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11-SAFETY DEVICES AND ALARMS
NORMAL SHUTDOWN (on the panel: OFF with flashing flame)
If the shutdown key is pressed or if there is an alarm signal, the boiler goes into the thermal shutdown phase which entails the automatic
execution of the following stages:
•
It stops pellets loading
•
The room fan (if provided) maintains the set speed until the smoke T reaches 100°C, then it automatically sets itself at the minimum
speed until it reaches the shutdown temperature
•
The smoke fan sets itself at maximum speed and maintains it for a fixed time of 10 minutes, at the end of which if the smoke T has
fallen below the shutdown threshold it switches off permanently, otherwise it sets itself at the minimum speed until it reaches such
threshold before switching off.
•
If the boiler was shutdown regularly but, due to thermal inertia the smoke temperature exceeds the threshold again, the shutdown
stage restarts at the minimum speed until the temperature goes down.
BLACKOUT WITH THE BOILER ON
In the event of a power cut (BLACKOUT) the boiler behaves as follows:
•
Blackout below 10": it returns to its operation in progress;
•
In the event of a power cut that lasts over 10" with the boiler on or in the start-up stage, when the boiler is powered again it goes
back to the previous operating condition with the following procedure:
1. It cools down activating the smoke extractor at minimum power for 10' and goes onto the next point;
2. It takes the boiler back to the operating condition before the blackout.
During stage 1 the panel displays ON BLACK OUT.
During stage 2 the panel displays Start-up.
If during stage 1 the boiler receives commands from the panel and thus carried out manually by the user, then the boiler stops executing
the blackout recovery status and proceeds to restart or shutdown as requested by the command.
BLACKOUT ABOVE 10" WITH BOILER IN SHUTDOWN STAGE
In the event there is a power cut that lasts MORE THAN 10" with the boiler in the shutdown stage, when the boiler is powered again it
restarts in shutdown mode even if the smoke temperature has fallen under 45°C in the meanwhile. This last stage can be skipped by
pressing key 1 (esc) (it goes into start-up) and by pressing it again (it recognises that the boiler is switched off).
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