13
Ins
tallation Pr
oc
edur
e
English
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 or flaring the pipes
1
Make sure that you prepared the required tools.
(pipe cutter, reamer, flaring tool and pipe holder)
2
If you want to shorten the pipe, cut it using a pipe cutter
ensuring that the cut edge remains at 90° with the side
of the pipe. There are some examples of correctly and
incorrectly cut edges below.
Pipe cutter
Pipe
Oblique
90°
Rough
Burr
3
To prevent a gas leak, remove all burrs at the cut edge of
the pipe using a reamer.
4
Carry out flaring work using flaring tool as shown below.
<Flaring tool>
Clutch type
Die
Copper pipe
Flare nut
Copper pipe
York
Die
A
Wing nut type
(Unit: mm)
Outer
diameter
A
Flare tool for
R410A clutch
type
Conventional flare tool
Clutch type
Wing nut
type
6.35
0~0.5
1.0~1.5
1.5~2.0
9.52
0~0.5
1.0~1.5
1.5~2.0
12.70
0~0.5
1.0~1.5
1.5~2.0
15.88
0~0.5
1.0~1.5
1.5~2.0
Summary of Contents for AE071MNMPEH
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