EUROSTER 11W
–
USER MANUAL
7
ATTENTION: The controller will not turn the blower on automatically if it was
previously manually turned off by the user.
12.
CONTROLLER OPERATION
The boiler temperature is maintained by adjusting the amount of air blown and by controlling
the CH pump.
In the firing-up mode when the temperature is low and the boiler may sweat, the blower is
operating with its full power (determined by setting No. 4). Thus the firing-up period is as
short as possible.
If the boiler temperature is close to the set temperature, within the hysteresis range, the
controller adjusts the air flow smoothly. The range of the blower power control is limited by
two settings: the minimum blower power (3) and the maximum blower power (4).
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. Display blinking indicates overheating.
The boiler temperature drop below the shutdown temperature setting (setting No. 10) turns
the blower off. The pump operates according to the setting (No. 7).
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
Power Alarm Temperature
In case the temperature measured by the boiler sensor exceeds the alarm temperature
(90
°C), the blow
-throughs are turned off, and additionally the thermal protection feature
interrupts the blower power supply until the temperature drops to 60
°C.
Frost protection
The frost protection function is activated when the temperature of the sensor falls to 4
°C.
If
the boiler sensor (CH) reaches such temperature, the CH pump is activated and "AF" letters
(Anti-Freeze) are displayed.
13.
ANTI-STOP
Each time the controller is turned on, the ANTI-STOP function immediately turns the pump 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.
Any alarm generated while the ANTI-STOP function is active (overheating or sensor damage)
suspends the function operation until the alarm is over.
14.
TROUBLESHOOTING
Device does not work
Burnt fuse or ROM failure
–
send the device to the service.
The display blinks along with the sensor icon, "Sh" or "OP" letters appear
Sensor circuit shorted (
Sh
) or opened (
OP
)
–
check the adequate sensor cable or send the
device along with the sensors to the service.
Pump or blower does not work
Wrong connection
–
make sure that the icons are displayed. If yes, then check the
connections.
Setting error
–
check whether the blower is not turned off manually (section 11), check the
settings. Restore factory settings (section 8).
Thermal protection activation
–
wait for the temperature decrease.