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DESCRIPTION OF MAIN COMPONENTS
STRUCTURE
These units are normally installed outdoors, often on the roof of a building. For this reason the structure of the
unit is made entirely in galvanised steel, painted with corrosion-resistant polyester powder. All external
fastenings are in stainless steel.
The panels can be easily removed to facilitate maintenance and all internal components can be accessed via
two sides of the unit.
COMPRESSORS
Ultra-reliable rotating SCROLL compressors from a leading
manufacturer are used (in tandem on models 00403 and
00504). All ARA units have two independent refrigerant
circuits, ensuring at least 50% capacity in the unlikely event
of a fault in one of the circuits.
The microprocessor control manages the switching on and
off of the compressors in order to ensure effective control
of unit capacity; capacity steps depend on the type of
control fitted; in the case of the mP20 control the steps are:
0 - 45 - 100%
on models 00182 and 00232
0 - 50 - 100%
on models 00202, 00252 and 00302
0 - 45 - 70 - 100%
on model 00403
0 - 25 - 50 - 75 - 100% on model 00504
These units are available in versions for use with HCFC-
R22 and HFC-R407C (environment-friendly) refrigerants.
Units for operation with R134a are available on special
order from UNIFLAIR ITALIA Srl.
In order to prevent the refrigerant fluid diluting the oil and
creating foam when the unit is started all free cooling or
heat pump ARA models are fitted with oil heaters which
switch on automatically when the compressor stops.
Each compressor is fitted on rubber mountings to reduce
vibration transmission.
FANS
The sickle-blade axial fans are directly connected to external rotor motors which can be fitted with voltage
modulation speed control. The metal support grille conforms to all the main safety standards. The motors
have class F insulation and IP44 protection under DIN VDE 0470 section 1/11.92 and EN 60529.
Modulating condensation temperature control is available with fan speed regulation. This control is standard
with certain unit configurations (ultra low-noise versions, free cooling versions, partial heat recovery).
EVAPORATOR
The brazed plate heat exchangers are in AISI 316 stainless steel. The exchanger is fully lined with closed-cell
expanded polyurethane to prevent the formation of condensation and to limit heat loss. Given the internal
volume and operating pressure, the evaporator does not need ISPESL or TÜV homologation under the
standards for pressurised containers.
Summary of Contents for Aquaflair 00152
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