QLI

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

v2.23.1.169

Application

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

Description

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

Schematic illustration of QLI

① Primary air spigot
② Heat exchanger
③ Water connections
④ Supply air grille
⑤ End cap
⑥ Primary air plenum with integral nozzles

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.

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

L_N	①	Primary air			②	Cooling				Heating
L_N	①	V_Pr		Δp_t	L_WA	2-pipe and 4-pipe systems				4-pipe system
L_N	①	V_Pr		Δp_t	L_WA	Q_tot	Q_WK	Δt_W	Δp_W	Q_WH = Q_tot	Δt_W	Δp_W
L_N	①	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
t_R	16 °C	22 °C
t_Pr	16 °C	50 °C
t_WV	26 °C	22 °C
V_W	110 l/h	50 l/h

Variants, Dimensions and weight

QLI-WHL

Dimensions [mm]

L_N	LA	LB	LC
900	940	883	975
1200	1240	1183	1275
1500	1540	1483	1575

Weights

L_N	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 and commissioning

Installation on an external wall
Installation under the sill

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

Principle of operation – QLI

L_N [mm]

Nominal length

L_WA [dB(A)]

Sound power level

t_Pr [°C]

Primary air temperature

t_WV [C°]

Water flow temperature – cooling/heating

t_R [C°]

Room temperature

t_R [C°]

Room temperature

t_AN [C°]

Secondary air intake temperature

Q_Pr [W]

Thermal output – primary air

Q_tot [W]

Thermal output – total

Q_W [W]

Thermal output – water side, cooling/heating

V_Pr [l/s]

Primary air volume flow rate

V_Pr [m³/h]

Primary air volume flow rate

V_W [l/h]

Water flow rate – cooling/heating

V [l/h]

Volume flow rate

∆t_W [K]

Temperature difference – water

∆p_W [kPa]

Pressure drop, water side

∆p_t [Pa]

Total pressure drop, air side

∆t_Pr = t_Pr - t_R [K]

Difference between primary air temperature and room temperature

∆t_RWV = t_WV - t_R [K]

Difference between water flow temperature and room temperature

∆t_Wm-Ref [K]

Difference between mean water temperature and reference temperature

L_N [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.

Downloads

product information

Product Data Sheet Type QLI

Product Data Sheet 1,1 MB pdf

certificates

EUROVENT certificate

Eurovent_ChilledBeams_CE_2020_09_DE_en_fr Certificate 160 KB pdf
Eurovent Certita Certification Active and Passive Chilled Beams

Active-and-Passive-Chilled-Beams_CE_EUROVENT_09.12.432_2023_09_DE_en_fr Certificate 200 KB pdf
Non-CE Manufacturer's statement QLI

QLI_NotCE_2022_02_08_14_17_09_DE_en Certificate 2,1 MB pdf

References

Installation example QLI

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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