Technical description of the burner
15
20102152
GB
3.11 Actuators (SQM33.5...)
Warning notes
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.
Use
The actuators (Fig. 8) 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.
Technical data
Tab. G
WARNING
To avoid injury to persons, damage to property
or the environment, the following warning notes
should be observed!
Do not open, interfere with or modify the actua-
tors!
WARNING
The actuator’s housing must not be opened.
The actuator contains an optical feedback sys-
tem.
WARNING
When servicing or replacing the actuators, take
care not to invert the connectors.
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
(when live)
3 Nm
Holding torque
(when dead)
2.6 Nm
Weight
approx. 1 kg
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
DIN EN 60 721-3-3
class 3K5
class 3M4
-20...+60 ×C
< 95 % r.h.
D8271
Fig. 8
