Type SCHOOLAIR-V

Supply and extract air unit with heat exchanger and heat recovery, secondary air option, for vertical installation on an external wall, e.g. adjacent to a window

Ready-to-operate decentralised ventilation unit that provides good comfort levels, used for the ventilation and extract ventilation of rooms such as classrooms in schools

  • Acoustically optimised EC fans with low specific fan powers, SFP-1 according to EN 13779
  • Plate heat exchanger for heat recovery (air/air), including bypass damper with electric actuator (open-close)
  • Alternatively: Rotary heat exchanger for heat recovery (air/air), including bypass with electric actuator (modulating or open-close)
  • Heat exchanger for heating and cooling as 2-pipe or 4-pipe system
  • Unit base of approx. 0.24 m²
  • Easy filter change, no tools required
  • Condensate drip tray with or without condensate drain
  • Motorised shut-off dampers, normally closed (NC)
  • Automatic switching to secondary air mode (based on air quality)


Optional equipment and accessories

  • Modular control system FSL-CONTROL II, specially for decentralised ventilation systems
  • Demand-based fresh air volume, free cooling and night purge, depending on control strategy
  • Variable heat recovery
  • Powder-coated RAL 9005 (black)

SCHOOLAIR-V 4L 00259971_0


  • Application
  • Description

Application

  • Ventilation and extract ventilation of rooms with a depth up to approx. 6 m
  • 2-pipe or 4-pipe heat exchangers enable good comfort levels
  • Inducing displacement flow
  • Energy-efficient solution since water is used for heating and cooling
  • For new buildings, refurbishment projects and revitalisation projects
  • Vertical installation on the façade system or an external wall
  • Typical applications include classrooms in schools, playrooms in daycare facilities, meeting rooms and offices with a high air change rate

Special characteristics

  • Decentralised ventilation unit for high volume flow rates
  • Motorised shut-off dampers for fresh air and exhaust air, normally closed (NC) in order to prevent uncontrolled airflows
  • Demand-based ventilation and extract ventilation is possible by means of monitoring the room air quality and with dedicated control equipment
  • The type of heat exchanger for heat recovery depends on the unit variant: cross flow plate heat exchanger, cross counter flow plate heat exchanger including bypass damper with electric actuator (open-close or modulating) or rotary heat exchanger
  • Heat exchanger as 2-pipe or 4-pipe system, with G½" union nuts and flat seals
  • Meets the hygiene requirements of VDI 6022
  • Filter class: F7 for fresh air, G3 for extract air
  • Easy filter change with quick release fasteners, no tools required
  • Condensate drip tray with or without condensate drain
  • Compact construction, hence particularly suitable for refurbishment projects
  • Automatic switching to secondary air mode (only with an air quality sensor) if the room air quality (measured with the integral VOC sensor, for example) is between the previously defined range. The unit always starts in secondary air mode, which is more energy efficient.
  • Depending on the unit, an enthalpy heat exchanger for heat recovery may be used

Nominal sizes

  • SCHOOLAIR-V 2-pipe system: 397 × 2160 × 359 mm (B × H × T)
  • SCHOOLAIR-V 4-pipe system: 397 × 2350 × 359 mm (B × H × T)
  • SCHOOLAIR-V-1800 2-pipe system, 4-pipe system: 600 × 1800 × 359 mm (B × H × T)
  • SCHOOLAIR-V-HE 2-pipe system, 4-pipe system: 600 × 2000 × 408 mm (B × H × T)
  • SCHOOLAIR-V-HV 2-pipe system, 4-pipe system: 600 × 2200 × 408 mm (B × H × T)

Variants

  • SCHOOLAIR-V-2L – volume flow rates: 150, 200, 250, 320 m³/h with cross flow plate heat exchanger for heat recovery
  • SCHOOLAIR-V-4L – volume flow rates: 150, 200, 250, 320 m³/h with cross flow plate heat exchanger for heat recovery
  • SCHOOLAIR-V-1800 – volume flow rates: 150, 230, 280 and 350 m³/h, with cross flow plate heat exchanger for heat recovery
  • SCHOOLAIR-V-HE – volume flow rates: 150, 200, 240, 360 m³/h with cross flow plate heat exchanger for heat recovery (or enthalpy as an alternative)
  • SCHOOLAIR-V-HV – volume flow rates: 200, 300, 400, 500 m³/h with rotary heat exchanger for heat recovery

