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Installation and operation manual
15
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
c.
When the piping size is increased (step b), the piping length has
to be counted as double (except for the main pipe and the pipes
that are not increased in pipe size).
The total piping length has to be within limitations (see table
above).
Example:
a+b*2+c*2+d*2+e*2+f*2+g*2+h+i+j+k+l+m+n+p
≤
1000 m
(500 m).
d.
The piping length difference between the nearest indoor from
first branch to the outdoor unit and farthest indoor to the outdoor
unit is
≤
40 m.
Example: The farthest indoor unit 8. The nearest indoor unit 1
→
(a+b+c+d+e+f+g+p)–(a+h)
≤
40 m.
9.5.3.
System containing VRV DX indoor units and Hydrobox
System setup
Example 1: Branch with refnet joint.
Example 2: Branch with refnet joint and refnet header.
Example 3: Branch with refnet header
1~7
VRV DX indoor units
8
Hydrobox unit (HXY*)
Maximum allowable length
Between outdoor and indoor units.
Maximum allowable height difference (on Hydrobox indoor unit)
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit
≤
40 m.
Example 1: unit 8: b+c+d+e+f+g+p
≤
40 m
Example 2: unit 6: b+h
≤
40 m, unit 8: i+k
≤
40 m
Example 3: unit 8: i
≤
40 m, unit 2: c
≤
40 m
9.5.4.
System containing VRV DX indoor units and RA DX
indoor units
System setup
Header
BP box
1~5
RA DX indoor units
6,7
VRV DX indoor units
Maximum allowable length
Between outdoor unit and indoor unit.
Between BP unit and indoor unit.
Remark:
Minimum allowable length
between outdoor unit and first
refrigerant branch kit>5 m (the refrigerant noise from the outdoor unit
can be transmitted).
Example: a>5 m
Maximum allowable height difference
Maximum allowable length after branch
The pipe length from the first refrigerant branch kit to the indoor unit
≤
50 m.
Example: b+g+l
≤
50 m
If the piping length between the first branch and BP unit or VRV DX
indoor unit is over 20 m, it is necessary to increase the gas and liquid
piping size between the first branch and BP unit or VRV DX indoor
unit. If the piping diameter of the sized up piping exceeds the
diameter of the piping before the first branch kit, than the latter also
requires a liquid piping and gas piping size up.
Actual piping length
135 m
Example 1:
a+b+c+d+e+f+g+p
≤
135 m
a+b+c+d+k
≤
135 m
Example 2:
a+i+k
≤
135 m
a+b+e
≤
135 m
Example 3:
a+i
≤
135 m
a+d
≤
135 m
Equivalent length
(a)
(a) Assume equivalent piping length of refnet joint=0.5 m and refnet header=1 m (for
calculation purposes).
160 m
—
Total piping length
300 m
Example 3:
a+b+c+d+e+f+g+h+i
≤
300 m
H1
≤
50 m (40 m) (if outdoor is located below indoor units)
H2
≤
15 m
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
a
b
c
d
e
f
i
k
j
g
h
A
B
1
2
3
4
5
6
7
8
H1
H2
a
c
b
d
e
f
i
g
h
1
2
3
4
5
6
7
8
H1
H2
Actual piping length
100 m
Example:
a+b+g+l
≤
100 m
Equivalent length
(a)
(a) Assume equivalent piping length of refnet joint=0.5 m and refnet header=1 m (for
calculation purposes).
120 m
—
Total piping length
250 m
Example:
a+b+d+g+l+k+c+e+f+h+i+j
≤
250 m
Indoor unit capacity index
Pipe length
<60
2~15 m
60
2~12 m
71
2~8 m
H1
≤
50 m (40 m) (if outdoor is located below indoor units)
H2
≤
15 m
H4
≤
40 m
H5
≤
15 m
H6
≤
5 m
NOTICE
There are restrictions on the refrigerant pipe connection
order between outdoor units during installation in case of a
multiple outdoor unit system. Install according to following
restrictions. The capacities of outdoor units A, B and C
must fulfill the following restriction conditions: A
≥
B
≥
C.
H5
H4
a
c
f
e
h
H1
BP1
6
i
j
g
b
d
A
B
7
k
l
BP2
5
4
3
2
1
H2
H6
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