown.
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