
47
Instructions for the installer
CO
2
levels (%)
Gas type
Supply
p r e s s u r e
(mbar)
m i n
(rpm)
Starting
p o w e r
IG
(%)
20
25
37
Ø
Injectors
( m m )
9
9
9
Gas nat. (G20)
Gas nat. (G25)
Propan (G31)
Fan speed
max
(rpm)
1760
1760
1760
6300
6300
6300
50
50
50
m i n
9,1
9,1
10,2
max
9,3
8,6
10,4
MODULEX
440 - 550
660 - 770 - 900
Diaphragm
-
-
-
Follow this procedure also for the other bur-
ners
If the CO
2
percentage is too low, check if the air and smoke
ducts are not obstructed. If they are not obstructed, check if the
burner and/or the exchanger (aluminium sections) are well
cleaned.
Check the C0
2
levels often, especially at low flow rate
INJECTORS – PRESSURES
C)
COMPLETION OF THE BASIC
ADJUSTMENTS
-
Check the C0
2
values at the minimum and maximum outlet
- If necessary make the required adjustments
To ensure correct operation the C0
2
values
have to be adjusted with extreme care
respecting the values indicated in the table.
- Close the sampling test point in the flue outlet terminal
Do not force the end switches of the
adjusting screw.
In case of gas valve replacement or difficult
ignition:
Tighten the maximum adjustment screw “A”
in a clockwise direction until you arrive to
the abutting end, than slacken for 9 turns.
Verify the boiler ignition; if the boiler goes
into lockout slacken the screw “A” again of
one turn, than retry the ignition. If the boiler
goes into lockout again, carry out the above
indicated operations until the boiler is
lighted.
At this point carry out the burner adjustment
as previously indicated.