Connecting Up And Purging The Circuit - Samsung AS18A1QC Owner's Instructions & Installation Manual

Connecting Up and Purging the Circuit

Outdoor unit
Gas pipe side
A
Liquid pipe side
B
B
(liquid)
Valve stem
Model
18
24
38
E-
The outdoor unit is loaded with sufficient R-22 refrigerant for 16.4 feet
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 malfuction.
Refrigerant for air purging is not charged in the outdoor unit. Use Vacuum
Pump as shown at the figure.
1
Indoor unit
C
2
D
3
4
5
Vacuum Pump
6
7
A
(gas)
8
Adding Refrigerant
Stem cap
Refrigerant must be added if the piping measures more than 5 metres in length
(maximum of 10 metres). This operation can only be performed by a qualified
refrigeration specialist.
A
0.2 oz
0.3 oz
Refer to the Service Manual for more details on this operation.
Connect each assembly pipe to the appropriate valve on the outdoor unit
and tighten the flare nut.
Referring to the illustration opposite, tighten the flare nut first manually
and then with a wrench, applying the following torque.
Pipe Outer Diameter
Liquid refrigerant 6.35 mm (1/4")
Gas refrigerant 12.70 mm (1/2")
Gas refrigerant 15.88 mm (5/8")
Connect the charging hose of low pressure side of manifold gauge to the
packed valve having a service port as shown at the figure.
Open the valve of the low pressure side of manifold gauge counter-
clockwise.
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
- 10minutes.
- 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.
Set valve cork of both liquid side and gas side of packed valve to the open
position.
Mount the valve stem nuts and the service port cap to the valve, and
tighten them at the torque of 18N•m with a torque wrench.
Check for gas leakage.
- At this time, especially check for gas leakage from the 3-way valve's
stem nuts, and from the service port cap.
If you have used...
More than 16.4'
of piping
Less than 16.4'
of piping
Torque (kg . cm)
3
160 (11 ft lb)
•
5
2
(36 ft lb)
500
•
5
3
(50 ft lb)
700
•
5
Then...
"A" of refrigerant (R22)
must be added for each
extra foot.
The purge time is normal.