AERMEC nrl R410A, Technical Installation Maintenance Manual, Page: 6 / 56

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4. DESCRIPTION OF THE UNIT
− The appliances in the NRL series
are units used for the production
of cold water for technological
systems. The heat pump models
also allow to produce hot water
for heating. They are made up of
two R410A cooling circuits and a
unique hydraulic circuit, which may
or may not be supplied with stor-
age or pumping unit. The presence
of several scroll compressors al-
lows
NRL chillers various partialisa-
tions of the cooling capacity.
The electronic adjustment with mi-
croprocessor controls and manag-
es all components and functioning
parameters. An internal memory
records the functioning conditions
when an alarm occurs in order to
show it on the display. The units
have an
IP 24 protection rating.
4.1. MODELS AVAILABLE
− “COOLING ONLY” (° - L)
maximum external temperature
accepted
42°C ;
− temperature water product 18°C;
− “ HEAT PUMP ” (H - HL)
in cooling mode the operational lim-
its reach a maximum external air
temperature of
42°C;
− temperature water product 18°C;
− in heating mode the operational
limits reach a maximum external
air temperature of
42°C;
− temperature water product 50°C;
− NRLH does not envision the fol-
lowing configurations:
− YH (with water produced lower than 4 °C)
− HC (motorcondencing heat pump)
4.2. VERSIONS AVAILABLE
• RECUPERATORI DI CALORE:
HEAT RECUPERATORS:
with desuperheater inserted
in series (D).
− ATTENTION:
In heat pump models the desuper-
heater must be shut-off in heat
pump mode, or the warranty will be
come void.
• Total heat recovery (T)
With plate heat exchanger
inserted in parallel with the coils.
− Both of these versions (D - T) have:
− Hot gas by-pass device upstream
from the evaporator.
− Water filter before the recovery
heat exchanger.
Units with Desuperheater (D)
or Total Recovery (T) do not envision
the following versions:
− YD
− YT
− XT (only for temperature under 4°C)
− XD (only for temperature under 4°C)
4.3. SILENCED
MOTORCONDENSERS (CL)
The NRL-C motorcondensers do not
envision the following versions:
− HC (motorcondencing heat pump)
− TC (motorcondensing with total recovery)
− DC motorcondensing with storage
tank.
Mechanical thermostatic valve
− version Y: it is the version that al-
lows to produce cooled water be-
low the standard value of +4 °C to a
minimum of -6 °C. Contact the head
office for lower values.
NRL_Tecnico (standard-silenziata3)_01_EN.indd 04 22/06/2009 11.47.08