18
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Piping installation
Installer and user reference guide
83
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
b
Main pipes (increase size)
c
First refrigerant branch kit
d
Last refrigerant branch kit
e
Indoor unit
f
BS unit
g
Piping between first and last refrigerant branch kit (increase size)
h
Piping between last refrigerant branch kit and indoor unit
Size up
HP class
Liquid piping outer diameter [mm]
5~10
9.5
→
12.7
12~24
12.7
→
15.9
26~28
15.9
→
19.1
▪
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
"19.4 To determine the additional refrigerant amount"
▪
Applicable pipe size up is decided upon field piping rules determined by the
installation needs. See technical data and installer user reference guide for more
details about the required pipe size up for your installation.
18.1.5 To select refrigerant branch kits
Refrigerant refnets
"18.1.4 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 c).
HP class
Refrigerant branch kit
8+10
KHRQ23M29T9
12~20
KHRQ23M64T
22~28
KHRQ23M75T
▪
For refnet joints other than the first branch, select the proper branch kit model
based on the total capacity index of all indoor units connected after the
refrigerant branch.
Indoor unit capacity index
Refrigerant branch kit
<200
KHRQ23M20T
200≤x<290
KHRQ23M29T9
290≤x<640
KHRQ23M64T
≥640
KHRQ23M75T
▪
Concerning refnet headers, choose from the following table in accordance with
the total capacity of all the indoor units connected below the refnet header.
Indoor unit capacity index
Refrigerant branch kit
<290
KHRQ23M29H
