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THERM 90 KD.A
2.4 Selected protective functions of the boiler
Anti-blocking functions
After 24 hours of inactivity, the pump runs for 30 seconds to prevent any blocking. After 24 hours of inactivity. the three-way
valve relay is activated for 10 seconds (if the boiler is fitted with it) due to the same reason. In the case of a request for heating
(heating or hot water) during the execution of this function, the anti-blocking function is automatically terminated and the
request runs. The anti-blocking function is also active when blocking the activity of the boiler in the position of the driver in
the mode “OFF“ (if the boiler is still connected to the electricity network).
Anti-freeze protection
The boiler is fitted with an anti-freeze protection system which protects the boiler (not the heating system, storage tank and
hot water distribution lines) against freezing. Anti-freeze protection is activated in the case of a decrease of the temperature
in the boiler under 6 °C. The pump is activated, the boiler is ignited and heats the heating circuit with a minimum output
of 30 °C. The burning is stopped at this temperature and the pump continues running during the function for running the
pump. If the boiler is in the status for blocking burning (failure), only the pump is activated. The anti-freeze function is also
active with the selector in the position of the control knob in the position “OFF“ or in “SUMMER REGIME“.
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The anti-cycling time within the range 010 minutes can be only be changed by an authorized service technician!
Run-out of the ventilator
The run out of the pump is set in production for 5 minutes. After the extinction of the burner caused by the disconnection of
the room thermostat, the pump continues to operate during the adjusted run out of the pump. In the case that in the winter
regime the boiler is operated without the room thermostat, the pump continues to be ON.
The change of the run out of the pump during the operation with the room thermostat within the range 0 - 10
minutes may only be performed by an authorized service technician.
Notification: All the above-mentioned security and registered functions are in activity only if the boiler is
connected to the electricity!
With respect to the request for increased checking of the microprocessor once every 24 hours of operation,
the forced reset of electronic system is performed with the consequent initialization (it is reflected by short-
term interruption of the boiler and deactivation of data on the display similarly as during the activation of the
network inlet of the boiler into the socket).
Anti-Cyclic
The function that prevents the cycling of the boiler in the heating regime when in the case of operating disconnection of
the boiler, re-ignition of the boiler is not permitted before expiration of the adjusted, anti-cycling time (5 minutes are set in
the production). This function is mostly used in such heating systems where the maximum thermal loss of the stated object
corresponds to the lowest limit of the power range of the boiler.
Checking the flow (checking the operation of the pump)
Before each ignition of the boiler there is a check of the flow switch, which evaluates the correct function of the boiler pump.
Rechecking the flow switch is activated if within 15 seconds of running the pump, the flow sensors is not activated. The
pump is stopped and after 15 seconds there is the next attempt to activate the boiler. This phenomenon is repeated 4x with
consequent signalling of the failure E12. It is necessary to de-block the failure by the regime switch. If the time of inactivity
of the pump before rerunning the boiler exceeds 30 minutes, the first interval for running the pump is prolonged to 180
seconds. For restoration of the activity of the boiler it is necessary to disconnect and connect using the rotary control knob
for selection of regimes or by disconnecting and connecting the network supply.
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Run-out of the ventilator
After termination of burning, the ventilator is in operation for 30 seconds while keeping the revolutions corresponding to the
starting output (taking the remaining of burnt gases from the combustion chamber).
