SCHOOLAIR-D-HV-EH-2220
SA-D-HV-EH-2220-highlight-1

Rotary heat recovery unit

Tested to VDI 6022

SA-D-HV-EH-2220-highlight-2
Revision filter Customer
SA-D-HV-EH-2220-highlight-3
Customer connection control
SA-D-HV-EH-2220-highlight-4

Electric heating coil

SCHOOLAIR-D-HV-EH-2220
SA-D-HV-EH-2220-highlight-1
SA-D-HV-EH-2220-highlight-2
SA-D-HV-EH-2220-highlight-3
SA-D-HV-EH-2220-highlight-4

X-CUBE SCHOOLAIR-D-HV-EH-2220    

Supply and extract air unit for installation under the ceiling

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
■ Freely suspended installation, partially or fully integrated in a suspended ceiling
■ Acoustically optimised EC fans with low specific fan power, according to DIN EN 16798-3 SFP = 0
■ Reduced fine dust and pollen contamination due to integral filters that conform to VDI 6022 – filter class ISO ePM1 65% and extract air ISO coarse 90%
■ Tool-free filter replacement
■ Rotary heat recovery unit (heat recovery coefficient 75 %) with humidity recovery in winter
■ Year-round use of the heat recovery system
■ Switch-over option to secondary air mode
■ Electric heating coil with 1500 W max. heating capacity
■ Motorised shut-off dampers, normally closed

Optional equipment and accessories
■ Modular control system FSL-CONTROL III, specially designed for decentralised ventilation units
■ Equipped with a heat exchanger for heating and/or cooling, available as a 2- or 4-pipe system

Technical information

  • FUNCTION
  • TECHNICAL DATA
  • SPECIFICATION TEXT
  • ORDER CODE
SA-D-HV-EH-2220-Funktion-1

SEH Single room exhaust air
SET Single room extract air
SRO Single room outdoor air
SRS Single room supply air
SEC Secondary air (optional)

1 Outdoor air temperature sensor (optional)
2 Shut-off damper with actuator (exhaust air and outdoor air)
3 Outdoor air filter ISO ePM1, with differential pressure monitoring
4 Sound attenuator
5 Fan (supply air and extract air)
6 Rotary heat recovery unit
7 Electric heating coil
8 Supply air temperature sensor
9 CO2 sensor (optional)
10 Extract air filter ISO coarse

SA-D-HV-EH-2220-Funktion-1
SA-D-HV-EH-2220-Funktion-2

Functional description
Decentralised supply and extract air units ventilate the room and cover the heating load 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 flows through the rotary heat recovery unit, which can be switched off under energy‑efficient operating conditions. Before the supply air flows draught-free along the ceiling via the supply air grille (Coanda effect), it can be heated in the electric heating coil if required.
The extract air first flows through the extract air filter, before it is discharged to the outside as exhaust air, by passing the heat recovery unit, the extract air fan and the motorised shutoff damper. If the indoor air quality is adequate, the FSL-CONTROL III control system closes the outdoor air dampers and switches to secondary air operation, which is more energy efficient. The control system compares the room air quality setpoints to the actual values measured by the CO2sensor 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 at medium speed just below the ceiling. Due to the Coanda effect, the airflow is deflected upwards and remains attached to the underside of the ceiling.
This enables very large throw distances, which means that even large rooms can be ventilated effectively. When the supply air reaches the wall opposite the outlet, a room air vortex is formed.
The airflow reaching the occupied zone has a very low velocity and rises on heat sources, for example on people and devices. A buoyant airflow is formed as a result of natural convection. As a result, the air is exchanged primarily in these areas. Directly below the ceiling, the rising stale air is drawn into the device and discharged outside.

Width

2228 mm, 2420 mm, 2770 mm, 2765 mm

Height

401 mm, 433 mm

Depth

854 mm, 923 mm

Volume flow

200, 300, 400 m³/h (Boost 800 m³/h)

Nominal volume flow

400 m³/h

Sound pressure level at nominal volume flow and 8 dB

35 dB(A)

Room attenuation


Sound power level

33 – 51 dB(A)

Heat recovery efficiency

75%

Supply voltage

230 V AC ±10 %, 50/60 Hz

Connected load (depending on the electric heating coil

600/900/1200/1500 W)

1240/1540/1840/2140 VA

Weight unit/frame

225 kg/65 kg

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

Specification text

SA-D
Decentralised ventilation units for installation in the ceiling area
TROX SCHOOLAIR-D 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 installation in the ceiling area:
  • 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 lined
    • Internal electrical cable glands sealed
    • Visible surfaces powder-coated
  • 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
  • Meets the hygiene requirements of VDI 6022
  • Extract air intake and supply air outlet on the underside of the unit
  • 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
    • Subsequent correction of volume flow rate steps possible by adjustment of 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 actual values measured, for example, by the internal CO2sensor
    • 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 unit
    • On-site electrical system: 1~ 230 V AC, 50 Hz, 3 x 1.5 mm2 (3-core)
  • Connection point to the on-site Measurement/Control/ Regulation works: Rail-mounted terminal blocks, 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 works: 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

