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display cases refrigeration but noisy maintenance (2)
display cases refrigeration but noisy maintenance (2)
5. display cases buzzing sound during cooling failure phenomenon: display cases buzzing or others when cooling Low frequency sound. 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, it is caused by the resonance of the part.
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.
6. Sometimes creaking sounds during the refrigeration process. Fault phenomenon: The freezer compartment sometimes sounds creaking sounds during the cooling process. Failure analysis: It is more common in the upper and lower refrigeration models. The reason is that the freezing evaporator is caused by thermal expansion and contraction. It should be a normal phenomenon, but you can try to eliminate it. Troubleshooting: Slap the freezer compartment evaporator 1 to 5 times by hand, generally can eliminate the creaking sound.
7. A loud Dangdang sound is emitted at the moment of start and stop. Fault phenomenon: The ratio of refrigeration and start and stop time is normal, but the compressor emits 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 height of the four legs of the display cases, and some are internal problems of the compressor. Troubleshooting: Follow the steps below.
① display cases Try to tilt slightly. If the fault disappears, re-place the 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 by a spring or mounted on a seat spring. 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. The fan noise of the indirect cooling machine is too loud. Trouble phenomenon: the fan is running loudly and the others are normal. Fault analysis: Most of the fan motors are installed incorrectly, and a few are fan motors. Troubleshooting: first try to adjust the position of the fan, if not, replace the fan motor.
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