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3.5.1 Planning safety measures
Together with the relevant authorities, engineers plan the safety
measures that are required for simultaneous operation of a
ventilation unit and combustion equipment.
Alternate operation
Alternate operation means that, when the combustion equip-
ment is commissioned, the mechanical ventilation system is
switched off and/or cannot be started. Alternate operation must
be ensured by appropriate measures, e.g. automatically en-
forced shutdown of the ventilation unit.
Simultaneous operation
Do not use differential pressure switches in which the pressure
differential between the outdoor air pressure and the pressure
in the combustion equipment installation room serves as a re-
sponse criterion. A fault can arise from excessively frequent
switching.
For simultaneous operation of combustion equipment and a
mechanical ventilation system, we recommend choosing ap-
proved room sealed combustion equipment (in Germany, with
DIBt approval).
If open flue combustion equipment is operated in the dwelling
at the same time as a ventilation unit, combustion exhaust gases
must be prevented from penetrating the home as a result of
possible negative pressure in the room.
The ventilation unit may only be operated in combination with
intrinsically safe combustion equipment. This combustion
equipment has, for example, a draught hood or an exhaust gas
monitor and is approved for operation in conjunction with vent-
ilation units.
Alternatively, external, tested safety equipment can be connec-
ted to monitor the operation of the combustion equipment.
For example, you can install differential pressure monitoring to
monitor the chimney draught and to switch off the ventilation
unit in the event of a fault.
The equipment for differential pressure monitoring must fulfil
the following requirements:
– Monitoring of the differential pressure between the connec-
tion piece to the chimney and the room where the combus-
tion equipment is installed.
– Possibility of matching the shutdown value for the differen-
tial pressure to the minimum draught requirement for the
combustion equipment
– Floating contact to switch off the ventilation function
– Option to connect a temperature capturing device to ensure
that differential pressure monitoring is enabled only when
the combustion equipment is in operation, and that un-
wanted shutdowns due to environmental influences are
prevented
3.5.2 Commissioning in buildings with combustion equipment
When commissioning the ventilation unit, it is important to
check and document in the commissioning log that combustion
exhaust gases are not penetrating the dwelling in a quantity
that is harmful to health.
Commissioning in Germany
Acceptance is carried out by the local flue gas inspector.
Commissioning outside Germany
Acceptance must be carried out by a specialist. In case of doubt,
you must involve an independent expert in the acceptance pro-
cedure.
www.stiebel-eltron.com
Appliance description
3.5.3 Maintenance of the combustion equipment
Regular maintenance of the combustion equipment is obligat-
ory. Maintenance includes checking the exhaust gas extraction
system, the free pipe cross-sections and the safety equipment.
The qualified contractor responsible must verify that there is a
sufficient flow of combustion air.
3.6
EU Declaration of Conformity
STIEBEL ELTRON GmbH & Co. KG hereby declares that the radio
equipment type LWZ-W 450/600 complies with Directive
2014/53/EU. The full text of the EU Declaration of Conformity can
be found at the following internet address:
www.stiebel-eltron.de
4
Appliance description
4.1
Standard delivery
– 1× wall mounting bracket
– 2× star grips used as spacers
– 1× condensate hose
– 1× hose clip
– 1× mounting bend
– 1× "Air connection for left-hand version" sticker
– 1× wall mounted enclosure (for fitting the internal pro-
gramming unit to the wall)
– 1× blank cover (to seal the upper front panel when the pro-
gramming unit is fitted to the wall)
4.2
Accessories
You can obtain ventilation pipes, extract air and supply air vents
and similar accessories from us.
4.2.1 Optional accessories
– Programming unit (with wall mounted enclosure) FEB 2.1
LWZ-W 450 Premium, LWZ-W 600 Premium
– Enthalpy heat exchanger LWTF W450/600
4.2.2 Maintenance accessories
– Replacement filter set (see chapter Filter [} 60] )
4.3
Function description
The appliance draws in outdoor air with a fan. A second fan
withdraws extract air from rooms that are subject to odours or
moisture, e.g. kitchen, bathroom, WC. The extract air and out-
door air are routed through separate air ducts. The extract air
and outdoor air are each passed through a filter.
The extract air and outdoor air flow through a cross-countercur-
rent heat exchanger. Heat is recovered from the extract air and
transferred to the outdoor air. This enables a large proportion of
thermal energy to be recovered.
Operating
Fan set-
Description
mode
ting
Humidity pro-
0
Necessary ventilation to ensure that
tection
the building structure is protected
under normal conditions of use with
somewhat reduced moisture loads,
e.g. during temporary absence of the
user and no drying of washing in the
residential unit
Reduced
1
Reduced ventilation is the ventilation
ventilation
necessary to meet hygiene standards
and ensure protection of the building
structure (moisture level) under nor-
mal conditions of use with partially
LWZ-W 450/600 Premium |
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