Samsung AJ038RCJ4EC, Installation Manual

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15
A Connecting up and purging the circuit
The outdoor unit is loaded with sufficient R-410A refrigerant.Do not vent R-410A into atmosphere: it is a fluorinated greenhouse
gas, covered by Kyoto Protocol, with a Global Warming Potential (GWP) = 2088.
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.
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.
1. Check the piping connections.
2. Connect the charging hose of low pressure side of manifold gauge to
the stop valve having a service port (5/8” Packed valve) as shown at the
figure (Value stem: 1/2” - 20UNF).
3. Open the valve of the low pressure side of manifold gauge
counter clockwise.
4. 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
30 minutes. 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.
5. Set spindle of both liquid side and gas side of stop valve to the open
position.
6. Mount the valve stem nuts and the service port cap to the valve, and
tighten them at the torque of 183kgf•cm with a torque wrench.
7. Check for gas leakage.
- At this time, especially check for gas leakage from the 3-way valve’s
stem nuts, and from the service port cap.
◆ 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 -).
WARNING
Vacuum
Pump
R-22: Diameter of the
screw-7/16-20UNF
R-410A: Diameter of the
screw-1/2-20UNF
Charging core
Charging port cap
Tightening torque for body cap
(Refer to the table)
Spindle