Westen Star Digit Series Instruction Manual

High efficiency wall-mounted gas-fired boilers
Centrale murale pe gaz cu randament ridicat
Nagy hatásfokú falra szerelhető gáztüzelésű kazánok
Высокоэффективные настенные газовые котлы
Υψηλής απόδοσης λέβητες αερίου επίτοιχης εγκατάστασης
Instructions for the User and the Installer
Instrucţiuni pentru instalator şi pentru utilizator
Felszerelési és használati utasítás
Руководство по установке и эксплуатации
Οδηγίες Εγκαταστάτη και Χρήστη

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2INSTRUCTIONS PERTAINING TO THE USERBAXI - 925.529.1
Dear Customer,
We are sure your new boiler will comply with all your requirements.
Purchasing one of the BAXI products satises your expectations: good functioning, simpli-
city and ease of use.
Do not dispose of this booklet without reading it: you can nd here some very useful infor-
mation, which will help you to run your boiler correctly and efciently.
BAXI boilers bear the CE mark in compliance with the basic requirements as laid
down in the following Directives:
- Gas Directive 90/396/CEE
- Performance Directive 92/42/CEE
- Electromagnetic Compatibility Directive 89/336/CEE
- Low Voltage Directive 73/23/CEE
Do not leave any parts of the packaging (plastic bags, polystyrene, etc.) within children’s reach as they are a
potential source of danger.
1. Instructions prior to installation 3
2. Instructions prior to commissioning 3
3. Commissioning of the boiler 4
4. Central Heating (CH) and Domestic Hot Water (D.H.W.) temperature adjustment 5
5. Filling the boiler 6
6. Turning off the boiler 6
7. Gas change 6
8. Prolonged standstill of the system. Frost protection 6
9. Error messages and table of faults 7
10. Servicing instructions 7
11. General information 8
12. Instructions prior to installation 8
13. Boiler installation 9
14. Boiler size 9
15. Installation of ue and air ducts 10
16. Connecting the mains supply 14
17. Fitting a room thermostat 15
18. Gas change modalities 15
19. Information display 17
20. Parameters setting 19
21. Control and operation devices 20
22. Positioning of the ignition and ame sensing electrode 21
23. Check of combustion parameters 21
24. Output / pump head performances 21
25. Connection of the external probe 22
26. Connecting an external hot water tank and 3-way valve motor 23
27. How to purge the DHW system from limestone deposits 25
28. How to disassemble the DHW heat exchanger 25
29. Cleaning the cold water lter 25
30. Boiler schematic 26-28
31. Illustrated wiring diagram 29-31
32. Technical data 32
CONTENTS
ISTRUCTIONS PERTAINING TO THE USER
ISTRUCTIONS PERTAINING TO THE INSTALLER

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3INSTRUCTIONS PERTAINING TO THE USERBAXI - 925.529.1
This boiler is designed to heat water at a lower than boiling temperature at atmospheric pressure. The boiler must be
connected to a central heating system and to a domestic hot water supply system in compliance with its performances
and output power.
Have the boiler installed by a Qualied Service Engineer and ensure the following operations are accomplished:
a) careful checking that the boiler is t for operation with the type of gas available. For more details see the notice on the
packaging and the label on the appliance itself.
b) careful checking that the ue terminal draft is appropriate; that the terminal is not obstructed and that no other appliance
exhaust gases are expelled through the same ue duct, unless the ue is especially designed to collect the exhaust gas
coming from more than one appliance, in conformity with the laws and regulations in force.
c) careful checking that, in case the ue has been connected to pre-existing ue ducts, thorough cleaning has been carried
out in that residual combustion products may come off during operation of the boiler and obstruct the ue duct.
d) to ensure correct operation of the appliance and avoid invalidating the guarantee, observe the following precautions:
1. Hot water circuit:
1.1. If the water hardness is greater than 20 °F (1 °F = 10 mg calcium carbonate per litre of water) a polyphosphate or
comparable treatment system responding to current regulations.
1.2. Domestic Hot Water circuit must be thoroughly ushed after the installation of the appliance and before its use.
2. Heating circuit
2.1. new system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out thoroughly to eliminate
residual thread-cutting swarf, solder and solvents if any, using suitable proprietary products.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non alkaline. The
recommended products for cleaning are:
SENTINEL X300 or X400 and FERNOX heating circuit restore. To use this product proceeding strictly in accordance
with the maker’s directions.
2.2. existing system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out to remove sludge
and contaminants, using suitable proprietary products as described in section 2.1.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-alkaline such
as SENTINEL X100 and FERNOX heating circuit protective. To use this product proceeding strictly in accordance
with the maker’s directions.
Remember that the presence of foreign matter in the heating system can adversely affect the operation of the
boiler (e.g. overheating and noisy operation of the heat exchanger).
Failure to observe the above will render the guarantee null and void.
1. INSTRUCTIONS PRIOR TO INSTALLATION
Initial lighting of the boiler must be carried out by a licensed technician. Ensure the following operations are carried out:
a) compliance of boiler parameters with (electricity, water, gas) supply systems settings.
b) compliance of installation with the laws and regulations in force.
c) appropriate connection to the power supply and grounding of the appliance.
Failure to observe the above will render the guarantee null and void.
Prior to commissioning remove the protective plastic coating from the unit. Do not use any tools or abrasive detergents
as you may spoil the painted surfaces.
2. INSTRUCTIONS PRIOR TO COMMISSIONING