Construction

  • Powder-coated RAL 9005, black

Accessories

  • Outer casing made of wood, with integral supply air and extract air grilles

Useful additions

  • Modular control system FSL-CONTROL II, specially for decentralised ventilation systems
  • Connecting hoses

Construction features

  • 2 energy-efficient EC fans with low specific fan powers, SFP = 1 according to EN 13779
  • The supply air is discharged to the room as an inducing displacement flow from the lower front part of the unit
  • Extract air is taken in to the upper part of the unit

Materials and surfaces

  • Casing, filter chamber cover, fans and levelling feet are made of galvanised sheet steel
  • Heat exchanger with copper tubes and aluminium fins
  • Heat exchanger for heat recovery made of aluminium or plastic (depending on variant)
  • Casing powder-coated, black (RAL 9005)
  • F7 filter medium made of moisture-resistant glass fibre paper (certified by Eurovent)
  • Mineral wool lining to DIN 4102, fire rating class A, faced with glass fibre fabric as a protection against erosion, effective with airflow velocities up to 20 m/s
  • Closed cell sealing strips

Standards and guidelines

  • Façade ventilation units of Type SCHOOLAIR-V conform to VDI 6035 and VDMA 24390
  • Hygiene certificate to VDI 6022
  • Heating/cooling fluid conforms to VDI 2035
  • Meets the requirements of EU directive 1253/2014 (ErP).

Maintenance

  • VDI 6022, Part 1, applies (Hygiene requirements for ventilation and air-conditioning systems and units)
  • The heat exchanger can be vacuumed with an industrial vacuum cleaner if necessary
  • It can also be cleaned with commercial, non-aggressive cleaning agents

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code

Functional description

Decentralised supply and extract air units for room ventilation and for dissipating cooling loads and heat loads.

An EC centrifugal fan takes in the fresh air which then flows through the motorised shut-off damper and the F7 filter.

Once the fresh air has passed the fan, it flows through the heat exchanger for heat recovery; it is possible to bypass the heat exchanger in order to protect it, or when it is sensible with regard to energy efficiency.

If necessary, the air is heated or cooled by the heat exchanger before it is discharged to the room as a displacement flow.

The extract air first passes a G3 filter, then flows through the heat exchanger, the extract air fan and the motorised shut-off damper before it is discharged to the outside as exhaust air.

If the room air quality is good, the unit can be operated in secondary mode only.

Width

397 mm (2-pipe or 4-pipe), 600 mm (2-pipe or 4-pipe, 1800, HE and HV)

Height

1800 mm (2-pipe or 4-pipe, 1800 version), 2000 mm (HE version), 2160 mm (2-pipe), 2200 mm (HV version), 2350 mm (4-pipe)

Depth

359 mm (2-pipe or 4-pipe, 1800 version) 408 mm (2-pipe or 4-pipe HE and HV versions)

Fresh air flow rate

Up to 500 m³/h

Supply air flow rate

Up to 500 m³/h

Cooling capacity

Up to 1685 W

Heating capacity

Up to 6020 W

Max. operating pressure, water side

6 bar

Max. operating temperature

75 °C

Sound power level

31 – 50 dB(A)

Supply voltage

230 V AC ±10 %, 50/60 Hz

Weight

From 80 kg


SCHOOLAIR-V-0 (sizing examples)

