EconoAir 2011 A3 Econo Air Gas Fired Heaters A4 X EAIR0411
User Manual: EconoAir Gas Fired Air Heaters-2011 A4-X EAIR0411
Open the PDF directly: View PDF 
.
Page Count: 8
STOKVIS INDUSTRIAL BOILERS
(INTERNATIONAL) LIMITED
96R Walton Road East Molesey Surrey KT8 0DL
TELEPHONE 020 8783 3050 • FACSIMILE 020 8783 3051
Email: info@stokvisboilers.com • Website: http://www.stokvisboilers.com
EAIR 0411
ECONO-AIR
Direct/Indirect Gas Fired
Heating and Ventilation Systems
SDF and SIDF SERIES
Introduction
The Stokvis comprehensive range of gas fired air heaters
provides high efficiency combined heating and ventilation
solutions across a broad spectrum of industrial and
commercial applications. Combined heating and ventilation
units ensure precise control, excellent indoor air quality and
optimum energy efficiency.
The units are available as either direct fired (SDF) or indirect
fired (SIDF) to give complete flexibility for optimum design
capability. Both the direct fired and indirect fired range of units
are fully CE approved and a comprehensive range of optional
equipment can be added to the standard models to allow
systems to be tailored to meet the requirements for factories,
warehouses and other types of large open space buildings.
Where applicable the units are currently Energy Technology
Listed by the Carbon Trust to allow qualifying users to claim
100% Enhanced Capital Allowances.
For large open areas the units are available with a wide
range of optional air distribution heads to provide ductless air
distribution. This is achieved by slightly pressuring the building
to ensure very even air distribution both laterally and vertically,
thereby eliminating the requirement for extensive distribution
duct work and high level de-stratification fan units.
Where duct work is required the units can be supplied with
either forward or backward curved fans to allow for duct work
resistance up to 2000 pascals thereby making them eminently
suitable for use with air induction systems.
Features and Benets
• Fully CE approved units for both indoor
and outdoor installation
• High thermal efficiency for reduced operating costs
• Currently ECA listed models
• SFP compliant with current Building regulations
• Fully compatible for use with transpired solar panels to
facilitate use of renewable solar energy
• Units are supplied fully wired and complete with controls
• Close temperature control
• Fully modulating direct gas fired burner control with 20:1
turn down ratio
• Indirect fired units with turn down ratio of up to 12:1
Model Range and Options
• Indirect gas fired units 15kW-900kW
• Direct gas fired units 30kW-1200kW
• Airflow range 0.5m³/s to 25m³/s
• External static pressures up to 2000 pascals depending
on airflow
• Horizontal units
• Vertical units
• Indoor or fully weather proofed outdoor units
• Variable supply air volume with inverter drives
• Panel and/or bag filters
• Mixing box complete with dampers and optional actuators
• Integral silencer section
• Optional evaporative cooling module
• Heat recovery
• Air distribution heads
System Types
The units are designed to provide the primary heat source
across a wide range of applications including:
• Ductless air distribution
• Air Induction systems
• Tempered input ventilation
• Industrial make up air
• Industrial air displacement ventilation
• Pressure ventilation systems
Controls
To maximise the efficiency of operation Stokvis supply a range
of fully integrated control packages to suit each application.
Units are supplied fully wired and complete with all starters
and contactors etc, plus time and temperature control via an
integral Trend controller.
Optimised start and stop is included as standard and controls
are password protected to prevent unauthorised adjustment.
For smaller systems a SmartCom control panel may be used
instead of the Trend control to provide simple user-friendly
control with a comprehensive range of features.
The units are also fully compatible with BMS systems and
alternative BMS Controls maybe integrated within the control
strategy.
