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3.11
Actuators (SQM33.5...)
Warning notes
To avoid injury to persons, damage to proper-
ty or the environment, the following warning
notes should be observed!
WARNING
Do not open, interfere with or modify the actu-
ators!
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
system.
WARNING
Use
The actuators (Fig. 8) are used to drive and position the air
damper and the gas butterfly valve, without mechanical leverag-
es 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 inside the actuator.
The position (in degrees) of the actuators can be seen on the
display 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
20017786
Technical description of the burner
Technical data
16
Operating voltage
AC / DC 24 V ±20 %
(load on interface)
Safety class
2 to EN 60 730 part 1 and parts 2...14
Power consumption
max. 10 W
Degree of protection
IP54 to EN 60 529-1
Opening time 0 - 90°
min: 5s, max.: 120s
(depending on the type of control box)
Firing rate
0 - 90°
Cable connection
RAST2,5 connectors
Direction of rotation
Clockwise/anticlockwise
(can be selected from the control box)
Nominal output torque
3 Nm
Holding torque
3 Nm
(when live)
Holding torque
2.6 Nm
(when dead)
Weight
approx. 1 kg
Environmental conditions:
Operation
DIN EN 60 721-3-3
Climatic conditions
class 3K5
Mechanical conditions
class 3M4
Temperature range
-20...+60 ×C
Humidity
< 95 % r.h.
D8271
Fig. 8
Tab. J
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