Chapter 3 Service And Maintenance; Service And Maintenance; Enthalpy Heat Exchanger; Filter Change - Helios KWL EC 500 W ET R Notice De Montage Et D'utilisation

Installation and Operating Instructions
EN
CHAPTER 3
SERVICE AND
MAINTENANCE
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WARNING
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ATTENTION
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IMPORTANT
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IMPORTANT
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NOTE
Compact wall-mounted units KWL EC 500 W ET R/L
3 .0

Service and maintenance

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The unit must be fully isolated from the power supplybefore all maintenance and installation work or before
opening the terminal compartment! Risk of electric shock, moving parts (fans) and hot surfaces!
– Allow the unit to cool down or wait for five minutes until the fans have turned off .
– Risk of electric shock, moving parts (fans) and hot surfaces .
3 .1

Enthalpy heat exchanger

Open and remove both upper snap-in hooks on the front cover.
Pull the terminal strip of the heat exchanger forward (Fig.27).
Then carefully remove the enthalpy heat exchanger from the unit (Fig.28).
Brush the blades with a single nozzle and a vacuum cleaner to clean the exchanger.
Do not use aggressive cleaning products!
When installing, insert the enthalpy heat exchanger into the guide rails and slide in up to the stop. Ensure that the rub-
ber lips are not damaged by mounting! Then re-insert terminal strip.
Terminal strip
3 .2

Filter change

In order to change the filters, open and remove both upper snap-in hooks on front cover. Then remove the outside air
and extract air filter from the metal rails (Fig. 29/30).
When using F7 filters/activated carbon filters, pay attention on air flow direction arrows on the filter labels! The
air flow direction is shown on the unit label (Fig .29) .
Outside air filter
Extract air filter
– Filter
The KWL compact unit is equipped with outside and extract air filter class G4 as standard (to DIN EN 13779):
• Outside air/extract air:
2 pcs. Spare filter Course G4
1 pc. Spare filter Fine F7
1 pc. Activated carbon filter (instead of F7 filter) ELF-KWL 500 AK
The filters are to be checked regularly (see controller display, factory setting every 6 months) depending on the
degree of pollution (development of mildew), to be cleaned if necessary . By vacuuming once or after a maxi-
mum of 1-year operation they must be replaced for hygienic reasons .
If the filters become moist or mouldy, they must be changed immediately!
Fig .27
Fig .29
Label
ELF-KWL 500/4/4
ELF-KWL 500/7
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Fig .28
Fig .30
Ref . no . 0039
Ref . no . 0042
Ref . no . 4199