![Airwell SWS 1602 HFС 407C [2/48] Electrical board](/img/pdf.png)
Airwell SWS 1602 HFС 407C [2/48] Electrical board
![Airwell SWS 1602 HFС 407C [2/48] Electrical board](/views2/1409257/page2/bg2.png)
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Design Features
General
The SWS water cooled screw chillers are equipped with high
capacity semi-hermetic screw compressors operating with high
compression ratios.
They are suitable for operation either with well water or with tower
water.
The SWS units are designed to be located in a plant room, thanks to
their optimized footprint and to the hooded options without or with
acoustic insulation intended to reduce sound emissions.
All the units are optimized to operate with HFC 407C or HFC 134a
refrigerant. The units with HFC 134a offer a COP particularly
high.
The SWS units consist of 2 independent refrigerant circuits with
one semi-hermetic twin screw compressor per circuit. They are
equipped with a "dual circuit" shell and tube type evaporator and
two shell and tube type condensers.
The SWS range can also be supplied without condensers, but
complete with shut-off valves on discharge and liquid lines to allow
users to connect remote condensers. This range is called
SWR
condenserless screw chillers.
The SWS/SWR range is available in 3 versions. Each version is
composed of 12 sizes (units with HFC 407C) covering nominal
cooling capacity range from 291 to 1148 kW and 15 sizes
(units with HFC 134a) covering nominal cooling capacity range
from 272 to 1118 kW.
SWS/SWR STD : standard version without any soundproofing
structure.
SWS/SWR LN : Low noise version having same equipment as STD
version, but complete with a closed sheet metal hood intended to
reduce sound emissions. This closed hood can be supplied as a kit
(to be field installed) or supplied fitted in the factory. In the last case,
the LN unit is composed of STD unit plus LN kit.
SWS/SWR ELN : Extra low noise version having same equipment
as LN version, but hood is coated with soundproofing material.
Mufflers and flexible pipes are also supplied on compressor
discharge lines to further reduce sound emissions.
Reference standards
The following applies to all the sizes and versions belonging to the
SWS units :
✓ Machine Directive : EEC 98/37 (EN 292/1, EN 292/2)
✓ Low Voltage Directive : EEC 73/23 (EN 60204-1, EN 60439-1)
✓ Electromagnetic Compatibility Directive : EEC 89/336 as
modified by Directive EEC 92/31 (EN 50081-1, EN 50082-2)
✓ Pressure Equipment Directive : 97/23/CE
Structure
The unit structure is made of heavy gauge galvanized steel fastened
with screws and bolts. Galvanized steel parts are coated with baked
paint coloured white (RAL 9001).
Semi-hermetic screw compressors
The compressors installed in the SWS units are of semi-hermetic
twin screw type.
All compressors are fitted with an electronic control system ensuring
the following functions :
- protection against high temperature and excessive load ;
- correct direction of rotation ;
- phase monitoring.
Each compressor offers main features as stated below :
- compressor capacity reduction by means of solenoid valves ;
- capacity reduction steps relating to each compressor : 25% (at
start-up and pump down), 50%, 75% and 100% ;
- 6 capacity steps are then provided on each unit : 25%, 50%,
63%, 75%, 87% and 100%.
Furthermore, the screw compressors are provided with control
devices to make the SWS units more reliable :
- electric motor temperature sensor ;
- discharge temperature sensor ;
- liquid injection (optional).
Evaporator/Condensers
Evaporator and condensers are of a shell and tube type.
Evaporator consists of a dual circuit and is insulated with a 19 mm
thick closed cell foam material.
Condensers are equipped with removable heads allowing condenser
tubes to be extracted for maintenance operations.
Refrigerant circuits
Each unit has two independent refrigerant circuits. Each refrigerant
circuit is composed of components as shown in the section
"Refrigerant flow diagram".
Electrical board
Electrical board is a metal case of IP 42 protection degree, arranged
outside the unit and protected by one or two access doors according
to the models.
Control and safety devices
All the SWS units are fitted with the following devices :
Safety :
- Main disconnect switch equipped with an emergency stop.
- HP switches (two on each circuit) set to 25 bar (HFC 407C) and
22 bar (HFC 134a) : manual reset from control board.
- 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.
- Anti-freeze temperature sensor (set to +3 °C).
- Maximum discharge temperature sensor (not displayed).
- Discharge line safety valve set to 29 bar (HFC 407C) and
24.5 bar (HFC 134a).
- Evaporator safety valve set to 29 bar (HFC 407C) and 16 bar
(HFC 134a).
-
Water differential pressure switch on evaporator, set to 104 mbar,
corresponding to about 50% of the nominal flow rate.
Control :
- HP and LP transducers (one on each circuit).
- Evaporator water inlet temperature sensor.
- Evaporator water outlet temperature sensor.
- Condenser water inlet temperature sensor.
- Condenser water outlet temperature sensor.