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4INSTRUCTIONS PERTAINING TO THE USERBAXI - 925.529.1
3. COMMISSIONING OF THE BOILER
Figure 1
To correctly light the boiler proceed as follows:
• Provide power supply to the boiler.
• open the gas cock;
• press the button, for at least two seconds, to set the operating boiler mode (see section 3.2)
Note: if summertime mode is setting, the boiler will light only during a D.H.W. demand .
• To adjust the CH and D.H.W. temperature, press the +/- respective buttons as described in section 4.
Warning: During initial lighting, until the air contained in the gas pipes is not released, the burner may fail to light imme-
diately and that may cause a ‘blockage’ of the boiler. Under such circumstances we recommend you to repeat the ignition
procedure until the gas is delivered to the burner, and press Rbutton for at least 2 seconds.
DISPLAY LEGEND:
Operating in
Central Heating mode (CH)
Generic ERROR
Water pressure LOW
Numeric signalling
(temperature, error codes, etc)
RESET
FUNCTION ACTIVATED
(see Section 4)
Flame present - power level = 25%
(burner switch on)
Boiler power levels
(3 power levels)
Operating in Domestic
Hot Water mode (D.H.W.)
BUTTONS LEGEND
D.H.W. temperature regulation
Central Heating (CH) temperature regulation
RESET
ECO - COMFORT
0609_2301
MODE BUTTON
(see section 3.2)

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5INSTRUCTIONS PERTAINING TO THE USERBAXI - 925.529.1
There are 4 power levels displayed during boiler operation
regarding the gas boiler modulation, as shown in gure 2:
4. CENTRAL HEATING (CH) AND DOMESTIC HOT WATER (D.H.W.) TEMPERATURE ADJUSTMENT
The CH ( ) and D.H.W. ( ) temperature adjustment are carried out by pressing the relative +/- buttons (gure 1).
When the burner is lighted the display shows the symbol ( ).
CENTRAL HEATING (CH)
The system must be equipped with a room thermostat (see the relevant regulations) to control the temperature in the rooms.
During a CH mode, the display shows a CH ( ) blinking symbol and the CH ow temperature value (°C).
DOMESTIC HOT WATER (D.H.W.)
During a D.H.W. request, the display shows a D.H.W. ( ) blinking symbol and the D.H.W. ow temperature value (°C).
There are two different setpoint which can be quickly set: ECO and COMFORT.
To adjust the temperature values, proceed as follows:
ECO
The ECO temperature setpoint allows the user to quickly set the relative domestic hot water temperature pressing the P
button. In eco function the display reads out “eco”. To set the ECO temperature setpoint press the +/- buttons.
COMFORT
The COMFORT temperature setpoint allow the user to quickly set the relative domestic hot water temperature pressing
the Pbutton. To set the COMFORT temperature setpoint press the +/- buttons.
Note: during a D.H.W. demand, with a D.H.W. storage tank connected to the gas boiler, the display shows the ( )
symbol and the ow tank temperature value.
3.1 SYMBOL MEANING
0605_1101
Figure 2
The gas boiler modes are: OFF - SUMMER ( ) - WINTER ( ) - ONLY HEATING ( ).
The mode operation can be set pressing , for about 2 seconds, the button once a time.
3.2 OPERATING BOILER MODE

