7/11
Building Technologies Division
CC1N7454en
20.11.2017
Function
In terms of control program and flame supervision (including test of the flame supervision
circuit), the functions of the LFL1.148 correspond of those of the standard units of the
LFL range.
There is a difference however in the control of actuator (SA) and of load controller (LR),
especially with regard to the air damper position on startup and closing of the air damper
during controlled shutdown.
Supervision of the respective start position is accomplished via an auxiliary switch in the
damper actuator whose contact must be included in the start control loop between
terminals 4 and 5.
It must be ensured that the current path between terminals 4 and 5 remains closed until
controlled shutdown takes place.
During controlled shutdown, the air damper is driven to the fully closed position via
contact (Vlb) of the switching mechanism.
Since the switching mechanism of the burner control does not continue to run until
changeover of limit switch (z) in the air damper actuator occurs, the running time of
actuator (SA) is optional.
The pilot flame is supervised by ionization probe (ION1), the main flame by ionization
probe (ION2).
Warning!
On completion of the ignition safety time (TSA), a flame signal must be present
at terminal 23 (ION1). On completion of the second safety time (t9), a flame
signal must also be present at terminal 24 (ION2).
