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Supermarket refrigerated showcase How to install refrigeration equipment
Supermarket refrigerated showcase Installation of refrigeration equipment
Supermarket refrigerated showcase The characteristics and particularities of refrigeration system The installation of refrigeration equipment is different from the installation of other mechanical equipment, and has its particularity. The installation of refrigeration equipment in supermarket refrigerated showcase is not only difficult, but also has more auxiliary equipment and involves a wide range of work types. Such as pipe, clamp, welding, electricity, wood, tile, bitumen, etc., and there are special requirements as follows.
(1) All equipment such as pipelines are pressure vessels. Under normal circumstances, the pressure it receives is several to ten times higher than atmospheric pressure, and the changes are large. Some equipment sometimes works under vacuum, so all There should be certain strength requirements.
(2) Freon refrigerant is colorless, odorless, and highly permeable. It is very easy to penetrate and leak from small and tight places, and it is not easy to be found. Ammonia refrigerant is toxic, flammable and explosive, so the air tightness of all equipment, components and pipe fittings is very high.
(3) The oxide scale, welding slag and other impurities inside the equipment and connecting pipelines must be cleaned up, otherwise it will cause the cylinder, piston, air valve, expansion valve and oil pump to wear out quickly, or cause blockage, and make supermarket refrigerated The showcase refrigeration unit is not working properly.
(4) Freon is insoluble in water. If the system contains water, it will freeze in the low temperature part of the system and form an ice plug. For this reason, the system must be highly dry. The equipment and pipes that have been cleaned and dried should be strictly sealed one by one and stored properly. During the installation, do not open the freon side of the machine and equipment for a long time to avoid the infiltration of moisture in the air. After the system is installed, the air tightness test should be done carefully, and the non-condensable gas and moisture in the system must be fully removed before charging the refrigerant.
(5) Freon is generally soluble in oil R12 and infinitely soluble in oil, R22 and oil are soluble in limited, so lubricating oil is often circulated in the system together with supermarket refrigerated showcase refrigerant. When installing the pipeline, it should be considered that the lubricating oil can return to the crankcase well, otherwise the lubricating oil will be deposited in the pipeline, increasing the flow resistance, or causing the lubricating oil to accumulate on the heat transfer surface of the condenser and evaporator, forming an oil film , Worsening heat transfer, reducing the cooling effect, and even causing the compressor to lose oil, resulting in damage to bearings and sliding parts. Due to the particularity of the above-mentioned refrigeration devices, every small link should be paid attention to when installing.
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