HV

high volume flow and rotary heat recovery unit
  • One-piece device casing made of galvanised sheet steel
  • Fixing points for installation:
    • Slotted hole brackets on both sides for fixing to the ceiling
    • Connection to the on-site outdoor air and exhaust air openings in the façade, as per order code:
      • Wall connection sealing kit made of closed-cell sealing tape on the back of the device, 10 mm thick
      • Flanged collar for outdoor air and exhaust air
        • Ø 250 mm
      • Duct connection for outdoor air or exhaust air
        • 200 x 200 mm
    • The intake and discharge resistance of the on-site construction should not exceed 20 Pa at nominal volume flow
  • The low-pulse extract air intake flows in the opposite direction to the outflow via the innovative and integrated supply air diffuser
    • Guaranteed room ventilation
    • Regardless of whether mounted above the front side panel or on the façade side
  • Upstream and downstream sound attenuators minimise the sound power levels and increase the fan efficiency at the same time
  • Power consumption and connection dimensioning
    • Electrical power consumption of the entire device at nominal volume flow 400 m³/h < 88 W
    • For dimensioning the connecting cable:
      • Take into account a connected load of 640 VA
      • Also consider the output of the selected electric heating coil
  • Integrated rotary heat exchanger for heat recovery and condensation
    • Modulating control
    • Control via the unit-integrated single-room control
    • High efficiency: Heat recovery efficiency > 75 %
    • Humidity recovery in winter up to 50 %
  • Electrical components:
    • 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
  • Outdoor air filter as Mini Pleat filter, 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)
  • Extract air filter with large filter surface due to pleated filter media
    • Filter class according to ISO 16890: ISO Coarse 90%
    • Low differential pressures at high volume flows
    • Filter media made of synthetic fibres
    • Moisture-resistant frame made of non-woven fabric
    • Tested as per ISO 16890
  • Monitoring of the filter life by integrated differential pressure monitoring
  • Inspection via 2 covers from below:
    • The device covers are held on the façade side by hinges
    • Secured on the room side by maintenance fasteners with special locks
    • Note: The underside of the device must be completely accessible for maintenance work and possible disassembly
    • Quick filter change possible as filter insert is accessible after opening a cover section

0

Installation situation
  • Equipped for installation in a suspended ceiling in one level, flush with the bottom edge of the unit

F

Installation situation
  • Equipped for freely suspended installation on the ceiling

T

Installation situation
  • Equipped for partial integration into a suspended ceiling

Z

Installation situation
  • Prepared for installation in a frame that has already been integrated into the suspended ceiling

I

Installation situation
  • Device for an installation situation that has not yet been determined. Version without attachments such as wall connection or equipment customised to the installation situation

EH with electric heating coil

  • Electric heating coil for air heating:
    • Maximum surface temperature 60 °C: Dust smouldering is reliably prevented
    • Including control loop consisting of: Temperature sensor NTC 10 kΩ and power controller
    • Supply air temperature: max. 25 °C
    • Including safeguards:
      • Mechanical safety temperature limiter: selfresetting
      • Mechanical safety temperature monitor: manual-reset

6

Variant: Electric heating coil
  • EH-6:
    • Maximum heating capacity 600 W, modulating control
    • For dimensioning the connecting cable: Take into account a connected load of 1240 VA
    • Electrical power consumption of the entire unit at nominal volume flow 400 m³/h < 688 W

9

Variant: Electric heating coil
  • EH-9:
    • Maximum heating capacity 900 W, modulating control
    • For dimensioning the connecting cable: Take into account a connected load of 1540 VA
    • Electrical power consumption of the entire unit at nominal volume flow 400 m³/h < 988 W

12

Variant: Electric heating coil
  • EH-12:
    • Maximum heating capacity 1200 W, modulating control
    • For dimensioning the connecting cable: Take into account a connected load of 1840 VA
    • Electrical power consumption of the entire unit at nominal volume flow 400 m³/h < 1288 W

15

Variant: Electric heating coil
  • EH-15:
    • Maximum heating capacity 1500 W, modulating control
    • For dimensioning the connecting cable: Take into account a connected load of 2140 VA
    • Electrical power consumption of the entire unit at nominal volume flow 400 m³/h < 1588 W

BB

Construction
  • Outdoor air connection to the rear, exhaust air connection to the rear

LB
Construction
  • Outdoor air connection to the left, exhaust air connection to the rear

BR

Construction
  • Outdoor air connection to the rear, exhaust air connection to the right

LR

Construction
  • Outdoor air connection to the left, exhaust air connection to the right

