Riello RS 25/E BLU Series, Installation, Use And Maintenance Instructions

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20068118 20
GB
Technical description of the burner
4.14 Servomotors (SQN13...)
Introduction
The servomotors that equip the burners of the
RS
range work di-
rectly on the air damper and the gas butterfly valve, without me-
chanical 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 inside the servomotor.
Important notes
 All interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
 Before modifying the wiring in the servomotor connection
area, fully disconnect the burner control device from the
power supply (omnipolar separation)..

To avoid the risk of electrocution, protect the connection ter-
minals in a suitable manner and correctly fix the cover.

In the event of assembly, installation, maintenance, etc... it is
necessary to check that the wiring and the parameterisation
are in order.
 Falls and collisions can negatively affect the safety func-
tions. In this case, the unit must not be operated, even if it
displays no evident damage.
Installation notes
 Check the relevant national safety standards are respected.

The connection between the actuator command shaft and
the control element must be rigid, without any mechanical
play.
 The tightening torque for the fixing screws should be 1.5 Nm.
It is recommended that this value is not exceeded to prevent
damaging the servomotor.

To avoid an excessive load on the bearings due to rigid
hubs, the use of compensation clutches without any
mechanical play is recommended (e.g. metal bellows-type
clutches).

It is advisable to oversize the drive shaft in relation to the
rated torque of the actuator.

The static torque is reduced when the electrical supply of the
actuator is switched off.

Arrange the H.V. ignition cables separately, as far as possi-
ble from the control box and the other cables.
Technical data
Tab. I
WARNING
To avoid accidents, material or environmental
damage, observe the following instructions!
Avoid opening, modifying or forcing the servo-
motor. The servomotor is equipped with a system
of optical feedback.
Power supply AC / DC 24 V ± 20% (load inter-
face)
Safety class EN 60730 part 1-14
Power absorption Max. 7.5 W
Angle adjustment, usable
range
Max. 90°
Degree of protection IP40
Work of field 0-90°
Opening time 0-90° Min 5 sec.
Max 120 sec. depending on the
control box type
Direction of rotation Anticlockwise
Torque operating 0.7 Nm
Torque off 0.4 Nm
Cable length 1.2 m
Radial load on the bearing 30 N
Axial load on the bearings Max. 5 N
Weight About 0.3 kg
Connecting cable RAST2.5
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity DIN EN 60721-3-3
Class 3K3
Class 3M3
-10 ... +60 °C
< 95% RH
WARNING
Condensation, formation of ice and the entrance
of water are not permitted!
Fig. 10
D8083