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Commercial refrigeration stop function of refrigeration device
commercial refrigeration stop function of refrigeration device
normal stop
(1) Close the expansion valve or the main liquid supply valve to reduce the pressure of the evaporator for the next start. If the commercial refrigeration is a Freon system, the liquid reservoir or condenser outlet valve should be closed.
(2) Close the suction valve. When the pressure of the crankcase gauge drops to 0.03～0.05MPa, cut off the current and close the discharge valve. If the parking is improperly, the crankcase gauge pressure has dropped to negative pressure, causing the crankcase gauge pressure to rise above OMPa.
(3) Move the oil-immersed start varistor handwheel from running position to starting position . For the new series of products, the energy adjustment position should be moved to the n5
5n position.
(4) After 2 minutes to 3 minutes, turn off the cooling water system and chilled water system, stop the mixer, record the parking time and prepare for shift.
(5) If it is a long-term shutdown, except for fully enclosed refrigerators, the refrigerant should be collected and stored in the condenser or accumulator, that is, the accumulator or condenser outlet valve should be closed, and the evaporator should be closed. The refrigerant is withdrawn. At this time, except for the shut-off valve, gauge valve, equalizing valve, and liquid level indicator valve of the safety valve, all other valves are closed. Then eliminate the refrigerant leakage, do a good job of oil seals for machinery and equipment, and crank once every half month. For fluorine valves, in addition to pressing the stem packing, the bonnet should be tightened.
(6) For the shutdown of the two-stage ammonia compressor, the throttle valve of the regulating station should be closed first, the pressure of the
commercial refrigeration evaporator should be appropriately reduced, and then the liquid supply valve of the intercooler should be closed, and then the operation of the low pressure compressor should be stopped. When the intermediate pressure drops below 0.1MPa, stop the high-pressure machine. Other shutdown steps can refer to the single-stage compressor. When various refrigeration devices are shut down for a long time, the water in the system should be drained to prevent the equipment from freezing due to low ambient temperature. If you are in the south, you don't need to release water because of the high temperature, because the air enters after the water is released, and the corrosion to the inner wall of the pipe is more serious than when there is water.
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