refrigerated showcase display cases Share the experience and skills of repairing refrigerators and supermarket refrigerated showcase
1. First put out the refrigerant, and then use the torch to bake when the ice is blocked, if the low pressure is not recovered , First let go of the refrigerant and bake the interface between the filter and the capillary tube. After the solder is melted, the strong pressure refrigerant is easy to be injected and accidents occur. Especially for refrigerators using R600a refrigerant, after cutting the process tube, the capillary at the interface between the filter drier and the capillary tube should be cut, and the compressor process tube should be energized to suck dry air or nitrogen and R12 gas from the filter drier. discharge.
2, cooling difference pipeline leaks, which reduces the refrigerant and causes poor cooling effect, and the thermostat keeps on stopping. A refrigerator with a thermostat that does not stop automatically does not work if the thermostat is changed multiple times. The minimum temperature of the evaporator in the refrigerator is only -5°C with a thermometer. The shutdown temperature of the thermostat hot spot was not reached -14℃, and finally the internal leakage of the evaporator was detected. Compressor exhaust efficiency drops, refrigerators, supermarket refrigerated showcaseevaporators too much refrigeration oil, capillary oil clogged, dirty, the refrigerator door is not tightly closed, too thick frost layer will cause poor cooling. 3, rust, air leakage, self-coiling copper pipe length is too small, it will cause poor cooling and high power consumption. If fluorine is added according to the theoretical value or the return air pressure value of the normal machine, the temperature at the bottom of the evaporator will be high and no frost will form. At this time, it is necessary to add refrigerant, so that the low pressure pressure rises, the evaporation temperature rises, the return pipe is frosted, the current value increases, and the thermostat is not easy to stop automatically.
4. The length of the capillary tube is very important. is to make the refrigerator and supermarket refrigerated showcase reach the corresponding refrigeration standard. To reduce the noise of refrigerant flow, it is necessary to accurately measure the length of the capillary tube. For example, refrigerators and supermarket refrigerated showcases using R12 refrigerant, under the condition that the process tube and the air return tube are open.
connect a pressure gauge in series between the condenser and the capillary tube, turn on the refrigerator,The pressure gauge indicates 1.2MPa~1.4MPa (the pressure of Baixue supermarket refrigerated showcaseis 1.35MPa). When the new capillary tube is just intercepted, the pressure is 0.1MPa~0.15MPa lower than the standard value. In order to increase the degree of refrigeration, the capillary tube with the remaining length should be placed on the return pipe. The more turns, the greater the resistance, and it will rise to the standard pressure value when retesting. The process of measuring the capillary tube also checked the discharge performance of the compressor. Refrigerators using green refrigerants such as R152a, R600a, R134, etc., due to longer capillary tubes and strict requirements for moisture, the capillary length should be determined by the method of measuring capillary flow with nitrogen.
5. Refrigerants cannot be misused. The length of the capillary tube of the compressor is designed according to the refrigerant used. Wrong use will lead to poor cooling and increased power consumption, and heavy use will not work and burn the compressor. If the refrigerator using R12 refrigerant uses R152 (R22), it will make the compressor difficult to start, high current, and easy to damage the compressor. The refrigerator of R600a uses R12, it is difficult to start, cannot start when it is hot, and the working current increases.
6. Refrigerator, supermarket refrigerated showcase. Add refrigerant. Note the temperature requirements. After adding refrigerant, can't automatically start and stop and seal it in a hurry. It should be observed before sealing. If the ice is blocked, use scissors to cut the capillary at the filter drier to let the refrigerant spray out. Add 0.5MPa nitrogen to the process tube for 3 minutes, while using a welding torch to bake the compressor and evaporator, replace the dry filter immediately after stopping the gas, and connect another 10cm long capillary to the dry filter, close the process tube The valve is energized, and the refrigerator's own compressor is used to discharge the gas. If no gas is discharged from the capillary after one hour, the capillary tube is sealed and the refrigerant is added. company website: www.ihdjx.com branch company website: www.bing-gui.com: www.yymcp.com
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