Applications
• Aircraft hangars
• Arenas and exhibition halls
• Factory heating and ventilation
• Localised air replacement for booths and extract booths
• Make-up air for buildings with mechanical exhaust
• Sports halls
• Swimming pool hall heating and condensation control
• Warehouse and distribution centre heating
DIRECT FIRED TECHNICAL DATA
MODEL Std burner size
minimum kW
output
Std burner size
maximum kW
output
Minimum air flow
m3/s
Maximum air flow
m3/s
SDF1 MUA VAV 26 0.51 0.86
SDF2 MUA VAV 53 66 1.03 1.41
SDF3 MUA VAV 66 132 1.79 2.82
SDF4 MUA VAV REC 92 198 2.57 4.00
SDF5 MUA VAV REC 132 264 3.85 5.13
SDF7 MUA VAV REC 198 330 5.13 7.00
SDF9 MUA VAV REC 264 462 6.42 9.00
SDF11 MUA VAV REC 264 594 8.98 11.55
SDF14 MUA VAV REC 396 660 10.27 1400
SDF18 MUA VAV REC 462 924 14.12 18.18
SDF25 MUA VAV REC 594 1056 17.96 25.71
DIRECT FIRED MUA & VAV APPROXIMATE DIMENSIONS
MODEL MUA & VAV HORIZONTAL UNITS MUA & VAV VETICAL UNITS Outlet size
std fan
mm2
Air inlet
size h x w
mm
Aprox
weight
exc.
filters kg
Height
mm
Width mm Length
mm
Length
C/W
filters mm
Depth
mm
Depth
C/W
filters mm
Width
mm
Height
mm
SDF1 800 860 1800 2420 700 1390 860 2854 229 600 X 760 225
SDF2 800 860 1800 2420 700 1390 860 2854 322 600 X 760 250
SDF3 1100 1100 2000 2640 1000 1690 1100 3554 453 900 X 1000 300
SDF4 1350 1250 2600 3240 1250 1940 1250 3954 507 1150 X 1150 400
SDF5 1800 1500 2900 3540 1650 2340 1500 4604 638 1550 X 1500 500
SDF7 1800 1500 2900 3540 1650 2340 1500 4604 715 1550 X 1500 515
SDF9 2050 2000 3200 3840 1900 2590 2000 5354 801 1800 X 1900 900
SDF11 2050 2000 3200 3840 1900 2590 2000 5354 898 1800 X 1900 925
SDF14 2350 2200 3500 4140 2200 2930 2200 5854 1007 2100 X 2100 1200
SDF18 2500 2600 3500 4140 2350 3080 2600 6404 1130 2250 X 2500 1400
SDF25 2500 2600 3500 4140 2350 3080 2600 6404 1267 2250 X 2500 1600
MODEL REC HORIZONTAL UNITS REC VERTICAL UNITS
SDF4 1800 1500 3540 4180 1650 2340 1500 4700 507 1550 X 1400 700
SDF5 1800 1500 3540 4180 1650 2340 1500 4700 638 1550 X 1400 800
SDF7 1800 1500 3850 4490 1650 2340 1500 4700 715 1550 X 1400 900
SDF9 2050 2000 4200 4840 1900 2590 2000 5050 801 1800 X 1900 1100
SDF11 2350 2200 4280 4920 2200 2930 2200 5520 898 2060 X 2060 1350
SDF14 2350 2200 4540 5180 2200 2930 2200 5720 1007 2060 X 2060 1450
SDF18 2500 2600 4640 5280 2350 3080 2600 6020 1130 2210 X 2460 1650
SDF25 2750 2600 4880 5520 2600 3330 2600 6445 1267 2460 X 2460 1800
1 All dimensions and weights are approximate and should be confirmed with Stokvis.
2 All details are for internal units, please contact Stokvis for external unit information.
3 Filter dimensions include side access panel and/or bag filters.
4 Units will be delivered in sections to suit individual project.
5 External static pressures of up to 2000 Pa are available contact Stokvis for details of non standard units.
1 SDF-MUA are fixed volume fresh air units for Make Up Air applications, SDF-VAV models are full fresh air units complete with inverter drive to supply variable air volumes
to suit demand. SDF-REC models are complete with patented air recirculation to provide full fresh air or up to 80% recirculation air in variable proportions.
2 Each unit is available with a range of airflows and different burner sizes to give required temperature rise through the units up to a maximum of 42°C T.
