Fondital BALI B BTNE 25 Operation instructions

IST 03 C 192 - 01
INSTALLATION, USE
AND MAINTENANCE
BALI B
BTNE 25 - BTNE 32 - BTNE 42
BTFSE 24 - BTFSE 32 - BTFSE 36
GB

Dear Customer,
Thank you for choosing and buying one of our boilers. Please read these instructions carefully in order to
install, operate, and maintain this equipment properly.
1

This INSTRUCTION MANUAL,
which is an integral and indispen-
sable part of the product, must be
delivered to the user by the installer
and must be kept in a safe place for
future reference. The manual must
accompany the boiler should it be
sold or its possession transferred.
The boiler must be used for the
purposes for which it has been
intended. Any other use shall be
considered incorrect and there-
fore dangerous.
The boiler must be installed in com-
pliance with applicable laws and
standards and according to the
manufacturer’s instructions given in
this manual. Incorrect installation
may cause injury to persons and/or
animals and damage to property.
The manufacturer shall not be held
liable for any such injury and/or
damage.
Damage and/or injury caused by
incorrect installation or use and/or
damage and/or injury due to non-
observance of the manufacturer’s
instructions shall relieve the manu-
facturer from any and all contractual
and/or extra-contractual liability.
Before installing the boiler, check
the technical data to be compatible
with the requirements for its opera-
tion in the system.
Check that the boiler is intact and it
has not been damaged during tran-
sport and handling. Do not install
equipment which is damaged and/
or faulty.
Do not obstruct the air suction and/
or heat dissipation openings.
Onlymanufacturer-approvedacces-
sories and optional kits are to be
installed.
Properly dispose of the packaging
as all the materials can be recycled.
The packaging must therefore be
sent to specific waste management
sites.
Keep the packaging out of the reach
of children as by its nature it may
represent a hazard.
In the event of failure and/or faulty
functioning, switch off the boiler. Do
not attempt to repair it and contact a
qualified service technician.
Manufacturer-approved parts must
be used for all repairs to the boiler.
Non-observance of the above requi-
rements may affect the safety of
the boiler and endanger people,
animals and property.
The manufacturer recommends
our Customers to have the boiler
serviced by an Authorized Service
Centre.
In order to guarantee efficient
and correct functioning of the
equipment it is legally binding to
have the boiler serviced once a
year, according to the schedule
specified in the relevant section
of this manual.
In the event of long periods of inac-
tivity of the boiler, disconnect it from
power mains and close the gas tap
(Warning: the boiler anti-frost func-
tion is disabled).
Should there be a risk of freezing,
add antifreeze: it is not advisable
to empty the system as this may
result in damage; use specific anti-
freezing products suitable for multi-
metal heating systems.
IMPORTANT
Should gas smell be perceived pro-
ceed as follows:
- do not turn on or off electri-
cal switches and do not turn on
electrical appliances;
- do not ignite flames and do not
smoke;
- close the main gas tap;
- open doors and windows;
- contact a Service Centre, a qua-
lified installer or the gas supply
company.
Never use a flame to detect gas
leaks.
WARNING
This boiler has been built for installation in the country indicated on
the technical data plate: installation in any other country may be sour-
ce of danger for people, animals and property.
2
General information for the installer, maintenance technicians and users

General information for the installer, maintenance technicians and users page 2
1. Instructions for the user page 4
1.1. Control panel page 4
1.2. Operating the boiler page 5
1.2.1. Switching on page 5
1.2.2. Operation page 5
1.2.2.1. AQUA PREMIUM system page 5
1.2.2.2. Instantaneous DHW production page 5
1.2.2.3. Thermal unit managing one high temperature CH area and DHW supply page 5
1.2.2.4. Thermal unit managing one mixed water CH area, one high temperature CH area and DHW supply (V version) page 6
1.2.2.5. Anti-Legionella function page 7
1.2.2.6. Pump anti-seizure function page 7
1.2.2.7. Phone operation function page 7
1.2.3. Electronic programmer setup page 7
1.2.4. Boiler shutdown page 8
1.2.5. Burner shutdown page 8
1.2.6. Shutdown due to overheating page 8
1.2.7. Shutdown due to air/flue gas system malfunction page 8
1.2.8. Shutdown due to insufficient water pressure page 9
1.2.9. Shutdown due to malfunction of temperature probes page 9
1.3. Maintenance page 9
1.4. Information for the user page 9
2. Technical characteristics and dimensions page 10
2.1. Technical characteristics page 10
2.2. Dimensions page 10
2.3. Boiler layout page 12
2.4. Operational data page 13
3. Instructions for the fitter page 14
3.1. Installation standards page 14
3.2. Installation page 14
3.2.1. Packaging page 14
3.2.2. Choosing where to install the boiler page 14
3.2.3. Positioning the boiler page 14
3.2.4. Boiler room ventilation page 15
3.2.5. Air/flue gas system configuration page 15
3.2.6. Verifying combustion efficiency page 17
3.2.7. Gas main connection page 17
3.2.8. Power main connection page 17
3.2.9. Hydraulic connections page 17
3.2.10. Room thermostat connection page 17
3.2.11. Adjustable by-pass page 17
3.2.12. Installation of original kits page 18
3.3. Loading the system page 18
3.4. Starting the boiler page 18
3.4.1. Preliminary checks page 18
3.4.2. On/off switching page 18
3.5. Wiring diagram page 19
3.6. Switching to different gas and burner adjustment page 21
4. Maintenance page 21
5. Troubleshooting page 22
TABLE OF CONTENTS
3

1. Indication light (red): when the light is on, it indicates that the
flame detection electronics have shut down the boiler. Boiler reset
is operated through switch no. 16.
2. Indication light (red): when the light is on, it indicates that the
safety thermostat has shut down the burner. The boiler will automa-
tically resume operation by resetting the safety thermostat through
button no. 18.
3. Indication light (green): when the light is on and fixed, it indica-
tes that power is supplied to the flame detection pcb (flame might
still not be present.
4. Indication light (red): when the light is on and fixed, it indicates
that the temperature of the water in the heating system is between
25°C and 35°C.
When the light is blinking, it indicates that the water pressure switch
has detected insufficient water pressure. When operational water
pressure is restored, the water pressure switch will resume boiler
operation and the led will turn off.
5. Indication light (red): when the light is on and fixed, it indicates
that the temperature of the water in the heating system is between
36°C and 45°C.
When the light is blinking, it indicates that the temperature probe
no. 1(CH flow) is faulty (interrupted or out of range). The burner is
shut down, pumps still operate. As soon as the probe is replaced,
the led will turn off and the boiler will resume operation.
When indication lights no. 4and no. 5flash simultaneously, it indi-
cates that the external temperature probe (optional equipment) is
faulty or disconnected. Once the probe is replaced or re-connected,
the lights will turn off.
6. Indication light (red): when the light is on and fixed, it indicates
that the temperature of the water in the heating system is between
46°C and 55°C.
When the light is blinking, it indicates that the connection between
boiler and remote control is interrupted or there are signal passage
difficulties. Once the connection is restored the light will turn off and
the boiler will resume operation.
7. Indication light (red): when the light is on and fixed, it indicates
that the temperature of the water in the heating system is between
56°C and 65°C.
When the light is blinking, it indicates that the temperature probe
no. 2(water tank) is faulty (interrupted or out of range). The boiler
operates in CH and instantaneous DHW supply mode only.As soon
as the probe is replaced, the boiler will resume operation.
8. Indication light (red): when the light is on and fixed, it indicates
that the temperature of the water in the heating system is between
66°C and 75°C.
When the light is blinking, it indicates that the temperature probe no.
3(plate heat exchanger) is faulty (interrupted or out of range). The
boiler operates in CH supply mode only. As soon as the probe is
replaced, the boiler will resume operation (including DHW supply).
9. Indication light (red): when the light is on and fixed, it indicates
that the temperature of the water in the heating system is between
76°C and 85°C.
When the light is blinking, it indicates that CH water temperature
has exceeded 85°C.
The led can also be turned on by the flue gas thermostat (BTN boi-
ler model). Reset of the flue gas thermostat is to performed through
button no. 19.
10. Indication light (green): when the light is on and fixed, it indi-
cates that the boiler is operating in CH mode.
11. Boiler mode selector: this selector allows to choose the boiler
mode (please, refer to paragraphs 1.2.2.3. and 1.2.2.4.).
12. DHW supply knob: the knob allows for DHW supply mode
management (please, refer to 1.2.2.3 and 1.2.2.4 paragraph).
13. CH water temperature knob: the knob allows for CH mode
management (please, refer to 1.2.2.3 and 1.2.2.4 paragraph).
14. Water pressure gauge: it shows water pressure in the heating
system.
15. Programmer: the programmer can be set for CH and DHW
supply scheduling (please, refer to 1.2.2.3 and 1.2.2.4 paragraph).
16. Reset button: press the button to restore boiler operation after
shut down due to flame non-detection.
17. Power switch: when the switch is in position I, power is sup-
plied to the boiler and the switch is lit. When the switch is in position
O, power is not supplied to the boiler and the switch light is off.
18. Reset button: press the button to restore boiler operation after
shut down due to safety thermostat intervention.
19. Reset button (BTN model only): press the button to restore
boiler operation after shut down due to flue gas safety thermostat
intervention (BTN boiler model).
In case of malfunction or pressure switch intervention (BTFS boiler
model) the burner is shut down. Boiler operation will resume as
soon as normal pressure range values are restored.
1. INSTRUCTIONS FOR THE USER
1.1 Control panel
4
pic. 1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 (BTN)

