Mitsubishi Electric PAC-MKA52BC Manuel D'installation page 8

7. Installing refrigerant piping
F
G
H
J
7 9
8
9
5 ft or less
L
en
7
Apply refrigerant oil
Fig. 7-3
5
6
Fig. 7-4
7/16 to 13/16
1-3/16 to 2
Fig. 7-5
Support
Pipe cover
J
Fig. 7-6
(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.
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
4
details.
3
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
and fasten them with the supplied bands
(inch)
Table 3
Diameters of branch box openings for
connecting indoor units (inch, mm)
► 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 [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
.
9
1/4, ø6.35
3/8, ø9.52
1/2, ø12.7
against the unit
7 8
Tightening torque
(ft•lbs, N•m)
8-11, 13 ± 2
21-24, 30 ± 2
35-38, 50 ± 2