EUROSTER 11WB
–
USER MANUAL
8
Exceeding the boiler temperature results in turning into the blow-through operation. In this
operation mode the blower is started only to remove combustion gases out of the furnace.
Blow-through cycle parameters should be set so that the boiler temperature drops to the level
at which the blower operates with a linear rotational speed adjustment.
If the boiler temperature exceeds the alarm temperature, the blower is turned off permanently.
Overheating is indicated by display blinking.
The boiler temperature drop below the shutdown temperature setting (setting No. 15) turns
the blower off. The pumps operate according to the settings.
13.
PUMPS CONTROL
The controller monitors the temperature in the tank and in the boiler on an ongoing basis.
The CH pump is turned on if the boiler temperature exceeds the preset value by a half of the
set hysteresis T
boiler
≥
T
CH
+ H
CH
/2
The CH pump is turned off if the boiler temperature drops below the preset value by a half of
the preset hysteresis T
boiler
≤
T
CH
- H
CH
/2
Decision to turn the DHW pump on is made in two steps:
⚫
The tank should be heat up if the tank temperature is lower than the preset value by at
least a half of the preset hysteresis, T
tank
≤
T
DHW
- H
DHW
/2. In this case, if the DHW
heating priority is active, then the operation of the CH pump is stopped.
Heating up of the tank can be stopped if the tank temperature is higher than the preset
value by at least a half of the preset hysteresis, T
tank
≥
T
DHW
+ H
DHW
/2.
⚫
The pump can be turned on without a risk of cooling the tank down, provided that the
temperature of the heat source exceeds the tank temperature by at least the value of
the preset
Difference (9)
plus 3
°C, T
boiler
- T
tank
≥
T
difference
+ 3.
The pump cannot be turned on without a risk of cooling the tank down, provided that
the temperature of the heat source does not exceed the tank temperature by at least
the value of the preset
Difference (9)
minus 3
°C, T
boiler
- T
tank
≤
T
difference
–
3.
Frost protection
The frost protection function is activated when the temperature of a given sensor
falls to 4
°C.
If the boiler sensor (CH) reaches such temperature, the CH and DHW
pumps are activated and "AF" letters (Anti-Freeze) are displayed. For the (DHW)
tank sensor only the DHW pump is started. The protection is turned off when the
temperature rises to 6
°C.
14.
POWER ALARM TEMPERATURE
In case the temperature measured by the boiler sensor exceeds the alarm temperature
(90
°C), the CH and DHW pumps are turned on irrespective of the priority, the blow
-throughs
are turned off, and additionally the thermal protection feature interrupts the blower power
supply until the temperature drops to 60
°C.
15.
SUMMER SEASON OPERATION
In order to disable the CH system operation for the summer season, set the temperature of
the CH pump operation (11) higher than the settings of the DHW tank and of the boiler, e.g. to
80
°C. This will enabl
e the DHW tank to heat up quickly and the boiler will be protected against
high temperature.
16.
ANTI-STOP
Each time the controller is turned on, the ANTI-STOP function immediately turns the pumps on
for 30 seconds (also after restoring factory defaults or change of the backlight type); later the
operation is repeated every 14 days. "AS" letters are blinking on the display while the function
is active.