Airwell VLC 604 [2/24] Compressors
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Airwell VLC 604 [2/24] Compressors

Airwell VLC 604 [2/24] Compressors
Page 2
General
The new VLC units have been designed to operate with
HFC 410A refrigerant. Both compressors and heat exchangers
have been optimized for this refrigerant.
They consist of two independent refrigerant circuits, a tandem
high efficiency and low vibration level Scroll compressors on each
circuit and a ventilating unit comprising V-shape coils and quiet
fans; each of them is located in an externally mounted nozzle
profile housing generating low sound level.
The VLC units are available in 8 sizes, from size 524 to 1204, with
a nominal capacity range from 154 to 347 kW.
The VLC-STD (Standard) version can be supplied with
3 acoustic options :
Base Low Noise (BLN) : The units are equipped with delta
connected fans implying a standard rpm. The units are not
supplied with fan speed controller, but fitted with
compressors
box
to reduce the noise emissions.
Low Noise (LN) : The units are equipped with star connected
fans implying a low rpm. The units are not supplied with fan
speed controller, but fitted with compressors box to reduce the
noise emissions.
Extra Low Noise (ELN) : The units are equipped with star
connected fans, fitted with a speed controller which allows the
units to operate with a very low rpm. The units are supplied with
compressors box and soundproof jackets on compressors
reducing significantly the noise emissions.
To increase their field of applications, the VLC ranges are available
in 3 additional versions :
HSE (High Seasonal Efficiency) version : It has same
equipment as that of the STD version, except that the units are
equipped with special inverter fans, of large diameter, driven
by EC (electronic brushless type) motors with integrated
electronic inverter, to ensure low energy consumption. This
version can be supplied with BLN, LN or ELN acoustic options.
HT (High Temperature) version : It has same equipment
as that of the BLN units, but the units are fitted with
special
inverter fans and motors identical to those of the HSE version,
but with a different regulation. The HT version can be supplied
with BLN acoustic option only.
SIF (Special Inverter Fan) version : It has same equipment as
that of the BLN units, except that the units are equipped with
special
inverter fans (same as those used on HSE version, but with a different
regulation) driven by EC motors with integrated electronic
inverter. The SIF version provides external static pressure up to
120 Pa. This version can be supplied with BLN acoustic option
only.
Technical Features
Units with R410A refrigerant (it will be the real replacement of
R22). As near azeotropic mixture it behaves like a homogeneous
substance (reduced service problems in case of leakage or
re-charge) with negligible temperature glide.
Refrigerant with superior thermo-dynamical proprieties
compared to R22 and R407C, it allows to have more efficiency
or compact and lighter systems and larger operating limits
(T ambient = -10 °C in heating mode).
With except for the fans, all the versions keep the same
configuration of the base units (same structure, electrical board,
compressors and coils). Easy upgrade of the units in stock
or on the field.
Optimized coils design (30% refrigerant charge reduction).
Compressors box (less sound proofing) always installed
- additional compressors jackets only for ELN version (easy
upgrade of the units in stock).
Special version (HSE) developed for high seasonal efficiency
(ESEER higher than 4.5 (more than 15% compared to standard
version)) and high operation limits with inverter fans (electronic
brushless type motor). Axial fan of large diameter.
Special version (SIF) for high external static pressure (max.
120 Pa)
with inverter fans (electronic brushless type motor).
Axial fan of large diameter. These fans are the same as those
used on HSE units.
Modified and improved base frame - AVM fitted underneath of
base frame so no brackets request (no problem for track and
container freight). In the same positions, the plastic feet will be
installed for fork handling.
New microprocessor : 4 times greater RAM memory
compared with previous version, flash memory card and
compressors envelope curves put inside, 3 times faster than
previous control.
For service operation, special valves dedicated to R410A are
supplied on the refrigerant system. These valves, of 5/16" flare
SAE type, are mounted on the liquid line and on the gauges
manifold of the unit.
Reference standards
The following applies to all the sizes and versions of VLC units :
Machine Directive EEC 98/37 (EN 292/1, EN 292/2)
Low Voltage Directive EEC 73/23 (EN 60204-1, EN 60439-1)
Electromagnetic Compatibility Directive EEC 89/336 as modified
by Directive EEC 92/31 (EN 50081-1, EN 50082-2)
Pressure Equipment Directive 97/23/CE
Cabinet and structure
The unit cabinet and structure are made of heavy gauge galvanized
steel coated with polyester powder based painting (RAL 9001). All
parts of the structure are fastened totally with non-corrosive screws
and bolts.
Compressors
Each unit is equipped with four compressors arranged in two
tandems to suit the two refrigerant circuits.
The compressors are of hermetic scroll type and fitted with
an electronic control system ensuring protection against high
temperature and excessive load.
All compressors have direct-on-line starting and are mounted on
rubber vibration isolators in order to minimize noise and vibration
transmission.
Condenser coils
The condenser coils are made of seamless copper tubes, arranged
in staggered rows, mechanically expanded into corrugated
aluminum fins.
Condenser fans
For each size, all versions keep the same number of fans.
Large diameter, direct drive axial type fans with asynchronous three-
phase motors are used in all acoustic versions (BLN, LN & ELN) of
VLC 524-1204 STD units.
Special inverter fans with electronic brushless type motors are used
in VLC 524-1204 HSE, SIF and HT units.
On high pressure fans of SIF units, the external static pressure
(≤ 120 Pa) can be adjusted on site to match the customer demand
directly from the electronic control panel of the unit.
Fans are equipped with externally mounted nozzle profile housing
which generates low sound levels.
Key Points

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