3 Maximum airflow for SDF25 REC is 22.5m3/s.
4 Units may be specified to suit alternative airflows and a range of external static pressure requirements up to 400 pascals (dependent on options fitted).
For higher static pressures please consult Stokvis.
Δ
SDF/MUA SDF/VAV SDF/RECDirect Fired Units
100%
Fresh air
Variable
volume
fresh air
20 – 100%
Fresh air
80 – 100%
Recirculating air
Constant volume direct fired make up
air (MUA) heaters to provide a fixed rate
of heated fresh air to the space.
The units are ideal for supplying heating
and make up air to large areas or to
individual spray booths etc, where
constant extract rates are used.
Generally units are sized to introduce
slightly more make up air into the space
than the extract air volume.
A balanced amount of make up air can
provide a slight positive pressure to
distribute the air uniformly throughout
the building and eliminate random
air infiltration.
For special applications such as kitchen
make up air and certain industrial
processes where the transfer of odours
or dust etc to surrounding areas
needs to be avoided, the volume of
make up air supplied is lower than the
extract rate.
The variable air volume (VAV) models
allow the volume of heated make
up air to vary to suit the changing
requirements of the building orchanging
exhaust rates.
The units are fitted with a special box
burner system complete with integral
fan(s) to ensure optimum combustion
throughout the range of varying volume
main air supply.
The units supply 100% fresh air at all
times but the volume of fresh air is
automatically adjusted either by the
application of a building pressure sensor
or temperature sensors.
The building pressure sensor can be
set to maintain either a slight positive or
negative pressure inside the building to
suit the requirements of the application.
When used for space heating,
temperature sensors adjust both the
air discharge temperature and the
supply air volume to provide a rapid
warm up and maintain minimal
stratification levels.
Variable air recirculation (REC) models
are fully CE approved and patented.
They provide a constant air volume with
up to 80% recirculation air.
The variable air recirculation option
combines a constant supply of 20%
fresh air which passes over the burner
with the remaining air volume being
either fresh air, recirculation air or a
mixture of fresh and recirculated air.
The variable percentage of fresh air and
recirculation air is accurately controlled
via a fully modulating face and bypass
damper with fresh air introduced using
the burner section and recirculation air
via an integral bypass.
The fully modulating burner and damper
control functions are integrated via a
microprocessor control to co-ordinate
the heating and ventilation functions.
The system can provide variable
make-up air, full building heating or
a combination of both, controlled
via building pressure sensors and
temperature sensors to respond
automatically to building pressure and
temperature requirements.
The Principle of Direct Firing – Make-Up Air
Where air is extracted from a building either for process or
environmental reasons a supply of heated replacement air
is required to balance the system and maintain comfort. If
make up air is not provided the extract system will perform
inefficiently at reduced capacity and a negative pressure will
be created. This results in cold air being drawn in around
the perimeter of the building and causing cold spots and
unpleasant draughts.
For new installations the supply of heated make up air can
often provide the required ventilation without the need to
install additional extract units. Where matching extract is
required this can be integrated in the same unit to supply
both input and exhaust with the option of heat recovery from
the extract air. Direct gas firing provides a highly efficient
method of providing heated replacement air with thermal
efficiencies of 100% (based on NCV) and fully modulating
burner control withup to 20:1 turndown ratio.
Variable air volume or air recirculation units allow systems
to be matched to constantly changing extract rates or to
provide full space heating in applications where reduced
winter ventilation rates are required.
Combined Heating and Ventilation
In heating mode Stokvis units provide controlled amounts
of fresh air to slightly pressurise the building and the supply
air temperature is constantly monitored and adjusted via a
fully modulating burner control to optimise the heat input to
match the precise building requirements.
Close control of the air discharge temperature virtually
eliminates heat stratification whilst slight building
pressurisation ensures very even distribution both laterally
and vertically over large areas, eliminating the requirement
for extensive ductwork distribution.
The amount of fresh air automatically adjusts to meet the
ventilation requirements of the space.
The units provide the ideal solution to large areas with
variable occupancy or industrial heating applications where
ventilation rates may change throughout the day.
