17
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Piping installation
Installer and user reference guide
63
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
a
Outdoor unit
b
Main pipes (increase if the equivalent piping length is ≥90 m)
c
First refrigerant branch kit
d
Piping between refrigerant branch kit and indoor unit
e
Indoor unit
Size up
HP class
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
8
19.1 → 22.2
9.5 → 12.7
10
22.2 → 25.4
(a)
12+14
28.6
(b)
12.7 → 15.9
16
28.6 → 31.8
(a)
18~22
15.9 → 19.1
24
34.9
(b)
26~34
34.9 → 38.1
(a)
19.1 → 22.2
36~48
41.3
(b)
(a)
If the size-up size is NOT available, you must use the standard size. Sizes bigger than the
size-up size are NOT allowed. But even if you use the standard size, the equivalent piping
length is allowed to be more than 90 m.
(b)
Pipe size-up is NOT allowed.
▪
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.
Pipe Ø (mm)
Minimal thickness t (mm)
6.4/9.5/12.7
0.80
15.9
0.99
19.1/22.2
0.80
28.6
0.99
34.9
1.21
41.3
1.43
▪
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).
-
The additional refrigerant calculation has to be adjusted as mentioned in
"17.4.3 To determine the additional refrigerant amount"
17.1.4 To select refrigerant branch kits
Refrigerant refnets
"17.1.3 To select the piping size"
▪
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 (example: refnet joint a).
