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4.3.3. Pipe connection
Connect the silencer pipe to the small (liquid) pipe.
Centering the pipe against port on the indoor unit, turn the fl are nut with your hand.
Be sure that the small pipe is completely installed before connecting the large pipe.
Indoor unit side
Be sure to install the pipe against the port on the indoor unit and the outdoor unit
correctly. If the centering is improper, the fl are nut cannot tightened smoothly. If the
fl are 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 fl ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
If necessary, cut the silencer pipe and use it.
Hold the torque wrench at its grip, keeping it at a right angle with the pipe, in order to
tighten the fl are nut correctly.
When the fl are nut is tightened properly by your hand, hold the body side coupling with a
separate spanner, then tighten with a torque wrench.
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [in. (mm)]
1/4 (6.35) dia.
3/8 (9.52) dia.
1/2 (12.70) dia.
5/8 (15.88) dia.
3/4 (19.05) dia.
Silencer pipe
(Accessories)
CAUTION
Silencer pipe
(Accessories)
CAUTION
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Tightening torque [lbf·ft. (N·m)]
11.8 to 13.3 (16 to 18)
23.6 to 31.0 (32 to 42)
36.1 to 45.0 (49 to 61)
46.5 to 55.3 (63 to 75)
66.4 to 81.1 (90 to 110)
] 1
4.4. Installing heat insulation
After checking for gas leaks (refer to the Installation Manual of the outdoor unit),
perform this section.
Install heat insulation around both the large (gas) and small (liquid) pipes. Failure to
do so may cause water leaks.
After checking for gas leaks, insulate by wrapping insulation around the 2 parts (Gas and
Liquid) of the indoor unit coupling, using the coupler heat insulation.
After installing the coupler heat insulation, wrap both ends with vinyl tape so that there is
no gap.
Secure both ends of the heat insulation material using Cable tie (Large).
And fi nally fi x connection pipe (Liquid) to connection pipe (Gas) by rolling vinyl tape over
coupler heat insulation (Gas) and coupler heat insulation (Liquid).
Indoor unit
No gap
Coupler heat
insulator
(Accessories)
Gas pipe Liquid pipe
Silencer pipe
Insulation (pipe)
(Accessories)
There should be no gaps between the insulation and the unit.
5. INSTALLING DRAIN HOSE
]
Install the drain hose in accordance with the instructions in this Installation Manual
and keep the area warm enough to prevent condensation. Problems with the piping
may lead to water leaks.
Use general hard polyvinyl chloride pipe and connect it with adhesive (polyvinyl chloride)
so that there is no leakage.
Always heat insulate the indoor side of the drain hose.
Use a drain pipe that matches the size of the drain hose.
• Do not perform a rise, trap and air bleeding.
• Provide a downward gradient (1/100 or more).
• Provide supporters when long pipes are installed.
• Use an insulation material as needed, to prevent the pipes from freezing.
• Install the pipes in a way that allows for the removal of the control box.
Drain pipe
When using the drain port on the left side of the unit, remove the drain cap and install it to
the right side drain port.
(Only when suspended from the ceiling)
Unit
CAUTION
Cable tie (Large)
(Accessories)
Coupler heat insulator
(Accessories)
Be sure to overlap the
insulation
Cable tie (Large)
(Accessories)
No gap
Coupler heat
insulation
No gap
Small pipe
CAUTION
CAUTION
O.D.
Φ 3/4 in. (19 mm) [I.D.],
Φ 1-1/16 in. (27 mm) [O.D.]
Drain cap
En-6