X-CUBE SCHOOLAIR-V-2L

Tested to VDI 6022

Cross flow heat recovery unit

Water connections

Filter change

Levelling foot

X-CUBE SCHOOLAIR-V-2L

Supply and extract air unit for vertical installation on the façade

Ready-to-connect decentralised ventilation unit for comfortable room temperature control and supply and extract ventilation of rooms such as classrooms, meeting rooms and day-care centres
■ Installation possible during normal school operation
■ Acoustically optimised EC fans with low specific fan power, according to DIN EN 16798-3 SFP = 0
■ Switch-over option to secondary air mode
■ Reduction of fine dust and pollen through integrated air filters in accordance with VDI 6022 – filter class ISO ePM1 65% and extract air ISO coarse 75%
■ Tool-free filter replacement
■ Cross flow heat recovery unit
■ Optional year-round heat recovery operation
■ Highly efficient heat exchanger for heating or cooling as a 2-pipe system
■ Heat exchanger connection on the right-hand side, when viewed from the room
■ Condensate drip tray with or without condensate drain connection
■ Motorised shut-off dampers, normally closed

Optional equipment and accessories
■ Control system FSL-CONTROL III, specially designed and modularly constructed for decentralised ventilation systems
■ Wood panelling in various colours, including TROX ventilation grilles for supply and extract air (self-assembly kit)

Technical information

1 Outdoor air temperature sensor (optional)
2 Shut-off damper with actuator (exhaust air and outdoor air)
3 Outdoor air filter ISO ePM1
4 Fan (supply air and extract air)
5 Recuperative cross flow plate heat exchanger
6 Sound attenuator
7 Heating coil
8 Cooling coil (only SCHOOLAIR-V-4)
9 Supply air temperature sensor
10 Bypass damper with actuator
11 CO2 sensor (optional)
12 Extract air filter ISO coarse
SEH Single room exhaust air
SET Single room extract air
SRO Single room outdoor air
SRS Single room supply air
SEC Secondary air (optional)

Functional description
Decentralised supply and extract air units ventilate the room and cover the cooling and heating loads in accordance with the technical data. An EC centrifugal fan draws in the outdoor air, which flows through the motorised shut-off damper and the outdoor air filter. The outdoor air then passes through the crossflow heat recovery unit, which can be switched off under operating conditions where heat recovery is not required. If required, the air is heated by the heat exchanger before being discharged into the room as a displacement flow. The extract air passes through the extract air filter, before being discharged to the outside as exhaust air, via the cross-flow heat recovery unit, the extract air fan and the motorised shut-off damper. If the indoor air quality is adequate, the FSL-CONTROL III control system switches to energy-efficient secondary air mode by closing the outdoor air dampers. The control system compares the room air quality setpoints to the actual values measured by the CO2 sensor and switches automatically between outdoor air and secondary air operation. In case of a power failure, the outdoor air and exhaust air dampers are closed to ensure fire protection, frost protection, and to avoid draughts. This function is ensured by a capacitor in each actuator. The supply air flows into the room close to the façade at an average velocity of 0.5 – 0.8 m/s. As a result of the induction effect, the air velocity is rapidly reduced shortly after the air enters the room. As a result, in cooling mode the supply air spreads across the entire floor area as displacement flow. At heat sources such as people or equipment, natural convection creates a buoyant airflow, so that air exchange primarily occurs in these areas.

Width	397 mm
Height	2160 mm
Depth	359 mm
Volume flow rate	150, 200, 250 m³/h (boost 320 m³/h)
nominal volume flow rate	250 m³/h
Sound power level	31 – 46 dB(A)
Heat recovery efficiency	52 %
Maximum operating pressure, water side	6 bar
Maximum operating temperature	75 °C
Supply voltage	1~ 230 V AC, ±10 %, 50/60 Hz
Power rating	226 VA
Weight	70 kg

This specification text describes the general characteristics of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Specification text
SA-V
Under sill ventilation units for vertical installation on the façade
TROX SCHOOLAIR-V under sill ventilation unit with supply and extract air function, heat recovery and switchover option to secondary air mode (depending on air quality) as well as heating and/or cooling function, for vertical installation on the façade:

