To Select Refrigerant Branch Kits - Daikin VRV 5 RXYA8A7Y1B Installation And Operation Manual

15 Piping installation
Indoor unit capacity Piping outer diameter [mm]
index
Gas pipe
290≤x<392
392≤x<620
620≤x≤650
D: Piping between refrigerant branch kit or SV unit
and indoor unit
Pipe size for direct connection to indoor unit must be the same as
the connection size of the indoor unit (in case indoor unit is VRV DX
indoor).
Indoor unit capacity Piping outer diameter [mm]
index
Gas pipe
10~32
40~80
100~140
200~250
Size-up of piping
a
g g
f
d
c
b g f h
h
a Outdoor unit
b Main pipes (size up if equivalent length >90 m)
c First refrigerant branch kit
d Last refrigerant branch kit
e Indoor unit
f SV unit
g Piping between first and last refrigerant branch kit (size-
up may be required, see Installer and user reference
guide of the outdoor unit)
h Piping between last refrigerant branch kit and indoor unit
If a size-up of the piping is required, refer to the table below:
Size up – outer diameter [mm]
HP class Gas piping
5 —
8~10 19.1 → 22.2
12~14 22.2 → 28.6
16~20 —
▪ 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 changeover from inch to mm
pipes (field supply).
▪ The additional refrigerant calculation has to be adjusted as
mentioned in "16.3 To determine the additional refrigerant
amount" [ 4 37].
▪ Applicable pipe size up is decided upon field piping rules
determined by the installation needs. See technical data and
installer user reference guide for more details about the required
pipe size up for your installation.
Installation and operation manual
30
Liquid pipe
22.2 12.7
28.6
15.9
Liquid pipe
9.5 6.4
12.7
15.9 9.5
19.1
e
h
h e
e
e
Liquid piping
9.5 → 12.7
12.7 → 15.9
15.1.4

To select refrigerant branch kits

Refrigerant refnets
For piping example, refer to "15.1.3 To select the piping
▪ 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 c).
HP class
8+10
12~20
▪ 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.
Indoor unit capacity index
<200
200≤x<290
290≤x≤650
▪ 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
<290
290≤x≤650
INFORMATION
Maximum 8 branches can be connected to a header.
▪ How to choose an outdoor multi connection piping kit. Choose
from the following table, in accordance with the number of outdoor
units.
Number of outdoor units
2
For multi combination of models RXYA8~12 + RYMA5 there is an
additional equalising pipe (in addition to the conventional gas and
liquid piping).
The equalising pipe connections for the different modules are
mentioned in below table.
RXYA8~12 + RYMA5
5~12
There is never a connection of the equalising pipe with the indoor
units.
Example: Multi combination RXYA8 + RXYA12
Ø19.1 mm
Ø19.1 mm
Only the equalising pipe is shown
size" [ 4 29].
Refrigerant branch kit
KHRQ22M29T9 (inch)
KHRQM22M29T (mm)
KHRA22M65T (inch)
KHRAM22M65T (mm)
Refrigerant branch kit
KHRQ22M20TA (inch)
KHRQM22M20T (mm)
KHRQ22M29T9 (inch)
KHRQM22M29T (mm)
KHRA22M65T (inch)
KHRAM22M65T (mm)
Refrigerant branch kit
KHRQ22M29H (inch)
KHRQM22M29H9 (mm)
KHRA22M65H (inch)
KHRAM22M65H (mm)
Model name
BHFA22P1007 (inch)
BHFAM22P1007 (mm)
Equalising pipe Ø (mm)
19.1
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P739915-1 – 2023.12