In summer mode the units provide 100% fresh air with the
large primary air volumes providing improved air change
rates for optimum ’free cooling’. Optional evaporative cooling
modules may also be added.
Features and Benets
• High efficiency for reduced operating costs
• Fully modulating burner with high turn down
ratio (up to 20:1)
• Close control with rapid response to
temperature changes
• Low maintenance costs
• Improved indoor air quality
• Summer fresh air for “free cooling”
• Alternative model options allows systems to
be tailored to suit a wide range of applications
• Horizontal or vertical units
• Indoor or fully weather proofed outdoor units
• Optional evaporative cooling can be added
Indirect Gas Fired Heat Exchanger
Stokvis gas fired air heaters incorporate a high efficiency gas
fired heating coil with a minimum thermal efficiency of 91%
based on NCV, currently qualifying for Enhanced Capital
Allowances.
The gas fired heating coils have a number of advantages
compared to traditional heat exchangers and enable the
heat exchanger section to be closely matched with the filter
sizes etc. to minimise the airflow resistance and reduce the
specific fan power required. The heating coils also provide
an excellent turn down ratio for close temperature control.
Units are fully CE approved and are supplied with all
necessary safety and monitoring controls. Each coil is fitted
with a power flue venter and a differential pressure switch
which automatically shuts down the burner in the event of a
blocked flue or combustion air inlet.
Features and Benets
• Extended heat transfer area for high
efficiency and reduced operating costs
• Reduced operating temperature for
enhanced life expectancy
• Standard coils manufactured from heat
resisting stainless steel tube
• Optional aluminised steel tube heating coils
available at reduced cost for units operating
on full air recirculation
• Modular coils utilised on higher output units
to avoid the possibility of a complete plant
shut down in the event of a burner lockout
• Enhanced reliability: each burner is fitted
with a multi-try ignition system which allows
for five ignition attempts with a pre- and post
purge on each ignition sequence
• Pressure switch automatically shuts down
the burner in the event of a blocked flue or
combustion air inlet
• Alternative wall or roof flue terminations
• Simple wall flue outlet reduces installation
costs, eliminating roof penetrations and
potential roof leaks
Model Range and Options
• Heat outputs 15kW-900kW
• Airflow range 1m³/s to 22m³/s
• External static pressures up to 2000 pascals
depending on airflow
• Horizontal units
• Vertical units
• Indoor or fully weather proofed outdoor units
• Panel and/or bag filters
• Mixing box complete with dampers and
optional actuators
• Integral silencer section
• Heat recovery
• Air distribution heads
Indirect Fired Units
Anodised aluminium framework with optional inll panels.
Option 1 Mineral wool insulation (0.03w/mk), panel weight 16kg/m2.
Option 2 Eco panels with enhanced insulation (0.024w/mk). Patented hydrotec water formulated polyurethane foam provides
enhanced insulation and reduced weight of 8kg/m2. The injection process guarantees continuity of thickness and
adhesion to provide excellent panel rigidity, whilst integral double edge sealing provides improved air tightness.
All service panels are hinged for ease of access, with fan and burner compartment sections coming complete with locks.
Galvanised base frame complete with
lifting access points and levelling bolts.
Fans and motors are mounted on a separate
base frame complete with anti-vibration
mounts and flexible connections.
Standard units are supplied complete
with all wiring and controls.
Aluminium aerofoil section
dampers complete with edge
seals for precise control of
fresh air and recirculation air.
A comprehensive range of
damper actuators may be
factory fitted and wired to
provide occupancy ventilation
or fresh air free cooling
Wide choice of both
panel and bag filters.
Direct gas fired sections are fully CE certified
and provide 100% efficiency (NCV) and a turn
down ratio of up to 20:1.
Direct fired units provide the ideal energy
efficient solution for applications requiring
permanent ventilation or for buildings with
higher air infiltration rates.
Indirect gas fired sections
comprise of CE certified
coils. The gas fired coils
provide high efficiency
with high turndown ratio.
