STIEBEL ELTRON WPM - Page 21

COMMISSIONING
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www.stiebel-eltron.com WPM | 21
Menu: SETTINGS
60
40
20
0
1
2
20 15 10 5 0 -5 -10 -15 -20
26_03_01_1915
X Outside temperature [°C]
Y Return / flow temperature [°C]
1 Comfort mode
2 ECO mode
Adapting a heating curve
Example: During spring and autumn, at outside temperatures of
between +5 °C and +15°C, the room temperature is too low even
with the radiator valves fully open. At an outside temperature
of approx. 0°C, the set room temperature will be achieved. The
heating curve is set to 1.0, relating to a room temperature of 20°C.
With a parallel shift of the heating curve accompanied by a re-
duction of the curve, the heating performance of the system is
corrected.
The dotted line shows the heating curve reduced to 0.83 and the
set room temperature of 23.2°C, increased by 3.2°C.
60
40
20
0
20 15 10 5 0 -5 -10 -15 -20
26_03_01_1916+
X Outside temperature [°C]
Y Return / flow temperature [°C]
 STANDARD SETTING
 BUFFER OPERATION
This parameter is used to determine the basic system configura-
tion and thus the overall behaviour of the system.
If a buffer cylinder is used:
 Set the parameter to ON. Confirm the selection with OK. The
buffer charging pump is also actuated with the compressor.
After a delay, the compressor is started.
If no buffer cylinder is used:
 Connect the heating circuit pump to the X2.6connection.
 Set the parameter to OFF. Confirm the selection with OK. The
heating circuit pump runs continuously.
Note
An incorrect setting can lead to malfunctions.
 SUMMER MODE
With this parameter, automatic shutdown of heating mode can be
activated in summer.
With a building insulation value of 0 (see parameter BUILDING
HEAT BUFFER): If the current outside temperature exceeds the set
outside temperature (see parameter OUTSIDE TEMPERATURE), the
system switches to summer mode. If the current outside tempera-
ture falls below the set outside temperature, the system switches
to heating mode.
With a building insulation value of 1-3 (see parameter BUILDING
HEAT BUFFER): If the outside temperature averaged over a spec-
ified period exceeds the set outside temperature (see parameter
OUTSIDE TEMPERATURE), the system switches to summer mode.
If the outside temperature averaged over a specified period falls
below the set outside temperature, the system switches to heating
mode.
When the parameter FIXED VALUE OPERATION is enabled, summer
mode is deactivated for heating circuit1. Heating circuits 2-5 are
not affected by this.
 OUTSIDE TEMPERATURE
 Using the Touch-Wheel, set the temperature at which the
system should switch on or off.
 BUILDING HEAT BUFFER
Select BUILDING HEAT BUFFER to specify the type of building with
regard to insulation and heat loss. Changeover to and from sum-
mer mode is quicker or slower depending on the building type.
- Setting "0" = uninsulated
The outside temperature is compared directly with the set
temperature trigger point.
- Setting "1" = light insulation
Outside temperature is captured over a 24hour period. An
average is calculated from the data.
Typically: Wood construction with rapid heat transfer and lit-
tle or no thermal insulation.
- Setting "2" = medium insulation
Outside temperature is captured over a 48hour period. An
average is calculated from the data.
Typically: Brick construction with thermal insulation and av-
erage heat transfer.
- Setting "3" = heavy insulation
The outside temperature is captured over a 72hour period.
An average is calculated from the data.
Typically: Building with very slow heat transfer, e.g.very
thick brick walls.
If the calculated outside temperature ≥ the set outside temper-
ature, all heating circuits will switch to summer mode. Summer
mode relates solely to the central heating function.
With fixed value control, summer mode is disabled for heating cir-
cuit 1. Summer mode remains active for all other heating circuits.
Changing the set temperature on remote controls will have no
effect. The system will continue to run in summer mode.
 FLOW PROP HEATING CIRC
Select FLOW PROP HEATING CIRC to specify the temperature meas-
urements on which the control characteristics of the system are
based.
Control characteristics can be based on the return temperature,
the flow temperature or on a specified combination of the two