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Startup sequence
A
Start command by «R»
«R» closes the start control loop between terminals 4 and 5
The sequence switch starts to run
- Only prepurging, fan motor at terminal 6 receives power
- Pre- and postpurging, fan motor or flue gas fan at terminal 7 receives power on completion of «t7»
On completion of «t16», the control command for opening the air damper is delivered via terminal 9
Terminal 8 receives no power during the positioning time
The sequence switch continues to run only after the air damper has fully closed
t1
Prepurge time with air damper fully open
The correct functioning of the flame supervision circuit is checked during «t1»
The burner control will initiate lockout if correct functioning is not ensured
With LAL2 / LAL3:
Shortly after the beginning of «t1», the air pressure switch must change over from terminal 13 to terminal 14
otherwise, the burner control will initiate lockout
start of the air pressure check
t3
Short preignition time
«Z» must be connected to terminal 16, release of fuel via terminal 18.
For use in applications with short preignition, the oil supply must be equipped with two shutoff
valves connected in series.
Observe the following:
EN 298:2012, Section 7.101.3.3 Prepurge time for oil burner control systems and the
corresponding application standards.
t3´
Long preignition time
«Z» connected to terminal 15.
With LAL1
«Z» is switched on when start command is given.
With LAL2 / LAL3
«Z» is switched on when «LP» changes over.
no later than at the end of «t10»
On completion of «t1», the LAL drives the air damper to the low-fire position via terminal 10
the low-fire position is defined by the changeover point of auxiliary switch «m» in the actuator
During the positioning time, the sequence switch maintains its position
until terminal 8 receives power via «m»
The motor of the sequence switch is switched to the control section of the LAL
positioning signals delivered to terminals 8 now have no impact on the further startup sequence and
on subsequent burner operation
TSA
Ignition safety time
On completion of «TSA», a flame signal must be present at terminal 22. It must be available until controlled
shutdown occurs
otherwise, the burner control will initiate lockout and lock itself in the lockout position
t3n
Postignition time
«Z» must be connected to terminal 15
With short preignition, «Z» remains on until «TSA» has elapsed
connection to terminal 16
Building Technologies Division
13/24
CC1N7153en
21.09.2016
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