Connecting Up And Removing Air In The Circuit - Samsung AC NX S C Series Installation Manual

Connecting up and removing air in the circuit

AA
CAUTION
• W hen 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 injur y.
The air in the indoor unit and in the pipe must be purged. If air remains in the refrigeration pipes, it will affect
the compressor either reduce cooling/heating capacity or lead to a malfuction. 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 opposite, tighten the flare nut on section
B first manually and then with a torque wrench, applying the following
torque.
Outer Diameter (D)
ø6.35 mm(1/4")
ø9.52 mm(3/8")
ø12.70 mm(1/2")
ø15.88 mm(5/8")
ø19.05 mm(3/4")
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
• M ake the electrical connection and leave the system into
"stand by mode". Do not turn on the system.
This is necessary to speed up vacuum operation (full OPEN
position of Electronic Expansion Valve - EEV -).
4. Open the valve of the low pressure side(A) of manifold gauge
counterclockwise.
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 -0.1MPa(-76cmHg) 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. Set valve cork of both liquid side and gas side of packed valve 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 gas leakage.
 At this time, especially check for gas leakage from the 3-way valve's
stem nuts(A port), and from the service port cap.
Torque (N•m)
14 ~18
34 ~ 42
49 ~ 61
68 ~ 82
100 ~ 120
Outdoor unit
(Gas)
A
(Liquid)
B
Vacuum
 T he designs and shape are subject to
change according to the model.
B(liquid)
C
D
pump
A(gas)
English 21