X-CUBE SCHOOLAIR-D-HV-2220

SUPPLY AND EXTRACT AIR UNIT FOR INSTALLATION UNDER THE CEILING

Ready-to-operate decentralised ventilation unit for convenient room temperature control and 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
Highly efficient heat exchanger for heating and cooling as 2-pipe or 4-pipe system
Heat exchanger connection on the right-hand side, when viewed from the room
Motorised shut-off dampers, normally closed

Optional equipment and accessories

Control system FSL-CONTROL III, specially designed and modularly constructed for decentralised ventilation systems
Equipped with electric heater

Technical information

1 Outdoor air temperature sensor (optional)

2 Shut-off damper with actuator (outdoor air and exhaust air)

3 Outdoor air filter ISO ePM1 with differential pressure monitoring

4 Sound attenuators

5 Fans (supply air and extract air)

6 Rotary heat exchanger for heat recovery

7 Heating coil

8 Cooling coil (only change-over system)

9 Supply air temperature sensor

10 CO2 sensor (optional)

11 Extract air filter ISO coarse

Functional description

Decentralised supply and extract air units ventilate the room and cover the heating load according to 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 in energy-efficient operating situations. Before the supply air, with momentum, flows into the room without drafts from the supply air grille near the ceiling (Coanda effect), it is heated (or optionally cooled) in the heat exchanger if necessary. 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 shut-off damper. If the room air quality is sufficient, FSL-CONTROL III closes the outdoor air dampers and changes 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. The Coanda effect deflects the airflow upwards and causes it to stick 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 air outlet, a room air vortex is created. The supply air arriving in the occupied zone has a very low air velocity and flows upwards at heat sources - e.g. people and appliances. It forms a buoyant airflow through natural convection. As a result, the air is exchanged primarily in these areas. Directly under the ceiling, the rising stale air is drawn into the device and discharged to the 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 600 m³/h)
Nominal volume flow	400 m³/h
Sound pressure level at nominal volume flow and 8 dB	35 dB(A)
Sound power level	33 – 51 dB(A)
Heat recovery efficiency	75%
maximum operating pressure, water side	6 bar
maximum operating temperature	75 °C
Supply voltage	230 V AC ±10 %, 50/60 Hz
Power rating	640 VA
Weight	225 kg

SA-D

–

2770 × 401 × 854

–

0.4

–

0.63

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

2 2-pipe

4 4-pipe

5 Heat exchanger construction

Specify construction (technical design with TROX EPF or TROX CONFIGURATOR)

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 × height × depth

2228 × 401 × 854 (only with installation situation 0)

2420 × 401 × 854 (only with installation situation F)

2770 × 401 × 854 (only with installation situation T)

2765 × 433 × 923 (only with installation situation Z)

2220 × 401 × 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 CO2sensor

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

17 Heating valve

HV with thermoelectric actuator

HVE with electromotive actuator

18 Lockshield – heating circuit

R with lockshield

19 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)

20 Cooling valve

Only with heat exchanger 4

KV with thermoelectric actuator

KVE with electromotive actuator

21 Lockshield cooling circuit

Only with heat exchanger 4

R with lockshield

22 Kvs value cooling valve

Only with heat exchanger 4

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)

1 Accessory frame to be ordered separately

2 Basic unit is supplied without accessories. Required accessories to be ordered separately.

Order example: SA-D-HV-T-4-1-LB-B/2770×401×854/0/C3-MA-T/MR/C/Z/A/HV-R-0.40/KV-R-0.40

Type	SA-D	Ventilation unit for ceiling installation X-CUBE/SCHOOLAIR-D
Variant	HV	high volume flow and rotary heat recovery unit
Installation situation	T	partially integrated in suspended ceiling
Heat exchanger	4	4-pipe
Heat exchanger construction	1	Heat exchanger type 1
Construction	LB	(Outdoor air) connection to the left, (exhaust air) connection to the rear
Connection	B	Flanged collar for outdoor air and exhaust air
Nominal size [mm]	2770×401×854	Width 2770, height 401, depth 854
Exposed surface	0	Powder-coated, RAL 9010 (pure white)
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)
Cooling valve	KV	with thermoelectric actuator
Lockshield – cooling circuit	R	with lockshield
Kvs value cooling valve	0.40	0.40 (straight-way valve)

Downloads

product information

Product data sheet X-CUBE SCHOOLAIR-D-HV-2220

SA-D-HV-2220_PD_2026_03_31_DE_en Product data sheet 1,2 MB pdf

operation manuals

Installation and operating manual SA-D-HV-2220

SA-D-HV-2220_IOM_CD10102_V1_2026_02_16_GB_en Installation and operating manual 6,7 MB pdf
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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