Daikin VRV IV Q+ Series Installer And User Reference Manual page 73

E: Piping between refrigerant branch kit and indoor unit
RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546229-1A – 2020.10
(a)
Ø25.4 applicable in case of 290≤x≤420, if available on the site.
Example:
▪ Downstream capacity for E=capacity index of unit 1
▪ Downstream capacity for D=capacity index of unit 1+capacity index of unit 2
Pipe size for direct connection to indoor unit must be the same as the connection
size of the indoor unit.
Indoor unit
capacity index
Standard
15~50 12.7
63, 80 15.9
100~140
200 19.1
250 22.2
▪ When the equivalent pipe length between outdoor and indoor units is 90 m or
more, the size of the main pipes (both gas side and liquid side) must be
increased. Depending on the length of the piping, the capacity may drop, but
even in such a case the size of the main pipes has to be increased. More
specifications can be found in the technical engineering data book.
a
b
a Outdoor unit
b Main pipes (increase if the equivalent piping length is ≥90 m)
c First refrigerant branch kit
d Piping between refrigerant branch kit and indoor unit
e Indoor unit
HP class
8
10
12+14
16
18~22
24
26~34
36~42
(a)
If the size-up size is NOT available, you must use the standard size. Sizes bigger than the
size-up size are NOT allowed. But even if you use the standard size, the equivalent piping
length is allowed to be more than 90 m.
(b)
Pipe size-up is NOT allowed.
Piping outer diameter size (mm)
Gas pipe
Max.
15.9
19.1
25.4
28.6
e
d
c
Size up
Piping outer diameter size (mm)
Gas pipe
19.1 → 22.2
(a)
22.2 → 25.4
(b)
28.6
(a)
28.6 → 31.8
(b)
34.9
(a)
34.9 → 38.1
(b)
41.3
18 Piping installation
|
Liquid pipe
Standard Max.
6.4 9.5
9.5 12.7
Liquid pipe
9.5 → 12.7
12.7 → 15.9
15.9 → 19.1
19.1 → 22.2
Installer and user reference guide
73