Intermediate Outputs; Combustion Air Adjustment; Air / Fuel Adjustment - Riello RS 1000/M BLU Manual

6.6.3

Intermediate outputs

After adjusting the maximum and minimum output of the burner,
carry out air and gas adjustment on other intermediate positions
of the servomotor.
The passage from one position to the next one is obtained by
pressing the selector 2)(Fig. 27) on the symbol + or -.
For better adjustment repeatability, take care to stop the rotation
of the cam unit when the upper bearing that slides on the profile
4)(Fig. 29) is aligned with one of the adjustment screws 2).
6.7

Combustion air adjustment

The air/fuel synchronisation is carried out by means of a servo-
motor 1)(Fig. 30) that, connected to a variable profile cam 2), op-
erates on the delivery air dampers and, through proper leverage,
on the combustion head and on the gas butterfly valve.
WARNING!
MOVING PARTS
WARNING!
DANGER: CRUSHING OF LIMBS
It is advisable, to reduce the loss and for a wide calibration field,
to adjust the servomotor to the maximum of the output used, the
nearest possible to the maximum opening (130°).
On the gas butterfly valve, fuel step according to the burner out-
put required, with servomotor completely open, is carried out by
the pressure stabilizer placed on the train.
6.8

Air / fuel adjustment

During the calibration of the air / fuel ratio the following adjust-
ments must be performed:
 Air cam:
turn the adjustment screws 2)(Fig. 29) after having loosened
the screws 3).
 Gas cam:
turn the adjustment screws 2)(Fig. 29) after having loosened
the screws 3).
20145860
Start-up, calibration and operation of the burner
Screw or unscrew the preset screw 2) to increase or decrease the
air output so as to adjust it to the corresponding gas output.
After output adjustment (maximum, minimum and
intermediate), it is important to lock all the air ad-
justment screws 2) by the locking screws 3) so as
to avoid possible movements from the position of
CAUTION
air - gas calibration.
20062515
The values in the Tab. K can be useful as reference for a good
fuel calibration.
EN 676
Theoretical max.
GAS
CO 0 % O
2 2
G 20 11.7
G 25 11.5
G 30 14.0
G 31 13.7
26 GB
Air excess
Max. output Max. output
  1.2   1.3
CO % Calibration
2
 = 1.2  = 1.3
9.7 9
9.5 8.8
11.6 10.7
11.4 10.5
Fig. 30
CO
mg/kWh
 1000
 1000
 1000
 1000
Tab. K