SDF / SIDF Series
GAS FIRED COMBINED HEATING AND VENTILATION
Specication
Typical Indirect Fired Unit Heater
Anodised aluminium framework with optional inll panels.
Option 1 Mineral wool insulation (0.03w/mk), panel weight 16kg/m2.
Option 2 Eco panels with enhanced insulation (0.024w/mk). Patented hydrotec water formulated polyurethane foam provides
enhanced insulation and reduced weight of 8kg/m2. The injection process guarantees continuity of thickness and
adhesion to provide excellent panel rigidity, whilst integral double edge sealing provides improved air tightness.
All service panels are hinged for ease of access, with fan and burner compartment sections coming complete with locks.
Galvanised base frame complete with
lifting access points and levelling bolts.
Fans and motors are mounted on a separate
base frame complete with anti-vibration
mounts and flexible connections.
Standard units are supplied complete
with all wiring and controls.
Aluminium aerofoil section
dampers complete with edge
seals for precise control of
fresh air and recirculation air.
A comprehensive range of
damper actuators may be
factory fitted and wired to
provide occupancy ventilation
or fresh air free cooling
Wide choice of both
panel and bag filters.
Direct gas fired sections are fully CE certified
and provide 100% efficiency (NCV) and a turn
down ratio of up to 20:1.
Direct fired units provide the ideal energy
efficient solution for applications requiring
permanent ventilation or for buildings with
higher air infiltration rates.
Indirect gas fired sections
comprise of CE certified
coils. The gas fired coils
provide high efficiency
with high turndown ratio.
SDF / SIDF Series
GAS FIRED COMBINED HEATING AND VENTILATION
Specication
Typical Indirect Fired Unit Heater
SDF/MUA SDF/VAV SDF/RECDirect Fired Units
100%
Fresh air
Variable
volume
fresh air
20 – 100%
Fresh air
80 – 100%
Recirculating air
Constant volume direct fired make up
air (MUA) heaters to provide a fixed rate
of heated fresh air to the space.
The units are ideal for supplying heating
and make up air to large areas or to
individual spray booths etc, where
constant extract rates are used.
Generally units are sized to introduce
slightly more make up air into the space
than the extract air volume.
A balanced amount of make up air can
provide a slight positive pressure to
distribute the air uniformly throughout
the building and eliminate random
air infiltration.
For special applications such as kitchen
make up air and certain industrial
processes where the transfer of odours
or dust etc to surrounding areas
needs to be avoided, the volume of
make up air supplied is lower than the
extract rate.
The variable air volume (VAV) models
allow the volume of heated make
up air to vary to suit the changing
requirements of the building orchanging
exhaust rates.
The units are fitted with a special box
burner system complete with integral
fan(s) to ensure optimum combustion
throughout the range of varying volume
main air supply.
The units supply 100% fresh air at all
times but the volume of fresh air is
automatically adjusted either by the
application of a building pressure sensor
or temperature sensors.
The building pressure sensor can be
set to maintain either a slight positive or
negative pressure inside the building to
suit the requirements of the application.
When used for space heating,
temperature sensors adjust both the
air discharge temperature and the
supply air volume to provide a rapid
warm up and maintain minimal
stratification levels.
Variable air recirculation (REC) models
are fully CE approved and patented.
They provide a constant air volume with
up to 80% recirculation air.
The variable air recirculation option
combines a constant supply of 20%
fresh air which passes over the burner
with the remaining air volume being
either fresh air, recirculation air or a
mixture of fresh and recirculated air.
The variable percentage of fresh air and
recirculation air is accurately controlled
via a fully modulating face and bypass
damper with fresh air introduced using
the burner section and recirculation air
via an integral bypass.
The fully modulating burner and damper
control functions are integrated via a
microprocessor control to co-ordinate
the heating and ventilation functions.
The system can provide variable
make-up air, full building heating or
a combination of both, controlled
via building pressure sensors and
temperature sensors to respond
automatically to building pressure and
temperature requirements.
