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3.11 Actuators (SQM33.5...)
Warning notes
To avoid injury to persons, damage to property
or the environment, the following warning notes
should be observed!
WARNING
Do not open, interfere with or modify the actua-
tors!
All activities (mounting, installation and service work, etc.)
must be performed by qualified staff.
Before making any wiring changes in the connection area of
the units, completely isolate the equipment from mains supply
(all-polar disconnection). If not observed, there is a risk of
electric shock hazard.
Ensure protection against electric shock hazard by providing
adequate protection for the connection terminals and by
securing the housing cover.
After any kind of activity (mounting, installation and service
work, etc.), check wiring. Also ensure that the parameters are
correctly set.
Fall or shock can adversely affect the safety functions. Such
units must not be put into operation, even if they do not exhibit
any damage.
The actuator's housing must not be opened.
The actuator contains an optical feedback sys-
tem.
WARNING
Use
The actuators (Fig. 9) are used to drive and position the air damper
and the gas butterfly valve, without mechanical leverages but via
the interposition of an elastic coupling.
They are commanded by the control box, which constantly checks
their position by means of a return signal from the optic sensor in-
side the actuator.
The position (in degrees) of the actuators can be seen on the dis-
play of the Operator Panel.
Index "0" for fuel actuator, index "1" for air actuator.
Installation notes
•
Always run the high-voltage ignition cables separate from the
unit and other cables while observing the greatest possible dis-
tance.
•
The holding torque is reduced when the actuator is disconnect-
ed from power.
When servicing or replacing the actuators, take
care not to invert the connectors.
WARNING
20106891
Technical description of the burner
Technical data
Operating voltage
Safety class
Power consumption
Degree of protection
Opening time 0 - 90°
Firing rate
Cable connection
Direction of rotation
Nominal output torque
Holding
(when live)
Holding
(when dead)
Weight
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
18
GB
D8271
AC / DC 24 V ±20 %
(load on interface)
2 to EN 60 730 part 1 and parts 2...14
max. 10 W
IP54 to EN 60 529-1
min: 5s, max.: 120s
(depending on the type of control box)
0 - 90°
RAST2,5 connectors
Clockwise/anticlockwise
(can be selected from the control box)
3 Nm
torque
3 Nm
torque
2.6 Nm
approx. 1 kg
DIN EN 60 721-3-3
class 3K5
class 3M4
-20...+ 60 °C
< 95 % r.h.
Fig. 9
Tab. J
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