35
20135737
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
Check the adjustment of the head as shown in page 18.
Check the adjustment of the air damper servomotor.
Slowly open the manual valves situated upstream from the
gas train.
Adjust the air pressure switch to start of the scale.
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.
6.3
Gas pressure switch
6.4
Air pressure switch
The air pressure switch is set after all other adjustments have
been made. Begin with the switch at the start of the scale.
With the burner function at the required output, turn the knob
slowly in a clockwise direction until burner lockout.
Now turn the knob one notch anti-clockwise and repeat the burn-
er start-up to check everything is regular.
If the burner locks out again, turn the knob again by half a notch.
6.5
Combustion adjustment
In conformity with Efficiency Directive EN 676, the application of
the burner on the boiler, the adjustment and testing must be car-
ried out in compliance with the instruction manual of the boiler, in-
cluding control of the CO and CO
2
concentration in the flue
gases, their temperature and the average temperature of the wa-
ter in the boiler.
It is advisable to set the burner according to the type of gas used
and following the indications in Tab. R.
Tab. R
6
Start-up, calibration and operation of the burner
WARNING
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 regula-
tions of the laws in force.
WARNING
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
Refer to paragraph “Safety test - with gas ball
valve closed” on page 36 before the first start-
up.
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 deliv-
ery at the minimum.
WARNING
To calibrate the gas pressure switch, refer to the
gas train manual.
WARNING
In conformity with the standard, the air pressure
switch must prevent the air pressure falling be-
low 80% of the adjusted value and the CO in the
flue gases exceeding 1% (10,000 ppm).
To check this, insert a combustion analyser in
the flue, slowly reduce the fan air setting (for ex-
ample with a piece of cardboard) and verify that
the burner locks out before the CO value in the
flue gases exceeds 1%.
EN 676
Excess air: max. output
1.2 – min. output
1.3
GAS
Theoretical max
CO2
0 % O2
Setting CO2 %
CO
mg/kWh
NOx
mg/kWh
= 1.2
= 1.3
G 20
11.7
9.7
9.0
100
170
G 25
11.5
9.5
8.8
100
170
G 30
14.0
11.6
10.7
100
230
G 31
13.7
11.4
10.5
100
230
