RZQ71~12 RZQ100~140B7W1B
Split System air conditioners
4PW21412-1A
Installation manual
10
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
Total charging weight of the refrigerant (after a leak,
etc.)
■
The total charging amounts relate to the refrigerant piping length
as in
"Maximum allowable piping length"
of the table in
paragraph
"Allowable pipe length and height difference" on
page 5
. (E.g. twin: L1+L2).
Table 3: Total charging amount <unit: kg>
Precaution for pumping-down operation
The outdoor unit is equipped with a low pressure switch or a low
pressure sensor to protect the compressor.
Take the following steps to perform the pumping-down operation.
■
Preliminary measures
•
Make sure to cut off power supply.
Open the front panel and cover the PCB and terminal board with
insulation sheet to avoid electric shock by accidental touching of
live parts.
•
Close the front panel before leaving the outdoor unit. You cannot
leave the unit unattended in case the front panel remains opened.
•
Turn on the power supply and carry out pumping-down operation
according to the following procedure.
■
Pump down operation
(†) If after finishing pumping-down operation the outdoor unit does
not operate, not even when the remote controller switch is turned on,
the remote controller may or may not indicate “U4”. But this is not a
malfunction.
•
After finishing the pumping-down operation, make sure to have
removed the insulation sheet that was placed in the switch box as
a protective measure like in chapter
"Preliminary measures" on
page 10
.
•
When in need of operation, turn off the main power supply and
turn it on again. Make sure that stop valves both on liquid and gas
side are open and be sure to operate the unit in cooling operation
during test run.
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
Refrigerant piping length
Model
Liquid pipe
size
3~5
(*)
m
5~10 m
10~20 m
20~30 m
30~40 m
40~50 m
50~60 m
60~75 m
RZQ71
size-down
1.8
1.8
—
standard
1.8
1.8
2.3
2.8
3.3
3.8
—
RZQ100~140
size-down
3.3
3.3
—
standard
3.3
3.3
3.8
4.3
4.8
5.3
5.8
6.3
Refrigerant piping length
Model
Liquid pipe
size
3~5
(*)
m
(*)
When piping length is less than 5 m, a complete recharging of the unit is required.
Charge the unit with the refrigerant charge as indicated.
5~10 m
10~15 m
15~20 m
20~25 m
25~30 m
30~35 m
RZQ71
size-up
2.3
2.3
2.8
3.3
3.8
—
RZQ100~140
3.8
3.8
4.3
4.8
5.3
5.8
6.3
Never short-circuit the low pressure switch or low pressure
sensor during pump-down operation.
Procedure
Precaution
1
Make sure that stop valves both on
liquid and on gas side are open.
—
2
Push the pumping-down operation
button on the PC board of the
outdoor unit.
Compressor and outdoor fan will
start operation automatically.
The indoor unit fan may
automatically start running.
Please pay attention to this.
3
Once operation stops after 3 or 5
minutes
(†)
, close the stop valve on
the liquid side and gas side
securely. (See
"How to use the
shut-off valve" on page 7
)
Never leave the outdoor unit
unattended with opened front
panel when power supply is on.
4
Turn off the power supply.
