17
English
Instal
lation Pr
oc
edur
e
Step 5 Purging inert gas from the indoor
unit
From factory the unit is supplied and set with a pre-charge
of nitrogen gas. (inert gas) Therefore, all inert 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.
Gas
refrigerant port
Liquid refrigerant
port
NOTE
• The designs and shape are subject to change according
to the model.
• 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
• 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 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.
Step 6 Cutting and flaring the pipes
1
Make sure that you have the required tools available. (pipe
cutter, reamer, flaring tool and pipe holder)
2
If you wish to shorten the pipes, cut it with a pipe cutter,
taking care to ensure that the cut edge remains at a 90°
angle with the side of the pipe. Refer to the illustrations
below for examples of edges cut correctly and incorrectly.
90°
Pipe cutter
Pipe
Oblique Rough Burr
3
To prevent any gas from leaking out, remove all burrs at the
cut edge of the pipe, using a reamer.
4
Slide a flare nut on to the pipe and modify the flare.
D
A
90° ±2°
D
L
45
°
±2
°
Pipe
Flare
R 0.4 to 0.8 mm
Outer Diameter
(D)
Depth (A)
Flare dimension
(L)
Ø6.35 mm
1.3 mm
8.7~9.1 mm
Ø9.52 mm
1.8 mm
12.8~13.2 mm
Ø12.70 mm
2.0 mm
16.2~16.6 mm
Ø15.88 mm
2.2 mm
19.3~19.7 mm
Ø19.05 mm
2.2 mm
23.6~24.0 mm
