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APPENDIX
Control box - Damper actuators
CONTROL BOX LFL 1.../LGK...
R: Temperature or pressure controller
M: Fan motor
Z: Ignition transformer
BV: Fuel valve(s)
DAMPER ACTUATORS SQM50...
Description
The SQM actuator is intended for use with two-stage sliding or modulating oil, gas or dual-fuel burners. The reversible actuator is fitted
with a synchronous motor which drives a shaft via a gearbox. The shaft end carries a coupling to drive the fuel and combustion air
controlling element.
The SQM actuator has been designed for dual-wire control by controller or switching units with change-over contacts.
Potentiometers can be installed for a range of applications on customer's request.
The limit and auxiliary switches are set by means of manually adjustable latching cam plates. Scales are fitted between the disks to
facilitate the selection of the switching points.
The cam plates are provided with a small pointer for indicating the switching point of a scale between the setting ranges.
An additional scale fitted to the end of the cam roller serves to indicate the position of the actuator.
The drive unit may be disconnected from the controlling element by changing over a rocker arm mounted to the gearbox.
This will allow any desired position of the controller plate to be selected by hand. Drive and output will be coupled in the vertical
position of the rocker arm.
The fuel-air curve should be set over the full range of the cam plate so that operating safety will be retained also when the limit switch
is overrun.
420010511800
LR: Load regulator
LK: Air damper
RV: Steadily adjustable fuel valve
FS: Signal of flame
The LFL 1.../LGK... type controller is
designed to control and monitor burners
working according to a stepwise or
modulating principle. A detailed functional
description with technical data and project
planning information with respect to the
automatic combustion controllers can be
found in the annex and in the documents:
LFL 1...-7451/LGK...
Functional diagram
LFL 1.../LGK...
A: Starting type interval
A-B: Flame development interval
B: Burner has reached operating position
B-C: Burner operation (heat generation)
C-D: Regular shut-off
t1: Pre-ventilating time
t2: Safety time
t3: Pre-ignition time
t4: Fuel valve enable
t5: Load regulator enable
t11: "OPEN" run time of air damper
t12: "CLOSE" run time of air damper
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