In the daily operation of industrial chiller, it is very easy for air to enter the refrigeration unit because the ultra-low temperature in the refrigeration unit is not easy to solidify air into liquid, which instead will damage the heat dissipation of the cooler, causing an increase in the working pressure of the condensation and making the industrial chiller machine unable to function normally. Therefore, it is necessary to remove the air in the industrial chiller machine to maintain its normal operation.
Close the discharge valve of the liquid storage tank or the discharge valve of the cooler.
Start the refrigeration compressor and inject the refrigerant into the cooler or the liquid storage tank in the low-pressure segment.
After the gas pressure in the low-pressure system software is stable at the vacuum pump, shut down.
Loosen the plug of the buried hole next to the exhaust pipe shut-off valve and turn it in the clockwise direction for two turns top and bottom, and the automatic exhaust valve rod makes the valve into a three-way shape so that the high-pressure gas can escape from the buried hole. Block the exhaust vortex with your hand. When you feel cold air and oily stains in your hand, it indicates that the air has been basically exhausted. You should tighten the plug, turn the automatic exhaust valve rod counterclockwise, and close the buried hole.
Note that each time the air is released, the time should not be too long. It can be carried out 2-3 times continuously to prevent the consumption of refrigerant. If there is a shut-off valve reserved at the top of the cooler or the liquid storage tank, air can also be released from the valve.
When releasing air with an air separator, place the return air valve of the air separator in the on and off position to make the gas pressure of the air separator reach the breathing working pressure, and close other valves.
Open the mixed gas bypass valve moderately to allow the mixed gas in the industrial water chiller refrigeration unit to enter the air separator.
Slightly open the liquid supply valve to allow the ammonia liquid throttling valve to enter the air separator and vaporize to absorb heat and react with the refrigeration mixed gas.
Connect the sulfurized rubber hose used for the exhaust valve plug and insert one end into the water in the water container. When the ammonia in the mixed gas is cooled into liquid ammonia, frost will appear at the bottom of the air separator. At this time, the exhaust valve can be slightly opened to discharge the air according to the water container. If the bubbles rise in the water in a circular shape without a change in volume and the water is not turbid and the temperature does not rise, it indicates that air is released, and the opening degree of the exhaust valve should be appropriate.
The ammonia in the mixed gas slowly cools into liquid ammonia and accumulates at the bottom. The height-to-width ratio of the liquid level gauge can be seen from the frosty condition of the shell. When the liquid level gauge reaches 12, close the liquid supply throttling valve and open the liquid receiving throttling valve to make the bottom layer of liquid ammonia flow back to the air separator to refrigerate the mixed gas. When the bottom frost layer is about to melt and end, close the liquid receiving throttling valve and open the liquid supply throttling valve.
When stopping the release of air, first close the exhaust valve to prevent nitrogen dioxide from leaking, and then close the liquid supply throttling valve and the mixed gas bypass valve. In order to better avoid the increase of working pressure inside the air release device, the check valve should not be closed.