STIEBEL ELTRON WPM 3

OPERATION
Menu structure
22 | WPM 3 www.stiebel-eltron.com
EXTERNAL HEAT SOURCE
THREADED IMMERSION HEATER
HS 2 is directly connected to the heating circuit. This can take
the form of an immersion heater inside the buffer cylinder or a
modulating boiler connected to the heating flow. The HS2 sensor
must be connected to the heating flow of HS2. Subject to load,
HS2 starts below the dual mode temperature (parameter DUAL
MODE TEMP HZG) as the last stage in the cascade. HS2 regulates
the temperature according to the calculated return temperature +
heating curve gap (parameter HEATING CURVE GAP). Heat source
2 does not switch off until this temperature is reached. This means
that even if the heat pump is already off and the set temperature
for HS2 has not yet been reached, it can still operate alone. The
start conditions for HS2 are:
– The actual temperature is below the dual mode temperature
– The heat pump operates with all stages
– Actual HS2 temperature is < set return temperature
BOILER
No fixed value control is possible with this setting. With this set-
ting, heating circuit 2 (mixer circuit) cannot be switched. The mixer
is connected for HS2. Connect the HS2 sensor to the boiler and
the mixer sensor to the heating flow. Subject to load, HS2 starts
below the dual mode temperature (parameter DUAL MODE TEMP
HZG) as the last stage in the cascade.
The mixer is closed in heat pump mode. After HS2 starts, the
mixer regulates the temperature according to the set mixer tem-
perature if the temperature at HS2 is > the calculated set mixer
temperature, and the actual mixer temperature is <1K of the set
mixer temperature. HS2 shuts down when it reaches the maxi-
mum set boiler temperature (parameter SET BOILER TEMPERA-
TURE). It can operate alone if the heat pump is already off and the
set temperature for the HS2 has not yet been reached. The start
conditions for HS2 are:
- The temperature falls below the dual mode temperature.
- The heat pump operates with all stages.
- The actual temperature must be 5 K below the set boiler
temperature.
HEATING CURVE GAP
See under parameter EXTERNAL HEAT SOURCE; setting THREADED
IMMERSION HEATER and setting BOILER.
SET BOILER TEMPERATURE
See under parameter EXTERNAL HEAT SOURCE; setting BOILER
BLOCKING TIME EVU
Blocking time from power supply utility.
As the heat pump is unable to meet any heating requirements
during the power-OFF period, determine how HS2 will operate
during this time. If set to OFF, HS2 will always take over the heat-
ing function during power-OFF periods (even above the dual mode
temperature). If you want HS2 to be disabled for heating during
the power-OFF period, enter the corresponding time in hours.
LOWER APP LIMIT HZG
Heat pump application limit
If the outside temperature drops below the selected lower appli-
cation limit for heating, the heat pump is switched off.
Only the second external heat source provides heating.
DUAL MODE TEMP HZG
Dual mode temperature of the heat pump for heating mode
Below this outside temperature, the second external heat source
switches on for heating mode, subject to load.
HZG PWM
The I component of HS2 can be defined here in Kmin. Adjustable
from 10 to 100 Kmin.
ELECTRIC REHEATING
LOWER APP LIMIT HZG
Heat pump application limit
If the outside temperature drops below the selected lower appli-
cation limit for heating, the heat pump is switched off.
The electric emergency/booster heater alone provides heating.
DUAL MODE TEMP HZG
Dual mode temperature of the heat pump for heating mode
Below this outside temperature, the electric emergency/booster
heater is switched on for heating mode, subject to load.
NUMBER OF STAGES
Maximum number of DHC heating stages enabled by the controller
for the heating circuit.
Subject to the required heating output, between 0 and 3 DHC
heating stages may be enabled.
DELAY
Start delay of the DHC heating stage demanded by the controller.
When the dual mode point is not achieved, the required DHC
heating stage is delayed by the time (in minutes) selected. This
reduces the comfort a little but the system operates with greater
energy efficiency.
5.4.3 DHW
DHW TEMPERATURES
COMFORT TEMPERATURE and ECO TEMPERATURE
Here you can select the set DHW temperatures for comfort and
ECO mode.