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13. P
UMP DOWN OPERATION
In order to protect the environment, be sure to pump down when
relocating or disposing of the unit. The pump down operation will
extract all refrigerant from the piping into the outdoor unit.
13.1. Pump down procedure
1
Remove the valve lid from liquid stop valve and gas stop valve.
2
Carry out the forced cooling operation.
3
After 5 to 10 minutes (after only 1 or 2 minutes in case of very
low ambient temperatures (<–10°C)), close the liquid stop valve
with a hexagonal wrench.
4
After 2-3 minutes, close the gas stop valve and stop forced
cooling operation.
1 Gas stop valve
2 Close
3 Hexagonal wrench
4 Valve lid
5 Liquid stop valve
13.2. Forced cooling operation
1
Press the forced operation switch SW1 to begin forced cooling.
2
Press the forced operation switch SW1 again to stop forced
cooling.
S102
S2
LED-A
SW4
SW1
1 Forced operation switch SW1
NOTICE
Take care that while running forced cooling operation the
water temperature remains higher than 5°C (see
temperature read out of the indoor unit). You can achieve
this, for example, by activating all fans of the fan coil units.
Installation manual
12
2
1
5
1
14. E
LECTRICAL WIRING WORK
WARNING
All wiring must be performed by an authorized
electrician.
Electrical connections shall be made to fixed wiring.
All components procured on the site and all electric
construction
legislation.
DANGER: 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.
NOTICE
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
4
the compressor.)
4
14.1. Precautions on electrical wiring work
DANGER
Before obtaining access to terminal devices, all
supply circuits must be interrupted.
Be sure to install an earth leakage circuit breaker in
accordance with applicable legislation. Failure to do
so may cause electrical shock.
Do not turn on the main switch until all the wiring is
completed.
Use only copper wires.
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 applicable legislation.
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 cable ties as shown in the figure
in chapter
"14.3. Connecting power supply and interunit wiring"
on page 13
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 circuit breaker make sure that
it is compatible with the inverter (resistant to high frequency
electrical noise) to avoid unnecessary opening of the earth
leakage circuit breaker.
The power supply cable and circuit breaker must be selected in
accordance with applicale legislation.
Do not use tapped wires, stranded conductor wires (see caution
1 under
"Notes to observe" on page
connections from a star system, as they may cause overheating,
electrical shock or fire.
Do not use locally purchased electrical parts inside the product
and do not branch the power for the heater tape, etc., from the
terminal block. Doing this may cause electrical shock or fire.
shall
comply
with
the
applicable
14), extension cords, or
ERLQ006~008BBV39
Outdoor unit for air to water heat pump
4PW68003-1A – 03.2011
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