Pump Down Procedure; Using Service Valve - Samsung AC Series Installation Manual

Using service valve

To Open the Service Valve
1. Open the body cap and turn the spindle counterclockwise by using a
hexagonal wrench.
2. Turn it until the spindle is stopped.
• Do not apply excessive force to the service valve and always use
special instruments. Otherwise, the stopping box can be damaged
NOTE
and the back sheet can leaks.
• If the watertight sheet leaks, turn the spindle back by half, tighten
the stopping box, then check the leakage again. If there is no
leakage any more, tighten the spindle entirely.
3. Tighten the body cap securely.
To Close the Service Valve
1. Remove the body cap.
2. Turn the spindle clockwise by using a hexagonal wrench.
3. Tighten the spindle until the valve reached the sealing point.
4. Tighten the body cap securely.
• When you use the service port, always use a charging hose, too.
• Check the leakage of refrigerant gas after tightening the body cap and the service port cap.
CAUTION
• Must use a spanner and wrench when you open/tighten the service valve.

Pump down Procedure

Pump down will be carried out when an evaporator is replaced or when the unit is relocated in another area.
• After installing the product, be sure to perform leak tests on the piping connections. After pumping down refrigerant
to inspect or relocate the outdoor unit, be sure to stop the compressor and then remove the connected pipes.
WARNING
- Do not operate the compressor while a valve is open due to refrigerant leakage from a pipe or an
unconnected or incorrectly connected pipe. Failure to do so may cause air to flow into the compressor and
too a high pressure to develop inside the refrigerant circuit, leading to an explosion or product malfunction.
Pump-down is an operation intended to collect all the system refrigerant in the outdoor unit. This operation must be carried
out before disconnecting the refrigerant pipe in order to avoid refrigerant loss to the atmosphere.
1. Turn the system on in cooling with fan operating at high velocity and
then let the compressor run for more than 5 minutes. (Compressor will
immediately start, provided 3 minutes have elapsed since the last stop.)
2. Release the valve caps on High and Low pressure side.
3. Use L-wrench to close the valve on the high pressure side.
4. After approximately 2 minute, close the valve on the low pressure side.
5. Stop operation of the air conditioner by pressing the (Power) button on
the indoor unit or remote control.
6. Disconnect the pipes.
Spindle
Body
cap
Sealing point
Service port
Service port cap
B(liquid)
Flare nut
A(gas)
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