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6-2 Installation tools
Be sure to use dedicated tools so that the air conditioner will
maintain proper pressure resistance and the contamination of
impurities will be prevented.
Compatibility with conventional tools (other refrigerants)
Name
Compatibility
Pipe cutter
Pipe bender
Expander
(pipe expansion
tool)
6-3 Protection against contamination when
installing pipes
Protect the piping to prevent moisture, dirt, dust, etc. from entering
the piping.
Place
Installation period
More than a month
Outdoor
Less than a month
Indoor
Regardless of the period
Note
Exercise special caution to prevent dirt or dust when passing piping
through holes in walls and when passing pipe edges to the exterior.
6-4 Pipe connection
• Be sure to perform nitrogen permutation or nitrogen blow when
brazing.
Refrigerant pipe
Location to
be brazed
Nitrogen
Taping
Handy valve
Brazing without performing nitrogen permutation or nitrogen blow
into the piping will create large quantities of oxidized film on the
inside of the pipes, adversely affecting valves and compressors in
the refrigerating system and preventing normal operation.
• The pressure regulator for the nitrogen released when doing the
brazing should be set to 0.02 MPa (about 0.2kg/cm
feel a slight breeze on your cheek).
Note
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
6
Remarks
• Use a cutter suitable to the pip-
ing thickness.
• Use a different elbow sold as
an optional accessory if the
bending radius needs to be
reduced.
• Use a different elbow sold as
an optional accessory for the
bending portions of pipes with
a diameter of 15.9mm.
• Use a different socket sold as
an optional accessory for pipes
with a diameter of 15.9mm,
however, due to difficulty in
expanding them.
Protection method
Pinch the pipe
Pinch or tape the pipe
Regulator
Nitrogen
2
:Enough to
6-5 Connecting the refrigerant piping
1.
Derection to bring out the pipes
The local interunit piping can be connected either forward or to
the sides (taken out through the bottom) as shown in the following
figure.
When passing out through the bottom, use the knock hole in the
bottom frame.
Front connection
Left-side connection
Precautions when knocking out knock holes
• Open knock hole in the base frame by drilling the 4 concave
around it with a 6mm bit.
Knock hole
Drill
• Be sure to avoid damaging the casing
• After knocking out the holes, we recommend you remove any
burrs and paint them using the repair paint to prevent rusting.
• When passing electrical wiring through the knock holes, protect
the wiring with a conduit or bushings, making sure not to damage
the wiring.
2.
Removing Pinch Piping
In the case of connecting refrigerant piping to the outdoor unit,
remove the span piping as in the following procedure.
Refer to "Operation method of shutoff valve" for handling of the
shutoff valve.
Procedure 1
Confirm the shutoff
valve is closed.
Procedure 4
Melt the brazing material with a burner and
On-site piping
remove the pinch piping (large) after the gas
in the pinch piping is discharged.
Pinch piping
(Large)
Pinch piping
Cut off
(Small)
Part of pinch piping datail figure
Right-side connection
Concave section
(4 places)
Procedure 2
Connect a charge hose to
the service port of the
liquid side and gas side
shutoff valves and remove
the gas from the pinch piping.
Pinch piping (Small)
Procedure 3
Cut off the pinch piping (small) with
an appropriate tool, such as a pipe
cutter, and open the cross section to
check that there is no residual oil.
Note: If oil comes out of the cross
section, cut off the pinch piping
(large) with a pipe cutter and remove
the pinch piping.
English
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