Start-Up, Calibration And Operation Of The Burner; Notes On Safety For The First Start-Up; Adjustments Prior To Ignition; Burner Ignition - Riello 663 T80 Installation, Use And Maintenance Instructions

8

Start-up, calibration and operation of the burner

8.1

Notes on safety for the first start-up

The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and
regulations of the laws in force.
ATTENTION
8.2

Adjustments prior to ignition

Burner ignition must be carried out by qualified
personnel with the appropriate tools.
ATTENTION
8.2.1

Burner ignition

Turn off the remote controls and set the switch 1)(Fig. 27) to
"MAN".
Once ignition has taken place, proceed with burner global
calibration operations.
8.2.2

Adjusting the burner

The optimum adjustment of the burner requires an analysis of
flue gases at the boiler outlet.
The adjustments that have already been performed and
generally do not need variations are:
– Combustion head
– Servomotor, cams I - II - IV
Whereas the following must be adjusted one after the other:
1 - MAX burner output
2 - MIN burner output
3 - Intermediate outputs between Min. and Max.
1 - MAXIMUM OUTPUT
MAX output must be selected within the firing rate range shown
on page 10
In the above instructions we left the burner running at the MIN
output. Now press the button 2)(page 24) "+" and keep it pressed
until the servomotor has reached 90°.
Nozzle output adjustment
The nozzle output varies depending on the light oil pressure on
the nozzle return line.
The diagram (Fig. 28) indicates this relation for Bergonzo type A3
nozzles with a 20 bar pump delivery pressure.
20167399
Start-up, calibration and operation of the burner
1 2
D791
Check the correct working of the adjustment,
command and safety devices.
ATTENTION
NOTE:
With a 20 bar pump delivery pressure, the nozzle return line
pressure must not be greater than 17 bar. The pressure
difference between pump delivery and nozzle return line
must be at least 3 bars. With smaller pressure differences,
the nozzle return line pressure may be unstable.
Fig. 27
To set the maximum nozzle output, vary the upper cam end
profile 7)(Fig. 29) using the screws 8).
The value of the pressure on the return line of the nozzle is shown
on the pressure gauge 10).
Air adjustment
There are two air dampers, 1) and 2)(Fig. 30), for air regulation.
Air dampers factory set at maximum opening.
First adjust the air damper 2) which must be closed progressively
until optimal combustion is achieved. If the total closure of the air
damper 2) is not sufficient, close the air damper 1) secondly as
follows:
adjust the lower cam end profile 4)(Fig. 29) by turning the screws
5) that appear inside the opening 6).
If the burner is operated at full power, the fan air may not be
sufficient even with both air dampers 1) and 2) fully open. In this
case, remove the air damper 2) and adjust the air with air damper
1) only, as explained above.
Cams 7) - 4)(Fig. 29):
– to increase the output, tighten the screws 8)-5);
– to decrease the output, undo the screws 8)-5);
24 GB
D870
Nozzle output
Fig. 28