1.2 Operating the boiler
1.2.1 Switching on
- Open the gas stop cock.
- Turn power mains switch to ON.
- Set boiler power switch no. 17 (pic.1) to ON (the switch lights up)
- Choose boiler mode through knob no. 11, no. 12 and no. 13 and
the programmable programmer no. 15 (please, refer to 1.2.2.3 and
1.2.2.4 paragraph).
- Adjust room temperature through room thermostat (when available).
- When CH is required, no. 10 light comes on (pic. 1).
- When the burner is on, no. 3light comes on (the light comes on
when the ame detection electronics are powered, therefore even
if the light is on, ame might still not be present).
WARNING
should the boiler be left inactive for a long time, particularly
when boiler is red by LPG, ignition might be difcult. Before
starting the boiler, switch on a different gas red device (e.g.
kitchen range, oven, etc.). Beware that even by following this
procedure, the boiler might still experience some starting dif-
culties and shut down once or twice. Reset boiler by acting
on no. 16 button (pic. 1).
1.2.2. Operation
The boiler is equipped with patented AQUAPREMIUM system.
1.2.2.1 AQUA PREMIUM system
The boiler is equipped with a 60 l stratication water tank and a
secondary plate heat exchanger.
The boiler can either function as a standard instantaneous boiler,
when the water tank is deactivated, or through the innovativeAQUA
PREMIUM system when the water tank is switched ON.
Water tank activation and deactivation can be operated by the user
via knob no. 12 and programmer on the control board
(please, refer to 1.2.2.3 paragraph, DHW section).
When the water tank is switched ON (AQUA PREMIUM mode),
and DHW is requested, the ow switch detects the water stream;
the boiler turns ON, the cut-off valve is opened and the DHW pump
is turned ON (the pump ow rate is xed).When DHW demand is
smaller than DHW pump ow rate, DHW to the tap is supplied by
the secondary exchanger only and the excess DHW produced is
deviated to the water tank.
When DHW demand is larger than DHW pump ow rate, DHW
produced by the secondary exchanger is joined by DHW from the
water tank; the combined DHW ow rate is larger than the one that
can be produced by instantaneous boilers of identical thermal ou-
tput or standard system boilers with same capacity water tank.
The boiler can also be operated as a standard instantaneous boi-
ler, when the water tank is disabled.
1.2.2.2 Instantaneous DHW production
While the water tank is disabled, the boiler operates as a standard
instantaneous boiler: the cut-off valve is closed and the DHW pump
is always off. In this instance DHW supply is granted by the secon-
dary heat exchanger only and maximum available DHW ow rate
depends exclusively on the boiler thermal output.
DHW ow rate in liters per minute relies upon the boiler thermal
output and water main supply temperature, according to the fol-
lowing formula:
l = DHW in liters per minute = K / ΔT
K represents:
- 344 for BTFS 24 model
- 459 for BTFS 32 model
- 523 for BTFS 36 model
- 358 for BTN 25 model
- 450 for BTN 32 model
- 610 for BTN 42 model
ΔT = DHW temperature – water mains supply temperature
E.g. In BTFS 24 model, should water mains supply temperature be
8°C and DHW required to 38°C, the value of ΔT is:
ΔT = 38 °C – 8 °C = 30 °C
and DHW liters per minute available at the required temperature
of 38°C are:
344
l = ------------- = 11.5 [liters per minute]
30
The boilers, both BTN and BTFS modes, are divided in two fami-
lies:
a) Thermal unit managing one high temperature CH area and DHW
supply
b) Thermal unit managing one mixed CH water area, one high tem-
perature CH area and DHW supply (“V” version)\\ q>.
1.2.2.3 Thermal unit managing one high temperature CH area
and DHW supply
Position no. 17 switch to I: power is connected to the boiler and the
switch lights up.
Boiler operation mode is selected through knob no. 11. In detail:
“Programmer” position
The boiler electronics manage the program set via the two-channel
programmerno. 15.The user managesCH boileroperation through
channel 1 (please, see CH section). The user manages DHW boiler
operation through channel 2 (please, see DHW section).
- CHANNEL 1 without external temperature probe.
When the programmer is OFF, CH is OFF. When the programmer
is ON, CH is managed through the room thermostat.
- CHANNEL 1 with external temperature probe.
Please, see “SLIDING” TEMPERATURE OPERATION section.
- CHANNEL 2
When the programmer is OFF, DHW is supplied by the plate
heat exchanger only.The boiler operates as a standard “instanta-
neous” boiler. DHW supply is not largest and enough to shower,
dishwashing, etc. When the programmer is ON, DHW is supplied
both by the plate heat exchanger and the water tank. DHW is lar-
gest in this instance.
The programmer can host up to 8 ON daily times and 8 OFF daily
times. Five programmable time areas are available in each day for
repetition of ON/OFF programs within the same week (1: single
day; 2: Mon-Fri; 3: Sat-Sun; 4: Mon-Sat; 5: Mon-Sun).
“Comfort” position.
QBoiler CH operation management only. Programmer is conside-
red as always turned ON, regardless of its programs.
CH is turned ON or OFF by the room thermostat or thermoregula-
tion control unit. “Comfort” position with external temperature pro-
be: please, see “SLIDING” TEMPERATURE OPERATION section.
“Reduced” position
Boiler CH operation management only. Programmer is considered
as always turned OFF, regardless of its programs. CH is always
OFF regardless of the room thermostat or thermoregulation control
unit signals.
NOTE : boiler operation in this position without external tem-
perature probe is the same of that in “Summer” position. “Re-
duced” position is desirable only when the boiler is equipped
with an external temperature probe (please, see “SLIDING”
TEMPERATURE OPERATION section).
5

