18
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Installation (Cont.)
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:
• Tighten the flare nuts using two
wrenches, taking care not to
damage the pipes (Fig. 17).
• If the tightening torque is not
sufficient, there will probably be
some leakage. With excessive
tightening torque there may also
be some leakage, as the flange
could be damaged.
• The best way to tighten the
connections is using a fixed
wrench and a torque wrench, as
illustrated in Fig. 12 on page 15.
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
(Fig. 18). Detailed instructions
follow on the next page.
Fig. 17
Connection pipes
Flare nuts
Liquid tap
Gas tap
Liquid valve
Indoor unit
Gas valve
Protection caps
Service port nut
Fig. 18
Service port
Vacuum pump
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