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Allowable length of refrigerant pipes and allowable height
difference between units
Height
difference
Header
unit
between
outdoor
units
H3
≤ 5 m
Outdoor
(a)
Height
difference
between
outdoor
and indoor
Equivalent length corresponded to farthest piping
Main
units:
between outdoor unit
H1
piping
≤ (70 m)
L1
1st branching
section
L3
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 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.)
Appendex- 1
A
B
C
Follower
Follower
Follower
(b)
(c)
(d)
LO
< 40 m
Y-shape branching
joint for gas pipe
Branching piping
Connecting piping of indoor unit
a
Equivalent length corresponded to farthest piping
Equivalent length corresponded to farthest piping after 1st branching
L4
Y-joint
f
n
s t i
E
Follower
unit
(e)
D
Y-shape branching
joint for liquid pipe
Branching
header
L2
L7
b
c
Indoor unit
L5
L6
g
h
Indoor unit
Single
H2 ≤ 15 m
Combination
H2 > 15 m
1
Figure 1
C
r o
e r
t c
Header unit
Follower unit
A
B
Main pipe
To the indoor unit
Figure 2
n I
c
r o
e r
t c
Header unit
Follower unit
A
B
Incorrect
Main pipe
To the indoor unit
Y-joint
d
e
L
≤ 250 m
Li
≤ 90 m
i
j
(j)
U
p
o t
5
u
n
s t i
U
p
o t
1
2
0
H
P
U
p
o t
1
2
8
u
n
s t i
200% of outdoor units' capacity
150% of outdoor units' capacity
105% of outdoor units' capacity
Follower unit
C
Follower unit
C
Height
difference
between
indoor
units:
H2
≤ 40 m
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