INSTALLING THE INDOOR UNIT
Cutting/Extending the Piping
5 metres(16ft. 5in) of piping is supplied with the air conditioner(Optional). This length can if necessary be:
◆Extended to a maximum of 20m (65ft. 7in).
◆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).
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 | 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 | 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 43.
