www.stiebel-eltron.com LWZ304-404 SOL | 37
INSTALLATION
Settings
Parameter Comments
MIXER OPEN
MIXER CLOSED
DIVERTER VALVE
COMPRESSOR
BOOSTER STAGE 1
BOOSTER STAGE 2
BOOSTER STAGE 3
EXTRACTOR SPEED Activating this parameter sets the speed to
100%.
VENTILATOR SPEED Activating this parameter sets the speed to
100%.
NIGHT VENTILATION
WINDOW OPEN
CONTACT COOLING
EVAPORATOR
DEFROST END TEMP.
The evaporator stops defrosting if this temperature is reached
during the defrosting process. Never change this value.
MAX DEFROST DUR.”
Evaporator defrost is terminated after the time set here has ex-
pired, and the appliance returns to its original operating state. If
the evaporator has not yet been defrosted, the defrosting process
is re-initiated. This process is repeated until the upper evaporator
temperature limit is reached or exceeded. If defrost is terminated
through the maximum defrost time 10 times in a row, a fault (F17)
is displayed.
BOOSTER REFR. GUARD
If, during the defrosting process, the condenser temperature falls
below the limit value defined under "BOOSTER REFR. GUARD",
the electric emergency/booster heater is switched on to stop the
heating water cooling down any further.
DEFROST STOP
If the condenser temperature still continues to drop after the elec-
tric booster heater has been switched on, there is a risk that the
condenser may freeze up. In this case, the defrosting process will
be terminated when the temperature defined under the "DEFROST
STOP" parameter is reached.
REFRIGERATION UNIT
COMPRESSOR CYCLING
Direct line: P47
Here, you define the delay before the compressor switches back
on. To limit the compressor to three start cycles per hour, a value of
20minutes is preset. This time counts from when the compressor
starts. For example, the compressor can run for 15minutes, and
start again after 5minutes downtime.
EXPELLED AIR SPEED
Direct line: P48
This parameter enables you to set the speed of the exhaust air fans
as a percentage of the maximum speed. The exhaust air fan should
always be set to 70% to ensure efficient heat pump operation.
PUMPS
PUMP SPEED DHW
This parameter enables you to set the speed of the internal circu-
lation pump during DHW heating.
PUMP SPEED HEATING
This parameter enables you to set the speed of the internal circu-
lation pump during room heating.
MIXER P. RUN-ON
This parameter enables you to set the pump run-on for the mixer
pump after the internal circulation pump is switched off. This
assists in draining any buffer cylinder that may be present.
PUMP CYCLES
MINIMUM CYCLES P54
MAXIMUM CYCLES P55
OUTSIDE TEMP MIN CYC P57
OUTSIDE TEMP MAX CYC P56
Determine here how many times each day the heating circuit pump
starts. Under "OUTSIDE TEMP MIN CYC", you define the outside
temperature above which the pump starts as often as is set under
"MINIMUM CYCLES". Accordingly, "OUTSIDE TEMP MAX CYC" de-
termines the temperature below which the pump starts as often
as set under "MAXIMUM CYCLES".
Example: In factory settings, if the outside temperature is above
20°C ("OUTSIDE TEMP MIN CYC") the pump runs once a day ("MIN-
IMUM CYCLES"); below 19°C ("OUTSIDE TEMP MAX CYC") 288 times
a day for five minutes at a time (288*5/60=24 hours). This means
that below 19°C, the pump is constantly on; above 20°C, the pump
starts once a day so it does not seize up during the summer. The
appliance interpolates between the temperatures "OUTSIDE TEMP
MIN CYC" and "OUTSIDE TEMP MAX CYC". At 19.5°C the circulation
pump starts 144 times each day.
With the aid of "Pump cycles", you can set the pump not to start
during the compressor blocking time (20min) in winter. For this
purpose, set "MAXIMUM CYCLES" (P55) to 50 and "OUTSIDE TEMP
MAX CYC" (P56) to 0°C. Below 0°C, the pump therefore starts no
more than 50 times a day. This prevents the electric emergency/
booster heater being started while the compressor is blocked,
although the compressor output should still be sufficient.
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