3.10 Control Box For The Air/Fuel Ratio; 3.11 Servomotor - Riello RS 50/M MZ Manuel D'entretien

Technical description of the burner
3

3.10 Control box for the air/fuel ratio

Introduction
The RMG/M 88.62... control box included in burners of RS range
is designed to control and start up forced draught gas burners
with intermittent operation.
In compliance with:
- Technical Standard EN676 (gas burners)
- Technical Standard EN298 (gas appliances)
Fig. 6
All the installation, maintenance and disassembly
operations must be carried out with the electricity
supply disconnected.
DANGER
To avoid damaging things or injuring people, do not
open or alter the control box.
The installation of the burner must be carried out
by qualified personnel, in compliance with the
standards and regulations of the laws in force.
WARNING
Technical Data
Electrical supply
Frequency
Internal fuse
Operation below the nominal value of electrical supply
Minimum operation value
on reduction of electrical supply
below nominal value
Minimum operation value
on increase in electrical supply
towards nominal value
Maximum load of the contacts:
Alarm exit
Nominal power supply
Maximum current
Allowed cable length
Thermostat
Air pressure switch
CPI
Gas pressure switch
Flame detector
Remote reset
M4 screws tightening torque
AC 220.....240V
+10% / -15%
50.....60 Hz +/- 6%
T6,3H250V
approx. AC 160V
approx. AC 175V
AC 230V, 50/60 Hz
0.5 A
max. 20 m at 100 pF/m
max. 1 m at 100 pF/m
max. 1 m at 100 pF/m
max. 20 m at 100 pF/m
max. 1 m
max. 20 m at 100 pF/m
max. 0.8 Nm

3.11 Servomotor

The servomotor provides simultaneous adjustment for the air
damper, by means of the adjustable profile cam and the gas
butterfly valve.
The angle of rotation of the servomotor is equal to the angle
on the graduated sector controlling the gas butterfly valve.
The servomotor rotates by 90° in 24 seconds.
Do not alter the factory setting for the 4
cams; simply check that they are set as indi-
cated below:
WARNING
Cam I: 90°
Limits rotation toward maximum position.
When the burner is at MAX output, the gas butterfly valve
must be fully open: 90°.
Cam II: 0°
Limits rotation toward minimum position.
When the burner is shut down, the air damper and gas butter-
fly valve must be closed: 0°.
Cam III: 15°
Adjusts the ignition position and the MIN output.
Cam IV: integrated to cam III.
Fig. 7
9
GB
D790
6463