Riello RS 28/M, Installation, Use And Maintenance Instructions

Page: 31 / 48

Maintenance
29
20154169
GB
6.1 Notes on safety for the maintenance
The periodic maintenance is essential for the good operation, safe-
ty, 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. Before carrying out any maintenance, cleaning or checking opera-
tions:
6.2 Maintenance programme
6.2.1 Maintenance frequency
The combustion system should be checked at least once a year
by a representative of the manufacturer or another specialised
technician.
6.2.2 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 sig-
nals (or close/open position indicator) that turn on at the same time
as their power supply.
6.2.3 Checking and cleaning
Combustion
The optimum calibration of the burner requires an analysis of the
flue gases. Significant differences with respect to the previous
measurements indicate the points where more care should be ex-
ercised during maintenance.
In case the combustion values found at the beginning of the inter-
vention do not respect the standards in force or, in any case, do not
correspond to a proper combustion, contact the Technical Assis-
tant and have him carry out the necessary adjustments.
Combustion head
Open the burner and make sure that all components of the com-
bustion head are in good condition, not deformed by the high
temperatures, free of impurities from the surroundings and cor-
rectly positioned. If in doubt, disassemble the elbow
fitting 7)(Fig. 36, page 31).
6 Maintenance
DANGER
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
standards and regulations of current laws.
DANGER
Disconnect the electrical supply from the burner by
means of the main system switch.
DANGER
Turn off the fuel interception tap.
Wait for the components in contact with heat sourc-
es to cool down completely.
WARNING
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
WIRES; CORRECT THE ERRORS AND REPEAT
THE COMPLETE TEST.
The operator must use the required equipment dur-
ing maintenance.