To Select The Piping Size - Daikin VRV IV Q+ Series Installer And User Reference Manual

18 | Piping installation

18.1.3 To select the piping size

A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
D: Piping between refrigerant branch kits
Installer and user reference guide
72
Determine the proper size using the following tables and reference figure (only for
indication).
a
D
b c
E
1 2 3
1~4 VRV DX indoor unit
a,b,c Indoor branch kit
x,y Outdoor multi connection kit
Choose from the following table in accordance with the outdoor unit total capacity
type, connected downstream.
Outdoor unit
capacity type
(HP)
Standard
8 19.1
10 22.2
12~16 28.6
18~22 28.6
24 34.9
26~34 34.9
36~42 41.3
Choose from the following table in accordance with the indoor unit total capacity
type, connected downstream. Do not let the connection piping exceed the
refrigerant piping size chosen by the general system model name.
Indoor unit
capacity index
Standard
<150 15.9
150≤x<200 19.1
200≤x<290 22.2
290≤x<420 28.6
420≤x<640
640≤x<920 34.9
≥920 41.3
B B
A
x
C
y
4
Piping outer diameter size (mm)
Gas pipe
Max.
28.6
34.9
41.3
54.1
Piping outer diameter size (mm)
Gas pipe
Max.
19.1
25.4
28.6
(a)
34.9
54.1
B
Liquid pipe
Standard Max.
9.5 15.9
9.5
12.7
15.9 19.1
15.9
19.1 22.2
19.1
Liquid pipe
Standard Max.
9.5 12.7
15.9
12.7
15.9 19.1
19.1 22.2
RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546229-1A – 2020.10