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Installation Procedure
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
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.
10
English
Step 6 Cutting and flaring the pipes
1
2 If you wish to shorten the pipes, cut it with a pipe cutter, taking
Liquid refrigerant port
3 To prevent any gas from leaking out, remove all burrs at the cut
4 Slide a flare nut on to the pipe and modify the flare.
Outer Diameter (D)
Make sure that you have the required tools available. (pipe cutter,
reamer, flaring tool and pipe holder)
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.
Pipe cutter
90°
90
Pipe
Oblique
edge of the pipe, using a reamer.
D
A
Pipe
Flare
Depth (A)
Ø1/4 (6.35)
0.051 (1.3)
Ø3/8 (9.52)
0.071 (1.8)
Ø1/2 (12.70)
0.079 (2.0)
Ø5/8 (15.88)
0.087 (2.2)
Ø3/4 (19.05)
0.087 (2.2)
Rough
Burr
R 0.016 to 0.032 inch
(R 0.4 to 0.8 mm)
D
L
Flare dimension (L)
0.34 ~ 0.36 (8.7 ~ 9.1)
0.50 ~ 0.52 (12.8 ~ 13.2)
0.64 ~ 0.65 (16.2 ~ 16.6)
0.76 ~ 0.78 (19.3 ~ 19.7)
0.93 ~ 0.94 (23.6 ~ 24.0)
Unit : inch (mm)
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