5
Options
5--1
Liebert HPS---PD--- 272965---20.11.2009
Emergency cooling
The unit is optionally equipped with an emergency cooling system that allows to ventilate or to
cool through external fresh air the site in case of main electrical supply fault.
For this purpose the evaporating fan section, the control, and the free cooling damper are sup-
plied in 48 VDC power supply (from rectifier in normal mode, from batteries in emergency mode).
This option guarantees the air circulation inside the site and if the control recognizes the proper
external temperature to run the freecooling mode, the damper will open to fresh the site and get
the required set point. The emergency cooling system is also available in 230 VAC.
The compressor and the condenser fan are supplied by standard AC power.
Heating
The heating option include electric heaters (1.5 kW on model 06, 3.0 kW on models 08 ---10, 4.5
kW on model 12 and 6.0 kW on model 14), located in the air discharge plenum, one stage and
ON---OFF regulation.
A safety thermostat, with manual reset, prevents from reaching dangero us temperatures.
Freecooling
The freecooling system consists of a damper controlled and moved from a AC servomotor
(48VDC supplied in the emergency version).
The system allows a 0 --- 100% modulating freecooling in order to respect the desired set point.
The exhaust air is discharged outdoor through an overpressure damper mounted on the wall and
available as accessory. The control allows the unit to run in freecooling mode when the difference
between the indoor and outdoor air temperature reaches the re quired value to get the nominal
cooling capacity. In emergency situation, the freecooling is allowed at a lower difference between
the indoor and outdoor air temperature, in order to use the external fresh air as much as possible.
In the HPSE ceiling mounted version, the innovative rotary system allows the air co nditioner to
be equipped with the freecooling system without any adding module, maintaining the standard
unit dimensions.
Connectivity
The possibility to create a LAN is available selecting the “C onnectivity” cont r ol version and con-
necting two or more units through the Hirobus cable (optional). Functions provided include
stand ---by (in case of failure or overload of the unit in operation, the second one starts automatic-
ally), automatic rotation and cascade (sharing of the total load among several units).
Special filtration
Optional high ---level filtr ation can be reached.
A clogged filter system can be supplied to advise when the indoor air filter is dirty.
Package
Standard packing consists of a wooden pallet and cardboard box. Polythene foam protects the
units’ painted surfaces. On request, a cardboard box with an additional wooden crate or wooden
case for sea transport can be supplied.
Corrosive environments protection
The condenser c oil and/or evaporator coils are available with aluminium fins coated by epoxy
film, to protect from aggressive environmental conditions.
Long piping installation
Select the “L” condenser option to allow long piping installations between outdoor and indoor
units: up to 50 m of equivalent length with up to 20 m of height level difference, being the condens-
ing unit below or above the evaporating one, doesn’t matter.
The “L” c ondenser version includes also all features provided within condenser “Advanced” ver-
sion (”A”).
S
Uninterruptible
ventilation
S
Freecooling even in
emergency conditions
S
ON ---OFF control
S
Safetythermostat
S
Compact system
S
0 ---100% modulation
S
G4filter
S
Clogged filter
S
Cardboardbox
S
Wooden crate
S
LANmanagement
S
Epoxy coated coils
S
Up to 50 m equivalent
length
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