Daikin RDXYQ5T8V1B Installer And User Manual page 68

16 | Piping installation
B: Piping between compressor unit and first refrigerant branch kit
C: Piping between refrigerant branch kits
D: Piping between refrigerant branch kit and indoor unit
Installer and user reference guide
68
Compressor unit capacity
type
5 HP
8 HP
Use the following diameters:
Compressor unit capacity
type
5 HP
8 HP
Standard ↔ Size-up:
If
The equivalent pipe
length between the
heat exchanger unit
and the furthest indoor
unit is 90 m or more
Use the following diameters:
Indoor unit capacity index
<150
150≤x<200
200≤x<260
Use the same diameters as the connections (liquid, gas) on the indoor units. The
diameters of the indoor units are as follows:
Indoor unit capacity index
15~50
Piping outer diameter size (mm)
Gas pipe
19.1
22.2
Piping outer diameter size (mm)
Gas pipe
Standard Size-up
15.9 19.1
19.1 22.2
5 HP It is recommended to increase the size (size-up)
of the main gas pipe (between compressor unit
and first refrigerant branch kit). If the
recommended gas pipe (size-up) is not available,
you must use the standard size (which might
result in a small capacity decrease).
8 HP ▪ You must increase the size (size-up) of the
main liquid pipe (between compressor unit
and first refrigerant branch kit).
▪ It is recommended to increase the size (size-
up) of the main gas pipe (between
compressor unit and first refrigerant branch
kit). If the recommended gas pipe (size-up) is
not available, you must use the standard size
(which might result in a small capacity
decrease).
Piping outer diameter size (mm)
Gas pipe
15.9
19.1
22.2
Piping outer diameter size (mm)
Gas pipe
12.7
Liquid pipe
12.7
Liquid pipe
Standard Size-up
9.5 —
9.5 12.7
Then
Liquid pipe
9.5
Liquid pipe
6.4
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12