9
Aermec cod. 14.09 4086982_03
NRL 2000-3600 60Hz
EN
5.
DESCRIPTION OF COMPONENTS
5.1.
CHILLER CIRCUIT
SCROLL COMPRESSORS
High efficiency scroll-type hermetic compressors, as-
sembled on elastic antivibration supports, driven by a
2-pole electric motor with internal thermal protection.
of the electric heater casing included as standard. The
heater is automatically powered when the unit stops,
provided that the unit is kept under tension.
WATER SIDE HEAT EXCHANGER
Of the plate-type (AISI 316), externally insulated with
closed cell material to reduce thermal dispersion.
Fitted, as standard, with antifreeze heater.
5.1.1.
WATER FEATURES
SOURCE SIDE HEAT EXCHANGER
Made with copper pipes and aluminium louvered fins
blocked by mechanical expansion of the pipes. Provi-
ded with protective grid.
DESUPERHEATER / TOTAL RECOVERY
Unit with (AISI 316) heat plate, insulated externally
with closed cell material to reduce heat loss.
CYCLE INVERSION VALVE
(ONLY HEAT PUMP VERSION)
4way cycle inversion valve. Inverts the flow of refrige-
rant gas.
LIQUID STORAGE TANK
(ONLY HEAT PUMP VERSION/TOTAL RECOVERY)
Compensates the difference in volume between louve-
res coil and plate exchanger, withholding excess liquid.
DEHYDRATOR FILTER
Hermetic-mechanical with cartridges made of ceramic
and hygroscopic material, able to withhold impurities
and any traces of humidity present in the cooling
circuit.
ONE-WAY VALVES
Allows the passage of the refrigerant in just one
direction.
MECHANICAL THERMOSTATIC VALVE
The mechanical valve, with external equaliser positio-
ned at the evaporator inlet, modulates the flow of gas
to the evaporator, according to the heat load, in order
to ensure a correct heating level of the intake gas.
SOLENOID VALVE
The valve closes when the compressor turns off,
preventing the flow of refrigerant gas towards the
evaporator.
INDICATOR FOR LIQUID PASSAGE WITH HUMIDITY
PRESENCE SIGNAL
Used to check the refrigerant gas load and the eventual
presence of humidity in the cooling circuit.
LIQUID AND PRESSING LINE TAPS
(ONLY COOLING VERSION)
Allows interruption of the refrigerant in the case of
extraordinary maintenance
.
LIQUID SEPARATOR
(ONLY HEAT PUMP VERSION)
Located on the suction point of the compressor, to pro-
tect against any flowback of liquid refrigerant, flooded
start-ups, operation in the presence of liquid.
BY PASS SOLENOIDE VALVE
(ONLY HEATING RECOVERY VERSION)
By-passes the thermostatic valve during the defrosting
cycle.
5.2.
FRAME AND FANS
SUPPORT FRAME
Load-bearing structure Made of hot-galvanised steel
sheet of a suitable thickness, varnished with polyester
powders able to resist atmospheric agents over time.
VENTILATION UNIT
Axial fan, balanced statically and dynamically. The elec-
tric fans are protected electrically by magnet-circuit
breakers and mechanically by anti-intrusion metal
grids, according to the IEC EN 60335-2-40 Standard.
5.3.
HYDRAULIC CIRCUIT STANDARD COM
-
PONENTS
FLOW SWITCH
It checks that there is circulation of water.If
this is not the case, it blocks the unit
WATER TEMPERATURE PROBE (IN-OUT)
AIR VENT
Of the automatic type, assembled on the upper part of
the hydraulic system; it releases any air bubbles that
may be present in the system.
DRAIN TAP
5.4.
HYDRAULIC COMPONENTS FOR CONFI
-
GURABLE VERSIONS
CIRCULATION PUMP
(HIGH/LOW PUMP)
Depending on the characteristics of the pump chosen,
it offers a useful head to overcome the pressure drops
in the system.
EXPANSION TANK
(STANDARD SUPPLY TO PUMP AND STORAGE TANK
VERSION)
With nitrogen pre-load membrane.
SAFETY VALVE
Equipped with a piped discharger and intervenes by
discharges the over pressure in case of anomalous
pressures.
STORAGE TANK
In order to reduce the thermal dispersion and elimina-
te the phenomenon of the formation of condensation,
it is insulated with polyurethane material of a suitable
thickness. It is required to reduce the number of peaks
of the compressor and to even the temperature of
water to be sent to the utilities.
STORAGE TANK DRAIN TAP
WATER FILTER
Equipped with steel filtering mesh; prevents the heat
exchangers from clogging.
5.5.
SAFETY AND CONTROL COMPONENTS
HIGH PRESSURE SWITCH (MANUAL RESET)
With fixed calibration, placed on high pressure side of
cooling circuit, inhibits functioning of compressor if
abnormal work pressure occurs.
HIGH PRESSURE TRANSDUCER
Placed on high pressure side of cooling circuit, signals
the work pressure to control board, generating a pre-
warning in case abnormal pressure occurs.
LOW PRESSURE TRANSDUCER
Allows displaying, on the microprocessor board display,
the value of the compressor's suction pressure (one
per circuit) on the low-pressure side of the cooling
circuit
SAFETY VALVE
Equipped with a piped discharger and intervenes by
discharges the over pressure in case of anomalous
pressures.
- Set at 45 bar on the branch HP
- Set at 30 bar on the branch LP
LOW PRESSURE SWITCH
5.6.
ELECTRICAL PANEL CONTROL AND
POWER
Electric board in compliance with standards EN 60204-
1/IEC 204-1, complete with:
- door lock main isolating switch,
- fuses and contactors for compressors and fans,
- terminals for REMOTE PANEL,
- spring type control circuit terminal board,
- outdoor electric board with double door and
gaskets,
PH
6-8
Electric
conductivity
less than 200 mV/cm
(77°F / 25°C)
Chloride ions
less than 50 ppm
Sulphuric acid ions
less than 50 ppm
Total iron
less than 0.3 ppm
Alkalinity M
less than 50 ppm
Total hardness
less than 50 ppm
Sulphur ions
none
ammonia ions
none
Silicone ions
less than 30 ppm
