6 Installation
Installer reference guide
20
RZAG71~Y1
Sky Air Alpha-series
4P486046-1A – 2017.08
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Do NOT use cleaning materials or means to accelerate
the defrosting process other than those recommended
by the manufacturer.
▪ Be aware that the refrigerant inside the system is
odourless.
WARNING
The refrigerant inside the unit is mildly flammable, but
normally does not leak. If the refrigerant leaks in the room
and comes in contact with fire from a burner, a heater, or a
cooker, this may result in fire, or the formation of a harmful
gas.
Turn off any combustible heating devices, ventilate the
room, and contact the dealer from which you purchased
the unit.
Do not use the unit until a service person confirms that the
portion from which the refrigerant leaked is repaired.
6.6.3
Precautions when charging refrigerant
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
6.6.4
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
6.6.5
To determine the additional refrigerant
amount
To determine if adding additional refrigerant is necessary
If
Then
(L1+L2+L3+L4+L5+L6+L7)≤
chargeless length
Chargeless length=
▪ 10 m (size‑down)
▪ 40 m (standard)
▪ 15 m (size‑up)
You do not have to add
additional refrigerant.
(L1+L2+L3+L4+L5+L6+L7)>
chargeless length
You must add additional
refrigerant.
For future servicing, encircle the
selected amount in the tables
below.
INFORMATION
Piping length is the largest one way length of liquid piping.
To determine the additional refrigerant amount (R in kg) (in
case of pair)
Standard piping size:
L1 (m)
L1 (standard): 40~50 m 50~55 m 55~60 m
(a)
60~75 m
(a)
75~85 m
(a)
R:
0.35 kg
0.7 kg
(a)
0.55 kg
(b)
0.7 kg
1.05 kg
1.55 kg
(a)
Only for RZAG100~140.
(b)
Only for RZAG71.
Size-up piping size:
L1 (m)
L1 (size-up):
15~20 m
20~25 m
25~30 m
(a)
30~35 m
(a)
R:
0.35 kg
0.7 kg
1.05 kg
1.4 kg
(a)
Only for RZAG100~140.
To determine the additional refrigerant amount (R in kg) (in
case of twin, triple and double twin)
1
Determine G1 and G2.
G1 (m)
Total length of <x> liquid piping
x=
Ø9.5 mm
(standard)
x=
Ø12.7 mm
(size‑up)
G2 (m)
Total length of
Ø6.4
mm liquid piping
2
Determine R1 and R2.
If
Then
G1>40 m
(a)
Use the table below to determine
R1 (length=
G1−40 m
)
(a)
and R2
(length=
G2
).
G1≤40 m
(a)
(and G1+G2>40 m)
(a)
R1=0.0 kg.
Use the table below to determine
R2 (length=
G1+G2−40 m
)
(a)
.
(a)
In case of size‑up: Replace 40 m by 15 m.
In case of
standard
liquid pipe size:
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