PV 20a
Working principle
Testing
Before every startup the burner tests itself. At testing time fan is turned on at maximum power. If its
speed doesn´t reach 30 rps, “fan error”will occure on display. Battery loading is turned off and
feeder is turned on. If battery voltage is lower then 12V, “Battery low” error will occure. By testing
the feeder has to make 1 full turn in 8 seconds, if it fails to do it, “feeder error” will occure.
Loading
In the loading cycle, internal feeder loads correct amount of fuel into burning chamber needed for
ignition. Loaded fuel amount is measured by counting internal feeder rotations. Loading is correctly
ended when feeder has made 22 rotations. Internal feeder working depends on fuel level sensor:
• If level sensor recognizes fuel in burner for more than 1s, the feeder is started
• If feeder makes 1.5 rotations without fuel in burner then the feeder stops
External auger is holding permanent fuel level in the feeder tube all loading time depending on level
sensor:
• If level sensor does not recognize fuel in burner more than 1s, the auger is started.
• If level sensor recognizes fuel in burner more than 5s, the auger is stopped.
Maximum loading time is limited with 5 minutes in normal working conditions and 20 minutes after
manual start.
Igniter is preheated in the end of loading cycle. When internal auger has made 10 rotations (full load
rotations* - 12) the igniter is turned on for preheating. If the igniter is turned on more than 1 minute
at loading time, the igniter will be turned off.
• If level sensor recognizes fuel in burner for more than 1s, the feeder is started
• If feeder makes 1.5 rotations without fuel in burner then the feeder stops
Igniting
In ignition state the igniter is heated up and fan blows hot air through loaded pellets and ignites
them.
Igniter is turned off after every 50 seconds to avoid overheating it, and turned on again after 20s .
Preburn
The purpose of preburn state is to fully ignite the pellets. No fuel is added at preburn. Fan works at
the same speed as in ignition.
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