23
EN
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LIS
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Connecting the refrigerant pipe
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 & 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.
Outer Diameter
Torque (kgf•cm)
6.35 mm (1/4”)
9.52 mm (3/8”)
12.70 mm (1/2”)
15.88 mm (5/8”)
19.05 mm (3/4”)
145~175
333~407
505~615
630~769
990~1210
Note
If the pipes must be shortened refer to page
24.
2 Must use insulator which is thick enough to cover the
refrigerant tube to protect the condensate water on the
outside of pipe falling onto the floor and the efficiency of
the unit will be better.
3 Cut off any excess foam insulation.
4 Be sure that there must be no crack or wave on the
bended area.
5 It would be necessary to double the insulation
thickness(10mm or more) to prevent condensation even
on the insulator when if the installed area is warm and
humid.
6 Do not use joints or extensions for the pipes that
connect the indoor and outdoor unit. The only permitted
connections are those for which the units are designed.
Refrigerant oil
Spanner
Union
Torque wrench
Flare nut
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),
suitable for operating pressures of at least 4200kPa and for a burst pressure of at least 20700kPa.
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.
CAUTION
Summary of Contents for NS 4CREA Series
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