INSTALLING THE INDOOR UNIT
Cutting/Extending the Piping
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
1Make sure that you have the required tools available (pipe cutter, reamer, flaring tool and pipe holder).
2If 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.
90O | Oblique | Rough | Burr |
O | x | x | x |
3 To prevent any gas from leaking out, remove all burrs at the cut end of the pipe, using a reamer.
4Slide 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˝) |
5Check 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.
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 ) |
7For further details on how to connect up to the outdoor unit and purge the circuit, refer to page 41.
