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Function (cont´d)
Control of the burner
Flame supervision
Preconditions for
burner startup
With the exception of LAL1
12/24
Building Technologies Division
Burner operation with or without postpurge
Fan motors with a current draw of up to 4 A can be connected directly starting
current max. 20 A (for max. 20 ms)
Separate control outputs for
– preignition from start command
– postignition until shortly before the burner startup sequence is completed
– short preignition with postignition up to the end of «TSA»
Separate control outputs for the actuator's positioning directions «OPEN»,
«CLOSE» and «MIN»
Checked air damper operation to ensure prepurging with the nominal air volume
Checked positions:
- «CLOSED» or «MIN» on startup low-fire position
- «OPEN» at the beginning of prepurging
- «MIN» on completion of prepurging
If the actuator does not drive the air damper to the required position, the burner
startup sequence will be stopped
2 control outputs for the release of the second and third output stage or for load
control
When load control is enabled, the control outputs for the actuator will be
galvanically separated from the burner control's control section
Connection facilities for
– remote lockout warning device
– remote reset
– remote emergency shutdown
In addition, with LAL2 / LAL3:
– possibility of air pressure supervision with functional test of the air pressure
monitor on startup
– possibility of semiautomatic burner startup
Flame detector and flame simulation test are made automatically during burner off
times and the prepurge time «t1»
If loss of flame occurs during operation, the burner control will initiate lockout
If automatic repetition of the startup sequence is required, the clearly marked wire
link on the plug-in section of the LAL must be cut away start repetition
Burner control is not in the lockout position
Sequence switch is in its start position
with LAL1, voltage is present at terminals 4 and 11
with LAL2 / LAL3, voltage is present at terminals 11 and 12
Air damper is closed
End switch «z» for the «CLOSED» position must feed power from terminal 11 to
terminal 8
Contact of the limit thermostat or pressure switch «W» and the contacts of any
other switching devices in the control loop between terminals 4 and 5 must be
closed e.g. a control contact for the oil preheaters temperature
Normally closed contact of the air pressure switch must be closed «LP» test.
CC1N7153en
21.09.2016
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