Download SERVICE MANUAL

1 --- Preliminary operations
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1.1 --- Foreword
This manual covers the installation, operation and maintenance of HPS air conditioners, which are composed of an
evaporating unit (HPSE), positioned in the room, and a condensing unit (HPSC), positioned outside.
IMPORTANT:
Also consult the manual for the microprocessor control.
1.2 --- Check operating limits
The units are designed to operate within specific working
ranges (see Tab. 1, Tab. 2, Tab. 3, Tab. 4, Tab. 5 and Tab. 6).
These limits are referred to new machines or for those that
have been correctly installed and serviced. The warranty
clauses are no longer valid for any damage or malfunction
that may occur during or due to operation outside the application range.
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(e.g. acid vapours).
Position the internal evaporating unit (HPSE) so as to optimise the indoor air distribution and avoid hot spots.
Position the indoor unit preferably in the centre of the
room ceiling.
Fix the unit to the ceiling by inserting expansion or
through clamps (in this case ensure the clamp is sealed)
using the slots on the two side brackets (see Fig. 2a,
Fig. 2b and Fig. 2c).
Make sure the airflow circulates freely.
To allow the servicing of the unit, the Service Area shown
in Fig. 2a and Fig. 2b, has to be left unobstructed (in
Fig. 2a the 300 mm minimum clearance from the back of
the evaporating unit is compulsory).
Check if the unit is horizontal on both sides ”A” and
”B” (see. Fig. a).
Fig. a) Horizontal level control
1.3 --- Check sound pressure levels
Tab. 1, Tab. 2, Tab. 3, Tab. 4, Tab. 5 and Tab. 6 show the internal (HPSE) and external (HPSC) sound pressure levels for
units in standard configuration, in continuous operation, at
2m from the front surface of the machine, 1m above base
level, and referred to free field conditions.
“A”
“B”
1.4 --- Conditioner inspection
On receiving the equipment immediately inspect its condition; report any damage to the transport company at once.
1.5 --- Transport
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Always keep the unit vertically upright and do not leave
it in the open.
While carrying the unit, avoid exerting any pressure on
the upper corners of the package.
Unpack the unit as close as possible to its installation
position. Once unpacked, avoid any impact to its internal
components.
1.6 --- Sealing the room
To create stable thermohygrometric conditions within the
room, proceed as follows:
S vapour seal the walls, floor and ceiling using an impermeable material;
S make sure that the room is airtight by sealing all gaps,
cable entries, etc.
1.7 --- Servicing areas
The unit must be provided with a suitable service area (see
Fig. 4).
All maintenance of the evaporating unit can be carried out as
shown in Fig. 2a and Fig. 2b.
Access to the condensing unit is provided by removable panels with screw fixings.
2 --- Installation
CAUTION:
The evaporating unit (HPSE) must never be installed outdoors.
2.1 --- Overall dimensions
See Fig. 1a, Fig. 1b, Fig. 1c, Fig. 1d, Fig. 1e and Fig. 1f for
the overall dimensions of the evaporating unit (HPSE) and
external condensing unit (HPSC).
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The ceiling installation of two units operating in the same
room must be carefully evaluated, considering the following
factors:
1) each intake side of the machine must be able to intake as
much as the other two;
2) possible ”Freecooling” function;
3) the thermal loads to be dissipated can be true hot air
flows hitting the intake sides of the machines: in this case,
the two intake sides of the two machines can be arranged
even at a short distance (up to 300 mm) to intake the thermal load where it is highest.
2.4 --- Freecooling duct connections
(optional)
The air conditioner may be supplied with an integrated Freecooling device (optional), which uses fresh air from outside to
cool the room without starting up the compressor. The device
provides the correct cooling capacity required, using a
motorised, modulating damper. In this case, the rear of the
unit is equipped with connections which draw in the outside
air, as follows:
S double circular holes, for 202 mm (HPSE 06) or 252 mm
(HPSE 08---10---12---14) diameter flexible ducts to be
fixed with metal clamps;
S single rectangular hole with flange for 560x190 mm
(HPSE 06) or 600x250 mm (HPSE 08---10---12---14) duct
(not supplied by Liebert---HIROSS).
In both cases, the holes in the wall have to be protected by
rainproof grilles with a prefilter, to avoid water or foreign
bodies getting into the conditioner.
Outside air, taken into the room by the fan, is exhausted
through an overpressure damper, which is installed on the
wall of the room and protected by an external rainproof grille .
2.4.1 --- External air temperature probe installation
2.2 --- Positioning the HPSE indoor unit
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2.3 --- Positioning two inner HPSE units
Unpack the unit as close as possible to the place where
it has to be installed. Once unpacked, avoid stress and
any impact to its internal components.
The indoor unit can be installed in any indoor location
provided it is not exposed to an aggressive environment
Install the external air temperature probe at the end of the
freecooling duct.
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