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English
7.5.2. System only containing VRV indoor units
System setup
Branch with REFNET joint
Branch with REFNET joint and
REFNET header
Branch with REFNET header
Single outdoor
a
A
h
i
j
k
l
m
n
B
C
D
E
F
G
p
b
c
d
e
f
1
2
3
4
5
6
7
8
g
H1
H2
Example 1.1
a
b
c
d
e
f
i
k
j
g
h
A
B
1
2
3
4
5
6
7
8
H1
H2
Example 1.2
a
c
b
d
e
f
i
g
h
1
2
3
4
5
6
7
8
H1
H2
Example 1.3
Multi outdoor
a
A
h
i
j
k
l
m
n
B
C
D
E
F
G
p
b
c
d
e
f
1
2
3
4
5
6
7
8
g
s
r
H1
H3
Example 2.1
j
k
b
1
2
3
4
5
6
7
8
c
d
e
f
g
h
s
r
B
A
H1
H3
H2
a
Example 2.2
a
b
1
2
3
4
5
6
7
8
c
d
e
f
g
h
i
s
r
H1
H3
Example 2.3
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
length
540 ft.
(165 m)
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 1.2
unit 6: a+b+h
≤
540 ft. (165 m)
unit 8: a+i+k
≤
540 ft. (165 m)
Example 1.3
unit 8: a+i
≤
540 ft. (165 m)
Equivalent length
623 ft. (2)
(190 m)
—
—
—
Total piping length
1640 ft.
(500 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)
Example 1.2
a+b+c+d+e+f+g+h+i+j+k
≤
1640 ft. (500 m)
Example 1.3
a+b+c+d+e+f+g+h+I
≤
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
length
33 ft. (10 m)
Example 3
r
≤
33 ft. (10 m)
s
≤
33 ft. (10 m)
Equivalent length
43 ft. (13 m)
—
Maximum allowable height difference
H1
≤
164 ft. (50 m ) (130 ft. (40 m)
(a)
(if outdoor is located below indoor units))
H2
≤
98 ft. (30 m)
H3
≤
16 ft. (5 m)
(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).
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