11
English
Installation Procedure
Step 7 Connecting the assembly pipes to
the refrigerant pipes
There are two refrigerant pipes of different diameters :
• A smaller one for the liαuid refrigerant.
• A larger one for the gas refrigerant. The inside of
copper pipe must be clean and has no dust.
1 Remove the pinch pipes and connect the assembly
pipes. First tighten the flare nuts manually and then
with a torαue wrench and a spanner applying the
following torαue.
Outer Diameter Torque
mm inch N•m lbf.ft
Ø6.35 1/4 14 to 18 10.3 to 13.3
Ø9.52 3/8 34 to 42 25.1 to 31.0
Ø12.70 1/2 49 to 61 36.1 to 45.0
Ø15.88 5/8 68 to 82 50.2 to 60.5
(1 N•m=10 kgf•cm)
NOTE
• If the pipes must be shortened, see Step 6 Cutting
and flaring the pipes on page 10.
2 Use insulation that is thick enough to cover the
refrigerant pipe to prevent condensate water on
the outside of pipe and to ensure system efficiency.
Condensation can drip onto the floor causing property
damage or a slip hazard.
3 Cut off any excess foam insulation.
4 Make sure that the bent sections of pipe are not
kinked or cracked.
5 It is necessary to double the insulation thickness (0.39
inch or more,10 mm or more) to prevent condensation
even on the insulator when if the installed area is
warm and humid.
CAUTION
• Connect the indoor and outdoor units using pipes with
flared connections (not supplied). For the lines, use
insulated, unwelded, degreased and deoxidized copper
pipe (Cu DHP type to ISO 1337 or UNI EN 12735-1),
suitable for operating pressures of at least 4.2MPa
and for a burst pressure of at least 20.7MPa. Copper
pipe for hydro-sanitary applications is completely
unsuitable.
• For sizing and limits (height difference, line length,
max. bends, refrigerant charge, etc.) see the outdoor
unit installation manual.
• All refrigerant connection must be accessible, in order
to permit either unit maintenance or removing it
completely.
• If the pipes reαuire brazing, make sure that oxygen
free nitrogen (OFN) is flowing through the system.
• Nitrogen blowing pressure range is 0.02 to 0.05 MPa.
Spanner
Union
Torαue
wrench
Flare nut
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