ST-85 – USER'S MANUAL
III. Protections
In order to ensure a safe and faultless operation, the regulator has been
provided with numerous protections. In the case of an alarm, an acoustic
warning is sounded and the display shows a corresponding message.
Press the encoder to restore the controller to operation. In the case of the
C.H. Temperature Too High alarm, wait until the temperature drops below
the alarm value.
III.a) Thermal protection
The boiler is protected with an additional bimetal sensor (located at the
boiler temperature sensor) that disables the fan when the temperature
exceeds the critical value: 85
O
C. This is to prevent water from boiling in the
system when the boiler has been overheated or the controller is damaged.
When the protective function is enabled and the temperature drops to a safe
value, the sensor will automatically restart the device and the alarm will be
deactivated. If the sensor is damaged or overheated, the burner, fan and
feeder are disabled.
III.b) Automatic Sensor Check
When the temperature sensor of the central heating or hot consumption
water is damaged, an alarm is sounded with an additional indication shown in
the display, e.g.: „C.H. Sensor Damaged".
Blow is disabled and both pumps are activated simultaneously, regardless of
the temperature.
If the central heating sensor is damaged, the alarm will remain active until
the sensor is replaced. If the hot consumption water sensor is damaged,
pressMENU to deactivate the alarm and restore the single (house heating)
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Alarm
C.H. Sensor Damaged
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