24
Header branching
* When total capacity of connected indoor unit exceeds 130% of rated capacity, restrict the permissible piping
length (actual length) to 328ft.
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) as illustrated.
Permissible
piping
length
Maximum piping length (L)
(Equivalent length/Actual length)
f
+
A
Maximum piping length after the first branch ( )
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 header piping kit
• Connect crimp piping (locally required) to the branching points (on the indoor unit connection side) in
accordance with the number of connected indoor units.
• Refer to the header branching kit (sold separately) for the crimp piping size.
Total capacity of down-
stream indoor units (Btu/h)
Header kit type
Number of branches
less than 76.000
76.000 or more
and less than 112.000
KHRP26M33H
KHRP26M22H
KHRP26M73H
Up to 8 branches
Up to 4 branches
112.000 or more
and less than 234.000
KHRP26M72H
234.000 or more
Important reminder:
• Be sure to use the header branching and indoor unit piping that correspond to the indoor unit connecting
piping size.
• Always install the header branching joint (both vapor and liquid sides) so that the joint branches
horizontally. (Refer to “4-5. Notes for branch piping” on page 30).
•
Re-branching after the header branching is not allowed. Besides, the indoor unit with capacity of
96.000 Btu/h or larger can not be connected after the header branching.
32’ 10”
(10 m)
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)