Содержание
- Control 2
- Control and safety devices 2
- Design features 2
- Electrical board 2
- Evaporator condensers 2
- General 2
- Page 2 2
- Reference standards 2
- Refrigerant circuits 2
- Safety 2
- Semi hermetic screw compressors 2
- Structure 2
- Controls 3
- Design features cont d 3
- Factory installed options 3
- Field installed accessories 3
- Page 3 3
- Page 4 4
- Refrigerant flow diagrams 4
- Swr units 4
- Sws units 4
- Operating limits 5
- Page 5 5
- Units with hfc 134a 5
- Units with hfc 407c 5
- Correction factors 6
- Ethylene glycol solution correction factors 6
- Fouling factors 6
- Low temperature operation correction factors 6
- Page 6 6
- Pressure drop correction factors for low temperature operation 6
- Page 7 7
- Physical data sws 1002 to 2202 hfc 407c 7
- Page 8 8
- Physical data sws 2602 to 4402 hfc 407c 8
- Page 9 9
- Physical data swr 1002 to 2202 hfc 407c 9
- Page 10 10
- Physical data swr 2602 to 4402 hfc 407c 10
- Page 11 11
- Physical data sws 1602 to 2802 hfc 134a 11
- Page 12 12
- Physical data sws 3012 to 4802 hfc 134a 12
- Page 13 13
- Physical data swr 1602 to 2802 hfc 134a 13
- Page 14 14
- Physical data swr 3012 to 4802 hfc 134a 14
- Electrical data 15
- Page 15 15
- Sws swr hfc 134a 15
- Sws swr hfc 407c 15
- Page 16 16
- Sound data 16
- Sws swr std hfc 134a 16
- Sws swr std hfc 407c 16
- Page 17 17
- Sound data cont d 17
- Sws swr ln hfc 134a 17
- Sws swr ln hfc 407c 17
- Page 18 18
- Sound data cont d 18
- Sws swr eln hfc 134a 18
- Sws swr eln hfc 407c 18
- Cooling capacities sws 1002 to 2202 hfc 407c 19
- Page 19 19
- Cooling capacities sws 1002 to 2202 hfc 407c cont d 20
- Page 20 20
- Cooling capacities sws 2602 to 4402 hfc 407c 21
- Page 21 21
- Cooling capacities sws 2602 to 4402 hfc 407c cont d 22
- Page 22 22
- Cooling capacities swr 1002 to 2202 hfc 407c 23
- Page 23 23
- Cooling capacities swr 1002 to 2202 hfc 407c cont d 24
- Page 24 24
- Cooling capacities swr 2602 to 4402 hfc 407c 25
- Page 25 25
- Cooling capacities swr 2602 to 4402 hfc 407c cont d 26
- Page 26 26
- 30 25 30 27 32 30 35 33 38 well water 4 pass tower water 2 pass tower water 2 pass tower water 2 pass tower water 2 pass 27
- Cap kw 27
- Cooling 27
- Cooling capacities sws 1602 to 2802 hfc 134a 27
- Heat rej kw 27
- Input kw 27
- Lwt condenser c 27
- Lwt evap c 27
- Lwt leaving water temperature 27
- Models 27
- Page 27 27
- 40 38 43 40 45 42 47 45 50 tower water 2 pass tower water 2 pass tower water 2 pass tower water 2 pass tower water 2 pass 28
- Cap kw 28
- Cooling 28
- Cooling capacities sws 1602 to 2802 hfc 134a cont d 28
- Heat rej kw 28
- Input kw 28
- Lwt condenser c 28
- Lwt evap c 28
- Lwt leaving water temperature 28
- Models 28
- Page 28 28
- Cooling capacities sws 3012 to 4802 hfc 134a 29
- Page 29 29
- Cooling capacities sws 3012 to 4802 hfc 134a cont d 30
- Page 30 30
- 35 40 45 50 55 31
- Cap kw 31
- Condensing temperature c 31
- Cooling 31
- Cooling capacities swr 1602 to 2802 hfc 134a 31
- Heat rej kw 31
- Input kw 31
- Lwt evap c 31
- Lwt leaving water temperature 31
- Models 31
- Page 31 31
- Cooling capacities swr 3012 to 4802 hfc 134a 32
- Page 32 32
- Evaporator hfc 407c 33
- Flow rate l s 33
- Page 33 33
- Pressure drop kpa 33
- Water pressure drops 33
- 30 40 50 60 70 80 90100 34
- 6 7 8 9 10 10 34
- 90 100 34
- Evaporator hfc 134a 34
- Flow rate l s 34
- Page 34 34
- Pressure drop kpa 34
- Water pressure drops continued 34
- Condensers hfc 407c 35
- Flow rate l s 35
- Page 35 35
- Pressure drop kpa 35
- Water pressure drops continued 35
- 30 40 50 60 70 80 90100 36
- 6 7 8 9 10 10 36
- 90 100 36
- Condensers hfc 134a 36
- Flow rate l s 36
- Page 36 36
- Pressure drop kpa 36
- Water pressure drops continued 36
- Dimensions in mm 37
- Frame sizes 37
- Page 37 37
- Sws std frame 1 37
- Sws swr hfc 134a std ln eln versions 37
- Sws swr hfc 407c std ln eln versions 37
- Dimensions in mm cont d 38
- Page 38 38
- Swr std frame 1 38
- Dimensions in mm cont d 39
- Page 39 39
- Swr std frame 2 39
- Sws std frame 2 39
- Dimensions in mm cont d 40
- Page 40 40
- Swr std frame 3 40
- Sws std frame 3 40
- Dimensions in mm cont d 41
- Page 41 41
- Swr std frame 4 41
- Sws std frame 4 41
- Dimensions in mm cont d 42
- Page 42 42
- Sws swr ln eln frame 1 42
- Dimensions in mm cont d 43
- Page 43 43
- Sws swr ln eln frame 2 43
- Dimensions in mm cont d 44
- Page 44 44
- Sws swr ln eln frame 3 44
- Sws swr ln eln frame 4 44
- Page 45 45
- Space requirements 45
- Sws swr frame 1 45
- Page 46 46
- Space requirements cont d 46
- Sws swr frame 2 46
- Page 47 47
- Space requirements cont d 47
- Sws swr frame 3 and 4 47
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