Maintenance; Filter And Heat Recovery Cell; Fans And Preheating Radiator - Helios KWL 500 W ET Notice De Montage Et D'utilisation

MAINTENANCE

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ATTENTION: All work only in dead state! Before maintenance an
isolator is required for with a minimum of 3 mm contact opening
of each pole. Electrical connection should only be carried out by a
qualified person.

Filter and heat recovery cell

• When the Maintenance reminder turns on the indicator
lamp in the control panel, check the filters. Outdoor air
is filtered in the unit with two separate filters. A coarse filter
(A) of class G4 filters off insects, rough pollen and other
dust. A fine filter (B) of class F7 filters off invisible dust.
Extract air is filtered with a filter (C) of class G4.
• Clean the coarse filters (A and C) by washing them at least
twice a year.
• When you open the door of KWL EC/ET 500 Pro, the security
switch turns voltage off. Filters can now be pulled out. Wash
the coarse filters with +25…30 °C warm water and
washingup liquid, pressing them smoothly. Do not handle
the filters with force. When washing is done properly, filters
stand cleaning 4…5 times. In other words, you have to
replace them at least every years or when needed.
• The fine filter is not washable. Clean it at the same time
as the coarse filters, using the brush nozzle of a vacuum
cleaner. When cleaning, be careful no to break filter
material. To ensure good supply air quality, replace the
filter at least once a year or more often, depending on
local air quality. It is recommended to replace filters in the
autumn. This way the filters stay cleaner through the winter
and can effectively filter off dust in the following spring.
Filters can be ordered via internet: www.ersatzluftfilter.de
• It is recommended to clean the cross-counter exchanger
(D) annually and at the latest every 2 years. For this pull
out the sealing strip (H), lift the exchanger and take it out
of the unit. Handle the thin fins of the cross-counter
exchanger carefully. Afterwards vacuum-clean the surface
of the exchanger.
ATTENTION: Do not clean cross counterflow heat exchanger with
water !
To assemble, lift and push at the same time the exchanger
and place it on the sealings below. Insert sealing strip (H)
again and check fit of sealing.

Fans and preheating radiator

• The supply and extract air fans (E and F) have been fastened with rubber collars. When
removing the fans for maintenance, release the ear fixed to the fan over the collar flange
by bending it upwards. Remove the rubber collar from the opening and turn the fan so
that it can be removed. Remove the plug behind the fan. Clean the fan blades with
compressed air or with brush. Each blade has to be so clean that the fans stay balanced.
Take care not to remove the balancing pieces attached to the fan blade.
• If you use water in cleaning, do not let it flow to the electrical parts.
Condsensing water outlets
• During the heating season, humidity of extract air condenses to water. Water formation
can be abundant in new buildings, during baths and when wet clothes are being aired.
• Condensing water needs to flow out from the ventilation unit without hindrance. In
connection with maintenance, e.g. in the autumn before the beginning of the heating
season, make sure that the condensing water outlet (ball syphon) in the bottom reservoir
is not clogged.
You may check it by pouring a little water in the reservoir. Do not let water flow to the
electrical parts.
B
E
19
G
A
C
H
F
Coarse Filter G4
A
Fine filter F7
B
Coarse filter F4
C
Heat recovery cell
D
Supply air fan
E
Extract air fan
F
D
Door
G
Sealing strip
H