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Purging the unit
From factory the unit is supplied and set with a pre-charge of nitrogen gas
(insert gas). Therefore, all insert gas must be purged before connecting the
assembly piping.
Unscrew the pinch pipe at the end of each refrigerant pipe.
Result:
All inert gas escapes from the indoor unit.
Note
To prevent dirt or foreign objects from getting into the pipes
during installation, do NOT remove the pinch pipe completely until
you are ready to connect the piping.
CAUTION
C onnect 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.
F or sizing and limits (height difference, line length, max. bends,
refrigerant charge, etc.) see the outdoor unit installation manual.
A ll refrigerant connection must be accessible, in order to
permit either unit maintenance or removing it completely.
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 tube must be clean & has no dust.
The connection procedure for the refrigerant pipes varies according to the
exit position of the pipes from the indoor unit, as seen when facing the indoor
in the "A" side.
Liquid refrigerant port
Gas refrigerant port
Drain hose connection port
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
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")
Note
If the pipes must be shortened refer to page 12.
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.
Torque (N•m)
18
42
55
65
100
C
I
OMPLETING THE
NSTALLATION
The designs and shape are subject to
change according to the model.
I
I
NSTALLING THE
A
Liquid refrigerant port
Gas refrigerant port
Drain hose connection port
The designs and shape are subject to
change according to the model.
U
NDOOR
NIT
15
E-
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