COMPLETING THE INSTALLATION
Purging the Connected Pipes
The outdoor unit is loaded with sufficient R410A refrigerant.Do not vent R410A
into atmosphere: it is a fluorinated greenhouse gas, covered by Kyoto Protocol,
with a Global Warming Potential (GWP) = 1975.
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
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:
Outer Diameter Torque (kgf•cm)
6.35 mm 140~170
9.52 mm 25
0~280
12.70 mm 380~420
15.88 mm 440~480
19.05 mm 990~1210
22.23 mm 990~1210
WARNING:
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 -).
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
Purge the air in the connected pipes using the vacuum pump at least 15 minutes.
- Close the valve of the low pressure side of manifold gauge clockwise;
- Make sure that pressure gauge shows -0.1MPa(-76cmHg) after 15 minutes are
elapsed; This procedure is very important to guarantee correct system perfor
-
mance and reliability;
- Turn off the vacuum pump.
- 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.
7
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.
8
Check for a gas leak paying particular attention to the 3-way valve’s stem nuts
and to the service port cap.
Outdoor unit Indoor unit
Gas pipe side
Liquid pipe side
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