Daikin Sky Air Advance Series Installer's Reference Manual page 11

Branch pipes ▪ Install the branch pipes horizontally (with a
maximum inclination of 15°) or vertically.
▪ Make the length of the branch pipes to the
indoor units as short as possible.
▪ Try to keep length of the branch pipes to
the indoor units equal.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
Definitions: L1~L7, H1, H2
(a)
Pair
L1
(a)
Triple
L2
L3
L4
L1
(a) Assume that the longest line in the illustration corresponds
with the actual longest pipe, and the highest unit in the
illustration corresponds with the actual highest unit.
L1 Main piping
L2~L7 Branch piping
H1 Height difference between the highest indoor unit and the
outdoor unit
H2 Height difference between the highest and the lowest
indoor unit
Refrigerant piping length and height difference
The piping lengths and height differences must comply with the following requirements:
1 Minimum total one‑way piping length
2 Maximum total piping length
3 Maximum branch piping length
RZA200+250D7Y1B
Sky Air Advance-series
4P573383-1 – 2019.04
(a)
Twin
L2
L3
L1
(a)
Double twin
L4
L2
L5
L6
L3
L7
L1
Requirement
Pair: Limit≤L1
Twin: Limit≤L1+L3
Triple: Limit≤L1+L4
Double twin: Limit≤L1+L3+L7
Pair: L1≤limit
Twin: L1+L2+L3≤limit
Triple: L1+L2+L3+L4≤limit
Double twin:
L1+L2+L3+L4+L5+L6+L7≤limit
Twin and triple: L2≤limit
Double twin: L2+L4≤limit
Refrigerant branch kit
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)
22.2 mm (7/8") 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.
Refrigerant piping diameter
The refrigerant piping diameters must comply with the following:
Piping
L1 (pair, twin, triple, double twin) See below.
L2,L3 (twin)
L2~L4 (triple)
L4~L7 (double twin)
L2,L3 (double twin)
L1 (pair, twin, triple, double twin):
(a)
Model New /
(b)
Existing
RZA200+250D7 Standard
Size‑up
(a) When installing new piping, use the same diameters as
the connections on the outdoor units (i.e. standard
diameters for liquid and gas piping).
(b) When reusing existing piping, you may use the size‑up
diameters, but then capacity might decrease, and stricter
piping length requirements are applicable. Assess these
limitations in relation to the complete installation.
Ø standard
Ø size-up gas pipe
Ø size-up liquid pipe
5 Preparation
(a)
Thickness (t)
Ø
≥0.8 mm
t
≥1.0 mm
Diameter
Use the same diameters as the
connections (liquid, gas) on the
indoor units.
Liquid piping: Ø9.5 mm
Gas piping: Ø22.2 mm
L1 liquid L1 gas piping
piping
Ø9.5 mm Ø22.2 mm
Ø12.7 mm Ø25.4 mm
Limit
(a)
5 m
100 m
100 m
50 m
20 m
Installer reference guide
11