FSL-B-ZAB+SEK

FSL-B-ZAB+SEK-4-KM/1150x670x320/C3

Under sill units for horizontal assembly on the façade

Please note:

The specification text describes an under sill ventilation unit variant with a single room control system arranged in the unit for autonomous room operation.

The supplied controllers contain the standard control parameters for operation according to our control system description.

FSL-B-ZAB+SEK supply and extract air unit with addition of secondary air - MASTER UNIT
Under sill ventilation unit TROX FSL-B-ZAB+SEK with supply and extract air function and secondary air operation, heat recovery as well as heating and cooling function for installation on an external wall below the window sill:

• Device casing made of galvanised sheet steel, cover and sheet metal connections via deep-drawn threads and stainless steel cross-head screws, all necessary internal air ducts sealed and lined, internal electrical cable penetrations sealed, exposed surfaces powder-coated (RAL 9005, jet black)
• Intake for extract air and secondary air on the top, sheet metal edges of the intake openings are formed accordingly (no sealing tape) and can be used as an additional support for the under sill trim (trim by others); closed cell sealing tape is required between the unit and the trim so as to avoid any mixing of airflows (short circuit); sealing tape is not included in the TROX supply package
• Sound- and heat-insulating lining on suction and discharge side made of mineral wool faced with glass fibre scrim (material classification A, non-combustible according to DIN 4102, T1), erosion resistant up to air velocities of 20 m/s, or closed cell insulation material
• The device meets the hygiene requirements of VDI 6022
• Levelling feet, + 40 mm
• Connection to the outdoor air and exhaust air openings (provided by others) of the façade by means of perimeter closed cell sealing tape on the rear side of the unit, b × d = 50 × 10mm; the suction and discharge resistance of the construction provided by others should not exceed 20 Pa at a nominal volume flow rate
• Use of 3 energy-saving EC centrifugal fans, supply and extract air fan classified in category SFP 1 (< 500 W/(m³/s)) according to EN 16798-3:2017-11, electrical power consumption of the entire unit at a nominal volume flow rate of 200 m³/h is <25 W, for rating of the connecting cable a power rating of 255 VA has to be considered
• Suitable for up to 5 speed levels (between 170 and 300 m³/h), signalling via device-internal single room control system, volume flow rate level correction by adjusting the control voltage subsequently possible
• Meets the requirements of EU Regulation 1253/2014 (ErP Directive)
• Integral recuperative cross flow heat exchanger (heat recovery) for heat recovery in a salt water resistant aluminium design, with high efficiency due to special plate structure, plate spacing and package length, including condensate drip tray and discharge into the condensate drip tray of the heat exchanger. Accessibility for maintenance purposes via separate service cover without removing the unit cover
• With electromotive bypass which allows an air volume flow rate to bypass the heat recovery, actuator 24 V (modulating), 100 %, signalling via device-internal single room control system
• Self-powered non-return dampers in the outdoor/exhaust air area that are integrated into the locking devices for outdoor air and exhaust air can be hinged down, and these prevent a return flow of conditioned air or undesired airflow directions when the shutoff damper device is opened and closed
• Motorised shut-off dampers in the outdoor/exhaust air area, normally closed when there is no power by means of energy storage, actuator 230 V, open/closed, signalling via device-internal single room control system
• Integral mechanical self-powered volume flow limiter type VFL, maintenance-free, pre-set to a maximum volume flow rate, without electrical external power supply for maximum limiting of the outdoor air flow rate to a pre-set value for all façade positive pressure situations. The VFL consists of the control unit with setpoint value adjustment and control mechanics. Control is mechanical self-powered with damper blade. Control spring and low-friction, silicone free cushioning element, any installation orientation and maintenance-free, high control accuracy of ±10 %, referring to the maximum in the pressure range of between 30 and 300 Pa
