Maintenance; Notes On Safety For The Maintenance; Maintenance Programme; Maintenance Frequency - Riello RX 360 S/PV Modulating Operation

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.
Before carrying out any maintenance, cleaning or checking oper-
ations:
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 no gas supply

To perform commissioning in safety conditions, it is very
important to check correct wiring between gas valves and burner.
For this purpose, after checking that connections comply with the
burner wiring diagrams, it is necessary to carry out a start-up
cycle with gas cock closed (dry test).
1 The manual gas valve must be closed using the locking/
unlocking device ("Lock-out / tag out" procedure).
2 Ensure that burner limit electrical contacts are closed
3 Ensure that minimum gas pressure switch contact is closed
4 Try to start the burner.
The start-up cycle must occur according to the following steps:
– Fan motor start-up for pre-purging
– Gas valve leak detection control, if applicable.
– Pre-purging completion
– Achievement of the ignition point
– Power supply of the ignition transformer
– Supply of gas valves.
As gas is closed, the burner cannot ignite and its control box will
switch to stop or safety lockout condition.
The actual supply of gas valves can be checked by inserting a
tester; some valves are equipped with lights (or closing/opening
position indicators) that activate as soon as they are powered.
IF POWER
OCCURS IN UNEXPECTED MOMENTS, DO
NOT OPEN
DISCONNECT
WARNING
WIRINGS, CORRECT THE ERRORS AND
CARRY OUT THE WHOLE TEST AGAIN.
20068189
SUPPLY OF GAS VALVES
THE MANUAL VALVE,
POWER SUPPLY, CHECK
Maintenance
Disconnect the electrical supply from the burner
by means of the main system switch.
DANGER
Turn off 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.
Hoses
Check there are no occlusions or obstructions in the fuel supply
pipes, in the air suction areas and in the combustion product
waste pipe.
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 on
pag. 20, readjusting to the right values where necessary. Where
necessary, remove oxide from the surface of the probe with abra-
sive paper.
28 GB