RZQ71~12 RZQ100~140B8W1B
Split System air conditioners
4PW23691-1A
Installation manual
10
C
HARGING
REFRIGERANT
Precaution for servicing
This unit requires additional charging of refrigerant according to the
length of pipe connected at the site. Charge the refrigerant to the
liquid pipe in its liquid state through the service port of the liquid stop
valve. Since R410A is a mixed refrigerant, its composition changes if
charged in a state of gas and normal system operation would no
longer be assured.
On this model it is not necessary to charge additionaly if the piping
length
≤
30 m.
<5 m: See
"Total charging weight of the refrigerant (after a leak, etc.)"
.
Additional charging of refrigerant
■
The additional charging amounts relate to the refrigerant piping
length as in
"Maximum total one-way piping length"
in paragraph
"Allowable pipe length and height difference" on
. (E.g. twin: L1+L2+L3).
■
Over 30
m, please add refrigerant quantity according to
following table.
For future servicing, mark with a circle the selected amount on the
tables below
For pair system
Table 1: Additional charging of refrigerant <unit: kg>
For twin, triple, and double twin system
Please charge additionaly according to the following calculation.
(additional amount is R1+R2)
1.
G1: total length of
Ø
9.5 mm liquid piping
G2: total length of
Ø
6.4 mm liquid piping
2.a G1>30 m
calculate length over 30 m (=G1–30 m)
Based on this length decide R1, R2 in the table
b G1
≤
30 m and G1+G2>30 m
calculate total length over
30
m (=G1+G2–30 m)
Based on this decide R2 in the table, R1=0
3.
Total additional charge amount
R=R1+R2 (kg)
Table 2: Length <unit: m>, additional charging of refrigerant
<unit: kg>
Example 1
1
G1=L1=35 m
G2=L2+L3=7+5=12
2
Over
30
m
a
G1
–
30=5 m
➙
Ø9.5 R1=0.5 kg
b
G2=12 m
➙
Ø6.4 R2=0.6 kg
3
Refrigerant charge amount=R=R1+R2=0.5+0.6=1.1 kg
Example 2
1
G1=L1=5 m
G2=L2+L3+L4=17+17+20=54
2
Over
30
m
a
G1=5 m
➙
R1=0.0 kg
b
(G1+G2)
–
30=(5+54)
–
30=29
➙
Ø6.4 R2=0.9 kg
3
Refrigerant charge amount=R=R1+R2=0.0+0.9=0.9 kg
When performing service on the unit requiring the
refrigerant system to be opened, refrigerant must be
evacuated according to local regulations.
Standard liquid pipe size
Connected piping length is between
Model
30~40 m
40~50 m
50~60 m
60~75 m
RZQ71
0.5
1.0
—
RZQ100~140
1.5
2.0
Size up liquid pipe size
Connected piping length is between
Model
15~20 m
20~25 m
25~30 m
30~35 m
RZQ71
0.5
1.0
—
RZQ100~140
1.5
2.0
Liquid
piping
Ø
Length exceeding “Chargeless length”
Model
0~10
10~20
20~30
30~40
40~55
RZQ71~140
Main
9.5
0.5
1.0
1.5
2.0
2.5
R1
Branch
Branch
6.4
0.3
0.6
0.9
1.2
1.5
R2
L2=7 (Ø6.4)
50 type
100 type
L1=35 (Ø9.5)
indoor
L3=5 (Ø6.4)
50 type
outdoor heat pump
L2=17 (Ø6.4)
50 type
indoor
125 type
L1=5 (Ø9.5)
L3=17 (Ø6.4)
50 type
outdoor heat pump
indoor
L4=20 (Ø6.4)
50 type
In case of complete recharge of the refrigerant, please first
execute vacuuming. Execute this vacuuming from the
service port. Do not use the port of the stop valve for
vacuuming. Vacuuming can not be executed completely
using such port.
Position of service port:
Heat pump: Heat pump units have 2 ports on the
piping. One between the liquid receiver and the
electronic expansion valve and another one between
the heat exchanger and the 4-way valve.
Systems with sized-up liquid pipe
■
Replace 30 m by 15 m in calculations above and use
the table below.
■
G1: total length of Ø12.7 mm liquid piping.
Length exceeding
“Chargeless length”
Model
Liquid
piping
Ø
0~5 m
5~10 m
10~15 m
15~20 m
RZQ71
Main
12.7
0.5
1.0
—
—
R1
RZQ100~140
Main
1.5
2.0
RZQ71~140
Branch
6.4
0.3
0.6
R2
RZQ140
Branch
9.5
0.5
1.0
R2