W

Connection
  • Wall connection sealing kit for outdoor air and exhaust air

B

Connection
  • Flanged collar for outdoor air and exhaust air

Q

Connection
  • Duct connection for outdoor air or exhaust air
Nominal size Installation situation 0
  • Width: approx. 2228 mm (without fixing brackets)
  • Height: approx. 401 mm
  • Depth: approx. 854 mm (without façade connection)
Nominal size Installation situation F
  • Width: approx. 2420 mm (without fixing brackets)
  • Height: approx. 401 mm
  • Depth: approx. 854 mm (without façade connection)
Nominal size Installation situation T
  • Width: approx. 2770 mm (without fixing brackets)
  • Height: approx. 401 mm
  • Depth: approx. 854 mm (without façade connection)
Nominal size Installation situation Z
  • Width: approx. 2765 mm (without fixing brackets)
  • Height: approx. 423 mm
  • Depth: approx. 923 mm (without façade connection)
Nominal size Installation situation I
  • Width: approx. 2220 mm (without fixing brackets)
  • Height: approx. 401 mm
  • Depth: approx. 854 mm (without façade connection)

0

Exposed surface
  • RAL 9010 (pure white), GU 30
P1
Exposed surface
  • RAL 7010 (basalt grey), GU 30
  • Alternatively RAL CLASSIC of your choice, GU 30

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

MT

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.

BI

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.

MR

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

BM

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

C

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

Replacement filter set

  • Extract air filter as Z-Line filter
  • Outdoor air filter: Mini-Pleat-Filter
SA-D–HV–T–EH–15–LB–B/2770 x 401 x 854/0/C3–MA–T/MR/C/Z/A
||||||||||||||||
12345678910111213141516

1 Type
SA-D Ventilation unit for ceiling installation X-CUBE/ SCHOOLAIR-D

2 Variant
HV high volume flow and rotary heat recovery unit

3 Installation situation
0 Installation integrated in suspended ceiling
F freely suspended installation
T partially integrated in suspended ceiling
Z Installation in a pre-installed frame1
I Installation situation to be decided2

4 Heat exchanger
EH with electric heating coil

5 Heat exchanger construction
6 600 W
9 900 W
12 1200 W
15 1500 W

6 Construction
BB Outdoor air connection to the rear, exhaust air connection to the rear
LB Outdoor air connection to the left, exhaust air connection to the rear (not with installation situation F or connection W)
BR Outdoor air connection to the rear, exhaust air connection to the right (not with installation situation F or connection W)
LR Outdoor air connection to the left, exhaust air connection to the right (not with installation situation F or connection W)

7 Connection
0 without connection (only with installation situation I)
W Wall connection sealing kit for outdoor air and exhaust air (not with installation situation I)
B Flanged collar for outdoor air and exhaust air (not with installation situation I)
Q Duct connection for outdoor air and exhaust air (not with installation situation I)

8 Nominal size [mm]
Width x height x depth
2228 x 401 x 854 (only with installation situation 0)
2420 x 401 x 854 (only with installation situation F)
2770 x 401 x 854 (only with installation situation T)
2765 x 433 x 923 (only with installation situation Z)
2220 x 401 x 854 (only with installation situation I)

9 Exposed surface
0 powder-coated, RAL 9010 (pure white), GU 30
P1 powder-coated, RAL 7012 (basalt grey), GU 30, or specify alternative RAL CLASSIC colour, GU 30

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

11 Control function
MA Master
SL Slave

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

13 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)

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

15 Supply air temperature sensor
Z with supply air temperature sensor

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

¹ Accessory frame to be ordered separately
² Basic unit is supplied without accessories. Required accessories must be ordered separately.

Order example: SA-D-HV-T-EH-15-LB-B/2770x401x854/0/C3-MA-T/MR/C/Z/A

TypeSA-DVentilation unit for ceiling installation X-CUBE/SCHOOLAIR-D
VariantHVhigh volume flow and rotary heat recovery unit
Installation situationTpartially integrated in suspended ceiling
Heat exchangerEHwith electric heating coil
Heat exchanger construction151500 W
ConstructionLBOutdoor air connection to the left, exhaust air connection to the rear
ConnectionBFlanged collar for outdoor air and exhaust air
Nominal size [mm]2770x401x854Width 2770, height 401, depth 854
Exposed surface0powder-coated, RAL 9010 (pure white)
Control systemC3with FSL-CONTROL III
Control functionMAMaster
Real time clockTwith real time clock
InterfaceMRwith Modbus RTU
Air quality sensorCwith CO2 sensor
Supply air temperature sensorZwith supply air temperature sensor
Outdoor air temperature sensorAwith outdoor air temperature sensor

Downloads

product information

  • Product data sheet SA-D-HV-EH-2220

    SA-D-HV-EH-2220_PD_2026_04_01_DE_en Product data sheet 1 MB pdf

operation manuals

  • Installation and operating manual SA-D-HV-EH-2220

    SA-D-HV-EH-2220_IOM_CD10137_V1_2026_02_16_GB_en Installation and operating manual 6,5 MB pdf

  • Quick guide X-CUBE ROOMAIR/SCHOOLAIR

    ROOMAIR_SCHOOLAIR_SV_IM_CD10133_V2_2026_02_11_GB_en Quick guide 240 KB pdf
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