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6INSTRUCTIONS PERTAINING TO THE USERBAXI - 925.529.1
IMPORTANT: Regularly check that the pressure displayed by the pressostat (gure 3) is 0.7 to 1.5 bar, with boiler not
operating. In case of overpressure, open the boiler drain valve (Figure 3).
In case the pressure is lower open the boiler lling tap (Figure 3).
We recommend you open the tap very slowly in order to let off the air.
During this operation, the gas boiler must be in “OFF” mode (press the button - See section 3.2).
NOTE: In case pressure drops occur frequently have the boiler checked by a Qualified Service Engineer.
5. FILLING THE BOILER
The electric supply to the boiler must be removed in order to switch it OFF.
With the gas boiler in “OFF” mode ( section 3.2 ), the display reads out “OFF” but the main board is still supplied.
6. TURNING OFF THE BOILER
7. GAS CHANGE
These boilers set for natural gas can be converted to work with LPG.
Any gas change must be effected by a Qualied Service Engineer.
We recommend you avoid draining the whole system as water replacements engender purposeless and harmful limestone
deposits inside the boiler and on the heating elements. In case the boiler is not operated during wintertime and is therefore
exposed to danger of frost we suggest you add some specic-purpose anti-freeze to the water contained in the system
(e.g.: propylene glycole coupled with corrosion and scaling inhibitors).
The electronic management of boilers includes a “frost protection” function in the central heating system which operates
the burner to reach a heating ow temperature of 30° C when the system heating ow temperature drops below 5°C.
The frost protection function is enabled if:
* electrical supply to the boiler is on;
* the gas service cock is open;
* the system pressure is as required;
* the boiler is not blocked.
8. PROLONGED STANDSTILL OF THE SYSTEM. FROST PROTECTION
Figure 3a
0603_1302/CG_1791
Filling tap
Drain point
Manometer
Figure 3b
0603_1303/CG_1791
240i - 240 Fi - 310 Fi 1.240i - 1.240 Fi - 1.310 Fi
Boiler filling tap

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7INSTRUCTIONS PERTAINING TO THE USERBAXI - 925.529.1
9. ERROR MESSAGES AND TABLE OF FAULTS
To maintain efcient and safe operation of your boiler have it checked by a Qualied Service Engineer at the end of every
operating period.
Careful servicing will ensure economical operation of the system.
Do not clean the outer casing of the appliance with abrasive, aggressive and/or easily ammable cleaners (i.e.: gasoline,
alcohol, and so on). Always isolate the electrical supply to the appliance before cleaning it (see section 6).
10. SERVICING INSTRUCTIONS
ERROR
CODE
E01
E02
E03
E05
E06
E10
E25
E35
Description of FAULTS
Gas supply fault
Safety thermostat sensor tripped
Flue thermostat sensor tripped / Flue pressure switch
tripped
Central heating NTC sensor fault
Domestic Hot Water NTC sensor fault
Water pressure LOW
Boiler max temperature exceeded
(probable pump jammed)
Fault ame (parasitic ame)
CORRECTIVE ACTION
Press the button (gure 1) for at least 2 seconds. If this fault
persist, call an authorised Service centre.
Press the button (gure 1) for at least 2 seconds. If this fault
persist, call an authorised Service centre.
Call an authorised Service centre.
Call an authorised Service centre.
Call an authorised Service centre.
Check that the pressure in the system is as specied. See
Section 5. If this fault persist, call an authorised Service
centre.
Call an authorized Service centre.
Press the button (gure 1) for at least 2 seconds. If this fault
persists, call an authorized Service centre
Figure 4
0605_1106
Note: when an anomaly occurs, the display background ashes with the error code.
The anomalies are carried out on the display with an error code (e.g. E01).
The anomalies which can be reset by the user are shown with the symbol (e.g. gure 4).
The anomalies which cannot be reset are carried out with the symbol (e.g. gure 4.1).
To RESET the gas boiler, press button for at least 2 seconds.
Figure 4.1
0605_1107

