Airwell VLS 704 [30/85] English
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Airwell VLS 704 [30/85] English

Airwell VLS 704 [30/85] English
Page 29
English
OOppttiioonnss DDeessccrriippttiioonn
English
GGeenneerraall DDeessccrriippttiioonn
7 GENERAL DESCRIPTION
7.1 Introduction
The VLS/VLH units are water chillers /air-water heat
pumps provided with hermetic scroll compressors
with two refrigeration circuits.
These units are fit for cooling and heating intermediate
fluids (glycoled water), for air-conditioning applica-
tions in industrial processes.
These units can be installed outdoor on the roof of a
building or at ground level.
This series includes the following versions:
VVeerrssiioonn ((SSTTDD//HHSSEE
11
)) DDeessccrriippttiioonn
VLS/VLH Base Low Noise version (BLN
2
)
VLS/VLH Low Noise version (LN)
VLS/VLH Extra Low Noise version (ELN)
VLS/VLH High Temperature version (HET)
Air condensing chillers/heat pumps, using
R410A refrigerant.
1
High efficiency Units (HSE) with inverter fans
2
A High Pressure Fan (SIF) version is available
For each VLS version, the corresponding condensing unit version (VLC) is available
Available options:
VLS/D
VLH/D
VLR
The heat recovery is carried out by a desuperheater mounted on the compressor's
discharge line.
7.2 General specifications
The VLS/VLH units are supplied complete and provi-
ded with all connecting pipes for the refrigerant and
internal wiring.
The refrigeration circuit of each unit undergoes a
pressure test, is drained, vacuumised, dehydrated
and filled with refrigerant, and includes the neces-
sary oil. Once assembled, each unit is subjected to a
complete final testing and the correct operation of all
refrigeration circuits is checked.
The base and the frame of each unit are made of
very thick galvanised sheet, and are secured by
screw and stainless bolts. All panels are secured by
screw and tropicalised steel bolts, they can be disas-
sembled for easy access to internal components.
All galvanised steel parts are painted with white
polyester resin (RAL 9001), to ensure the resistance of
the unit to corrosion and weather agents over time.
7.3 Compressors
These units are provided with hermetic scroll com-
pressors, with built-in motor protection.
Compressors are mounted on shock absorbers to re-
duce vibrations. Motors are of direct start-up type,
cooled by the sucked refrigerant gas.
Thermistors protect the windings from any overtempe-
ratures and the electronic control checks that the deli-
very temperature is within the permissible range.
The capacity control, as well as the control of the deli-
vered cooling capacity, are always ensured by the
electronic control.
7.4 Refrigeration circuits
Each unit has two complete refrigeration circuits, in-
cluding: a service valve to fill the unit with refrigerant,
shut-off valves, thermostatic expansion valve, dehy-
drating filter, sight glass with humidity indicator, a dif-
ferential pressure switch for the water.
The outdoor VLC units, deriving from the VLS ver-
sions, are marked by the absence of the evaporator,
and are equipped with shutoff cocks on the suction li-
ne and on the liquid line, so as to allow the connec-
tion of remote evaporators.
Furthermore, each circuit is equipped with safety de-
vices in accordance with PED 97/23/EC: HP and LP
pressure switches, safety valves providing protection
in case of fire or malfunction of compressors.
7.5 Water heat exchanger
The evaporators are of stainless steel plate type.
Their thermal insulation is ensured by a thick flexible
closed-cell heat-insulating jacket. Furthermore, the fro-
st protection is ensured by electric heaters.
These exchangers can work at pressures up to 10
bar on the hydraulic side and 30 bar on the refrige-
rant side.
Total heat recovery is carried out by a heat exchanger mounted on the compres-
sor’s discharge line in parallel with the condensing circuit.
Heat recovery function is activated by mean of a 4-ways valve.
VLS-eng.qxp 12-04-2007 14:43 Pagina 29

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