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refrigerated showcase Daily reading: walk-in cooler The treatment of refrigerant before maintenance
Freezer maintenance work is generally divided into partial troubleshooting and planned overhaul. The content of the maintenance is different, and the steps and methods for handling the refrigerant are different. The methods are as follows.
1. The treatment method of ammonia in refrigeration equipment must be repaired in a low pressure facility
(1) Ammonia treatment method of partial equipment
1. Low pressure supermarket refrigerated showcase n0 nn 5 nn 6 nn 0 nn 5 nn 6 nn 0 nn 5 nn 6 nn 0 nn 0 It is clean and can only be repaired after the atmosphere is connected. In the process of dealing with ammonia, every operation step and link must be carefully and carefully checked to be foolproof and must not be careless, otherwise accidents or even serious accidents of personal injury may occur.
Steps:
(l) Preparation of safety tools:
Prepare gas masks, ventilators, rubber gloves, rubber hoses, wrenches and other fitter tools.
(2) Cut off the connection between the equipment in the accident and the equipment in normal operation. And put the closed valve on the prohibition sign, and record it clearly on the workshop record sheet.
(3) Select the ammonia line, the ammonia in the equipment to be repaired should be drained, if the evaporator should select the hot ammonia defrost return line, pump the ammonia to the drain or circulation barrel, and adjust the Put signs on the relevant valves to avoid errors in operation. If there is a leak in the low-pressure circulation barrel, it needs to be repaired. The ammonia is not easy to be cleaned. You can close the steam inlet valve and liquid supply valve of the circulation barrel after the ammonia is pumped. Connect the oil drain line to the atmosphere, let a small amount of ammonia liquid in the circulating barrel evaporate clean, then turn on the compressor, the machine is emptied, and the discharged gas can be put into the condenser pool or outdoor bucket through the vent valve and rubber tube.
(4) Power-on pump down. After the valve of the system pipeline is adjusted correctly, the ammonia compressor can be opened for evacuation. As long as there is no internal leakage of the closed valve, after 3-4 pumps, after 30 minutes, the pointer of the low pressure gauge rises slightly and is below OMPa, visible The device has been emptied. If is turned on and emptied several times, the pressure gauge pointer will read faster (5-10 minutes) and rise to above OMPa after stopping, which proves that the equipment under repairIf you can’t take time out, you should find out the reason, and after removing it, take time out. After the equipment being overhauled is evacuated, the equipment can be repaired only after all the work of connecting to the atmosphere is correct.
2. High-pressure walk-in cooler treatment method
The principle of handling ammonia during maintenance of high-pressure equipment is to be safe and not too wasteful. From the perspective of safety, it is best not to put high-pressure and high-temperature ammonia into low-pressure equipment, because putting it in low-pressure equipment increases the low-pressure pressure and the machine cannot be started, causing unsafe factors in the low-pressure equipment. For the liquid in the high-pressure equipment, it can be stored through related pipelines, for example, through the oil drain pipe to the oil collector, and then sent to the drain barrel or low-pressure circulation barrel through the pressure reducing pipe, so that the pressure of the low-pressure equipment will not be too high. It is safe and economical not to drain ammonia. ) After the ammonia liquid in the overhauled supermarket refrigerated showcase equipment is discharged into the low-pressure equipment, the remaining ammonia gas can pass through the relevant pipelines, such as the oil drain line and the drain valve of the oil collector (the pressure reducing valve should be closed) , Take the rubber hose and put it in the condenser pool or sewer. It is not necessary to turn on the compressor when handling such equipment.
refrigerated showcase refrigeration equipment is a professional company integrating design, manufacturing, sales and service. Products include: all kinds of fresh-keeping cabinets, display cabinets, display cooler, air curtain cabinets, deli cabinets, fresh meat cabinets, cold storage, etc., toll-free hotline: +86 18019567573
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