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Piping System
Piping Branch Restrictions
In the case that the piping length from the rst branch to the farthest indoor unit (L2) is over 131.2ft.(40m), follow the
instructions below when performing the eld-supplied piping work.
Example 1: Installation with Main Piping Branch
In the case that piping length from the rst branch to the terminal indoor units is within 131.2ft.(40m)-295.3ft.(90m).
(1) If the piping length L2 is over 131.2ft.(40m), the diameter of gas and liquid lines “b and c” or “g and h” should be
increased by one size with reducers (eld-supplied). If (a) is smaller than (b) after increasing the size, increase the size
of (a) to the same size as (b).
(2) The dierence between the piping length from the rst branch to the farthest indoor unit and the piping length from the
rst branch to the nearest indoor unit must be within 131.2ft.(40m).
Example 2: Installation without Main Piping Branch
In the case that piping length from the rst branch to the terminal Indoor Units is within 131.2ft.(40m)-295.3ft.(90m),
(1) If the piping length L2 is over 40m, the diameter size of gas and liquid lines “b, d and f” should be increased by one size
with reducers (eld-supplied). If (a) is smaller than (b) after increasing the size, increase the size of (a) to the same size
as (b).
(2) The dierence between the piping length from the rst branch to the farthest indoor unit and the piping length from the
rst branch to the nearest indoor unit must be within 131.2ft.(40m).
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