EUROSTER 12M
–
USER MANUAL
7
Exceeding the feeding alarm temperature activates the alarm algorithm
to attempt to cool down the boiler. The heating zone is heated up to the alarm
temperature of the zone.
•
Correction of sensors
Correction of temperature sensors allows to correct temperature reading errors,
such as the ones resulting from improper contact between the sensor and the
pipe.
9. CONTROLLER OPERATION
The temperature of the heating zone is adjusted with the PI algorithm (proportional-
integral algorithm), which enables obtaining fast and accurate control for different loads.
The controller controls the temperatures of the boiler and the controlled zone.
Periodically, it calculates the difference between the preset and measured temperature.
If the difference exceeds half of the hysteresis value, then the mixer position is corrected
with the speed determined by "Dynamics" parameter. If the mixer was switched on to
operate at the same direction by at least 100 s, the controller switches the valve actuator
permanently to set it in the limit position.
The CH pump is switched on if the temperature of the feeding sensor exceeds the value
of the "Shutdown temperature" parameter by 2°C, and it is switched off if the
temperature of the feeding sensor drops below the shutdown temperature.
The heating zone is switched off if:
•
The heating season (WINTER) is switched on.
•
The current time is selected in the schedule.
•
The room thermostat is active or operation with room thermostat is switched off.
•
Automatic operation is switched off or the mean outdoor temperature is lower
than the switch-off temperature in the case of switched on automatic operation.
•
The feeding temperature is higher than required or the feeding temperature
sensor is switched off.
CAUTION!
The temperature preset for a heating zone is not displayed if:
•
The feeding sensor temperature is lower than the shutdown temperature.
•
The room thermostat reached the preset temperature and switched off the zone
(pump operation switched off).
•
There is a stoppage set up in an operation schedule.
•
The zone was switched off automatically (it is warm outside).
10. ANTI-STOP SYSTEM
Anti-Stop system activates the pump and the mixing valve directly upon each switch-on
of the controller (also upon restoring factory settings), and later
—
every 10 days. During
its operation, "AT" letters flash at the display.
If an alarm situation (overheating or sensor damage) occurs when the Anti-Stop system
is active, the operation of the Anti-Stop system will be ceased.
11. ALARM SITUATIONS
To ensure safe and reliable operation, the controller features a number of protections.
The list of alarm events is shown in the table below. In case an alarm situation occurs,
audible alarm is generated, and a relevant message is displayed. Upon resolution
of the alarm situation, the controller automatically resumes operation.
Alarm
Message
Controller response
Feeding sensor
shorted
ALARM: FEEDING
shortage
Activation of an audible alarm. CH
temperature operated up to the preset
temperature.
Breach of the feeding ALARM: FEEDING
Activation of an audible alarm. CH
temperature operated up to the preset
