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Piping installation
Installer and user reference guide
68
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
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 amount"
A: Piping between outdoor unit and (first) refrigerant branch kit
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).
e
d
b
c
a
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)
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
Standard
Size-up
4+5
15.9
19.1
9.5
6
19.1
22.2
B: 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≤182
19.1
Example:
Downstream capacity for B-1 = capacity index of unit 3-1 + capacity index
of unit 3-2
C: Piping between refrigerant branch kit and indoor unit
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
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
15~50
12.7
6.4
63~140
15.9
9.5
Содержание VRV IV-S RXYSQ4T8VB Series
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