38
AIR PURGING WITH VACUUM
PUMP
Please note this should be completed
for each refrigerant circuit (each
indoor unit)
1.
Check that pipelines connection
have been properly connected,
remove the charging port cap, and
connect the manifold gauge and
the vacuum pump to the charging
valve using service hoses as
shown
2.
Open the valve on the low-
pressure side of the manifold
gauge, then run the vacuum pump.
Vacuum the indoor unit and the
connecting pipes until the pressure
in them lowers to below 1.5mmHG
(The operation time for vacuuming
is about 10 minutes). When the
desired vacuum is reached, close
the low pressure valve on the
manifold and stop the vacuum
pump.
3.
Disconnect the service hoses and
fit the cap to the charging valve.
4.
Remove the blank caps, and fully
opens the spindles of the 2-way
and 3-ways valves with a service
valve wrench.
5.
Tighten the blank caps of the 2-
way and 3-ways valves, applying
the torque listed in the table above.
GAS LEAKAGE INSPECTION
After the pipeline connection is done, use a leakage inspection device to carefully check
if there is any leakage at the joints. This is an important step to ensure the quality of
installation. Once a leak is detected, proper action should be taken immediately.