FSL-B-ZAB/SEK

Supply and extract air unit with heat exchanger and heat recovery, secondary air option, for installation under the sill

Ready-to-operate decentralised ventilation unit that provides good comfort levels, used for the ventilation and extract ventilation of rooms

  • Acoustically optimised EC fans with low specific fan powers, SFP-1 according to EN 13779
  • Plate heat exchanger for heat recovery (air/air), including bypass damper with electric actuator (open-close)
  • Heat exchanger for heating and cooling as 2-pipe or 4-pipe system
  • Reduction of fine dust and pollen contamination due to integral filters that conform to VDI 6022 – F7 fresh air filter and G3 extract air filter
  • Inspection panel simplifies filter change and cleaning of the heat exchanger
  • Condensate drip tray with condensate drain
  • Motorised shut-off dampers, normally closed (NC)
  • Automatic switching to secondary air mode (based on air quality)


Optional equipment and accessories

  • Modular control system FSL-CONTROL II, specially for decentralised ventilation systems
  • Demand-based fresh air volume, free cooling and night purge, depending on control strategy
  • Various fixing systems to fix the unit to the floor or wall
  • Variable heat recovery
  • Powder-coated RAL 9005

FSL-B-ZAB/SEK 00256001_0


  • Application
  • Description

Application

  • Ventilation of rooms, preferably rooms with a depth up to 6 m
  • 2-pipe or 4-pipe heat exchangers enable good comfort levels
  • Inducing displacement flow
  • Energy-efficient solution since water is used for heating and cooling
  • For new buildings, refurbishment projects and revitalisation projects
  • Installation under the sill
  • Typical installation locations include offices and meeting rooms

Special characteristics

  • Recuperative heat exchanger for heat recovery, including bypass damper with variable electric actuator (open-close)
  • Mechanical self-powered volume flow controller for limiting the fresh air flow rate
  • Heat exchanger as 2-pipe or 4-pipe system, with G½" union nuts and flat seals
  • Meets the hygiene requirements of VDI 6022
  • Filter class: F7 for fresh air, G3 for extract air
  • Easy filter change with quick release fasteners, no tools required; easy access to the heat exchanger for cleaning
  • Condensate drip tray with condensate drain
  • Compact construction, hence particularly suitable for refurbishment projects
  • Demand-based ventilation is possible by means of monitoring the room air quality and with dedicated control equipment
  • 4 levelling feet
  • Motorised shut-off dampers for fresh air and exhaust air, normally closed (NC) in order to prevent uncontrolled airflows and the carry over of smoke
  • Automatic switching to secondary air mode (only with an air quality sensor) if the room air quality (measured with the integral VOC sensor, for example) is between the previously defined range. The fresh air damper closes, the self-powered secondary air damper opens and the extract air fan is switched off. The unit always starts in secondary air mode, which is more energy efficient.

Nominal sizes

  • 1085 × 630 × 320 mm (B × H × T)

Construction

  • Powder-coated RAL 9005, black

Useful additions

  • Modular control system FSL-CONTROL II, specially for decentralised ventilation systems
  • Connecting hoses

Construction features

  • 2 energy-efficient EC fans with low specific fan powers, SFP = 1 according to EN 13779
  • Cross flow plate heat exchanger
  • The supply air is discharged to the room as an inducing displacement flow from the lower front part of the unit
  • Extract air or secondary air is taken in to the upper part of the unit

Materials and surfaces

  • Casing, filter chamber cover, fans and levelling feet are made of galvanised sheet steel
  • Heat exchanger with copper tubes and aluminium fins
  • Plate heat exchanger made of aluminium
  • Casing powder-coated, black (RAL 9005)
  • F7 filter medium made of moisture-resistant glass fibre paper (certified by Eurovent)
  • Mineral wool lining to DIN 4102, fire rating class A, faced with glass fibre fabric as a protection against erosion, effective with airflow velocities up to 20 m/s
  • Closed cell sealing strips

