DOMUSA TEKNIK BIOCLASS iC 150, Installation And Operating Instructions Manual

Page: 46 / 80

EN
46 BIOCLASS iC 150
15 OPERATION OF THE PELLET ASPIRATION SYSTEM
The fuel suction system is an automatic pellet conveying and suction system equipped with an electronic
control that governs the functioning of a suction device (suction turbine), by controlling the signal from a
sensor that detects the fill level of the tank, located in the cyclonic pot of the reserve tank.
The operation is as follows: when the level sensor detects a low pellet level, the electronic control starts
up the suction turbine, which begins to suck the pellets from the silo or main store and conveys them to
the cyclonic tank in the boiler reserve tank. The suction turbine runs for a set duration (a cycle), while it
fills the cyclonic tank. When the cycle is complete, the suction turbine stops and the hatch on the underside
of the suction pot opens, emptying the pellets inside it into the reserve tank. If the level sensor continues
to detect no pellets when the cyclonic tank has been emptied, the turbine starts up again and runs for
another full cycle. When the sensor detects the filling of the reserve tank (cyclone door open), the control
disables the operation of the fuel feeding system and waits until it starts up again.
During the whole time in which the suction turbine is operating the silo symbol will appear flashing
on the boiler display.
If, after 9 consecutive cycles, the sensor continues without detecting the filling of the reserve tank, the
control will lock-out the suction system and trigger alarm
E-27 (fuel suction system lock-out), on the
boiler display. To unlock the system we should press on the boiler control panel and 9 more
consecutive cycles will rerun or until the sensor detects the tank filling, provided that the timer
programming of the feed system allow it.
When the reserve tank empties alarm E-49 will be enabled, which will cut off boiler operation.
The cycle time may be adjusted using parameter P.22 from the boiler's "Technical" menu (see boiler
manual). With this parameter we can optimise the filling time of the suction pot on the upper part of the
reserve tank, adapting it to the different characteristics of each pneumatic installation (length of suction
pipe, type of extraction system, etc.). The adjustable time range is from a minimum of 35 seconds per
cycle to a maximum of 195. Provided in the following sections are some guide values for cycle times
recommended for various types of installations.