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RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
Installation and operation manual
12
9.3.1.
Piping between outdoor unit and (first) refrigerant
branch kit: A, B, C
Choose from the following table in accordance with the outdoor unit
total capacity type, connected downstream.
9.3.2.
Piping between refrigerant branch kits: D
Choose from the following table in accordance with the indoor unit
total capacity type, connected downstream. Do not let the connection
piping exceed the refrigerant piping size chosen by the general
system model name.
Example:
Downstream capacity for E=capacity index of unit 1
Downstream capacity for D=capacity index of unit 1+capacity index
of unit 2
9.3.3.
Piping between refrigerant branch kit and BP unit: F
Pipe size for direct connection on BP unit must be based on the total
capacity of the connected indoor units (only in case RA DX indoor
units are connected).
Example:
Downstream capacity for F=capacity index of unit 4+capacity index of
unit 5
9.3.4.
Piping between BP unit and RA DX indoor unit: G
Only in case RA DX indoor units are connected.
9.3.5.
Piping between refrigerant branch kit and indoor unit: E
Pipe size for direct connection to indoor unit must be the same as the
connection size of the indoor unit (in case indoor unit is VRV DX
indoor or Hydrobox).
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.
1
Outdoor unit
2
Main pipes
3
Increase
4
First refrigerant branch kit
5
Indoor unit
The pipe thickness of the refrigerant piping shall comply with the
applicable legislation. The minimal pipe thickness for R410A
piping must be in accordance with the table below.
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
- Select the pipe size nearest to the required size.
- Use the suitable adapters for the change-over from inch
to mm pipes (field supply).
In this case, the additional refrigerant calculation has to be
adjusted as mentioned in
"14. Charging refrigerant" on page 31
.
Outdoor unit capacity
type (HP)
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
8
19.1
9.5
10
22.2
12~16
28.6
12.7
18~22
15.9
24
34.9
26~34
19.1
36~54
41.3
Indoor unit capacity
index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
<150
15.9
9.5
150
≤
x<
200
19.1
200
≤
x<290
22.2
290
≤
x<420
28.6
12.7
420
≤
x<640
15.9
640
≤
x<920
34.9
19.1
>920
41.3
19.1
Total capacity index of connected
indoor units
Gas pipe
(mm)
Liquid pipe
(mm)
20-62
12.7
6.4
63-149
15.9
9.5
150-208
19.1
Indoor unit capacity index
Gas pipe (mm)
Liquid pipe (mm)
20, 25, 30
9.5
6.4
50
12.7
60
9.5
71
15.9
Indoor unit capacity index
Piping outer diameter size
(mm)
Gas pipe
Liquid pipe
15, 20, 25, 32, 40, 50
12.7
6.4
63, 80, 100, 125
15.9
9.5
200
19.1
250
22.2
Size up
HP Class
Gas side (mm)
Liquid size (mm)
8
19.1
→
22.2
9.5
→
12.7
10
22.2
→
25.4
(a)
(a) If size is NOT available, increase is NOT allowed.
12+14
28.6
(b)
(b) Increase is NOT allowed.
12.7
→
15.9
16
28.6
→
31.8
(a)
18~22
28.6
→
31.8
(a)
15.9
→
19.1
24
34.9
(b)
15.9
→
19.1
26~34
34.9
→
38.1
(a)
19.1
→
22.2
36~54
41.3
(b)
Pipe Ø (mm)
Minimal thickness t (mm)
6.4
0.80
9.5
12.7
15.9
0.99
19.1
0.80
22.2
28.6
0.99
34.9
1.21
41.3
1.43
1
5
2
3
4
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