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Allowable length of refrigerant pipes and allowable height
difference between units
Height
A
B
C
D
difference
Header
Follower
Follower
Follower
between
unit
outdoor
units
H3
5 m
Outdoor
(a)
(b)
(c)
(d)
Height
difference
between
outdoor
and indoor
Equivalent length corresponded to farthest piping
Main
LO
units:
between outdoor unit
< 40 m
H1
(70 m)
piping
L1
Y-shape branching
Y-shape branching
joint for gas pipe
joint for liquid pipe
L2
Branching piping
Connecting piping of indoor unit
1st branching
section
a
L3
Equivalent length corresponded to farthest piping
Equivalent length corresponded to farthest piping after 1st branching
L4
Y-joint
f
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
H2
(varies depending on the height difference between
indoor units.)
E
Follower
unit
(e)
Branching
header
L7
Y-joint
b
c
d
e
Indoor unit
L
250 m
Li
90 m
L5
L6
g
h
i
j
(j)
Indoor unit
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
Single
200% of outdoor units' capacity
15 m
Combination
150% of outdoor units' capacity
H2 > 15 m
105% of outdoor units' capacity
Cautions for installation
Set the outdoor unit first connected to the bridging pipe to the indoor units as the header unit.
Install the outdoor units in order of their capacity codes: A (header unit)
When connecting gas pipes to indoor units, use Y-shaped branching joints to keep pipes level.
When piping to outdoor units using Outdoor unit connection piping kits, intersect the pipes to the outdoor unit
and those to indoor units at a right angle as shown in figure 1 on "6. Installation of the outdoor unit".
Do not connect them as in figure 2 on "6. Installation of the outdoor unit".
Allowable length and allowable height difference of refrigerant piping
Item
Total extension of pipe (Liquid
pipe, real length)
Farthest piping Length L (*1)
Max. equivalent length of main
Piping length
piping
Equivalent length of farthest piping from 1st
branching Li (*1)
Equivalent length of farthest piping between
outdoor units LO
Max. equivalent length of outdoor unit connecting
piping
Max. real length of indoor unit connecting piping
Max. equivalent length between branches
Height between indoor and
outdoor units H1
Difference in
height
Height between indoor units H2
Height
difference
Height between outdoor units H3
between
*1: (E) is outdoor unit furthest from the 1st branch and (j) is the indoor unit furthest from the 1st branch.
indoor
*2: If the height difference between indoor and outdoor unit (H1) exceeds 3 m, the piping length is 65 m or less.
units:
H2
*3: If the max. combined outdoor unit capacity is 54 HP or more, then max. equivalent length is 70 m or less (real length is
40 m
50 m or less).
*4: If the height difference between indoor units (H2) exceeds 3 m, the difference in height is 30 m or less.
*5: Total charging refrigerant is 140 kg or less.
*6: Extension up to 110 m is possible with conditions below :
fference between indoor units (H2) is 3 m or less.
*7: Extension up to 110 m is possible with conditions below :
fference between indoor units (H2) is 3 m or less.
*8: If the connected ratio of indoor units to outdoor unit is more than 105%, set 15 m or less.
– 18 –
B
C
D
E
Allowable
Piping section
value
Single outdoor
500 m
unit system
LA + LB + LC + La + Lb + Lc + Ld + Le +
L1 + L2 + L3 + L4 + L5 + L6 + L7 + a + b
Multiple
+ c + d + e + f + g + h + i + j
outdoor unit
1200 m (*6)
system
Equivalent
250 m
LA + LB + LC + Le + L1 + L3 + L4 + L5
length
+ L6 + j
Real length
210 m
Equivalent
120 m (*3)
length
L1
Real length
100 m (*3)
90 m (*2)
L3 + L4 + L5 + L6 + j
40 m
LA + LB + LC + Le (LA + LB + LC + Ld)
10 m
La, Lb, Lc, Ld, Le
30 m
a, b, c, d, e, f, g, h, i, j
50 m
L2, L3, L4, L5, L6, L7
Upper
70 m
–
outdoor unit
(*6)
Lower
40 m
–
outdoor unit
(*4, *7)
40 m (*8)
–
5
m
–
EN
EN
EN
ID
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