Supply air flow rate

m³/h

150

200

250

320

Fresh air flow rate

m³/h

150

200

250

320

Total cooling capacity

W

From 680

From 900

From 1130

From 1440

Room cooling capacity

W

From 401

From 534

From 668

From 844

Temperature of the air in the unit

°C

32

32

32

32

Rel. humidity

%

40

40

40

40

Water content of the dry air

g/kg

11.9

11.9

11.9

11.9

Supply air temperature

°C

18

18

18

18.1

Condensation

g/h

0

0

0

0

Chilled water flow rate

l/h

80

130

190

250

Water temperature, inlet

°C

16

16

16

16

Water temperature, outlet

°C

23.3

22

21.1

21

Pressure drop – water side

kPa

<3

<5

<8

<12

Total heating capacity

W

2780

3700

4490

5470

Room heating capacity

W

862

1136

1303

1422

Temperature of the air in the unit

°C

–12

–12

–12

–12

Supply air temperature

°C

37.2

37.0

35.6

33.3

Hot water flow rate

l/h

90

150

200

250

Water temperature, inlet

°C

60

60

60

60

Water temperature, outlet

°C

32.9

38.5

40.4

40.9

Pressure drop – water side

kPa

<3

<5

<7

<11

Sound power level LWA

dB(A)

31

36

41

46

Sound pressure level with 8 dB system attenuation

dB(A)

23

28

33

38


SCHOOLAIR-V (1800 mm) (sizing examples)

Supply air flow rate

m³/h

150

230

280

350

Fresh air flow rate

m³/h

150

230

280

350

Total cooling capacity

W

684

1060

1310

1590

Room cooling capacity

W

406

630

786

935

Temperature of the air in the unit

°C

32.0

32.0

32.0

32.0

Rel. humidity

%

40.0

40.0

40.0

40.0

Water content of the dry air

g/kg

11.9

11.9

11.9

11.9

Supply air temperature

°C

17.9

17.8

17.6

18.0

Condensation

g/h

0

0

0

0

Chilled water flow rate

l/h

60

120

180

210

Water temperature, inlet

°C

16

16

16

16

Water temperature, outlet

°C

25.8

23.6

22.3

22.5

Pressure drop – water side

kPa

1.1

3.8

8

10.4

Total heating capacity

W

2950

4230

4900

5630

Room heating capacity

W

907

1122

1150

1005

Temperature of the air in the unit

°C

–12.0

–12.0

–12.0

–12.0

Supply air temperature

°C

40.1

36.6

34.3

30.6

Hot water flow rate

l/h

100

170

200

210

Water temperature, inlet

°C

60

60

60

60

Water temperature, outlet

°C

34.4

38.4

38.8

36.8

Pressure drop – water side

kPa

4.8

12.3

16.5

18.1

Sound power level LWA

dB(A)

31

38

42

47

Sound pressure level with 8 dB system attenuation

dB(A)

23

30

34

39


SCHOOLAIR-V-HE (sizing examples)

Supply air flow rate

m³/h

150

200

240

360

Total heating capacity (without heat recovery)

W

2960

3820

4520

6020

Room heating capacity

W

671

781

890

675

Temperature of the air in the unit

°C

–16

–16

–16

–16

Supply air temperature

°C

35.4

33.7

33.1

27.5

Quantity of condensate

g/h

510

690

830

1180

Hot water flow rate

l/h

75

110

150

200

Water temperature, inlet

°C

60

60

60

60

Water temperature, outlet

°C

26

30

34

34

Pressure drop – water side

kPa

2.9

5.7

10.0

16.7

Sound power level LWA

dB(A)

36

40

43

50

Sound pressure level with 8 dB system attenuation

dB(A)

28

32

35

42


SCHOOLAIR-V-HV (sizing examples)

Supply air flow rate

m³/h

200

300

400

500

Total heating capacity (without heat recovery)

W

1300

1960

2530

3150

Room heating capacity

W

508

772

962

1169

Temperature of the air in the unit

°C

10.0

10.0

10.0

10.0

Supply air temperature

°C

28.6

28.7

28.2

28.0

Hot water flow rate

l/h

35

60

85

120

Water temperature, inlet

°C

60

60

60

60

Water temperature, outlet

°C

27.8

31.7

34.1

37.2

Pressure drop – water side

kPa

2

5

9.5

17


Supply and extract air unit with heat exchanger and heat recovery, secondary air option (based on air quality), for vertical installation on an external wall, e.g. adjacent to a window.

