OPERATION
Appliance description
4 | LWZ304-404 SOL www.stiebel-eltron.com
!
WARNING Injury
The appliance may be used by children over 8 years of
age and persons with reduced physical, sensory or men-
tal capabilities or a lack of experience and expertise,
provided that they are supervised or they have been
instructed on how to use the appliance safely and have
understood the potential risks. Children must never play
with the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they are
supervised.
Note
The appliance is pressurised. During the heat-up process,
expansion water will drip from the safety valve.
If water continues to drip when heating is complet-
ed, please inform your qualified contractor.
!
WARNING Injury
If there is a radio or police announcement ordering win-
dows and doors to be kept closed, simply select fan stage
“0” (= fan off) for several hours.
The programming unit must be activated if the appliance
has been out of operation for a long time:
Hold down “MENU” button for three seconds.
If you have already navigated through the menu
tree, pressing MENU will return you to the default
display. If necessary you may have to press menu
several times.
Slide your finger along the scroll wheel until you
reach the “VENTILATION STAGES” entry.
Press “OK”.
Press “OK” again to adjust the “UNSCHEDULED
VENT.” parameter.
Set the “UNSCHEDULED VENT.” parameter to 0 by
sliding your finger anti-clockwise over the scroll
wheel.
Confirm with “OK”.
Set the “UNSCHED. VENT TIME STAGE 0” parameter
to a suitable value.
Note
Do not change any system-specific settings at the control
unit. Your qualified contractor has set the control unit
to match the local conditions for your building and your
individual requirements. The system-specific parameters
are protected by a code to prevent unintentional mod-
ifications.
The parameters that serve to adapt the appliance to your
personal requirements are not protected by a code.
2.3 Test symbols
See type plate on the appliance.
3. Appliance description
Heat is recovered from the extract air by means of a highly efficient
cross-countercurrent heat exchanger and an air/water heat pump.
In addition, heat is extracted from the outdoor air. This energy,
efficiently made available by the heat pump, is channelled to the
central heating or DHW system. The cooled air is discharged out-
doors as exhaust air.
When the temperature is very low, or when there is a very high
heat demand, the appliance covers the residual heat demand by
means of an integral electric emergency/booster heater. With a
mono mode design, the electric emergency/booster heater is acti-
vated for emergency heating if the temperature reading falls below
the standard outside temperature, set as the dual mode point.
This ensures heating operation and the provision of high DHW
temperatures. In mono energetic mode, the electric emergency/
booster heater is activated as a booster heater.
The appliance is controlled by a weather-compensated control
unit.
Cooling function
This appliance is suitable for cooling. This is achieved by extracting
heat from the heating system through a reversal of the heat pump
circuit. The heat extracted from the heating water is transferred
by the evaporator to the outdoor air.
The cooling function requires an external programming unit.
The “COOLING” menu will be shown if an external “FES Comfort”
programming unit is connected to the CAN BUS (the control unit
can supply up to two programming units) and recognised by the
control unit.
Heat metering
The appliance is equipped with an integral heat meter. In the “AC-
TUAL VALUES” menu, the supplied amounts of heat are displayed.
Solar backup
A solar thermal system can be connected via a solar heat exchang-
er. Solar backup can be provided both in central heating mode
and DHW mode. A differential temperature controller for the solar
thermal system is integrated in the appliance control unit.
A heat exchanger built into the outdoor air flow heats the outdoor
air for domestic ventilation. If sufficient solar heat is available, the
outside air is preheated indirectly by solar energy.
4. Operation
4.1 Controls
OKMENU
WEDNESDAY 10 SEPT 14 10:23 TIME
OUTSIDE TEMPERATURE
DHW TEMPERATURE
27.0 °C
35.0 °C
28.0 °C
FLOW TEMPERATURE
DAY MODE
D0000064711
The programming unit enables you to change parameters and
to obtain information on the appliance operation. The appliance
can also be controlled when no programming unit is connected
or the connected one is faulty. The programming unit comprises
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