Riello RLS 250/M, Installation, Use And Maintenance Instructions

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20034293
GB
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.
Before carrying out any maintenance, cleaning or checking oper-
ations:
7.2 Maintenance programme
7.2.1 Maintenance frequency
The combustion system should be checked at least once a
year by a representative of the manufacturer or another
specialised technician.
7.2.2 Checking and cleaning
Combustion
The optimum calibration of the burner requires an analysis of the
flue gases.
Significant differences with respect to the previous measure-
ments indicate the points where more care should be exercised
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. If in doubt, extract the internal part 5)(Fig. 45).
UV cell
Clean the glass cover from any dust that may have accumulated.
The UV cell 17)(Fig. 6 at page 13) is held in position by a pres-
sure fit and can therefore be removed by pulling it outward force-
fully.
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.
Burner
Check for excess wear or loose screws in the mechanisms con-
trolling the air gate valve and the gas butterfly valve. Also make
sure that the screws securing the electrical leads in the burner
terminal strip are fully tightened.
Clean the outside of the burner, taking special care with the trans-
mission joints and cam 4)(Fig. 37 at page 30).
Boiler
Clean the boiler as indicated in its accompanying instructions in
order to maintain all the original combustion characteristics in-
tact, especially the flue gas temperature and combustion cham-
ber pressure.
Flame inspection window
Clean the flame inspection window (Fig. 44).
Servomotor
Disengage the cam 4)(Fig. 37 at page 30) from the servomotor,
by pressing and moving button 3)(Fig. 38 at page 30) 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. 38 at
page 30) to the left.
7 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
Close the fuel interception tap.
Wait for the components in contact with heat
sources to cool down completely.
Fig. 44
D484