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Indoor unit capacity
Piping outer diameter size (mm)
index
Gas pipe
63~140
200
250
D: Piping between refrigerant branch kit and BP
unit
Total capacity index
Piping outer diameter size (mm)
of connected indoor
Gas pipe
units
15~62
63~149
150~208
E: Piping between BP unit and RA DX indoor unit
Indoor unit capacity
Piping outer diameter size (mm)
index
Gas pipe
15~42
50
60
71
4.2.4
To select refrigerant branch kits
For piping example, refer to
"4.2.3 To select the piping size" on
page 8.
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)
8+10
12
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
<200
200≤x<290
290≤x<390
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
<200
200≤x<290
290≤x<390
INFORMATION
Maximum 8 branches can be connected to a header.
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1F – 2017.02
Liquid pipe
15.9
9.5
19.1
22.2
Liquid pipe
12.7
6.4
15.9
9.5
19.1
Liquid pipe
9.5
6.4
12.7
9.5
15.9
Refrigerant branch kit
KHRQ22M29T9
KHRQ22M64T
Refrigerant branch kit
KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
Refrigerant branch kit
KHRQ22M29H
KHRQ22M64H
4.3
Preparing electrical wiring
4.3.1
Safety device requirements
The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage protector in accordance with the applicable legislation.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
Model
Minimum circuit
ampacity
RXYSQ8
18.5 A
RXYSQ10
RXYSQ12
For all models:
▪ Phase and frequency: 3N~ 50 Hz
▪ Voltage: 380-415 V
▪ Transmission line section:
Transmission wiring
Maximum wiring length
(= distance between outdoor
and furthest indoor unit)
Total wiring length
(= distance between outdoor
and all indoors)
If the total transmission wiring exceeds these limits, it may
result in communication error.
5
Installation
5.1
Opening the units
5.1.1
To open the outdoor unit
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING
8 HP
2×
3×
5 Installation
Recommended
fuses
25 A
22 A
25 A
24 A
32 A
Vinyl cords with 0.75 to
1.25 mm² sheath or cables
(2‑core wires)
300 m
600 m
10+12 HP
Installation and operation manual
9
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Troubleshooting
