7
NOTE
•
Install the BS unit according to the instructions shown on the label attached to the electric parts box.
•
Clamp securely so the internal wiring does not touch the screws or sheet metal due to looseness.
6. REFRIGERANT PIPING WORK
• This section describes how to connect the piping to the BS unit. Select the piping size based on the
procedure outlined here.
• Regarding piping work between the outdoor unit and the BS unit, selection of the branch kit, and
the piping work between the branch kit and the indoor unit, see the installation manual for the out-
door unit and other technical documents.
• Always check that the refrigerant to be used is R410A before starting work. (If the wrong refrigerant
is used, the unit will not operate normally.)
• Completely insulate the discharge and suction piping both liquid and gas. Not insulating them may
cause leaking or burns. Only use insulating material which is resistant to 250°F or higher. If you
think the humidity in the ceiling might exceed 86°F and RH80%, reinforce the insulation on the cool-
ing piping (at least 13/16’’ thick). Condensation might form on the surface of the insulation.
