Installation and operating instructions
Compact ceiling-mounted units KWL EC 220/340 D
2
GB
1.8
Application
– Operation
Compact ceiling units
KWL EC … D with heat recovery are suitable for the central ventilation of apartments
and small single-family houses. Equipped with easyControls, the innovative control concept for simpler
network connection and web browser operation. Equipped with a highly efficient plastic cross counter flow
heat exchanger with a heat recovery efficiency of , see chart:
Unit type
Target flow rate [m³/h]
80
100
120
KWL EC 220 D R/L
Heat recovery efficiency
> 80 %
80 %
80 %
KWL EC 340 D R/L
Heat recovery efficiency
-
-
-
The standard equipment permits the installation and the application in frost-free rooms > + 10 °C. If the unit
is to be used in other applications where high humidity, excessive dust, temperature in excess of 40 °C or
long periods at standstill (not running), please contact your local Helios dealer for advice. This also applies
for special technical and electrical applications.
IMPORTANT
☞
The ventilation unit must only be used according to its intended purpose!
1.9
Mode of operation
The KWL compact unit has a plastic cross counter flow heat exchanger, in which the outside air (fresh air)
crosses the extract building air, without coming into contact with each other. Through this procedure more
than 85 % of the extract air heat is transferred to the external air. The supply air is led by the duct system
to the primary (supply air needing) areas. The used air is extracted from the secondary areas (e.g. social
rooms, toilets, showers etc.). It flows back through the ducting to the ventilation unit, transfers the heat and
is discharged by the extract air duct into the atmosphere.
The efficiency depends on several factors. These are, among other things, the humidity of the air and the
temperature difference of the outside air and extract air. The volume flow can be regulated via the local
web server (included in the delivery). In addition, the KWL unit can also be operated via accessories. Two
control elements are available: KWL-BE and KWL-BEC.
Demand-based regulation can take place through the optional sensors KWL-VOC = air quality sensor,
KWL-CO
2
= carbon dioxide sensor or KWL-FTF = humidity and temperature sensor or through the
integrated weekly timer.
The electric pre-heater KWL-
EVH … D (accessories, Type … 220 D, Order No. 9636 or Type … 340 D,
Order No. 4241) heats the outside air at very low outside temperatures, and thus prevents the heat
exchanger from freezing and guarantees its safe function and optimum heat recovery, even in winter.
The supply air can also be heated by activating a power-regulated, external electric or hot water auxiliary
heater (accessories EHR-R... or WHR...). Another option is to cool the warmer outside air with the cooler
unit extract air.
The summer bypass is the optimum solution to conduct cooler outside air into the building during warm
periods. The air is optimally pre-filtered through the integrated filter, which ensures a hygienic unit and
simultaneously guarantees the durability of the KWL unit. A G4 filter (optional F7 pollen filter) is connected
upstream from the outside air as standard and a G4 filter is connected upstream from the extract air.
TIP!
Replacement air filters can be ordered online at
www.ersatzluftfilter.de
1.10
Performance data
In order to achieve the appropriate performance data (volume flow, sound, current consumption and max.
pressure), ventilation must take place correctly (outside air/supply air and extract air/outgoing air). The
ventilation duct must be dimensioned accordingly. The filters must also be replaced regularly to maintain
optimum performance. The proper installation and adjustment of all components (units and peripheral
devices) are extremely important.
TIP!
Helios offers regular practical workshops on this topic; here you will find all the important details in a
practical environment. The dates can be found on our website www.heliosventilatoren.de under training.
Deviating versions, unfavourable installation and operating conditions can lead to the reduction of output
or an increased sound level. The figures for the air-side sound are recognised as A-weighted sound power
level LWA (corresponds to DIN 45635, T.1). The figures in A-weighted sound pressure LPA are influenced
by room and installation-specific factors. Accordingly, there are deviations in the figures.
1.11
Fireplaces
The simultaneous use of controlled ventilation (KWL units) and room-air dependent fireplaces (tiled stove,
gas-fired boiler, etc.), requires the observance of all applicable rules. In apartments, which are airtight
according to the state of technology, a room-air dependent fireplace may only be operated with a separate
combustion air supply; KWL units and fireplaces can only be operated based on demand when they are
decoupled.
The relevant applicable rules for the joint operation of fireplaces, ventilation, extraction hoods (Federal
Association of Chimney Sweeps (ZIV)) must be observed!
IMPORTANT
☞
– General building regulation requirements
The KWL units with heat recovery can only be installed and operated in rooms with other room air-
dependent fireplaces if the exhaust duct is monitored by special safety devices (by client), which switch off
the KWL unit when activated. The KWL unit will be switched off until the fireplace is no longer active. In the
process, it is important to ensure that the underpressure does not exceed 4 Pa in the residential unit by
operating the KWL unit.
