To Select Refrigerant Branch Kits - Daikin VRV 5-S RXYSA8AMY1B Installation And Operation Manual

B: Piping between refrigerant branch kit and SV
units OR between two refrigerant branch kits OR
between two SV units
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.
Example:
▪ Downstream capacity for B' = [capacity index of unit a1] + [unit a2]
+ [unit a3] + [unit a4] + [unit a5] + [unit a6] + [unit a7]
▪ Downstream capacity for B'' = [capacity index of unit a3] +
[unit a4]
▪ Downstream capacity for B''' = [capacity index of unit a10] +
[unit a11]
Indoor unit capacity Piping outer diameter [mm]
index
Gas pipe
<150
150≤x<290
290≤x<390
C: 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 d
f
g
b c g f h
h
a Outdoor unit
b Main pipes (size up if equivalent length >90 m)
c First refrigerant branch kit (refnet)
d Last refrigerant branch kit (refnet)
e Indoor unit
f SV unit
g Piping between first and last refrigerant branch kit (size-
up may be required)
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
8~10 19.1 → 22.2
12 22.2 → 25.4
(a)
If the size-up size of 25.4 mm is NOT available, you must use the
standard size. It is not allowed to size-up to 28.6 mm due to legal
requirements.
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1B – 2024.02
Liquid pipe
15.9 9.5
19.1
22.2 12.7
Liquid pipe
9.5 6.4
12.7
15.9 9.5
19.1
h e
h e
e
e
Liquid piping
9.5 → 12.7
(a)
12.7 → 15.9
▪ 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 "16.2 To determine the additional refrigerant
amount" [ 4 35].
▪ Size-up of both main pipes is required when the equivalent pipe
length between outdoor and indoor units is 90 m or more.
15.1.5

To select refrigerant branch kits

Refrigerant refnets
For piping example, refer to "15.1.4 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
8~12
▪ 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<390
▪ 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<390
INFORMATION
Maximum 8 branches can be connected to a header.
15 Piping installation
size" [ 4 28].
Refrigerant branch kit
KHRQ22M29T9 (inch)
KHRQM22M29T (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)
Installation and operation manual
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