Connecting Up And Purging The Circuit - Samsung AJ009JNNDCH Service Manual

7-2 Connecting Up and Purging the Circuit

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 right figure. Each unit must be purged in turn.
AJ020JCJ2CH/AJ024JCJ3CH/AJ036JCJ5CH
1 Check the piping connections.
2 Connect the charging hose of low pressure side of manifold
gauge to the packed valve having a service port (5/8" Packed
valve) as shown at the figure (Value stem: 1/2" - 20UNF).
Make the electrical connection and leave the system
into "stand by mode". Do not turn on the system! This is
WARNING
necessary for better vacuum operation (full OPEN position
of Electronic Expansion Valve - EEV -).
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
30 minutes.
- Close the valve of the low pressure side of manifold gauge
clockwise.
- Make sure that pressure gauge show -0.1MPa(-76cmHg) after
about30 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
torque wrench.
7 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.
Samsung Electronics
A
B
C
Vacuum
Pump
Valve stem
Stem cap
Service port
7-3