5
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Preparation
Installer and user reference guide
31
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
5.3.2 To select the piping size
Determine the proper size using the following tables and reference figure (only for
indication).
A
B
B
B
C
D
F
G
E
x
y
b
a
3
1
2
4
5
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
A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
Choose from the following table in accordance with the outdoor unit total capacity
type, connected downstream.
Outdoor unit capacity
type (HP)
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
8
19.1
9.5
10
22.2
9.5
12~16
28.6
12.7
18~22
28.6
15.9
24
34.9
15.9
26~34
34.9
19.1
36~54
41.3
19.1
D: Piping between refrigerant branch kits
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
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
<150
15.9
9.5
150≤x<200
19.1
200≤x<290
22.2
290≤x<420
28.6
12.7
420≤x<640
15.9
640≤x<920
34.9
19.1
≥920
41.3
Summary of Contents for VRV IV+
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