Ferroli F24 Installation, Service And User Instructions Manual page 27

• Check that the gas valve modulates correctly both during the central heating phase and the domestic
hot water production phase.
• Determine the combustion effi ciency and the composition of the fl ue gases (refer to 6.04)
• If any of the above are not correct refer to Technical Data (page 5). Adjustment (refer to 5) and Fault
fi nding (page 39).
5.01 Adjusting the pressure and fl ow rate to the main burner
This boiler operates on the fl ame modulation principle. It has two fi ed pressure values minimum and ma imum
which must be as shown in the table (pages 5) whichever type of gas is used.
ote ecause correct minimum and ma imum pressures are critical to the efficient operation
of the boiler it is
personnel .
5.0 Adjusting minimum and ma imum pressure
one we 105 gas a e
Connect suitable pressure gauge to burner test
point downstream of the gas valve.
Disconnect the pressure compensation tube
emove the protective cap
Adjust potentiometre
minimum (clockwise).
perate boiler for central heating
Adjust minimum pressure by rotating screw
clockwise toreduce pressure and anticlockwise
to increase pressure.
Adjust potentiometre
(anticlockwise)
Adjust ma pressure by rotating screw
clockwise to increase pressure and anticlockwise
to reduce pressure.
econnect the pressure compensation tube
eplace protective cap
a imum inimum possib e gas pressures are
now set. ange ating the entra heating is not
ne essar see paragraph 5.0 .
e
A as inlet test point
as outlet test point
rotection cup
in. pressure adjusting screw
a . pressure adjusting screw
alancing tube
TIA that the following adjustments are carried out by C
.
.
(on the main board) at
at ma imum
.
.
C
F
E B A
T T
D
Fig.