Fondital CAPRI B Quick start guide

CAPRI B/R
IST 03 C 217-01
INSTALLATION,
USE AND MAINTENANCE
GB

Dear Customer,
thank you for choosing our boilers. Please read these installation, use and maintenance instructions with care.

This INSTRUCTION MANUAL, which
is an integral and indispensable part of
the product, must be handed over to
the user by the installer and must be
kept in a safe place for future referen-
ce. The manual must accompany the
boiler should it be sold or moved.
This boiler must be used for the pur-
pose for which it has been designed.
Any other use is considered incor-
rect and therefore dangerous.
The boiler must be installed in com-
pliance with applicable laws and stan-
dards and according to the manufactu-
rer’s instructions given in this manual.
Incorrect installation may cause injury
or damage to people, animal, or pro-
perties, for which the manufacturer
shall not be held liable.
Damage or injury caused by incorrect
installation or use or failure to observe
the enclosed instructions shall relie-
ve the manufacturer of all liabilities
whether under a contract or not.
Before installing the boiler, check that
its specifications meet the requiremen-
ts of the system in which it is to be
installed.
Check that the boiler is intact and
that it has not been damaged during
transport and handling. Do not install
equipment which is clearly damaged
or faulty.
Do not obstruct the air intake and / or
flue gas exhausting grates.
Only original accessories must be used
for all boilers supplied with options or
kits (including electrical ones).
All the packaging materials can be
recycled and should be sent to specific
waste management sites.
Keep the packaging out of the reach
of children as it constitutes a serious
hazard.
In the event of a malfunction, switch off
the boiler immediately. Do not attempt
to make any repairs and contact a qua-
lified technician.
Original parts must be used for all
repairs to the boiler.
Failure to do this may jeopardize the
safety of the boiler and create a serious
hazard to people, animal, or proper-
ties.
It is necessary to service the boi-
ler periodically, according to the
schedule indicated in the appli-
cable section of this manual.
Correct maintenance allows for
efficient and correct functioning
of the equipment, granting the
better working conditions, opti-
mizing performance and safety
for people, animals, things and
environment.
When the boiler is not used for a pro-
longed period, switch off the electricity
and fuel supply (Warning! The electro-
nic anti-freeze function will not ope-
rate). Place some calcium carbonate
inside the heat exchanger to absorb
moisture.
Should there be a risk of freezing,
add anti-freeze. It is not advisable to
empty the system as this may result
in damaging the system. Use a speci-
fic anti-freeze for multi-metal heating
systems.
WARNING
The boiler has been designed for
installation only in the country indi-
cated on the rating plate: installa-
tion in any other country may cause
injury or damage to people, animals
and/or properties.
General information for installers, service engineers and users

4 5
General information for installers, service engineers and users page 3
1 Instructions for the user page 5
1.1 Control panel page 5
1.2 How the heating unit operates page 6
1.2.1 Start-up page 6
1.2.2 Operation page 6
1.2.2.1 Management of a heating unit serving an high temperature CH zone + DHW supply (B and R models) page 6
“Timer” position page 6
“Comfort” position page 6
“Night” position page 6
“Anti-frost” position page 6
“Summer” position page 7
CENTRAL HEATING page 7
EXCHANGER TEMPERATURE HOLDING page 7
DOMESTIC HOT WATER page 7
ANTI-FROST page 7
PUMP ANTI-BLOCKING page 7
ANTI-LEGIONELLA page 7
EXCESSIVE HEAT MANAGEMENT page 7
POST-CIRCULATION page 8
1.2.2.2 Management of a heating unit serving a mixed water CH zone, an high temperature CH zone + DHW supply (BV and RV models) page 8
“Timer” position page 8
“Comfort” position page 8
“Night” position page 8
1.2.2.3 “SLIDING TEMPERATURE” operation page 8
1.2.3 Electronic timer programming page 10
1.2.4 “OPEN THERM” remote control programming page 11
1.2.5 Heating unit shutdown page 12
1.2.5.1 Burner shutdown page 12
1.2.5.2 Shutdown due to overheating page 12
1.2.5.3 Shutdown due to low water pressure page 12
1.2.5.4 Shutdown due to malfunction of temperature probes page 12
1.3 Maintenance page 13
1.4 Information for the user page 13
2 Technical features and dimensions page 13
2.1 Technical features page 13
2.2 Dimensions page 14
2.3 Heating unit layout page 15
2.4 Technical data of the heating units page 16
2.5 Technical data of the burner page 16
3 Instructions for the installer page 17
3.1 Installation regulations page 17
3.2 Installation page 17
3.2.1 Packaging page 17
3.2.2 Choosing where to install the heating unit page 17
3.2.3 Installing the heating unit page 17
3.2.4 Connection to the fuel oil mains supply page 17
3.2.5 Room ventilation page 17
3.2.6 Air intake and flue gas discharge system page 17
3.2.7 Measuring combustion efficiency page 19
3.2.8 Connecting to the power mains page 19
3.2.9 Hydraulic connections page 19
3.2.10 Room thermostat connection page 19
3.2.11 “OPEN THERM” remote control installation (option) page 20
3.2.12 External probe installation page 20
3.3 Filling up the heating system page 20
3.4 Starting up the heating unit page 20
3.4.1 Preliminary checks page 20
3.4.2 Switching on and off page 20
3.4.3 Burner adjustment page 20
3.5 Electric diagrams page 21
4 Oil burner page 29
4.1 Description page 29
4.2 Installing the burner on the heating unit page 29
4.3 Hydraulic system page 29
4.4 Combustion adjustment page 30
4.5 Removing the nozzle page 30
4.6 Adjusting the electrodes page 30
4.7 Replacing the control unit page 31
4.8 Burner ignition cycle page 31
4.9 Wiring diagram page 32
4.10 Burner trouble-shooting page 33
5 Testing the heating unit page 34
5.1 Preliminary checks page 34
5.2 Switching on and off page 34
6 Maintenance page 34
6.1 Maintenance schedule page 34
7 Heating unit trouble-shooting page 35
CONTENTS

