To Select Refrigerant Branch Kits; Preparing Electrical Wiring; Safety Device Requirements; Installation - Daikin RXYSQ6T7Y1B9 Installation And Operation Manual

a b c
d
a Outdoor unit
b Main gas pipe
c Increase
d First refrigerant branch kit
e Indoor unit
Outdoor unit Piping outer diameter size (mm)
capacity type (HP)
Gas pipe
Standard
6 19.1
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 Piping outer diameter size (mm)
index
Gas pipe
<150
150≤x≤176
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 Piping outer diameter size (mm)
index
Gas pipe
15~50
63~140
4.2.4

To select refrigerant branch kits

For piping example, refer to "4.2.3 To select the piping size" on
page 6.
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)
6
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
<176
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.
RXYSQ6T7Y1B9
VRV IV-S system air conditioner
4P397285-1B – 2016.03
e
Liquid pipe
Size-up
22.1 9.5
Liquid pipe
15.9 9.5
19.1
Liquid pipe
12.7 6.4
15.9 9.5
Refrigerant branch kit
KHRQ22M20T
Refrigerant branch kit
KHRQ22M20T
Indoor unit capacity index
<176
INFORMATION
Maximum 8 branches can be connected to a header.
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
RXYSQ6_Y1 14.1 A
Transmission wiring
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
2
1
1×
5 Installation
Refrigerant branch kit
KHRQ22M29H
Recommended Power supply
fuses
16 A 3N~ 50 Hz
380-415 V
Vinyl cords with 0.75 to 1.25 mm²
sheath or cables (2‑core wires)
300 m
600 m
Installation and operation manual
7