10/20
Siemens Building Technologies CC1N7153en
HVAC Products 14.10.2002
t3´ Long preignition time:
«Z» connected to terminal 15.
With LAL1...:
«Z» is switched on when start command is given.
With LAL2... / LAL3... / LAL4...:
«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 posi-
tion 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
t4 Interval «BV1 – BV2» or «BV1 - LR»:
-On completion of «t4», voltage is present at terminal 19
-The voltage is required to power «BV2» connected to auxiliary switch «v» in
the actuator
t5 Interval:
-On completion of «t5», terminal 20 receives power. At the same time, con-
trol outputs 9 to 11 and input 8 are galvanically separated from the LAL...’s
control section
®LAL... is now protected against reverse voltages from the load control
circuit
-With the release of «LR» at terminal 20, the startup sequence of the LAL...
ends
-After a few idle steps (steps with no contact position changes), the se-
quence switch switches itself off
B Operating position of the burner
B-C Burner operation:
-During burner operation, «LR» drives the air damper to the nominal load or
low-fire position, depending on heat demand
-Release of the nominal load takes place via auxiliary switch «v» in the ac-
tuator
-In the event of loss of flame during operation, the LAL... will initiate lockout
-For automatic start repetition, the clearly marked wire link «B» on the plug-
in section of the LAL... must be cut away
