SCHOOLAIR-B-HE

SCHOOLAIR-B-HE (example of 2-pipe construction – active heating)

SCHOOLAIR-B-HE (example 2-pipe construction – isothermal supply air)

SCHOOLAIR-B-HE (example of 4-pipe construction)

SCHOOLAIR-B-HE-2/KM/2090×750×420/C3

Under sill units for assembly horizontally on the façade

Please note:
The described under sill ventilation unit variant is equipped with a single room control system arranged in the unit.

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

School ventilation unit – under sill installation – MASTER UNIT
Under sill ventilation unit TROX SCHOOLAIR-B-HE with supply and extract air function and switchover to secondary air mode (depending on air quality), cross-counterflow heat recovery that can be used all year round as well as heating function, for installation on an external wall below the window sill:

• Unit 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 coated (RAL 9005, jet black)
• Sound and heat insulating lining on intake and discharge side made of mineral wool faced with glass fibre scrim or closed cell insulation material
• The device meets the hygiene requirements of VDI 6022
• Levelling feet, +40 mm
• Slotted brackets on both sides for fixing to the wall or sill
• Connection to the outdoor air and exhaust air openings (provided by others) in the façade by means of perimeter closed cell sealing tape on the rear side of the unit, the intake and discharge resistance of the construction provided by others should not exceed 20 Pa at a nominal volume flow rate
• Use of 2 energy-saving EC centrifugal fans, supply and extract air fans 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 300 m³/h < 80 W, for the connecting cable a power rating of 547 VA has to be considered
• The technical requirements of EU directive 1253/2014 for non-residential ventilation systems are fulfilled and documented in accordance with the directive
• Suitable for 3 speed levels (150, 225 and 300 m³/h as well as boost level with 400 m³/h), signalling via device-internal single room control system, volume flow rate level correction by adjusting the control voltage is possible
• Integral heat exchanger for heat recovery (cross-counterflow heat recovery unit) with high efficiency (heat recovery efficiency 88%), including condensate collection and drainage. The unit's internal control offers year-round use of heat recovery, even at very low temperatures. This helps to reduce the available water-side heating capacity. A connection to a condensate pipe is required when you use this function! A separate service opening allows for maintenance without removing the top of the unit casing
• With electromotive bypass which allows a partial air volume flow to bypass the heat recovery, actuator 24 V (modulating), signalling via internal single room control system
• Motorised shut-off dampers in outdoor/exhaust air areas, closed when there is no power in inactive state (open - close), control via internal single room control system
• Electrical components contained in the unit are completely wired with FSL-CONTROL III, control components are integrated in the unit. Cable for connection (connection not supplied by TROX) 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
    • 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 CO₂
  • Supply air temperature measurement downstream of the heat exchanger
  • Outdoor air temperature measurement in the outdoor air intake
  • 2-pipe heat exchanger for air heating easily removable for cleaning, can be emptied and vented in heating circuits. We recommend using flexible hoses to connect the unit to the pipework provided by others as they facilitate removal of the heat exchanger for cleaning
• The transfer point of the heat exchanger are the union nuts on which the control components (valve including actuator in the flow line, lockshield in the return line) are manually preassembled
• Easy-to-clean condensate drip tray with condensate drain (12 x 1mm) made of galvanised sheet steel, powder-coated (RAL 9005, jet black)
• Outdoor air filter as Mini Pleat filter class ePM1 (fine dust filter):
  • Filter class to ISO16890: 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 of 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 >= 4.60 m²
• Extract air filter class G3 (coarse dust filter) as flat filter medium, filter class according to ISO16890: ISO coarse 55%
• Filters can be changed quickly, as the filter drawer can be opened without tools via user-friendly quick-release fasteners after opening the outer casing provided by others (access to the entire front of the unit 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 below the window sill is on the upper side of the unit, sealing tapes for sealing and adaptation to the window sill / under sill trim provided by the customer (partitioning panel not included in the TROX supply package) using closed-cell sealing tapes
• The under sill trim provided by the customer is 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

Units – dimensions and weight:
Width: approx. 2090 mm (without levelling feet and fixing brackets)
Height: ca. 750 mm (levelling feet to top edge of unit, without space for extract air intake)
Depth: approx. 420 mm (without façade sealing)
Weight: approx. 115 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 central BMS provided by others 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 micro SD card with up to 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 opening/closing 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
• Filter monitoring
• Configurable DI, e.g. for connection (by others) of PIR sensors, 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/...):

• 7 days with 10 switching points each
• Automatic summer / winter time changeover
• Temporal activation of night purge

CO2 sensor

CO₂ sensor (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 actuator: 1 × thermoelectric actuator for opening and closing valves, with position indicator, including pluggable power rating, supply voltage 24 V DC, control voltage 0 – 10 V DC, power consumption 1 W, degree of protection: IP 54
• Straight-way valve: 1 × small straight-way valve ½" as standard, pre-assembled hand-tight, PN 16, nominal width 10, k_VS 0.4 (alternatively: 0.25, 0.63 or 1.0 m³/h – please specify the required k_VS value), threaded connection G 1/2B, fluid temperature 1 - 110 °C
• Lockshields: 1x lockshield on both sides ½", manually pre-assembled, nominal width DN 15; ½ inch, valve body straight through with male thread on both sides, flat seal, for flow restriction and shut-off, operating temperature maximal 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, installation 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 - 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) installation 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 – 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 × 84.5 × 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, screw terminal, d = 1.5 mm, protection level IP 20, for mounting on the face of the wall 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 flush mounting:

For manual operation of the ventilation units with a high-quality look and the matching design frame from a wide range of switch programmes, 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 class: IP 20

Further switch programmes on request

Electromotive valve actuator:

As an alternative to the standard installed thermoelectric actuator

• 1 x electromotive actuator 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, permissible fluid temperature 1...110 °C

Pressure independent control valve:

As an alternative to the standard installed straight-way small valve

• 1 x pressure-independent control valve, 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, 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 outer casing, connections of external devices
• 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 volt-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 and configuration instructions: air connections, heating/cooling connection, electrical connections, integration into the outer casing, connections of external devices, 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 volt-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