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English
Installation
Pumping down for removing the product
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 tubing in order to avoid refrigerant
loss to the atmosphere.
WARNING
•
After installing the product, be sure to perform
leak tests on the piping connections. Before
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.
1
Hold down the (Power) button on the indoor
unit for 5 seconds. Beep sounds immediately to
indicate that the product is ready for pump down
procedure.
2
Let the compressor run for more than 5 minutes.
3
Release the valve caps on High and Low pressure
side.
4
Use L-wrench to close the valve on the high
pressure side.
5
After approximately 1 minute, close the valve on
the low pressure side.
6
Stop operation of the air conditioner by pressing
the (Power) button on the indoor unit or
remote control.
7
Disconnect the pipes.
CAUTION
•
Compressor damage may occur if the compressor
is run at a negative suction pressure.
1
2
Performing the gas leak tests for repair
In case of repair of the refrigerant circuit, the
following procedure must be kept to consider
flammability.
1.
Remove the refrigerant.
2.
Purge the refrigerant circuit with inert gas.
3.
Perform evacuation.
4.
Purge the circuit again with inert gas.
5.
Open the circuit.
6.
Perform repair work.
7.
Charge the system with refrigerant.
8.
Flush the system with nitrogen blowing for
safety.
9.
Repeat the previous steps several times until no
refrigerant is within the system.
CAUTION
•
Compressed air or oxygen shall not be used.
•
Flush the system with nitrogen blowing, fill the
refrigerant until the working pressure is reached,
ventilate to atmosphere, and then pull down to a
vacuum state.
•
For the final nitrogen blowing charge, the system
shall be ventilated down to atmospheric pressure.
Maintenance Procedures
Liquid service port
<High pressure>
Gas service port
<Low pressure>
Off
1 minute
