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36
INSTALLING THE INDOOR UNIT
Five metres(16ft 5in) of piping is supplied with the air
conditioner(Optional). This length can if necessary be:
◆ Extended to a maximum of “L” m/ft.
◆ Shortened as required
☛ If more than 5m(16ft 5in) of piping is required:
◆ The assembly cable must also be extended
◆ Refrigerant must be added to the circuit by an
approved installer; otherwise, the indoor unit may
freeze
1 Make sure that you have the required tools available
(pipe cutter, reamer, flaring tool and pipe holder).
2 If you wish to shorten the piping, cut it using a pipe cutter, taking care to
ensure that the cut edge remains at a 90° angle with the side of the pipe,
and referring to the illustrations below for examples of edges cut correctly
and incorrectly.
Oblique Rough Burr
3 To prevent any gas from leaking out, remove all burrs at the cut end of the
pipe, using a reamer.
4 Slide a flare nut on to the pipe and modify the flare.
Pipe Outer Diameter (D) Depth (A)
Liquid refrigerant 6.35 mm
(1/4˝)
1.3 mm
(1/16˝)
Gas refrigerant 9.52 mm
(3/8˝)
1.8 mm
(1/16˝)
Gas refrigerant 12.70 mm
(1/2˝)
2.0 mm
(1/16˝)
Gas refrigerant 15.88 mm
(5/8˝)
2.2 mm
(1/8˝)
5 Check that the flaring is correct, referring to the illustrations below for
examples of incorrect flaring.
Inclined Damaged Surface Cracked Uneven Thickness
6 Align the pipes to be connected and tighten the flare nuts first manually
and then with a wrench, applying the following torque.
7 For further details on how to connect up to the outdoor unit and purge the
circuit, refer to page 41.
90
O
Ox x x
Cutting/Extending the Piping
Pipe Outer Diameter Torque
Liquid refrigerant 6.35 mm(1/4˝) 160kg•cm(11.6ft•lb )
Gas refrigerant 9.52 mm(3/8˝) 300kg•cm(21.8ft•lb )
Gas refrigerant 12.70 mm(1/2˝) 500kg•cm(36.4ft•lb )
Gas refrigerant 15.88 mm(5/8˝) 700kg•cm(50.6ft•lb )