Step 8 Connecting Up And Removing Air In The Circuit - Samsung AC RXAD G Series Installation Manual

Installation Procedure
Step 8 Connecting up and removing air
in the circuit
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 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.
The air in the indoor unit and in the pipe must be
evacuated. If air remains in the refrigerant pipes, it will
affect the compressor either reduce cooling/heating
capacity or lead to a malfunction. Refrigerant for air
purging is not charged in the outdoor unit. Use Vacuum
Pump as shown at the right figure.
1 Connect each assembly pipe to the appropriate valve
on the outdoor unit and tighten the flare nut.
2 Referring to the illustration below, tighten the flare
nut on section D first manually and then with a
torque wrench, applying the following torque.
Outdoor Unit
C
Outer Diameter (mm)
ø6.35
ø9.52
ø12.70
ø15.88
ø19.05
22
English
A (Gas)
B (Liquid)
D
⋅
Torque (N m)
14 to 18
34 to 42
49 to 61
68 to 82
100 to 120
3 Connect the charging hose of low pressure side of
manifold gauge to the packed valve having a service
port as shown at the figure.
CAUTION
• The designs and shape are subject to change
according to the model.
4 Open the valve of the low pressure side(A) of
manifold gauge anticlockwise.
Outdoor Unit
5 Purge the air from the system using vacuum pump
for about 10 minutes.
• Close the valve of the low pressure side of
manifold gauge clockwise.
• 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.
• Turn off the vacuum pump.
• Remove the hose of the low pressure side of
manifold gauge.
6 Open the stop valve of both liquid and gas sides.
7 Mount the valve stem nuts and the service port cap to
the valve, and tighten them at the torque of
18 N⋅m with a torque wrench.
Vacuum
Pump
A(Gas)
B(liquid)