RZQ71~125B7V3B
Split System air conditioners
4PW16864-1A
Installation manual
10
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"
paragraph
"Allowable pipe length and height difference" on
. (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 to protect the
compressor.
Take the following steps to perform the pumping-down operation.
This is the end of pumping-down operation. After pumping-down
operation, the remote controller can show the following pattern:
-
"U4"
-
blank screen
-
indoor fan operates for about 30 seconds
even when ON button on the remote controller is pressed, and it will
not operate. Turn off the main power supply switch and turn it on
again in need of operation.
E
LECTRICAL
WIRING
WORK
Precautions on electrical wiring work
■
Before obtaining access to terminal devices, all supply circuits
must be interrupted.
■
Use only copper wires.
■
The wiring between the indoor unit and outdoor unit must be for
230 V.
■
Do not turn on the main switch until all the wiring is completed.
Make sure that the main switch has a contact separation of at
least 3 mm in all poles.
■
Never squeeze bundled cables into a unit.
■
Fix cables so that cables do not make contact with the pipes
(especially on high pressure side).
■
Secure the electrical wiring with clamping material as shown in
the figure below so that it does not come in contact with the
piping, particulary on the high-pressure side.
Make sure no external pressure is applied to the terminal
connectors.
■
When installing the earth leak detector make sure that it is
compatible with the inverter (resistant to high frequency
electrical noise) to avoid unnecessary opening of the earth leak
detector.
■
As this unit is equipped with an inverter, installing a phase
advancing capacitor not only will deteriorate power factor
improvement effect, but also may cause capacitor abnormal
heating accident due to high-frequency waves. Therefore, never
install a phase advancing capacitor.
Secure the wiring in the order shown below.
1
Secure the ground wire to the shut-off valve attachment plate so
that it does not slide.
2
Secure the ground wire to the shut-off valve attachment plate
one more time along with the electric wiring and the inter-unit
wiring.
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
125
Main
1.5
2.0
RZQ71~125
Branch
6.4
0.33
0.6
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
2.2
2.2
—
standard
2.2
2.2
2.7
3.2
3.7
4.2
—
125
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
2.7
2.7
3.2
3.7
4.2
—
125
3.8
3.8
4.3
4.8
5.3
5.8
6.3
Never short-circuit the low pressure switch in this
operation.
Procedure
Precaution
1
Start the fan operation with the
remote controller.
Confirm that stop valves both on
the liquid and gas side are open.
2
Push the pumping-down button on
the PC board of the outdoor unit.
Compressor and outdoor fan will
start operation automatically.
If step 2 is performed before step
1, then the indoor 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 securely. (See
to use the shut-off valve" on
page 7
—
■
All wiring must be performed by an authorized
electrician.
■
All components procured on the site and all electric
construction should comply with the applicable local
and national codes.
To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. (Running it before the piping is ready will break
the compressor.)