• Automatic switching to secondary air mode (only with an air quality sensor) if the indoor air quality (measured, for example, at the integrated CO2₂sensor) is within the limits defined beforehand
• Electrical components contained in the unit completely wired with FSL-CONTROL III, control components are integrated in the unit. Cable for connection (connection not in the TROX supply package) of the power supply (L, N, PE) with wire end ferrules led approx. 1 m out of the unit: As a transfer point to the electrical installation provided by others:
  • Supply voltage (230 V): 3 wires, 3 × 1.5 mm² (L, N, PE)
• Connection possibility for bus communication (optional), connection of control panel, etc. after opening the customer area of the controls, as a transfer point to the controls provided by others
• Rail mount terminals type Wago 260 for the connection (provided by others) of
  • Digital inputs DI
  • Digital outputs DO
  • Master-slave connection RS485
  • Central BMS connection (optional) RS485
  • Control panel
  • RJ45 socket as service access to the user interface
• The following sensors are arranged in the unit to control the single room control system (the actual room temperature is recorded at the control panel):
  • Indoor air quality sensor CO2₂
  • Supply air temperature measurement after the heat exchanger
  • Outdoor air temperature measurement in the outdoor air intake
• 4-pipe aluminium copper tube heat exchanger for air heating or air cooling, matched to project-specific data, easily removable for cleaning (depends on the connection to the main pipe - by others, not included in the TROX supply package), drainage and venting option per heating/cooling circuit, arrangement on the room side on the right. We recommend a connection to the pipe network (provided by others) with flexible hoses (not included in the TROX supply package) so that the heat exchanger can be easily removed for cleaning
• Transfer points are the manually pre-assembled control components
  • Valves in the return: transfer with G ½" external thread, flat seal
  • Lockshields in the flow: transfer with G ½" external thread, flat seal
• Easy-to-clean condensate drip tray made from galvanised sheet steel, powder-coated RAL 9005, with condensate drain Ø 12 x 1 [mm]
• Outdoor air filter as Mini Pleat filter, class ePM1 (fine dust filter):
  • Filter class to ISO 16890: ISO ePM1 65%
  • Eurovent-certified
  • ePM1 filter media made from high-quality, wet-strengthened glass fibre paper are pleated, the spacers are made from thermoplastic hot melt adhesive and ensure uniform spacing (4 mm) between the pleats
  • The frame is made from moisture-resistant non-woven fibre with lugs (for pulling it out) and must not reduce the flow cross-section (filter size = flow cross-section)
  • Filter area >= 1.6 m²
• Extract air filter class G3 (coarse dust filter) as flat filter medium, filter class according to ISO 16890: ISO coarse 55%
• Quick change of the filters is possible, since the filter insert can be opened without tools after opening the outer casing (by others) via user-friendly quarter-turn fasteners (accessibility must not be restricted by the under sill trim that is provided by others)
• Possibility of supporting a window sill provided by the customer, intake of the extract air is below the window sill, on the top of the unit
• Closed cell sealing tapes for sealing and adaptation to the outer casing provided by others (not included in the TROX supply package)
• The under sill trim provided by others (supply package by TROX possible on request) has to be perforated in areas of the radiator to be specified for the introduction of supply air into the room and must not restrict maintenance work and unit assembly/disassembly on the front of the unit. On the top of the casing, there is also a perforation in areas to be specified for extract air removal
• Clear distance between the front edge of the unit and the inner edge of the under sill trim approx. 30 mm

