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Remove the gas and liquid
service port caps
Gas service port
<Low pressure>
Liquid service port
<High pressure>
Step 3.3 Evacuating the air
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
evacuate 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.
Use a vacuum pump.
CAUTION
• 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 stop 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.
46 English
Control box
Remove the screw for
the control box cover
For connecting the
refrigerant pipes
Connect the gas and liquid
refrigerant pipes
1. Leave the system in the standby mode.
WARNING
• Do not turn on the system! This is necessary for
better vacuum operation (full OPEN position of
Electronic Expansion Valve).
2. Connect the charging hose of the low
pressure side of manifold gauge to a gas
service port as seen in the picture.
3
Valve
4
(Backward flowing prevention)
Liquid service port <Low pressure>
5
Liquid service port <High pressure>
3. Open the valve of the low pressure side of
manifold gauge anticlockwise.
4. Evacuate the air in the connected pipes
using the vacuum pump for about 15
minutes.
• Make sure that pressure gauge shows -0.1 MPa
(-76 cmHg, 5 torr) after about 10 minutes. This
procedure is very important to avoid a gas leak.
• Close the valve of the low pressure side of manifold
gauge clockwise.
• Turn off the vacuum pump.
• Check for 2 minutes if there is any pressure change.
• Remove the hose of the low pressure side of
manifold gauge.
15 minutes
Vacuum
Pump
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