19
3
Refrigerant piping design
3-2.
Allowable length/height difference of refrigerant piping
Allowable length / height difference of refrigerant piping
*1 Furthest indoor unit from 1st branch to be named “A”.
Allowable
value (ft (m))
Pipes
Piping Length
Total extension of pipe (liquid pipe, real length)
591 (180)
L1 + L2 + L3 + a + b + c + d + e + f
Furthest piping length
L (*1)
Real length
328 (100)
L1 + L3 + f
Equivalent length
410 (125)
1
L
)
5
6
(
3
1
2
e
p
i
p
n
i
a
m
f
o
h
t
g
n
e
l
t
n
e
l
a
v
i
u
q
e
.
x
a
M
Max. equivalent length of furthest piping from
1st branching Li (*1)
f
+
3
L
)
5
3
(
5
1
1
Max. real length of indoor unit connecting pipe
49 (15)
a, b, c, d, e, f
Height
Difference
Height between indoor
and outdoor units H1
Upper outdoor unit
164 (50)
Lower outdoor unit
131 (40)
Height between indoor units H2
49 (15)
A
*1
Outdoor unit
Height difference
between indoor and
outdoor units
H1
Main
pipe
L1
1st branching
section
Branching pipe
L2
Branching
header
Indoor unit
Y-shaped
branching joint
Branching pipe
L3
Equivalent length corresponded to farthest piping
L
Equivalent length corresponded to farthest piping after 1st branching
Li
Height
difference
between indoor
units
H2
a
b
c d
e
f
E16-3P1_databook.book Page 19 Tuesday, December 20, 2016 3:02 PM
