Type QLI

Induction-type displacement flow diffuser in nominal lengths of 900, 1200 and 1500 mm, with vertical heat exchanger and condensate drip tray

Induction-type displacement flow diffuser with 2-pipe or 4-pipe heat exchanger, for installation under a sill. The condensate drip tray is useful if the temperature temporarily falls below the dew point.

  • High heating and cooling capacity with a low conditioned primary air volume flow rate and low sound power level
  • High comfort levels due to low airflow velocity in the occupied zone
  • Three nozzle variants to optimise induction based on demand
  • Two different heat exchanger positions


Optional equipment and accessories

  • Control equipment
  • Fixing systems for wall or floor fixing, fixing systems for both wall and floor fixing
  • Powder coating in many different colours, e.g. RAL CLASSIC

QLI 00137246_0


  • Application
  • Description

Application

  • Induction-type displacement flow diffusers of Type QLI for installation under a sill
  • High comfort levels due to low-turbulence airflow and low airflow velocity in the occupied zone
  • Displacement flow
  • Choice of location for primary air spigot at a narrow side; end cap may have to be changed accordingly
  • 2-pipe or 4-pipe heat exchangers enable good comfort levels with a low conditioned primary air volume flow rate
  • Energy-efficient solution since water is used for heating and cooling

Special characteristics

  • Low-turbulence supply air discharge as displacement flow
  • Vertical heat exchanger as 2-pipe or 4-pipe system, optional condensate drip tray including condensate drain that can be connected to a condensate pipe (to be provided by others)
  • Water connections at the narrow side, Ø12 mm Cu pipe, either with plain tails or with external thread or union nut, G½", flat seal

Nominal sizes

  • 900, 1200, 1500 mm

Variants

  • WVL: Heat exchanger at the front, water connections on the left
  • WVR: Heat exchanger at the front, water connections on the right
  • WHL: Heat exchanger at the rear, water connections on the left
  • WHR: Heat exchanger at the rear, water connections on the right


Heat exchanger

  • 2: 2-pipe systems
  • 4: 4-pipe systems


Nozzle variants

  • M: Medium
  • G: Large
  • U: Extra large

Construction

  • Galvanised
  • P1: Powder-coated RAL 9005, black, gloss level 70 %

Attachments

  • Water connection A1: G½" external thread and flat seal
  • Water connection A2: G½" union nut and flat seal
  • Condensate drip tray

Accessories

  • W0: Wall fixing
  • B0: Floor fixing
  • WB: Wall and floor fixing

Useful additions

  • Connecting hoses
  • Control equipment consisting of a control panel including a controller with integral room temperature sensor; valves and valve actuators; and lockshields
  • X-AIRCONTROL control system
  • Choice of ventilation grille from our portfolio

Construction features

  • Spigot is suitable for circular ducts to EN 1506 or EN 13180
  • Three nozzle variants to optimise induction based on demand
  • Vent valves on the heat exchanger

Materials and surfaces

  • Casing, supply air grille, and primary air plenum with punched nozzles are made of galvanised sheet steel
  • Exposed surfaces either galvanised or black (RAL 9005)
  • Heat exchanger with copper tubes and aluminium fins

Standards and guidelines

  • Products are certified by Eurovent (no. 09.12.432) and listed on the Eurovent website
  • Declaration of hygiene conformity to VDI 6022

Maintenance

  • No moving parts, hence low maintenance
  • The heat exchanger can be vacuumed with an industrial vacuum cleaner if necessary
  • VDI 6022, Part 1, applies (Hygiene requirements for ventilation and air-conditioning systems and units)

Technical information

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

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

Functional description

Induction-type displacement flow diffusers provide centrally conditioned primary air (fresh air) to the room and use heat exchangers for cooling and/or heating.

The primary air is discharged through nozzles and induces secondary air (room air), which passes through the heat exchanger.

Primary and secondary air mix and are then supplied to the room, causing only very little turbulence.

Nominal length

900, 1200, 1500 mm

Length

975, 1275, 1575 mm

Height

729 mm

Width

195 mm

Primary air volume flow rate

4 – 50 l/s or 14 – 180 m³/h

Cooling capacity

Up to 1000 W

Heating capacity

Up to 750 W

Max. operating pressure, water side

6 bar

Max. operating temperature, water side

75 °C


The quick sizing table contains operating points for defined reference units. For other operating points you may use the Easy Product Finder design software.

Quick sizing

LN Primary air Cooling Heating
LN VPr Δpt LWA 2-pipe and 4-pipe systems 4-pipe system
LN VPr Δpt LWA Qtot QWK ΔtW ΔpW QWH = Qtot ΔtW ΔpW
LN l/s m³/h Pa dB(A) W K kPa W K kPa

