CONTROLLER OPERATION
1.
Switch in the “AUTOMATIC” setting
The controller switches the blower on or off depending on the temperature of the sensor.
Use the rotary knob to set the temperature above which the continuous operation of the blower is
automatically switched off.
If the temperature is higher than the set value, the blower switches on for 0
÷18 seconds every 6
minutes (periodic boiler blow-through). The time setting can be adjusted using a small screwdriver (one
full rotation corresponds to ca. 1 second) through the opening on the left-hand side of the housing next
to the fuse base (factory setting: 6 seconds).
Note: Blow-through should not be deactivated for safety reasons.
After the CH boiler is extinguished and the temperature drops below 30
°C, the continuous operation of
the blower is switched off, and periodic boiler blow-through is deactivated.
If the red indicator is lit, it denotes blower operation.
On
Off
Setting
in scale
Periodic
blow-through
Temp.
30°C
2.
Switch in the “FIRE UP” setting
If the CH boiler is cold (temperature below
30
°C), the blower is switched on to enable the firing of the
boiler.
If the temperature rises above the setting in the scale, the continuous operation of the blower is
switched off
(as in the “AUTOMATIC” mode), and periodic boiler blow-through is performed.
On
Setting
in scale
Periodic
blow-through
Temp.
30°C
3. If (after boiler firing) the temperature exceeds
30
°C, put the switch to the “AUTOMATIC” setting
so that the blower is switched off after the boiler is extinguished.
4. The controller is equipped with an electronic thermometer with a digital display for indicating the
temperature on the boiler (range: 20-99
°C).
SAFETY DEVICES
The controller and the blower motor are protected by means of a 500 mA fuse which blows up in emergency
situations (e.g. short-circuit in the motor or in the controller).
An additional protective device is a thermal cut-out which switches off the blower independently of the
controller when the temperature of the boiler exceeds 90
°C (the thermal cut-out is switched on again when
the temperature drops by ca. 30
°C), e.g. in the event of pump or controller failure.
