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Extra Procedures
Pumping down refrigerant
WARNING
• 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.
– 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 purpose
• To transport the product or repair the indoor unit, run the
operation that recovers the refrigerant to the outdoor
unit, to minimise refrigerant leakage from the system.
Precautions during PUMP DOWN
• The amount of refrigerant that can be accommodated
by the outdoor unit is limited.
• Pump most of the refrigerant in the system into a
refrigerant recovery container, and then pump down
the left-over refrigerant only. The maximum amount of
refrigerant that can be accommodated by the outdoor
unit is the factory charge weight.
(any additional refrigerant charge that was adding
during installation must be pumped into a container).
• If the amount of refrigerant in the system exceeds the
maximum amount of accommodatable refrigerant, the
pressure increases, causing the compressor to trip or
become damaged.
Pumping down the refrigerant
• Prior to the PUMP DOWN operation, perform a primary
recovery of the refrigerant into an empty container.
• Lock the manifold gauge.
• Lock the service valve on the liquid pipe.
• Press the K2 button on the outdoor unit PCB three
times. (The outdoor unit PCB LED displays
• When the compressor starts operation, use the
manifold gauge to monitor the low pressure level.
• If the low pressure level decreases to 0 Mpa or lower,
immediately lock the service valve on the gas pipe and
end the PUMP DOWN operation. (To end the PUMP
DOWN operation, press either the K2 button or K3
button to reset the system.)
CAUTION
• Use a suitable recovery tank. If a common refrigerant
container is illegally modified, the container may
explode, causing injury or damage.
• If the compressor operates for an extended period of
time with a low pressure of 0 MPa(0 psi) or lower, the
compressor and/or circuit element may malfunction.
After checking the pressure level, immediately end the
PUMP DOWN operation.
• Do not perform the PUMP DOWN operation if there
is a refrigerant leak or the refrigerant piping is not
connected properly. Air enters the piping to increase
the internal pressure, causing an explosion or
malfunction.
Putting refrigerant in a refrigerant container
prior to PUMP DOWN
exceeds the maximum amount of accommodatable
refrigerant, perform a primary recovery of the
refrigerant into a refrigerant container, as follows, and
then perform the PUMP DOWN operation.
• Prepare a dedicated rechargeable refrigerant
container, scale and manifold gauge.
• Check the amount of refrigerant contained in the
whole system.
• Open the refrigerant container valve and valve
the manifold gauge connected to the liquid pipe, to
allow the refrigerant to flow from the liquid pipe to the
refrigerant container.
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