26
English
Installation Procedure
Instal
lation Pr
oc
edur
e
Step 7 Connecting the assembly pipes to
the refrigerant pipes
There are two refrigerant pipes of different diameters :
• A smaller one for the liquid refrigerant.
•
A larger one for the gas refrigerant. The inside of
copper pipe must be clean and has no dust.
1
Remove the pinch pipe on the pipes and connect the
assembly pipes to each pipe, tightening the nuts, first
manually and then with a torque wrench, a spanner
applying the following torque.
2
3
3
1
Torque
wrench
Flare nut
Spanner
Union
Outer Diameter (mm)
Torque (N•m)
Ø6.35
14 to 18
Ø9.52
34 to 42
Ø12.70
49 to 61
Ø15.88
68 to 82
(1 N•m=10 kgf•cm)
NOTE
• If the pipes must be shortened, see
Step 6 Cutting
and flaring the pipes
on page
25
.
2
Be sure to use an insulator thick enough to cover the
refrigerant tube to protect the condensate water on
the outside of the pipe falling onto the floor and to
improve the efficiency of the unit.
3
Cut off any excess foam insulation.
4
Make sure that there are no cracks or waves on the
bent area.
5
It would be necessary to double the insulation
thickness (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 4.2 MPa
and for a burst pressure of at least 20.7 MPa. 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 require brazing, make sure that oxygen
free nitrogen (OFN) is flowing through the system.
• Nitrogen blowing pressure range is 0.02 to 0.05 MPa.
