Connecting Spigots; Air Ducting, Ventilation Circuit; Unit Insulation; Electrical Connection - Helios KWL EC 220 D R Instructions D'installation Et D'utilisation

Installation and operating instructions
GB
ATTENTION
WARNING
WARNING
IMPORTANT NOTE
Compact ceiling-mounted units KWL EC 220/340 D
2.3

Connecting spigots

The units are supplied with four connecting spigots (KWL EC 220 D R/L = diameter 125 mm; KWL EC
340 D R/L = diameter 160 mm). A secure and tight connection to the spigots is required (e.g. Iso-Pipe
IP-125 or IP-160), the connector RVBD 125 (Order No. 9640) must be used in this respect. The
arrangement of the ventilation duct can be seen on page 13, 42-45 depending upon the unit type from
the dimensional drawings.
2.4

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
- KWL EC 220 D R/L > DN 125 mm (e.g. isolated pipe system Iso-Pipe IP-125, accessories)
- KWL EC 340 D R/L > DN 160 mm (e.g. isolated pipe system Iso-Pipe IP-160, accessories)
is to be planned for main lines (outside, extract air, supply air distributor, extract collector), and the ø
is reduced accordingly for branch lines.
The supply air is led to the primary areas 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 German Institute for Standardization EN in 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.
Fire and building regulations must be observed.
2.5

Unit insulation

If installed in heated rooms and higher humidity condensation can occur at the outside of the unit in
the outside and extract air area. In this case a water-vapour-tight insulation is to be attached laminar
in this area. Furthermore the outside 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.
Furthermore, the outside air and outgoing air ducts, and any pre-heating coils and filter boxes must
be sufficiently insulated on site.
2.6

Electrical connection

All work must be carried out with the equipment fully isolated from the power supply. The
electrical connections are to be carried out in accordance with the relevant wiring diagram and
are only to be carried out by certified electricians. All relevant national standards, safety
regulations and provisions (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 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) or a residual current circuit breaker model: FI 300 mA 2 Type B or B+ must be
integrated in the unit supply cable and, in this respect, the minimum requirement of a 3 mm contact
opening must be fulfilled. The main switch and isolator or the FI must be protected against being
restarted by appropriate means.
The KWL EC 220/340 D 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, heat exchanger cleaning, installation of the pre-
heater (accessories)) is possible. The owner may carry out maintenance work on the unit.
2.7 Assembly of electric pre-heater (accessories) – standard version of right-hand units
In order to assemble the electric pre-heater (accessories), connect the electrical connectors (Fig.20).
Then push the electric pre-heater up to the stop in the unit (Fig.21) and connect earthing screw.
Do not lay cable on heating element!
Please hand the circuit diagrams to the installer!
☞
Always use deep flush-mounted boxes for the control elements or the sensors (KWL-CO
KWL-VOC or KWL-FTF). The control line must always be inserted in an empty conduit M 25. It
is important to ensure that the wiring is connected in series and not radially. A deviating
control line must be installed (see circuit diagram SS-1043) depending on the number of bus
components and cable lengths.
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