The Principle of Direct Firing – Make-Up Air
Where air is extracted from a building either for process or
environmental reasons a supply of heated replacement air
is required to balance the system and maintain comfort. If
make up air is not provided the extract system will perform
inefficiently at reduced capacity and a negative pressure will
be created. This results in cold air being drawn in around
the perimeter of the building and causing cold spots and
unpleasant draughts.
For new installations the supply of heated make up air can
often provide the required ventilation without the need to
install additional extract units. Where matching extract is
required this can be integrated in the same unit to supply
both input and exhaust with the option of heat recovery from
the extract air. Direct gas firing provides a highly efficient
method of providing heated replacement air with thermal
efficiencies of 100% (based on NCV) and fully modulating
burner control withup to 20:1 turndown ratio.
Variable air volume or air recirculation units allow systems
to be matched to constantly changing extract rates or to
provide full space heating in applications where reduced
winter ventilation rates are required.
Combined Heating and Ventilation
In heating mode Stokvis units provide controlled amounts
of fresh air to slightly pressurise the building and the supply
air temperature is constantly monitored and adjusted via a
fully modulating burner control to optimise the heat input to
match the precise building requirements.
Close control of the air discharge temperature virtually
eliminates heat stratification whilst slight building
pressurisation ensures very even distribution both laterally
and vertically over large areas, eliminating the requirement
for extensive ductwork distribution.
The amount of fresh air automatically adjusts to meet the
ventilation requirements of the space.
The units provide the ideal solution to large areas with
variable occupancy or industrial heating applications where
ventilation rates may change throughout the day.
In summer mode the units provide 100% fresh air with the
large primary air volumes providing improved air change
rates for optimum ’free cooling’. Optional evaporative cooling
modules may also be added.
Features and Benets
• High efficiency for reduced operating costs
• Fully modulating burner with high turn down
ratio (up to 20:1)
• Close control with rapid response to
temperature changes
• Low maintenance costs
• Improved indoor air quality
• Summer fresh air for “free cooling”
• Alternative model options allows systems to
be tailored to suit a wide range of applications
• Horizontal or vertical units
• Indoor or fully weather proofed outdoor units
• Optional evaporative cooling can be added
Indirect Gas Fired Heat Exchanger
Stokvis gas fired air heaters incorporate a high efficiency gas
fired heating coil with a minimum thermal efficiency of 91%
based on NCV, currently qualifying for Enhanced Capital
Allowances.
The gas fired heating coils have a number of advantages
compared to traditional heat exchangers and enable the
heat exchanger section to be closely matched with the filter
sizes etc. to minimise the airflow resistance and reduce the
specific fan power required. The heating coils also provide
an excellent turn down ratio for close temperature control.
Units are fully CE approved and are supplied with all
necessary safety and monitoring controls. Each coil is fitted
with a power flue venter and a differential pressure switch
which automatically shuts down the burner in the event of a
blocked flue or combustion air inlet.
Features and Benets
• Extended heat transfer area for high
efficiency and reduced operating costs
• Reduced operating temperature for
enhanced life expectancy
• Standard coils manufactured from heat
resisting stainless steel tube
• Optional aluminised steel tube heating coils
available at reduced cost for units operating
on full air recirculation
• Modular coils utilised on higher output units
to avoid the possibility of a complete plant
shut down in the event of a burner lockout
• Enhanced reliability: each burner is fitted
with a multi-try ignition system which allows
for five ignition attempts with a pre- and post
purge on each ignition sequence
• Pressure switch automatically shuts down
the burner in the event of a blocked flue or
combustion air inlet
• Alternative wall or roof flue terminations
• Simple wall flue outlet reduces installation
costs, eliminating roof penetrations and
potential roof leaks
Model Range and Options
• Heat outputs 15kW-900kW
• Airflow range 1m³/s to 22m³/s
• External static pressures up to 2000 pascals
depending on airflow
• Horizontal units
• Vertical units
• Indoor or fully weather proofed outdoor units
• Panel and/or bag filters
• Mixing box complete with dampers and
optional actuators
• Integral silencer section
• Heat recovery
• Air distribution heads
Indirect Fired Units
SDF and SIDF SERIES
Introduction
The Stokvis comprehensive range of gas fired air heaters
provides high efficiency combined heating and ventilation
solutions across a broad spectrum of industrial and
commercial applications. Combined heating and ventilation
units ensure precise control, excellent indoor air quality and
optimum energy efficiency.
