Aisin AXGP224E1, Technical Manual

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16
Selecting branch piping and permissible piping length
Line branching
Layout example
(When 6 indoor units are connected)
Note: If there is a height differen-
ce between the locations of
indoor and outdoor units, apply
a small “trap pipes” only on the
vapor line at least every 10 m as
illustrated.
10 m 10 m
Permissible
piping length
Maximum piping length (L)*
(
Equivalent length / Actual length)
A + B + C + D + E + f 190/165m or less
Maximum piping length after the first branch
B + C + D + E + f
60 m or less
Piping length difference after the first branch
(when A is shortest length after the first branch)
l
– a 40 m or less
Permissible
height
difference
Height difference between indoor and
outdoor unit (H)
When outdoor unit is higher than
indoor unit
50 m or less
When outdoor unit is lower than
indoor unit
40 m or less
Height difference between indoor units (h) 15 m or less
Br
a
n
c
h
p
ip
in
g
How to select the branch piping kit
* When total capacity of connected indoor unit exceeds 130% of rated capacity, restrict the permissible piping
length (actual length) to 100 m.
CAUTION
In the case of header branching or line-header combined branching, indoor units with capacity of
P280 or larger cannot be connected after the header branching (c, d, e or f in the right figure).
Connect the indoor units with capacity of P280 or larger to line branching (a or b in the right figure).
Important remider
Be sure to use the indoor unit piping and indoor branch piping that correspond to the indoor unit connecting piping
size.
Always install the branch piping joint (both for vapor and liquid) so that the joint branches either horizontally or
vertically.
Refer to the following table to select the branch piping kit because the size of branching pipe varies
depending on the total capacity of connected indoor units (total capacity of the downstream indoor
units).