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Installation Procedure
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 4.2 MPa and
for a burst pressure of at least 20.7 MPa. 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.
•
If the pipes require brazing, make sure that oxygen free
nitrogen (OFN) is flowing through the system.
•
Nitrogen blowing pressure range is 0.02 to 0.05 MPa.
Step 7 Performing the gas leak test
LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before
recreating the vacuum and recirculating the R-410A, it's
responsable of installer to pressurize the whole system
with nitrogen (using a cylinder with pressure reducer) at
a pressure above 40 bar (gauge).
LEAK TEST WITH R-410A (after opening valves)
Before opening valves, discharge all the nitrogen into
the system and create vacuum. After opening valves
check leaks using a leak detector for refrigerant R410A.
AC036/048/054TNCDKC
NOTE
•
The designs and shape are subject to change according
to the model.
10
English
Step 8 Insulating the refrigerant
pipes
Once you have checked that there are no leaks in the
system, you can insulate the piping and hose.
1 To avoid condensation problems, place Acrylonitrile
Butadien Rubber separately around each refrigerant
pipe.
No gap
NOTE
•
Always make the seam of pipes face upwards.
2 Wind insulating tape around the pipes and drain hose
avoiding compressing the insulation too much.
Indoor unit
CAUTION
•
Be sure to wrap insulation tightly without any gaps.
3 Finish wrapping insulating tape around the rest of the
pipes leading to the outdoor unit.
4 The pipes and electrical cables connecting the indoor
Leak check
unit with the outdoor unit must be fixed to the wall with
suitable ducts.
NBR
Insulation cover pipe
Insulation pipe
Be sure to overlap the insulation.
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