Connecting Spigots; Air Ducting, Ventilation Circuit; Unit Insulation; Electrical Connection - Helios KWL EC 500 W ET R Notice De Montage Et D'utilisation

Installation and Operating Instructions
EN
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ATTENTION
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WARNING
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IMPORTANT NOTE
Compact wall-mounted units KWL EC 500 W ET R/L
2 .5

Connecting spigots

The units are supplied with four spigots (diameter 160 mm). A secure and tight connection to the spigots is required
(e.g. IsoPipe IP-160) the connector RVBD 160 K (Ref. no. 3415) must be used in this respect. The arrangement of the
ventilation duct can be seen from figures 24/25.
Right
unit
Wall
Front
Outside air
Supply air
Extract air
2 .6

Air ducting, ventilation circuit

When designing the ductwork, use the shortest possible runs. Airtight connections and changeovers must be ensured
for the best possible heat recovery. To avoid pressure losses, dirt build-up and noise, use smooth ducts. The following
duct diameter DN 160 mm (e.g. isolated pipe system Iso-Pipe IP-125, accessories) is to be planned for main lines (out
side, extract air, supply air distributor, extract collector), and the diameter is reduced accordingly for branch lines.
The supply air is led to the living and bedrooms and the extracted air is led from the secondary areas. In order to reduce
condensation in the outside and outgoing air pipes, and any pre-heating coils and filter boxes, these are to be insulated
in an appropriate way. The minimum insulating thicknesses in accordance with DIN EN 1946-6, 05/2009 must be
observed. If supply and extract air ductwork run through unheated rooms, insulation must be provided to reduce heat
losses. To balance the whole system, supply and extract openings should be provided with adjustable valves (accesso-
ries). During extraction of polluted extract air, a filter (accessories) is to be connected. The installation of kitchen hoods
to the system (cause: dirt, fire danger, hygiene) is not permitted. To ensure air circulation within the room, sufficient
overflow openings (door gap, door grilles) are to be planned.
Any fire and building regulations must be observed .
2 .7

Unit insulation

If installed in heated rooms and higher humidity condensation can occur at the outside of the unit in the outside and
exhaust air area. In this case a water-vapour-tight insulation is to be attached laminar in this area. Furthermore the out-
side and outgoing air ductwork should be insulated sufficiently.
If installed in non-heated areas (e.g. frost-protected attic) a sufficient insulation outside on the unit is to be installed all
around. Otherwise condensate formation could occur on the housing sides. The condensate removal must be installed
frost-protected, perhaps with a heater.
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2 .8

Electrical connection

The unit must be fully isolated from the mains power supply before any maintenance or installation work or
opening the terminal compartment! The electrical connections must be carried out in accordance with the
relevant wiring diagram and are only to be carried out by certified electricians . All relevant standards, safety
regulations (e .g . DIN EN VDE 0100) and the technical connection conditions of the electrical supply company
must be observed .
If the internal terminal box is opened (e .g . fuse replacement, battery replacement, etc .), then the KWL unit must
be fully isolated from the mains power supply!
– 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 .
According to DIN EN 60335-1 / VDE 0700 T1 7.12.1, a main switch and isolator (Accessories RHS 3+1 Order No.
1594) must be integrated in the unit supply cable and, in this respect, the minimum requirement of a 3 mm contact ope-
ning must be fulfilled. The main switch and isolator or the FI must be protected against being restarted by appropriate
means. If a residual current circuit breaker is installed in the supply line of the KWL unit, the residual current circuit breaker must
have the following technical features: Type A or B with a rated differential current of 30 mA
The KWL unit has a leakage current of ≤ 3.5 mA (calculated according to DIN EN 50178, image 4).
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ATTENTION:
1. The KWL unit is designed for fixed connection only, a plug connection is not permitted
2. The PE connection must be designed with 2 wires of at least 1.5 mm² or one 10 mm² wire.
The KWL EC 500 W ET R/L models have a door contact switch and if the front door is removed, the internal terminal
box is fully isolated from the power supply. In this way, normal maintenance work (checking the condensation outlet,
filter change, enthalpy heat exchanger cleaning, installation of the preheater (accessories) is possible. The owner may
carry out maintenance work on the unit.
With regard to the flush mounting of the control elements, deep flush-mounted boxes are required . The follo-
wing sensors can be used as accessories: KWL-CO2, KWL-VOC or KWL-FTF .
The BUS components can be connected in series in any order . A star-shaped distribution is not possible .
Depending on the number of BUS components and cable lengths, the corresponding cable cross-sections
must be selected, see also SS-1045, SS-1077 and SS-1079 .
Fig .24
Left
unit
Exhaust air
8
Wall
Front
Exhaust air
Extract air
Supply air
Outside air
Fig .25