8
7. Installing refrigerant piping
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.
() 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 (mm)
Tightening torque
(N•m)
ø6.35
13 ±
ø9.5
30 ±
ø1.7
50 ±
► Refrigerant charge:
Refer to the installation manual of the outdoor unit.
Use only R410A refrigerant (use of other refrigerants may cause troubles).
Caution:
To avoid excessive strain on the branch box, support the piping with one or
more support(s) 1.5 m or less from the branch box.
Refer to Fig. 7-6 as an example.
J
Refrigerant piping
L
Thermal insulation for refrigerant piping
(mm)
Fig. 7-4
C
D
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 10 - 0 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
.
L
J
1.5m or less
Support
Pipe cover
Fig. 7-5
Fig. 7-6
Apply refrigerant oil
Fig. 7-3
9
9
8
7
10 to 20
30 to 50
