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6.3
Burner start-up
Close the remote controls and set the switch to 1)(Fig. 31) in "AU-
TO" position.
Check that the lamps or the testers connected to the solenoid
valves or the warning lights on the solenoid valves indicate no
voltage presence.
D11968
6.4
Burner ignition
Once the above steps are complete, the burner should light.
If the motor starts up, but the flame does not appear and the con-
trol box goes into lockout, reset it and wait for a new ignition at-
tempt.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 3 seconds.
In this case increase gas ignition delivery.
The arrival of gas at the pipe coupling is indicated by the U-type
pressure gauge (Fig. 29).
If further burner lockouts occur, refer to the "Release procedure"
given in the equipment manual supplied.
6.5
Combustion air adjustment
Fuel/combustion air synchronisation is done with the relevant
servomotors (air and gas) by logging a calibration curve by
means of the electronic cam.
It is advisable, to reduce the loss and for a wide calibration field,
to adjust the servomotors to the maximum of the output used, the
nearest possible to the maximum opening (90°).
On the gas butterfly valve, fuel step according to the burner out-
put required, with servomotor completely open, is carried out by
the pressure stabiliser placed on the gas train.
The values given in Tab. L may be used as guidelines for correct-
ly calibrating combustion.
EN 676
Theoretical max
CO
GAS
CO
2
0 % O
2
G 20
11.7
G 25
11.5
G 30
14.0
G 31
13.7
Start-up, calibration and operation of the burner
1
Air excess
Max. output.
Min. output
1.2
1.3
% Calibration
2
CO
mg/kWh
= 1.2
= 1.3
100
9.7
9.0
100
9.5
8.8
100
11.6
10.7
100
11.4
10.5
If they indicate the presence of voltage, stop the burner immedi-
ately and check the electric connections.
When the limit thermostat (TL) is closed, the heat request indica-
tion "CALL FOR HEAT" 2)(Fig. 31) must be displayed and the
burner starts the starting cycle.
In the event of a burner lockout, more than two
consecutive burner reset operations could cause
damage to the installation. On the third lockout,
contact the Aftersales Service.
WARNING
If further lockouts or burner faults occur, interven-
tions must only be made by qualified, authorised
personnel (as indicated in this manual, and in
compliance with the laws and regulations current-
DANGER
ly in force).
Once the burner has ignited, proceed with the global adjustment
of the burner.
6.5.1
Air / gas adjustment and output modulation
The air/gas regulator and output modulation system equipping
RS series burners performs a number of integrated functions to
optimise burner function, in both individual installations and in
combination with other units (e.g. double furnace boiler or multi-
ple heat generators in parallel).
The basic system functions control:
1
The dosage of the air and fuel through positioning using
direct servocommands of the relevant valves eliminating the
possible play in the calibration systems with mechanical
cam lever mechanisms, used on traditional modulating
burners.
2
The modulation of the burner output in accordance with the
load required by the system, with maintenance of the pres-
sure or temperature of the boiler at the operating values set.
3
The sequence (cascade adjustment) of more than one
boiler through the suitable connection of the various units
and the activation of the internal software of the individual
systems (option).
Further interfaces and communication functions with computers,
for remote control or integration in central supervision systems
are available on the basis of the configuration of the system.
Tab. L
27
GB
2
Fig. 31
20166543
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