•
Outdoor Unit • VRV Classic • RXYCQ-A
1
13
•
VRV Systems • Outdoor Unit
66
13
Installation
13 - 3
Refrigerant Pipe Selection
6R54974:/3*3+
TZ[ES/C
Example of connection
(Connection of 8 indoor units Heat pump system)
Branch with refnet joint
Branch with refnet joint and refnet header
Branch with refnet header
One outdoor unit
installed
Maximum allowable length
Between outdoor and indoor units
Actual pipe length
Pipe length between outdoor(*) and indoor units
)
135 m
[Example] unit 8: a+b+c+d+e+f+g+p
)
135 m
[Example] unit 6: a+b+h
)
135 m, unit 8: a+i+k
)
135 m
[Example] unit 8: a+i
)
135 m
Equivalent length
Equivalent pipe length between outdoor(*) and indoor units
)
155 m (Assume equivalent pipe length of refnet joint to be 0.5 m and of the refnet header to be 1.0 m.
(for
calculation purposes))
Total extension
length
Total piping length from outdoor unit to all indoor units
)
300 m
Allowable height
Between outdoor and indoor units
Difference in
height
Difference in height between outdoor and indoor units (H1)
)
30 m
Between indoor and indoor units
Difference in
height
Difference in height between adjacent indoor units (H2)
)
15 m
Allowable length after the branch
Actual pipe length
Pipe length from first refrigerant branch kit (either refnet joint or refnet header) to indoor unit
)
40 m (See note 1 on next page)
[Example] unit 8: b+c+d+e+f+g+p
)
40 m
[Example] unit 6: b+h
)
40 m, unit 8: i+k
)
40 m
[Example] unit 8: i
)
40 m
Refrigerant branch kit selection
Refrigerant branch kits can only be used with R410A.
How to select the refnet joint
•
When using refnet joints at the first branch counted from the outdoor unit side.
Choose from the following table in accordance with the capacity of the outdoor unit.
•
For refnet joints other than the first branch, select the proper branch kit model based on
the total capacity index.
How to select the refnet header
•
Choose from the following table in accordance with the total capacity of all the indoor
units connected below the refnet header.
•
Note: 250 type cannot be connected below the refnet header.
Example of downstream indoor units
[Example]
in case of refnet joint C; indoor units 3+4+5+6+7+8
[Example]
in case of refnet joint B; indoor units 7+8,
in case of refnet header; indoor units 1+2+3+4+5+6
[Example]
in case of refnet header;
indoor units 1+2+3+4+5+6+7+8
indoor unit
refnet joint
refnet header
a
b
c
d
e
f
g
H1
p
A
B
C
D
E
F
G
1
2
3
4
5
6
7
8
H2
h
i
j
k
l
m
n
H1
H2
a
i
b
c
d
e
f
g
h
k
j
7
8
A
B
1
2
3
4
5
6
a
H1
H2
c
d
e
f
g
h
i
b
1
2
3
4
5
6
7
8
Outdoor unit capacity type
Refrigerant branch kit name
RXYCQ8
KHRQ22M20T
RXYCQ10~12
KHRQ22M29T9
RXYCQ14~20
KHRQ22M64T
Indoor capacity type
Refrigerant branch kit name
<200
KHRQ22M20T
200
)
x<290
KHRQ22M29T9
290
)
x<600
KHRQ22M64T
Indoor capacity type
Refrigerant branch kit name
<290
KHRQ22M29H (Max.
8 branch)
290
)
x<600
KHRQ22M64H (Max.
8 branch)
TZ[ES/C
Pipe size selection
A.
Piping between outdoor unit and refrigerant branch kit
•
Choose from the following table in accordance with the outdoor unit total
capacity type, connected downstream.
Outdoor unit connection piping size
B.
Piping between refrigerant branch kits
•
Choose from the following table in accordance with the total capacity of
all the indoor units connected below this.
•
Do not let the connection piping exceed the refrigerant piping size
chosen by general system model name.
C.
Piping between refrigerant branch kit and indoor unit
•
Pipe size for direct connection to indoor unit must be the same as the
connection size of indoor unit.
When the equivalent pipe length between outdoor and indoor units is 90 m or more, the size of the main pipes (both gas side and liquid side) must be increased.
Depending on the length of the piping, the capacity may drop, but even in such a case it is possible to increase the size of the main pipes.
