DHW demand
71
Neither thermostat threshold has hysteresis, but rather a common switch-on/off difference to
the adjustable threshold value.
Example
:
T.DHW SET = 50°C
DIFF. ON
= 1.0 K
DIFF.OFF
= 8.0 K
In other words, if the temperature falls below T.DHW 51°C (= 50°C + 1°K), the output is acti-
vated, while it is switched off if the temperature exceeds 58°C (= 50°C + 8°K).
The function block provides the burner output as an output variable. It can be assigned to a
speed output or to the analogue output. For instance, the burner performance can be con-
trolled (assuming you have the appropriate burner technology) via hardware output 15 or 16
(analogue output 0 - 10V). This is recommended when the burner's performance compared to
the heat exchanger's performance sets off the excess temperature protection in the boiler.
It is also possible to charge the cylinder outside the programmed time window to the set tem-
perature once by pressing the key.
Entire menu view:
DES: WW-REQ
FUNCTION STATUS:
INPUT VARIABLE:
OUTPUT VARIABLE:
SINGLE CHARGING:
Charge the cylinder outside of the main time by pressing the key
START
DHW TEMP.:
T.DHW ACT: 54.3°C
Current temperature of the DHW cylinder
T.DHW SET: 50 °C
Set temperature of the DHW cylinder
TIME
PRG.:
Opens the time menu (see
Time programs
)
T.DHW MIN: 40 °C
Minimum temperature of the DHW cylinder
DIFF.ON: 0.0 K
Switch-on difference to T.DHW SET and T.DHW MIN
DIFF.OFF: 4.0 K
Switch-off difference to T.DHW SET and T.DHW MIN
Burner outp.: 100 %
Specification for burner performance
Code for Technicians:
In order to enable all of the setting parameters, open the function "User" in the device’s basic menu
and then select "Technician". Enter the product of 2
6
as the code!
