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English
Installation Pr
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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 (609.2 psi)
and for a burst pressure of at least 20.7 Mpa (3002.3 psi).
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
(2.9 to 7.25 psi).
Step 8 Performing the gas leak test
To identify potential gas leaks on the indoor unit, inspect
the connection area of each refrigerant pipe using a leak
detector for R-410A.
Before recreating the vacuum and recirculating the
refrigerant gas, pressurize the whole system with
nitrogen (using a cylinder with a pressure reducer) at
a pressure above 4 MPa [594.7 psig (gauge)] in order to
immediately detect leaks on the refrigerant fittings.
Made vacuum for 15 minutes and pressurizing system
with nitrogen.
Insulator
Gas side
Liquid side
Step 9 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
NBR
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
Insulation cover pipe
Be sure to overlap the insulation.
Insulation pipe
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
unit with the outdoor unit must be fixed to the wall
with suitable ducts.
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Summary of Contents for AC BN6DCH Series
Page 40: ......