4 5
1. Signal light (red): when the light is ON the burner was shutdown
due to lack of flame.
Resume heating unit operation by pressing the burner reset button
(pic.4).
2. Signal light (red): the red led shows activation of the safety thermo-
stat. The burner is turned OFF. The heating unit will resume operation
once the safety thermostat reset button 17 is pressed (remove the
protective cap to access the button).
3. Signal light (green): the green led is ON and fixed when power is
supplied to the burner (regardless of flame presence).
4. Signal light (red): the led is ON and fixed when the temperature of
the heating water is between 25° and 35°C. When the led is flashing
the pressure switch has detected low water pressure in the system.
The heating unit and the pumps are turned OFF. As soon as correct
water pressure is restored, the pressure switch will give the ok for ope-
ration, the led will turn OFF and the heating unit will switch ON again.
5. Signal light (red): the led is ON and fixed when the temperature of
the heating water is between 36° and 45°C. When the led is flashing
the temperature probe 1 (flow) is faulty (interrupted or out of range).
The burner is turned OFF while the pumps keep running. As soon as
the faulty probe is replaced, the led will turn OFF and the heating unit
will resume normal operation. When signal lights 4 and 5 flash simul-
taneously, the external probe (standard in BV and RV models) is faulty
or disconnected. As soon as the probe malfunction is solved the lights
will turn OFF.
6. Signal light (red): the led is ON and fixed when the temperature of
the heating water is between 46° and 55°C. When the led is flashing it
indicates the connection between the “OPEN THERM” remote control
(option) and heating unit is interrupted or malfunctioning.
As soon as correct connection is restored, the led will turn OFF and the
heating unit will resume normal operation.
7. Signal light (red): the led is ON and fixed when the temperature of
the heating water is between 56° and 65°C. When the led is flashing (B
and BV models only) the temperature probe 2 (cylinder) is faulty (inter-
rupted or out of range).The heating unit keeps operating in CH mode
(DHW supply is halted).
As soon as the faulty probe is replaced the heating unit will resume
normal operation.
8. Signal light (red): the led is ON and fixed when the temperature of
the heating water is between 66° and 75°C.
9. Signal light (red): the led is ON and fixed when the temperature of
the heating water is between 76° and 85°C. When the led is flashing
the temperature has exceeded 85°C.
10. Signal light (green): the green led is ON and fixed when the hea-
ting unit is operating in central heating mode.
11. Heating unit mode knob: the knob allows for choosing the
desired heating unit operating mode (refer to paragraphs from 1.2.2
to 1.2.2.3).
12a. Cylinder operation light: when the led is ON the cylinder is
operating, vice-versa when the led is OFF.
12b. DHW supply adjusting knob: The knob manages DHW mode of
the heating unit (R and RV models, only when connected to an optional
external cylinder). Refer to paragraphs from 1.2.2 to 1.2.2.3.
13a. EXCHANGER TEMPERATURE HOLDING light: the led is ON
when the function is activated and vice-versa.
13b. CH temperature adjusting knob: the knob allows for mana-
gement of CH water temperature (refer to paragraphs from 1.2.2 to
1.2.2.3).
14. Water pressure gauge: the gauge shows water pressure in the
CH system.
15. Digital programmable timer (standard on BV and RV models,
optional for R and B models ): the timer allows for management of
operation periods of the heating unit in CH and DHW modes (refer to
paragraphs from 1.2.2 to 1.2.4).
16. ON/OFF button: when the button is positioned to I, power is sup-
plied to the heating unit and the button light is ON; when the button
is positioned to O, power is not supplied to the heating unit and the
button light is OFF.
17. Reset button: press the button to resume heating unit operation
when the safety thermostat has shut it down (remove the plastic cap
to access the button). Prior to resume operation, allow the heating unit
to cool down below 70°C.
1. INSTRUCTIONS FOR THE USER
1.1. Control panel
00:00
pic. 1
1 2 3 4 5 6 7 8 9 10 11 12b 14 15 OPTIONAL
16 17
12a 13a 13b

