In the daily operation of the chiller, it is easy for air to enter the refrigeration system. Because the low temperature in the refrigeration system will not condense the air, it will affect the heat dissipation of the condenser, causing the condensing pressure to rise, and the chiller cannot Perform normal operation. Therefore, it is necessary to discharge the air in the chiller to maintain the normal operation of the chiller.
Flue gas system venting operation steps of Freon system
Close the reservoir outlet valve or the condenser outlet valve;
Start the compressor and collect the refrigerant in the low pressure section into the condenser or the accumulator;
Stop after the pressure of the low pressure system drops to a stable vacuum state;
Loosen the bypass plug of the exhaust cut-off valve, and rotate it about half a turn. The exhaust valve stem makes the valve three-way, allowing high-pressure gas to escape from the bypass hole.
The palm is blocked from the exhaust airflow. When the hand feels cool and there is oil on the hand, it means that the air has been basically drained, the screw plug should be tightened, the exhaust valve stem should be reversed, and the bypass hole should be closed.
It should be noted that each deflation time should not be too long, and can be carried out continuously for 2-3 times to avoid wasting refrigerant. Air can also be vented directly from the valve if the top of the condenser or reservoir is equipped with a backup shut-off valve.
Chlorine venting operation steps of ammonia refrigeration system
When air is released by the air separator, the air return valve of the air separator is placed in the normally open state to reduce the pressure of the air separator to the suction pressure, and the other valves should be closed.
Properly open the mixed gas intake valve to allow the mixed gas in the chiller refrigeration system to enter the air separator.
The liquid supply valve is slightly opened, so that the ammonia liquid is throttled into the air separator to vaporize and absorb heat, and the mixed gas is cooled.
Connect the rubber hose for the air valve connection so that one end is inserted into the water in the water container. When the ammonia in the mixed gas is cooled to ammonia, the bottom of the air separator will be frosted, and the air valve can be opened slightly to discharge the air through the water container.
If the bubble rises in the water, it has a circular shape and no volume change. If the water does not rise, the water temperature does not rise, and the air is released. In this case, the opening of the air release valve should be appropriate.
The ammonia in the mixed gas is gradually condensed into ammonia and accumulated at the bottom. The liquid level height can be seen from the frosting condition of the outer casing. When the liquid level reaches 12, the liquid supply throttle valve is closed and the liquid return throttle valve is opened.
The bottom ammonia solution is returned to the air separator to cool the mixed gas. After the underlying frost layer is about to melt, close the liquid return throttle valve to open the liquid supply throttle valve.