Airwell SLH 1902 [3/40] Control
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Airwell SLH 1902 [3/40] Control

Airwell SLH 2202 [3/40] Control
Page 3
Spécifications (cont'd)
Condenser coil fans
The condenser fans are of direct drive propeller type composed of
wing contour blades. All fans have diameter of 800 mm. Each of
them is fitted with a painted galvanized steel protective guard.
Each fan is equipped with a nozzle profile housing which generates
low noise level during the operation of the unit.
Fan controls
The standard units operate, in chiller mode, with an external air
temperature down to -5 °C thanks to the use of a fan step controller
which consists in desactivating a certain number of fans for each
step.
A stepless fan speed controller can be supplied as optional in order
to allow the units to operate with an external air temperature down
to -18 °C.
The minimum external operating temperature on LN and ELN
units is -18 °C, thanks to the stepless fan speed controller supplied
as standard.
Refrigerant circuits
Each SLH unit has 2 or 4 independent refrigerant circuits according
to the models.
Each refrigerant circuit is composed of components as shown in the
section "Refrigerant flow diagram".
Electrical board
Electrical board is a metal box of IP54 weather protection, arranged
inside the unit and protected by a horizontally pivoted external
panel.
On models SLH 2804 to 3804, an auxiliary electrical board (IP54)
in an external metal box is located at the opposite end of the unit.
In this case, 2-point power supply connections will be supplied.
Single point power supply connections can be provided as optional.
Control and safety devices
All the SLH units are fitted with the following devices :
Safety :
¾ Main disconnect switch equipped with an emergency stop.
¾ HP switches (two on each circuit) set to 26.5 bar : manual reset
from control board.
¾ LP transducers (one on each circuit) used as pressure switches
and set to 1 bar : manual reset from control board. Transducers
allow also suction pressure reading.
¾ Anti-freeze temperature sensor (set to +3 °C).
¾ Maximum discharge temperature sensor (not displayed).
¾ Discharge line safety valve set to 29 bar.
¾ Evaporator safety valve set to 29 bar.
¾ Water differential pressure switch on evaporator, set to
104 mbar (50 mbar on models SLH 2202 and 2602),
corresponding to about 50% of the nominal flow rate.
Control :
¾ HP transducers (one on each circuit).
¾ Evaporator water inlet temperature sensor.
¾ Evaporator water outlet temperature sensor.
¾ Ambient air temperature sensor.
¾ Coil temperature sensor.
Controls
The SLH units are supplied with a microprocessor based electronic
control and management system ensuring the following functions :
Management of liquid / pump down solenoid valves :
¾ Compressor starts when solenoid valve is energized.
¾ Pump down takes place when solenoid valve is de-energized.
Management of compressor operation :
¾ Start-up / Stop.
¾ Management of delays at start-up.
Chilled/hot water temperature control on evaporator water
return or leaving :
¾ Control on return water : proportional type (RWT P) or integral
proportional type (RWT P+I) with integration time to be
parametrized.
¾ Control on leaving water (LWT).
Standard control : RWT P.
Evaporator protection.
Fan protection.
Automatic coil defrost management.
Hydraulic module management.
Management of high and low pressure alarms.
Remote control management :
¾ Unit start-up and stop.
¾ Alarm signalling.
Programming of 4 hour periods with 4 different set points.
Alarm records.
Counting of compressor and pump (if present) operation
hours.
Operating mode "Night/Low noise" (for versions LN and ELN
only).

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