Device casing made of galvanised sheet steel

Cover and sheet metal connections: Connection via deep-drawn threads and stainless steel cross-head screws
All necessary internal air ducts sealed and insulated by lining
Internal electrical cable glands sealed
Visible surfaces powder-coated (RAL 9005, jet black)

Sound and heat-insulating lining on the suction and discharge side:

Glass fibre-laminated mineral wool (building material class A, non-combustible according to DIN 4102, T1), abrasion-resistant up to air velocities of 20 m/s, or closed-cell insulation material

The device meets the hygiene requirements of VDI 6022
Height-adjustable levelling feet, +40 mm, to compensate for structural tolerances
Connection to the on-site outdoor air and exhaust air openings in the façade:

With circumferential closed-cell sealing tape on the back of the device, 10 mm thick
The intake and discharge resistance of the on-site construction should not exceed 20 Pa at nominal volume flow

Room-side extract air intake at the top of the unit front
Use of 2 energy-saving EC centrifugal fans:

Supply and extract air fan classified in category SFP 0 (< 300 W/(m³/s)) in accordance with DIN EN 16798-3:2017-11

Suitable for 4 speed levels:

Control via the unit-integrated single-room control
Volume flow rate correction possible after installation by adjusting the control voltage

Technical requirements of EU Regulation 1253/2014 for non-residential ventilation systems:

Compliant and documented in accordance with the regulation

Motorised shut-off dampers in outdoor and exhaust air areas:

Normally closed in inactive state due to capacitor
Open-close actuator 230 V AC
Control via the unit-integrated single-room control

Automatic switchover to energy-efficient secondary air operation:

Only in conjunction with air quality sensor
Comparison of setpoints with the internal CO2 sensor readings
If the indoor air quality is adequate: Automatic changeover from outdoor air mode to secondary air mode

Connection point to the on-site electrical system:

Cable for on-site connection (not included in TROX scope of supply)
Cable (L, N, PE) with wire end ferrules, approx. 1 m exiting the device
On-site electrical system: 1~ 230 V AC, 50 Hz, 3 x 1.5 mm2 (3-core)

Electrical components in the device:

Completely wired with FSL-CONTROL III control system
Control components integrated in the device
Connection option for bus communication (optional)
Connection of room control panel etc. after opening the customer area of the control system

Connection point to the on-site Measurement/Control/ Regulation technology: Rail-mounted terminals type Wago 260

Master unit:

Optional integration into MCE/BACS via RS485 (Modbus/BACnet)
Master-slave connection RS485
Digital outputs DO
Digital inputs DI
Room control panel for measuring room temperature

Slave unit:

Master-slave connection RS485

Connection point to the on-site Measurement/Control/ Regulation technology: Network connection RJ45

Optional integration into an on-site MCE/BACS via Ethernet (Modbus/BACnet)
RJ45 connection socket as service access to the user interface

Under-sill cladding, to be provided by the client:

Must have perforations: for supply air intake, for extract air and secondary air intake
Must not restrict maintenance work or installation and removal of the unit from the front
Clear distance between the front edge of the unit to the inner edge of the under-sill cladding: approx. 30 mm
Closed-cell sealing tapes for sealing and adapting to the on-site cladding: not included in the TROX supply package

Filter change:

Quick filter change
Tool-free opening of the filter cover thanks to userfriendly quarter-turn fasteners (after opening the onsite cladding)
Accessibility must not be restricted by the on-site sill cladding

Materials and surfaces
0
Standard variant

Fixing points for installation:

Adjustable mounting bracket on top of the unit with 2 slotted holes
2 slotted holes in the rear wall of the casing, below the heat exchanger

Power consumption and connection dimensioning

Electrical power consumption of the entire unit at nominal volume flow 250 m³/h < 44 W
For dimensioning the connecting cable: Take into account a connected load of 226 VA

Integrated cross-flow heat recovery unit:

Seawater-resistant aluminium design
High efficiency: Heat recovery efficiency > 52 %
Including condensate collection and drainage

With electromotive bypass:

Allows a partial airflow to bypass the heat recovery unit
Actuator 24 V (modulating) 0 – 100 %
Control via the unit-integrated single-room control

Outdoor air filter as Mini Pleat filter class ePM1 (fine dust filter):

Filter class according to ISO16890: ISO ePM1 65%
Eurovent-certified
Made from high-quality, wet-strength glass fibre paper
In tight pleats
Spacer:

