Startup Sequence - Siemens LAL1.25 Manual

Oil burner controls lal1 series; lal2 series; lal4 series
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Flame supervision
Preconditions for
burner startup

Startup sequence

Siemens Building Technologies
HVAC Products
-
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... / LAL4..., 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 ter-
minal 8
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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 preheater's temperature
With the exception of LAL1...
Normally closed contact of the air pressure switch must be closed ® «LP» test
-
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... / LAL4...:
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
9/20
CC1N7153en
14.10.2002

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This manual is also suitable for:

Lal2.14Lal2.25Lal4.25a27Lal2.65Lal3.25

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