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Walk-in cooler refrigeration device failure analysis and treatment (2)
author: supermarket refrigerated showcase category: walk-in display coolers Views: 538Time: 2016-08-22
walk-in cooler refrigeration device failure analysis and treatment (2)
(3) For new series products, the oil pump pressure gauge reading should be 0.15 higher than the suction pressure 0.3 Xiu. For old series products, the reading of the oil pump pressure gauge should be 0.05~0.15MPa higher than the suction pressure. For example, a 2AL15 old series walk-in cooler refrigerator, the oil pressure gauge reading 0.29MPa, working under air conditioning conditions, its suction pressure is 0.26MPa. Obviously the real oil pressure of the oil pump is only 0.29-0.26=0.03MPa. If it is abnormal, it should be adjusted in time to increase the oil pressure to 0.31x-0.4MPa.
(4) The suction temperature of the ammonia refrigerator is 5-10℃ higher than the evaporation temperature, and the maximum temperature of the fluorine refrigerator is 15℃. The suction temperature is measured at the suction pipe or the thermometer socket at the suction port of the refrigerator. If it is not on the equipment, add a thermometer socket when installing. Small refrigeration units generally do not have a thermometer socket. A semiconductor thermometer can be used to measure the temperature of the outer wall of the suction port of the refrigerator, and then subtract the appropriate temperature difference to obtain the suction temperature.
(5) There should be no local heating and frost on the cylinder wall, and the surface temperature difference should not exceed 20℃. For refrigeration and low-temperature devices, frosting on the suction pipe can generally reach the suction port: For air-conditioning refrigerators, the suction pipe should not be frosted; generally, condensation is normal (condensation also depends on the air dew point temperature. ).
(6) In any case, the oil temperature of the crankcase should not exceed 70℃ for fluorine refrigerators, 65℃ for ammonia refrigerators, and no lower than 10℃. Under normal operating conditions, the lubricating oil should not foam (except for fluorine refrigerators).
(7) The discharge temperature of walk-in cooler, the new series of products ammonia and R22 do not exceed 135℃, R12 does not exceed 110℃, and R13 does not exceed 125℃. If the exhaust gas temperature rises further, the flash point (160°C) of the domestic refrigerating oil is very small, which is detrimental to the equipment. Therefore, from the perspective of use, the exhaust temperature should not be too high. If it is too high, stop and find out the cause. Different types of refrigeration have different requirements for this temperature. For example, the exhaust temperature of a refrigerator operating under air conditioning conditions is higher than that of a refrigerator operating under standard conditions, which is normal.
(8) The level of condensation pressure is mainly determined according to the water source, the structure of the condenser and the refrigerant used. Under normal circumstances, for the new series of products, water-cooled condensers, R22 and ammonia do not exceed 1.37MPa, and R12 does not exceed 1.18 arsenic. : For old series products, R22 and ammonia do not exceed I.37 arsenic. , R12 does not exceed 1MPa. In operation, too high condensing pressure is harmful to the improvement of refrigeration efficiency. Therefore, during use, the condensing pressure should be reduced as much as possible according to specific conditions, rather than reaching the upper limit of the above operation. In addition, it is normal for the pressure to be higher in a short period of time due to the heavy load of the condenser during the first drive.
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