Maintenance; Notes On Safety For The Maintenance; Maintenance Programme - Riello RL 70/M Installation, Use And Maintenance Instructions

8

Maintenance

8.1

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
contents of this manual and in compliance with the
DANGER
standards and regulations of current laws.
Before carrying out any maintenance, cleaning or checking
operations:
8.2

Maintenance programme

8.2.1 Maintenance frequency
The gas combustion system should be checked at
least once a year by a representative of the
manufacturer or another specialised technician.
8.2.2 Checking and cleaning
The operator must use the required equipment
during maintenance.
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.
If the combustion values measured before starting maintenance
do not comply with applicable Standards or do not indicate
efficient combustion, consult the table below or contact our
Technical Support Service to implement the necessary
adjustments.
EN 267
Theoretical max CO
2
0 % O
2
15.2
Air excess
Max. output Min. output
  1.2   1.3
CO % Calibration
2
 = 1.2  = 1.3
12.6 11.5
Maintenance
DANGER
DANGER
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. 31 on page 26) from the servomotor,
by pressing and moving button 3)(Fig. 31 on page 26) 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. 31 on page 26) to the left.
CO
mg/kWh
 100
Tab. K
29 GB
Disconnect the electrical supply from the burner
by means of the main system switch.
Close the fuel shut-off valve.
Wait for the components in contact with heat
sources to cool down completely.
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