RR+RQ71+10 RR+RQ71~125B7W1B
Split System air conditioners
4PW19370-1C
Installation manual
8
E
VACUATING
■
Do not purge the air with refrigerants. Use a vacuum pump to
vacuum the installation. No additional refrigerant is provided for
air purging.
■
Pipes inside the units were checked for leaks by the
manufacturer. The refrigerant pipes fit on site are to be checked
for leaks by the installer.
■
Confirm that the valves are firmly closed before leak test or
vacuuming.
Set up for vacuuming and leak test:
see
figure 7
Procedure for leak test
Leak test must satisfy EN378-2.
C
HARGING
REFRIGERANT
Precaution for servicing
This unit requires additional charging of refrigerant according to the
length of piping 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.
Additional charging of refrigerant
■
Over 30 m please, add refrigerant quantity according to following
tables.
For future servicing, mark with a circle the selected amount on the
tables below
For pair system
Additional charging amount <unit: kg>
For twin/triple system
Please charge additionaly according to the following calculation.
1
Calculate the total length (L) of all liquid piping in the system.
Twin
(See figure 3)
: L=L1+L2+L3
Triple
(See figure 4)
: L=L1+L2+L3+L4
■
In case L<30 meter: no additional charging is required
■
In case L>30 meter calculate:
1. Calculate G1:
Calculate total length of Ø9.5
mm liquid piping (main
branch piping)
2. Calculate G2:
Calculate total length of Ø6.4 mm liquid piping (branch piping)
3. In case G1>30 meter, proceed to step 2
In case G1<30 meter, proceed to step 3
2
Calculate length G1 over 30 meter (G1–30 m)
Based on this length, decide R1 from the table below
Based on G2, decide R2 from the table below.
Proceed to step 4
3
Calculate total length over 30 meter (G1+G2–30 m)
Based on this length, decide R2 from the table below
R1=0 meter
Length <unit: m>, additional charge amount <unit: kg>
4
The total additional charge amount R=R1+R2 (kg)
A
Pair system
B
Simultaneous operation system
1
Pressure gauge
2
Nitrogen
3
Refrigerant
4
Weighing machine
5
Vacuum pump
6
Stop valve
7
Main pipe
8
Branched pipes
9
Pipe branching kit (optional)
1
Evacuate the pipes and check vacuum
(1)
. (No pressure
increase for 1 minute.)
(1) Use a 2-stage vacuum pump with a non return valve which
can evacuate to –100.7 kPa (5 Torr, –755 mm Hg).
Evacuate the system from the liquid and gas pipes by using
a vacuum pump for more than 2 hours and bring the system
to –100.7 kPa. After keeping the system under that condition
for more than one hour, check if the vacuum gauge rises or
not. If it rises, the system may either contain moisture inside
or have leaks.
2
Break the vacuum with a minimum of 2 bar of nitrogen. (Never
pressurize more than 4.15 MPa.)
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
(1)
.
6
If vacuum gauge does no longer rise, the stop valves can be
opened.
NOTE
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.
After air purging with a vacuum pump it may happen that
the refrigerant pressure does not rise, not even if the stop
valve is opened. Reason for this phenomenon is the closed
state of for instance the expansion valve in the outdoor unit
circuit, but this is not a problem for running the unit.
When performing service on the unit requiring the
refrigerant system to be opened, refrigerant must be
evacuated according to local regulations.
NOTE
On twin/triple application, piping length means sum of
main pipe and branch pipe.
Piping length is the 1 way length, gas or liquid.
Connected piping length is between
Class
30-40 m
40-50 m
50-60 m
60-70 m
H/P
71-100-125
+0.50
+1.00
+1.50
+2.00
C/O
71-100-125
+0.25
+0.50
+0.75
+1.00
Ø
Length exceeding 30 m
Class
0-10
10-20
20-30
30-40
40-50
H/P 71-100-125
9.5
0.50
1.00
1.50
2.00
2.50
R1
6.4
0.30
0.60
0.90
1.20
1.50
R2
C/O 71-100-125
9.5
0.25
0.50
0.75
1.00
1.25
R1
6.4
0.15
0.30
0.45
0.60
0.75
R2
