Daikin Sky Air Alpha Series - Page 11

Preparation
Installer reference guide
11
RZAG71~140N7V1+Y1
Sky Air Alpha-series
4P573381-1 – 2019.04
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.
▪ Flare connections: Only use annealed material.
▪ 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
19.1mm (3/4") 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: Ø15.9mm
L1 (pair, twin, triple, double twin):
Model New
(a)
/
Existing
(b)
L1 liquid
piping
L1 gas piping
RZAG71 Size‑down Ø6.4mm Ø12.7mm
Standard Ø9.5mm Ø15.9mm
Size‑up Ø12.7mm —
RZAG100~140 Size‑down Ø6.4mm —
Standard Ø9.5mm Ø15.9mm
Size‑up Ø12.7mm Ø19.1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 or
size‑down 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
71 100 125+140
1 Minimum total one‑way piping length Pair: Limit≤L1
Twin: Limit≤L1+L3
Triple: Limit≤L1+L4
Double twin: Limit≤L1+L3+L7
3m
2 Maximum total one‑way piping length Pair: L1≤Limit Ø size-down 10m (10m)
(a)
Ø standard 55m (75m)
(a)
85m (100m)
(a)
Ø size-up 25m (35m)
(a)
35m (45m)
(a)
Twin and triple:
L1+L2≤Limit
Double twin:
L1+L2+L4≤Limit
Ø size-down 10m (15m)
(a)
Ø standard 55m (75m)
(a)
85m (100m)
(a)
Ø size-up 25m (35m)
(a)
35m (45m)
(a)
3 Maximum allowable piping length Pair: N/A —
Twin: L1+L2+L3≤Limit 65m 85m
Triple: L1+L2+L3+L4≤Limit — 85m
Double twin: L1+L2+L3+L4+L5+L6+L7≤Limit — 85m
4 Maximum branch piping length Pair: N/A 10m
Twin and triple: L2≤Limit
Double twin: L2+L4≤Limit
20m