Trane MWW509IB Installation Manual page 23

Air purging and leakage test
1. Remove the flare nuts from the
service valves of the outdoor unit.
2. Align the center of the piping flare
with the relevant valve, and screw
in the flare nut about 3-4 turns by
hand.
3. Tighten the flare nut with spanner
and torque wrench.
4. Remove the valve caps of the gas
valve and liquid valve and the
service port nut.
5. Loosen the valve stem of the liquid
valve with a hex wrench.
6. Push the check valve core of the
gas valve to discharge air and
moisture remaining in the refrige-
rant system.
7. After discharge time which take
around 15 seconds, stop pushing
the valve core as soon as the
refrigerant starts to be discharged,
and reinstall the service port nut.
8. Open the liquid valve and gas valve
entirely (shown in Figure 14).
9. Tighten the valve caps and test
leakage at all joints of the piping
(both indoor and outdoor) with
liquid soap or leak detector.
10.If possible, discharge air and
moisture remaining in the
refrigerant system with a vacuum
pump. (shown in Figure 15)
MCW - SVN13A - E4
CAUTION!
Exceeding tightening torque will
damage the flare surface.
Gas line
Liquid
line
Wrong wiring connection will
cause electrical mal - function.
Do not pull the wire when fixing it
with wire clamp.
Screwdriver
Check valve
Liquid line valve
Figure 14
Valve cap
Liquid line Gas line
Figure 15
CAUTION!
Gas line valve
Pressure gauge
Vacuum pump
23