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7.5.2. System only containing VRV indoor units
System setup
Branch with REFNET joint
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.
Example 3: with standard multi layout
r
s
Maximum allowable length
• Between outdoor and indoor units (standard multi/free multi combinations).
Actual piping
540 ft.
(165 m)
length
Equivalent length
623 ft. (2)
(190 m)
Total piping length 1640 ft.
(500 m)
(2) See [7.3.3]= on page 10.
• Between outdoor branch and outdoor unit
(in case of multi outdoor units).
(only in case ≥144 type)
Actual piping
33 ft. (10 m) Example 3
length
Equivalent length
43 ft. (13 m)
English
a
b
c
d
e
f
g
H1
A
B
C
D
E
F
G
p
h
i
j
k
l
m
n
1
2
3
4
5
6
7
8
H2
Example 1.1
H3
r
s
a
b
c
d
e
f
g
H1
A
B
C
D
E
F
G
p
h
i
j
k
l
m
n
1
2
3
4
5
6
7
8
Example 2.1
Example 1.1
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)
—
Example 1.1
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤1640 ft. (500 m)
Example 2.1
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤1640 ft. (500 m)
r≤33 ft. (10 m)
s≤33 ft. (10 m)
—
Branch with REFNET joint and
REFNET header
i
a
A
B
k
b
j
H1
7
8
H2
c
d
e
f
g
h
1
2
3
4
5
6
Example 1.2
H3
s
r
a
H1
A
B
b
j
k
7
8
H2
c
d
e
f
g
h
1
2
3
4
5
6
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
≤1640 ft. (500 m)
Maximum allowable height difference
≤164 ft. (50 m ) (130 ft. (40 m)
H1
(a)
(if outdoor is located below indoor units))
≤98 ft. (30 m)
H2
≤16 ft. (5 m)
H3
(a)
Conditional extension up till 295 ft. (90 m) is possible without additional option
kit:
In case the outdoor location is higher than indoor: extension is possible up till
295 ft. (90 m) and following 2 conditions must be fulfilled:
• Liquid piping size up (see table Size up for equivalent length for outdoor-
indoor units over 295 ft. (90 m) on page 11).
• Dedicated setting on outdoor unit is required (see [2-49]= on page 33).
In case the outdoor location is lower than indoor: extension is possible up till
295 ft. (90 m) and following 6 conditions must be fulfilled:
• Liquid piping size up (see table Size up for equivalent length for outdoor-
indoor units over 295 ft. (90 m) on page 11).
• Dedicated setting on outdoor unit is required (see [2-35]= on page 33).
Branch with REFNET header
a
H1
b
c
d
e
f
g
h
i
1
2
3
4
5
6
7
8
H2
Example 1.3
H3
r
s
a
H1
b
c
d
e
f
g
h
i
1
2
3
4
5
6
7
8
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
≤1640 ft. (500 m)
12
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