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Lohberger Heiztechnik
GmbH
Operating Instructions
N29/HB/GB
page 5
Lohberger Heiztechnik GmbH, A-5020 Salzburg-Bergheim, Rechtes Salzachufer 40
Tel. 0662-450444-0, Fax-DW 9
Es gelten unsere aktuellen allgemeinen Geschäftsbedingungen. Irrtum, Druckfehler und technische Änderungen vorbehalten
3.2
Safety Features
The temperature sensor and oxygen sensor monitor the boiler at each stage of combustion. If the
system is set to "OFF " by pressing the
button during operation, the control function will remain
in operation until combustion of the loaded fuel.
At combustion chamber elevated temperatures and after a power failure, the system is automatically
brought into service in order to avoid uncontrolled combustion (danger of deflagration).
Frost protection criteria (system set to "OFF"):
The
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A has an extensive anti-freeze function that protects the complete system
against frost damage.
After the activation of one of the frost protection criteria, the boiler is temporarily started if the
system is set to "OFF"; the display will change to flashing "ON" when preventing frost damage to the
system by starting the pellets burner.
In general, the frost protection function is activated when the outside temperature falls below an
average of -3°C during a 24 hour period and the upper buffer or the boiler temperature fall below
15°C. In addition, the following criteria apply:
A) Protection of domestic hot water reservoir:
The boiler starts the pellets burner autonomously if the temperature probe of boiler I and/or boiler II
registers a temperature below 6°C.
After the level for Initial Heating Low Temperature Mode (default setting 35°C) the boiler switches to
"OFF". During this phase, the control device displays "Risk of Frost DOM.WATER burner activated".
B) Protection of heating circuits:
If frost protection function is activated, heating circuits are monitored by cyclically flushing of the
heat circuit pumps for one minute every 20 minutes. During this minute, the control device displays
"Pump ON for 60 sec. for FROST PROTECTION".
If the preliminary temperature falls below 6°C, the pellets burner starts autonomously and runs until
the frost protection criteria are met and switches "OFF" subsequently. During this phase, the control
device displays "Risk of Frost DOM.WATER burner activated".
C) Protection of boiler:
The boiler starts the pellets burner autonomously if the temperature probe of the boiler registers a
temperature below 6°C.
The pellets burner runs until the minimal boiler runtime is reached and switches "OFF" subsequently.
During this phase, the control device displays "Risk of Frost DOM.WATER burner activated".
NOTICE:
If no or not enough pellets are in place, the frost protection functions mentioned above
cannot be executed!!!
When the power is off or when the boiler is in standby mode (Display: Standby), the burn back
monitoring function is active, i.e. the feed auger feeds back the hot material from the feed channel
into the combustion chamber.
