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Piping installation
Installer and user reference guide
69
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
D: Piping between refrigerant branch kit and BP unit
Total capacity index of
connected indoor units
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
15~62
12.7
6.4
63~149
15.9
9.5
150~182
19.1
E: Piping between BP unit and RA DX indoor unit
Indoor unit capacity index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
15~42
9.5
6.4
50
12.7
60
9.5
71
15.9
18.1.4 To select refrigerant branch kits
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
KHRQ22M20T
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
KHRQ22M20T
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.