Standards and guidelines

  • Façade ventilation units of Type FSL-B-ZAB/SEK conform to VDI 6035 and VDMA 24390
  • Hygiene certificate to VDI 6022
  • Heating/cooling fluid conforms to VDI 2035
  • Meets the requirements of EU directive 1253/2014 (ErP).
  • Energy efficiency class A

Maintenance

  • VDI 6022, Part 1, applies (Hygiene requirements for ventilation and air-conditioning systems and units)
  • The heat exchanger can be vacuumed with an industrial vacuum cleaner if necessary
  • It can also be cleaned with commercial, non-aggressive cleaning agents

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code

Functional description

Decentralised supply and extract air units for room ventilation and for dissipating cooling loads and heat loads.

An EC centrifugal fan takes in the fresh air which then flows through the motorised shut-off damper, the volume flow controller and the F7 filter.

Once the fresh air has passed the fan, it flows through the recuperative heat exchanger for heat recovery; it is possible to bypass the recuperative heat exchanger in order to protect it, or when it is sensible with regard to energy efficiency.

If necessary, the air is heated or cooled by the heat exchanger before it is discharged to the room as a displacement flow.

The extract air first passes a G3 filter, then flows through the heat exchanger (for heat recovery), the extract air fan and the motorised shut-off damper before it is discharged to the outside as exhaust air.

Automatic switching to secondary air mode (only with an air quality sensor) if the room air quality is sufficient.

The fresh air damper closes, the self-powered secondary air damper opens and the extract air fan is switched off.

The unit always starts in secondary air mode, which is more energy efficient.

Width

1085 mm

Height

630 mm

Depth

320 mm

Fresh air flow rate

Up to 150 m³/h

Supply air flow rate

Up to 150 m³/h

Cooling capacity

Up to 690 W

Heating capacity

Up to 2600 W

Room cooling capacity

Up to 400 W

Room heating capacity

Up to 1000 W

Max. operating pressure, water side

6 bar

Max. operating temperature

75 °C

Sound power level

31 – 43 dB(A)

Supply voltage

230 V AC ±10 %, 50/60 Hz


FSL-B-ZAB/SEK (sizing examples)

Supply air flow rate

m³/h

80

100

120

Fresh air flow rate

m³/h

80

100

120

Total cooling capacity

W

360

460

550

Room cooling capacity

W

216

271

329

Temperature of the air in the unit

°C

32.0

32.0

32.0

Relative humidity

%

40.0

40.0

40.0

Water content of the dry air

g/kg

11.9

11.9

11.9

Supply air temperature

°C

17.9

17.9

17.8

Condensation

g/h

0

0

0

Chilled water flow rate

l/h

100

130

170

Water temperature, inlet

°C

16

16

16

Water temperature, outlet

°C

19.1

19.0

18.8

Pressure drop – water side

kPa

<3

<3

<3

Total heating capacity

W

1500

1830

2140

Room heating capacity

W

446

521

573

Temperature of the air in the unit

°C

–12.0

–12.0

–12.0

Supply air temperature

°C

37.7

36.6

35.3

Hot water flow rate

l/h

90

130

170

Water temperature, inlet

°C

60

60

60

Water temperature, outlet

°C

45.4

47.7

49.0

Pressure drop – water side

kPa

<3

<3

<3

Sound power level LWA

dB(A)

30

34

38

Sound pressure level with 8 dB system attenuation

dB(A)

22

26

30


Decentralised supply and extract air units of Type FSL-B-ZAB/SEK, with heat recovery and heat exchanger, for installation under the sill or on the façade system.

