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5
REFRIGERANT PIPING
If the refrigerant gas leaks during installation work, ventilate the room.
If the leaked refrigerant gas comes to contact with a fire, the noxious gas may generate.
After installation work, check that the refrigerant gas does not leak.
If the refrigerant gas leaks in the room and comes to contact with a fire such as fan heater, stove, or kitchen
range, the noxious gas may generate.
Connection of refrigerant pipe
1. The refrigerant pipe connecting section is set in the
outdoor unit. Remove the front panel and the
piping/wiring panel. (M5: 9 pcs.)
• As shown in the right figure, the hooking hooks
are attached at right and left sides each on the
front panel.
Lift up and remove the front panel.
2. Pipes can be drawn out forward and downward
from the outdoor unit.
3. When drawing out the pipe forward, draw out the
pipe to outside via piping/wiring panel, and keep
space of 500mm or more from the main pipe
connecting the outdoor unit with the indoor unit,
considering service work, etc. (For replacing the
compressor, 500mm or more space is required.)
4. When drawing out the pipe downward, remove the
knockout of the base plate of the outdoor unit, apply
the pipe to outside of the outdoor unit, and perform
piping at right/left or rear side. Leading pipe of the
balancing should be within 4m.
For brazing, be sure to use nitrogen gas to avoid oxidation of pipe inside.
1. In a welding work for the refrigerant pipes, be sure to use the nitrogen gas in order to prevent oxidation inside
of the pipes; otherwise clogging of the refrigerating cycle due to oxidized scale generates.
2. Use clean and new pipes for the refrigerant pipes
and perform piping work so that water or dust is
not mixed.
3. Be sure to use a double spanner to loosen or
tighten the flare nut. If a single spanner is used, a
required tightening cannot be obtained. Tighten
the flare not with the specified torque.
WARNING
(Left piping)
Packed valve
at liquid side
REQUIREMENT
Outer dia. of copper pipe
6.4 mm
9.5 mm
12.7 mm
15.9 mm
8
Piping/wiring panel
(Right
(Rear piping)
piping)
Drawing out
forward
(Right piping)
(Left piping)
Drawing out
downward
Ball valve at discharge gas side
Tightening torque (N•m)
14 to 18 (1.4 to 1.8 kgf-m)
33 to 42 (3.3 to 4.2 kgf-m)
50 to 62 (5.0 to 6.2 kgf-m)
68 to 82 (6.8 to 8.2 kgf-m)
Hook
Front panel
Packed valve at
suction gas side
Packed valve at
balance side
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