The front of the device must be completely accessible after disassembly of the outer casing

Units, dimensions and weight: 

• Width: approx. 1150 mm (including side setup angles)
• Height: approx. 670 mm (without seal for window sill, without height adjustment)
• Depth: approx. 320 mm (without compressible façade seal on the back of the unit)
• Weight: approx. 75 kg

FSL-CONTROL III controller

Including control system FSL-CONTROL III, as described below:

FSL-CONTROL III is described as stand-alone single room control equipment with a simple timer. Optional expansions, such as connection to the on-site central BMS via Modbus TCP / Modbus RTU, BACnet MS/TP or BACnet IP, humidity sensors, return flow temperature sensors, electromotive valve actuators or pressure-independent control valves are included in the product range, but must be replaced with the standard components in the following description. A room temperature signal is also required. Various room control panels and sensors are available for this purpose. The corresponding optional equipment text modules can be found in the appendix of the following standard equipment for room-autonomous operation. We recommend commissioning by our technical service. You will find related text modules below.

TROX control module FSL-CONTROL III (order code ...-C3-MA ...):

• Single room controller for mounting on DIN mounting rail in the unit or in a separate control casing
• 42 digital or analogue inputs and outputs
• A MicroSD card with min. 2 GB storage space is integrated as a flash storage medium. The trend data is stored here and can be accessed via the RJ45 service socket.
• Equipped at the factory with a software package for master units specially developed for decentralised ventilation units. The software enables simple master-slave communication via Modbus RTU
• Up to 10 slave devices can be connected to one master device
• The software provides 3 types of operation (Off, Automatic and Manual), 3 operating modes (Occupied, Unoccupied and Standby) and 4 operating mode overrides (Boost, Class, Night Ventilation and Fan Forced Circuit)
• Basic distinction between room temperature control by controlling heating and cooling valves or modulating bypass damper or supply air temperature control for isothermal ventilation
• CO₂-guided air quality control
• Year-round heat recovery use
• Filter monitoring
• Configurable DI, e.g. for connection (by others) of PIR sensor, window contacts, holiday switching, etc.
• Alarm signals type A (= switch-offs) and type B (= notifications)

Real time clock (RTC)

Real Time Clock (RTC/real time clock) (order code ...-T/...):

• Component of the Master Software Package
• Enables a simple timer
• 7 days with 10 switching points each
• Automatic summer / winter time changeover
• Temporal activation of night purge

CO2 sensor

CO2₂sensor (order code…/C/…):

•  Sensor arranged in the extract air intake of the master unit for recording the indoor air quality and corresponding control of the outdoor air flow rate
• Measurement via an NDIR sensor, which works on an infrared basis and compensates for any contamination by its 2-beam measurement principle
• Measuring range 0 – 2000 ppm

Supply air temperature sensor

Supply air temperature sensor (order code .../Z/...):

• Supply air temperature sensor with NTC thermistor as sensing element, resistance 10 kΩ at 25 °C, measuring range 0 – 50 °C
• Especially fast response time due to perforated measuring tip

Outdoor air temperature sensor

Outdoor air temperature sensor (order code .../A/...):

• Outdoor air temperature sensor with NTC thermistor as sensing element, resistance 10 kΩ at 25 °C, measuring range -30 – 50 °C

Water side components

Water-side components (order code…/HV-R-…/KV-R-…):

• Valve actuators: 2 x thermoelectric actuators for opening and closing valves, with position indicator, including pluggable power rating, supply voltage 24V DC, control voltage 0-10V DC, power consumption 1 W, protection level: IP 54
• Straight-way valves: 2 x straight-way valves ½" standard, manually preassembled, PN 16, DN 10, kvs 0.4 (alternatively 0.25, 0.63 or 1.0 m³/h - please state the required kvs value), threaded connection G 1/2B, operating fluid temperature 1 to 110 °C
• Lockshields: 2 x lockshields on both sides ½", manually preassembled, nominal width DN 15; ½ inch, valve casing straight through with male thread on both sides, flat seal, for regulation and shut-off, operating temperature max. 120 °C

Optional control accessories

Optional equipment to increase the comfort of the FSL-CONTROL III:

TROX control panels for FSL-CONTROL III:

At least one room temperature signal is required per room. 
There are different variants of TROX control panels available, optionally with or without step switching. 
Additionally we offer a room temperature sensor RTF without control elements.
Alternative control panels provided by the customer must be connected via bus communication.

