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) = 1975.
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.
• 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.
Evacuating the connected pipes
1. Connect each assembly pipe to the appropriate valve on the outdoor unit and
tighten the flare nut.
2. Tighten the flare nut first with your hands, and then with a torque wrench,
applying the following torque.
Outdoor unit
Indoor unit
Gas pipe side
Liquid pipe side
• Excessive torque can be cause of gas leakage.
3. Connect the charging hose of the low-pressure side of manifold gauge to a
gas service port as seen in the picture.
4. Open the valve of the low pressure side of manifold gauge counterclockwise.
5. 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) 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.
6. Set a valve cork of liquid and gas service port to the open position.
Vacuum
Pump
Manifold gauge
Valve
Gas service port
<Low pressure>
Liquid service port
<High pressure>
(Backward flowing
prevention)
Outer
Diameter
Torque
N•m
kgf•cm
ø6.35 mm
14~18
140~180
ø9.52 mm
34~42
350~430
ø12.70 mm
49~61
500~620
ø15.88 mm
68~82
690~830
• 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 -).
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