1.2. How the heating unit operates
1.2.1. Start-up
- Turn on the fuel tap;
- turn the power switch external to the heating unit to ON;
- turn the heating unit main switch 16 (pic.1) to ON (the switch
lights up);
- select the heating unit operating mode through knobs 11, 12
and 13, and the programmable timer when installed (refer to
1.2.2 paragraphs from 1.2.2 to 1.2.3);
- set desired room temperature through the room thermostat
(when available);
- when the system requires heat, CH request led 10 (pic.1)
comes on;
- when the burner is ON, led 3 is on (the light turns on when
electric power is supplied to the burner, and it does not
necessarily indicates that a flame is present).
N.B.
On models 23 and 33 the burner is equipped with an oil pre-
heating device (always active). Therefore a waiting time of
up to three minute might be necessary prior to actual flame
presence, depending on the temperature of the oil.
In B and BV models and R and RV models equipped with
external cylinder (optional equipment), the DHW supply and
temperature maintenance function has always priority over
CH function
1.2.2. Operation
Heating units are divided into two main families:
a) heating unit serving an high temperature CH zone + DHW
supply (B and R* models);
b) heating unit serving a mixed water CH zone, an high tempe-
rature CH zone + DHW supply (BV and RV* models)
1.2.2.1. Management of a heating unit serving an high tem-
perature CH zone + DHW supply (B and R models)
(*) In R and RV models, DHW supply and related functions
are operated only when an external cylinder is connected
(optional equipment), for which the ANTI-LEGIONELLA fun-
ction is not active.
Set button 16 to position I: power is supplied to the heating unit
and the button light is ON.
Knob 11 is to select the heating unit operation mode. In detail:
“timer” position ( to be used when programmable timer 15
is installed).
All functions are active: (CH, DHW (*), ANTI-FROST, PUMP ANTI-
LOCKING, ANTI-LEGIONELLA).
In this position the heating unit operates following the programs
of the two channel programmable timer 15. The user manages
CH through channel 1 (see CENTRAL HEATING); The user ma-
nages DHW supply through channel 2 (see DOMESTIC HOT WA-
TER);
- CHANNEL 1 without external probe
When the contact is OFF, CH is OFF. When the contact is ON,
CH is managed through the room thermostat.
- CHANNEL 1 with external probe
See 1.2.2.3 “SLIDING TEMPERATURE” paragraph operation.
- CHANNEL 2
When the contact is OFF, DHW production is not active, DHW
is supplied at domestic cold water network temperature. When
the contact is ON, the cylinder is kept to the temperature set by
knob 12b (B and BV models), or through the adjustable thermo-
stat on the cylinder. Temperature range is 35°C – 65° C in B and
BV models, in R and RV models it is depending on the type of
cylinder (optional equipment).
The programmable timer 15 allows for setting of up to 8 ON daily
programs and 8 OFF daily programs.
Detailed programmable timer setting procedure is available in
1.2.3 paragraph.
N.B.
When neither the programmable timer nor the external pro-
be are installed, the position manages the “Summer”
function (see below).
When the programmable timer is not available, and the ex-
ternal probe is installed, the position manages the “night”
function (see below).
“Comfort” position.
All functions are active: (CH, DHW (*), ANTI-FROST, PUMP ANTI-
LOCKING, ANTI-LEGIONELLA).
Channel 1 of the programmable timer (when available) is con-
sidered always ON regardless of the set program, therefore CH
function is managed by the room thermostat or thermoregula-
tion control unit (when they are available).
Detailed information about “Comfort” position with external
probe are available in 1.2.2.2 paragraph “Management of a hea-
ting unit serving an high temperature CH zone + DHW supply (B
and R models)” and 1.2.2.3 paragraph “SLIDING TEMPERATU-
RE” operation.
DHW (*) function is managed through knob 12b, by the adjusta-
ble thermostat on the cylinder (R and RV models), and by chan-
nel 2 of the programmable timer (see above described “timer”
position ).
“Night” position.
When the external probe is not installed, the position mana-
ges the “Summer” function (see below).
The “Night” position is active when an external probe is
installed (see 1.2.2.2 paragraph “Management of a heating
unit serving an high temperature CH zone + DHW supply (B
and R models) and 1.2.2.3 paragraph ”SLIDING TEMPERA-
TURE” operation.
CH function is not active. DHW (*), ANTI-FROST, PUMP ANTI-
LOCKING, ANTI-LEGIONELLA functions are active.
Channel 1 of the programmable timer (when available) is consi-
dered always OFF regardless of the set program, therefore CH
mode is always off in spite of a CH request from the room
thermostat or thermoregulation control unit (when they are avai-
lable).
DHW(*) is set by knob 12b (B and BV models), or via the adju-
stable thermostat on the cylinder, and by channel 2 of the pro-
grammable timer (see above information about “programmable
timer” ).
“Anti-frost” position.
Active functions are: ANTI-FROST, PUMP ANTI-LOCKING,
ANTI-LEGIONELLA. The thermal unit is in stand-by mode.
CH flow anti-frost: when the probe detects a temperature below
5°C, the heating unit is turned on until CH flow temperature rea-
ches 50°C or 15 minutes have elapsed.
DHW flow anti-frost (active in B and BV models only): when the
cylinder probe detects a temperature below 5°C, the heating
unit is turned on until the cylinder water temperature reaches
10°C or 15 minutes have elapsed.
6 7

