17
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Piping installation
Installer and user reference guide
62
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
Outdoor unit capacity
type (HP)
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
12~16
28.6
12.7
18~22
28.6
15.9
24
34.9
15.9
26~34
34.9
19.1
36~48
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
Example:
▪
Downstream capacity for E=capacity index of unit 1
▪
Downstream capacity for D=capacity index of unit 1+capacity index of unit 2
E: Piping between refrigerant branch kit and indoor unit
Pipe size for direct connection to indoor unit must be the same as the connection
size of the indoor unit (in case indoor unit is VRV DX indoor).
Indoor unit capacity index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
15~50
12.7
6.4
63~140
15.9
9.5
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.
e
d
b
c
a
