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HOW AIR ENTERS INSIDE THE REFRIGERATION SYSTEM AND HOW TO REMOVE IT??

Air entering inside refrigeration system: Air can enter the refrigeration system through a leak in the low side of the refrigeration system.

Air entering inside refrigeration system


Air can enter the refrigeration system through a leak in the low side of the refrigeration system. Refrigerant leaks will eventually lead to an undercharged system. Severely undercharged systems can run vacuums on the low side of the system.  These vacuums will pull in air from the atmosphere because the low-side (suction) pressure is lower than the atmospheric pressure. Air may enter the refrigeration system through leaks in the tube, gasket, or flange; poor charging procedures; poor recovery-recycling procedures; or forgetting to purge hoses when accessing systems.
Air entering inside refrigeration system
Effects of Air in Refrigeration Plant Refrigeration compressor outlet temperature high Condenser outlet temperature high Condenser discharge pressure high Presence of small bubbles in the sight glass  High amp drawn.
Air entering inside refrigeration system


Procedure to remove air from the refrigeration system: If air gets into a system, it will collect in the top of the condenser and be trapped. Air is a non-condensable and cannot be condensed like refrigerant vapors. Air will cause a reduction of condensing surface area. Therefore it is very important to extract non- condensable gas. To check if air or other non condensable gas exists in the refrigerant circuit, pump down the refrigerant gas into the condenser. Then start colling and wait until cooling water temperature become equal to the inlet and outlet temperature of the condenser. At this time, if there is any difference between the saturated pressure corresponding to cooling water temperature and condensing pressure, then non condensable gas must exist.
Air entering inside refrigeration system
Procedure to remove air from the refrigeration system: Pump down the refrigerant gas into the condenser after closing condenser outlet valve and by running compressor. [Procedure already discussed in my video about gas charging procedure for refrigeration system.] Stop the compressor when the suction pressure is just above zero if compressor is on manual mode or it will stop on low pressure switch activation. Close the suction valve for compressor. Supply sufficient cooling water to the condenser so that the refrigerant can be condensed as as possible. Bleed air slowly by opening purging valve on condenser and collect it in the recovery bottle. Repeat the procedure until condensing pressure become saturated pressure.
Air entering inside refrigeration system


Air entering inside refrigeration system





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