“Summer” position.
CH function is not active. DHW (*), ANTI-FROST, PUMP ANTI-
LOCKING, ANTI-LEGIONELLA functions are active.
CH requests are not satisfied.
Knob 12b, and the adjustable thermostat on the cylinder, when
available (R and RV models) manage DHW production (*) ( see
DOMESTIC HOT WATER (*)).
CENTRAL HEATING
CH management board adjusts CH water temperature between
50°C and 90°C depending on the user setting of knob 13b (pic.1).
CH mode is activated when it is requested by channel 1 (ON) of
the programmable timer (when available) and at the same time the
contacts of the room thermostat (when available) are closed; such
request terminates when one of the two contacts opens or DHW
supply is needed.
Furthermore, when a room thermostat is available, the user can set
a fictitious room temperature by acting on knob 13b (see1.2.2.3
paragraph ”SLIDING TEMPERATURE” operation).
EXCHANGER TEMPERATURE HOLDING
The function is active in R and RV models, only when connected
to an external cylinder (optional equipment).
Knob 13b, in addition to setting flow temperature, allows for
EXCHANGER TEMPERATURE HOLDING activation.
When the EXCHANGER TEMPERATURE HOLDING function is ON
(led 13a is off), the heat exchanger, when CH or DHW are not
requested, is kept at 50°C in order to expedite DHW production.
When the EXCHANGER TEMPERATURE HOLDING function is
OFF (led 13a is off), the heat exchanger, when CH or DHW are
not requested, is left to cool down.
Follow the instructions below in order to activate/deactivate the
EXCHANGER TEMPERATURE HOLDING function:
- fully turn 13b knob counter-clockwise;
- wait 2 seconds for led 13a to change from ON to OFF or vice-
versa, indicating the chosen function (see above);
- now fully turn 13b knob clockwise in order to set flow water
temperature.
N.B.
The EXCHANGER TEMPERATURE HOLDING function is acti-
vated regardless of selector 11 position.
The EXCHANGER TEMPERATURE HOLDING function, even
when activated, is not turned on when the cylinder is deacti-
vated (via the adjusting knob 12b or the programmable timer,
when available).
Should DHW be frequently requested, the manufacturer re-
commends the EXCHANGER TEMPERATURE HOLDING func-
tion to be deactivated, and the cylinder always ON.
DOMESTIC HOT WATER
The function is active in R and RV models, only when connected
to an external cylinder (optional equipment).
DHW supply has priority over every other function. The user can
adjust DHW parameters through knob 12b, the adjustable ther-
mostat on the cylinder (R and RV models), and channel 2 of the
programmable timer 15 when available. DHW temperature adju-
sting range is from 35°C to 65°C for B and BV models, in R and
RV models it is depending on the connected cylinder /optional
equipment).
Specifically, by acting on knob 12b, it is possible to activate/deac-
tivate the cylinder:
- led 12a indicates the boiler is active. The unit heats the cylin-
der up to the temperature set via knob 12b (B and BV models) or
via the adjustable thermostat on the cylinder when a cylinder was
installed (R and RV models) and allows for available DHW from the
cylinder upon request.
- When led 12a is OFF, it indicates the cylinder is not active.
The function allows not to heat up the cylinder during period it is
not necessary, and save fuel. Should DHW be requested, it will be
supplied at domestic cold water network temperature.
In order to activate or deactivate the cylinder, proceed as follows:
- fully turn 12b knob counter-clockwise;
- wait 2 seconds for led 12a to change from ON to OFF or vice-
versa, indicating the desired function
- now fully turn 12b knob clockwise (B and BV models) or the
adjustable thermostat on the cylinder (R and RV model) in order to
set DHW temperature.
N.B.
When a programmable timer is installed on the heating unit, the
cylinder is heated only in the periods which are programmed ON
via channel 2 (see 1.2.3 paragraph for programmable timer set-
ting) and the “cylinder active” function is ON (led 12a is ON).
When the boiler is deactivated (led 12a is OFF), the cylinder is
not heated up, regardless of the programmable timer setting.
ANTI-FROST
Anti-frost function is active in any position of the selecting knob 11:
- when the flow temperature goes below 5°C, the control board
ignites the burner and CH pump until flow reaches 50°C, or, when
50°C are not reached, for 15 minutes;
- in B and BV models, when cylinder water temperature goes be-
low 5°C, the control board ignites the burner and DHW pump until
water temperature reaches 10°C, or, when 10°C are not reached,
for 15 minutes. CH flow in this instance is brought to 50°C.
PUMP ANTI-BLOCKING
In case CH or DHW are not required, every 24 hours, CH and DHW
pumps are activated for 180 seconds in order to avoid blockage.
ANTI-LEGIONELLA
The function is available in B and BV models only.
Every 15 days the anti-Legionella function is activated; it consists
in heating the cylinder water up to 65°C for 30 minutes, in order to
prevent or eliminate possible bacteria in the cylinder
EXCESSIVE HEAT MANAGEMENT
When flow temperature exceeds 91°C, the pumps are turned on to
avoid exchanger overheating. In detail:
- In R and RV models excessive heat management acts on CH cir-
cuit, and its pump stays on until water temperature goes below 90°C.
Then the pump runs for three additional minutes and turns off;
- In R and RV models equipped with cylinder, and in B and BV
models:
a) should the heating unit be in post-circulation mode, CH circuit
excessive heat is managed by operating the CH pump until water
temperature goes below 90°C. After that the pump runs for three
additional minutes and turns off;
b) should the heating unit not be in post-circulation mode, exces-
sive heat is managed through the cylinder by operating the DHW
pump until water temperature goes below 90°C. After that the
pump runs for three additional minutes and turns off;
6 7