Made from thermoplastic hot-melt adhesive
Even distance between the pleats (4 mm)

Frame made of moisture-resistant nonwoven fabric with pull-out tabs
The frame must not reduce the airflow cross-section (filter size = airflow cross-section)
Filter area ≥ 2.96 m²

Extract air filter (coarse dust filter) as flat filter medium, filter class according to ISO 16890: ISO Coarse 75 %

Sizing data
2

2-pipe aluminium copper tube heat exchanger for air heating:

Adapted to the project-specific data
Easily removable for cleaning (the on-site connection to the main pipework is crucial, not included in the TROX scope of delivery)
Drain and vent option for each heating/cooling circuit

Cleaning the heat exchanger:

For easy removal: We recommend a connection to the on-site pipe network with flexible hoses (not included in the TROX scope of supply)
Connection points are the heat exchanger connections, ½" flat-sealing with union nut

Connection point to the on-site heating/plumbing system:

Pre-assembled hand-tight control components
Connection with external thread ½" flat-sealing

In the return flow: Valve including actuator
In the supply flow: Lockshield

Easy-to-clean condensate drip tray without condensate drain: made of galvanised sheet steel, powder-coated (RAL 9005)

Easy-to-clean condensate drip tray with condensate drain: Ø 12 x 1 mm made of galvanised sheet steel, powdercoated (RAL 9005)

Nominal size

Width: approx. 397 mm
Height: approx. 2160 mm (without levelling feet, without fixing bracket)
Depth: approx. 359 mm (without façade seal)

C3
With FSL-CONTROL III:

Single room controller for DIN rail mounting in the unit or in a separate control casing
Integrated microSD card as flash memory medium

At least 2 GB storage space
Saves the trend data
Accessible via RJ45 connection socket

For simple master-slave communication via Modbus RTU
Connection of up to 10 slave units to one master unit
Software:

3 operating modes: Off, Automatic, Manual mode
3 operating states: Occupied, Unoccupied, Standby
4 operating state overrides: Boost, Class, night purge, 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 operation
Year-round heat recovery use

MA
Control function Master

Software package specially developed for decentralised ventilation units
Factory-equipped
Configured for master units
42 digital or analogue inputs and outputs
CO2-guided air quality control
Alarm messages: Type A (shutdowns) and Type B (notifications)

SL
Control function Slave

Software package specially developed for decentralised ventilation units
Factory-equipped
28 digital or analogue inputs and outputs

T
Only with control function MA
Real-Time-Clock (RTC):

Part of the master software package
Includes a simple time programme

7 days with 10 switching points each
Automatic switching between summer and winter time
Night purge schedules

With Modbus TCP

Modbus TCP interface (Ethernet):

FSL-CONTROL III can be integrated into an on-site MCE/BACS via the Modbus TCP protocol.
Required for visualisation via the X-TAIRMINAL
Additionally including web server for simplified configuration, commissioning and remote monitoring of the device.

With BACnet IP

BACnet IP interface (Ethernet):

FSL-CONTROL III can be integrated into an on-site MCE/BACS via BACnet IP protocol.
Additionally including web server for simplified configuration, commissioning and remote monitoring of the device.

Only with control function MA

With Modbus RTU

Modbus RTU interface (RS 485):

FSL-CONTROL III can be integrated into an on-site MCE/BACS via Modbus RTU

Only with control function MA

With BACnet MS/TP

BACnet MS/TP interface (RS485):

FSL-CONTROL III can be integrated into an on-site MCE/BACS via BACnet MS/TP

Only with control function MA
Air quality sensor
With CO2sensor:

Component of the master unit
Sensor located in the extract air intake to monitor indoor air quality and control the outdoor air volume flow accordingly.
Measurement via an NDIR sensor that works on an infrared basis and compensates for any contamination through its 2-beam measuring principle
Measuring range 0 – 2000 ppm

V
Only with control function MA
Air quality sensor
With VOC sensor

Detection of a wide range of VOC emissions correlating with the CO2concentration in indoor air
TVOC mit auto-calibration
Detected indoor air substances include alcohols, aldehydes, aliphatic hydrocarbons, amines, aromatic hydrocarbons, CO, CH4, liquid gas, ketones, organic acids
Detection range: 0 – 2000 ppm, VOC and CO2equivalent
Self-test and automatic zero-point adjustment