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8INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
This boiler is designed to heat water at a lower than boiling temperature at atmospheric pressure. The boiler must be
connected to a central heating system and to a domestic hot water supply system in compliance with its performances
and output power.
Have the boiler installed by a Qualied Service Engineer and ensure the following operations are accomplished:
a) careful checking that the boiler is t for operation with the type of gas available. For more details see the notice on the
packaging and the label on the appliance itself.
b) careful checking that the ue terminal draft is appropriate; that the terminal is not obstructed and that no other appliance
exhaust gases are expelled through the same ue duct, unless the ue is especially designed to collect the exhaust gas
coming from more than one appliance, in conformity with the laws and regulations in force.
c) careful checking that, in case the ue has been connected to pre-existing ue ducts, thorough cleaning has been carried
out in that residual combustion products may come off during operation of the boiler and obstruct the ue duct.
To ensure correct operation of the appliance and avoid invalidating the guarantee, observe the following precautions:
1. Hot water circuit:
1.1. If the water hardness is greater than 20 °F (1 °F = 10 mg calcium carbonate per litre of water) a polyphosphate or
comparable treatment system responding to current regulations.
1.2. Domestic Hot Water circuit must be thoroughly ushed after the installation of the appliance and before its use.
2. Heating circuit
2.1. new system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out thoroughly to eliminate
residual thread-cutting swarf, solder and solvents if any, using suitable proprietary products.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non alkaline. The
recommended products for cleaning are:
SENTINEL X300 or X400 and FERNOX heating circuit restore. To use this product proceeding strictly in accordance
with the maker’s directions.
2.2. existing system
Before proceeding with installation of the boiler, the system must be cleaned and ushed out to remove sludge
and contaminants, using suitable proprietary products as described in 2.1.
To avoid damaging metal, plastic and rubber parts, use only neutral cleaners, i.e. non-acid and non-alkaline such
as SENTINEL X100 and FERNOX heating circuit protective. To use this product proceeding strictly in accordance
with the maker’s directions.
Remember that the presence of foreign matter in the heating system can adversely affect the operation of the
boiler (e.g. overheating and noisy operation of the heat exchanger).
Failure to observe the above will render the guarantee null and void.
The following remarks and instructions are addressed to Service Engineers to help them carry out a faultless installation. In-
structions regarding lighting and operation of the boiler are contained in the ‘Instructions pertaining to the user’ section.
Note that installation, maintenance and operation of the domestic gas appliances must be performed exclusively by quali-
ed personnel in compliance with current standards.
Please note the following:
* This boiler can be connected to any type of double- or single feeding pipe convector plates, radiators, thermoconvectors.
Design the system sections as usual though taking into account the available output / pump head performances, as
shown in section 24.
* Do not leave any packaging components (plastic bags, polystyrene, etc.) within children’s reach as they are a potential
source of danger.
* Initial lighting of the boiler must be effected by a Qualied Service Engineer.
Failure to observe the above will render the guarantee null and void.
11. GENERAL INFORMATION
12. INSTRUCTIONS PRIOR TO INSTALLATION

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9INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
13. BOILER INSTALLATION
Decide upon the boiler location, then tape the template on the wall. Connect the pipework to the gas and water inlets
prearranged on the template lower bar. We suggest you t two G3/4 stop cocks (available on demand) on the central
heating system ow and return pipework; the cocks will allow to carry out important operations on the system without
draining it completely. If you are either installing the boiler on a pre-existent system or substituting it, we suggest you also
t settling tank on the system return pipework and under the boiler to collect the deposits and scaling which may remain
and be circulated in the system after the purge.
When the boiler is xed on the template connect the ue and air ducts (ttings supplied by the manufacturer) according
to the instructions given in the following sections.
When installing the 240 i - 1.240 i model (boiler with natural draught), make the connection to the ue using a metal pipe
which will provide resistance over time to the normal mechanical stresses, heat and the effects of the combustion products
and any condensation they form.
14. BOILER SIZE
Figure 6
240 i - 1.240 i 240 Fi - 310 Fi - 1.240 Fi - 1.310 Fi
minimo
0606_2602
0606_2603
Figure 5
= BOILER WIDTH 450 =
BOILER CONNECTION POINTS
BOILER HEIGHT 780
: G3/4 heating ow / return
: G1/2 domestic hot water inlet / outlet
: G3/4 gas inlet to the boiler
0512_0504/CG1769
0512_0505/CG1769
0512_0503/CG1769
: G3/4 heating ow / return
: G1/2 domestic hot water inlet - G3/4 outlet
: G3/4 gas inlet to the boiler
240 Fi - 240 i - 310 Fi1.240 i - 1.240 Fi - 1.310 Fi

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10 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
15. INSTALLATION OF FLUE AND AIR DUCTS
Models 240 Fi - 310 Fi - 1.240 Fi - 1.310 Fi
We guarantee ease and exibility of installation for a gas-
red forced draught boiler thanks to the ttings and xtures
supplied (described below).
The boiler is especially designed for connection to an
exhaust ue / air ducting, with either coaxial, vertical or
horizontal terminal. By means of a splitting kit a two-pipe
system may also be installed.
Exclusively install fittings supplied by the manufac-
turer.
Figure 7
0503_0905/CG1638
Figure 8
… COAXIAL FLUE - AIR DUCT (CONCENTRIC)
This type of duct allows to disengage exhaust gases and to draw combustion air both outside the building and in case a
LAS ue is tted.
The 90° coaxial bend allows to connect the boiler to a ue-air duct in any direction as it can rotate by 360°. It can moreover
be used as a supplementary bend and be coupled with a coaxial duct or a 45° bend.
0511_2701/CG1750
If the ue outlet is placed outside, the ue-air ducting must
protrude at least 18mm out of the wall to allow alluminium wea-
thering tile to be tted and sealed to avoid water leakages.
Ensure a minimum downward slope of 1 cm towards the
outside per each metre of duct length.
•A 90° bend reduces the total duct length by 1 metre.
•A 45° bend reduces the total duct length by 0.5 me-
tre.
Securing clamp
Concentric outlet
A
B
(*) The first 90° bend is not included in the maximum available length.
Boiler
model
240 Fi
1.240 Fi
310 Fi
1.310 Fi
Horizontal (*)
0 ÷ 1
1 ÷ 2
2 ÷ 5
0 ÷ 1
1 ÷ 2
2 ÷ 4
Vertical
0 ÷ 1
1 ÷ 2
2 ÷ 4
0 ÷ 1
1 ÷ 2
2 ÷ 4
Length (m)
Air suction
RESTRICTOR
B
Yes
No
No
Yes
No
Flue
RESTRICTOR
A
Yes
No
No
Yes
No
No