6
“Anti-frost” position
Boiler is in stand-by mode. All boiler functions are inactive besides
“Anti-frost”. “Anti-frost” function protecting CH ow: when the ow
probe detects a temperature below 5°C, the boiler turns ON until
the ow temperature reaches 50°C or 15 mins.
“Anti-frost” function protecting DHW: when the water tank probe de-
tects a temperature below 5°C, the boiler turns ON until the water
in the tank reaches 10°C or 15 mins.
“Summer” position
Boiler operates in DHW supply mode only.
DHW
DHW supply supersedes any other boiler function.
The user might set DHW parameters through knob 12, programmer
15 and the mixing valve (pic. 2).
- knob 12 allows for selection of DHW production mode (withAQUA
PREMIUM SYSTEM or “instantaneous production”) and to set
DHW temperature in the water tank (50°C to 65°C); it is recom-
mended to set storage tank water temperature around 60°C (turn
knob clockwise almost fully);
- programmer 15 allows for selection of automatic water tank
switching on and off;
- mixing valve (pic. 2) allows to set DHW temperature to the tap.
In detail the user might choose to have DHW supplied in “instanta-
neous“ or “AQUA PREMIUM” system mode.
By turning knob 12 fully counter-clockwise, after a couple of secon-
ds LED will switch on or off.
led ON indicates “enabled water tank” mode (AQUAPREMIUM
system).
led OFF indicates disabled water tank (“instantaneous mode
boiler”).
InAQUA PREMIUM mode, setting channel 2 through the program-
mer, it is possible to select automatic switching on/off programs for
the water tank (see sect. 1.2.3 “Electronic programmer setup”).
NOTE
When the boiler is set to AQUA PREMIUM system mode, channel
2 settings of programmer 15 manages DHW also.
When the programmer is ON, the boiler is in “enabled water tank”
mode (AQUA PREMIUM system), when the programmer is OFF,
the boiler operates as a standard “Instantaneous” boiler ( led
is always ON).
DHW ow temperature is to be adjusted through the thermostatic
valve located in the rear area of the boiler (pic. 2).
Turn valve knob counter-clockwise (+ position) to increase DHW
temperature, turn valve knob clockwise (- position) to decrease
DHW temperature.
In order to adjust DHW ow temperature to approximately 50°C,
shut the valve off by turning its knob fully clockwise, then turn it
three and a half rotations counter-clockwise.
CH
Boiler electronics manage temperature and operation of the radia-
tors through adjusting knob 13 and mode selecting knob 11. Knob
13 sets CH ow temperature and “warm boiler ON” – “warm boiler
OFF” functions.
In addition to that, when the boiler is equipped with an external
temperature probe, the user sets a ctitious room temperature va-
lue via knob 13 (please, see “SLIDING” TEMPERATURE OPERA-
TION section).
Knob 13 is used to adjust two settings:
1. CH ow temperature (50°C to 90°C range).
2. Set boiler to “warm boiler ON” – “warm boiler OFF” mode.
When the boiler is in “warm boiler ON” mode ( led ON), the
primary heat exchanger, when CH or DHW are not required, is kept
to a constant 50°C temperature.
When the boiler is in “warm boiler OFF” mode ( led OFF), the
primary heat exchanger, when CH or DHW are not required, is not
heated and the boiler stays OFF.
In order to select “warm boiler ON” – “warm boiler OFF” mode,
proceed as follows.
- Turn CH temperature adjusting knob fully counter-clockwise.
- Wait for two seconds until the led which indicates the boiler ope-
ration mode changes its status (from ON to OFF or vice-versa)
(please, see above instructions).
- Now CH temperature can be set through the adjusting knob.
NOTE
It is convenient to set the boiler to “warm boiler ON” mode, particu-
larly during summer and when the boiler is set to “instantaneous”
mode, because, being the boiler heat exchanger already warm, it
supports the plate heat exchanger in providing DHW more promp-
tly.
1.2.2.4 Thermal unit managing one mixed water CH area, one
high temperature CH area and DHW supply (V version)
Boiler operation indications, malfunction diagnosis, and DHW
supply mode are identical to the thermal unit managing one high
temperature CH area and DHW supply; CH operation mode is dif-
ferent.
The following instructions refer to what changes in boiler without
mixed water CH area management.
Position no. 17 switch to I: power is connected to the boiler and the
switch lights up.
Boiler operation mode is selected through knob 11. In detail:
“Programmer” position
The boiler electronics manage the program set via the two-channel
programmer 15. The user manages CH boiler operation through
channel 1 (please, see CH section). The user manages DHW boiler
operation through channel 2 (please, see DHW section).
- CHANNEL 1 with external temperature probe.
Channel 1 ON: CH ow temperature (high and low temperature
areas) is managed in order to maintain the COMFORT room tem-
perature set through knob 13.
Channel 1 OFF: CH ow temperature (high and low temperature
areas) is managed in order to maintain the REDUCED room tem-
perature.
REDUCED room temperature = COMFORT room temperature mi-
nus 4°C; when CM4 jumper is positioned to 0– please, see wiring
diagram section;
REDUCED room temperature = COMFORT room temperature mi-
nus 2°C; when CM4 jumper is positioned to 1).
Room thermostats turn ON or OFF the relevant zone pumps, and
when all room thermostats are set to OFF, CH demands termina-
te.
pic. 2

- CHANNEL 2
As described in the “thermal unit managing one high temperature
CH area and DHW supply” section.
The programmer can host up to 8 ON daily times and 8 OFF daily
times. 5 programmable time areas are available for each day, for
repetition of ON/OFF programs within the same week (1: single
day; 2: Mon-Fri; 3: Sat-Sun; 4: Non-Sat; 5: Mon-Sun).
“Comfort” position.
Boiler CH operation management only. Programmer is considered
as always turned ON, regardless of its programs. Room tempera-
ture is the one set as “COMFORT”.
Room thermostats turn ON or OFF the relevant zone pumps, and
when all room thermostats are set to OFF, CH demands termina-
te.
“Reduced” position
Boiler CH operation management only. Programmer is considered
as always turned OFF, regardless of its programs. Room tempera-
ture is the one set as “REDUCED”.
Room thermostats turn ON or OFF the relevant zone pumps, and
when all room thermostats are set to OFF, CH demands termina-
te.
Knob 13 is disabled for CH ow temperature adjusting, it sets the
ctitious room temperature (please, see “SLIDING” TEMPERATU-
RE OPERATION section).
“SLIDING” TEMPERATURE
The boiler adjusts the temperature of CH ow to the high tempera-
ture zone (temperature of the radiators) and the temperature of the
low temperature zone (oor heating) following the signals from:
- external temperature readings from the external probe
- desired room temperature to be set through knob 13. 12°C to
28°C range.
Knob 13 turned fully counter-clockwise correspond to 12°C room
temperature; knob 13 set to 09:00 hours correspond to 15°C; knob
13 set to 12:00 hours correspond to
20°C; knob 13 set to 03:00 hours cor-
respond to 25°C; knob 13 turned ful-
ly clockwise correspond to 28°C; for
best CH curve setup, turn knob 13 to
position corresponding to 20°C;
1.2.2.5 Anti-Legionella function
Anti-Legionella function is activated
every 15 days, it consists in heating
up the water tank to 65°C for 30 mins,
regardless of all other setups.
1.2.2.6 Pump anti-seizure function
When the pumps or electric valves are left inactive for 24 hours,
the pump anti-seizure function operates the pumps and electric
valves for 3 mins.
1.2.2.7 Phone operation function
When a phone operation module is connected to the boiler pcb, the
“COMFORT” function and the loading of the boiler can be remotely
activated regardless of knob 11 position.
1.2.3 Electronic programmer setup
A. Initialization
When setting up the programmer for the rst time or re-program-
ming it, it is advisable to reset it by turning selector 2to RUN and
pressing the reset micro-switch R: Time, ON and OFF programs
will be deleted (time display will ash 0:00).
In order to set the day of the week, current time, ON and OFF pro-
grams, please see below sections Band C.
B. Setting the day of the week and current time
Position selector 2to RUN and press h and m buttons at the same
time, until the two dots dividing hours and minutes display stop
ashing (If the reset micro-switch Rwas previously pressed, the
time display stops ashing also); press button 1...7 in order to set
the day of current week (displayed by indicator 8), press button h
in order to set current hour, press button min order to set current
minutes (when hand mare simultaneously pressed, the digital
display runs fast).
Wait for approximately ten seconds until the two dots dividing hours
and minutes display start ashing. Now the day of the week and
current time setup procedure is completed.
C. ON and OFF program setup
Set selector 2to P1 in order to program channel 1and to P2 in
order to program channel 2(display 3indicates the number of cho-
sen channel, indication 4displays symbol to indicate that we
are setting an ON time, display 5indicates 1 as the rst program is
being set; up to 8ON and OFF intervals are available for program-
ming, that is 16 times).
Follow the below described procedure in order to set the ON time:
- press button 1...7 in order to set the desired of the week (or days
of the week (1));
- press button hand then button min order to set hour and minutes
of the ON time;
- press button in order to conrm the programmed ON time and
proceed to the programming of the OFF time (indicator 4is off and
it indicates that an OFF time is being set; indicator 5displays 2
indicating the second time is being set).
Follow again the above described procedure, in order to set the
OFF program and after that, press button.
Now one boiler operation interval is set through its ON and OFF
programmed times, indicator 5displays 3; In order to set an addi-
tional ON time, follow the above instructions, or move selector 2to
RUN in order to terminate the programming procedure.
(1)By repeatedly pressing button 1...7, the following programmable
time areas are available in order to automatically repeat the ON
and OFF programs within the same week:
No. 1 programmable time area: single week day
No. 2 programmable time area: Monday through Friday
No. 3 programmable time area: Saturday and Sunday
No. 4 programmable time area: Monday through Saturday
No. 5 programmable time area: Monday through Sunday
When programming an ON time in a multi-day programmable time
area (e.g. no. 2), the OFF time must be set in the same program-
mable time area in order to make it effective to all days included in
the area.
7
KEY CHART
1Operating mode selector
2Programming selector
3Channel indicator
4Channel activation indicator
5Indication of the programmed
period
6SKIP function button
7SKIP function indication
8Week-day indicator
9Current time indicator
pic. 3

