PV700a / PV1000a pellet burners
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DK9401B1 www.pelltech.eu
At
IGNITING
cycle the igniter is heated up and fan blows hot air on pellets in burning chamber. Hot air
ignites pellets. Igniter is working periodically at ignition time in order to avoid its overheating.
Igniter is pre-heated already in the end of loading cycle. When internal auger has made 10 rotations (full
number of load rotations is 12) the igniter is turned on for pre-heating. If the igniter has been turned on
more than 1 minute at LOADING time, then it will be turned off.
Table 13 IGNITING parameters and timing
PAR No
Parameter name
Default
value
Unit
Comment
PAR8
FAN @IGNITING
25
rps
Primary fan speed at ignition.
-
Max ignition time
255
sec
Maximum ignition time.
-
Time of first loading
20
min
Maximum loading time after manual start.
-
Auger start
3
sec
Auger Start delay if no fuel in burner.
-
Auger stop
3
sec
Auger Stop delay if fuel in burner.
-
Feeder start
1
sec
Feeder Start delay if fuel in burner.
-
Feeder stop
4
rot
Feeder rotations made without fuel level before
stopped.
The purpose of
PRE-BURN
status is to create stabile flame and assure effective pellets burning procedure
after ignition. Minimum fuel amount is added periodically at pre-burn time. Fans are working with same
speed as at IGNITION. Feeder auger makes ½ rotations at every 25 sec up to 6 rotations achieved. See
Table 14.
Table 14 PRE-BURN parameters
PAR No
Parameter name
Default
value
Unit
Comment
PAR8
FAN@IGNITING
20
rps
Primary fan speed at IGNITING and PRE-BURN
PAR39
FAN 2 MIN
7
rps
Secondary fan’s minimum speed. Used at
IGNITING, PRE-BURN, HEAT UP, HOLD FLAME
and END BLOW statuses.
PAR41
PRE-BURN TIME
25
s
Length of one PRE-BURN cycle.
PAR42
PRE-BURN CYCLES
6
x
Number of PRE-BURN cycles.
-
Pre-burn feed
1/2
rot
Number of feeder auger’s rotations at each
PRE-BURN cycle.
HEAT UP
cycle is needed to slow down too fast heating up of the burning chamber’s ceramic stones in
order to minimize their thermal stress and thus prolong their lifetime.
