Main Unit and Piping
Electrical
Test Operation
Reference
23
4. Refrigerant Piping
197 ft (60 m or less)
623/541 ft (190/165 m or less)
131 ft (40 m or less)
131 ft (40 m or less)
49 ft (15 m or less)
164 ft (50 m or less)
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Selecting branch piping and permissible piping length
Line branching
* When total capacity of connected indoor unit exceeds 130% of rated capacity, restrict the permissible piping
length (actual length) to 328ft.
Important Reminder
�
In the case of header branching or line-header
combined branching, indoor units with capacity of
96.000 Btu/h 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 96.000 Btu/h or
larger to line branching (a or b in the right figure).
Layout example
(When 6 indoor units are
connected)
Note: If there is a height differ-
ence between the loca-
tions of indoor and
outdoor units, apply a
small “trap pipes” only
on the vapor line at least
every 32’ 10” (10 m) m as illustrated.
Permissible
piping
length
Maximum piping length (L)
(Equivalent length/ Actual length)
f
+
E
+
D
+
C
+
B
+
A
Maximum piping length after the first branch ( )
B + C + D + E + f
Piping length difference after the first branch
(when “a” is the shortest length after the first
branch)
- a
Permissible
height
difference
Height difference between indoor unit and out-
door unit (H)
When outdoor unit is higher than indoor unit
When outdoor unit is lower than indoor unit
Height difference between indoor units (h)
Branch
piping
How to select the branch piping kit
• 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).
Classification
Branch piping kit type
First branch for outdoor
unit capacity (ton)
15 ton
Second branch and
after for downstream
indoor unit total capacity
(Btu/h)
less than 76.000
76.000 or more
and less than 112.000
KHRP26A33T
112.000 or more and
and less than 234.000
KHRP26A72T
KHRP26A72T
KHRP26A73T
KHRP26A22T
KHRP26A73T
234.000 or more
Important reminder:
• 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 “4-5. Notes for branch piping” on page 30).
32’ 10”
(10 m)
Summary of Contents for AWGP180E1NHS
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