www.stiebel-eltron.com LWZ304-404 SOL | 29
INSTALLATION
Settings
DIAGNOSIS
See operating instructions.
PROGRAMS
STANDARD SETTING
MAX. ADVANCE
With the "MAX. ADVANCE" parameter you determine for what
period, prior to starting day mode, the appliance switches back
to standard operation. This achieves the required set value being
reached again at the end of setback mode. This means, for exam-
ple, that following a return from holiday a building is warm, well
ventilated and that the DHW inside the cylinder is at the required
temperature. In heating mode, for half of the time selected here
the electric emergency/booster heater will be blocked, so that the
heat pump alone heats the building, subject to the output being
sufficient.
SETTINGS
HEATING
STANDARD SETTING
INTEGRAL COMPONENT
Direct line: P30
The control deviation, i.e. the differential between the set heating
circuit temperature and the actual heating circuit temperature is
totalled over time. Every time the adjustable switching value set
under "Integral component" is reached, one output stage higher
or lower is switched.
Effect:
- Low value, quick reaction. This means the appliance tends
towards cycling between output stages.
- High value, slow reaction. This stabilises the individual out-
put stages.
Example: At a control deviation of 5K, it takes 10minutes to reach
the switching value of 50Kmin. The stage then switches and the
Kelvin/minute value is reset to zero.
MAX BOOSTER STG HTG
Direct line: P31
Up to three electric booster stages can be enabled. Since the heat
pump has only a low heating output at extremely low outside
temperatures, all three stages of the electric emergency/booster
heater should usually be enabled. The control unit ensures that
as much heat as possible is generated by the heat pump, and the
electric emergency/booster heater only starts when the heating
output of the heat pump is no longer adequate.
MAX FLOW TEMP HTG.
Under "MAXFLOWTEMPHTG.", the maximum flow temperature
can be set according to local conditions, for example to protect
an underfloor heating system from excessive temperatures.
If this temperature is exceeded, the compressor and electric
emergency/booster heater are switched off.
This is a limiter function. Compressor and electric emergency/
booster heater restart when the maximum flow temperature is
undershot again.
SUMMER MODE
Direct line: P49
At the value set here for the outside temperature, there is a
changeover between summer and winter mode. In summer mode,
the heating is switched off.
Note
In summer mode, the "OUTSIDE TEMP MIN CYC" param-
eter will not be taken into account. The heating circuit
pump runs as often as is set in the "MINIMUM CYCLES"
parameter.
HYST. SUMMER MODE
Direct line: P50
Here, the switching hysteresis for the changeover from summer
to winter mode is determined. If "SUMMER MODE" is exceeded by
the value of the parameter "HYST. SUMMER MODE", the system is
switched to summer mode. If "SUMMER MODE" is undershot by
the value of the parameter "HYST. SUMMER MODE", the system is
switched to winter mode.
OUTSIDE T ADJUSTMENT
Direct line: P77
The outside temperature is adjusted to prevent an offsetting of
the heating curve when there are rapid changes in the outside
temperature resulting in a constant cycling of the heat pump. An
average value is calculated over the selected time. The adjustment
can be varied from 0 to 24 hours under this parameter.
DUAL MODE POINT
Direct line: P78
The electric emergency/booster heater for heating mode is ena-
bled if the outside temperature drops below the dual mode point.
The electric emergency/booster heater is blocked if the outside
temperature lies above the dual mode point. You can define this
temperature threshold with the "DUAL-MODE POINT" parameter.
Note
If the heating output of the heat pump is inadequate at
low outside temperatures, adjust the dual mode point to
a higher temperature.
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