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Idiomas disponibles
Idiomas disponibles
1 - General descriptions
Liebert HPD Dry Coolers are the range of liquid coolers, able to
cover rated heat exchange capacities from 8 to 400 kW. They are
equipped either with AC or EC fan. In Table 2 (pag. A2) you will find
electrical data of the motors. They excel above all for their efficien-
cy, versatility and reliability, thanks to the following features:
1.
Possibility of installation with horizontal or vertical air flow with
simple operations on site, with the same model of Dry Cooler,
without needing any wiring or re-wiring inside the unit.
2.
Modulating fan speed regulator R (optional), for a continuous
modulation of the fan speed, installed on the machine, wired
and factory-set, thus making the connection steps on site and
the unit start-up extremely easy; the fan speed regulator with
phase cutoff can be selected to control up to two set-point val-
ues for the water delivery temperature of the Dry Cooler.See
chapt. 4 and 9 for more details on the use of the fan speed reg-
ulator, already installed on the machine. Do not use fan speed
regulator other than the approved one supplied by the manu-
facturer. When the Dry Cooler is ordered without temperature
control, an outer on/off type control (to be arranged by the
customer) is anyway allowed and must be connected on site
with the suitable terminals available in the electric board Q of
the unit (see wiring diagram enclosed to the unit).
3.
The axial fans are equipped with protection grid and are stat-
ically and dynamically balanced; they can guarantee high ef-
ficiency and a low emitted noise level (above all in the low
noise version); further, they are equipped with motors able to
operate within a wide range of outdoor working temperatures.
Protection degree IP 54. Single-phase fans feature an electric
condenser incorporated in the terminal board.
4.
Tubes are in copper and fins in aluminum, with wide heat
exchange surface. Upon request (optional), the unit can be
ordered with fins in epoxy-coated aluminum, with a better pro-
tection. The coil manifolds are in copper, with flanged con-
nections in AISI 304 stainless steel, dimensions according to
UNI EN 1092-1 type 13 PN16, for the models with three-phase
power supply and male gas threaded connections for the sin-
gle-phase models.
Other main features of Dry Coolers are summed up here below:
5.
the power supply is:230 V single phase 50 Hz in the DYS mod-
els (standard noise level) and DYL models (low noise level).
400 V three-phase 50 Hz in the DYS models (standard noise
level) and DYL models (low noise level).
6.
Electrical boxes and accessories are water proof.
7.
The frame is made up of a sturdy structure in galvanized steel,
totally painted(RAL 9002).
8.
The units are equipped with protection electric board Q, with
main disconnector. Refer to chapt. 3 and 8 for more details on
the use of the Dry Cooler electric board.
9.
The most important technical data are gathered in Table a -
Enclosure A. Tests on thermal performance have been car-
ried out at IMQ laboratories, according to the norm UNI EN
1048:2000, at the following special operating conditions:
Air inlet T
Water inlet T
Water outlet T
Sound pressure levels have been evaluated according to the
norm EN13487, at a 10-m distance, with free field.
The working pressure depends on the circuit where the Dry
Cooler is connected. Dry Cooler max pressure is 16 barg).
All Dry Cooler units are CE marked.
English
= 35°C
= 45°C
= 40°C
Dry Cooler units are conform to the following directives:
•
PED97/23/CEE
•
73/23/CEE
•
EMC 89/336/CEE (EN61000-6-2; EN 61000-6-3)
•
98/37/CE
2 - Installation
2.1 - Unit shipping
The Dry Coolers are shipped in a wooden case. Follow the indica-
tion given in Enclosures B - Lifting and handling to lift the unit.
Seaworthy packing is available on request (see also Digit 9)
2.2 - Location and maintenance area
The correct location for a unit will favor an efficient heat dissipation
from the Cooler which guarantees that the unit will operate correctly
in even the most severe conditions and it enables an easy mainte-
nance (see Enclosures C).
2.3 - General tips
1.
The Dry Coolers are built to be completely weather proof. This
means that a roof or closed installation simply for protective
purposes is unnecessary and not suggested.
2.
Particular care must be taken when the unit is covered by a
roof, especially when the plant free space is limited. The fun-
damental principle for correct working of the hydraulic circuit is
to guarantee supply and adequate expulsion of air.
3.
Our equipment excludes the support accessories and/or air
intake or expulsion ducts.
The low noise Dry Coolers are particularly suitable for installation
in residential areas.
Noise can be further reduced during mid seasons and in the night
by using a speed controller which allows unit installation just a few
meters from the windows of houses or off ices, even in very quiet
areas. Anyway, refer to the norms in force in the installation place.
2.4 - Collocation
The Dry Cooler can be installed with horizontal air flow or vertical
air flow (See Enclosures D - Dimensional Drawings and Chap. 8).
2.5 - Mounting
To optimize the shipping dimensions, the Dry Coolers are packed
laid in horizontal position, the electric board and the fan speed reg-
ulator (optional) are pre-positioned in the factory for operating with
vertical air flow. To set the machine in the horizontal or vertical air
flow position, just see Enclosures D - Dimensional Drawings and
Chap. 8.
First of all, adjust the supports, using the parts (supports, bolts)
inside the package.
2.6 - Anchorage of the units
The Dry Coolers, as well as being subjected to very modest vibra-
tions due to the fans, can be exposed to the wind, especially in
installation with horizontal air flow.
It is recommended that the unit is fixed to a rigid base (provide a
concrete raised bed if it is not possible to insert foundation bolts
directly into the terrace or roof where the unit is located).
The supporting brackets have slots for bolt anchoring.
Dry Coolers
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