Special characteristics

  • Decentralised ventilation unit for high volume flow rates
  • Motorised shut-off dampers for fresh air and exhaust air, normally closed (NC) in order to prevent uncontrolled airflows
  • Demand-based ventilation and extract ventilation is possible by means of monitoring the room air quality and with dedicated control equipment
  • The type of heat exchanger for heat recovery depends on the unit variant: cross flow plate heat exchanger, cross counter flow plate heat exchanger including bypass damper with electric actuator (open-close or modulating) or rotary heat exchanger
  • Heat exchanger as 2-pipe or 4-pipe system, with G½" union nuts and flat seals
  • Meets the hygiene requirements of VDI 6022
  • Filter class: F7 for fresh air, G3 for extract air
  • Easy filter change with quick release fasteners, no tools required
  • Condensate drip tray with or without condensate drain
  • Compact construction, hence particularly suitable for refurbishment projects
  • Automatic switching to secondary air mode (only with an air quality sensor) if the room air quality (measured with the integral VOC sensor, for example) is between the previously defined range. The unit always starts in secondary air mode, which is more energy efficient.
  • Depending on the unit, an enthalpy heat exchanger for heat recovery may be used

Materials and surfaces

  • Casing, filter chamber cover, fans and levelling feet are made of galvanised sheet steel
  • Heat exchanger with copper tubes and aluminium fins
  • Heat exchanger for heat recovery made of aluminium or plastic (depending on variant)
  • Casing powder-coated, black (RAL 9005)
  • F7 filter medium made of moisture-resistant glass fibre paper (certified by Eurovent)
  • Mineral wool lining to DIN 4102, fire rating class A, faced with glass fibre fabric as a protection against erosion, effective with airflow velocities up to 20 m/s
  • Closed cell sealing strips

Construction

  • Powder-coated RAL 9005, black

Technical data

  • Width: 397 mm (2-pipe or 4-pipe), 600 mm (2-pipe or 4-pipe, 1800, HE and HV)
  • Height: 1800 mm (2-pipe or 4-pipe, 1800 version), 2000 mm (HE version), 2160 mm (2-pipe), 2200 mm (HV version), 2350 mm (4-pipe)
  • Depth: 359 mm (2-pipe or 4-pipe, 1800 version) 408 mm (2-pipe or 4-pipe HE and HV versions)
  • Fresh air flow rate: up to 500 m³/h
  • Supply air flow rate: up to 500 m³/h
  • Cooling capacity: up to 1685 W
  • Heating capacity: up to 6020 W
  • Max. operating pressure: 6 bar
  • Max. operating temperature: 75 °C
  • Sound power level: 31 – 50 dB(A)
  • Supply voltage: 230 V AC ±10 %, 50/60 Hz
  • Weight: from 80 kg
  • Rating: SCHOOLAIR-V-2L: 136 VA, SCHOOLAIR-V-4L: 117 VA, SCHOOLAIR-V-1800: 141 VA, SCHOOLAIR-V-HE: 208 VA, SCHOOLAIR-V-HV: ??? VA
  • Power consumption with nominal air volume: SCHOOLAIR-V-2L: 44 W, SCHOOLAIR-V-4L: 45 W, SCHOOLAIR-V-1800: 46 W, SCHOOLAIR-V-HE: 42 W, SCHOOLAIR-V-HV: ??? W

Sizing data

Fresh air

  • V_________________[m³/h]

Supply air

  • V_________________[m³/h]

Room cooling capacity

  • Q_________________[W]

Room heating capacity

  • Q_________________[W]


  • LWA_______________[dB(A)]

00248695_0

 Type
SCHOOLAIR-V       Vertical ventilation unit

 Variant
       No entry: standard
HE       High heat recovery percentage
HV       High volume flow rate

 Heat exchanger
2       2-pipe
4       4-pipe

 Condensate drip tray
       No entry: none
KM       with condensate drain

 Dimensions [mm]
       B × H × T
397 × 2160 × 359 (2-pipe)
397 × 2350 × 359 (4-pipe)
604 × 1800 × 359 (2- or 4-pipe, length 1800)
600 × 2000 × 408 (2- or 4-pipe, construction HE)
600 × 2200 × 408 (2- or 4-pipe, construction HV)

 Control system
       No entry: none
R       With

  Control function
MA       Master (room module and control module)
SL       Slave (control module)

 Real time clock
       No entry: none
       master only
T       With

 Interface
       No entry: none
       master only
B       BACnet MS/TP or Modbus RTU
L       LonWorks LON-FTT10

