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Ammonia supermarket refrigerated showcase refrigeration system air release program
ammonia supermarket
refrigerated showcase refrigeration system air release program
(1) First Open the mixed gas inlet valve to let the mixture of non-condensable gas and ammonia in the supermarket
refrigerated showcase condenser enter the air separator (before opening the mixed gas inlet valve, the air separator is in a standby state), and then close the mixed gas inlet valve when it does not enter.
(2) Open the return valve to make the coil communicate with the suction port of the refrigerator.
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(3) Then slightly open the expansion valve, so that the ammonia liquid is decompressed into the coil through the expansion valve to evaporate and absorb the heat of the mixed gas, so that the ammonia in the mixed gas is condensed into liquid When it sinks, the air gathers on the upper part.
(4) wait a while, open the air valve and vent. After the air is released, close the air valve and expansion valve. Then slightly open the liquid return valve to reuse the ammonia liquid condensed in the supermarket
refrigerated showcase, and finally close the liquid return valve and the air return valve to restore the original state of the air separator. If it is not completed once, it can be repeated according to the above methods and procedures. The above is the air release step of the vertical air separator, which is also applicable to the double-pipe air separator.
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precautions when discharging air
(1) the expansion valve cannot be opened too large, because the coil area is limited , In order to prevent incomplete evaporation, the supermarket
refrigerated showcase refrigerator produces wet compression. The opening size of the expansion valve can be adjusted according to theCooler exhaust temperature can be adjusted. Generally, the frosting of the return air pipe does not exceed 21. If the suction pressure of the refrigerator is high, the return air pipe may not be frosted. At this time, the control exhaust temperature should not be lower than 70°C.
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(2) the mixed gas inlet valve should be fully opened to reduce the resistance of the mixed gas into the air separator.
(3) To promote the condensation of ammonia in the mixed gas, improve air separation efficiency, reduce ammonia loss, and ensure that the environment is not polluted, the air valve should be opened smaller . The opening degree of the air release valve can be adjusted according to the air bubbles in the bucket. If the bubbles rise in a circular shape without volume changes, and the water temperature does not rise, air is released. Since ammonia is easily soluble in water, if the volume of the released bubbles becomes smaller and the smell of ammonia overflows, the water gradually turns white, and the sound of firecrackers can be heard in the water, the air release valve should be closed. If it is a Freon system, there is no special venting equipment. Therefore, please be careful not to let air enter the system as much as possible at ordinary times. If there is air, you should stop it (preferably before the morning shift), and open the vent valve on the top of the condenser of the supermarket refrigerated showcase or the discharge valve of the refrigerator. The air is released from the highest point. Touch the gas with your hands. If it is cold, continue to release it. If there is a feeling of cold air, it means that there is fluorine running out, and the plug should be plugged. It should be pointed out here that when the fluorine condenser is vented, the fluorine gas that ran out is often overheated gas, which may not necessarily feel cold. Therefore, when the system is vented, you should first make a clear judgment on whether there is air in the system, and vent when there is indeed air, otherwise freon will be wasted.
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