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Piping installation
Installer and user reference guide
73
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Indoor unit capacity index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
63~140
15.9
9.5
200
19.1
250
22.2
▪
If a size-up of the piping is required, refer to the table below.
e
d
b
c
a
a
Outdoor unit
b
Main pipes (increase size)
c
First refrigerant branch kit
d
Piping between refrigerant branch kit and indoor unit
e
Indoor unit
Size up
HP class
Liquid piping outer diameter size (mm)
5~8
9.5
→
12.7
10
12+14
12.7
→
15.9
16
18~22
15.9
→
19.1
24
26~34
19.1
→
22.2
36~54
▪
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
determine the additional refrigerant amount"
98].
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