Samsung AC NN4SEC Series, Руководство пользователя и инструкция по установке, Страница: 24 / 40

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Performing leak test & insulation
To identify potential gas leaks on the indoor unit, inspect the connection area
of each refrigerant pipe using a leak detector for R410A.
Before recreating the vacuum and recirculating the refrigerant gas, it is
advisable to pressurize the whole system with nitrogen (using a cylinder with
pressure reducer) at a pressure above 2 bar, less than 40 bar (gauge) in order
to immediately detect leaks on the refrigerant fittings.
Made vacuum for 15 minutes and pressurising system with nitrogen.
Leak test
CAUTION
• If the pipes require brazing ensure that OFN (Oxygen Free
Nitrogen) is flowing through the system.
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.
2 Wind insulating tape around the pipes and drain hose avoiding to
compress the insulation too much.
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.
5 Select the insulation of the refrigerant pipe.

Insulate the gas side and liquid side pipe referring to the thickness
according to the pipe size.

Indoor temperature of 30°C and humidity of less than 85% is the stan-
dard condition.
If installing in a high humidity condition, use one grade thicker insulator by
referring to the table below.
If installing in an unfavorable conditions, use thicker one.

Insulator’s heat-resistance temperature should be more than 120°C.
Insulation
No gap
NBR
CAUTION
• All refrigerant connection must be accessible, in order to
permit either unit maintenance or removing it completely.
NOTE
• Always make the seam of pipes face upwards.
Insulation cover pipe
Indoor unit
Be sure to overlap
the insulation
Insulation pipe
CAUTION
• Must fit tightly against
body without any gap.