POST-CIRCULATION
Once CH, DHW or anti-frost operation is over, the burner, when
ON, is turned OFF, while the pump (CH or DHW pump depending
on the previously operated function) keeps running for a period
equal to the post-circulation function.
Any subsequent CH, DHW, or anti-frost request has priority over
post-circulation and therefore halts it.
Post-circulation when exchanger heat holding function is not active:
Post-circulation when exchanger heat holding function is active:
1.2.2.2. Management of a heating unit serving a mixed water
CH zone + DHW supply (BV and RV models)
(*) In R and RV models, DHW supply and related functions are
operated only when an external cylinder is connected (optional
equipment).
The indication of operation, malfunction diagnostic, DHW (*),
EXCHANGER HEAT HOLDING, ANTI-FROST, PUMP ANTI-
BLOCKING, ANTI-LEGIONELLA, and OVER HEAT MANAGEMENT
modes are the same as in B and R models ( see 1.2.2.1 paragraph
above); operation of CH functions is different.
Below are described the variations from units without mixed water
zone management (B and R models); refer to 1.2.2.1 paragraph for
other functions.
Set button 16 to position I: power is supplied to the heating unit
and the button light is ON.
Knob 11 is to select the heating unit operation mode. In detail:
“timer” position ( to be used when programmable timer 15 is
installed).
All functions are active: (CH, DHW (*), ANTI-FROST, PUMP ANTI-
LOCKING, ANTI-LEGIONELLA).
In this position the heating unit operates following the programs
of the two channel programmable timer 15. The user manages CH
through channel 1 (see CENTRAL HEATING); The user manages
DHW (*) supply through channel 2 (see DOMESTIC HOT WATER);
- CHANNEL 1 with external probe
Channel 1 ON: flow temperature (high and low temperature) is
adjusted in order to achieve COMFORT room temperature set by
knob 13b.
Channel 1 OFF: flow temperature (high and low temperature) is
adjusted in order to achieve NIGHT room temperature.
(NIGHT room temperature = COMFORT room temperature – 4°C;
when CM4 jumper is positioned to OFF – see electric diagram;
NIGHT room temperature = COMFORT room temperature – 2°C;
when CM4 jumper is positioned to ON).
Room thermostats turn ON or OFF the relevant zone pumps and
when all room thermostats are OFF, CH requests are terminated.
- CHANNEL 2
As described in 1.2.2.1 paragraph.
The programmable timer 15 allows for setting of up to 8 ON daily
programs and 8 OFF daily programs.
Detailed programmable timer setting procedure is available in 1.2.3
paragraph.
“Comfort” position.
All functions are active: (CH, DHW (*), ANTI-FROST, PUMP ANTI-
LOCKING, ANTI-LEGIONELLA).
Channel 1 of the programmable timer is considered always ON re-
gardless of the set program, therefore CH function is managed by
the room thermostat or thermoregulation control unit (when they
are available), ignoring timer programmed settings.
Flow temperature is not managed by the user through knob 13b, it
manages the fictitious temperature to COMFORT (see
1.2.2.3 paragraph “SLIDING TEMPERATURE” operation).
Room thermostats turn ON or OFF the relevant zone pumps, and
when all thermostats are OFF, CH requests are terminated.
DHW (*) function is managed through knob 12b (B and BV models),
by the adjustable thermostat on the cylinder (R and RV models),
and by channel 2 of the programmable timer (see above informa-
tion about “programmable timer”).
“Night” position.
CH, DHW (*), ANTI-FROST, PUMP ANTI-LOCKING, ANTI-LEGIO-
NELLA functions are active.
Channel 1 of the programmable timer is considered always OFF
regardless of the set program.
Flow temperature is not managed by the user through knob 13b,
it manages the fictitious room temperature to NIGHT (see 1.2.2.3
paragraph).
-NIGHT room temperature = COMFORT room temperature – 4°C;
when CM4 jumper is positioned to OFF – see electric diagram;
NIGHT room temperature = COMFORT room temperature – 2°C;
when CM4 jumper is positioned to ON).
See 1.2.2.3 paragraph “SLIDING TEMPERATURE” operation.
Room thermostats turn ON or OFF the relevant zone pumps, and
when all thermostats are OFF, CH requests are terminated.
DHW(*) is set by knob 12b (B and BV models), or via the adjustable
thermostat on the cylinder (R and RV models), and by channel 2 of
the programmable timer (see above information about “program-
mable timer” ).
1.2.2.3. “SLIDING TEMPERATURE “ operation
When an external probe is connected
(standard equipment in BV and RV
models), the heating unit manages
the high temperature zone flow (e.g.
temperature of the radiators), and
the low temperature flow (e.g. floor
heating), in relation to:
- outdoor temperature (as observed
by the external probe)
- desired room temperature, which can be set via knob 13b (fictitious
room temperature). Temperature range goes from 12°C to 28°C:
When knob 13b is fully rotated counter-clockwise, the fictitious room
temperature is 12°C, when knob 13b is set to 9:00 it is 15°C, when
knob 13b is set to 12:00 it is 20°C, when knob 13b is set to 3:00 it is
25°C, and when knob 13b is fully rotated clockwise it is 28°C.
For best setting of the curves, it is advisable the position “20°”.
8 9
CH post-circulation, anti-frost (active pump: CH) 180 s
DHW post-circulation, anti-frost (active pump:
DHW) 30 s
CH post-circulation, anti-frost, DHW (active
pump: DHW) 180 s

8 9
pic. 2
0CIRCSTA06
R4 = setting of low
temperature curve
0CIRCSTA05
P4 = setting of high
temperature curve
P4
R4
100
90
80
70
60
50
40
30
20
10
0
3.0 2.5
2.0
1.5
1.0
4.2
3.4
2.6
1.8
HIGH TEMPERATURE
ADJUSTING CURVE (P4)
LOW TEMPERATURE ADJUSTING CURVE (R4)
20 16 12 8 4 0 -4 -8 -12 -16 -20 -24 -28 -32 -36 -40
OUTDOOR TEMPERATURE (°C)
FLOW TEMPERATURE (°C)
The curves displayed in the above chart are referred to a desired room temperature of 20°C.
Should desired room temperature be different from 20°C, higher or lower, all curves slide consequently, toward the top or the bottom of
the chart.
NOTE TO THE FITTER
The fictitious room temperature, set by the user through knob 13b,
is more precise when the SLIDING TEMPERATURE curves are set
correctly.
Such curves are to be set by the fitter by programming:
- the curve coefficient for high temperature, set through P4 poten-
tiometer on the thermal unit electronic board (code 0CIRCSTA05
in the electric diagram). It is advisable to set the potentiometer
between 1 and 1,5.
- the curve coefficient for low temperature, set through R4 poten-
tiometer on the zone electronic board (code 0CIRCSTA06 in the
electric diagram). It is advisable to set the potentiometer between 3
and 4.
In order to access to P4 and R4 potentiometers, it is necessary to
open the control panel (see pic.2).

10 11
1.2.3. Electronic timer programming
1 2
3
4
7
6
5
8
9
A) Initialization
When programming the timer for the first time, or re-programming it,
it is advisable to perform a full reset of the timer by positioning se-
lector 2 to RUN and pressing the reset micro-button R: The time and
start and stop programs will be reset (time display flashes 0:00).
In order to set the week day, actual time and start and stop pro-
grams, see paragraph B and C.
B) Setting the day of the week and actual time
Position selector 2 to RUN and at the same time press buttons h
and m until the two dots, dividing hours and minutes stop flashing
(If previously the reset micro-button R was pressed, the actual time
display stops flashing also); press button 1…7 in order to set the
current week day ( shown by indicator 8), press button h to set actual
hour, press button m to set actual minutes (by keeping button h or m
pressed the digits run faster).
Wait approximately ten seconds, until the two dots, dividing hours
and minutes start flashing. The programming procedure of the day of
the week and time is now completed.
C) Start and stop programs
Position selector 2 to P1 in order to program channel 1, and to P2 in
order to program channel 2 ( indicator 3 shows the chosen channel,
indicator 4 shows the symbol, indicating we are programming a start
time, and indicator 5 shows digit 1 to indicate the first program is set;
Up to 8 start periods and 8 stop periods can be set, a total of 16).
In order to set a start program, follow the instructions below:
- press button 1…7 in order to set the desired week day ( or days (1));
- press button h and button m to set hour and minutes of the start
program;
- press button to memorize the programmed time and go to the
stop program (indicator 4 is off showing we are programming a stop
time, and indicator 5 shows digit 2 indicating we are in the second
time of the program).
Perform again the above procedure in order to set the stop time, and
at the end press button .
Now we have set a heating unit operation period, by setting a start
and stop time, indicator 5 shows digit 3; Follow the above instruction
to program an additional heating unit operation period, otherwise po-
sition selector 2 to RUN to terminate the programming procedure.
(1) The following periods are available in order to automatically repeat
the programmed heating unit operation periods during the week:
Period no.1: single week day
Period no.2: day 1-2-3-4-5 of the week (Mon-Tue-Wed-Thu-Fri)
Period no.3: day 6-7 of the week (Sat-Sun)
Period no.4: day 1-2-3-4-5-6 of the week (Mon-Tue-Wed-Thu-Fri-
Sat)
Period no.5: day 1-2-3-4-5-6-7 of the week (Mon-Tue-Wed-Thu-Fri-
Sat-Sun)
When programming a start time by using a multiple day period (e.g.
period no.2), the stop time is to be programmed in the same multiple
day period for it to be effective every day of the period.
pic. 3
1 Mode selector
2 Program selector
3 Channel indicator
4 Channel activation indicator
5 Programmed period indicator
6 Skip function button
7 Skip function indicator
8 Week days indicator
9 Actual time

