To Select The Piping Size; To Select Refrigerant Branch Kits; Preparing Electrical Wiring; Safety Device Requirements - Daikin RKXYQ5T7Y1B Installation And Operation Manual

4 Preparation
4.2.3

To select the piping size

Determine the proper size referring to following tables and reference
figure (only for indication).
c
a
EKEXV
A B
b
a Heat exchanger unit
b Compressor unit
c Refrigerant branch kit
VRV DX VRV DX indoor unit
EKEXV Expansion valve kit
AHU Air handling unit
A Piping between heat exchanger unit and compressor unit
B Piping between compressor unit and (first) refrigerant
branch kit (= main pipe)
C Piping between refrigerant branch kits
D Piping between refrigerant branch kit and indoor unit
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the following
into account:
▪ Select the pipe size nearest to the required size.
▪ Use the suitable adapters for the change-over from inch to mm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in "5.6.2 To determine the additional refrigerant
amount" on page 12.
A: Piping between heat exchanger unit and
compressor unit
Use the following diameters:
Compressor unit Piping outer diameter size (mm)
capacity type (HP)
Gas pipe
5
B: Piping between compressor unit and (first)
refrigerant branch kit
If the equivalent pipe length between the heat exchanger unit and
the furthest indoor unit is 90 m or more, it is recommended to
increase the size (size-up) of the main gas pipe (between
compressor unit and first refrigerant branch kit). If the recommended
gas pipe (size-up) is not available, you must use the standard size
(which might result in a small capacity decrease).
Compressor unit Piping outer diameter size (mm)
capacity type (HP)
Gas pipe
Standard
5 15.9
C: Piping between refrigerant branch kits
Use the following diameters:
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
<150
Installation and operation manual
6
D
C
c
D
D
VRV DX
D
AHU
VRV DX
Liquid pipe
19.1 12.7
Liquid pipe
Size-up
19.1 9.5
Liquid pipe
15.9 9.5
D: 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
When using refnet joints, choose from the following table in
accordance with the capacity of the compressor unit. Example:
Refnet joint c.
Compressor unit capacity type
(HP)
5
Refnet headers
When using refnet headers, choose from the following table in
accordance with the capacity of the compressor unit.
Compressor unit capacity type
(HP)
5
INFORMATION
Maximum 8 branches can be connected to a header.
4.3

Preparing electrical wiring

4.3.1

Safety device requirements

NOTICE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
Power supply: Compressor unit
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
RKXYQ5 13.5 A
▪ Phase and frequency: 3N~ 50 Hz
▪ Voltage: 380-415 V
Transmission wiring
Transmission line section:
Transmission wiring
VRV IV compressor unit for indoor installation
Liquid pipe
12.7 6.4
15.9 9.5
Refrigerant branch kit
KHRQ22M20T
Refrigerant branch kit
KHRQ22M29H
Recommended
fuses
16 A
Sheathed + shielded cable (2
wires)
Vinyl cords
0.75~1.25 mm²
RKXYQ5T7Y1B
4P408443-1 – 2015.07