8
D. Programmer operation modes
Selector 1on the programmer sets the following boiler operation
modes:
Ipermanently ON mode (the selected channel or channels
are always active)
AUTOoperation through programmed setup (the two channels, 1
and 2, are activated or deactivated following the
programmed setup; please see paragraph Cfor
programming procedure)
Opermanently OFF mode (the selected channel or channels
are always off)
Permanently ON mode (I)
In order to have one channel always active, proceed as follows:
Position selector 1to position I, press once button 6to activate
channel 1, press it twice to activate channel 2; the selected channel
will ash for 3 secs (indicator 3), after that it will be displayed xed
and symbol will be displayed (indicator 4), now the channel will
remain permanently active.
Selector 1must remain set to position I.
In order to have both channel active, repeat the above described
procedure, by selecting the channel not previously activated. Indi-
cator 3 will display 1 and 2, conrming activation of both channels
When only one of the channel is permanently activated, the other
channel is operative following its programmed setup (please, see
paragraph Cfor detailed programming procedure).
In order to cancel the permanent activation of channels, set se-
lector 1to AUTO.
Operation through programmed setup (AUTO)
This mode allows for channels to be active or inactive following the
programming setup (please, see paragraph Cfor programming
procedure).
When an ON/OFF interval is active, symbol (indicator 4) and the
number of the active channel are displayed (indicator 5).
Permanently OFF mode (O)
When one channel is to be always inactive, proceed as follows:
Set selector 1to position O, press once button 6in order to select
channel 1, press it twice in order to select channel 2; the selected
channel will ash (indicator 3), do not press any button for 3 secs,
now the channel will be permanently inactive (indicator 3 will keep
ashing the selected channel).
Selector 1is to be kept in position O.
In order to set both channel inactive, repeat the above described
procedure by selecting the channel that was not previously cho-
sen.
Indicator 3 will ash 1 and 2, conrming de-activation of both chan-
nels.
When one channel is permanently deactivated, the other channel
operates following its programmed setup (please, see paragraph C
for detailed programming procedure).
In order to cancel the permanent de-activation of channels, set se-
lector 1 to AUTO.
It is also possible to permanently activate one channel and perma-
nently de-activate the other.
In order to implement the above described program, proceed as
follows:
set selector 1to position I, press once button 6in order to activate
channel 1, press it twice in order to activate channel 2; the selected
channel will ash for 3 secs (indicator 3), after it will be displayed
xed and symbol will be displayed (indicator 4), now the chan-
nel will be permanently active.
Rapidly set selector 1to position O, without stopping in position
AUTO, press once or twice button 6to select the channel to be per-
manently deactivated; the selected channel will ash (indicator 3),
while the previously activated channel will continue to be displayed
xed, and symbol will remain on (indicator 4), do not press any
button for 3 secs, now the channel will remain permanently deacti-
vated (indicator 3 will keep ashing the selected channel).
E. SKIP function programming procedure
The SKIP function (program skipping) allows to change the ope-
rational status of the programmer from ON to OFF and vice-versa,
after pressing button 6. the SKIP function stays active until the next
programmedintervention.Theactivation of the function is displayed
by the symbol.
In order to deactivate the SKIP function, press again button 6. The
SKIP function is active only when the programmer is set to AUTO
mode.
The symbol is displayed to show the boiler ON status (indicator 4).
Technical characteristics
Power supply: 220-240V approx. 50/60Hz
Relay output: 2 x 5A; 250V approx. single poled contact
Lithium battery maintaining program memory for 5 years
Minimum commutation intermission: 1 minute
1.2.4. Boiler shutdown
When the boiler malfunctions, the burner is automatically shu-
tdown.
Please, see the troubleshooting section in this manual, for possible
shutdown cause detection.
1.2.5 Burner shutdown
When the burner malfunctions, the boiler automatically shuts down
and light 1turns on.
Should this happen, proceed as follows:
• check the gas stopcock to be open, and the presence of gas in the
network pipes, by lighting the burner of a kitchen stove.
• after verifying gas supply availability, reset the burner by pres-
sing button 16 on the control panel: should the boiler not resume
operation within the third attempt, have the boiler serviced by an
Authorized Service Centre or qualied personnel.
Should the burner shut down frequently, showing a recurring mal-
function, have the boiler serviced by an Authorized Service Centre
or qualied personnel.
1.2.6 Shutdown due to overheating
Should the overheating red light 2come on, signalling the safety
thermostat intervention due to a malfunction, contact anAuthorized
Service Centre or qualied personnel for service.
1.2.7 Shutdown due to air/ue gas system malfunction
Should a malfunction occur, causing air intake and/or ue gas di-
scharge system failure, the boiler stops operating.
Natural draught boiler model (BTN) shuts down, no. 9red light star-
ts ashing, and this boiler status continues until correct air/ue gas
system correct operation is restored and reset button 19 is pres-
sed.
Forced draught boiler model (BTFS) stands-by, and this boiler sta-
tus continues until correct air/ue gas system correct operation is
restored.
WARNING
The only solution to this condition is accessible by having the
boiler serviced by qualied personnel or an Authorized Servi-
ce Centre.

