Step 9 Performing The Gas Leak Test - Samsung AJ NCJ2EG Series Installation Manual

4 Open the valve of the low pressure side of manifold
gauge counter clockwise.
5 Purge the air from the system using vacuum pump for
about 30 minutes.
• Close the valve of the low pressure side of manifold
gauge clockwise.
• Make sure that pressure gauge show -0.1MPa(-
76cmHg) after about 1 hour. This procedure is very
important in order to avoid gas leak.
• Turn off the vacuum pump.
• Remove the hose of the low pressure side of
manifold gauge.
6 Set spindle of both liquid side and gas side of stop
valve to the open position.
7 Mount the valve stem nuts and the service port cap to
the valve, and tighten them with a torque wrench.
Outer diameter
(mm)
Body cap (N•m)
ø 6.35 20 to 25
ø 9.52 20 to 25
ø 12.70 25 to 30
ø 15.88 30 to 35
Tightening torque
Charging port
cap (N•m)
10 to 12

Step 9 Performing the gas leak test

Before completing the installation (insulation of the
cables, hose and piping and fixing of the indoor unit to the
installation plate), you must check that there are no gas
leaks.
To check for
gas leaks on Then, using a leak detector,check the ...
the...
Outdoor unit Valves on sections A and B.
Flare nuts at the end of sections C and
Indoor unit
Outdoor unit
A(Gas)
B(Liquid)
• The designs and shape are subject to change according
to the model.
LEAK TEST WITH NITROGEN (before opening valves)
In order to detect basic refrigerant leaks, before
recreating the vacuum and recirculating the R-32, it is
the responsibility of the installer to pressurize the whole
system with nitrogen (using a cylinder with pressure
reducer) at a pressure above 4 MPa (gauge).
LEAK TEST WITH R-32 (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 R-32.
Once you have completed all the connections, check for
possible leaks using leak detector specifically designed for
HFC refrigerants.
D.
Indoor unit
C D
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