AIR Purging

This procedure is used to remove air from inside the piping connecting the indoor and outdoor units, as well as the air inside the indoor unit. If air purging is not carried out, air will beocme mixed into the refrigerant cycle, causing the pressure to rise to abnormally high levels, increasing power consumption and reducing the capacity of the unit. Also, moisture in the air can cause insulation failure in the compressor motor and deterioration of the refrigerant oil, resulting in a significant reduction in the air conditioner life.

The procedure is as follows:

!Confirm that all piping connections have been completed correctly.

!Connect a gauge manifold and a vacuum pump as shown in the diagram.

!Completely open the low-pressure valve of the gauge manifold and completely close the high-pressure valve.

!Start the vacuum pump and allow it to operate until the pressure is at 29” of vacuum. This will take about 15 minutes or more.

!With the low-pressure valve completely open, switch off the vacuum pump.

!Completely open both the suction and liquid service valves.

!Disconnect the manifold.

!Tighten the caps on the service valves and the flange nut on the charging port.

	Gauge Manifold
Low pressure	High pressure
valve	valve

Narrow pipe service valve

Wide pipe

service valve

Vacuum pump