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Installation
Installer reference guide
21
RZAG71~Y1
Sky Air Alpha-series
4P573381-1 – 2019.04
H2
Height difference between the highest and the lowest
indoor unit
Refrigerant branch kit
6.6.5
Charging additional refrigerant
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: 40~50 m 50~55 m 55~60 m 60~70 m 70~80 m 80~85 m
R:
0.35 kg
0.7 kg
(a)
0.55 kg
(b)
0.7 kg
(a)
1.05 kg
(a)
1.4 kg
(a)
1.55 kg
(a)
(a)
Only for RZAG100~140.
(b)
Only for RZAG71.
Size-up piping size
L1 (m)
L1:
15~20 m
20~25 m
25~30 m
30~35 m
R:
0.35 kg
0.7 kg
1.05 kg
(a)
1.4 kg
(a)
(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:
Length
0~10 m
10~15 m 15~20 m 20~30 m 30~40 m 40~45 m
R1:
0.35 kg
0.7 kg
(a)
0.55 kg
(b)
0.7 kg
(a)
1.05 kg
(a)
1.4 kg
(a)
1.55 kg
(a)
R2:
0.2 kg
0.4 kg
0.4 kg
0.6 kg
0.8 kg
(a)
1 kg
(a)
(a)
Only for RZAG100~140.
(b)
Only for RZAG71.
In case of
size‑up
liquid pipe size:
Length
0~5
m
5~10
m
10~15
m
15~20
m
20~30
m
30~40
m
40~45
m
R1:
0.35 kg 0.7 kg 1.05 kg
(a)
1.4 kg
(a)
—
—
—
R2:
0.35 kg
0.7 kg
(a)
1.05 kg
(a)
1.4 kg
(a)
—
(a)
Only for RZAG100~140.
3
Determine the additional refrigerant amount: R=R1+R2.
Examples
Layout
Additional refrigerant amount (R)
L2=7 m
(Ø6.4 mm)
L3=5 m
(Ø6.4 mm)
L1=45 m (Ø9.5 mm)
RZAG100
Case: Twin, standard liquid pipe size
1 G1 Total Ø9.5
=> G1=45 m
G2 Total Ø6.4 => G2=7+5=12 m
2 Case: G1>40 m
R1 Length=G1−40 m=5 m
=> R1=0.35 kg
R2 Length=G2=12 m
=> R2=0.4 kg
3 R
R=R1+R2=0.35+0.4=0.75 kg
L2=20 m
(Ø6.4 mm)
L3=17 m
(Ø6.4 mm)
L4=17 m
(Ø6.4 mm)
L1=15 m (Ø9.5 mm)
RZAG125
Case: Triple, standard liquid pipe size
1 G1 Total Ø9.5 => G1=15 m
G2 Total Ø6.4 => G2=20+17+17=54 m
2 Case: G1≤40 m (and G1+G2>40 m)
R1 R1=0.0 kg
R2 Length=G1+G2−40 m=15+54−40=2
9 m
=> R2=0.6 kg
3 R
R=R1+R2=0.0+0.6=0.6 kg
Charging refrigerant: Setup
See
"6.5.3 Checking refrigerant piping: Setup" on page 19
.
To charge additional refrigerant
WARNING
▪ Only use R32 as refrigerant. Other substances may
cause explosions and accidents.
▪ R32 contains fluorinated greenhouse gases. Its global
warming potential (GWP) value is 675. Do NOT vent
these gases into the atmosphere.
▪ When charging refrigerant, ALWAYS use protective
gloves and safety glasses.
CAUTION
To avoid compressor breakdown, do NOT charge more
than the specified amount of refrigerant.
Prerequisite:
Before charging refrigerant, make sure the refrigerant
piping is connected and checked (leak test and vacuum drying).
1
Connect the refrigerant cylinder to both the service port of the
gas stop valve and the service port of the liquid stop valve.
2
Charge the additional refrigerant amount.
3
Open the stop valves.