Control panels with selector switch for surface mounting

Control panel with selector switch, for surface mounting, type Honeywell

Supplied loose as accessory, with room temperature sensor, setpoint adjuster (blue or white), override button, LED and 3-step switch as well as off and automatic, assembly on 60 mm flush box or directly on the wall, NTC thermistor as sensor element, resistance 20 kΩ at 25 °C, dimensions (B x H x T): 99 x 104 x 30 mm, operating temperature: 6 to 40 °C

Control panel with selector switch, for surface mounting, type Thermokon

Supplied loose as an accessory, with room temperature sensor, setpoint adjuster (blue or white), override button, LED and 3-step switch as well as off and automatic, casing made from pure white PVC0 (RAL 9010) assembly on 60 mm flush box or directly on the wall, NTC thermistor as sensor element, resistance 20 kΩ at 25 °C, dimensions (B x H x T): 84.5 x 84.5 x 25 mm, operating temperature: -35 to 70 °C

Control panels without selector switch for surface mounting

Control panel without selector switch, for surface mounting, type Schneider

Supplied loose as additional part, with mode display, push button and setpoint adjustment, sensor NTC 10 kΩ, protection level: IP 20, wall mounting or on 70 mm flush-mounted box, dimensions (B x H x T) 84 x 116 x 24 mm, colour light grey/white

Control panel without selector switch, for surface mounting, type Thermokon

Supplied loose as additional part, with mode display, push button and setpoint adjustment, sensor NTC 20 kΩ, protection level: IP 20, dimensions (B x H x T) 84.5 x 84.5 x 25 mm

Room temperature sensor for surface mounting

Room temperature sensor TROX RTF, surface mounting

Supplied loose as additional part, room sensor without control elements, measuring range: -35...+70°C, sensor NTC 10 kΩ, terminal screw terminal, d=1.5 mm, protection level IP 20, assembly wall mounted or on 70 mm flush-mounted box, dimensions (B x H x T) 85 x 85 x 30 mm, casing ABS in RAL 9010

Control panels without selector switch for surface mounting
For manual operation of the ventilation units with a high-quality look and the matching design frame from a wide range of switch ranges, the unit is suitable for particularly design-oriented facilities.

Control panel without selector switch, for flush mounting, type Thermokon, switch from Berker S.1 range, polar white

Supplied loose as additional part, with mode display, push button and setpoint adjustment, sensor NTC 20 kΩ, protection level: IP 20

Control panel without selector switch, for flush mounting, type Thermokon, switch from Berker Q.3 range, white

Supplied loose as additional part, with mode display, push button and setpoint adjustment, sensor NTC 20 kΩ, protection level: IP 20

Control panel without selector switch, for flush mounting, type Thermokon, switch from Busch Jäger future linear range, white

Supplied loose as additional part, with mode display, push button and setpoint adjustment, sensor NTC 20 kΩ, protection level: IP 20

Further switch programmes on request!

Control panels without selector switch and without setpoint value adjuster for flush mounting

Control panel without selector switch and without setpoint value adjuster, for flush mounting, type Thermokon, switch from Gira E2 range

Supplied loose as additional part, with mode display and button, sensor NTC 20 kΩ, protection level: IP 20

Further switch programmes on request!

Electromotive valve actuator:
As an alternative to the standard installed thermoelectric actuator:

• 2 x electromotive actuators for opening and closing valves, supply voltage AC/DC 24 V, maximum power consumption 2.5 VA, signalling of control signal 3-point DC 0 – 10 V, permitted operating fluid temperature 1 – 110 °C

Pressure-independent control valve:
As an alternative to the standard installed straight-way small valve:

• 2 x pressure-independent control valves, manually pre-assembled with modulating open and close control in combination with an externally adjustable dynamic volume flow controller, with full valve authority, nominal width DN 10, ½ inch, valve casing straight through with male thread on both ends, flat seal, operating fluid temperature 0 - 120 °C

Interface for connection to central building management system (BMS) provided by others:

Modbus TCP interface including web server (order code .../MT/...)
To increase comfort, we recommend integration into a central building management system provided by others. FSL-CONTROL III offers the possibility to be connected to a central BMS provided by others using Modbus TCP protocol. Additionally incl. web server for simplified configuration, commissioning and remote monitoring of the device. The central BMS is not included in the supply package from TROX, only the interfaces listed above are available here.

