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7 .5 .
System piping (length) limitations
7 .5 .1 . Piping length restrictions
Make sure to perform the piping installation within the range of the
maximum allowable pipe length, allowable height difference and al
-
lowable length after branching as indicated below.
Definitions
Actual piping length: pipe length between outdoor
(1)
and indoor units.
Equivalent piping length: pipe length between outdoor
(1)
and indoor
units. (Assume equivalent piping length of refnet joint = 1.6 ft. (0.5 m)
and refnet header = 3.3 ft. (1 m) (for calculation purposes of equivalent
piping length, not for refrigerant charge calculations).)
Total piping length: total piping length from the outdoor
(1)
to all indoor
units.
(1) If the system capacity type is > 120, the distance will be
from the first outdoor unit branch to indoor units.
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