Special characteristics

  • Recuperative heat exchanger for heat recovery, including bypass damper with variable electric actuator (open-close)
  • Mechanical self-powered volume flow controller for limiting the fresh air flow rate
  • Heat exchanger as 2-pipe or 4-pipe system, with G½" union nuts and flat seals
  • Meets the hygiene requirements of VDI 6022
  • Filter class: F7 for fresh air, G3 for extract air
  • Easy filter change with quick release fasteners, no tools required; easy access to the heat exchanger for cleaning
  • Condensate drip tray with condensate drain
  • Compact construction, hence particularly suitable for refurbishment projects
  • Demand-based ventilation is possible by means of monitoring the room air quality and with dedicated control equipment
  • 4 levelling feet
  • Motorised shut-off dampers for fresh air and exhaust air, normally closed (NC) in order to prevent uncontrolled airflows and the carry over of smoke
  • Automatic switching to secondary air mode (only with an air quality sensor) if the room air quality (measured with the integral VOC sensor, for example) is between the previously defined range. The fresh air damper closes, the self-powered secondary air damper opens and the extract air fan is switched off. The unit always starts in secondary air mode, which is more energy efficient.

Materials and surfaces

  • Casing, filter chamber cover, fans and levelling feet are made of galvanised sheet steel
  • Heat exchanger with copper tubes and aluminium fins
  • Plate heat exchanger made of aluminium
  • Casing powder-coated, black (RAL 9005)
  • F7 filter medium made of moisture-resistant glass fibre paper (certified by Eurovent)
  • Mineral wool lining to DIN 4102, fire rating class A, faced with glass fibre fabric as a protection against erosion, effective with airflow velocities up to 20 m/s
  • Closed cell sealing strips

Construction

  • Powder-coated RAL 9005, black

Technical data

  • Width: 1085 mm
  • Height: 630 mm
  • Depth: 320 mm
  • Fresh air flow rate: up to 150 m³/h
  • Supply air flow rate: up to 150 m³/h
  • Cooling capacity: up to 690 W
  • Heating capacity: up to 2600 W
  • Room cooling capacity: up to 400 W
  • Room heating capacity: up to 1000 W
  • Max. operating pressure: 6 bar
  • Max. operating temperature: 75 °C
  • Sound power level: 31 – 43 dB(A)
  • Supply voltage: 230 V AC ±10 %, 50/60 Hz
  • Rating: up to 80 VA
  • Power consumption: up to 53 W with boost level, up to 23 W with medium speed (nominal volume flow rate)

Sizing data

Fresh air

  • V_________________[m³/h]

Supply air

  • V_________________[m³/h]

Room cooling capacity

  • Q_________________[W]

Room heating capacity

  • Q_________________[W]


  • LWA_______________[dB(A)]

00248570_0

 Type
FSL-B-ZAB/SEK       Decentralised under sill ventilation units

 Heat exchanger
2       2-pipe
4       4-pipe

 Condensate drip tray
KM       With condensate drain

 Dimensions [mm]
       B × H × T
1085 × 630 × 320

 Control equipment
       No entry: none
R       With

 Control function
MA       Master (room module and control module)
SL       Slave (control module)

 Real time clock
       No entry: none
       master only
T       With

 Interface
       No entry: none
       master only
B       BACnet MS/TP or Modbus RTU
L       LonWorks LON-FTT10

 

 Air quality sensor
       No entry: none
       master only
V       VOC sensor

 Supply air temperature sensor
Z       With

 Fresh air temperature sensor
       No entry: none
       master only
A       With

 Heating valve
HV       With

 Lockshield – heating circuit
R       With

 kVS value – heating valve
0,25
0,40
0,63
1,00
F0,50

 Cooling valve
       For 4-pipe systems only
KV       with

 Lockshield – cooling circuit
R       With

 kVS value – cooling valve
0,25
0,40
0,63
1,00
F0,50

Decentralised ventilation units are technically advanced products of high quality; they offer a wide range of configuration options. For specification details regarding your project please contact your nearest TROX branch or subsidiary.