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11 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
15.1 HORIZONTAL FLUE TERMINAL INSTALLATION OPTIONS
15.2 LAS FLUE DUCT INSTALLATION OPTIONS
15.3 VERTICAL FLUE TERMINAL INSTALLATION OPTIONS
This type of installation can be carried out both on a at or pitched roof by tting a terminal, an appropriate weathering
tile and sleeve, (supplementary ttings supplied on demand).
0611_2101
0512_2001
0512_2002
For detailed instructions concerning the installation of ttings refer to the technical data accompanying the ttings.
L max = 5 m 240-1.240 Fi Ø 60/100 mm - 9m240-1.240 Fi Ø 80/120 mm
L max = 4 m 310-1.310 Fi Ø 60/100 mm - 8m240-1.240 Fi Ø 80/120 mm
L max = 4 m 240-1.240 Fi Ø 60/100 mm - 8m240-1.240 Fi Ø 80/120 mm
L max = 3 m 310-1.310 Fi Ø 60/100 mm - 7m240-1.240 Fi Ø 80/120 mm
L max = 5 m 240-1.240 Fi Ø 60/100 mm - 9m240-1.240 Fi Ø 80/120 mm
L max = 4 m 310-1.310 Fi Ø 60/100 mm - 8m240-1.240 Fi Ø 80/120 mm
L max = 2 m Ø 60/100 mm
8 m Ø 80/120 mm
L max =
4 m Ø 60/100 mm
10 m Ø 80/120 mm
L max =
3mØ 60/100 mm
9 m Ø 80/120 mm

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12 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
… SEPARATED FLUE-AIR DUCTING
This type of ducting allows to disengage exhaust ue gases both outside the building and into single ue ducts.
Comburant air may be drawn in at a different site from where the ue terminal is located.
The splitting kit consists of a ue duct adaptor (100/80) and of an air duct adaptor.
For the air duct adaptor t the screws and seals previously removed from the cap.
The restrictor must be removed in the following cases
Figure 9
The 90° bend allows to connect the boiler to ue-air ducting regardless of direction as it can be rotated by 360°. It can
moreover be used as a supplementary bend to be coupled with the duct or with a 45° bend.
• A 90° bend reduces the total duct length by 0.5 metre.
• A 45° bend reduces the total duct length by 0.25 metre.
0604/2301/CG1776
(*) The first 90° bend is not included in the maximum available length.
Split flue air control adjustment
The adjustment of this control is required
to optimise performance and combustion
parameters. The air suction coupling can
be rotated to adjust excess air according
to the total length of the ue and intake
ducts for the combustion air.
Turn this control to increase or decrease
excess combustion air (gure 9):
To improve optimisation a combu-
stion product analyser can be used to
measure the CO2contents of the ue
at maximum heat output, gradually
adjusting air to obtain the CO2reading
in the table below, if the analysis shows
a lower value.
To properly install this device, also refer
to the technical data accompanying the
tting.
Flue duct adaptor
Seal
Air suction coupling
adjust
Index
Opening
Boiler
model
240 Fi
1.240 Fi
310 Fi
1.310 Fi
Horizontal(*)
0 ÷ 4
4 ÷ 15
15 ÷ 25
25 ÷ 40
0 ÷ 2
2 ÷ 8
8 ÷ 25
vertical
0 ÷ 4
4 ÷ 15
-
-
0 ÷ 2
2 ÷ 8
8 ÷ 25
(L1+L2) Air suction
copupling
position
3
1
-
-
1
2
3
Flue
RESTRICTOR
A
Yes
No
No
CO2 %
G20
6,4
7,4
G31
7,3
8,4

