Hisense AVWT-76FKFSHA Technical Handbook page 35

1.When the liquid piping length is longer than 15m, use Φ9.53 pipe and reducer (field-supplied) instead of Φ6.35 pipe.
2.The pipe diameter should be the same as the indoor unit piping connection size.
Piping Branch Restrictions
In the case that the piping length from the first branch to the farthest indoor unit (L2) is over 40m, follow the
instructions below when performing the field-supplied piping work.
Example 1: Installation with Main Piping Branch
In the case that piping length from the first branch to the terminal Indoor Units is within 40-90m.
(1) If the piping length L2 is over 40m, the diameter of gas and liquid lines "b and c" or "g and h" should be
increased by one size with reducers (field-supplied).
(2) The difference between the piping length from the first branch to the farthest indoor unit and the piping
length from the first branch to the nearest indoor unit must be within 40m.
Example 2: Installation without Main Piping Branch
In the case that piping length from the first branch to the terminal indoor
units is within 40-90m,
(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 (field-supplied). If (a) is smaller than (b) after increasing the size, increase
the size of (a) to the same size as (b).
(2) The difference between the piping length from the first branch to the farthest indoor unit and the piping
length from the first branch to the nearest indoor unit must be within 40m.
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