The units are available as either direct fired (SDF) or indirect
fired (SIDF) to give complete flexibility for optimum design
capability. Both the direct fired and indirect fired range of units
are fully CE approved and a comprehensive range of optional
equipment can be added to the standard models to allow
systems to be tailored to meet the requirements for factories,
warehouses and other types of large open space buildings.
Where applicable the units are currently Energy Technology
Listed by the Carbon Trust to allow qualifying users to claim
100% Enhanced Capital Allowances.
For large open areas the units are available with a wide
range of optional air distribution heads to provide ductless air
distribution. This is achieved by slightly pressuring the building
to ensure very even air distribution both laterally and vertically,
thereby eliminating the requirement for extensive distribution
duct work and high level de-stratification fan units.
Where duct work is required the units can be supplied with
either forward or backward curved fans to allow for duct work
resistance up to 2000 pascals thereby making them eminently
suitable for use with air induction systems.
Features and Benets
• Fully CE approved units for both indoor
and outdoor installation
• High thermal efficiency for reduced operating costs
• Currently ECA listed models
• SFP compliant with current Building regulations
• Fully compatible for use with transpired solar panels to
facilitate use of renewable solar energy
• Units are supplied fully wired and complete with controls
• Close temperature control
• Fully modulating direct gas fired burner control with 20:1
turn down ratio
• Indirect fired units with turn down ratio of up to 12:1
Model Range and Options
• Indirect gas fired units 15kW-900kW
• Direct gas fired units 30kW-1200kW
• Airflow range 0.5m³/s to 25m³/s
• External static pressures up to 2000 pascals depending
on airflow
• Horizontal units
• Vertical units
• Indoor or fully weather proofed outdoor units
• Variable supply air volume with inverter drives
• Panel and/or bag filters
• Mixing box complete with dampers and optional actuators
• Integral silencer section
• Optional evaporative cooling module
• Heat recovery
• Air distribution heads
System Types
The units are designed to provide the primary heat source
across a wide range of applications including:
• Ductless air distribution
• Air Induction systems
• Tempered input ventilation
• Industrial make up air
• Industrial air displacement ventilation
• Pressure ventilation systems
Controls
To maximise the efficiency of operation Stokvis supply a range
of fully integrated control packages to suit each application.
Units are supplied fully wired and complete with all starters
and contactors etc, plus time and temperature control via an
integral Trend controller.
Optimised start and stop is included as standard and controls
are password protected to prevent unauthorised adjustment.
For smaller systems a SmartCom control panel may be used
instead of the Trend control to provide simple user-friendly
control with a comprehensive range of features.
The units are also fully compatible with BMS systems and
alternative BMS Controls maybe integrated within the control
strategy.
Applications
• Aircraft hangars
• Arenas and exhibition halls
• Factory heating and ventilation
• Localised air replacement for booths and extract booths
• Make-up air for buildings with mechanical exhaust
• Sports halls
• Swimming pool hall heating and condensation control
• Warehouse and distribution centre heating
DIRECT FIRED TECHNICAL DATA
MODEL Std burner size
minimum kW
output
Std burner size
maximum kW
output
Minimum air flow
m3/s
Maximum air flow
m3/s
SDF1 MUA VAV 26 0.51 0.86
SDF2 MUA VAV 53 66 1.03 1.41
SDF3 MUA VAV 66 132 1.79 2.82
SDF4 MUA VAV REC 92 198 2.57 4.00
SDF5 MUA VAV REC 132 264 3.85 5.13
SDF7 MUA VAV REC 198 330 5.13 7.00
SDF9 MUA VAV REC 264 462 6.42 9.00
SDF11 MUA VAV REC 264 594 8.98 11.55
SDF14 MUA VAV REC 396 660 10.27 1400
SDF18 MUA VAV REC 462 924 14.12 18.18
SDF25 MUA VAV REC 594 1056 17.96 25.71
DIRECT FIRED MUA & VAV APPROXIMATE DIMENSIONS
MODEL MUA & VAV HORIZONTAL UNITS MUA & VAV VETICAL UNITS Outlet size
std fan
mm2
Air inlet
size h x w
mm
Aprox
weight
exc.
