Daikin RXYSQ-P8Y1 Technical Data Manual page 36

11 Installation
11 - 2 Refrigerant Pipe Selection
RXYSQ-P8Y1B
Example of connection
(Connection of 8 units heat pump system)
indoor unit
1
refrigerant branch kit (refnet joint)
BP unit
BP 1
The refrigerant branch kits must be positioned as close to the BP units as
11
possible (c, d, e must be as short as possible).
Between outdoor and BP units
Maximum
allowable Between BP and indoor units
length
Between BP and an indoor unit
Minimum allowable Between outdoor unit and the fi rst
length(*) refrigerant branch kit
Between outdoor and indoor units
Between outdoor and BP units
Allowable height
Between BP and BP units
Between indoor and indoor units
Allowable length after the branch
Refrigerant branch kit selection
Refrigerant branch kits can only be used with R410A.
(*) The refrigerant sound from the outdoor unit can be transmitted.
Pipe size selection
How to calculate the additional refrigerant to be charged
Additional refrigerant to be charged R (kg)
R should be rounded off in units of 0.1 kg
34
• Outdoor Unit • VRVIII-S heat pump • RXYSQ-P8Y1
Pipe length between outdoor and BP units 55 m
Total pipe length
[Example] 3 BP units: a+b+c+d+e 55 m
Piping length between BP and indoor units: RXYSQ4 60 m, RXYSQ5 80 m, RXYSQ6 90 m
Total pipe length
[Example] RXYSQ5: f+g+h+i+j+k+l+m 80 m
Pipe length between BP and an indoor unit: 15 m
1 room length
[Example] f, g, h, i, j, k, l, m 15 m
Pipe length between outdoor unit and first refrigerant branch kit: 5 m
Pipe length
[Example] a 5 m
Difference in height Difference in height between outdoor and indoor units (H1) 30 m
Difference in height Difference in height between outdoor and BP units (H2) 30 m
Difference in height Difference in height between BP and BP units (H3) 15 m
Difference in height Difference in height between indoor and indoor units (H4) 15 m
Pipe length from first refrigerant branch kit (refnet joint) to indoor unit 40 m
[Example] unit 8: b+c+m 40 m
Pipe length
[Example] unit 6: b+e+k 40 m
[Example] unit 3: d+h 40 m
Use the following refnet joint: KHRQ22M20T.
Between outdoor and fi rst
refrigerant branch kit
Between refrigerant branch kit and
refrigerant branch kit
Between refrigerant branch kit and
BP unit
Qc, Qd, Qe is total connected indoor capacity.
c, d, e indicates the symbols in the fi gure.
Total length (m) of liquid
R=
piping size at Ø9.5 )
• VRV Systems • Outdoor Unit
Branch with refnet joint
a b
A B
H2
d e
BP 1 BP2
H1
f g h i j k
1 2 3 4 5
Piping size (outer diameter x minimum
thickness)
Symbol Gas pipe Liquid pipe
a Ø19.1x1.0
b Ø15.9x1.0
Total indoor
Gas pipe Liquid pipe
capacity Q
Qc, Qd, Qe
c, d, e Ø12.7x0.8
5.0 kW
Qc, Qd, Qe
Ø15.9x1.0
>5.0 kW
Example for refrigerant branch using refnet joint
Total length (m) of liquid
x0.054+ x0.022
a: Ø9.5x10 m
piping size at Ø6.4 )
b: Ø9.5x10 m
c: Ø6.4x10 m
R=[40 x 0.054] + [78 x 0.022] = 3.876
c
H3
BP 3
l
6
m
7
H4
8
Example
Indoor 4: 2.5 kW
Indoor 5: 3.5 kW Qe=11.0 kW
Indoor 6: 5.0 kW
Ø9.5x0.8
(Gas pipe) Ø15.9x1.0 and (liquid pipe) Ø9.5x0.8
Ø6.4x0.8
Ø9.5x0.8
d: Ø9.5x10 m g: Ø6.4x10 m j: Ø6.4x10 m m: Ø6.4x8 m
e: Ø9.5x10 m h: Ø6.4x10 m k: Ø6.4x5 m
f: Ø6.4x10 m i: Ø6.4x10 m l: Ø6.4x5 m
3.9 kg
4PW66305-1