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Idiomas disponibles
Idiomas disponibles
The devices of the NRA range are
units used to produce cold water for
technological systems; the heat pump
models also allow you to produce hot
water for heating. They consist of two
R407C refrigerating circuits and a
single hydraulic circuit (which may or
may not be fitted with an accumulation
unit).
The presence of more than one scroll
type compressor allows the NRA chillers
various capacity controls of the cooling
capacity.
The use of more than one scroll type
compressor allows a high level of
efficiency, even with partial loads. In
these cases in fact, a variable number
of scroll compressors are working,
each at 100% (i.e. maximum efficiency)
of the output power. By means of
a microprocessor, the electronic
regulation controls and manages
all the components and working
parameters of the unit; an internal
memor y r egis t er s t he wor king
conditions in the moment when an
alarm condition arises, in order to
visualise it on the display. The units
have a protection rating of IP 24.
2. 1
MODELS AVAILABLE
- "STANDARD COOLING ONLY (°)"
maximum outside temperature
allowed 42°C. Acoustic protection
cover for the compressor, for quiet
2.2. 1 Standard equipment
ALL THE VERSIONS COME WITH:
1.
Evaporator anti-freeze heater
Compressor carter heater
2.
Remote control panel
3.
4.
Water filter only supplied in 00 ver-
sions
5.
Flow meter on in versions with
hydraulic kit
HEAT PUMPS
TP1
Low pressure transducer
TP2
High pressure transducer
DCPX
Device for regulating fan speed,
standard only for version HL
CHILLERS WITH ACCUMULATION
1.
Evaporator anti-freeze heater
DESCRIPTION AND CHOICE OF UNIT
2
operation.
- "HEAT PUMP (H)" in cooling mode
the operating limits arrive to a
maximum outside air temperature
of 46°C. NRAH do not envisage the
following configurations:
- YH (with processed water lower
than 4°C)
- HC (condensing heat pump)
- HA
(heat
pump
temperature because the heat
pump is, by its very nature, a
machine for high temperatures)
2.2
VERSIONS AVAILABLE
- "STANDARD/BASE"
Maximum outside temperature
allowed 42°C, acoustic cover for the
compressor, for quieter operation.
- "HIGH TEMPERATURE"
only for cold working versions)
via the expansion of the pack finned
heat exchanger, it allows you to
widen the operating limits, arriving at
a maximum outside air temperature
of 46°C.
- "SILENCED (L)" r e p r e s e n t s t h e
models designed for particularly
quiet operation. All the sizes
ar e fitt ed with a device for
regulating the fan speed. When
the temperature is lower than
2.
High or low pressure pumping unit
3.
Water filter mounted
4.
Flow meter 1 per circuit
5.
Parallel hydraulic supplied
3.
OPTION: high or low pressure
pump with possibility of a reserve
pump. The rotation of the pumps
(to optimise their working hours)
is made manually, via a selector on
the electric panel.
4.
OPTION: high or low pressure
pump with possibility of a reserve
pump. The rotation of the pumps
(to optimise their working hours)
is made manually, via a selector on
the electric panel.
35°C, the low noise ver sion
further reduces the number of fan
rotations, thereby obtaining an
even quieter operation than that in
nominal conditions.
- "SILENCED HEAT PUMPS (HL)"
represents the models designed for
particularly quiet operation.
All the sizes are fitted with a device
in
high
for regulating the fan speed.
-
"CONDENSING UNITS C"
-
"SILENCED CONDENSING UNITS
LC"
- "VERSION Y" 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.
only the version YA is available.
(available
WARNING
For the devices designed to work with a
low air temperature, and also the heat
pumps, before starting up the unit (or
at the end of each period of prolonged
disuse) it is extremely important for
the oil of the compressor carter to
be heated beforehand, via the power
supply to the special heaters, for at
least 8 hours. The carter heater is
automatically powered when the unit
stops, provided that the unit is kept
under tension.
3
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