GAS VALVE ADJUSTMENT
The boilers leave the factory already set to their minimum and maximum output and therefore do not
need to be set when installed.
Should the settings need to be modified to adapt them to installation requirements it will be necessary
to change fan r.p.m. and reset the CO
Legend
A
M i n i m u m
h e a t
adjustment screw
B
M a x i m u m
h e a t
adjustment screw.
VARYING FAN R.P.M.
-
Set the access code (62) (see page 48)
-
Press MODE
-
Press STEP to display the relative PHASE (F-G)
-
Use the +/- keys to set the desired r.p.m.
-
Press STORE to enter the variation.
value to between 8.8-9%.
2
In the event of gas valve replacement, proceed as follows:
1
2
3
4
5
6
7
When adjustment is over bring PHASE E back from 1 to
0. This parameter variation restores boiler modulation.
d e l i v e r y
d e l i v e r y
Insert a combustion analysis instrument.
Position the switch to SUMMER or WINTER and open
a tap on the hot water circuit.
Wait a few seconds for the boiler to reach max.
power (check the fan r.p.m. on the display).
Adjust the gas flow-rate by acting on screw B until
the CO
value is between 8.8 and 9%.
2
Keep the hot water tap open, select PHASE E and set
parameter "1" to automatically set the boiler to
minimum power.
Adjust the gas flow-rate by acting on screw A until
the CO
value is between 8.8 and 9%.
2
Repeat steps 4-5-6- until combustion values stabilise
when passing from minimum to maximum power and
vice versa.
51