EUROSTER 11WB
–
USER MANUAL
5
1.
Boiler target temperature for CH operation
It is the temperature of the boiler to be maintained by the controller. In case of
operation in the DHW priority mode, the controller can maintain a higher temperature
to heat up the tank.
2.
Hysteresis of the blower operation
This is a temperature range in which the controller linearly adjusts the blower power.
The narrower the temperature range, the smaller the system temperature fluctuations.
However, a too narrow range may result in the temperature oscillation
–
the controller
will alternately heat up and cool down the boiler.
At the time of installation, set the maximum hysteresis value. Wait for the installation
temperature to reach a stable value. If, under such conditions, the blower operates at a
power level between settings No. (3) and (4), the hysteresis may be reduced.
3.
Minimum power of the blower
This is the lowest power at which the blower may operate. It should be set at minimum
value at which the blower rotor starts to rotate. This value should be selected
experimentally using the blower test function (setting No. 16).
4.
Maximum power of the blower
This is the highest power at which the blower may operate. The value should be
selected experimentally so that the boiler temperature maintained by the controller is
as close to the preset temperature as possible.
5.
Blow-through time
This is a period of the blower operation in the blow-through mode. The blower is turned
on in order to remove combustion gases from the boiler. The blow-through time should
be long enough to effectively exhaust the gases via the stack and short enough to
prevent the boiler temperature rise.
6.
Time interval between successive blow-throughs
This is the time passing between the end of the blow-through cycle and the start of a
new cycle. It should be set so that to prevent the boiler temperature rise, but on the
other hand to avoid explosive combustion of the gases generated in the boiler.
7.
DHW tank temperature
This is an average DHW tank temperature to be maintained by the controller.
ATTENTION: Maintaining a low temperature in the tank (at a level of 35-40
°C)
facilitates the development of bacterial flora, including Legionella.
8.
Hysteresis of the DHW tank pump
Difference between the temperature at which the pump is turned off and turned on,
provided that the boiler is hot enough to enable heating of the tank (taking setting
No. 9 into account).
The conditions of turning the pump on and off are specified in section 13.
9.
Boiler and tank differential temperature
This is the value by which the boiler temperature should exceed the tank temperature
(plus the constant parameter of 3
°C) to enable filling of the tank without a risk that it
will chill out. Alternately, in case of increase of the DHW tank temperature or decrease
of
the
boiler
temperature
this
differential
value
(minus the constant parameter of 3
°C) specifies the temperature at which the filling
cycle will be interrupted.
10.
DHW heating priority
Activation of the DHW priority results in faster heat up of the cold DHW tank, by turning
the CH pump off and increasing the boiler preset temperature.
After heating up of the tank to the desired temperature, the controller resumes to
normal operation.
If the DHW priority is turned off, the DHW pump is started when the tank temperature
is low and the boiler temperature is high enough.
11.
CH pump operation temperature
The conditions of turning the pump on and off are specified in section 13.
12.
CH pump hysteresis
This is a differential temperature at which the controller turns the pump on and off.
The conditions of turning the pump on and off are specified in section 13.