 

 Air quality sensor
       No entry: none
       master only
V       VOC sensor

 Supply air temperature sensor
Z       With

 Fresh air temperature sensor
       No entry: none
       master only
A       With

 Heating valve
HV       With

 Lockshield – heating circuit
R       With

 kVS value – heating valve
0,25
0,40
0,63
1,00
F0,50

 Cooling valve
       For 4-pipe systems only
KV       with

 Lockshield – cooling circuit
R       With

 kVS value – cooling valve
0,25
0,40
0,63
1,00
F0,50

Decentralised ventilation units are technically advanced products of high quality; they offer a wide range of configuration options. For specification details regarding your project please contact your nearest TROX branch or subsidiary.

 

Variants, Dimensions and weight

  • Variants
  • Dimensions and weight

Installation examples, Installation details, Basic information and nomenclature

  • Installation examples
  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Vertical installation (floor standing) on the façade system or an external wall, e.g. adjacent to a window
  • Level adjustment using the 4 levelling feet (+40 mm)
  • 1 adjustable mounting bracket to screw-fix the unit to the wall
  • Weather protection for the fresh air and exhaust air openings to be provided by others
  • The fresh air connection is provided by two ventilation openings in the façade system or external wall (to be provided by others), preferably sloping towards the outside
  • Free area of ventilation openings: 0.05 m² for each opening
  • Installation and connections to be performed by others; fixing, connection and sealing material to be provided by others
  • The water flow and return connections are on the right-hand side of the unit when seen from the room
  • Vents and drainage by others
  • The electrical connection is on the lower left when seen from the room
  • The under sill trim must not obstruct installation or deinstallation of the unit or maintenance access on the front of the unit

LN [mm]

Nominal length

LWA [dB(A)]

Sound power level

tPr [°C]

Primary air temperature

tWV [C°]

Water flow temperature – cooling/heating

tR [C°]

Room temperature

tR [C°]

Room temperature

tAN [C°]

Secondary air intake temperature

QPr [W]

Thermal output – primary air

Qtot [W]

Thermal output – total

QW [W]

Thermal output – water side, cooling/heating

VPr [l/s]

Primary air volume flow rate

VPr [m³/h]

Primary air volume flow rate

VW [l/h]

Water flow rate – cooling/heating

V [l/h]

Volume flow rate

∆tW [K]

Temperature difference – water

∆pW [kPa]

Pressure drop, water side

∆pt [Pa]

Total pressure drop, air side

∆tPr = tPr - tR [K]

Difference between primary air temperature and room temperature

∆tRWV = tWV - tR [K]

Difference between water flow temperature and room temperature

∆tWm-Ref [K]

Difference between mean water temperature and reference temperature

LN [mm]

Nominal length

Inducing displacement flow

The supply air is discharged near the external wall and with a medium velocity between 1.0 and 1.5 m/s. Due to the induction effect the supply air velocity is rapidly reduced such that, in cooling mode, the supply air displaces the room air over the entire floor area. The convection from people and other heat sources causes the fresh air from the pool to rise and create comfortable conditions in the occupied zone.

Heat exchanger

The maximum water-side operating pressure for all heat exchangers is 6 bar.

The maximum water flow temperature (heating circuit) for all heat exchangers is 75 °C; if flexible hoses are used, the water flow temperature should not exceed 55 °C. Units for other pressures and temperatures are available on request.

The water flow temperature (cooling circuit) should be at least 16 °C such that it does not permanently fall below the dew point. For units with a condensate drip tray the water flow temperature may be reduced to 15 °C.

Heat exchanger as 2-pipe system

Air-water systems with a 2-pipe heat exchanger may be used for either heating or cooling. In changeover mode it is possible to use all units within a water circuit exclusively for cooling in summer and exclusively for heating in winter.

Heat exchanger as 4-pipe system

Air-water systems with a 4-pipe heat exchanger may be used for both heating and cooling. Depending on the season, i.e. especially in spring and autumn, it may be possible that an office has to be heated in the morning and cooled in the afternoon.

References

Installation example SCHOOLAIR-V

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