1.2.8 Shutdown due to insufcient water pressure
In the event of boiler shutdown due to water pressure switch inter-
vention, no. 4 red light starts blinking, signalling insufcient water
pressure in the CH system.
In order to restore water pressure, proceed as follows (see pic. 4):
- open the loading tap by rotating it counter-clockwise in order to
allow water in the boiler, and keep it open until the water pressure
gauge (14 in pic.1) displays a pressure of 1-1,3 bars; close the
loading tap by rotating it clockwise.
WARNING
Once the loading procedure is completed, fully close the inlet
tap. Should the tap not be properly closed, as pressure increa-
ses, boiler CH safety valve may open and water ow out.
Should boiler frequently shut down due to insufcient water pres-
sure, have it serviced by an Authorized Service Centre or qua-
lied personnel.
1.2.9 Shutdown due to malfunction of temperature probes
Should the burner shut down due to malfunctioning of temperature
probes, the following lights turn on and ash:
- red light 5(pic.1) for probe 1 (CH)
- red light 7for probe 2 (water tank)
- red light 8for probe 3 (plate heat exchanger)
In this instance, contact an Authorized Service Centre or qualied
personnel for service.
1.3 Maintenance
The user may only clean the external boiler casing, by means
of commonly marketed household products.
Do not use water!
As provided by law, the boiler is to be serviced once a year. Correct
maintenance ensures boiler to function efciently, environmentally
friendly, preventing any danger to people, animals or property.
Only qualied personnel are lawfully allowed to service the boiler.
The manufacturer recommends Customers to contact an Authori-
zed Service Centre for maintenance and repairs.
1.4 Information for the User
The user may only access boiler parts that can be reached
without using technical equipment and/or tools: the user is
not authorized to remove boiler housing and operate on any
internal part. No one, including qualied personnel, is authori-
zed to modify the boiler.
The manufacturer shall not be held responsible for damage to
people, animals, or property, due to tampering with the boiler
or improper intervention.
Should the boiler be left inactive for a long time and power
main supply disconnected, it might be necessary to unlock
the pump.
Pump service includes boiler housing dismounting and ac-
cess to boiler internal parts, therefore only qualied personnel
may perform it.
Pump blockage may be avoided by mixing to water, lming
additives suitable for multi-metal systems.
CH system can be properly protected from frost by using spe-
cic anti-frost additives suitable for multi-metal systems. Do
not use automotive products and verify the additive efciency
over time.
The boiler is equipped with a thermometer allowing for water
temperature verication.
LOADING TAP
9
pic. 4

10
2. TECHNICAL CHARACTERISTICS AND DIMENSIONS
2.1 Technical characteristics
The boiler is equipped with a high output cast iron heat exchanger
and atmospheric gas burners.
All versions are equipped with electronic ignition, ionization ame
detection device, AQUA PREMIUM system for DHW supply em-
ploying a 60 ltrs stainless steel stratication water tank and a plate
secondary heat exchanger.
The following versions are available:
BTN E 25: open chamber, natural draught boiler with 25.1 kW heat
output;
BTN E 32: open chamber, natural draught boiler with 31.4 kW heat
output;
BTN E 42: open chamber, natural draught boiler with 42.5 kW heat
output.
BTFS E 24: sealed chamber, forced draught boiler with 24.0 kW
heat output;
BTFS E 32: sealed chamber, forced draught boiler with 32.0 kW
heat output;
BTFS E 36: sealed chamber, forced draught boiler with 36.5 kW
heat output.
Allmodels areavailableinVversion,equippedwithcollector,mixing
valve and two additional pumps for management of one high tem-
perature zone and one low temperature zone.
In addition, the boiler is manufactured in accordance to laws and
standards in force in the country named on the boiler technical
data plate.
Installation in a different country from the one mentioned might
endanger people, animals and cause damage to property.
The main technical characteristics of the boiler are listed below:
Manufacture characteristics
- High-output cast iron heat exchanger
- Stainless steel plate DHW heat exchanger
- Stainless steel horizontal stratication 60 l water tank with
sacricial magnesium anode
- Glass wool, aluminium layered, high thickness (50mm) insulation
- Plastic layered, metal sheet casing
- Gas valve
- Motorized deviating valve
- Three-speed CH circulation pump
- Single-speed DHW circulation pump
- 12 lt. CH expansion vessel (18 lt. for BTN E 42 model)
- 5 lt. DHW expansion vessel
- CH water, water tank and plate heat exchanger temperature
probes
- Adjustable by-pass
- CH system air purging device
- DHW priority ow switch
- Safety limit thermostat (110°C)
- Air pressure switch (BTFS model)
- Flue gas thermostat (BTN)
- DHW lter
- CH system loading tap
- CH system unloading tap
- Insufcient water pressure safety switch
- Electronics ready to host an additional pcb for management
of three different CH zones (optional kit).
User interface
- Selector managing the following functions: PROGRAMMER,
COMFORT TEMPERATURE, REDUCED TEMPERATURE,
ANTI-FROST,SUMMER
- CH water temperature adjusting knob
- DHW water temperature adjusting knob
- Power switch with light
- Led thermometer
- Pressure gauge
- Control panel with lights indicating:
• Power supply
• CH water supply
• Communication to remote control error
• Flame detecting device shutdown
• Overheating shutdown
• Low water pressure shutdown
• Temperature probe malfunction shutdown
• Air inlet/ue gas system malfunction shutdown.
2.2. Dimensions
pic. 5A
Model BTN E
G: Gas inlet
C: DHW flow
F: Cold water inlet
M: CH flow
R: CH return
D: Flue gas outlet
(130 mm for BTN 25,
150 mm for BTN 32 and BTN 42)

11
pic. 5B
Model BTN EV
pic. 5C
Model BTFS E
G: Gas inlet
C: DHW flow
F: Cold water inlet
M: CH flow
R: CH return
G: Gas inlet
C: DHW flow
F: Cold water inlet
M: CH flow
R: CH return
M1: Low temperature zone flow
M2: Low temperature zone return
D: Flue gas outlet
(130 mm for BTN 25,
150 mm for BTN 32 and BTN 42)

12
S1: CH PROBE
TS: LIMIT THERMOSTAT
V3V: 3-WAY MOTORIZED VALVE
VM: 2-WAY MOTORIZED VALVE
PR: CH PUMP WITH AIR
PURGING
DEVICE
PS: DHW PUMP
F: PRIORITY FLOW METER
SE: EXTERNAL PROBE
(OPTIONAL EQUIPMENT)
VMI: MIXING VALVE
TS1: LOW TEMPERATURE ZONE
SAFETY THERMOSTAT
2.3. Boiler layout
Boiler layout BTN E / BTFS E
Boiler layout BTN EV / BTFS EV
pic. 6
DIE-CAST
HEAT
EXCHANGER
BURNER
Plate heat
exchanger
probe
Zone 1 -
high temperature
Thermostatic
valve
DHW
Cold water inlet
Water tank probe
Water tank
VM (2-way)
Cold water inlet
Zone 1 -
high temperature
Zone 2 -
low temperature
Low temperature zone flow probe
Thermostatic
valve
DIE-CAST
HEAT
EXCHANGER
BURNER
Water storage tank
VM (2-way)
Water storage probe
COLLECTOR
DHW
Plate heat
exchanger
probe
pic. 5D
Model BTFS EV
G: Gas inlet
C: DHW flow
F: Cold water inlet
M: CH flow
R: CH return
M1: Low temperature zone flow
M2: Low temperature zone return

