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Preparation
Installer reference guide
31
RZAG71~Y1
Sky Air Alpha-series
4P695307-1 – 2022.05
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)
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