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3.12 Actuator
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 actuators!
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 actuator, completely isolate the burner control from the
mains supply (all-polar disconnection).
Ensure protection against electric shock hazard by providing
adequate protection for the connection terminals and by
securing the housing cover.
Check to ensure that wiring is in an orderly state.
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 housing cover may only be removed for short
periods of time for wiring or when making the ad-
dressing.
WARNING
It must be made certain that dust or dirt will not get
inside the actuator while such work is carried out.
Use
The actuators (Fig. 9) 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.
When used in connection with burner controls or electronic fuel / air
ratio control, the associated controlling elements are controlled de-
pending on burner output.
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's power sup-
ply is switched off.
When servicing or replacing the actuators, take
care not to invert the connectors.
WARNING
Technical description of the burner
Technical data
Operating voltage
Safety class
Power consumption
Degree of protection
On time
Electrical connections
Direction of rotation
(when facing the shaft)
Running time (min.)
for 90°
Holding torque (max.)
Nominal torque (max.)
Weight
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
17
GB
D8271
AC 2 x 12 V via bus cable from the ba-
sic unit or via a separate transformer
Extra low-voltage with safe isolation
from mains voltage
9...15 VA
To EN 60 529, IP 54, provided ade-
quate cable entries are used
50 %, max. 3 min. continuously
RAST3.5 terminals
- Standard: counterclockwise
- Reverse: clockwise
10 s.
1.5 Nm
3 Nm
approx. 1 kg
DIN EN 60721-3-1
class 1K3
class 1M2
-20...+60 ×C
< 95 % r.h.
Fig. 9
Tab. H
20069791
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