13
BTN 25 BTN 32 BTN 42 BTFS 24 BTFS 32 BTFS 36
Category - II2H3+ II2H3+ II2H3+ II2H3+ II2H3+ II2H3+
Type - B11BS C12 - C32 - C42 - C52 - C82
Number of elements of primary heat exchanger -456344
Number of nozzles of burner -345333
Max heat input kW 27.87 34.80 47.00 26.6 34.4 39.2
Max heat output kW 25.05 31.40 42.54 24.0 32.0 36.5
Max output efciency rate % 89.9 90.22 90.51 90.20 93.10 93.10
Reduced output efciency rate (30% of max output) % 89.0 90.00 89.75 89.23 92.08 92.14
92/42/CEE efciency rating -
Casing heat loss % 0.40 0.50 0.50 2.20 1.90 1.50
Flue gas heat loss with burner on % 9.7 9.28 8.99 7.6 5 5.4
CH min. ow rate l/h 540 690 900 520 690 780
Min. CH water pressure bar 0.8 0.8 0.8 0.8 0.8 0.8
Max CH water pressure bar 3 3 3 3 3 3
Max CH water temperature °C 90 90 90 90 90 90
Min. CH water temperature °C 40 40 40 40 40 40
Capacity of expansion vessel l 12 12 18 12 12 12
Max CH system capacity l 240 240 360 240 240 240
Water content l 16.4 19.8 23 13 16.4 16.4
Water tank capacity l 60 60 60 60 60 60
DHW supply ΔT=30K EN 625 l/10’ 220 242 280 215 245 253
prEN 13203 efciency rating -
Min. DHW ow rate l/min 3 3 3 3 3 3
Min. DHW pressure bar 1 1 1 1 1 1
Max DHW pressure bar 6 6 6 6 6 6
Max DHW water temperature °C 65 65 65 65 65 65
Min. DHW water temperature °C 50 50 50 50 50 50
Capacity of DHW expansion vessel l555555
CH Flow/return pipe diameter inches G1 G1 G1 G1 G1 G1
DHW inlet/outlet pipe diameter inches G3/4 G3/4 G3/4 G3/4 G3/4 G3/4
Gas inlet diameter inches G1/2 G1/2 G1/2 G1/2 G1/2 G1/2
Flue gas pipe diameter mm 130 150 150 -- -- --
Air/ue gas coaxial pipe system diameter mm -- -- -- 100/60 100/60 100/60
Air/ue gas split pipe system diameter mm -- -- -- 80+80 80+80 80+80
Voltage/frequency V/Hz 230/50 230/50 230/50 230/50 230/50 230/50
Power consumption W 160 200 200 200 250 250
Power fuse A444444
Control panel protection rating IP X4D X4D X4D X4D X4D X4D
Height mm 1370 1370 1370 1370 1370 1370
Length mm 600 600 600 600 600 600
Depth mm 800 800 800 800 800 800
Net boiler weight Kg 172 189 206 189 223.5 223.5
2.4. Operational data
Burner pressures must be veried after a three minute boiler operation time

G20 gas
BTN 25 BTN 32 BTN 42 BTFS 24 BTFS 32 BTFS 36
CO2 content % 5.1 4.5 6 7.6 8.3 8.2
Flue gas temperature °C 111 103 121 120/130 110/120 120/130
Flue gas mass ow rate kg/h 101.16 133.56 162 55 67 76
Max output gas consumption stm3/h 2.95 3.7 4.97 2.81 3.64 4.15
Gas pressure mbar 20 20 20 20 20 20
Gas to burner pressure mbar 11.5 9.5 11.5 11 9.5 12
Main burner nozzle diameter mm 2.6 2.6 2.6 2.4 2.9 2.9
Pilot burner nozzle diameter mm 2 x 0.27 2 x 0.27 2 X 0.27 2 x 0.27 2 x 0.27 2 x 0.27
G30 gass
CO2 content % 6.2 5.4 7.1 9.8 9.7 11.1
Flue gas temperature °C 110 105 122 120/130 120/130 120/130
Flue gas mass ow rate kg/h 101.16 133.56 162 55 67 76
Max output gas consumption kg/h 2.2 2.76 3.7 2.1 2.7 3.1
Gas pressure mbar 29 29 29 29 29 29
Gas to burner pressure mbar 26.5 26.5 26.5 26 25.5 26
Main burner nozzle diameter mm 1.55 1.55 1.55 1.5 1.7 1.8
Pilot burner nozzle diameter mm 1 x 0.22 1 x 0.22 1 X 0.22 1 x 0.22 1 x 0.22 1 x 0.22
3. INSTRUCTIONS FOR THE FITTER
14
3.1. Installation standard
The boiler is to be installed in compliance with the country appli-
cable standards, laws and regulations which are intended as fully
transcribed to this manual.
3.2. Installation
3.2.1. Packaging
The boiler is packaged in a strong cardboard box xed by two
screws to a wooden pallet. Once the cardboard box is removed,
check the boiler to be undamaged. The packaging material can be
recycled and it must be disposed of accordingly.
Keep the packaging out of the reach of children as it may re-
present a hazard.
The manufacturer shall not be held liable for injury to persons
and animals or damage to property resulting from non-obser-
vance of the above.
The packaging contains:
- Installation, use and maintenance instruction manual
- Four legs with threads
3.2.2 Choosing where to install the boiler
When choosing where to install the boiler, follow the instructions
below:
- indications in paragraph 3.2.5 Air/ue gas system conguration
- leave a 50 cm clearing on each side of the boiler to facilitate
maintenance operations
- do not install the boiler in a high humidity room
- do not install a natural draught boiler (BTN model) in a corrosive
vapor or dusty air room like hairdressers’, laundrettes etc. as boi-
ler components life span might result considerably shorter than
average,
- Boiler room is not to be accessible by people, children and ani-
mals
3.2.3 Positioning the boiler
Before connecting the boiler to DHW and CH system pipes, clean
the pipes removing any trace of metal from processing and welding
as well as any oil and grease which could damage the boiler or
interfere with its operation.
NB: Do not use solvents which could damage the componen-
ts.
The manufacturer shall be waived from all liabilities for injury to
persons and animals or damage to property resulting from non-
observance of the above.
In order to install the boiler, after laying it where is to be positioned,
proceed as follows:
- detach the front panel
- detach the two screws xing it to the wooden pallet (pic. 7A)
- In order to remove the boiler from the wooden pallet it is neces-
sary to raise it: proceed carefully and delicately. Insert two 2” thick
metal bars in the openings under the boiler chassis which supports
the heat exchanger (pic. 7B), raise the boiler avoiding to damage
the hydraulic connections and position it on the ground.
- x the four threaded legs to the boiler and adjust them for best
installation stability;
- connect the boiler to CH ow, CH return, cold water network,
DHW ow, and gas network pipes
- connect the boiler to air and gas ue pipes as needed
- connect the boiler electronics to the room thermostat (when avai-
lable)
- connect the boiler to the power main supply

