Step 8 Connecting Up And Removing Air In The Circuit - Samsung AJ NCJ2EG Series Installation Manual

Installation Procedure
• If the pipes require brazing ensure that OFN(Oxygen
Free Nitrogen) is flowing through the system.
• Nitrogen blowing pressure range is 0.02 to 0.05 MPa.
• If you need a pipe longer than specified in piping codes
and standards, you must add refrigerant to the pipe.
Otherwise, the indoor unit may freeze.
• While removing burrs, put the pipe face down to make
sure that the burrs do not get in to the pipe.
Step 8 Connecting up and removing air
in the circuit
WARNING
• When installing, make sure there is no leakage. When
recovering the refrigerant, ground the compressor first
before removing the connection pipe. If the refrigerant
pipe is not properly connected and the compressor
works with the service valve open, the pipe inhales the
air and it makes the pressure inside of the refrigerant
cycle abnormally high. It may cause explosion and injury.
The outdoor unit is loaded with sufficient R-32 refrigerant.
Do not vent R-32 into atmosphere: it is a fluorinated
greenhouse gas, covered by Kyoto Protocol, with a Global
Warming Potential (GWP) = 675.
You should purge the air in the indoor unit and in the
pipe. If air remains in the refrigerant pipes, it affects the
compressor. It may cause reduction of cooling capacity
and malfunction. Refrigerant for air purging is not
charged in the outdoor unit. Use Vacuum Pump as seen
in the picture.
1 Check the piping connections.
2 Connect the charging hose of low pressure side of
manifold gauge to the packed valve having a service
port .
Model Name
AJ040NCJ2EG
AJ050NCJ2EG
20
English
Valve
3/8'' 1/2''
2 -
CAUTION
• Make the electrical connection and leave the system
into "stand by mode". Do not turn on the system! This
is necessary for better vacuum operation (full OPEN
position of Electronic Expansion Valve - EEV -).
INDOOR A UNIT
INDOOR B UNIT
Tightening torque for body cap
(Refer to the table)
Charging
core
R-22: Thread of the screw - 7/16-2OUNF
R-410A/R-32: Thread of the screw -1/2-2OUNF
Tightening torque for charging port cap (Refer to the table)
Vacuum
Pump
Spindle