Ferroli 604, Instructions For Use, Installation And Maintenance

Page: 20 / 24

20
GAS VALVE ADJUSTMENT
Maximum rate adjustment

Switch the boiler on and operate for 10 minutes.

To ensure the boiler operates at maximum rate without modulating
follow the instruction on page 19.

Insert the Flue Gas Analyser (FGA) probe into the test point.

Remove the plastic cover from the gas valve to gain access to the
adjustment screw.

Using a 4mm Allen key adjust as necessary to achieve the correct
CO
2
reading shown in the table below. (Clockwise to decrease, anti-
clockwise to increase)
Minimum rate adjustment
.

Adjust the modulation rate to minimum (0%) as described on page 19.

Allow combustion and flame to stabilise then compare CO
2
reading to
that given in the table below.

To adjust, remove adjustment cover with a flat blade screwdriver.

Using a 40Torx driver adjust CO
2
(Clockwise to increase, anti-
clockwise to decrease) to that given in the table below.

Replace covers.
Emissions Values
CO
2
NO
x
CO CO/CO
2
Minimum
9% < 39 ppm <100 ppm <0.004
Maximum
9.50% < 39 ppm <100 ppm <0.004