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Installation Manual
7.5.2. System only containing VRV indoor units
System setup
Single outdoor
Multi outdoor
Indoor unit
Refnet joint
Refnet header
Outdoor multi con-
nection piping kit
Difference in height between outdoor and indoor units: H1.
Difference in height between indoor and indoor units: H2.
Difference in height between outdoor and outdoor units: H3.
Difference in height between outdoor and BP unit: H4.
Difference in height between BP unit and BP unit: H5.
Difference in height between BP unit and Mini-split indoor unit: H6.
Example 3: with standard multi layout
r
Maximum allowable length
Between outdoor and indoor units (standard multi/free multi combinations)
Actual piping
length
Equivalent length
Total piping length 3280 ft.
Between outdoor branch and outdoor unit
Actual piping
length
Equivalent length
3P362438-1B English
22
Branch with refnet joint
a
b
c
d
e
f
A
B
C
D
E
F
h
i
j
k
l
1
2
3
4
5
Example 1.1
H3
r
s
t
u
a
b
c
d
e
A
B
C
D
E
h
i
j
k
l
1
2
3
4
5
Example 2.1
s
t
540 ft.
Example 1.1
(165 m)
unit 8: a+b+c+d+e+f+g+p 540 ft. (165 m)
Example 2.1
unit 8: a+b+c+d+e+f+g+p 540 ft. (165 m)
(2)
623 ft.
—
(190 m)
Example 1.1
(1000 m)
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p 3280 ft. (1000 m)
Example 2.1
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p 3280 ft. (1000 m)
33 ft. (10 m) Example 3
r 33 ft. (10 m)
s 33 ft. (10 m)
t 33 ft. (10 m)
—
43 ft. (13 m)
Branch with refnet joint and refnet header
a
A
g
b
H1
H1
G
p
m
n
c
d
e
6
7
1
2
3
8
H2
Example 1.2
H3
t
r
s
u
a
f
g
H1
A
b
F
G
p
m
n
6
7
c
d
e
f
8
1
2
3
4
Example 2.2
Example 1.2
unit 6: a+b+h 540 ft. (165 m)
unit 8: a+i+k 540 ft. (165 m)
—
Example 1.2
a+b+c+d+e+f+g+h+i+j+k
3280 ft. (1000 m)
Maximum allowable height difference
H1
164 ft. (50 m ) (130 ft. (40 m)
H2
98 ft. (30 m)
H3
16 ft. (5 m)
(a)
kit:
Liquid piping size up (see table Size up for equivalent length for outdoor-
130-197 ft. (40-60 m): minimum connection ratio connected: 80%.
197-213 ft. (60-65 m): minimum connection ratio connected: 90%.
213-262 ft. (65-80 m): minimum connection ratio connected: 100%.
262-295 ft. (80-90 m): minimum connection ratio connected: 110%.
Liquid piping size up (see table Size up for equivalent length for outdoor-indoor
Branch with refnet header
i
a
B
k
j
7
8
H2
b
c
d
e
f
f
g
h
1
2
3
4
5
4
5
6
Example 1.3
t
r
s
u
H1
a
B
j
k
7
8
H2
g
h
b
c
d
e
5
6
1
2
3
4
5
Example 2.3
Example 1.3
unit 8: a+i 540 ft. (165 m)
—
Example 1.3
a+b+c+d+e+f+g+h+I
3280 ft. (1000 m)
(a)
(if outdoor is located below indoor units))
Installation of Outdoor Units
EDUS341411-N
H1
g
h
i
6
7
8
H2
H3
H1
f
g
h
i
6
7
8
12
3P362438-1B
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