Freecooling Duct Connections (Optional); Positioning The Motor Condensing Unit; Refrigeration Connections - Liebert HIROSS Hisp SE Serie Manual De Usuario/ Instalacion

2.3 --- Freecooling duct connections
The air conditioner
may be supplied with
an integrated Freecool-
ing device (optional),
which uses fresh air
from outside to cool the
ambient without start-
ing up the compressor.
The device supplies the
correct cooling capac-
ity required, through a
modulating motor
damper.
In this case, the back
side of the unit is
equipped with connec-
tions which collect the
outside air, as follows:
S standard: double
circular hole, for
202 (SE
04--- 05--- 06) or 252
(SE 08--- 10--- 13--- 14) mm diameter flexible ducts to
be fixed with metal clamps (optional).
S option: single rectangular hole with flange for 560
x 190 (SE 04--- 05--- 06) or 600 x250 (SE
08--- 10--- 13--- 14) mm duct (not supplied by us).
In both cases, the holes in the wall have to be protected
by rainproof grilles with prefilter (optional), to avoid
water or foreign bodies get in the conditioner.
Fig. D --- External inspectable rainproof grille with prefilter
Outside air, taken into the room by the fan, gets out
through an overpressure damper, which is installed on
the walls of the room (optional) and is protected also
by an external rainproof grille.
Fig. E --- Internal overpressure damper with outside ---oriented fin
openings and its outside external waterproof protection grille.
IMPORTANT: The Freecooling damper is locked by
screws, to avoid damages during the transport. Re-
move the screws before starting--- up the air condition-
er (see warning label on the rear side of the SE unit).
Outer temperature probe installation
Install the outer air temperature probe arranged in-
side the electric board, at the end of the channel duct.
IMPORTANT: the bulb must be positioned as much
outside as possible and must not be exposed to direct
sun rays or weather agents such as rain or snow. The
unit operation could be jeopardized if these precau-
tions are not applied.
(optional)
Fig. C --- Freecooling ducts
3

2.4 --- Positioning the motor condensing unit

S The condensing unit must be positioned outside to
enable its cooling (see Fig. 3).
S It is connected to the air conditioner through the
refrigerating lines. Keep refrigerating lines as short
as possible (do not use lines longer than 15 m for
R22 and 10 m for R407C).
S To allow for sufficient air flow through the condens-
ing unit and enough servicing room, the Service
Area has to be left unobstructed, as shown in Fig. 5.
S Install the condensing unit far from polluting
agents (eg. dust, leaves) to ensure the longest effi-
ciency of the unit.
If several locations are available, preferably install
the motor--- condensing unit in the place with most
reduced direct sun exposure, so as to optimize the
performance, and with a suitable air circulation.
Make sure the unit cannot be completely covered
by possible snow. Do not obstruct the air suction
and ejection sections. Position the unit so that the
ejected hot air and the sound emission cannot dis-
turb people.
If the motor--- condensing unit is positioned on the
top of building, or on walls exposed to strong winds,
provide for a stable fastening, if necessary with
additional supports or tie--- rods. The wind direc-
tion shall be perpendicular to the flow of ejected
air. The fastening stability shall be ensured also in
case of earthquakes.
S Fig. 3 shows some examples of how to install the
motor condensing unit.
In case of wall installation, preferably use the op-
tional fastening kit supplied with the unit, com-
posed for each motor--- condensing unit by a pair of
shelves in galvanized steel, painted with polyester
powders in colour RAL 9002 and with smooth fin-
ishing, suitable elastomer vibration--- damping sup-
ports, connection pairs in stainless steels including
screw anchors for the wall fastening (see Fig. 4).
NOTE: the screw anchors included in the kit are to
be used only when fastening the shelves on con-
crete or brick wall (hollow bricks, too). Do not use
on sandwich walls (e.g. container) or with unknown
composition. In these cases the most suitable
fastening system for the special material shall be
used.
If the above mentioned optional kit is not used,
suitable vibration--- damping supports shall anyway
be used between the motor--- condensing unit and
the shelves, so as to avoid the vibration diffusion.
Also make sure that the used shelves are suitable
for supporting the motor--- condensing unit in
safety conditions (e.g. in case of temporary abnor-
mal loads on the unit).

2.5 --- Refrigeration connections

THIS OPERATION MUST BE CARRIED OUT BY
AN EXPERT TECHNICIAN.
The condensing and ambient units have to be charged
with refrigerant and they are precharged with nitrogen
(see Chap. 6 --- R22 units refrigerating charge, or
Chap. 7 --- R407C units refrigerating charge).
a) Lines positioning (Fig. 9)
Connect the air conditioner to the condensing unit by
using refrigerating lines in hard or soft copper.
S Limit the number of preshaped bends; if this is not
possible, every bend must have a radius of at least
100 mm.
S The gas line must be insulated.
English