Duramaxx 10028499 Mode D'emploi page 57

Connecting the pipes
Screw the flare nuts to the outdoor unit coupling
with the same tightening procedures described for
the indoor unit.
To avoid leakage, pay attention to the following
points.
1. Tighten the flare nuts using two wrenches.
Pay attention not to damage the pipes.
2. If the tightening torque is not sufficient,
there will probably be some leakage. With
excessive tightening torque there will also be
some leakage, as the flange could be dam-
aged.
3. The surest system consists in tightening the
connection by using a fix wrench and a torque
wrench (in this case use the table later on).
Bleeding
Air and humidity left inside the refrigerant circuit
can cause compressor malfunction. After having
connected the indoor and outdoor units, bleed the
air and humidity from the refrigerant circuit by
using a vacuum pump.
1. Unscrew and remove the caps from the
2-way and 3-way valves.
2. Unscrew and remove the cap from the ser-
vice port.
3. Connect the vacuum pump hose to the ser-
vice port.
4. Operate the vacuum pump for 10 - 15 min-
utes until an absolute vacuum of 10 mm Hg
has been reached.
5. With the vacuum pump still in operation,
close the low-pressure knob on the vacuum
pump coupling. Stop the vacuum pump.
6. Open the 2-way valve by 1/4 turn and then
close it after10 seconds. Check all the joints
for leaks using liquid soap or an electronic
leak device.
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