To Select Refrigerant Branch Kits - Daikin VRV 5 RXYA8A7Y1B Installer And User Manual

Size-up of piping

18.1.5 To select refrigerant branch kits

RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
a
g
c
b g
a Outdoor unit
b Main pipes (size up if equivalent length >90 m)
c First refrigerant branch kit
d Last refrigerant branch kit
e Indoor unit
f SV unit
g Piping between first and last refrigerant branch kit (size-up may be required, see
"18.1.8 Single and multi-outdoor-unit
h Piping between last refrigerant branch kit and indoor unit
If a size-up of the piping is required, refer to the table below:
HP class
5
8~10
12~14
16~20
▪ 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 changeover from inch to mm pipes (field
supply).
- The additional refrigerant calculation has to be adjusted as mentioned in
"19.3 To determine the additional refrigerant
▪ 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.
Refrigerant refnets
For piping example, refer to
▪ 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
8+10
12~20
h e
g
f
d
h e
f h e
e
h
combinations" [
Size up – outer diameter [mm]
Gas piping
—
19.1 → 22.2
22.2 → 28.6
—
"18.1.4 To select the piping
18 Piping installation
|
4
98])
Liquid piping
9.5 → 12.7
12.7 → 15.9
4
amount" [ 117].
4
size" [ 91].
Refrigerant branch kit
KHRQ22M29T9 (inch)
KHRQM22M29T (mm)
KHRA22M65T (inch)
KHRAM22M65T (mm)
Installer and user reference guide
93