Z
With supply air temperature sensor

Supply air temperature sensor with NTC thermistor sensing element

Resistance 10 kΩ at 25 °C
Measuring range -35 – 105 °C
Very short response time due to perforated measuring tip

A
With outside air temperature sensor (only with MA control function)

Outdoor air temperature sensor with NTC thermistor sensing element

Resistance 10 kΩ at 25 °C
Measuring range -35 – 105 °C

HV
Thermoelectric valve actuator:

For opening and closing valves

With position indicator
Including plug-in connecting cable
Supply voltage: 24 V DC
Control voltage 0 – 10 V DC
Power consumption 1 W
Protection rating: IP 54

HVE

Electromotive valve actuator

For opening and closing valves

Supply voltage 24 V AC/DC
Power consumption max. 2.5 VA
Control signal 3-point DC 0 – 10 V
Permissible media temperature 1 – 110 °C

R
Lockshield

For regulation and shut-off

Valve casing: straight way
External thread on both sides ½" flat sealing
Hand-tightened pre-assembled
Nominal width DN 15
Maximum media temperature 120 °C

0.25

Straight-through small valve:

Straight-through valve body

Male thread on both sides ½" flat sealing
Pre-assembled hand-tight
PN 16
DN 10
Kvs value 0.25
Media temperature 1 – 110 °C

0.40
Straight-through small valve:

Straight-through valve body

Male thread on both sides ½" flat sealing
Pre-assembled hand-tight
PN 16
DN 10
Kvs value 0.40
Media temperature 1 – 110 °C

0.63

Straight-through small valve:

Straight-through valve body

Male thread on both sides ½" flat sealing
Pre-assembled hand-tight
PN 16
DN 10
Kvs value 0.63
Media temperature 1 – 110 °C

1.00
Straight-through small valve:

Straight-through valve body

Male thread on both sides ½" flat sealing
Pre-assembled hand-tight
PN 16
DN 10
Kvs value 1.00
Media temperature 1 – 110 °C

F0.50

Pressure-independent control valve

Straight-through valve body

Male thread on both sides ½" flat sealing
Pre-assembled hand-tight
With modulating Open-Close control in combination with an externally adjustable, dynamic volume flow controller
With full valve authority
Nominal width DN 10
Media temperature 0 – 120 °C

Replacement filter set

Extract air filter: Filter pad
Outdoor air filter: Mini-Pleat-Filter

SA-V

–

397 × 2160 × 359

–

0,40

1 Type
SA-V vertical decentralised ventilation unit X-CUBE/SCHOOLAIR-V

2 Variant
No entry: Standard

3 Heat exchanger
2 2-pipe

4 Heat exchanger construction
Specify construction (technical design with TROX EPF or TROX CONFIGURATOR)

5 Construction
KO without condensate drain
KM with condensate drain

6 Nominal size [mm]
Width x height x depth
397 x 2160 x 359

7 Control system
OR without control system
C3 with FSL-CONTROL III

8 Control function
MA Master
SL Slave

9 Real-time clock
Only with control function MA
No entry: without real time clock
T with real time clock

10 Interface
No entry: without interface
MT with Modbus TCP
MR with Modbus RTU (only with control function MA)
BI with BACnet IP
BM with BACnet MS/TP (only with control function MA)

11 Air quality sensor
Only with control function MA
No entry: without air quality sensor
C with CO2 sensor
V with VOC sensor

12 Supply air temperature sensor
Z with supply air temperature sensor

13 Outdoor air temperature sensor
Only with control function MA
No entry: without outdoor air temperature sensor
A with outdoor air temperature sensor

14 Heating valve
HV with thermoelectric actuator
HVE with electromotive actuator

15 Lockshield – heating circuit
R with lockshield

16 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)

Order example: SA-V-2-1-KO/397x2160x359/C3-MA-T/MR/C/Z/A/HV-R-0.40

Type	SA-V	Ventilation unit for ceiling installation X-CUBE/SCHOOLAIR-V
Variant	-	Standard
Heat exchanger	2	2-pipe
Heat exchanger construction	1	Heat exchanger type 1
Construction	KO	without condensate drain
Nominal size [mm]	397×2160×359	Width 397, height 2160, depth 359
Control system	C3	with FSL-CONTROL III
Control function	MA	Master
Real time clock	T	with real time clock
Interface	MR	with Modbus RTU
Air quality sensor	C	with CO₂sensor
Supply air temperature sensor	Z	with supply air temperature sensor
Outdoor air temperature sensor	A	with outdoor air temperature sensor
Heating valve	HV	with thermoelectric actuator
Lockshield heating circuit	R	with lockshield
Kvs value heating valve	0.40	0.40 (straight-way valve)