How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged R (kg)
R should be rounded off in units of 0.1 kg
Example for refrigerant branch using refnet joint
If the outdoor unit is RXYCQ20A and the piping lengths are as below
A
B
C
Outdoor unit
capacity type
Piping size (outer diameter) (mm)
Gas pipe
Liquid pipe
RXYCQ8
Ø15.9
Ø9.5
RXYCQ10
Ø19.1
RXYCQ12
Ø22.2
RXYCQ14~18
Ø28.6
Ø12.7
RXYCQ20
Ø15.9
Indoor or outdoor unit
total capacity
Piping size (outer diameter) (mm)
Gas pipe
Liquid pipe
<150
Ø15.9
Ø9.5
150
)
x<200
Ø19.1
200
)
x<290
Ø22.2
290
)
x<420
Ø28.6
Ø12.7
420
)
x<600
Ø15.9
Indoor capacity type
Piping size (outer diameter) (mm)
Gas pipe
Liquid pipe
20~50
Ø12.7
Ø6.4
63~125
Ø15.9
Ø9.5
200
Ø19.1
250
Ø22.2
Gas side
Liquid side
RXYCQ8
Ø15.9
Þ
Ø19.1
RXYQ8
Ø9.5
—
RXYCQ10
Ø19.1
Þ
Ø22.2
RXYQ10~12
Ø9.5
Þ
Ø12.7
RXYCQ12
Ø22.2
Þ
Ø25.4
(a)
(a)
If not available, increase is not allowed
RXYQ14~18
Ø12.7
Þ
Ø15.9
RXYCQ14+16
Ø28.6
—
RXYQ20
Ø15.9
Þ
Ø19.1
RXYCQ18+20
Ø28.6
Þ
Ø31.8(a)
— Increase is not allowed
— Increase is not allowed
1
Outdoor unit
4
First refrigerant branch
kit
2
Main pipes
3
Increase
5
Indoor unit
1
5
2
4
3
X
1...5
= Total length (m) of liquid piping size at
Øa
A
= Weight according to table
When using metric piping, see note 2.
a : Ø15.9x30 m
b : Ø15.9x5 m
c : Ø15.9x5 m
e : Ø12.7x5 m
f : Ø12.7x5 m
g : Ø9.5x5 m
i : Ø6.4x3 m
j : Ø9.5x3 m
m: Ø9.5x3 m
n : Ø9.5x3 m
k : Ø6.4x3 m
R
= [40x0.18]+[15x0.12]+[17x0.059]+[12x0.022] = 10.27
Þ
R = 10.3 kg
d : Ø12.7x5 m
h : Ø6.4x3 m
p : Ø9.5x3 m
l : Ø6.4x3 m
Note 1
Allowable length after the first refrigerant branch kit to indoor units is 40 m or less, however it can be extended up to 90 m if all the following conditions are fulfilled.
Required conditions
Example drawings
It is necessary to increase the pipe size of the liquid and the gas pipe if the pipe length between the first
and the final branch kit is over 40 m (reducers must be procured on site).
If the increased pipe size is larger than the pipe size of the main pipe, then the pipe size of the main pipe
needs to be increased as well.
indoor unit
8
:
b+c+d+e+f+g+p
)
90 m
increase the pipe size
of b, c, d, e, f, g
Increase the pipe size as follows
* If available on the site.
Otherwise it can not be increased.
For calculation of total extension length, the actual length of above pipes must be doubled.
(except main
pipe and the pipes that not increase the pipe size)
a+b*2+c*2+d*2+e*2+f*2+g*2
+h+i+j+k+l+m+n+p
)
1000 m
Indoor unit to the nearest branch kit
)
40 m
h, i, j.......
p
)
40 m
The difference between the distance of the outdoor unit to the farthest indoor unit and the distance of the
outdoor unit to the nearest indoor unit
)
40 m
The farthest indoor unit
8
The nearest indoor unit
1
(a+b+c+d+e+f+g+p)–(a+h)
)
40 m
Note 2
When using metric piping, please take into account following table
concerning the weight factor to be allocated.
It should be substituted in the formula for
R
.
Ø9.5
Þ
Ø12.7
Ø15.9
Þ
Ø19.1
Ø22.2
Þ
Ø25.4*
Ø12.7
Þ
Ø15.9
Ø19.1
Þ
Ø22.2
Ø28.6
Þ
Ø31.8*
a
b
c
d
e
f
g
H1
p
A
B
C
D
E
F
G
1
2
3
4
5
6
7
8
H2
h
i
j
k
l
m
n
1
2
3
1
Outdoor unit
2
Refnet joints
(a~g)
3
Indoor units (1~8)
Inch piping
Metric piping
Size (mm)
Weight factor
Size (mm)
Weight factor
Ø6.4
0.022
Ø6
0.018
Ø9.52
0.056
Ø10
0.065
Ø12.7
0.12
Ø12
0.097
Ø15.9
0.18
Ø15
0.16
Ø16
0.18
Ø19.1
0.26
Ø18
0.24
Ø22.2
0.37
Ø22
0.35
6R54974:/3*4+
