26
PIPELINES CONNECTION & AIR PURGING
No dust or any other particles, air or moisture should be
allowed to enter the air conditioning system. Careful attention
should be paid when pipeline connection for outdoor unit is
made. Try to avoid repeated curves as much as possible;
otherwise, damage to the copper pipes may occur. Suitable
wrenches should be used when the pipeline connection is
done so as to ensure appropriate torque (refer to torque
table).
Excessive torque action might damage the joints while too
little torque might lead to leakage.
Minimum bent radius 100 mm
Peel about 10 cm - 15cm of the thermal insulation sleeve in
out-pipe and in-pipe of indoor unit in preparation for pipe
connections. First connect the low-pressure pipe and after this
the high-pressure pipe. Press the surface of the pipe against
the connector vertically, twist the connectors to the bottom of
the bolt and finally tighten them with a torque wrench.
AIR PURGING WITH VACUUM PUMP
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
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 valve of the low pressure of
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, following the torque table