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Refrigerant Piping
For T8P - E
Allowable length of refrigerant pipes and allowable height difference between units
Outdoor unit
A
Height
Header
difference
unit
between
outdoor
units
H3 ≤ 5 m
LA
Outdoor unit connection piping kit
(For linking of outdoor units)
The longest piping between outdoor units:
Height
LO ≤ 25 m
difference
between
outdoor
and indoor
units:
H1 ≤ 70 m
First branching
section
System restriction
O
u
d t
o
r o
u
n
t i
c
o
m
b
n i
t a
o i
n
T
o
a t
c l
a
p
a
c
y t i
f o
o
u
d t
o
r o
u
n
s t i
n I
d
o
r o
u
n
t i
c
o
n
n
e
t c
o i
n
Total capacity of indoor units
(varies depending on the height difference between
indoor units.)
Note
(*1):(D) is outdoor unit furthest from the 1st branch and (j) is the indoor unit furthest from the 1st branch.
(*2) :If the height difference (H1) between indoor and outdoor unit exceeds 3 m, set 65 m or less.
(*3) :If the max. combined outdoor unit capacity is 54HP or more, then max. equivalent length is 70 m or less (real length is 50 m or less).
(*4) :If the height difference (H2) between indoor units exceeds 3 m, set 50 m or less.
C
Follower unit
B
Follower
unit
Lc
Lb
La
Indoor unit connecting
pipe
Indoor unit
a
L3
The longest piping length: L ≤ 235 m
The longest piping length from the first branch: Li ≤ 90 m
Y-shaped
L4
branching joint
f
Indoor unit
H2 ≤ 15m
15m < H2
<Cooling,Heat pump type>
Branching header
Y-shaped branching
L7
joint
b
c
L6
L5
i
h
g
U
p
o t
3
u
n
s t i
U
p
o t
6
0
H
P
U
p
o t
6
4
u
n
s t i
135% of outdoor units' capacity
105% of outdoor units' capacity
d
e
Height
difference
between
indoor
j
units:
H2 ≤ 40 m
(j)
5
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