Daikin Sky Air Advance Series - Refrigerant Piping Specifications

5 Preparation
Installer reference guide
11
RZA200+250D7Y1B
Sky Air Advance-series
4P573383-1 – 2019.04
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
Pair
(a)
H1
L1
Twin
(a)
H1
H2
L1
L2
L3
Triple
(a)
L2
L3
L4
H1
H2
L1
Double twin
(a)
H1
H2
L1
L2
L3
L4
L5
L6
L7
(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 branch kit
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade Thickness (t)
(a)
6.4mm (1/4")
9.5mm (3/8")
12.7mm (1/2")
Annealed (O) ≥0.8mm
t
Ø
15.9mm (5/8") Annealed (O) ≥1.0mm
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 Diameter
L1 (pair, twin, triple, double twin) See below.
L2,L3 (twin)
L2~L4 (triple)
L4~L7 (double twin)
Use the same diameters as the
connections (liquid, gas) on the
indoor units.
L2,L3 (double twin) Liquid piping: Ø9.5mm
Gas piping: Ø22.2mm
L1 (pair, twin, triple, double twin):
Model New
(a)
/
Existing
(b)
L1 liquid
piping
L1 gas piping
RZA200+250D7 Standard Ø9.5mm Ø22.2mm
Size‑up Ø12.7mm Ø25.4mm
(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.
Refrigerant piping length and height difference
The piping lengths and height differences must comply with the following requirements:
Requirement Limit
1 Minimum total one‑way piping length Pair: Limit≤L1
Twin: Limit≤L1+L3
Triple: Limit≤L1+L4
Double twin: Limit≤L1+L3+L7
5m
(a)
2 Maximum total piping length Pair: L1≤limit
Twin: L1+L2+L3≤limit
Triple: L1+L2+L3+L4≤limit
Double twin:
L1+L2+L3+L4+L5+L6+L7≤limit
Ø standard 100m
Ø size-up gas pipe 100m
Ø size-up liquid pipe 50m
3 Maximum branch piping length Twin and triple: L2≤limit 20m
Double twin: L2+L4≤limit