Ferroli Modena 102 Installation, Servicing And User Instructions Manual page 23

• Chec that the domestic hot water flow and T correspond to the table.
measurements. Temperature should be measured using thermometers as near as possible to the boiler,
in mind the heat loss from the pipes.
• Chec that the gas valve modulates correctly both during the central heating phase and the domestic
hot water production phase.
• To determine 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
Finding (page 32).
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 xed pressure values, minimum and maximum,
which must be as shown in the table (pages 5), whichever type of gas is used.
ote Because correct minimum and maximum pressures are critical to the efficient operation
of the boiler it is ESSENTIAL that the following adjustments are carried out by COMPETENT
personnel ONLY.
5.0 Adjusting minimum and ma imum pressure
Connect suitable pressure gauge to burner test point
downstream of the gas valve.
isconnect the pressure compensation tube
emove the protective cap
Adjust potentiometre
(cloc wise).
Operate boiler for central heating
Adjust minimum pressure by rotating screw
to reduce pressure and anticloc wise to increase pres
sure.
If it is not possible to achieve the right pressure adjust
minimum pressure by potentiometer 5
Adjust potentiometre
Adjust max pressure by rotating screw
increase pressure and anticloc wise 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 .
A = Gas nlet test po nt
= Gas o tlet test po nt
= ote t on ap
= n p ess e a
= a p ess e a
= alan n t e
.
(on the main board) at minimum
at maximum (anticloc wise)
.
ne p ess e
st n s e
st n s e
ata (page 5). Adjustment (page 23) and Fault
one we 105
.
cloc wise
, cloc wise to
.
F
o not rely on empirical
gas a e
C
E B A D