15
FINAL CHECKS
(with the burner working):
• disconnect a wire of the minimum gas pres-
sure switch;
• switch on the thermostat/pressure switch TL;
• switch on the thermostat/pressure switch TS;
the burner must stop.
• disconnect the air adduction tube of the pres-
sure switch;
• disconnect the wire of the ionisation probe;
the burner must stop in lockout.
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.
MAINTENANCE
The burner requires periodic maintenance
carried out by a qualified and authorised
technician
in conformity with legislation and
local standards
.
Periodic maintenance is essential for the
reliability of the burner, avoiding the
excessive consumption of fuel and consequent
pollution.
Before carrying out any cleaning or
control, always switch off the electrical
supply to the burner, using the main switch of
the system.
Combustion
The optimum calibration of the burner requires
an analysis of the flue gases. Significant differ-
ences with respect to the previous measure-
ments indicate the points where more care
should be exercised during maintenance.
Gas leaks
Make sure there are no gas leaks on the pipe-
work between the gas meter and the burner.
Gas filter
Substitute the gas filter when dirty (see train
instructions).
Combustion head
Open the burner and make sure that all compo-
nents of the combustion head are in good condi-
tion, not deformed by the high temperatures,
free of impurities from the surroundings and cor-
rectly positioned. If in doubt, disassemble the
elbow.
Servomotor
Release the cam 4)(A)p.12, rotating by 90° the
notch 2)(A)p.12, and manually check that it
rotates smoothly backwards and forwards. Con-
strain the cam again 4)p.12.
Burner
Check for excess wear or loose screws in the
mechanisms that control the air damper and the
gas butterfly valve. In addition, the screws that
fix the cables in the terminal board must be
blocked, along with the burner sockets.
Clean the outside of the burner, taking special
care with the transmission joints and cam
4)(A)p.12.
Combustion
Adjust the burner if the combustion values found
at the beginning of the operation do not comply
with the regulations in force, or at any rate, do
not correspond to good combustion.
Use the appropriate card to record the new
combustion values; they will be useful for subse-
quent controls.
