AERMEC NRL, Техническое руководство по установке и обслуживанию

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INRLPY. 02.10 4086916_01
Danger!
The refrigerant circuit is under steam. High temperatures are also
possible. The unit may only be opened by a service technician (SAT) or by
an authorised technician. The operations in the cooling circuit can only
be performed by a qualified refrigeration technician.
GAS R410A
The chiller is delivered with the correct refrigerant load.The R410A is free
of chlorine, it is not flammable and does not harm the ozone layer.
However, any interventions are always competence of the technical
service assistance (SAT) or an authorised technician.
2. DESCRIPTION AND
CHOICE OF THE UNIT
The NRL is a set of devices designed to
produce cold water for technological
systems. ACCORDING TO
the size of several
several coolingand hydraulic circuits,
and according to the version, they can
have desuperheaters, total recovery, only
pumping unit or accumulator with
pumping
unit.
The presence of more than one scroll type
compressor allows the
NRL chillers various
capacity controls of the cooling capacity.
By means of a microprocessor, the electronic
regulation controls and manages all the
components and working parameters of
the unit; an internal memory registers the
working conditions in the moment when an
alarm condition arises, in order to visualise it
on the display.
2.1. VERSIONS AVAILABLE
− “COOLING ONLY” (° - L)
maximum outside temperature
allowed
42°C ;
− processed water temperature 18°C;
− “HEAT PUMP” (H - HL)
in cooling mode, the operating
limits arrive at a maximum external
air temperature of
42°C;
− processed water temperature 18°C;
− in heating mode, the operating
limits arrive at a maximum external
air temperature of
42°C;
− processed water temperature 50°C;
− NRLH do not offer the following
configurations:
− YH (with processed water lower than
4°C )
− HC (condensing heat pump)
2.2. VERSIONS AVAILABLE
• HEAT RECOVERY UNITS
with desuperheater inserted in
series (D).
− WARNING:
in the heat pump versions, the
desuperheater must be intercepted
during heat pump operation:
otherwise, the guarantee will no
longer be considered valid.
• Total heat recovery (T)
With plate-type exchanger inserted
in parallel with the coils
− Both versions (D - T) use:
− a hot gas bypass device upstream
from the evaporator
− Water filter before the recovery
exchanger.
The units with desuperheater (D)
or total recovery (T) are not available in
the versions:
− YD
− YT
− XT (only for temperature lower than 4°C )
− XD (only for temperature lower than 4°C )
The NRL-C condensing units are not available
in the versions:
− HC (condensing heat pump)
− TC (condensing units with total recovery)
− DC (condensing units with desuperheater)
− Mechanical thermostatic valve (Y):
− version Y: this is the version that
allows you to produce chilled water
below the standard value of
+4°C ,
to a minimum of -6°C . For lower
values, contact the company
headquarters.