En-6
4.3.3. Pipe connection
(1) Remove
the
fi
lter guide.
Indoor unit
Filter guide
(2) Attach the connection pipe.
Indoor unit
Large pipe
Small pipe
• For
2
Top piping and
3
Right piping connections, use the Auxiliary pipe (Gas pipe)
provided.
2
Top piping
Connection pipe (Gas)
Indoor unit (Rear)
Connection pipe (Gas)
3
Right piping
Auxiliary pipe (Gas pipe)
(Accessories)
CAUTION
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.
Tighten the
fl
are nuts with a torque wrench using the speci
fi
ed tightening method.
Otherwise, the
fl
are nuts could break after a prolonged period, causing refrigerant to
leak and generate hazardous gas if the refrigerant comes into contact with a
fl
ame.
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.
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Tighten with 2 wrenches.
Holding wrench
Flare nut
Flare nut [in. (mm)]
Tightening torque [lbf·ft. (N·m)]
1/4 (6.35) dia.
11.8 to 13.3 (16 to 18)
3/8 (9.52) dia.
23.6 to 31.0 (32 to 42)
1/2 (12.70) dia.
36.1 to 45.0 (49 to 61)
5/8 (15.88) dia.
46.5 to 55.3 (63 to 75)
3/4 (19.05) dia.
66.4 to 81.1 (90 to 110)
CAUTION
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.
1
4.4. Installing heat insulation
Install the heat insulation material after performing a refrigerant leak check (see the Instal-
lation Manual for the outdoor unit for details).
COUPLER HEAT INSULATION
• Insulate by the coupler heat insulation (Accessories) around the gas pipe and liquid
pipe of indoor side.
• After installing the coupler heat insulation, wrap both end with vinyl tape so that there is
no gap.
• After af
fi
xing the coupler heat insulation, secure it with 2 binders, one on each end of
the insulation.
• Make sure that the binders overlap the heat insulation pipe.
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).
CAUTION
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.
Indoor unit
Indoor unit
Indoor unit
Coupler heat insulation (Large)
(Accessories)
Connection pipe (Gas)
Connection pipe (Small) (Liquid)
Coupler heat insulation (Small)
(Accessories)
Binder (Extra large)
(Accessories)
No gap
Coupler heat insulation
Binder (Large)
(Accessories)
Connection pipe (Gas)
Connection pipe (Liquid)
Vinyl tape
• When using an auxiliary pipe, make sure that the fastener used is insulated in the same
way.
9367702091-02_IM.indb En-6
9367702091-02_IM.indb En-6
12/29/2011 8:57:43 AM
12/29/2011 8:57:43 AM