8
7. Installing refrigerant piping
(5) Press the pipe covers
3
and
5
on the liquid piping against the unit and wrap
to hold in place. (Fig. 7-4)
(6) Press the pipe covers
4
and
6
on the gas piping against the unit and wrap to
hold in place. (Fig. 7-4)
(7) Apply the supplied bands
9
at a position 7/16-13/16 inch (10 - 20 mm) from
each end of the pipe covers (
3456
).
(8) If the indoor unit is not connected,
fi
t the supplied pipe covers (with caps,
7
and
8
) to the branch box refrigerant piping connections against the unit to
prevent condensation dripping from the pipes. (Fig. 7-5)
(9) Clamp the pipe covers (
78
) in place with the supplied bands
9
.
G
H
J
F
Note:
A special
fl
are nut (optional or attached to the indoor unit) is needed to
some indoor units.
Please refer to the installation manual of outdoor unit and indoor unit for
details.
F
Band
(3.1 Accessories No.
9
)
G
Pipe covers
(3.1 Accessories No.
3456
)
H
Thermal insulation for refrigerant piping
J
Refrigerant piping
7.2. Handling of ports that are not connected to out-
door unit (Fig. 7-5)
(1) In order to prevent refrigerant leaks, make sure that the
fl
are nuts are tightened
according to the speci
fi
ed torques* in Table 3.
* Refrigerant may also leak if the
fl
are nuts are tightened more than the speci-
fi
ed torques.
(2) In order to prevent condensation, install the pipe covers
7
8
against the unit
and fasten them with the supplied bands
9
.
Table 3
Diameters of branch box openings for
connecting indoor units (inch, mm)
Tightening torque
(ft•lbs, N•m)
1/4, ø6.35
8-11, 13 ± 2
3/8, ø9.52
21-24, 30 ± 2
1/2, ø12.7
35-38, 50 ± 2
►
Refrigerant charge:
Refer to the installation manual of the outdoor unit.
Use only R410A refrigerant (use of other refrigerants may cause troubles).
Fig. 7-4
Fig. 7-5
Fig. 7-6
Apply refrigerant oil
Fig. 7-3
9
9
8
7
(inch)
5 ft or less
Support
Pipe cover
Caution:
To avoid excessive strain on the branch box, support the piping with one or
more support(s) 1.5 m [5 ft] or less from the branch box.
Refer to Fig. 7-6 as an example.
J
Refrigerant piping
L
Thermal insulation for refrigerant piping
