17
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Piping installation
Installer and user reference guide
75
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
Indoor unit capacity index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
63~140
15.9
9.5
200
19.1
250
22.2
17.1.4 To select refrigerant branch kits
Refnet joint at first branch (counting from the compressor unit)
When using refnet joints at the first branch counted from the compressor unit side,
choose from the following table in accordance with the capacity of the compressor
unit.
Example:
Refnet joint c (B→C/D).
Compressor unit capacity type
Refrigerant branch kit
5 HP
KHRQ22M20T
8 HP
KHRQ22M29T9
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 c (C→D/D).
Indoor unit capacity index
Refrigerant branch kit
<200
KHRQ22M20T
200≤x<260
KHRQ22M29T9
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
<260
KHRQ22M29H
INFORMATION
Maximum 8 branches can be connected to a header.
17.1.5 Refrigerant piping length and height difference
The piping lengths and height differences must comply with the following
requirements.
H1
H2
H3
H5
L1
a
L2
L3
L4
L5
L6
L7
H4
b
EKEXV
AHU
VRV DX
VRV DX
c
c
a
Heat exchanger unit