3.2.4. Boiler room ventilation
The boiler is to be installed in an adequate room according to law
requirements, which are considered as fully transcribed in this ma-
nual.
BTN, open combustion chamber boiler model is to be connected
to a chimney system: combustion air is taken from the boiler room.
An air replenishment opening is to be provided according to law
requirements.
BTFS, sealed combustion chamber boiler model does not take
combustion air from the boiler room, therefore no air replenishment
opening is to be provided.
3.2.5. Air/ue gas system conguration
As far as ue gas system exhaust to the atmosphere is concerned,
comply with current laws which are considered as fully transcribed
in this manual.
NATURAL DRAUGHT BOILER (BTN)
BTN boiler model is equipped with a ue gas coupling which is rea-
dy to be connected to a ue gas exhaust system, which diameter is
specied in the technical data tables.
As far as ue gas system exhaust to the atmosphere is concerned,
comply with current laws which are considered as fully transcribed
in this manual.
The ue gas pipe is to be connected to a chimney system in com-
pliance with current laws which are considered as fully transcribed
in this manual.
The following mandatory requirements for air/ue gas system ducts
are to be followed:
- Their diameter is not to be not less than that of the boiler outlet.
- They are to be made of water proof material that can withstand
ue gas temperature and related acid condensate.
- They are to have low thermal conductivity, sufcient mechanical
strength, be properly sealed, and bear proper height and cross-
section dimensions.
- The vertical inclination (chimney system) and section are to be
constant, without any bottlenecks.
- Where horizontal ue gas pipe are installed, these must bear an
inclination toward the ground of at least 5%.
- The terminal is to ensure efcient, constant evacuation of ue gas
in any weather condition.
- The ue gas terminal is to stand at least 0.5 m above any adjacent
structure within a 5 m radius.
FORCED DRAUGHT BOILER (BTFS)
BTFS boiler model is equipped with air and ue gas couplings whi-
ch are to be connected to 80mm diameter pipes.
As far as ue gas system exhaust to the atmosphere is concerned,
comply with current laws which are considered as fully transcribed
in this manual.
Type C12
This boiler is designed for horizontal air/ue gas terminals, con-
nected to the outside by means of a coaxial or split pipe system.
The distance between the air intake pipe and the ue gas exhaust
pipe is to be at least 250 mm and both terminals are to be posi-
tioned within a square having sides of 500 mm.
• Air / flue gas coaxial pipe system, 60/100 mm diameter.
Allowable configuration:
1 flanged stub pipe
3 meter long coaxial pipe
1 air/flue gas terminal.
Notes:
- Reduce the maximum length by 1 meter for each 90° elbow.
- Reduce the maximum length by 0.5 meter for each 45° elbow.
- BTFS 24 model: in installations with an equivalent length of less
than 1 meter, install a 75 mm diaphragm.
- BTFS 32 model: in all installations, install a 78 mm diaphragm.
- BTFS 36 model: in installations with an equivalent length of less
than 1 meter, install a 78 mm diaphragm.
• Air / flue gas 80 mm diameter split pipes
Allowable configuration:
2 flanged stub pipes
19 meter long air intake pipe
19 meter long flue gas pipe
1 air intake terminal
1 flue gas terminal
Notes:
- Reduce maximum length by 1 meter for each 90° elbow.
- Reduce maximum length by 0.5 meter for each 45° elbow.
- BTFS 24 model: for installations with an equivalent length of less
than 2+2 meters, install a 42 mm diaphragm on the air intake.
- BTFS 32 and BTFS 36 models: for installations with an equiva-
lent length of less than 9+9 meters, install a 40 mm diaphragm on
the air intake.
pic. 7A
pic. 7B
PRE-ARRANGED
OPENINGS
SCREWS
15

Type C32
This boiler is designed for vertical air/ue gas terminals, connected
to the outside by means of coaxial or split pipes.
The distance between the air intake pipe and the ue gas pipe is
to be at least 250 mm and both terminals
are positioned within a square having 500 mm sides.
• Air / flue gas coaxial pipe, 60/100 mm diameter.
Allowable configuration:
1 flanged stub pipe
4 meter long coaxial pipe
1 air/flue gas roof terminal.
Notes:
- Reduce maximum length by 1 meter for each 90° elbow.
- Reduce maximum length by 0.5 meter for each 45° elbow.
• Air / flue gas 80 mm diameter split pipes
Allowable configuration:
2 flanged stub pipes
19 meter long air intake pipe
19 meter long flue gas pipe
1 air intake terminal
1 flue gas terminal
Notes:
- Reduce maximum length by 1 meter for each 90° elbow.
- Reduce maximum length by 0.5 meter for each 45° elbow.
- BTFS 24 model: in installations with an equivalent length of less
than 2+2 meters, install a 42 mm diaphragm on the air intake.
- BTFS 32 and BTFS 36 models: in installations with an equivalent
length of less than 9+9 meters, install a 40 mm diaphragm on the
air intake.
Type C42
This boiler is designed for a collective ue gas exhaust system
consisting of two pipes, one for air intake and the other for ue gas,
by means of a coaxial or split pipes.
The collective flue gas exhaust system must comply with
current laws.
• Air / flue gas 80 mm diameter split pipes
Allowable configuration:
2 flanged stub pipes
2 meter long air intake pipe
2 meter long flue gas pipe
Notes:
- Reduce maximum length by 1 meter for each 90° elbow.
- Reduce maximum length by 0.5 meter for each 45° elbow.
- BTFS 24 model: install a 42 mm diaphragm on the air intake.
- BTFS 32 and BTFS 36 models: install a 40 mm diaphragm on
the air intake.
Type C52
This boiler is to be connected to a split pipe system.
The pipes can operate at different pressure. Terminals cannot
be placed on walls facing each other.
• Air intake/ flue gas 80 mm diameter split pipes
Roof mounted flue gas terminal.
Allowable configuration for max length of split pipes:
2 flanged stub pipes
1 meter long air intake pipe
30 meter long flue gas pipe
1 air intake terminal
1 roof-mounted smoke flue terminal
Notes:
- 1 meter of air intake pipe is equivalent to 2 meters of vertical
flue gas pipe.
- Reduce maximum length by 1 meter for each 90° elbow.
- Reduce maximum length by 0.5 meter for each 45° elbow.
-BTFS 24 model: in installations with an equivalent vertical flue
gas pipe length, less than 18 meters, install a 40 mm diaphragm
on the air intake.
- BTFS 32 and BTFS 36 models: in installations with an equiva-
lent vertical flue pipe length, less than 4 meters, install a 42 mm
diaphragm on the air intake.
Wall-mounted flue gas pipe
Allowable configuration for max length of split pipes:
2 flanged stub pipes
19 meter long air intake pipe
19 meter long flue gas pipe
1 air intake terminal
1 flue gas terminal
Notes:
- 1.6 meters long air intake pipe is equivalent to 1 meters hori-
zontal flue gas pipe.
- Reduce maximum length by 1 meter for each 90° elbow.
- Reduce maximum length by 0.5 meter for each 45° elbow.
- BTFS 24 model: in installations with an equivalent length of less
than 9+9 meters, install a 40 mm diaphragm on the air intake.
- BTFS 32 and BTFS 36 models: in installations with an equiva-
lent length of less than 2+2 meters, install a 42 mm diaphragm
on the air intake.
Type C82
This boiler is designed to be connected to a terminal for intaking of
combustion air and an individual or collective flue gas system.
The flue gas system is to comply with current standards.
• Air / flue gas 80 mm diameter split pipes
Allowable configuration for max length of split pipes:
2 flanged stub pipes
4 meter long air intake pipe
1 meter long flue gas pipe
1 air intake terminal
Notes:
- 1.6 meter long air intake pipe is equivalent to 1 meter long hori-
zontal flue gas pipe.
- Reduce maximum length by 1 meter for each 90° elbow.
- Reduce maximum length by 0.5 meter for each 45° elbow.
- BTFS 24 model: install a 42 mm diaphragm on the air intake.
- BTFS 32 and BTFS 36 models: install a 40 mm diaphragm on
the air intake.
16

