Daikin VRV 5 RXYA8A7Y1B, Installer And User Manual

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18 | Piping installation
Installer and user reference guide
93
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
Size-up of piping
e
e
e
e
h
g g
g h
h
h
b
d
c
a
f
f
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 combinations" [
4
98])
h Piping between last refrigerant branch kit and indoor unit
If a size-up of the piping is required, refer to the table below:
Size up – outer diameter [mm]
HP class Gas piping Liquid piping
5 — 9.5 → 12.7
8~10 19.1 → 22.2
12~14 22.2 → 28.6 12.7 → 15.9
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 amount" [
4
117].
▪ 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
For piping example, refer to "18.1.4 To select the piping size" [
4
91].
▪ 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 KHRQ22M29T9 (inch)
KHRQM22M29T (mm)
12~20 KHRA22M65T (inch)
KHRAM22M65T (mm)