Refrigerant Piping Material; To Select The Piping Size - Daikin RXYSQ8TMY1B Installation And Operation Manual

4 Preparation
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
4.2.2

Refrigerant piping material

▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping temper grade and thickness:
Outer diameter Temper grade
(Ø)
6.4 mm (1/4") Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8") Annealed (O)
19.1 mm (3/4") Half hard (1/2H)
22.2 mm (7/8")
25.4 mm (1") Half hard (1/2H)
28.6 mm (1‑1/8") Half hard (1/2H)
(a) Depending on the applicable legislation and the unit's
maximum working pressure (see "PS High" on the unit
name plate), larger piping thickness might be required.
4.2.3

To select the piping size

Determine the proper size referring to following tables and reference
figure (only for indication).
INFORMATION
▪ Combination of VRV DX and RA DX indoor units is not
allowed.
▪ Combination of RA DX and AHU indoor units is not
allowed.
▪ Combination of RA DX and aircurtain indoor units is not
allowed.
INFORMATION
In case of RXYSQ8: If you install RA DX indoor units, you
have to configure field setting [2‑41] (= type of installed
indoor units). See "6.1.8 Mode 2: Field settings" on
page 23.
In case of RXYSQ10+12: The type of indoor units is
detected automatically.
VRV DX
1
A
2
B-1 B-2
2 2
C-1 C-2 C-3 C-4
3-1 3-2 3-3 3-4
1 Outdoor unit
2 Refrigerant branch kits
3-1~3-4 VRV DX indoor units
4 BP units
5 RA DX indoor units
A Piping between outdoor unit and (first) refrigerant branch
kit
B-1 B-2 Piping between refrigerant branch kits
C-1~C-4 Piping between refrigerant branch kit and indoor unit
D Piping between refrigerant branch kit and BP unit
E Piping between BP unit and RA DX indoor unit
Installation and operation manual
8
(a)
Thickness (t)
Ø
≥0.80 mm
t
≥0.99 mm
≥0.80 mm
≥0.88 mm
≥0.99 mm
RA DX
1
A
2
D D
4 4
E E E E
5 5 5 5
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 15.
A: Piping between outdoor unit and (first)
refrigerant branch kit
When the equivalent pipe length between outdoor and indoor units is
90 m or more, the size of the main pipes (both gas side and liquid
side) must be increased. Depending on the length of the piping, the
capacity may drop, but even in such a case the size of the main
pipes has to be increased. More specifications can be found in the
technical engineering data book.
b c
a
d
a Outdoor unit
b Main pipes
c Increase
d First refrigerant branch kit
e Indoor unit
Outdoor unit Piping outer diameter size (mm)
capacity type (HP)
Gas pipe
Standard
8 19.1
10 22.2
(b)
12 25.4
(a) If size is NOT available, increase is NOT allowed.
(b) If size is NOT available, increase to 28.6 mm is allowed.
B: Piping between refrigerant branch kits
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.
Indoor unit capacity Piping outer diameter size (mm)
index
Gas pipe
<150
150≤x<200
200≤x<290
290≤x<390
Example: Downstream capacity for B-1 = capacity index of unit 3-1
+ capacity index of unit 3-2
C: 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
e
Liquid pipe
Size-up Standard Size-up
22.2 9.5 12.7
(a)
25.4
28.6 12.7 15.9
Liquid pipe
15.9 9.5
19.1
22.2
28.6 12.7
Liquid pipe
12.7 6.4
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P400263-1F – 2017.02