20168415
26
GB
Start-up, calibration and operation of the burner
6.1
Notes on safety for the first start-up
6.2
Adjustments prior to ignition
The following adjustments must be carried out:
open the manual valves upstream of the gas train.
Adjust the minimum gas pressure switch to the start of the
scale (Fig. 33).
Adjust the air pressure switch to the start of the scale
(Fig. 32).
Purge the air from the gas line.
We recommend using a plastic tube routed outside the
building and to purge air until gas is smelt.
Assemble a pressure gauge (Fig. 26) on the gas pressure
test point of the pipe coupling.
The manometer readings are used to calculate MAX burner
output using the .
Connect two lamps or testers parallel to the two gas line
solenoid valves VR and VS in order to check the exact
moment at which voltage is supplied.
This operation is not required if each of the two solenoid
valves is equipped with a pilot light that signals voltage
passing through.
6.3
Servomotor adjustment
The servomotor provides simultaneous adjustment of the air
damper, by means of the variable 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; just check that
they are as specified below:
6
Start-up, calibration and operation of the burner
ATTENTION
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
Check the correct working of the adjustment,
command and safety devices.
ATTENTION
Before starting up the burner, refer to section
"Safety test - with no gas supply” on page 32.
CAUTION
Before starting up the burner, it is good practice to
adjust the gas train so that ignition takes place in
conditions of maximum safety, i.e. with gas
delivery at the minimum.
Excessive gas pressure can damage the
components of the gas train and lead to a risk of
explosion.
Fig. 26
D3841
ATTENTION
Do not alter the factory setting for the 4 cams;
just check that they are as specified below:
Cam I:
90°
.
Limits rotation toward maximum
position.
When the burner is at MAX output, the gas
butterfly valve must be fully opened: 90°.
Cam II:
0°
. Limits rotation toward minimum position.
When the burner is shut down, the air
damper and gas butterfly valve must be
closed: 0°.
Cam III:
15°
. Adjusts the ignition position and the MIN
output.
Cam IV:
Integrated with cam III.
Fig. 27
D790
