2.3 Connecting spigots
The units are supplied with four spigots (diameter 160 mm). A secure and tight connection to the spigots is required
(e.g. Iso-Pipe IP-160), the pipe connector RVBD 160 (Order No. 9641) must be used in this respect. The arrangement
of the ventilation duct can be seen from figures 15/16, depending upon the model.
2.4 Air ducting, ventilation circuit
When planning and designing the ductwork, use 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 270 W R/L | KWL EC 370 W 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 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 over-
flow openings (door gap, door grilles) are to be planned.
Any 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
outgoing 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.
2.6
Electrical connection
All work must be carried out with the equipment fully isolated from the power supply. The electrical connec-
tions are to be carried out in accordance with the relevant wiring diagram and are only to be carried out by cer-
tified 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)
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.
If a residual current circuit breaker is installed in the supply line of the KWL EC 270 W, 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).
If a residual current circuit breaker is installed in the supply line of the KWL EC 370 W, 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).
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 270/370 W 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, fil-
ter change, heat exchanger cleaning, installation of the preheater (accessories) is possible. The owner may carry out
maintenance work on the unit.
Please hand the circuit diagrams to the installer!
Always use deep flush-mounted boxes for the control elements or the sensors (KWL-CO
2
, 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-
1077 or SS-1079) depending on the number of bus components and cable lengths.
7
Passive house compact units KWL EC 270/370 W R/L
Installation and Operating Instructions
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Fig.15
Fig.16
Wall
Front
Wall
Front
ATTENTION
IMPORTANT NOTE
☞
EN
KWL EC 270 W
KWL EC 370 W
