Application - Operation; Mode Of Operation; Performance Data; Fireplaces - Helios KWL EC 270 W R Instructions D'installation Et D'utilisation

Installation and operating instructions
GB
IMPORTANT ☞
IMPORTANT ☞
IMPORTANT ☞
Passive house compact units KWL EC 270/370 W R/L
1.8 Application – Operation
KWL EC 270/370 W R/L compact units with heat recovery are suitable for the central ventilation of
apartments and small single-family houses, also in passive house standard (PHI). 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.
The standard equipment permits the installation and the application in frost-free rooms > + 5 °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.
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 extracted building air, without coming into contact with each other. Through this procedure, the
majority of the extracted air heat is transferred to the outside 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 = carbon dioxide sensor or KWL-FTF = humidity and temperature sensor or through the
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integrated weekly timer.
The electric pre-heater EHR-R 1.2/160 (accessories, Order No. 9434) 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.
Helios offers regular practical workshops on this topic; here you will find all the important details in a
TIP!
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.
1.11

Fireplaces

The relevant applicable rules for the joint operation of fireplaces, ventilation, extraction hoods
(Federal Association of Chimney Sweeps (ZIV)) must be observed!
– 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.
The KWL unit must not be operated at the same time as solid fuel fireplaces and not in residential units
with room air-dependent fireplaces, which are connected to multiple exhaust systems. Any existing
combustion air ducts and exhaust systems for solid fuel fireplaces must be capable of being shut off for
the proper operation of the ventilation system established with a ventilation unit with heat recovery.
This can lead to deviations in the figures.
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