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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 open.
•
Turn on the power supply and carry out pumping-down operation
according to the following procedure.
Pump down operation
Procedure
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).
3
Close the stop valve on the
liquid side securely about 2
minutes after the compressor
started operation. (See
to use the stop valve" on
page
7)
4
Once compressor operation
stops after 2 to 5 minutes
close the stop valve on the
gas side securely. (See
to use the stop valve" on
page
7)
5
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 "
•
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 as in chapter
"Preliminary measures" on page
•
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.
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
"How
on.
In case the stop valve on the
liquid side is not securely
closed during compressor
operation, pumping-down
(a)
,
operation cannot be executed.
"How
U4
". But this is not a malfunction.
10.
Electrical wiring work
All field wiring and components must be installed by a
licensed electrician and must comply with relevant
European and national regulations.
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.
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
220~240 V.
A main switch or other means for disconnection, having a
contact separation in all poles, must be incorporated in the fixed
wiring in accordance with relevant local and national legislation.
Do not turn on the main switch until all the wiring is completed.
For W1
Make sure to connect power supply cables in normal phase. If
connected in reverse phase, the remote controller of the indoor
U1
unit indicates "
" and the equipment cannot operate. Change
any two of the three power supply cables (L1, L2, L3) to correct
phase.
If the contact in the magnetic switch should be forcibly turned on
while the equipment is inoperative, the compressor will burn out.
Never try to forcibly turn on the contact.
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, particularly on the high-pressure side.
Make sure no external pressure is applied to the terminal
connectors.
When installing the earth leakage breaker make sure that it is
compatible with the inverter (resistant to high frequency
electrical noise) to avoid unnecessary opening of the earth
leakage breaker.
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.
Installation manual
10
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