Maintenance; Notes On Safety For The Maintenance; Maintenance Programme; Maintenance Frequency - Riello RS 190/M Installation, Use And Maintenance Instructions

6

Maintenance

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.
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.
6.2

Maintenance programme

6.2.1

Maintenance frequency

The gas combustion system should be checked at
least once a year by a representative of the manu-
facturer 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.
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Maintenance
Before carrying out any maintenance, cleaning or checking opera-
tions:
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 sourc-
es to cool down completely.
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 REPEAT
THE COMPLETE TEST.
6.2.3

Checking and cleaning

The operator must use the required equipment dur-
ing maintenance.
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.
Adjust the burner if the combustion values found at the beginning
of the operation do not comply with the regulations in force, or do
not correspond to good combustion.
Combustion head
Open the burner and make sure that all components of the
combustion head are in good condition, not deformed by the high
temperatures, free of impurities from the surroundings and
correctly positioned.
If in doubt, disassemble the elbow fitting.
Servomotor
Disengage the cam from servomotor and turn it backward and for-
ward by hand to make sure it is free moving.
Now engage cam again (see "Servomotor adjustment" on
page 28).
34 GB