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ENGLISH

30 S

25 HS

15 H - HS

rpm
rpm
rpm

Natural gas

(G20)

56
51
48

LPG

propane (G31)

52
48
46

Maximum CH fan rpm

Gas valve calibration
• Power the boiler.
• Open the gas tap.
• Turn the function selector to OFF/RESET (digit “--”).
• Pull off the domestic hot water temperature selector knob (7, Fig. 12.1) and

the domestic hot water function selector knob (6, Fig. 12.1).

• Press the combustion analysis button CO.
• Wait for the burner to ignite. “CO” is displayed on the digital display and the

boiler works at maximum heating power. The flue cleaner function remains
active for a maximum of 15 min; if a delivery temperature of 95°C is reached,
the burner switches off. It is re-ignited when this temperature falls below
75°C.

• Remove the plug and insert the fumes analysis probe.
• Turn the max. heating trimmer clockwise until it reaches the maximum fan

rpm (see table).

• Check the CO

value: if the value does not match that indicated in the

table, turn the maximum gas valve adjustment screw.

• Turn the max. heating trimmer anti-clockwise until it reaches the minimum

fan rpm (see table).

• Check the CO

value: if the value does not match that indicated in the

table, turn the minimum gas valve adjustment screw.

• Turn the max. heating trimmer to the maximum heating fan rpm (see table)

12.4 - Boiler configuration
The electronic board contains a series of jumpers (JP4) that can be used
to configure the boiler; access these by loosening the fasteners B (Fig. 7.2)
and removing the control panel cover A (Fig. 7.2) after turning off the main
switch.
JUMPER IN POSITION 1:
pre-selection of the most suitable heating temperature adjustment field
according to the type of system.
Jumper not inserted - case A
Standard system 40-80°C
Jumper inserted - case B
Floor system 20-45°C.
The boiler has been factory-configured for standard systems.

For S models (Fig. 12.14):
JUMPER IN POSITION 2: (unused)
JUMPER IN POSITION 3: (unused)
JUMPER IN POSITION 4: (unused)
JUMPER IN POSITION 5: COMBINED
JUMPER IN POSITION 6: (unused)

For H-HS models (Fig. 12.15):
JUMPER IN POSITION 2: (water tank with probe)
JUMPER IN POSITION 3: (water tank with thermostat)
JUMPER IN POSITION 4: (unused)
JUMPER IN POSITION 5: (unused)
JUMPER IN POSITION 6: (unused)

The boiler HS is supplied standard with the jumper in position 2 (water
tank with probe); if you wish to use an external water tank with thermostat,
move this jumper from position 2 to position 3 (case C, Fig. 12.15).

ATTENTION
If the boiler is not connected to an external water tank, put the jumper in
position 3.

13 - SETTING THE THERMOREGULATION

Heat adjustment only works with the external probe connected, therefore,
after installation, connect the external probe to the relative connections on
the boiler terminal board.
This enables the THERMOREGULATION function.

Selecting the offset heating curve (Fig. 13.1)
The offset heating curve maintains a theoretical ambient temperature of 20°C
at external temperatures ranging from +20°C to -20°C. The choice of the curve
depends on the rated minimum external temperature (on the geographical
area, therefore) and the rated delivery temperature (on the type of system,
therefore) and must be carefully calculated by the fitter using the following
formula:

Tshift = 30°C standard systems

25°C floor systems

If the calculation generates an intermediate value between two curves, choose
the nearest offset heating curve to that value.
E.g.: if the value obtained by the calculation is 1.3, it lies between curve 1 and
curve 1.5. In this case, select the nearest curve, i.e.: 1.5.
Select KT by turning the trimmer located under the domestic hot water tempe-
rature knob (A, Fig. 13.2).
The settable values of KT are:
• standard system: 1,0-1,5-2,0-2,5-3,0
• floor system: 0,2-0,4-0,6-0,8
Type of heat request
If an ambient thermostat is connected to the boiler (parameter 51 = 0 -
manufacturer’s default setting) (Fig. 13.3)
The ambient thermostat makes a heat request when its contact closes, while
it stops it when its contact opens. Though delivery temperature is automatically
calculated by the boiler, the user may manually override it. By modifying
HEATING on the user interface (C, Fig. 13.2), the HEATING SET POINT will
no longer be available but just a value that can be set from +5 to -5°C as
required. Modifications to this value do not directly change delivery tempera-
ture but affect the calculation made to automatically determine its value by
modifying the reference temperature of the system (0 = 20°C).

If a programmable timer is connected to the boiler, set parameter 51 =
1 (this parameter can only be modified from the remote control unit)
(Fig. 13.4)
When the contact is closed, the heat request is made by the delivery probe on
the basis of the external temperature in order to maintain the rated ambient
temperature at the DAY level (20 °C). When the contact opens, it does not
stop the heat request but reduces (parallel shift) the temperature curve to the
NIGHT level (16 °C).
This activates the night mode.

Though delivery temperature is automatically calculated by the boiler, the
user may manually override it.
By modifying HEATING on the user interface (C, fig. 13.2), the HEATING
SET POINT will no longer be available but just a value that can be set from
+5 to -5°C as required.
Modifications to this value do not directly change delivery temperature but
affect the calculation made to automatically determine its value by modifying
the reference temperature of the system (0 = 20°C for DAY level; 16°C for
NIGHT level).

14 - ADJUSTMENTS

The boiler has already been factory-adjusted by the manufacturer. If a new
adjustment is required, for example, after extraordinary maintenance, replacing
the gas valve or converting from natural gas to LPG, proceed as follows.

Maximum and minimum power, maximum heating and slow start must
be adjusted in the indicated sequence by qualified staff.

• Power the boiler.
• Turn the function selector to OFF/RESET (digit “--”).
• Pull off the 3 function buttons (domestic hot water A, command B and

heating C, Fig. 13.2).

• Turn the trimmers in the following sequence and adjust them until their

values correspond with those indicated in the table:
1. Max (maximum fan rpm)
2. Min (minimum fan rpm)
3. Max risc. (maximum heating fan rpm)
4. Slow start LA (set to 3.7=3700 rpm)

Calibration does not switch on the boiler.
When the trimmers are turned the value expressed in thousands (e.g..
2.5=2500 rpm) is indicated on the 2-digit display).
Slow start LA must be adjusted after calibrating all the other trimmers.

%
%
%

Natural gas

(G20)

8,5
8,5
9,0

LPG

propane (G31)

10,0
10,0
10,0

max

30 S

25 HS

15 H - HS

30 S