Selection Of Piping Size - Daikin RXYQ6BRY16 Installation Manual

9.2 Selection of piping size

Determine the proper size referring to following tables
and reference figure (only for indication).
x
A
a
D
3
b
E
1 2
1, 2 VRV indoor unit
3 BP unit (1 module system only)
4, 5 Mini-split indoor unit (1 module system only)
a, b Refrigerant branching kit
x, y Outdoor unit multi connection piping kit
9.2.1 Piping between outdoor unit and (first)
refrigerant branch kit: A, B, C
Choose from the following table in accordance with the
outdoor unit total capacity type, connected downstream.
Outdoor unit
capacity type (HP)
6~8
10
12~16
18~22
24
26~34
36~72
9.2.2 Piping between refrigerant branch kits: D
Choose from the following table in accordance with the
indoor unit total capacity index, connected downstream.
Do not let the connection piping exceed the refrigerant
piping size chosen by the general system model name.
Total indoor unit
capacity index
<150
150≤x<200
200≤x<290
290≤x<420
420≤x<640
640≤x<920
≥920
Example:
Downstream capacity for D = capacity index of unit 1 +
capacity index of unit 2
01_EN_3P748230-1.indd 17
B B B
y
C
F
G
4 5
Piping outer diameter size (mm)
Liquid pipe Gas pipe
Ø19.1
Ø9.5
Ø22.2
Ø12.7
Ø28.6
Ø15.9
Ø34.9
Ø19.1
Ø41.3
Piping outer diameter size (mm)
Liquid pipe Gas pipe
Ø15.9
Ø9.5 Ø19.1
Ø22.2
Ø12.7
Ø28.6
Ø15.9
Ø34.9
Ø19.1
Ø41.3
9.2.3 Piping between refrigerant branch kit and
BP unit: F
Pipe size for direct connection on BP unit must be
based on the total capacity of the connected indoor
units (only in case Mini-split indoor units are connected).
Piping outer diameter size (mm)
Total capacity index to
connected indoor units.
Liquid pipe
20~62
63~149
150~208
~250
Example:
Downstream capacity for F = capacity index of unit 4 +
capacity index of unit 5
9.2.4 Piping between BP unit and Mini-split indoor
unit: G
Only in case Mini-split indoor units are connected.
Piping outer diameter size (mm)
Indoor unit
capacity index
Liquid pipe
20, 25, 30, 35
50
60
71 (c)
(c) I n some indoor units, the piping size is difference.
Choose from the size of each indoor units.
9.2.5 Piping between refrigerant branch kit and
indoor unit: E
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 indoor).
Piping outer diameter size (mm)
Indoor unit
capacity index
Liquid pipe
20, 25, 32, 40, 50
63, 80, 100, 125, 140
200
250
400
500
Gas pipe
Ø6.4 Ø12.7
Ø15.9
Ø9.5 Ø19.1
Ø22.2
Gas pipe
Ø9.5
Ø6.4 Ø12.7
Ø15.9
Gas pipe
Ø6.4 Ø12.7
Ø15.9
Ø9.5 Ø19.1
Ø22.2
Ø12.7
Ø28.6
Ø15.9
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