Maintenance - Riello RL 70/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento

9

Maintenance

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:
disconnect the electricity supply from the burner
by means of the main switch of the system;
DANGER
close the fuel interception tap.
DANGER
Combustion
It is required an analysis of the flue gases at the boiler outlet. Sig-
nificant differences with respect to the previous measurements
indicate the points where more care should be exercised during
maintenance.
Pump
The pump delivery pressure must be stable at 20 bar.
The depression must be less than 0.45 bar.
Unusual noise must not be evident during pump operation.
If the pressure is found to be unstable or if the pump runs noisily,
the flexible hose must be detached from the line filter and the fuel
must be sucked from a tank located near the burner. This meas-
ure permits the cause of the anomaly to be traced to either the
suction line or the pump.
If the pump is found to be responsible, check to make sure that
the filter is not dirty. The vacuum meter is installed up-line from
the filter and consequently will not indicate whether the filter is
clogged or not.
Contrarily, if the problem lies in the suction line, check to make
sure that the filter is clean and that air is not entering the piping.
Servomotor
Disengage the cam 2)(Fig. 29 page 22) from the servomotor, by
pressing and moving button 3)(Fig. 30 page 23) towards the
right, and turn it backwards and forwards by hand to make sure it
moves freely. Now engage the cam again by moving the button
2)(Fig. 30 page 23) to the left.
Maintenance
Filters (Fig. 33)
Check the following filter boxes:
• on line 1) • in pump 2) • at nozzle 3), and clean or replace as
required.
If rust or other impurities are observed inside the pump, use a
separate pump to suck out any water and other impurities that
may have deposited on the bottom of the tank.
Combustion head
Check to make sure that all the parts of the combustion head are
in good condition, positioned correctly, free of all impurities, and
that no deformation has been caused by operation at high tem-
peratures.
Nozzle
Do not clean the nozzle openings.
Replace the nozzles every 2-3 years or whenever necessary.
Combustion must be checked after the nozzles have been
changed.
Flame sensor (Fig. 34)
Clean the glass cover from any dust that may have accumulated.
The sensor 1) can be removed by pulling it outward forcefully.
D1232
25 GB
D707
Fig. 33
Fig. 34
2915996