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Maintenance of display cooler Ten taboos (2)
Maintenance of display cooler Ten taboos
Do not suppress
If the pressure value does not drop, it is judged that the refrigeration pipeline is not leaking. When the display cooler is maintained, it is often encountered with a cooling difference, low refrigerant discharge and compression when deflating The machine exhaust is normal, and it is judged that the refrigeration pipeline is leaking. But after the total pressure is applied to the refrigeration pipeline and the pressure is maintained for 24 hours, sometimes the pressure gauge value does not drop. Some beginners mistakenly believed that the refrigeration pipeline was not wet or leaking, so they directly filled the refrigerant and delivered it to the user. However, the display cooler failed again after 2-6 months. [Note] The discharge amount of bleeder refrigerant is small and the total pressure does not leak. More than 80% of the high-pressure pipelines (anti-dew pipe, condenser) have leaks. Because the total pressure value is only 0.8 MPa, it cannot reach the 1.2 MPa required by the high-pressure pipeline pressure leak detection value.
Do not pay attention to the refrigerant model. The display cooler currently entering the maintenance period uses a variety of refrigerant models and cannot be replaced directly (some of them cannot be replaced at all). Observe the refrigerant model marked on the nameplate on the back of the display cooler before filling the refrigeration, otherwise it will cause unnecessary troubles such as poor cooling and affecting the life of the compressor. Example 3: An intern, after repairing a display cooler refrigeration system using R600a refrigerant, refilled R12 refrigerant, resulting in increased compressor noise and local overheating of the condenser.
Avoid incorrect use of welding rods. Silver welding rods are used for welding between copper and copper tubes, and brass welding rods are used for welding between copper and iron tubes. Otherwise, the welding quality will be poor or weak, causing secondary repairs. Example 4: A rework machine has poor cooling, and there is oil stains at the connection between the condenser and the compressor. After inspection, it was found that the weld was silver welding, which was caused by the wrong use of welding rod. Because the nozzle of the compressor is a copper pipe, and the condenser is a copper-plated iron pipe, a brass electrode should be used. [Note] Welding of refrigeration pipes is to heat the joints to a certain temperature (600℃ for silver electrodes and 1300℃ for brass electrodes), then put the welding rod and change the heating to the welding rod, so that the welding rod is fully melted and filled and sealed , Connect the gap. If the compressor and condenser use silver welding rod, the adhesion of the silver welding rod to the iron pipe is poor, resulting in poor welding firmness, and the display cooler leaks again at the welding place after 1 to 2 months of use.
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