Daikin VRV IV Series - Page 68

16 | Piping installation
Installer and user reference guide
68
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Compressor unit capacity
type
Piping outer diameter size (mm)
Gas pipe Liquid pipe
5HP 19.1 12.7
8HP 22.2
B: Piping between compressor unit and first refrigerant branch kit
Use the following diameters:
Compressor unit capacity
type
Piping outer diameter size (mm)
Gas pipe Liquid pipe
Standard Size-up Standard Size-up
5HP 15.9 19.1 9.5 —
8HP 19.1 22.2 9.5 12.7
Standard ↔ Size-up:
If Then
The equivalent pipe
length between the
heat exchanger unit
and the furthest indoor
unit is 90m or more
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).
C: Piping between refrigerant branch kits
Use the following diameters:
Indoor unit capacity index Piping outer diameter size (mm)
Gas pipe Liquid pipe
<150 15.9 9.5
150≤x<200 19.1
200≤x<260 22.2
D: Piping between refrigerant branch kit and indoor unit
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 Piping outer diameter size (mm)
Gas pipe Liquid pipe
15~50 12.7 6.4