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6.6
Servomotor adjustment
The servomotor adjusts simultaneously, through driving gears,
the output and pressure of the air and the delivery of the fuel in
use. It performs a 135° rotation in 45s. After the adjustment made
in the factory to its 6 cams to allow an initial ignition.
Check that they are as shown below.
In the event of a modification, follow what is described below for
each cam:
Cam I (RED):
Do not alter the factory setting.
WARNING
Cam II (BLUE):
It is recommended that no adjustments are made.
WARNING
Cam III (ORANGE):
Cam IV (YELLOW):
Not used
Cam V (BLACK):
Not used
Cam VI (GREEN):
Not used
6.6.1
Output upon ignition
According to EN 676 standard:
Burners with MAX output above 120 kW
Ignition must be performed at a lower output than the max. oper-
ation output.
The regulatory standard sets that the value be defined according
to the control box safety time "ts":
•
For "ts" = 2s, ignition output must be equal to or lower than 1/
2 of max. operation output.
•
For "ts" = 3s, ignition output must be equal to or lower than 1/
3 of max. operation output.
Start-up, calibration and operation of the burner
130° (The same for all models).
Limits
rotation
maximum position.
0°
(The same for all models).
Limits rotation toward
minimum position. With the
burner off, the air damper is
completely closed: 0°
20° (The same for all models).
Adjusts the position of ignition
and minimum output of gas
fuel.
toward
20074577
Example:
MAX operation output of 600 kW.
Ignition output must be equal to or lower than:
•
300 kW with ts = 2 s.;
•
200 kW with ts = 3 s.
In order to measure the ignition output:
disconnect the plug - socket 4)(Fig. 7 on page 13) on the
ionisation probe cable (the burner will fire and then go into
lockout after the safety time has elapsed).
Perform 10 ignitions with consecutive lockouts.
Read the quantity of gas burned on the meter.
This quantity must be equal to or lower than the quantity
given by the formula, for ts = 3s:
The ignition output must be adjusted on the brake of the gas
valve 14)(Fig. 6 on page 12).
29
GB
3
Nm
/h
(max. burner delivery)
360
Fig. 27
20148758
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