10 11
D) Timer operating modes
The programmable timer has 3 operating modes, they are available
through selector 1.
I permanently ON mode (the channel, or the channels
selected are always active)
AUTO operation follows the programs (the channels, 1 and 2, are
activated and de-activated following the programs (see C
paragraph for programming procedure)
0 permanently OFF mode (the channel, or the channels
selected are always inactive)
Permanently ON mode (I)
Proceed as follows in order to set one channel always active:
Position selector 1 to I, press button 6 once to activate channel 1,
twice to activate channel 2; the selected channel will flash for three
seconds (indicator 3), after that it will be displayed fixed and symbol
will be displayed (indicator 4), now the channel is permanently
active. Selector 1 is to remain set to I.
When both channels are to be set always active, repeat the above
procedure and select the channel which was not previously set. In-
dicator 3 will confirm permanent activation of both channels by di-
splaying digits 1 and 2.
When only one channel is set to be permanently active, the other
channel follows the set programs (see C paragraph for programming
procedure).
In order to stop permanent activation of the channels, position se-
lector 1 to AUTO.
Program operation mode (AUTO)
The channels activate and deactivate following the programs (see C
paragraph for programming procedure).
When a programmed start time is active, the symbol
(indicator 4)
and the active channel (indicator 5) are displayed.
Permanently OFF mode (0)
Proceed as follows in order to set one channel always inactive:
Position selector 1 to 0, press button 6 once to select channel 1,
twice for channel 2; the selected channel will flash (indicator 3), do
not press any other button for three seconds, now the selected chan-
nel will remain permanently inactive (indicator 3 will keep flashing the
selected channel). Selector 1 is to remain set to position 0.
Should it be needed to set both channels always inactive, repeat the
above procedure for the channel not previously involved. Indicator 3
will keep flashing digits 1 and 2, confirming both channels are inac-
tive.
When only one channel is set to be permanently inactive, the other
channel follows the set programs (see C paragraph for programming
procedure).
In order to stop permanent de-activation of the channels, position
selector 1 to AUTO.
It is possible to permanently activate one channel and permanently
de-activate the other.
Proceed as follows:
position selector 1 to I, press button 6 once to select channel 1, twice
for channel 2; the selected channel will flash for three seconds (indi-
cator 3), afterward it will be displayed fixed and symbol will ap-
pear (indicator 4), now the channel is permanently active
Quickly move selector 1 to 0, without stopping in AUTO, press but-
ton 6 once or twice to select the channel to be permanently de-acti-
vated; the chosen channel will flash (indicator 3), while the previously
activated channel will keep being displayed fixed and symbol � will
keep being shown (indicator 4), do not press any other button for
three seconds, now the channel will remain permanently inactive (in-
dicator 3 will keep flashing the selected channel).
E) SKIP function setting
The SKIP function (program by-pass) allows to change the operatio-
nal mode of the timer from ON to OFF and vice-versa, after pressing
button 6. Such function is displayed by the symbol .
In order to activate or de-activate the SKIP function, press button 6
again.
The SKIP function is active only when the programmable timer is set
to AUTO.
The operational status is shown on the display by the symbol
(indicator 4).
F) Technical characteristics
Electric connection: 220-
240Vca 50/60 Hz
Relay exit: 2 x 5A; 250Vca
single-pole contact
Lithium battery for program
memory in excess of 5 years
Minimum commutation time:
1 minute
Relays
CH1: ON/OFF switch (3-5)
CH2: ON/OFF switch (4-5)
1.2.4. “OPEN THERM” remote control programming (optional
equipment)
The heating units can be connected to an “Open Therm” remote con-
trol (option) supplied by the manufacturer.
In this instance the electronic timer (when available) has to have both
channels, 1 and 2, programmed as permanently ON (see 1.2.3 para-
graph);
The remote control allows for full management of the heating unit
(CH, DHW, CH and DHW flow temperatures, operation programs,
etc.) with the exception of the EXCHANGER TEMPERATURE MAIN-
TENANCE and CYLINDER ACTIVATION/DE-ACTIVATION, are to be
managed via the relevant adjusters/selectors: 12b (pic.1) for CYLIN-
DER function and 13b for EXCHANGER TEMPERATURE MAINTE-
NANCE function.
WARNING
When a Remote Control is connected, selector 11 is to be set to
COMFORT and the programmable timer (when available) has
to have both channels, 1 and 2, programmed as permanently ON
(see 1.2.3 paragraph);
See 3.2.11 paragraph for “Open Therm” remote control installation
procedure.
See the “Open Therm” remote control own manual for programming
procedure
M
1 2 3 4
CH1 CH2
5

