7. Installing refrigerant piping
3
6
4
5
(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, fit 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 flare 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 flare nuts are tightened
according to the specified torques* in Table 3.
* Refrigerant may also leak if the flare nuts are tightened more than the speci
-
fied 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
Fig. 7-3
(inch)
L
J
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
Apply refrigerant oil
9
9
8
7
7/16 to 13/16
1-3/16 to 2
en
7
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