Riello RS 68/EV ULX Installation, Use And Maintenance Instructions page 44

7.2.0.1 Procedure for inserting and adjusting points on
the modulation curve
Nine adjustment/calibration points (P1 ÷ P9) can be inserted in
the flame control for each servomotor, varying their position by
degrees and, consequently, the quantity of air and fuel intro-
duced.
The ignition point P0 is independent of the minimum modulation
value. This means that, in the event of difficulty, it is possible to
switch on the burner at a value other than the modulation mini-
mum (P1).
To access the Parameter mode (group 400) referring to the "Ac-
cess procedure with password" on page 40.
To insert or adjust a point, proceed as follows.
Using the keys "+" and "-" insert/select the curve point you want
and wait for it to flash: this means that the servomotors are now
positioned on the values shown on the display and which corre-
spond to the point previously set.
It is now possible to insert/modify the position by degrees.
The set value does not require confirmation.
WARNING
P
For the fuel servomotor, keep the key "F" pressed (the position
in degrees flashes) and press the keys "+" or "-" to increase or
decrease the value.
P
F
For the air servomotor, keep the key "A" pressed (the position in
degrees flashes) and press the keys "+" or "-" to increase or de-
crease the value.
P
A
To adjust the speed of the inverter (expressed in % and that is 50
Hz = 100 %), keep the buttons "F" and "A" simultaneously
pressed, the percentage position blinks and press buttons "+" or
"-" to increase or decrease the value.
VSD
P
F A
Select another point, or exit this area by pressing the keys "+"
and "-" (ESC) simultaneously.
20205886
Control and display
V h min s
%
s
%
V h min
V h min
%
ESC
7.2.0.2 CALC function
The diagram (Fig. 39) shows how the fuel modulation curve is
modified if the values of point "P5" are changed.
By keeping the "+" key pressed for more than 3 s, the points
from "P6" to "P8" are recalculated.
By keeping the "-" key pressed for more than 3 s, the points
from "P4" to "P2" are recalculated.
100
90
original
80
70
60
50
40
30
20
10
0
P0 P1
The diagram of (Fig. 40) shows the fuel modulation curve when,
after the modification of point "P5", the recalculation of all the oth-
er points is not carried out.
100
90
80
70
60
50
40
30
20
10
0
P0 P1
42 GB
curve
CALC+
CALC-
Recalculation
P2 P3 P4 P5 P6 P7
Point of the curve
P2 P3 P4 P5 P6 P7
Point of the curve
D7908
P8 P9
Fig. 39
D7909
P8 P9
Fig. 40