Airwell VLC 604 [3/24] Electronic control
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Airwell VLC 604 [3/24] Electronic control

Airwell VLC 604 [3/24] Electronic control
Page 3
Technical Features (continued)
Fan speed control
The speed of fans is controlled in order to operate at a low ambient
temperature.
On units with standard axial fans, the fan speed control, supplied
as standard, is of a temperature actuated step type (for BLN and LN
versions) and of a pressure actuated stepless type with an electronic
controller (for ELN version).
The pressure actuated stepless type fan speed controller can be
supplied as optional on BLN and LN versions. It allows the units to
operate in cooling mode at ambient temperature down to -18 °C.
On HSE and SIF units with electronic axial fans, the pressure
actuated stepless type fan speed control is supplied as standard,
because these electronic fans are already equipped with an
integrated fan speed control (fan speed range : 50 to 1200 rpm;
ambient temperature limit : -18 °C.
Refrigerant circuits
All the units are composed of two independent and separate
refrigerant circuits.
Each refrigerant circuit is equipped with suction and liquid line
shut-off valves to allow the connection of the unit to the external
evaporator.
The functional diagram of each circuit is shown in the section
"Refrigerant flow diagram".
Electrical board
Metal case, externally arranged at one end of the unit. Case for the
board with IP54 protection rating, complete with grille for natural
air ventilation of the box.
Control and safety devices
Each unit is fitted with the following devices :
Safety :
➜ Power disconnect switch with an emergency stop function.
➜ HP switches (double on each circuit of sizes 1004 to 1204), set to
42 bar, automatic reset and manual reset from the control
panel.
➜ Safety valve on discharge lines, set to 46 bar.
Control :
➜ HP and LP transducers (two for each circuit).
➜ Ambient air temperature sensor.
Electronic control
The units are supplied with the new microprocessor-based electronic
control and management system ensuring the following functions :
➜ Management of the operation of compressors :
a) Power on/off
b) Anticycle management
c) Tandem unloading for high pressure or high compressor
pressure ratio (integrated inside the curves of compressor
operating limits).
➜ Management of high and low pressure alarms.
➜ Management of external interlocks.
➜ Management of the remote control :
d) Unit power on/off
e) Summary alarm signals
➜ Remote signalling, by dry contacts :
f) Voltage presence
g) Compressors in operation
h) Alarm, circuit 1
i) Alarm, circuit 2
The unit controller can also clearly show all control parameters of
the machine on the liquid crystal display, such as :
➜ Display of the ambient air temperature.
➜ Display of the circuit 1 and circuit 2 discharge pressure and
suction pressure.
➜ Display of the set point.
➜ Display of the various alarm and operation status :
j) Compressor start-up alarm (discharge pressure check)
k) Low / High pressure
l) Control of the compressor operating hours
m) Compressors in operation
n) Thermal protection of compressors
o) Thermal protection of fans
p) Faulty sensors
Standard equipment
Set point timer/clock card.
Temperature actuated fan speed control.
Back light display.
Digital pressure and temperature reading kit.
High ambient pressure control.
Sequence phase control.
Control circuit transformer 400 V/230 V.
Data logger.
Power supply without neutral.
Hour meter.
Main switch.
Refrigerant R410A.
PED approval.
Compressor jacket (ELN version only).
Compressor box.
Rubber anti-vibration pad.
Factory installed options
ModBus protocol kit for BMS.
Lonwork protocol kit for BMS.
Bacnet protocol kit for BMS.
Compressors soft starter.
Pressure actuated stepless fan speed controller for low ambient
operation (-18 °C).
Power factor correction capacitors.
Compressors overload protection.
GSM.
HP & LP manometers.
Condenser coils with blue fins treatment.
Condenser coils with "Fin Guard Silver" (polyurethane)
treatment.
Condenser coils with copper fins.
Chiller grilles.
Field-installed accessories
Remote ON/OFF control.
Airconet protocol kit for BMS.
Remote keyboard panel.
Master and slaves control, up to 4 units max.
Spring anti-vibration mounts for basic unit.
Spring anti-vibration mounts for unit with copper fins.

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