 

Variants, Dimensions and weight

  • Variants
  • Dimensions and weight
FSL-B-ZAB/SEK, dimensions 00248356_0


Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Under sill installation either standing on the floor or hanging on the wall
  • Level adjustment using the 4 levelling feet (+40 mm)
  • The fresh air connection is provided by two ventilation openings in the façade system or external wall (to be provided by others)
  • Weather protection for the fresh air and exhaust air openings to be provided by others
  • Installation and connections to be performed by others; fixing, connection and sealing material to be provided by others
  • The water flow and return connections are on the right-hand side of the unit when seen from the room
  • Vents and drainage by others
  • We recommend using flexible hoses to connect the unit to the pipework as they facilitate removing the heat exchanger for cleaning.
  • The under sill trim must not obstruct installation or deinstallation of the unit or maintenance access on the front of the unit

LN [mm]

Nominal length

LWA [dB(A)]

Sound power level

tPr [°C]

Primary air temperature

tWV [C°]

Water flow temperature – cooling/heating

tR [C°]

Room temperature

tR [C°]

Room temperature

tAN [C°]

Secondary air intake temperature

QPr [W]

Thermal output – primary air

Qtot [W]

Thermal output – total

QW [W]

Thermal output – water side, cooling/heating

VPr [l/s]

Primary air volume flow rate

VPr [m³/h]

Primary air volume flow rate

VW [l/h]

Water flow rate – cooling/heating

V [l/h]

Volume flow rate

∆tW [K]

Temperature difference – water

∆pW [kPa]

Pressure drop, water side

∆pt [Pa]

Total pressure drop, air side

∆tPr = tPr - tR [K]

Difference between primary air temperature and room temperature

∆tRWV = tWV - tR [K]

Difference between water flow temperature and room temperature

∆tWm-Ref [K]

Difference between mean water temperature and reference temperature

LN [mm]

Nominal length

Inducing displacement flow

The supply air is discharged near the external wall and with a medium velocity between 1.0 and 1.5 m/s. Due to the induction effect the supply air velocity is rapidly reduced such that, in cooling mode, the supply air displaces the room air over the entire floor area. The convection from people and other heat sources causes the fresh air from the pool to rise and create comfortable conditions in the occupied zone.

Heat exchanger

The maximum water-side operating pressure for all heat exchangers is 6 bar.

The maximum water flow temperature (heating circuit) for all heat exchangers is 75 °C; if flexible hoses are used, the water flow temperature should not exceed 55 °C. Units for other pressures and temperatures are available on request.

The water flow temperature (cooling circuit) should be at least 16 °C such that it does not permanently fall below the dew point. For units with a condensate drip tray the water flow temperature may be reduced to 15 °C.

Heat exchanger as 2-pipe system

Air-water systems with a 2-pipe heat exchanger may be used for either heating or cooling. In changeover mode it is possible to use all units within a water circuit exclusively for cooling in summer and exclusively for heating in winter.

Heat exchanger as 4-pipe system

Air-water systems with a 4-pipe heat exchanger may be used for both heating and cooling. Depending on the season, i.e. especially in spring and autumn, it may be possible that an office has to be heated in the morning and cooled in the afternoon.

References

Installation example FSL-B-ZAB

slide_1
  • Product Information

Type FSL-B-ZAB
Supply and extract air unit with heat exchanger and heat recovery, secondary air option, for installation under the sill

Ready-to-operate decentralised ventilation unit that provides good comfort levels, used for the ventilation and extract ventilation of rooms

  • Acoustically optimised EC fans with low specific fan powers, SFP-1 according to EN 13779
  • Plate heat exchanger for heat recovery (air/air), including bypass damper with electric actuator (open-close)
  • Heat exchanger for heating and cooling as 2-pipe or 4-pipe system
  • Reduction of fine dust and pollen contamination due to integral filters that conform to VDI 6022 – F7 fresh air filter and G3 extract air filter
  • Inspection panel simplifies filter change and cleaning of the heat exchanger
  • Condensate drip tray with condensate drain
  • Motorised shut-off dampers, normally closed (NC)
  • Automatic switching to secondary air mode (based on air quality)



Optional equipment and accessories

  • Modular control system FSL-CONTROL II, specially for decentralised ventilation systems
  • Demand-based fresh air volume, free cooling and night purge, depending on control strategy
  • Various fixing systems to fix the unit to the floor or wall
  • Variable heat recovery
  • Powder-coated RAL 9005


For further product information please click here


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Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +44 (0)1842 754545 | Fax: +44 (0)1842 763051