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6.4
Burner ignition
If the motor starts but the flame does not appear and the control
box goes into lockout, reset and wait for a new ignition attempt.
If ignition does not occur, it may be that the gas is not reaching
the combustion head within the safety time of 3 seconds; there-
fore, the gas ignition delivery must be increased.
6.5
Servomotor adjustment
The servomotor (Fig. 28) adjusts simultaneously, by cross-refer-
encing, the flow rate and pressure of the air and flow rate of the
fuel in use.
It is equipped with adjustable cams which operate the same num-
ber of switches.
Cam I:
not used
Cam II:
limits the limit switch of the servomotor on po-
sition 0. With the burner off, the air damper is
completely closed.
Cam III:
not used
Cam IV:
limits the limit switch of the servomotor on po-
sition max (approx. 130°).
Cam V:
regulates the minimum modulation output; fac-
tory set at 45°.
Remaining cam: not used
Lever 7:
servomotor reset
6.6
Burner adjustment and output modulation
6.6.1
Maximum output
The servomotor (Fig. 28) must be adjusted to the maximum
opening so that the air dampers are completely open.
6.6.2
Minimum output
The MIN output must be set within the firing rate indicated on
page 10.
Turn the selector 2)(Fig. 27) "output reduction", and keep it
turned to - until the servomotor has closed the air damper and the
gas butterfly valve at 45° (adjustment made in the factory).
Air adjustment
The starting profile of cam 1)(Fig. 29) must be progressively ad-
justed by turning screws 2)(Fig. 29).
It is preferable not to turn the first screw since this
is used to set the air damper to its fully closed po-
sition.
WARNING
Start-up, calibration and operation of the burner
The arrival of gas at the pipe coupling is indicated by the U-type
pressure gauge (Fig. 26).
If lockout of the burner occurs again, see chapter "Problems -
Causes - Remedies signalled by LED indicators" on page 35.
Once the burner has ignited, proceed with the global adjustment
of the burner.
S8446
1
Key (Fig. 29)
1
Cam
2
Adjustment screws
3
Locking screws
4
Adjustable profile
25
GB
7
2
4
D1499
Fig. 28
3
Fig. 29
20145860
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