Daikin RXYSQ4T8VB Series Installer And User Reference Manual page 68

18 | Piping installation
A: Piping between outdoor unit and (first) refrigerant branch kit
B: Piping between refrigerant branch kits
C: Piping between refrigerant branch kit and indoor unit
Installer and user reference guide
68
In case the required pipe sizes (inch sizes) are not available, it is also allowed to use
other diameters (mm sizes), taken the following into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch to mm pipes (field
supply).
▪ The additional refrigerant calculation has to be adjusted as mentioned in
determine the additional refrigerant
When the equivalent pipe length between outdoor unit and the furthest indoor
unit is 90 m or more (b+d), the size of the main gas pipe (b) must be increased
(size-up). If the recommended gas pipe (size-up) is not available, you must use the
standard size (which might result in a small capacity decrease).
a
b
a Outdoor unit
b Main gas pipe (increase piping size if length b+d ≥ 90 m)
c First refrigerant branch kit
d Piping between indoor unit and first refrigerant branch kit
e Furthest indoor unit
Outdoor unit capacity
type (HP)
4+5
6
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≤182
Example: Downstream capacity for B-1 = capacity index of unit 3-1 + capacity index
of unit 3-2
Use the same diameters as the connections (liquid, gas) on the indoor units. The
diameters of the indoor units are as follows:
Indoor unit capacity index
15~50
63~140
4
amount" [
e
d
c
Piping outer diameter size (mm)
Gas pipe
Standard Size-up
15.9 19.1
19.1 22.2
Piping outer diameter size (mm)
Gas pipe
15.9
19.1
Piping outer diameter size (mm)
Gas pipe
12.7
15.9
84].
Liquid pipe
9.5
Liquid pipe
9.5
Liquid pipe
6.4
9.5
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
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