5143
10
BURNER START-UP CYCLE
Venting the gas supply.
This is done by removing the screw from the gas pressure switch, or the pressure test point.
AIR PRESSURE SWITCH (17 Fig.1)
Adjust the air pressure switch after adjustment of all the other
parts of the burner, with air pressure switch setted at beginning
of the scale.
When the burner works (1
st
stage) increase the regulating
pressure, turning the handle slowly in the clockwise till the
burner is locked out.
Then turn back of 1 mbar and repeat the burners starting, in
order to verify the good work; if you have a lock out, turn back
once again of 0.5 mbar.
PUMP’S FIRING
In case of drop-plant with supply from the tank’s bottom, back off the plug at the vacuumeter-joint 9)
(fig. 1), till the leaking of fuel.
In the other two situations, start up the burner, bleed the air of manometer-joint 8) P (fig. 1); if you
have a lock-out, repeat the cycle.
ATTENTION
Before starting up the burner, check that the return pipe has no occlusions.
Any occlusions will cause the break of the pump-sealing organ.
WORK WITH OIL
At the first ignition, when there is the passage from the first to the second flame, there is a strong
decrease of fuel-pressure owing to the filling of second nozzle’s pipe. This decrease can cause the
burn-out of the burner.
COMBUSTION CHECKS
CO
2
It is better to set the burner with CO
2
not higher than 10% (gas with Pci 8600 kcal/m
3
).
So you avoid that a little unsetting (for example draft variation) causes combustion with few air and
with the production of CO.
CO
It must be not higher than 0.1% (thousand parts for million) in accordance to UNI-CIG 8042 norme.
Screw
Pressure gauge fixing point
Pressure switch
S7577
1 ÷ 10
mbar
Regulating handle
S7550
