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7
Maintenance
7.1
Notes on safety for the maintenance
The periodic maintenance is essential for the good operation,
safety, yield and duration of the burner.
It allows you to reduce consumption and polluting emissions and
to keep the product in a reliable state over time.
The maintenance interventions and the calibration
of the burner must only be carried out by qualified,
authorised personnel, in accordance with the con-
tents of this manual and in compliance with the
DANGER
standards and regulations of current laws.
7.2
Maintenance programme
7.2.1
Maintenance frequency
The gas combustion system should be checked at
least once a year by a representative of the man-
ufacturer or another specialised technician.
7.2.2
Safety test - with gas ball valve closed
It is fundamental to ensure the correct execution of the electrical
connections between the gas solenoid valves and the burner to
perform safely the commissioning.
For this purpose, after checking that the connections have been
carried out in accordance with the burner's electrical diagrams,
an ignition cycle with closed gas ball valve -dry test- must be per-
formed.
1
The manual ball gas valve must be closed
2
The electrical contacts of the burner limit switch need to be
closed
3
Ensures closed the contact of the low gas pressure switch
4
Make a trial for burner ignition
The start-up cycle must be as follows:
–
Starting the fan for pre-ventilation
–
Performing the gas valve seal control, if provided
–
Completion of pre-ventilation
–
Arrival of the ignition point
–
Power supply of the ignition transformer
–
Electrical Supply of solenoid gas valves
Since the manual gas ball valve is closed, the burner will not light
up and its control box will go to a safety lockout condition.
The actual electrical supply of the solenoid gas valves can be ver-
ified by inserting a tester. Some valves are equipped with light
signals (or close/open position indicator) that turn on at the same
time as their power supply.
IF THE ELECTRICAL SUPPLY OF THE GAS
VALVES OCCURS AT UNEXPECTED TIMES,
DO NOT OPEN MANUAL GAS BALL VALVE,
SWITCH OFF POWER LINE; CHECK THE
WARNING
WIRES; CORRECT THE ERRORS AND RE-
PEAT THE COMPLETE TEST.
Maintenance
Before carrying out any maintenance, cleaning or checking oper-
ations:
Disconnect the electrical supply from the burner
by means of the main system switch.
DANGER
Close the fuel interception tap.
DANGER
Wait for the components in contact with heat
sources to cool down completely.
7.2.3
Checking and cleaning
The operator must use the required equipment
during maintenance.
Electrical wiring
Check that the burner and gas train electrical connections are
correct.
Gas leaks
Make sure there are no gas leaks in the following areas:
–
on the meter-burner pipework
–
on the mixer/valve connection
–
on the burner fastening flange where gaskets are fitted.
Combustion head
Inspect the combustion head and make sure the fabric is undam-
aged and does not feature large or deep holes or corroded areas.
Also make sure that no parts have warped as a result of the high
temperature.
Electrodes assembly
Make sure neither the electrodes nor probe show marked warp-
ing or oxidation on surfaces.
Make sure distances are still in line with those indicated in Fig. 9,
readjusting to the right values where necessary. Where neces-
sary, remove oxide from the surface of the probe with abrasive
paper.
Gas train
Check valve setting and proportionality of operation by analysing
flue gases.
Check the valve/manifold compensation pipe.
21
GB
20123803
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