Installation manual
15
RZQG71~140L + RZQSG100~140L
Split system air conditioners
4P339538-1A – 2014.03
12.4. Complete recharging
In case complete recharging is required (after a leak, etc.), refer to
the information below to determine the necessary amount of
refrigerant.
12.5. Total charging weight of the refrigerant
(after a leak, etc.)
The total charging amounts relate to the refrigerant piping length as
in "Maximum total one-way piping length" of the table in paragraph
"8.4. Allowable pipe length and height difference" on page 8
. (E.g. twin:
L1+L2).
Table 3:
Total charging amount <unit: kg>
13. Pump down operation
This unit is equipped with an automatic pump down operation which
will collect all refrigerant from the field piping and indoor unit in the
outdoor unit. To protect the environment, make sure to perform the
following pump down operation when relocating or disposing of the
unit.
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.
NOTICE
Before recharging, make sure to execute vacuum drying of
the internal piping of the unit as well. To do so, use the
internal service port of the unit. Do NOT use the service
ports located on the stop valve (see
"9.3. Stop valve
operation" on page 10
), since vacuum drying can not be
performed properly from these ports.
Outdoor units have 1 port on the piping. It is between the
heat exchanger and the 4-way valve.
WARNING
Some sections of the refrigerant circuit may be isolated
from other sections caused by components with specific
functions (e.g. valves). The refrigerant circuit therefore
features additional service ports for vacuuming, pressure
relief or pressurizing the circuit.
In case it is required to perform
brazing
on the unit, ensure
that there is no pressure remaining inside the unit. Internal
pressures need to be released with ALL the service ports
indicated on the figures below opened. The location is
depending on mode type.
RZQG71/RZQSG100~125
RZQG100~140/RZQSG140
Model
Liquid
piping
Refrigerant piping length
5~
10
m
(a)
(b
)
(a) For RZQG units only: 3~10 m.
(b) For RZQG units only: 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.
10
~20 m
20
~30 m
30
~40 m
40
~50 m
50
~60 m
60
~75 m
RZQG71
size-down
1.9
—
—
—
—
—
—
standard
1.9
2.4
2.9
3.4
3.9
—
—
RZQG100~140
size-down
3.0
—
—
—
—
—
—
standard
3.0
3.5
4.0
4.5
5.0
5.5
6.0
R125
size-down
1.9
—
—
—
—
—
—
standard
1.9
2.4
2.9
3.4
3.9
—
—
RZQSG140
size-down
3.0
—
—
—
—
—
—
standard
3.0
3.5
4.0
4.5
5.0
—
—
Model
Liquid
piping
Refrigerant piping length
3~5
m
(a)
(a) 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
RZQG71
size-up
1.9
2.4
2.9
3.4
3.9
—
—
RZQG100~140
size-up
3.0
3.5
4.0
4.5
5.0
5.5
6.0
R125
size-up
—
2.4
2.9
3.4
3.9
—
—
RZQSG140
size-up
—
3.5
4.0
4.5
5.0
—
—
INFORMATION
For more details, refer to the applicable service manual.
Procedure
Precaution
1
Make sure that stop valves both
on liquid and on gas side are
open.
—
2
Push the BS4 pumping-down
operation button on the PC board
of the outdoor unit (±8 seconds).
Compressor and outdoor fan will
start operation automatically.
The indoor unit fan may
automatically start running.
Please pay attention to this.
3
Close the stop valve on the liquid
side securely about 2 minutes
after the compressor started
operation. (See
"9.3. Stop valve
operation" on page 10
.)
Never leave the outdoor unit
unattended with opened front
panel when power supply is on.
In case the stop valve on the
liquid side is not securely closed
during compressor operation,
pumping-down operation cannot
be executed.
4
Once compressor operation stops
after 2 to 5 minutes
(a)
, close the
stop valve on the gas side
securely. (See
"9.3. Stop valve
operation" on page 10
.)
(a) 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.
5
Turn off the power supply.
WARNING
Make sure to re-open both stop valves before restarting
operation of the unit.
