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Example 2
L1=5 (Ø9.5)
125 type
outdoor heat pump
1
G1=L1=5 m
30
2
Over
m
a
G1=5 m
b (G1+G2)
–
30=(5+44)
3
Refrigerant charge amount=R=R1+R2=0.0+0.6=0.6 kg
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.
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
page
6. (E.g. twin: L1+L2).
Table 3: Total charging amount <unit: kg>
Liquid pipe
Model
size
RZQS71
standard
RZQS100+125
standard
Precaution for pumping-down operation
The outdoor unit is equipped with a low pressure switch or a low
pressure sensor to protect the compressor.
Never short-circuit the low pressure switch or low pressure
sensor during pump-down operation.
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.
RZQS71~125B7V3B
Split System air conditioners
4PW32097-1A
L2=7 (Ø6.4)
50 type
indoor
L3=17 (Ø6.4)
50 type
indoor
L4=20 (Ø6.4)
50 type
G2=L2+L3+L4=7+17+20=44
R1=0.0 kg
–
30=19
Ø6.4 R2=0.6 kg
of the table in
Refrigerant piping length
1.8
2.3
2.8
3.3
3.8
4.3
4.8
Pump down operation
Procedure
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.
3
Once operation stops after 3 or 5
(a)
minutes
, close the stop valve on
the liquid side and gas side
securely. (See
shut-off valve" on page
4
Turn off the power supply.
(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.
•
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
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.
E
LECTRICAL WIRING WORK
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.
High voltage
To avoid electrical shock, make sure to disconnect the
power supply 1 minute or more before servicing the
electrical parts. Even after 1 minute, always measure
the voltage at the terminals of main circuit capacitors
or electrical parts and, before touching, make sure
that those voltages are 50 V DC or less.
—
5.3
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.)
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.
Precaution
—
Compressor and outdoor fan will
start operation automatically.
The indoor unit fan may
automatically start running.
Please pay attention to this.
Never leave the outdoor unit
unattended with opened front
panel when power supply is on.
"How to use the
7)
"Preliminary measures" on
Installation manual
10
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