20
English
Installation
Step 3.3 Evacuating the air
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 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.
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
4
5
(Backward flowing prevention)
Liquid service port <Low pressure>
Vacuum
Pump
Valve
15 minutes
Liquid service port <High pressure>
Control box
Remove the screw for the
control box cover
For connecting the
refrigerant pipes
Remove the gas and liquid
service port caps
Gas service port
<Low pressure>
Liquid service port
<High pressure>
Connect the gas and liquid
refrigerant pipes
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