Combustion Head Adjustment; Fixed Gas Delivery Adjustment - Riello GAS 8 P/M Installation, Use And Maintenance Instructions

5.7

Combustion head adjustment

The adjustment of the combustion head depends only on the MIN
and MAX output of the burner.
Therefore, these two values must be set before adjusting the
combustion head.
The head must not be adjusted if in the final set-up the preset
MIN and MAX output values are slightly changed.
Two combustion head adjustments are available:
 One fixed gas delivery adjustment carried out with the
burner open while securing the burner to the boiler page 18.
 One movable adjustment both for gas and air deliveries car-
ried out with the burner closed, as described in page 27.
The notch number is the same for gas and air and
can be obtained from the diagram (Fig. 15) ac-
cording to the burner output.
WARNING
5.7.1

Fixed gas delivery adjustment

 Loosen the screw 1)(Fig. 16)
 Turn the ring nut 2) so that the index 3) matches the required
notch 4)
 Lock the screw 1)
The notch must be chosen from the diagram (Fig. 15) according
to the MAX output required for the burner operation.
Example:
GAS 8 P/M MAX thermal power 1,500 Mcal/h.
NOTCH: 4
When fitting the burner on the two slide bars, it is
advisable to gently draw out the high voltage ca-
ble and the flame detection probe cable until they
are slightly stretched.
WARNING
20148758
Installation
D759
Notches on the ring nut 2)(Fig. 16)
20 GB
GAS
D49
Fig. 15
Fig. 16