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13 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
0503_2201/CG1643
15.5 SEPARATED HORIZONTAL FLUE TERMINALS INSTALLATION OPTIONS
IMPORTANT: Ensure a minimum downward slope of 1 cm toward the outside per each metre of duct length.
In the event of installation of the condensate collection kit, the angle of the drain duct must be directed towards the
boiler.
NB: For C52 types, terminals for combustion air suction and combustion product extraction must never be tted on op-
posite walls of the building.
The maximum length of the suction duct must be 10 metres. If the ue duct exceeds 6 m, the condensate collection kit
(supplied as an accessory) must be tted close to the boiler.
15.4 SPLIT FLUE OVERALL DIMENSIONS
0504_1806/CG_1794
0503_0911/CG1644
15.6 SEPARATED VERTICAL FLUE TERMINALS INSTALLATION OPTIONS
(L1 + L2) max = 40 m 240 Fi - 1.240 Fi
(L1 + L2) max = 25 m 310 Fi - 1.310 Fi
L max = 10 m 240 Fi - 1.240 Fi
L max = 8 m 310 Fi - 1.310 Fi
L max = 15 m 240 Fi - 1.240 Fi
L max = 12 m 310 Fi - 1.310 Fi
L max = 14 m 240 Fi - 1.240 Fi
L max = 10 m 310 Fi - 1.310 Fi

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14 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
16. CONNECTING THE MAINS SUPPLY
Electrical safety of the appliance is only guaranteed by correct grounding, in compliance with the applicable laws and
regulations.
Connect the boiler to a 230V monophase + ground power supply by means of the three-pin cable supplied with it and
make sure you connect polarities correctly.
Use a double-pole switch with a contact separation of at least 3mm in both poles.
In case you replace the power supply cable t a HAR H05 VV-F’ 3x0.75mm2cable with an 8mm diameter max.
…Access to the power supply terminal block
• isolate the electrical supply to the boiler by the double-pole switch;
• unscrew the two screws securing the control board to the boiler;
• rotate the control board;
• unscrew the lid and gain access to the wiring (Figure 10).
Figure 10
0512_0508/CG1770
The 2A fast-blowing fuses are incorporated in the
power supply terminal block (to check or replace
the fuse, pull out the black fuse carrier).
IMPORTANT: be sure to connect polarities cor-
rectly L(LIVE) - N(NEUTRAL).
(L) = Live (brown)
(N) = Neutral (blue)
( ) = Ground (yellow/green)
(1) (2) = Room thermostat terminal
Important: if tting a single exhaust ue duct, ensure it is adequately insulated (e.g.: with glass wool) wherever the duct
passes through building walls.
For detailed instructions concerning the installation of ttings refer to the technical data accompanying the ttings.

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15 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
A Qualied Service Engineer may adapt this boiler to operate with natural gas (G. 20) or with liquid gas (G. 31).
The procedure for calibrating the pressure regulator may vary according to the type of gas valve tted (HONEYWELL or
SIT; see gure 11).
18. GAS CHANGE MODALITIES
Figure 11
SIT valve
mod. SIGMA 845
Honeywell valve
mod. VK 4105 M
9912221500
Pc
Pb
Pa
0207_0406
Carry out the following operations in the given sequence:
A) substitute the main burner injectors;
B) change the modulator voltage;
C) proceed with a new max. and min. setting of the
pressure adjusting device.
A) Substitute the main burner injectors
• carefully pull the main burner off its seat;
• substitute the main burner injectors and make sure you
tighten them to avoid leakage. The nozzle diameters are
specied in table 1.
B) Change the modulator voltage
• setting F02 parameter according to the gas used as de-
scribed in section 20.
C) Pressure adjusting device setting
• connect the positive pressure test point of a differential
(possibly water-operated) manometer to the gas valve
pressure test point (Pb) (Figure 11); connect, for sealed
chamber models only, the negative pressure test point of
the manometer to a “T” tting in order to join the boiler
adjusting outlet, the gas valve adjusting outlet (Pc) and the
manometer. (The same measurement can be carried out
by connecting the manometer to the pressure test point
(Pb) after removing the sealed chamber front panel);
If you measure the pressure of burners in a different way
you may obtain an altered result in that the low pressure
created in the sealed chamber by the fan would not be
taken into account.
C1) Adjustment to nominal heat output
• open the gas tap;
• press button (gure 1) and set the boiler in winter mode
(section 3.2);
• open a hot water tap to reach a minimum 10 l/min ow
rate or ensure that maximum heating requirements are
set;
• remove the modulator cover;
• adjust the tube brass screw (a) Fig. 12 to obtain the pres-
sure settings shown in table 1;
• check that boiler feeding dynamic pressure, as measured
at the inlet gas valve pressure test point (Pa) (Figure 11)
is correct (37 mbar for propane gas G.31, 20 mbar for
natural gas G20);
17. FITTING A ROOM THERMOSTAT
To connect the room thermostat to the boiler terminal block, proceed as follows:
• reach the power supply terminal block (gure 10);
• connect the room thermostat to the terminals (1) - (2) and remove the jumper.

