Connecting up and removing air in the circuit
E-
1
4
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, reduce to cooling capacity and
could lead to a malfunction. Refrigerant for air purging is not charged in the
outdoor unit. Use Vacuum Pump as shown at the figure.
Connect each assembly pipe to the appropriate valve on the outdoor unit
and tighten the flare nut.
1
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
Torque (kgf•cm)
6.35 mm (1/4")
140~170
9.52 mm (3/8")
250~280
12.70 mm (1/2")
380~420
15.88 mm (5/8")
440~480
19.05 mm (3/4")
990~1210
22.23 mm (7/8")
990~1210
2
Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a service port as shown at the figure.
3
Open the valve of the low pressure side of manifold gauge
counterclockwise.
4
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 show -0.1MPa(-76cmHg) after about
10 minutes.
This procedure is very important in order to avoid gas leak.
◆
Turn off the vacuum pump.
◆
Remove the hose of the low pressure side of manifold gauge.
5
Set valve cork of both liquid side and gas side of packed valve to the
open position.
6
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.
7
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.
8
Outdoor unit
Indoor unit
Gas pipe side
Liquid pipe side
Vacuum
pump
A
B
C
D
B(liquid)
Valve stem
