TECHNICIAN
INSTALLER
USER
27
the feed to the modulating coil. Boiler minimum heat
output pressure must not be adjusted to below the
values given in the tables on page 30-31 accord-
ing to the type of gas.
• Adjustment of boiler min. heat output, to be carried
out ONLY for boilers with output of 27,000 kcal/h (see
fig. page 28). Adjust minimum heat output for room
heating, by operating the trimmer (11 page 28) lo-
cated on the boiler modulation electronic card, as
follows:
- close the domestic hot water cock and turn the
switch (5 page 21) to pos. ( );
- within 1 minute of boiler lighting, adjust minimum
heat output by turning the trimmer (11 page 28) on
the modulation card, keeping to the values given
in the tables on page 30-31 for boiler variable heat
output. Turn the trimmer clockwise to increase the
pressure and counterclockwise to decrease.
• Adjustment of heat output, to be made for all boiler
models with outputs from 21,000 to 27,000 kcal/h
(see fig. page 28). To adjust maximum heat output
for room heating, operate the trimmer (12 page 28)
located on the boiler modulation electronic card,
as follows:
- close the domestic hot water cock and turn the
switch (5 page 21) to pos. ( );
- set the heating control selector (1 page 20) to maxi-
mum temperature to prevent modulation;
- adjust maximum heating output by turning the trim-
mer (12 page 28) on the modulation card, keeping
to the values given in the tables on page 30-31 for
boiler variable heat output. Turn the trimmer clock-
wise to increase the pressure and counterclockwise
to decrease.
N.B.: to adjust the gas valve, remove the plastic cap
(5), after adjusting refit the cap.
N.B.: the Eolo Maior @ boiler is fitted with electronic
modulation that adapts boiler power to actual room
heating requirements. Therefore the boiler operates
normally in a variable gas pressure range between
the minimum and maximum heating power accord-
ing to the system thermal load.
N.B.: the Eolo Maior @ boiler is produced and set to
rated power during heating, however, about 15 min-
utes are required to reach rated heating power; since
boiler models with outputs from 21,000 to 24,000 kcal/
h are factory-set, the minimum heating trimmer (11)
does not have to adjusted.
3.7 Eolo Maior @ boiler slow ignition adjust-
ment.
After setting the minimum and maximum heating
settings for the unit, the first slow ignition step can
be set for the gas valve. To carry out this adjustment
operate the Trimmer (10 page 28) located on the
boiler electronic modulation card. Turn it clockwise
to increase pressure and counterclockwise to de-
crease. To obtain slow or gradual inter-ignition of the
burner, we recommend setting the first step for slow
ignition at 25 mm H
2
0 for boilers operating with natu-
ral gas and 60 mm H
2
O for boilers operating with
LPG.
N.B.: do not go below the boiler minimum heat out-
put when setting the slow ignition.
3.8 Permanent reduction in timing.
The “Eolo Maior @” boiler is equipped with an elec-
tronic timer which prevents too frequent burner light-
ing in the heating phase. The boiler comes standard
with the timer adjusted to 3 minutes. To bring the
timer to 30 seconds, remove the jumper (14) (see
page 28).
3.9 Pump antiblock function.
During the “Summer” phase the boiler is equipped
with a function that starts the pump at least once
every 24 hours for the duration of 2.5 minutes in or-
der to reduce the risk of the pump becoming blocked
due to prolonged inactivity.
3.10 Radiator antifreeze function.
During the “Winter” phase the boiler is equipped with
a function that starts the pump at least once every
3 hours for the duration of 2.5 minutes.
If the system’s return water is at a temperature of
below 4°C, the boiler starts up until reaching 42°C.
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