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16 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
Figure 12 b
a
0605_1502
Honeywell gas valve Sit gas valve
Table of burner pressures
240 Fi - 1.240 Fi 240 i - 1.240 i 310 Fi - 1.310 Fi
Gas used G20 G31 G20 G31 G20 G31
nozzle diameter (mm) 1,18 0,74 1,18 0,74 1,28 0,77
Burner pressure (mbar*) 1,9 4,9 1,9 4,7 1,8 4,9
REDUCED HEAT OUTPUT
Burner pressure (mbar*) 11,3 29,4 10,0 26,0 13,0 35,5
NOMINAL HEAT OUTPUT
no. of nozzles 15
* 1 mbar = 10,197 mm H2O
Table 1
240 Fi - 1.240 Fi 240 i - 1.240 i 310 Fi - 1.310 Fi
Gas consumption at 15 °C - 1013 mbar G20 G31 G20 G31 G20 G31
Nominal heat output 2,84 m3/h 2,09 kg/h 2,78 m3/h 2,04 kg/h 3,52 m3/h 2,59 kg/h
Reduced heat output 1,12 m3/h 0,82 kg/h 1,12 m3/h 0,82 kg/h 1,26 m3/h 0,92 kg/h
p.c.i. 34,02 MJ/m346,3 MJ/kg 34,02 MJ/m346,3 MJ/kg 34,02 MJ/m346,3 MJ/kg
Table 2
C2) Adjustment to reduced heat output
• disconnect the modulator feeding cable and unscrew the (b) Fig. 12 screw to reach the pressure setting corresponding
to reduced heat output (see table 1);
• connect the cable again;
• t the modulator cover and seal.
C3) Final checks
• apply the additional dataplate, specifying the type of gas and settings applied.
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17 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
19. INFORMATION DISPLAY
19.2 OPERATION INFORMATION
To display some useful information during the boiler operation proceed as follows:
•
Press the ( ) button for at least 6 seconds until the display shows “A00” (…“A07”) alternating with the respective
value (e.g. gure 13);
Figure 13
To correct light the boiler, proceed as follows:
• Provide power supply to the boiler.
When the gas boiler is power supplì, the display shows the following information:
1. all symbols alight;
2. manufacture information;
3. manufacture information;
4. manufacture information;
5. Type of boiler and gas used (eg. ).
The displayed letters mean the following:
= natural boiler chamber = sealed boiler chamber
= natural gas METANE = LPG gas
6. Hydraulic system;
7. Software version (two numbers x.x);
• open the gas cock;
• press the button, for at least two seconds, to set the operating boiler mode (see section 3.2).
19.1 FIRST DISPLAYED INFORMATION
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18 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
•Press the +/- domestic hot water buttons to display the following instantaneous information:
A00: domestic hot water temperature value (°C);
A01: outside temperature (with external probe sensor connected);
A02: modulatine current value (100% = 230 mA METANE - 100% = 310 mA GPL);
A03: power range level value (%) - see parameter F13 (section 20);
A04: temperature setpoint value (°C);
A05: central heating ow temperature value (°C);
A06: ow water value (l/min x 10);
A07: ame signal value (8-100%).
Note: lines A08 and A09 are not used.
•This function is active for 3 minutes. To exit the function, press button as described in section 3.2.
Note: the resetting operation is available only for 5 consecutive attempts, after which the RESET function is disabled and
the gas boiler remains blocked.
To carry out a new RESET attempt, proceed as follows:
• press the button for at least 2 seconds;
• reset the boiler pressing the
button for at least 2 seconds, the display shows “OFF”; .
• press the button for at least 2 seconds as describe in section 3.2.
See section 9 for error codes and anomalies description.
19.3 ANOMALIES DISPLAY