filters kg
Height
mm
Width mm Length
mm
Length
C/W
filters mm
Depth
mm
Depth
C/W
filters mm
Width
mm
Height
mm
SDF1 800 860 1800 2420 700 1390 860 2854 229 600 X 760 225
SDF2 800 860 1800 2420 700 1390 860 2854 322 600 X 760 250
SDF3 1100 1100 2000 2640 1000 1690 1100 3554 453 900 X 1000 300
SDF4 1350 1250 2600 3240 1250 1940 1250 3954 507 1150 X 1150 400
SDF5 1800 1500 2900 3540 1650 2340 1500 4604 638 1550 X 1500 500
SDF7 1800 1500 2900 3540 1650 2340 1500 4604 715 1550 X 1500 515
SDF9 2050 2000 3200 3840 1900 2590 2000 5354 801 1800 X 1900 900
SDF11 2050 2000 3200 3840 1900 2590 2000 5354 898 1800 X 1900 925
SDF14 2350 2200 3500 4140 2200 2930 2200 5854 1007 2100 X 2100 1200
SDF18 2500 2600 3500 4140 2350 3080 2600 6404 1130 2250 X 2500 1400
SDF25 2500 2600 3500 4140 2350 3080 2600 6404 1267 2250 X 2500 1600
MODEL REC HORIZONTAL UNITS REC VERTICAL UNITS
SDF4 1800 1500 3540 4180 1650 2340 1500 4700 507 1550 X 1400 700
SDF5 1800 1500 3540 4180 1650 2340 1500 4700 638 1550 X 1400 800
SDF7 1800 1500 3850 4490 1650 2340 1500 4700 715 1550 X 1400 900
SDF9 2050 2000 4200 4840 1900 2590 2000 5050 801 1800 X 1900 1100
SDF11 2350 2200 4280 4920 2200 2930 2200 5520 898 2060 X 2060 1350
SDF14 2350 2200 4540 5180 2200 2930 2200 5720 1007 2060 X 2060 1450
SDF18 2500 2600 4640 5280 2350 3080 2600 6020 1130 2210 X 2460 1650
SDF25 2750 2600 4880 5520 2600 3330 2600 6445 1267 2460 X 2460 1800
1 All dimensions and weights are approximate and should be confirmed with Stokvis.
2 All details are for internal units, please contact Stokvis for external unit information.
3 Filter dimensions include side access panel and/or bag filters.
4 Units will be delivered in sections to suit individual project.
5 External static pressures of up to 2000 Pa are available contact Stokvis for details of non standard units.
1 SDF-MUA are fixed volume fresh air units for Make Up Air applications, SDF-VAV models are full fresh air units complete with inverter drive to supply variable air volumes
to suit demand. SDF-REC models are complete with patented air recirculation to provide full fresh air or up to 80% recirculation air in variable proportions.
2 Each unit is available with a range of airflows and different burner sizes to give required temperature rise through the units up to a maximum of 42°C T.
3 Maximum airflow for SDF25 REC is 22.5m3/s.
4 Units may be specified to suit alternative airflows and a range of external static pressure requirements up to 400 pascals (dependent on options fitted).
For higher static pressures please consult Stokvis.
Δ
STOKVIS INDUSTRIAL BOILERS
(INTERNATIONAL) LIMITED
96R Walton Road East Molesey Surrey KT8 0DL
TELEPHONE 020 8783 3050 • FACSIMILE 020 8783 3051
Email: info@stokvisboilers.com • Website: http://www.stokvisboilers.com
EAIR 0411
ECONO-AIR
Direct/Indirect Gas Fired
Heating and Ventilation Systems