1.2.5. Heating unit shutdown
When there is a malfunction, the heating unit automatically shuts
down. In order to detect the cause of the shutdown, see 4.10 pa-
ragraph “Burner troubleshooting” and 7 paragraph “Heating unit
troubleshooting”.
1.2.5.1. Burner shutdown
When there is a burner malfunction, it automatically shuts down and
shutdown light 1 turns on, on the control panel (pic.1), and the red
reset button on the burner (pic.2).
In this instance, proceed as below described:
- check fuel to be available, its valve to be open and that fuel is
actually supplied from the network;
- Once fuel availability is verified, reset the burner by pressing the
red lit reset button (pic. 4): should the appliance not start and resu-
me shutdown, after three attempts, contact an Authorized Service
Center or qualified technician for service.
WARNING
Should the burner shut down frequently, indicating a recurrent
malfunction, contact an Authorized Service Center or qualified
technician for service.
1.2.5.2. Shutdown due to overheating
Should the red overheating light 2 (pic.1) come on, it means the
safety thermostat with manual reset has cut in due to a malfunction.
Please contact an authorized Service Centre or a qualified service
technician for service.
1.2.5.3. Shutdown due to low water pressure
Should the pressure switch shut down the boiler, no.4 red light star-
ts flashing (pic.1), indicating low water pressure in the CH system.
Restore pressure by acting upon the loading tap (pic.5), located in-
side the heating unit.
In order to restore proper water pressure proceed as follows:
- turn the main switch 16 (pic.1) to O (the green light turns off);
- remove the heating unit front panel (R model), or the heating unit
lower front panel (B model), by pulling it toward the outside,
- Rotate the loading tap (pic.5) counter-clockwise in order to allow
water into the heating unit, and keep it open until the water pressu-
re gauge (14 in pic.1) indicates 1/1,3 bar; now shut the tap by fully
rotating it clockwise, and install the front panel.
WARNING
Open the loading tap only.
Do not touch any other component of the heating unit as they
could be hot, such as the heat exchanger and water pipes.
Once the loading procedure is completed, carefully close the
tap. Should the tap not be fully closed, the water pressure may
raise, the safety valve intervene and let water out of the heating
unit.
Should the shutdown occur frequently, contact an authorized
Service Centre or a qualified service technician for service.
1.2.5.4. Shutdown due to malfunction of the temperature pro-
bes
When the burner shuts down due to a malfunction of the tempera-
ture probes, the following lights start flashing:
- red light no.5 (pic.1) for probe 1 (CH); the burner turns off and the
pump starts running;
- red light no.7 (B and BV models) for probe 2 (DHW); DHW supply
is terminated, CH function is still available.
In the above instance, contact an authorized Service Centre or a
qualified service technician for service.
12 13
Reset button
Model B and BV
Model R and RV
pic. 4
pic. 5
Loading tap
Model B and BV Model R and RV

12 13
1.3. Maintenance
The heating unit is to be serviced in accordance to current laws and
regulations.
Proper maintenance allows the heating unit to operate efficiently,
environmentally friendly, and safely with regards to people, animals
and property.
The heating unit maintenance procedure is to be performed by qua-
lified personnel.
The user may only clean the outer casing of the heating unit, by
means of furniture cleaning products.
Do not use water!
1.4. Information for the user
The user can only access heating unit parts which are accessible
without the use of tools and/or utensils.
No-one, including qualified personnel, is authorized to implement
modifications to the heating unit.
The manufacturer shall not be held liable for injury to people and
animals, and damage to property resulting from tampering with or
improper intervention to the heating unit.
Should the heating unit be left inactive for a long period, and power
disconnected, it may be necessary to unlock the pumps.
This operation must be performed by a qualified service techni-
cian.
It order to prevent the pumps from locking, add special filming pro-
ducts to the water, suitable for multi-metal systems.
Frost protection can be ensured by adding a specific anti-freeze
product suitable for multi-metal systems.
Do not use automotive anti-freeze and check it regularly to verify
product efficacy.
The heating unit is equipped with a led thermometer on the control
panel (pic.1), for water temperature verification.
2. TECHNICAL FEATURES AND DIMENSIONS
2.1. Technical features
The heating unit has a cast iron heat exchanger with three flue gas
passes, and operates with an oil-fired blown-air burner; the following
models are available:
B combination heating unit, serving one high temperature CH zone,
and equipped with a 130 liter DHW cylinder;
BV combination heating unit, serving one high temperature CH zone
and one low temperature CH zone (via mixing valve), equipped with
a 130 liter DHW cylinder;
R CH only heating unit, serving one high temperature CH zone;
RV CH only heating unit, serving one high temperature CH zone and
one low temperature CH zone (via mixing valve);
All the above models are available in the following versions:
TF 23: open chamber heating unit with 24 kW thermal output;
TF 33: open chamber heating unit with 33 kW thermal output;
TF 43: open chamber heating unit with 43 kW thermal output;
TFD 23: sealed chamber heating unit with split air/flue gas system
and 24 kW thermal output;
TFD 33: sealed chamber heating unit with split air/flue gas system
and 33 kW thermal output;
TFD 43: sealed chamber heating unit with split air/flue gas system
and 43 kW thermal output.
Each heating unit meets the legal requirements in the country of de-
stination which is indicated on the rating plate.
Installation in a different country from the one indicated may be sour-
ce of injury and/or damage for people, animals and properties.
The heating unit main technical features are listed below.
Manufacturing features
- High-efficiency cast-iron heat exchanger with three flue gas
passes.
- Extra thick fiberglass insulation with aluminum Kraft (50 mm).
- Oil-fired blown air burner, sealed version, with built-in fuel oil pre-
heater.
- 130 liter DHW ceramic-glass lined cylinder, easy to inspect, with
high efficiency, oval shaped, coil exchanger, polyurethane
insulated, and magnesium sacrificial anode;
- Electro-zinc plated steel sheet casing, painted with
epoxy-polyester powder.
- Electronic control board managing the heating unit.
- 12 liter CH expansion vessel.
- 5 liter DHW expansion vessel (B and BV models).
- 3 bar CH safety valve.
- 7 bar DHW safety valve (B and BV models).
- Three-speed CH pump with integrated air purging device.
- DHW pump with integrated air purging device(B and BV
models).
- Additional air purging device on the exchanger.
- Digital programmable timer (optional equipment for B and R
models).
- In-line oil filter.
- Cylinder temperature probes.
- CH system loading tap.
- CH system unloading tap.
- Low water pressure switch.
- Safety thermostat (110°C).
- Designed to host an additional electronic board for different CH
zone management (standard on BV and RV models).
- Designed for connection to an Open Therm remote control
(optional kit).
- Designed for connection to an external temperature probe
(optional kit for B and R models, standard on BV and RV models).
User interface
- Master switch with light;
- selector managing: TIMER, COMFORT TEMPERATURE, NIGHT
TEMPERATURE, ANTI-FROST, SUMMER;
- CH water temperature adjusting knob (also allowing activation of
EXCHANGER TEMPERATURE MAINTENANCE function);
- DHW temperature adjusting knob in B and BV models (also
allowing activation/de-activation of cylinder);
- cylinder activation selector (R and RV models);
- thermometer with leds;
- pressure gauge;
- lights indicating:
. power ON;
. burner ON;
. CH function active;
. burner shutdown;
. overheating shutdown;
. low water pressure shutdown;
. shutdown due to malfunction of temperature probes;
. remote control connection fault;
Operational functions
- Anti-frost function;
- anti-legionella function;
- pump anti-locking function;
- pump post-circulation function;
- excessive heat management function.

