EDM VLC S.2GB08.16

3
Specifications (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
40.5 bar, automatic reset and manual reset from the control panel.
➜ Safety valve on discharge lines, set to 45 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
3 Set point timer/clock card.
3 Temperature actuated fan speed control.
3 Back light display.
3 Digital pressure and temperature reading kit.
3 High ambient pressure control.
3 Sequence phase control.
3 Control circuit transformer 400 V/230 V.
3 Data logger.
3 Power supply without neutral.
3 Hour meter.
3 Main switch.
3 PED approval.
3 Compressor jacket (ELN version only).
3 Compressor box.
3 Rubber anti-vibration pad.
Factory installed options
3 ModBus protocol kit for BMS.
3 Lonwork protocol kit for BMS.
3 Bacnet protocol kit for BMS.
3 Compressors soft starter.
3 Pressure actuated stepless fan speed controller for low ambient operation
(-18 °C).
3 Power factor correction capacitors.
3 Compressors overload protection.
3 GSM.
3 HP & LP manometers.
3 Condenser coils with blue fins treatment.
3 Condenser coils with "Fin Guard Silver" (polyurethane) treatment.
3 Condenser coils with copper fins.
3 Chiller grilles.
Field-installed accessories
3 Remote ON/OFF control.
3 Airconet protocol kit for BMS.
3 Remote keyboard panel.
3 Master and slaves control, up to 4 units max.
3 Spring anti-vibration mounts for basic unit.
3 Spring anti-vibration mounts for unit with copper fins.