Downloads

product information

Product data sheet SA-V-2L

SA-V-2_PD_2026_03_19_DE_en Product data sheet 350 KB pdf
SCHOOLAIR-V-2L_BIM 3D

280 KB zip

brochures

Brochure SCHOOLAIR TROX

AL_2022_05_School_Ventilation_DE_en_web Brochure 3,6 MB pdf

certificates

Conformity declaration Type SCHOOLAIR-V

Conformity declaration 54 KB pdf
Conformity declaration Decentralised ventilation units

Conformity declaration 120 KB pdf
Declaration of hygiene conformity Type SCHOOLAIR-V-HE

SA-V-HE_HC_2025_11_en Declaration of hygiene conformity 650 KB pdf
ErP-product information Type SCHOOLAIR-V

X-CUBE-SCHOOLAIR-V-2L_ErP_2025_03_DE_en Certificat 380 KB pdf

operation manuals

Installation and configuration manual Type FSL-CONTROL III

FSL-C_III_SM_A00000080125_V1_2020_04_GB_en 4,9 MB pdf
Installation and configuration manual Type FSL‑CONTROL II

SM_2018_04_A00000046303_FSL-CONTROL_II_V6 1,5 MB pdf
Installation and operating manual SCHOOLAIR-V-2L

SA-V-2L_IOM_CD10049_V1_2025_07_GB_en Installation and operating manual 5,6 MB pdf
Quick guide X-CUBE ROOMAIR/SCHOOLAIR

ROOMAIR_SCHOOLAIR_SV_IM_CD10133_V2_2026_02_11_GB_en Quick guide 240 KB pdf

By clicking the button, you allow us to provide you with an excellent website experience and easy shopping processes. These cookies include ones that are necessary for the operation of the site and for the control of our services and applications, as well as ones that are used solely for statistical purposes, for convenience settings or to display personalized content. You can decide which categories you want to allow and you can adjust the data utilisation settings based on your individual requirements. Please note that, depending on the settings that you have selected, all functionalities of the page might not be available. You can change your selection at any time.

TECHNICALLY NECESSARY

These cookies are necessary for the proper functioning of our website and cannot be disabled. As a rule, these cookies are set only in response to actions taken by you, such as setting your privacy preferences or filling the shopping cart. In addition, security-relevant functionalities or support via a dedicated webchat are integrated, including all session cookies from TROX set after you log in as a customer. You can set your browser to block these cookies or notify you about them. As a result, however, some areas of the website might not function as intended.

STATISTICS AND WEBSITE ANALYSIS

These cookies make it possible to collect data for statistics and analysis so that TROX can measure the performance of the websites visited, identify technical problems and find starting points for optimisation. They may be set by us or by third parties whose services we use on our sites. Users also help to identify, for example, which pages are used most frequently or only rarely or how people navigate between web pages. All information used by third parties is aggregated and anonymised.

X-CUBE SCHOOLAIR-V-2L

Supply and extract air unit for vertical installation on the façade

Technical information

Downloads

product information

Product data sheet SA-V-2L

SCHOOLAIR-V-2L_BIM 3D

brochures

Brochure SCHOOLAIR TROX

certificates

Conformity declaration Type SCHOOLAIR-V

Conformity declaration Decentralised ventilation units

Declaration of hygiene conformity Type SCHOOLAIR-V-HE

ErP-product information Type SCHOOLAIR-V

operation manuals

Installation and configuration manual Type FSL-CONTROL III

Installation and configuration manual Type FSL‑CONTROL II

Installation and operating manual SCHOOLAIR-V-2L

Quick guide X-CUBE ROOMAIR/SCHOOLAIR

TECHNICALLY NECESSARY

STATISTICS AND WEBSITE ANALYSIS

CONVENIENCE AND PERSONALISATION

FOR THE BEST TROX EXPERIENCE