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19 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
20. PARAMETERS SETTING
To set the boiler parameters press the Rand -buttons together for at least 6 seconds. When the function is activated,
the display shows “F01” alternated with the value of the parameter.
Parameters setting
• Press +/- buttons for scrolling parameters;
• Press +/- buttons to change the single parameter
value;
• Press the P button to save changes, the display
shows “MEM”;
• Press the button to leave the function without
saving, the display shows “ESC”;
Default value
Description of parameter
240 Fi 1. 240 Fi 240 i 1. 240 i 310 Fi 1.310 Fi
F01 Type of gas boiler
10 = sealed chamber - 20 = atmospheric chamber 10 20 10
F02 Type of gas
00 = natural (metane) - 01 = LPG 00 o 01
F03 Hydraulic system
00 = instantaneous appliance 00 05 00 05 00 05
05 = non-instantaneous appliance
F04 Programmable relay 1 setting
(2 = zone system) 02
F05 Programmable relay 2 setting (not used) 04
F06 External sensor programmable input setting 00
F07…F12 Not used 00
F13 CH max. heating output (0-100%) 100
F14 D.H.W. max. heating output (0-100%) 100
F15 CH min. heating output (0-100%) 00
F16 Maximum temperature setpoint setting
00 = 85°C - 01 = 45°C 00
F17 Pump overrun time
(01-10 minuti) 03
F18 Minimum burner pause
in central heating mode (01-10 minuti) 03
F19 Not used 07
F20 Not used 00
F21 Anti-legionella function
00 = Disabled - 01 = Enabled 00
F22 Not used 00
F23 Maximum D.H.W. setpoint 60
F24 Not used 35
F25 Lack of water safety device 00
F26…F29 Manufacture information (only read parameters) --
F30 Not used 10
F31…F32 Not used 00
WARNING: do not modify the values of the “not used” parameters.
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20 INSTRUCTIONS PERTAINING TO THE INSTALLERBAXI - 925.529.1
The boiler has been designed in full compliance with European reference standards and in particular is equipped with the following:
• Air pressure switch for forced draught model (240 Fi - 310 Fi - 1.240 Fi - 1.310 Fi)
This switch (17 - gure 20) allows the burner to switch on provided the exhaust ue duct efciency is perfect.
In the event of one of the following faults:
• the ue terminal is obstructed;
• the venturi is obstructed;
• the fan is blocked;
• the connection between the venturi and the air pressure switch is interrupted;
The boiler will stay on stand-by and the display shows error code E03 (see section 9).
• Flue thermostat for natural draught (model 240 i - 1.240 i)
This device (15 - gure 21) has a sensor positioned on the left section of the ue extraction hood and shuts off the gas ow to the
burner if the ue duct is obstructed or in the event of draught failure.
Under such conditions the boiler is blocked and the display shows E03 error (see section 9).
To relight the main burner immediately, see section 9.
It is forbidden to disenable this safety device
• Overheat safety thermostat
Thanks to a sensor (12 - g. 20 /21) placed on the heating ow, this thermostat interrupts the gas ow to the burner in case the water
contained in the primary circuit has overheated. Under such conditions the boiler is blocked and relighting will only be possible after
the cause of the anomaly has been removed.
See section 9 to RESET normal operating conditions.
It is forbidden to disenable this safety device
• Flame ionization detector
The ame sensing electrode (19 - gure 20, 16 - gure 21), placed on the right of the burner, guarantees safety of operation in case of
gas failure or incomplete interlighting of the burner. The boiler is blocked after 3 relight attempt.
See section 9 to RESET normal operating conditions.
• Hydraulic pressure sensor
This device (3 - gure 20/21) enables the main burner only to be switched on if the system pressure is over 0.5 bars.
• Pump overrun for central heating circuit
The electronically-controlled supplementary running of the pump lasts 3 minutes (F17 - Section 20), when the boiler is in the central
heating mode, after the burner has switched off due to a room thermostat or intervention.
• Pump overrun for domestic hot water circuit
The electronic control system keeps the pump operating for 30 seconds in domestic hot water mode after the D.H.W. sensor has
switched off the burner.
• Frost protection device (central heating and domestic hot water systems)
Boilers electronic management includes a “frost protection” function in the central heating system which operates the burner to reach
a heating ow temperature of 30°C when the system heating ow temperature drops below 5 °C.
This function is enabled when the boiler is connected to electrical supply, the gas supply is on and the system pressure is as requi-
red.
• Lack of water circulation (probable pump jammed)
If the water inside the primary circuit doesn’t circulate, the display shows E25 error (see section 9).
• Anti-block pump function
In the event that no heat is required, the pump will automatically start up and operate for one minute during the following 24 hours.
This function is operative when the boiler is powered.
• Three-way anti-blockage valve
In the case of no heat is request for a period of 24 hours the three way valve carries out a complete commutation.
This function is operative when the boiler is powered.
• Hydraulic safety valve (heating circuit)
This device (28 - gure 20, 25 - gure 21) is set to 3 bar and is used for the heating circuit.
The safety valve should be connected to a siphoned drain. Use as a means of draining the heating circuit is strictly prohibited.
• Antilegionella function (models 1. 240 Fi - 1. 240 i - 1.310 Fi with D.H.W. storage tank)
The antilegionella function is NOT enable.
To enable the function, set the parameter F21=01 (as described in section 20). When the function is activated, at weekly intervals
the boiler’s electronic control system brings the water inside the hot water tank to a temperature above 60°C (the function is only
operational if the water has never exceeded 60°C in the previous 7 days).
Note: domestic hot water is guaranteed even if the NTC sensor (5 - gure 20 - 21) is damaged. In this case, the temperature control is
carried out by the boiler ow temperature.
21. CONTROL AND OPERATION DEVICES