900

M

4

14

53

<20

237

188

1.5

3.1

228

3.9

0.2

900

M

6

22

121

24

332

260

2.0

3.1

314

5.4

0.2

900

M

8

29

217

32

415

318

2.5

3.1

386

6.6

0.2

900

G

7

25

40

<20

317

233

1.8

3.1

281

4.8

0.2

900

G

11

40

102

22

456

323

2.5

3.1

392

6.7

0.2

900

G

15

54

191

31

571

391

3.1

3.1

474

8.2

0.2

900

U

17

43

42

<20

387

242

1.9

3.1

293

5.0

0.2

900

U

19

68

108

28

550

321

2.5

3.1

389

6.7

0.2

900

U

26

94

204

37

677

364

2.8

3.1

441

7.6

0.2

1200

M

5

18

45

<20

293

233

1.8

3.8

281

4.8

0.3

1200

M

8

29

117

23

431

335

2.6

3.8

406

7.0

0.3

1200

M

11

40

222

32

548

416

3.3

3.8

505

8.7

0.3

1200

G

9

32

37

<20

401

293

2.3

3.8

355

6.1

0.3

1200

G

15

54

106

23

601

420

3.3

3.8

510

8.8

0.3

1200

G

21

46

208

33

761

508

4.0

3.8

618

10.6

0.3

1200

U

16

58

45

<20

506

313

2.4

3.8

379

6.5

0.3

1200

U

25

90

112

31

709

408

3.2

3.8

495

8.5

0.3

1200

U

34

122

207

40

871

461

3.6

3.8

560

9.6

0.3

1500

M

6

22

41

<20

347

275

2.2

4.5

333

5.7

0.4

1500

M

10

36

115

23

526

405

3.2

4.5

492

8.5

0.4

1500

M

14

50

228

33

674

505

3.9

4.5

614

10.6

0.4

1500

G

11

40

36

<20

483

350

2.7

4.5

424

7.3

0.4

1500

G

19

68

111

25

737

508

4.0

4.5

618

10.6

0.4

1500

G

27

97

225

35

939

613

4.8

4.5

747

12.9

0.4

1500

U

20

72

49

23

621

380

3.0

4.5

461

7.9

0.4

1500

U

28

101

98

33

802

464

3.6

4.5

564

9.7

0.4

1500

U

36

130

163

41

956

521

4.1

4.5

634

10.9

0.4

① Nozzle variant ② Air-regenerated noise


Reference values

Parameter Cooling Heating

tR

16 °C

22 °C

tPr

16 °C

50 °C

tWV

26 °C

22 °C

VW

110 l/h

50 l/h


Induction-type displacement flow diffuser of Type QLI, with one-way discharge and high thermal output, providing high thermal comfort levels.

For installation on a wall or under the sill

The units consist of a casing with a primary air plenum, spigot, non-combustible nozzles, and vertical heat exchanger; a condensate drip tray is optional.

Special characteristics

  • Low-turbulence supply air discharge as displacement flow
  • Vertical heat exchanger as 2-pipe or 4-pipe system, optional condensate drip tray including condensate drain that can be connected to a condensate pipe (to be provided by others)
  • Water connections at the narrow side, Ø12 mm Cu pipe, either with plain tails or with external thread or union nut, G½", flat seal

Materials and surfaces

  • Casing, supply air grille, and primary air plenum with punched nozzles are made of galvanised sheet steel
  • Exposed surfaces either galvanised or black (RAL 9005)
  • Heat exchanger with copper tubes and aluminium fins

Construction

  • Galvanised
  • P1: Powder-coated RAL 9005, black, gloss level 70 %

Technical data

  • Nominal length: 900, 1200, 1500 mm
  • Length: 975, 1275, 1575 mm
  • Height: 729 mm
  • Width: 195 mm
  • Primary air volume flow rate: 4 – 50 l/s or 14 – 180 m³/h
  • Cooling capacity: up to 1000 W
  • Heating capacity: up to 750 W
  • Max. operating pressure: 6 bar
  • Max. operating temperature: 75 °C

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

00134630_0

 Type
QLI       Under sill induction unit

 Heat exchanger
2       2-pipe
4       4-pipe

 Nozzle variants
M       Medium
G       Large
U       Extra large

 Arrangement of heat exchanger and water connections
WVL       Heat exchanger at the front, water connections on the left
WVR       Heat exchanger at the front, water connections on the right
WHL       Heat exchanger at the rear, water connections on the left
WHR       Heat exchanger at the rear, water connections on the right

 

 Condensate drip tray
       No entry: none
KW       With

 Nominal length [mm]
900
1200
1500

 Fixing material (supplied separately)
       No entry: none
W0       Wall fixing
B0       Floor fixing
WB       Wall and floor fixing

 Surface of casing and heat exchanger
       No entry: untreated
G1       Casing powder-coated, heat exchanger coated RAL 9005, jet black
G2       Heat exchanger coated RAL 9005, jet black

 Valves and actuators
       No entry: none
VS       With

QLI–2–G–WVL/1200

Heat exchanger

2-pipe

Nozzle variant

Medium

Arrangement of heat exchanger and water connections

Ø12 mm pipe, plain tails

Nominal length

1200 mm


QLI–4–U–WHR–KW/1200/WB/P1/VS

Heat exchanger

4-pipe

Nozzle variant

Extra large

Arrangement of heat exchanger and water connections

At the rear, water connections on the right

Condensate drip tray

With

Nominal length

1200 mm

Fixing

Wall and floor fixing

Surface

Powder-coated black

Valves and actuators

With


 

Variants, Dimensions and weight

  • Dimensions and weight

Dimensions [mm]

LN LA LB LC

900

940

883

975

1200

1240

1183

1275

1500

1540

1483

1575


Weights

LN mm 900 1200 1500

Unit

kg/piece

18

24

30

Contained water (max.)

kg

1.8

2.4

3


Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Installation on an external wall
  • Installation under the sill
  • Installation and connections to be performed by others; fixing, connection and sealing material to be provided by others
  • The unit can be fixed to the floor and/or to the wall with the fixing material supplied (accessory)
  • Heat exchangers are fitted with water flow and water return connections at the narrow side

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

Displacement flow ventilation

The supply air is discharged into the space with a velocity between 0.15 and 0.20 m/s and as close as possible to the floor; the result is a pool of fresh 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. Displacement ventilation is characterised by low airflow velocities and low turbulence. The air quality in the occupied zone is very high. The extract air should ideally be removed near the ceiling.

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.

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