Samsung AM14A1E07, Service Manual

Page: 62 / 74

Samsung Electronics
3-13
Operating Instructions and
3-2-2(g) Air-Purging
Vacuum Pump
Indoor
A-unit
Indoor
B-unit
Liquid side
Gas side
Stem cap
Valve stem
Service port
The air in 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 right figure. Each unit must be purged in turn
CAUTION
1. Check the piping connections
3. Open the valve of the low pressure side of Manifold
gauge counterclockwise.
6. 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.
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 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 mani-
fold gauge.
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.
5. Set valve cork of both liquid side and gas side of
packed valve to the open position.
2. Connect the charging hose of low pressure side of
Manifold gauge to the packed valve having a service
port (3/8” or 1/2” Packed valve) as shown at the right