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| LWZ 304-404 SOL
www.stiebel-eltron.com
INSTALLATION
Settings
COOLING
The "COOLING" menu will only be shown if the appliance recognis-
es an external programming unit connected to the BUS.
!
Material losses
In the "AREA HEATING SYSTEM" mode, dew point mon-
itoring is active. There is a high risk of severe building
damage if cooling is provided by means of an area heat-
ing system in "Fan convectors" operating mode.
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Set the following parameters for the heating circuits:
Cooling mode HC1
COOLING MODE HC1
OFF | ON
COOLING SYSTEM HC1
AREA COOLING | FAN COOLING
HC TEMP. COOLING HC1
HYST. ROOM TEMP. HC1
To allow the appliance to cool, you must set the "COOLING MODE"
parameter to the value "ON".
Cooling is enabled when the appliance is in summer mode and the
outside temperature exceeds the set room temperature for heat-
ing (parameter "ROOM TEMPERATURE DAY" in menu "HEATING /
ROOM TEMPERATURES HC1" or "ROOM TEMPERATURES HC2") for
2 hours by 3 K.
If the room temperature is then higher than the set room temper-
ature for cooling by the amount set in the "HYST. ROOM TEMP."
parameter, cooling will be prepared. The display shows a snow-
flake. The circulation pump starts, the three-way valve changes
over to the heating circuit and the "cooling" output is activated in
order to, for example, open the thermostatic valves in the rooms
to be cooled.
COOLING MODE HC2
See chapter "Cooling mode HC1".
STANDARD SETTING
HYST. FLOW TEMP.
The compressor starts if the flow temperature lies higher than
the set flow temperature for cooling by the amount of the "HYST.
FLOW TEMP.". The compressor stops when it is lower than this by
the amount of flow temperature hysteresis. The dew point is mon-
itored in area heating systems. The dew point is that temperature
at which humidity in the air begins to condensate. The compressor
is blocked (snowflake flashes) once the flow temperature is within
2 K of the dew point. The compressor will be enabled if it lies above
this value by the hysteresis set in parameter "HYST. FLOW TEMP.".
SOLAR POWER
Option
SOLAR HYSTERESIS
COLLECTOR TEMP LIMIT
COLL. PROTECT TEMP
COLL. CUT-OFF TEMP
COLLECTOR PROTECTION
OFF | ON
PRIORITY SOLAR
SOLAR | COOLING | COOLING TIME
COOLING TIME
COOLING TIME START
COOLING TIME END
SOLAR HYSTERESIS
"SOLAR HYSTERESIS" in combination with "TEMP. DIFFERENTIAL"
serves as a threshold for starting and stopping the solar circuit
pump. Most systems work well with a hysteresis value of 1 K. For
system with very long line lengths, a higher value can be entered
here.
"Solar overheating" function???
If there is no heat demand and, at the same time, the cylinder
temperature is lower than the temperature set in the "DHW SOLAR
TEMP." (P83) parameter, the appliance checks whether the collec-
tor temperature is higher than the cylinder temperature by the
sum of the differential temperature (P81) and hysteresis. If so, the
DHW pump and the solar circuit pump are started.
COLLECTOR TEMP LIMIT
To protect the heating circuit, the solar circuit pump modulates its
operation when the collector temperature exceeds the value set
under parameter "COLLECTOR TEMP LIMIT".
COLL. PROTECT TEMP
If the adjustable "COLL. PROTECT TEMP" has been reached and
"COLLECTOR PROTECTION" enabled with the value "ON", the DHW
cylinder is heated to the temperature set under "DHW SOLAR
TEMP.". The selected "MAX. FLOW TEMP DHW" terminates the pro-
cess. If, after maximum cylinder heating, the collector temperature
exceeds the set value, the solar circuit pump is stopped and blocked
until the cylinder temperature meets the following condition:
"DHW TEMPERATURE" ≤ "DHW SOLAR TEMP." — 5 K hysteresis.
WARNING BURNS
Temperatures in excess of 60 °C can be reached. There
is a risk of scalding at outlet temperatures in excess of
43 °C.
COLL. CUT-OFF TEMP
The collector is blocked for heat transfer if the collector temper-
ature rises above the set "COLL. CUT-OFF TEMP". It is not enabled
again until it falls back below the collector protection temperature.
The collector protection temperature must be lower than the col-
lector cut-off temperature.
