Specifications
Installation and operation manual
14
RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
9.5.2. System containing VRV DX indoor units
System setup
Example 3: with standard multi layout
Maximum allowable length
Between outdoor and indoor units
Between outdoor branch and outdoor unit (only in case >20 HP)
Maximum allowable height difference
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit
≤
40 m.
Example 1.1: unit 8: b+c+d+e+f+g+p≤40 m
Example 1.2: unit 6: b+h
≤
40 m, unit 8: i+k≤40 m
Example 1.3: unit 8: i≤40 m
However, extension is possible if all below conditions are met. In this
case limitation can be extended up to 90 m.
1 Outdoor units
2 Refnet joints (A~G)
3 Indoor unit (1~8)
a. The piping length between all indoor to the nearest branch kit is
≤40 m.
Example:
h, I, j … p≤40 m
b. It is necessary to increase the pipe size of the gas and liquid
piping if the pipe length between the first and the final branch kit
is over 40 m.
If the increased pipe size is larger than the pipe size of the main
pipe, then the pipe size of the main pipe has to be increased as
well.
Branch with refnet joint
Branch with refnet joint and refnet
header
Branch with refnet header
Single outdoor
Example 1.1
Example 1.2 Example 1.3
Multi outdoor
Example 2.1
Indoor unit
Refnet joint
Refnet header
Outdoor multi
connection piping
kit
Actual piping length 120 m Example 1.1
unit 8: a+b+c+d+e+f+g+p≤120 m
Example 2.1
unit 8: a+b+c+d+e+f+g+p≤120 m
Example 1.2
unit 6: a+b+h≤120 m
unit 8: a+i+k≤120 m
Example 1.3
unit 8: a+i≤120 m
Equivalent length
(2)
150 m ———
Total piping length 300 m Example 1.1
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p
≤
300 m
Example 2.1
a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤300 m
——
a
A
hijklmn
BC D E FG
p
bcdef
1234567
8
g
H1
H2
a
b
cde f
i
k
j
gh
AB
123456
78
H1
H2
a
c
b de f
i
gh
1234567
8
H1
H2
a
A
hijklmn
BC D E FG
p
bcdef
12 3 456 7
8
g
t
u
r
s
H1
H3
a
jk
b
123456
78
cde f gh
t
u
r
s
BA
H1
H3
H2
a
b
1234567
8
cde f gh i
t
u
r
s
H1
H3
r s
u
t
Actual piping length 10 m Example 3
r, s, t≤10 m; u≤5m
Equivalent length 13 m —
H1
≤
50 m (40 m)
(if outdoor is located below indoor units)
H2
≤
15 m
H3
≤
5m
a
A
hijklmn
BC D E FG
p
bcdef
12 3456 7
8
g
H1
H2
1
2
3