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5. FORMING THE DRAIN HOSE AND
PIPE
CAUTION
• Do not remove the flare nut from the indoor unit pipe until
immediately before connecting the connection pipe.
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will
break.
[For
1
Rear piping,
2
Right piping and
3
Bottom piping]
• Install the indoor unit piping in the direction of the wall hole
and bind the drain hose and pipe together with vinyl tape.
• Install the piping so that the drain hose is at the bottom.
Pipe (Top)
Cloth tape
2
Right piping
3
Bottom piping
Bind with vinyl tape
Drain hose (Bottom)
1
Rear piping
CAUTION
• Do not wrap the tape too tightly on drain hose. If the
tape is too tight (as shown in the Figure below) the
insulation effect will be lost and the moisture from
condensation may accumulate.
Bad Example
Vinyl tape too tight
• Perform “6. ELECTRICAL WIRING” before performing this
piping.
• Wrap the pipes of the indoor unit that are visible from the
outside with cloth tape.
• After passing the indoor piping and drain hose through the
wall hole, hang the indoor unit on the hooks at the top of the
wall hook bracket.
Wall hook bracket
Indoor unit
Top hooks
[For
4
Left rear piping,
5
Left piping and
6
Center
piping]
• Preset the end of the pipe.
• For
4
Left rear piping and
6
Center piping, route the
connection pipes through the wall.
• Bend the connection piping to a bend radius not less than
100 mm and position the piping no more than 50 mm from
the wall.
4.3.2. Bending pipes
The pipes are shaped by your hands or pipe bender. Be
•
careful not to collapse them.
Do not bend the pipes in an angle more than 90°.
•
When pipes are repeatedly bend or stretched, the material
•
will harden, making it difficult to bend or stretch them any
more. Do not bend or stretch the pipes more than three
times.
CAUTION
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will
break.
4.3.3. Pipe connection
When the flare nut is tightened properly by your hand, hold
the body side coupling with a separate spanner, then tighten
with a torque wrench.
CAUTION
• Hold the torque wrench at its grip, keeping it in the right
angle with the pipe, in order to tighten the flare nut
correctly.
• Tighten the flare nuts with a torque wrench using the
specified tightening method. Otherwise, the flare nuts
could break after a prolonged period, causing refrigerant
to leak and generate a hazardous gas if the refrigerant
comes into contact with a flame.
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Tighten with two wrenches.
Holding wrench
Flare nut
CAUTION
• Be sure to apply the pipe against the port on the indoor
unit and the outdoor unit correctly. If the centering is
improper, the flare nut cannot be tightened smoothly.
If the flare nut is forced to turn, the threads will be
damaged.
• Do not remove the flare nut from the indoor unit pipe until
immediately before connecting the connection pipe.
• Do not use mineral oil on flared part. Prevent mineral
oil from getting into the system as this would reduce the
lifetime of the units.
Flare nut [mm (in.)] Tightening torque [N·m (kgf·cm)]
6.35 (1/4) dia.
16 to 18 (160 to 180)
9.52 (3/8) dia.
32 to 42 (320 to 420)
12.70 (1/2) dia.
49 to 61 (490 to 610)
15.88 (5/8) dia.
63 to 75 (630 to 750)
19.05 (3/4) dia.
90 to 110 (900 to 1,100)
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