PV20a / PV30a pellet burner
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DK9902A1 www.pelltech.eu
WAITING
Burner is turned on and waits for boiler’s thermostat switching on.
There is no
time limits for waiting status. Feeder auger works periodically at WAITING
time – ½ rotations after every 2 minutes. When thermostat switches on,
burner goes to TESTING.
TESTING
At “Testing” time, burner integrity and important device functioning is checked.
Before every startup the burner tests the fan speed, battery voltage and internal
feed auger rotation. The fan is powered to its maximum for 10 sec and must see
PAR7. If the fan speed doesn't reach PAR7 then FAN ERROR will occur on display.
Battery voltage is tested by having the battery power the feeder for one rotation.
If the battery voltage drops below 12V then BATTERY LOW error will be indicated.
The feeder is tested by having to make 1 rot in 8 seconds, if it fails the FEEDER
ERROR will be indicated. Any failure of the above tests will turn off the burner
and will require attention.
LOADING
Feeder auger loads correct amount of fuel needed for ignition into burning
chamber. Loaded fuel amount is measured by counting feeder auger rotations.
Loading is correctly ended when feeder has made PAR24 set rotations. Internal
feeder working depends on fuel level sensor:
If level sensor recognizes pellets in burner feed tube for more than 1s, the
feeder is started.
If feeder makes 1.5 rotations without fuel in feed tube then the feeder stops.
External auger works as need to maintain a constant fuel level in the feeder tube.
All external auger loading is dependent on the fuel level sensor:
If level sensor does not recognize fuel in burner more than 1s, the external
auger is started.
If level sensor recognizes fuel in burner more than 5s, the external auger is
stopped.
Normally the start load is accomplished in 5 mins. But, the start loading time can
take up to 20 minutes if the external auger was empty. If start load is not
accomplished in 20 mins then NO PELLETS will be indicated and the burner will
turn off. After the internal auger has made 10 of the 12 rotations the igniter is
turned on for preheating. Igniter is switched on for 1 min in order to save its
lifetime. At the LOADING time, external auger is holding permanent fuel level in
the feeder tube. Depending of the level sensor signal, the auger is turned on or
off.
IGNITING
Loaded amount of pellets are in the burning chamber, igniter and fan are working
till photocell recognizes the flame. In ignition status igniter heats up, fan starts to
blow hot air to pellets and they will be ignited. Igniter works cyclically. Igniter is
switsched off after every 50 seconds to avoid it’s overheating. Igniter is turned on
again after 20s (normal ignition) or 10s (fast ignition). In ignition mode the igniter
continues and the fan blows hot air at PAR8 set rps over the loaded pellets and
ignites them.If the igniter is turned on for 2m 30sec without flame detection then
the igniter will cycle to 10 seconds off and 50 seconds on to avoid igniter damage.
If no flame is detected for 9m 30 sec then the burner will indicate an IGN.ERROR
and turn off.
LOADING 2
If no flame is detected after 5min 30 sec into the ignition mode second small
load- set PAR25 of pellets is delivered into the burn chamber in a final attempt to
achieve ignition. If flame is not detected after 9 min 30 seconds into the ignition
mode the burner will transition end burn and turn off and the display will indicate
an IGN.ERROR.