3.2.6. Verifying combustion efciency
In order to determine combustion efciency, the following measure-
ments are to be performed:
- combustion air temperature
- ue gas temperature and CO2concentration, from the relevant
opening on the ue gas pipe.
Perform the above measurements when the boiler has reached
working temperature.
3.2.7. Gas main connection
Gas supply pipe section must be equal or larger than boiler’s.
The applicable section of the pipe depends on its length, path, and
ow rate. Its section is to be calculated.
Refer to applicable installation standards and laws. They shall
be considered as incorporated in full in this manual.
An internal, brand new gas supply network, before supplying
any gas or being connected to the gas meter, is to checked
for leaks.
When sections of the network are concealed, the leak test
must be carried out prior to covering the pipes.
The leak test must not be conducted using fuel gas: use air
or nitrogen.
When gas is owing through the pipes, gas leaks should ne-
ver be detected using an open ame device.
Use appropriate products, readily available on the market.
3.2.8. Power main connection
The boiler is to be connected to a 230V-50Hz power main supply
via a triple-poled wiring (not included).
The wires are to be connected to position 5 (EARTH), 6(PHASE),
and 7(NEUTRAL) of Mterminal board in picture 9 (BTN E and
BTFS E models), or to position 12 (EARTH), 13 (PHASE), and 14
(NEUTRAL) of Mterminal board in picture 10 (BTN E V and BTFS
E V models).
Verify phase, neutral and ground connections are correctly perfor-
med, following the instructions in this manual.
When installing the boiler, comply with applicable standards which
shall be considered fully incorporated to this manual.
A bipolar switch, with 3 mm minimum distance between the con-
tacts, in an easy to reach position, must be installed externally
to the boiler to enable interruption of power supply and to ensure
maintenance operations to be carried out safely.
The power main line to the boiler must be protected by a differential
thermal-magnetic switch with the adequate interruption power.
Power mains is to be properly earthed.
The above instruction is an indispensable safety requirement and
is to be veried prior to operating the boiler; in case of doubt, ask
for a professionally qualied technician to check the electrical sy-
stem.
The manufacturer shall not be held liable for damage or injury cau-
sed by failure to properly earth the power main.
Gas lines, DHW and CH pipes are not suitable for earthing purpo-
ses.
3.2.9. Hydraulic connections
Before connecting the boiler it is advisable to clean the pipes in
order to remove any alien material that could damage boiler com-
ponents such as pump and heat exchanger.
CENTRAL HEATING
Central heating ow and return must be connected to their relevant
1” connections, marked M and R in pic. 5 and 5B).
When size dimensioning central heating pipes, it is necessary to
consider load losses induced by radiators, presence of thermosta-
tic valves, radiator cut-off valves and general conguration of the
central heating system.
It is advisable the discharge of the safety valve to be conveyed
into the sewer.
If this precaution is not taken, activation of the safety valve
may result in ooding of the room where the boiler is instal-
led.
The Manufacturer shall not be held responsible for damage
caused by omission of the above mentioned technical precau-
tion.
DOMESTIC HOT WATER
DHW ow and water main inlet pipes must be connected to the their
3/4” connections, marked Cand F(pic. 5A and pic. 5B).
Hardness of water increases frequency of service to the secondary
plate heat exchanger.
WARNING
Should water hardness be far above average, it is advisable to
install a water softener device.
Water showing 20°F or more hardness should be treated.
WARNING
Due to its pH value, water supplied from normal water softe-
ners may not be compatible with some components of the hea-
ting system.
3.2.10. Room thermostat connection
The boiler can be connected to a room thermostat: its contacts
must be properly sized in consideration of a 5 mA load at 24
Vdc.
Room thermostat wirings must be connected to positions 1and 2
of Mterminal board shown in pic. 9 (BTN E and BTFS E models),
after removing the jumper supplied as standard to the boiler.
Room thermostat wires are NOT to be grouped together with power
main supply cables.
BTN E V and BTFS E V models can be connected to two room
thermostats: one managing a high temperature CH area to no. 8
and no. 9positions of Mterminal board, one managing a low tem-
perature CH area to no. 6and no. 7positions of Mterminal board.
3.2.11. Adjustable by-pass
The boiler is equipped by an adjustable by-pass (located on the
three-way motorized valve hydraulic assembly). By-pass operation
can also be inhibited.
Pic. 8A shows the adjusting by-pass screw, set for by-pass opera-
tion preclusion, pic. 8B shows the adjusting by-pass screw set for
by-pass operation.
pic. 8
A
B
Closed
by-pass
Open
by-pass
17

3.2.12. Installation of original kits
The manufacturer provides original kits for thermoregulation con-
trol unit installation.
The kits are to be installed as described in their relevant instruction
manuals.
3.3. Loading the system
After completion of all hydraulic connections the central heating
system is ready for loading.
Water lling procedure must be performed as follows:
- open air purging valves on the radiators and check operation of
the boiler automatic air purging valve
- gradually open the boiler water main inlet tap and check operation
of all air purging valves in the system
- close the air purging valves on the radiators as soon as water
comes out
- check the water pressure gauge on boiler, its reading is not to
exceed 1-1.3 bars
- close the water main inlet tap and purge any air still in the system
through the radiator valves
- turn the boiler on and wait for the CH system to reach working
temperature. Stop the pump and purge any left air
- allow the CH system to cool and adjust water pressure to 1-1.3
bars.
WARNING
For best performance, safe, trouble-free and long lasting opera-
tion of boiler and its components, in order to minimise energy con-
sumption, thus complying with standards and laws, it is essential to
treat the water using specic products compatible with multi-metal
systems.
Note
The boiler is equipped, in its front lower section, with a tap for
unloading water from the system.
WARNING
A low water pressure safety switch prevents burner to ignite when
water pressure is lower than 0.4 / 0.6 bar. Water pressure in the
central heating system should not be lower than 1-1.3 bar; resto-
re correct pressure through water mains inlet tap on the boiler as
necessary.
Water pressure adjustment must be performed when the system
is cold. The thermo-manometer gauge on the boiler allows for che-
cking the pressure in the system.
IMPORTANT:
After a period of inactivity the pumps could be blocked.
Before switching on the boiler it may be necessary to unlock
the pumps as follows: loosen the protective screw on the
pump motor housing, insert a screwdriver in the hole and then
manually rotate the pump shaft clockwise.
After restoring pump operation, tighten the protective screw
and check for water leaks.
WARNING
When removing the pump protective screw a little water may
leak out. Before replacing the cover of the boiler dry any wet
surfaces.
3.4 Starting the boiler
3.4.1 Preliminary checks
Prior to starting the boiler verify the following:
- correct installation of ue gas outlet duct and terminal section:
when the boiler is operating, no ue gas leaks are to be
detected.
- power supply to the boiler must be 230 V- 50 Hz;
- system is correctly lled with water (manometer reading is to be
1-1.3 bars);
- any cut-off taps in the system are to be open;
- the gas type supplied matches the gas type for which the boiler
has been calibrated: otherwise, convert the boiler to the gas type
available (see section 3.6: “SWITCHING TO DIFFERENT GAS
AND BURNER ADJUSTMENT“): this operation is to be performed
by qualied technicians;
- the gas supply tap is open;
- no gas leaks are detected;
- the power switch external to the boiler is on;
- no water leaks are detected
- the pumps are not blocked
- the boiler’s safety valve is not locked;
WARNING
The boiler pump is factory set to III speed and the by-pass is closed.
Adjust them following the system requirements.
3.4.2 On/Off switching
To switch the boiler on and off follow the indications in the “In-
structions to the user”.
18

3.5. Wiring diagrams
Model BTN E
Model BTFS E
M: TERMINAL BOARD FOR CONNECTION TO POWER MAINS, EXTERNALTEMPERATU-
RE PROBE, ROOM THERMOSTAT
M6: TELEMETRY CONNECTION
M1- M24: AVAILABLE CONNECTORS
TA: ROOM THERMOSTAT
SE: 10k Ohm B = 3977 EXTERNAL TEMPERATURE PROBE (OPTIONAL EQUIPMENT)
CT: PHONE CONNECTION DEVICE (OPTIONAL EQUIPMENT)
FUSE: 2AF 250 VAC FUSE
P4: CH CURVE SELECTION POTENTIOMETER
P3: BOILER OPERATING MODE SELECTOR
P2: DHW TEMPERATURE ADJUSTING POTENTIOMETER
P1: CH TEMPERATURE ADJUSTING POTENTIOMETER
IG: TWO-POLED MAIN POWER SWITCH
BC: FLAME DETECTION PCB
VG: GAS VALVE
E. RIV: FLAME DETECTION ELECTRODE
E. ACC: IGNITION ELECTRODE
PSB: RESET BUTTON
TS: SAFETY THERMOSTAT
TF: FLUE GAS THERMOSTAT
DK: LOW WATER PRESSURE SAFETY SWITCH
FL: FLOW METER
PR: RECIRCULATION PUMP
PS: DHW PUMP
EV: TWO-WAY WATER TANK INTERCEPTING VALVE
MVD: THREE-WAY MOTORIZED VALVE
TIMER: TIMER
SB: 10k Ohm B = 3435 WATER TANK PROBE
SR: 10k Ohm B = 3435 CH PROBE
SS: 10k Ohm B = 3435 DHW PROBE
pic. 9
19