Table of Contents
Pipe outside diameter
Width across
flats
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 3 times.
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.
Be sure to install the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the flare nut cannot 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.
Hold the torque wrench at its grip, keeping it at a right angle with the pipe, in order to
tighten the flare nut correctly.
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
5. FORMING THE DRAIN HOSE AND PIPE
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.
• Wrap the pipes of the indoor unit that are visible from the outside with decorative tape.
En-5
Width across flats of
[mm (in)]
Flare nut [mm]
6.35 (1/4)
17
9.52 (3/8)
22
12.70 (1/2)
26
15.88 (5/8)
29
19.05 (3/4)
36
CAUTION
CAUTION
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Tightening torque [N·m (kgf·cm)]
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1,100)
CAUTION
Cloth tape
(Accessories)
2 Right piping
3 Bottom piping
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
• 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.
[For 4 Left bottom piping, 5 Left piping and 6 Center piping, 7 Left rear
piping]
• Preset the end of the pipe.
• For
Center piping and,
Left rear piping route the connection pipes through the wall.
6
7
• Bend the connection piping to a bend radius not less than 100 mm and position the
piping no more than 35 mm from the wall.
• After passing the indoor unit piping and drain hose through the wall hole, hang the
indoor unit on the hooks at the top and bottom of the wall hook bracket.
Alignment marks
Wall
hook
bracket
Small piping (Liquid pipe)
Connection piping
Large piping (Gas pipe)
[Hang the indoor unit]
• Hang the indoor unit from the hooks at the top of the wall hook bracket.
• Insert the spacer, etc. between the indoor unit and the wall hook bracket and separate
the bottom of the indoor unit from the wall.
Indoor unit
Indoor unit
Wall hook bracket
Pipe (Top)
1 Rear piping
Drain hose (Bottom)
Bind with vinyl tape
CAUTION
Vinyl tape too tight
Top hooks
Bottom hook
Spacer
Table of Contents
