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display cases No cooling or cooling difference characteristics and maintenance (2)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 522Time: 2016-08-22
No cooling or cooling difference characteristics and maintenance
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freezing After the oil enters the refrigeration system, the passage and internal space occupied by the refrigerant in the system will be restricted, reducing the refrigerant flow rate, resulting in a decline in the cooling effect. Features: There is a layer of frost on the evaporator. When you touch the surface of the evaporator with your hands, there is no sticky feeling. There are grunt and sound inside the evaporator.
unclean characteristics:
display cases The condenser is locally heated and hot, and the local temperature is normal, with snoring and sound. Maintenance method: After opening the compressor process nozzle to vent, re-evacuate, and then add refrigerant.
the compressor efficiency is low. During long-term operation of the compressor, with mechanical wear, the gap between the cylinder and the piston exceeds the allowable limit value, plus the valve plate, The carbon deposits of the valve plate make the compressor's sealing performance not guaranteed, and the compression and suction and exhaust of the refrigerant are not enough, which affects the cooling effect. Features: High pressure does not go up, low pressure does not come down, the temperature of the return air pipe is too high, and defrosting appears behind the evaporator in severe cases. After the refrigeration system is deflated, open the compressor exhaust pipe by welding, and hold the pipe nozzle with your thumb within 10 seconds. Repair method: replace the compressor of the same model.
compressor internal failure due to the large pressure difference, high temperature, and fast speed during compressor operation, there is inevitably impact and vibration, and the exhaust pipe is broken in the casing , The failure of the oil-resistant rubber asbestos gasket between the valve plate and the cylinder head and cylinder end surface, and the fatigue deformation of the valve plate. At this time, not only the high and low pressures are in collusion, but also the display cases refrigeration system cannot work normally. The refrigerant basically circulates in the compressor shell locally and cannot be cooled. Feature: The sound of mechanical vibration and air flow in the compressor casing is obviously increased. Repair method: replace the compressor of the same model. It can also open the shell for repair and repair broken pipes.
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