Design
D - 13
For
expansion
Outdoor unit
: Branch piping (separately sold item)
: Ball valve (BV sold separately)
Within 40cm
(from the
first branch)
Indoor unit for
future expansion
(7) Subsequent System Expansion
1Conditions for expanding indoor units
1) The maximum number of indoor units that can be connected to an outdoor unit is 24.
2) The range of indoor unit capacity that can be connected is 50-200% of the outdoor unit capacity.
2If there is a possibility of system expansion after installation, then install a ball valve (sold separately) on the branch piping of
the indoor unit side. (Figure 1)
1) In order to prevent oil from being drawn inside, reverse the slope on the pipe.
2) Place the ball valve as near as possible to the main piping (within 40cm).
3) If the diameter of the ball valve is smaller than the main piping, then reduce the diameter with a reducer. Only install the
reducer at this point.
4) Select a position where operations are easy, and where at a later date it is possible to confirm the installation location.
5) If the ball valve is installed on the indoor side (including the expansion of the indoor units) and in the main piping, then
it should be facing towards the indoor side.
3Select the piping size for the proposed expansion. [refer to (2) “Selecting branch piping sizes”]
Fig. 1
3. Refrigerant piping design
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