17
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Piping installation
Installer and user reference guide
72
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
e
d
b
c
a
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
36~54
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"
97].
F: Piping between refrigerant branch kit and branch selector box (BP box)
Pipe size for direct connection on branch selector box (BP*) must be based on the
total capacity of the connected indoor units (only in case RA DX indoor units are
connected).
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