12
Figure
3
‐
4.2:
Permitted
refrigerant
piping
lengths
and
level
differences
Table
3
‐
4.3:
Summary
of
permitted
refrigerant
piping
lengths
and
level
differences
Permitted
values
Piping
in
Figure
3
‐
4.2
Pipi
ng
leng
ths
Total
piping
length
1
≤
1000m
L
1
+
2
x
Ʃ
{L
2
to
L
12
}
+
Ʃ
{a
to
m}
Piping
between
farthest
indoor
unit
and
first
outdoor
branch
joint
2
Actual
length
≤
175m
L
1
+
Ʃ
{L
7
to
L
10
}
+
i
Equivalent
length
≤
200m
Piping
between
farthest
indoor
unit
and
first
indoor
branch
joint
3
≤
40m
/
90m
Ʃ
{L
7
to
L
10
}
+
i
Le
ve
l
di
ffe
re
nc
es
Largest
level
difference
between
indoor
unit
and
outdoor
unit
4
Outdoor
unit
is
above
≤
90m
Outdoor
unit
is
below
≤
110m
Largest
level
difference
between
indoor
units
5
≤
30m
Notes:
1.
Refer
to
Requirement
1,
above.
2.
Refer
to
Requirement
2,
above.
3.
Refer
to
Requirement
3,
above.
4.
Refer
to
Requirement
4,
above.
5.
Refer
to
Requirement
5,
above.
First
indoor
branch
joint
La
rg
es
t
le
vel
di
ffe
renc
e
be
tw
ee
n
in
door
uni
t
an
d
out
do
or
un
it
H
≤
90
m
La
rg
es
t
leve
l
di
ffer
enc
e
be
tw
een
in
door
uni
ts
H
≤
30m
Piping
between farthest
indoor
unit
and
first
indoor
branch
joint
L
≤
40m
Equivalent
length
of
piping
between farthest
indoor
unit
and
first
outdoor
branch
joint
L
≤
200m
N
1
(140)
N
4
(140)
N
7
(140)
N
8
(140)
N
10
(28)
N
12
(56)
N
11
(140)
N
3
(71)
N
6
(28)
N
13
(56)
A
B
G
H
K
I
L
C
E
L
1
L
2
L
3
L
5
L
7
L
8
L
11
L
12
L
9
a
c
d
f
g
h
j
l
m
k
M
N
g1
g2
g3
G
1
12HP
12HP
22HP
D
N
2
(140)
b
L
4
N
5
(140)
F
L
6
e
N
9
(71)
i
J
L
10
Legend
L
1
Main
pipe
Figures
in
parentheses
indicate
indoor
unit
capacity
indexes.
L
2
to
L
12
Indoor
main
pipes
a
to
m
Indoor
auxiliary
pipes
A
to
L
Indoor
branch
joints
M,
N
Outdoor
branch
joints
g1
to
g3,
G
1
Outdoor
connection
pipes
