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5 Preparation
Installer reference guide
11
RZAG71~Y1
Sky Air Alpha-series
4P486046-1A – 2017.08
Piping
Diameter
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
—
Model
New
(a)
/
Existing
(b)
L1 liquid
piping
L1 gas piping
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
5 Maximum difference between branch
lengths
Pair: N/A
—
Twin: L2–L3≤Limit
10 m
Triple: L2–L4≤Limit
—
10 m
Double twin:
▪ L2–L3≤Limit
▪ L4–L5≤Limit
▪ L6–L7≤Limit
▪ (L2+L4)–(L3+L7)≤Limit
—
10 m
6 Maximum height between indoor and
outdoor
Pair, twin, triple and double twin: H1≤Limit
30 m
7 Maximum height between indoors
Pair: N/A
Twin, triple and double twin: H2≤Limit
0.5 m
(a)
Parenthesised figure represents the equivalent length.
Example