EN
21.11 - 6755517_05
9
5. DESCRIPTION OF COMPONENTS
5.1. CHILLER CIRCUIT
SCROLL COMPRESSORS
High efficiency scroll-type hermetic compressors, assembled on elastic antivibra
-
tion 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 mecha-
nical expansion of the pipes. Provided with protective grid.
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
Allow one-way flow of the fluid.
THERMOSTATIC VALVE
The mechanical valve, with external equaliser positioned at the evapora-
tor 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.
4-WAY CYCLE REVERSE VALVE
Inverts the flow of refrigerant gas.
ONE-WAY VALVES
Allows the passage of the refrigerant in just one direction.
LIQUID STORAGE TANK
Compensates the difference in volume between louveres coil and plate
exchanger, withholding excess liquid.
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 electric 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 COMPONENTS
WATER FILTER
Equipped with steel filtering mesh; prevents the heat exchangers from
clogging.
It is indispensable in order to prevent serious damage to the plate
exchanger.
DIFFERENTIAL PRESSURE SWITCH
It checks that here is water circulation inside the heat exchangers. Adver-
sary, it blocks the unit.
SAFETY VALVE
Equipped with a piped discharger and intervenes by discharges the over
pressure in case of anomalous pressures.
AIR VENT
Assembled on the upper part of the hydraulic system; it releases any air
bubbles that may be present in the system.
5.4. HYDRAULIC COMPONENTS FOR CONFIGURABLE VERSIONS
CIRCULATION PUMP
Depending on the characteristics of the pump chosen, it offers a useful
head to overcome the pressure drops in the system.
EXPANSION TANK
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 eliminate the phenome-
non 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.
5.5. SAFETY AND CONTROL COMPONENTS
HIGH PRESSURE SWITCH
With fixed calibration, placed on high pressure side of cooling circuit, inhi-
bits 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.
System: Chiller with plate heat exchanger
PH
7.5-9
Electric conductivity
10-500μS/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
