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Connecting Up and Removing Air In the Circuit
The outdoor units is loaded with sufficient R-22 refrigerant for 5 m(16 ft) of
piping. 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.
Adding Refrigerant
Refrigerant must be added if the piping measures more than 5 m(16 ft) in
length (maximum of “A” m/ft). The quantity of additional refrigerant is
variable according to the installation situation. Thus, make sure the outdoor
unit situation before adding refrigerant. This operation can only be performed
by a qualified refrigeration specialist.
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 wrench, applying the following torque.
Outer Diameter Torque (kgf•cm)
6.35 mm (1/4") 160
(11 ft•lb)
15.88 mm (5/8")
400
(29 ft•lb)
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 counter
clockwise.
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
maintaining a vacuum.
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(13ft•lb) 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
A
B
C
D
Outdoor unit Indoor unit
Gas pipe side
Liquid pipe side
3-way valve
A(gas)
B(liquid)
Vacuum
pump
Model
ACC2400C
ACC2800C
A
30m
(100ft)
a
40g
(0.43oz)
B
b
50g
(0.54oz)
For details about the installation
situation(a or b), refer to page 44.
☛
If you have used... Then...
More than 5 m(16 ft)
of the pipes
“B” of refrigerant (R-22) must be
added for each extra metre.
Less than 5 m(16 ft)
of piping
The purge time is normal
E-
49
ENGLISH
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