• Modbus TCP interface (Ethernet)

BACnet IP interface including web server (order code .../BI/...):
To increase comfort, we recommend integration into a central building management system provided by others. FSL-CONTROL III offers the possibility to be connected to a central BMS provided by others using BACnet IP protocol. Additionally incl. web server for simplified configuration, commissioning and remote monitoring of the device. The central BMS is not included in the supply package from TROX, only the interfaces listed above are available here.

• BACnet IP interface (Ethernet)

Modbus RTU (order code .../MR/...):
To increase comfort, we recommend integration into a central building management system provided by others. FSL-CONTROL III offers the possibility to be connected to a central BMS provided by others using Modbus RTU protocol. The central BMS is not included in the supply package from TROX, only the interfaces listed above are available here.

• Modbus RTU interface (RS485)

BACnet MS/TP (order code .../BM/...):
To increase comfort, we recommend integration into a central building management system provided by others. FSL-CONTROL III offers the possibility to be connected to a central BMS provided by others using BACnet MS/TP. The central BMS is not included in the supply package from TROX, only the interfaces listed above are available here.

• BACnet MS/TP interface (RS485)

Commissioning of the decentralised ventilation units

Commissioning / parameter setting of decentralised ventilation units without connection to the central building management system

• Visual inspection of the unit connections carried out by others for compliance with the respective installation specifications from the installation and configuration instructions: air connections, heating/cooling connection, electrical connections, integration into the installed unit casing, connections of external participants.
• Checking and, if necessary, adapting the project parameters pre-set in the factory with regard to customer-specific adaptations
• Functional test of the individual components (actuators, fans, valves, dampers, sensors)
• Checking the project-specific control functions including any special functions such as potential-free switch contacts
• Documentation of the device settings, as well as their use in a service report. The service report must be signed by your company as the customer or your representative
• The invoice is made as a flat rate, derived from the number of devices and distance

Commissioning / parameter setting of decentralised ventilation units with connection to the central building management system

• Visual inspection of the unit connections carried out by others for compliance with the respective installation specifications from the installation and configuration instructions: air connections, heating/cooling connection, electrical connections, integration into the installed unit casing, connections of external participants, central building management system connections
• Checking and, if necessary, adapting the project parameters pre-set in the factory with regard to customer-specific adaptations
• Functional test of the individual components (actuators, fans, valves, dampers, sensors)
• Checking the project-specific control functions including any special functions such as potential-free switch contacts
• Function test of the communication to the central BMS in cooperation with the ordered controls company:
• Check that the settings that are provided by others comply with the specifications in the installation and configuration instructions
• Input test of the data points sent by the customer
• Output test of the output data points
• Trial operation of the operating conditions switchable by the central BMS
• Documentation of the device settings, as well as their use in a service report. The service report must be signed by your company as the customer or your representative
• The invoice is made as a flat rate, derived from the number of devices and distance

Instruction in operation and maintenance

• One-off instruction for the operation of the decentralised ventilation units consisting of:
• Description of the equipment functions on the unit that has already been put into operation
• Description of the room control panel and the room conditions that can be influenced by it
• Description of maintenance work
• The invoice is a flat rate and is carried out by the responsible sales representative

MR With Modbus RTU
BI With BACnet IP
BM With BACnet MS/TP 

9 Air quality sensor, only master
No entry required: None
C With CO₂sensor
V With VOC sensor 

10 Supply air temperature sensor
Z With 

11 outdoor air temperature sensor, only master
No entry required: None
A With 

12 Heating valve
HV With 

13 Lockshield – heating circuit
R With 

14 kVS value heating valve
0.25 Straight-way valve
0.40 Straight-way valve
0.63 Straight-way valve
1.00 Straight-way valve
F0.50 Pressure-independent control valve 

15 Cooling valve
Only 4-pipe systems
KV With 

16 Lockshield – cooling circuit
R With 

17 kVS valve – cooling valve
0.25 Straight-way valve
0.40 Straight-way valve
0.63 Straight-way valve
1.00 Straight-way valve
F0.50 Pressure-independent control valve