Installation manual
9
RZQ71~125B7V3B
Split System air conditioners
4PW16864-1A
3
Conduct leak test by applying soap water, etc. to the connecting
part of the pipes.
4
Discharge nitrogen.
5
Evacuate and check vacuum again
6
If the vacuum gauge no longer rises, the stop valves can be
opened.
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. Since R-410A 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
Following should be executed if there is a possibility of
moisture remaining in the pipe (if piping work is carried out
during the raining season or over a long period of time,
rainwater may enter the pipe during work).
After evacuating the system for 2 hours, pressurize the
system to 0.05 MPa (vacuum break) with nitrogen gas and
evacuate the system again using the vacuum pump for
1 hour to –100.7 kPa (vacuum drying). If the system
cannot be evacuated to –100.7 kPa within 2 hours, repeat
the operation of vacuum break and vacuum drying. Then
after leaving the system in vacuum for 1 hour, confirm that
the vacuum gauge does not rise.
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
—
125
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
—
125
1.5
2.0
Liquid
piping
Ø
Length exceeding “Chargeless length”
Model
0~10
10~20
20~30
30~40
40~55
RZQ71~125
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.
