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12. PROTECTIVE DEVICES
To ensure possibly failure-free and safe operation, the boiler controller
is equipped with numerous protective devices. The software installed con-
trols operation of semi-assemblies and performs monitoring and safety
operations to prevent hazardous conditions (e.g., power outage and its
restoration). When any incorrect status is found an audio alarm is activat-
ed, and a relevant message is shown on the display (see the controller op-
erating manual). To eliminate the effect of voltage fluctuations or incorrect
voltage in the mains, a system controlling the fan rotational speed was
installed (the Hall effect sensor).
When the equipment is installed, each boiler undergoes a test of cor-
rect operation of the control system. The temperature regulator, wiring
and the supply terminal strip are installed in the insulation lid on purpose,
to eliminate access to locations posing a hazard of an electric shock. Ap-
propriate tools must be used to remove them.
TEMPERATURE ALARM
This security device is activated only in the operational mode (when
the boiler temperature is below the set temperature). When the boiler tem-
perature does not rise in the time specified by the user, the alarm is acti-
vated, the feeder and the blower are switched off, and the audio signal is
alarmed. The screen displays the following message:
"Temperature does
not increase”
. When the
encoder
is pressed, the alarm is switched off.
The controller returns to the last set operational mode.
AUTOMATED SENSOR MONITORING
When the central heating system, the domestic hot water sensor or
the fuel feeder sensor is damaged, the audio alarm is activated signalling
additionally a relevant defect on the display, e.g.: "Central heating sensor
damaged". The feeder and the blower are switched off. The pump works
regardless of the current temperature. When the central heating or the
feeder sensor is damaged, the alarm will remain active until the sensor
is replaced with a new one. When the domestic hot water sensor is dam-
aged, press the encoder knob, switching off the alarm, and the sensor will
return to the central heating pump operation). The the domestic hot water
sensor must be replaced with the new one to enable the boiler operation
in all modes.
