STIEBEL ELTRON LWZ 404 SOL - Dhw; X85; &#X84

OPERATION
Operation
12 | LWZ304-404 SOL www.stiebel-eltron.com
 FLOW PROPORTION
Flow means the pipework that supplies hot water to the heating
system. The return carries the cooled water from the heating sys-
tem to the heating system. With the “FLOW PROPORTION” param-
eter you determine whether your heating system should function
as a flow or return temperature-controlled system.
Setting Control unit Flow [%] Return [%]
0 Return temperature control 0 100
30 30 70
50 50 50
80 80 20
100 Flow temperature control 100 0
To limit the influence of the flow temperature, you should gener-
ally set values below 50 for heating circuit 1 (we recommend 30).
Particularly in spring and autumn, the flow temperature is subject
to naturally strong fluctuations because of the heat pump being
switched on and off. If these strong fluctuations make it necessary,
the booster stages would also be started, although the heat pump
alone would be capable of covering the current heat demand.
No flow proportion is scanned for heating circuit2. Always enter
100 here, as the mixer circuit does not have its own return sensor.
 MIN. SET VALUE/ MAX. SET VALUE
With these parameters, you set the minimum and maximum set
temperatures for the heating circuit. These values limit the heat-
ing curve in the upper and lower regions. Even if the calculated
heating curve would go beyond these limits, it is limited to these
set values.
 HEATING CURVE
Under this parameter, you can display the heating curves for both
heating circuits.
60
40
50
30
20
10
00
-25 -20 -15 -10 -05 00 05 10 15 20 25
26�04�01�0348
MAIN MENU
HEATINGHEATING CURVE HC1
HEATING CURVE
THK °C
TA
°C
Note that parameter “Flow proportion” has an influence on heat-
ing curve “HC1”. This means the heating curve is distinctly lower
than the flow temperature curve. (see examples 1 and 2).
The heating curve for “HC2” is a flow temperature curve.
Example 1
Heating curve 55/40 , Radiator heating system
Set room temperature °C 20
Low end °C 5
Gradient 0.65
Flow proportion % 30
Design temperature °C -15
0
10
20
30
40
50
60
-15 -10 -5 0 5 10 15 20
1
3
2
26�04�01�0379
X Outside temperature [°C]
Y Heating temperature [°C]
1 Flow
2 Heating curve
3 Return
Example 2
Heating curve 35/28 , Underfloor heating system
Set room temperature °C 20
Low end °C 1
Gradient

0.3
Flow proportion % 30
Design temperature °C -15
0
5
10
15
20
25
30
35
40
-15 -10 -5 0 5 10 15 20
1
3
2
26�04�01�0380
X Outside temperature [°C]
Y Heating temperature [°C]
1 Flow
2 Heating curve
3 Return
If you have set the heating curve successfully, set the thermostatic
valves to the required temperature.
Note
Never reduce the temperature in the entire building by
closing all thermostatic valves. Instead, use the night
programs or select the set room temperature with the
“HOTTER/ COLDER” parameter.
4.5.1 STANDARD SETTING
These parameters are reserved for qualified contractors and are
described in the installation instructions.
 DHW
 DHW TEMPERATURES
 DHW SET DAY P04
 DHW SET NIGHT P05
 DHW SET STANDBY P06
 DHW SET MANUAL P11
 DHW TEMPERATURE