Airwell SLH 1402 [2/40] Reference standards
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Airwell SLH 1402 [2/40] Reference standards

Airwell SLH 1902 [2/40] Reference standards
Page 2
Design Features
General
The SLH air-to-water reverse cycle heat pumps are equipped with
low noise level axial fans and are suitable for exterior installation.
The units are supplied with complete charge of oil and HFC 407C
refrigerant.
The SLH units are factory tested in compliance with internal quality
system specifications and procedures, and are ready for field
installation.
The models SLH 1202 to 2602 consist of 2 independent
refrigerant circuits with one semi-hermetic twin screw compressor
on each circuit. They are equipped with a dual independent circuit
plate type heat exchanger.
The models SLH 2804 to 3804 have 4 independent refrigerant
circuits with one semi-hermetic twin screw compressor on each
circuit, two dual independent circuit plate type heat exchangers
and two independent electrical boards located on each end of the
unit.
The SLH range is available in 4 versions. Each version is composed
of 13 sizes.
SLH BLN : Reduced Low Noise Standard Version equipped
with Delta connected fans. Each fan is located in an externally
mounted nozzle profile housing generating low sound level. The
compressors are housed in a protective box. The SLH BLN units are
covering a nominal cooling capacity range from 261 to 775 kW
and a nominal heating capacity range from 287 to 853 kW.
SLH LN : Low Noise Version. These units are fitted with Delta
connected fans (each fan is located in an externally mounted nozzle
profile housing), with an acoustically insulated box mounted on
each compressor and with a fan speed controller. The SLH LN units
are covering a nominal cooling capacity range from 247 to 741 kW
and a nominal heating capacity range from 279 to 837 kW.
SLH ELN : Extra Low Noise Version having more fans than the
SLH LN version. These units are provided with Star connected low
speed fans, greater surface area condenser coils, fan speed
controller, acoustically insulated compressors box, and flexible pipes
and mufflers mounted on compressor discharge lines. The
SLH ELN units are covering a nominal cooling capacity range from
246 to 727 kW and a nominal heating capacity range from 278
to 824 kW.
SLH HET : High Efficiency and High Temperature Version
consisting of same condenser coils and same number of fans as
SLH ELN version. The fans are Delta connected and the compressors
are housed in protective boxes. These units are provided without
fan speed controller, nor flexible pipes and mufflers on discharge
lines of compressors. The SLH HET units are suitable for operation,
in cooloing mode, at high ambient temperatures (up to +46 °C)
and are covering a nominal cooling capacity range from 269 to
792 kW and a nominal heating capacity range from 294 to 852 kW.
Reference standards
The following applies to all the sizes and versions belonging to the
SLH units :
¾ Machine Directive : EEC 98/37 (EN 292/1, EN 292/2)
¾ Low Voltage Directive : EEC 73/23 (EN 60204-1, EN 60439-1)
¾ Electromagnetic Compatibility Directive : EEC 89/336 as
modified by Directive EEC 92/31 (EN 50081-1, EN 50082-2)
¾ Pressure Equipment Directive : 97/23/CE
Cabinet and structure
The unit base and frame is of heavy gauge galvanized steel
fastened with non-corrosive screws and bolts. Galvanized steel
parts are painted with baked-on enamel coloured white
(RAL 9001).
The SLH units have a very compact structure, with optimized
footprint, designed on 4, 6 and 8.4 meter long bases.
Semi-hermetic screw compressors
The compressors installed in the SLH units are of semi-hermetic
twin screw type.
All compressors are fitted with a standard electronic control system
ensuring the following functions :
¾ protection against high temperature and excessive load ;
¾ correct direction of rotation ;
¾ phase monitoring.
The main features of cooling capacity control of each compressor
are stated below :
¾ compressor capacity reduction by means of solenoid valves ;
¾ capacity reduction steps relative to each compressor : 25% (at
start-up and pump down), 50%, 75% and 100% ;
¾ 6 capacity steps are then provided on 2 refrigerant circuit
units : 25%, 50%, 63%, 75%, 87% and 100% and 12 steps on 4
refrigerant circuit units.
Furthermore, the screw compressors are provided with control
devices to make the SLH units more reliable :
¾ electric motor temperature sensor ;
¾ discharge temperature sensor ;
¾ liquid injection.
The compressors are complete with an external oil cooler to reduce
the compressor discharge temperature; allowing then the unit to
operate at higher ambient temperatures (in chiller mode) and to
produce hot water at lower ambient temperatures (in heat pump
mode).
The compressor oil is cooled by means of an oil/freon plate heat
exchanger fed by a thermal expansion valve arranged on the offtake
of the main liquid line. The thermal expansion valve is placed
downstream a solenoid valve controlled by a thermostat located at
the compressor discharge line.
The compressors are supplied with a Part-Winding and/or
Star-Delta starting system (refer to section "Compressor electrical
data").
Evaporators
Evaporators are of dual independent circuit brazed plate type heat
exchanger.
They are insulated with a 19 mm thick closed cell foam material
and are fitted with an electric cable resistance on the external
surface to prevent the unit from freezing at a low temperature
(down to -18 °C), when the unit is off.
Water connections are of 3" male threaded type.
Optional inlet and outlet manifolds can be supplied on the units
with two evaporators (SLH 2804 to 3804) to ensure single flow and
return water connections.
Condenser coils
The condenser coils are consisting of seamless 1/2" copper tubes,
arranged in staggered rows, mechanically expanded into
corrugated aluminium fins.
The coil circuiting has been specially adopted to increase the
performance of the refrigerant.

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