16 Aermec cod.
5167556_03 17.09
NRK 0200-0700
5. DESCRIPTION OF COMPONENTS
5.1. REFRIGERANT CIRCUIT
SCROLL COMPRESSORS
Rotary air-tight scroll type compressor, with vapour injection and two-pole electric
motor.
All compressors come with casing resistance, electronic thermal protection with
centralised manual resetting and twopole electric motor.
COOLING/HEATING EXCHANGER SYSTEM SIDE
Braze welded AISI 316 steel plate heat exchanger, insulated externally with closed cell
neoprene anticondensation material. When the unit is not running, it is protected
against formation of ice inside by an electric resistance.
5.1.1. WATER FEATURES
System: Chiller with plate heat exchanger
PH 7,5-9
Electric conductivity 100-500μS/cm
Total hardness 4,5-8,5 dH
Temperature < 65°C
Oxygen content < 0,1 ppm
Max. glycol amount 50%
Phosphates (PO4) < 2ppm
Manganese (Mn) < 0,05 ppm
Iron (Fe) < 0,3 ppm
Alkalinity (HCO3) 70 - 300 ppm
Chloride ions (Cl-) < 50 ppm
Sulphate ions (SO4) < 50 ppm
Sulphide ion (S) none
Ammonium ions (NH4) none
Silica (SiO2) < 30ppm
SOURCE SIDE HEAT EXCHANGER
Finned pack heat exchanger made with copper pipes
and aluminium fins adequately spaced to ensure better
heat exchange performance.
EXCHANGER SYSTEM SIDE
Braze welded AISI 316 steel plate heat exchanger, insulated externally with closed cell
neoprene anti-condensation material. When the unit is not running, it is protected
against formation of ice inside by an electric resistance.
ECONOMIZER
Circuito economizzatore con scambiatore a piastre (AISI 316); consente di aumentare
le prestazioni soprattutto agli elevati rapporti di compressione, ad esempio in caso di
basse temperature esterne nel funzionamento invernale.
CYCLE REVERSING VALVE
4-way cycle reversing valve. Inverts the flow of refrigerant gas.
LIQUID STORAGE TANK
(always passed by)
Compensates the difference in volume between finned coil and plate exchanger,
retaining 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.
NON-RETURN VALVES
Allows one-way flow of the refrigerant.
THERMOSTATIC VALVES
Mechanical valves, with external equaliser positioned at evaporator outlet, modulates
the flow of gas to the evaporator, depending on the heat load, in order to ensure a
correct heating level of the intake gas.
SOLENOID VALVES
The valve closes when the compressor switches off, blocking the flow of refrigerant
gas to the evaporator, recovery and the coil.
LIQUID SEPARATOR
Positioned on compressor intake for protection
against any return of refrigerant fluid, flooded start-up and functioning in the presen-
ce of liquids.
INDICATOR FOR LIQUID
Used to check presence of humidity in cooling circuit.
5.2. STRUCTURE AND FANS
SUPPORT STRUCTURE
Structure made of hot-dipped galvanised steel sheets, painted with polyester
powders, built to guarantee easy accessibility for service and maintenance.
STANDARD FANS
Axial fans with IP 54 degree of protection, external rotor, helical blades, housed in
nozzles, complete with accident-prevention protective screen. 6-pole electric motor
with built-in circuit breaker.
They are equipped as standard with condensation check via a device that continu-
ously adjusts the fans' speed.
LARGER FANS
Offer a useful head to avoid pressure drops
of the aeraulic system if the fans need to be channelled.
LARGER INVERTER FANS
(available only from size 0500 to 0700).
5.3. STANDARD HYDRAULIC CIRCUIT
WATER FILTERS
Equipped with steel filtering mesh, prevents the heat exchangers both of the system
side and the DHW/heating system side from clogging.
FLOW SWITCHES
They have the task of controlling that there is water circulation inside the heat
exchangers; if this is not the case, they block the unit.
AIR VENT VALVE
Mounted on the top of the hydraulic system; they discharge possible air pockets.
5.3.1. COMPONENTS OF HYDRAULIC CIRCUIT IN CONFIGURABLE VERSIONS
PUMPS
High or low static pressure.
It is possible to request a second pump to operate in standby for the first (twin
pumps) with high or low pressure levels. The pumps work in programmed rotation
and, in the event of a fault on the operating pump, switch-over is automatic.
EXPANSION VESSEL
With nitrogen pre-load membrane.
SAFETY VALVE
Equipped with a piped discharger, intervenes by discharging the over pressure in case
of anomalous pressures.
SYSTEM BUFFER TANK
Made of steel to reduce heat loss and to eliminate the formation of condensation,
insulated by thick polyurethane.
Supplied as per standard with 300W electric anti-freeze resistance (as low as -20°C
outside temperature - 5°C tank water temperature) controlled by anti-freeze probe
inserted in tank.
5.4. SAFETY AND CONTROL COMPONENTS
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