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Piping installation
Installer and user reference guide
68
R R8T7V1B
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