Step 8 Performing The Gas Leak Test; Step 9 Insulating The Refrigerant Pipes - Samsung AC RN DKG Series Installation Manual

Outer Diameter (mm)
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
NOTE
If the pipes must be shortened, see Step 6 Cutting
and flaring the pipes on page 14.
2 Be sure to use an insulator thick enough to cover the
refrigerant tube to protect the condensate water on
the outside of the pipe falling onto the floor and to
improve the efficiency of the unit.
3 Cut off any excess foam insulation.
4 Make sure that there are no cracks or waves on the
bent area.
5 It would be necessary to double the insulation
thickness (10 mm or more) to prevent condensation
even on the insulator when if the installed area is
warm and humid.
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 8 Performing the gas leak test

To identify potential gas leaks on the indoor unit, inspect
14 to 18
the connection area of each refrigerant pipe using a leak
detector for R-410A.
34 to 42
Before recreating the vacuum and recirculating the
49 to 61
refrigerant gas, pressurize the whole system with
nitrogen (using a cylinder with a pressure reducer) at a
68 to 82
pressure above 4 MPa in order to immediately detect
100 to 120
leaks on the refrigerant fittings.
Made vacuum for 15 minutes and pressurizing system
with nitrogen.
1 way Cassette
4 way Cassette

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.
Insulator
Insulator
No gap
NBR
Liquid side
Gas side
Liquid side
Gas side
15
English