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

5.3.2 To select the piping size

A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
D: Piping between refrigerant branch kits
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
Determine the proper size using the following tables and reference figure (only for
indication).
a
D F
b 3
E
1 2 4
1,2 VRV DX indoor unit
3 Branch selector box (BP*)
4,5 RA DX indoor unit
a,b 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)
8
10
12~16
18~22
24
26~34
36~54
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
<150
150≤x<200
200≤x<290
290≤x<420
420≤x<640
640≤x<920
≥920
B B
A
x
C
y
G
5
Piping outer diameter size (mm)
Gas pipe
19.1
22.2
28.6
28.6
34.9
34.9
41.3
Piping outer diameter size (mm)
Gas pipe
15.9
19.1
22.2
28.6
34.9
41.3
5 Preparation
|
B
Liquid pipe
9.5
9.5
12.7
15.9
15.9
19.1
19.1
Liquid pipe
9.5
12.7
15.9
19.1
Installer and user reference guide
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