18 | Piping installation
Installer and user reference guide
83
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
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
0≤x≤182 15.9 9.5
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
10~32 9.5 6.4
40~80 12.7 6.4
100~140 15.9 9.5
18.1.4 To select refrigerant branch kits
For piping example, refer to "18.1.3To select the piping size"[482].
Refnet joint at first branch (counting from outdoor unit)
When using refnet joints at the first branch counted from the outdoor unit side,
choose from the following table in accordance with the capacity of the outdoor
unit. Example: Refnet joint A→B‑1.
Outdoor unit capacity type (HP) Refrigerant branch kit
4~6 KHRQ22M20TA
Refnet joints at other branches
For refnet joints other than the first branch, select the proper branch kit model
based on the total capacity index of all indoor units connected after the refrigerant
branch. Example: Refnet joint B‑1→C‑1.
Indoor unit capacity index Refrigerant branch kit
<182 KHRQ22M20TA
Refnet headers
Concerning refnet headers, choose from the following table in accordance with the
total capacity of all the indoor units connected below the refnet header.
Indoor unit capacity index Refrigerant branch kit
<182 KHRQ22M29H
INFORMATION
Maximum 8 branches can be connected to a header.
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