Maintenance; Notes On Safety For The Maintenance; Maintenance Programme; Maintenance Frequency - Riello RLS 300/EV FGR 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 man-
ufacturer 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.
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 opera-
tions:
Disconnect the electricity supply from the burner by
means of the main switch of the system.
DANGER
Close the fuel interception tap.
DANGER
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.
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.
Measurement of detector current
Measurement of the detector's signal (Fig. 52) with a Voltmeter is
not normally required since the flame signal's intensity is shown on
the AZL...display and operating unit.
Min. value for a good work: 3.5 Vdc (AZL display flame approx.
50%).
If the value is lower, it can depend on:
– sensor positioned incorrectly;
– low current (lower than 96V);
– bad regulation of the burner.
To measure power, use a voltmeter with a 10 Vdc scale, connected
as illustrated in Fig. 52.
D3020
Fan
Check to make sure that no dust has accumulated inside the fan or
on its blades, as this condition will cause a reduction in the air flow
rate and provoke polluting combustion.
49 GB
Fig. 52
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