www.stiebel-eltron.com LWZ304-404 SOL | 31
INSTALLATION
Settings
1
26_04_01_0647
After modifying the set interval, press the reset button for the
electronics to start a new cycle immediately. Otherwise the old
cycle will be finished first.
MAX DHW HTG DUR.
Direct line: P36
Using the "MAX DHW HTG DUR." parameter, the maximum du-
ration for DHW heating is specified. If the set DHW temperature
in the cylinder has not been reached after this number of hours,
there is a fault with DHW heating (display: Fault15), and DHW
heating is blocked until 22:00h. After this, DHW heating is restart-
ed. If the set DHW temperature is not reached again, DHW heating
is blocked until 22:00h the following day.
PASTEURISATION TEMP.
As part of every pasteurisation event to protect against the growth
of legionella bacteria, the water in the DHW cylinder is heated up
to the temperature set in the "PASTEURISATION TEMP." parameter.
For effective pasteurisation, you should set this parameter to at
least 55°C. As temperatures above 50°C are not reached with
the heat pump alone, the enabled electric emergency/booster
heater stages always switch on during the heat-up process for
pasteurisation.
PASTEURISATION TIME
In the parameter "PASTEURISATION", you have set how often pas-
teurisation to protect against the growth of legionella bacteria is
to be carried out (every X days). With the parameter "PASTEURI-
SATION TIME" you set the time of day at which that pasteurisation
will be carried out.
DHW BOOSTER STAGE
With the "DHW BOOSTER STAGE" parameter you can enable up to
three stages of the electric emergency/booster heater. The heat
pump can only heat DHW up to a temperature of approx. 50°C.
The electric emergency/booster heater is used for higher set DHW
temperatures.
Note
DHW heating may possibly not complete if the electric
emergency/booster heater has been blocked because
the high limit safety cut-out has tripped or the electric
emergency/booster heater has been switched off via an
external MCB. The entire room heating system is then
blocked for the time set under "MAX DHW HTG DUR.".
When outside temperatures are low, DHW heating cannot
be accelerated due to "BOOSTER TIMEOUT" and "BOOST-
ER T ACTIVATE", leaving the room heating system blocked
for prolonged times in this situation too. It is not possible
to enable less than one stage of the electric emergency/
booster heater.
DHW BUFFER MODE
Direct line: P84
If you enable "DHW BUFFER MODE", the DHW cylinder will be
used as a buffer cylinder for excess output. Use this parameter
exclusively for convector heaters.
MAX FLOW TEMP DHW
Using the "MAX FLOW TEMP DHW" parameter, you can limit the
flow temperature in DHW mode. If this value is set too low, it may
not be possible for DHW heating to be completed. This can lead
to a fault message (F15).
DHW ECO
Direct line: P89
If the parameter "DHW ECO" is set to "ON", DHW is normally heated
only by the heat pump. The electric emergency/booster heater only
backs up DHW heating in the case of very low outside tempera-
tures or if DHW heating takes unusually long.
In "DHW ECO" mode, DHW is initially heated according to the set
cylinder temperature. If the application limits of the heat pump
are reached before the required temperature, DHW heating is
terminated and the cylinder temperature that has been reached
is accepted as the new set DHW temperature in the parameter set
("DHW SET DAY", "DHW SET NIGHT", "DHW SET STANDBY"). The
system "learns" the maximum set DHW temperature that can be
reached with the compressor only.
If "DHW ECO" has the value "OFF", the electric emergency/booster
heater starts if the heat pump reaches its application limit.
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