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APPENDIX
Control box - Damper actuators
A
T
R
P
M1
M
~
M2
Z
BV1
R
LR
100%
M
min.
LK
0...
RV
FS
BV: Fuel valve
FS: Flame signal amplifier
LK: Air damper
LR: Load controller
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.
26
B
t7
t1
t3
TSA
t4
t5
t11
t12
7153a10/0498
M: Fan or burner motor
R: Control thermostat or pressurestat
RV: Modulating fuel valve
Z: Ignition transformer
C
D
A: Starting type interval
t6
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
t13
420010466301
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