14 15
pic. 7
2.2. Dimensions
1FLOW G1 M 6HIGH TEMP. RETURN (VA version) G1 M
2DOMESTIC COLD WATER INLET G1/2 M 7LOW TEMP. RETURN (VA version) G1 M
3RETURN G1 M 8ADDITIONAL FLOW G1 M
4HIGH TEMP. FLOW (VA version) G1 M 9RETURN OUTLET FOR 0KITSANI01 (VA version)
5LOW TEMP. FLOW (VA version) G1 M 10 FUEL INLET
Models R and RV
Models B and BV
D (mm)
TF 150
TFD 120
1FLOW G1 M 6HIGH TEMP. FLOW (BV version) G1 M
2RETURN G1 M 7HIGH TEMP. RETURN (BV version) G1 M
3DHW G3/4 M 8LOW TEMP. FLOW (BV version) G1 M
4RE-CIRCULATION G1/2 M 9LOW TEMP. RETURN (BV version) G1 M
5DOMESTIC COLD WATER G3/4 M 10 FUEL INLET
D (mm)
TF 150
TFD 120
Air intake
version TFD
version TFD
800
10
10
pic. 6
800
800
800

14 15
2.3. Heating unit layout
TS
EXTERNAL PROBE
PS
PR
CYLINDER
domestic cold
water
domestic hot
water
CYLINDER PROBE
ZONE 1
HIGH TEMPERATURE
TA 2 REMOTE CONTROL
or
TA 1
COLLECTOR
P1
P2
MTSM LOW TEMPERATURE FLOW PROBE
ZONE 2
LOW TEMPERATURE
VM
HEATING UNIT
S1
MODEL BV
PR: CH PUMP
PS: DHW PUMP
P1: HIGH TEMPERATURE PUMP
P2: LOW TEMPERATURE PUMP
TS: LIMIT TERMOSTAT
TSM: LOW TEMPERATURE LIMIT
TERMOSTAT
VM: MIXING VALVE
TA1: ZONE 1 ROOM THERMOSTAT
(OPTIONAL)
TA2: ZONE 1 ROOM THERMOSTAT
(OPTIONAL)
TA 1
TS
EXTERNAL PROBE
PS
PR
HEATING UNIT
CYLINDER
Domestic cold water
Domestic hot water
REMOTE CONTROL
or
CYLINDER PROBE
ZONA 1
HIGH TEMPERATURE
TS
S1
MODEL B
PR CH PUMP
PS DHW PUMP
TS LIMIT THERMOSTAT
TA1 ROOM THERMOSTAT (OPTIONAL)
TA 1
TS HEATING UNIT PROBE
EXTERNAL PROBE
PR
HEATING UNIT
REMOTE CONTROL
or
ZONE 1
HIGH TEMPERATURE
MODEL R
PR CH PUMP
TS LIMIT THERMOSTAT
TA1 ROOM THERMOSTAT (OPTIONAL)
TS HEATING UNIT PROBE
EXTERNAL PROBE
PR
HEATING UNIT
ZONE 1
HIGH TEMPERATURE
TA 2 COMANDO REMOTO
or
TA 1
COLLECTOR
P1
P2
MTSM LOW TEMPERATURE FLOW PROBE
ZONE 2
LOW TEMPERATURE
VM
MODEL RV
PR: CH PUMP
PS: DHW PUMP
P1: HIGH TEMPERATURE PUMP
P2: LOW TEMPERATURE PUMP
TS: LIMIT THERMOSTAT
TSM: LOW TEMPERATURE LIMIT
THERMOSTAT
VM: MIXING VALVE
TA1: ZONE 1 ROOM THERMOSTAT
(OPTIONAL)
TA2: ZONE 2 ROOM THERMOSTAT
(OPTIONAL)
pic. 7

16 17
2.4. Technical data of the heating units
2.5 Technical data of the burner
(*) B and BV models only
MODEL 23 33 43
Efficiency rating
Thermal input Qn kW 26.6 36.3 47.2
Thermal output Pn kW 24.0 33.0 43.0
Efficiency at nominal load % 90 91 91
Efficiency at reduced load % 89.7 90.7 90.7
No. of elements of cast iron heat exchanger 3 4 5
CO2 value % 12.5 ÷ 13.0
Flue gas temperature °C 215 190 188
Bacharach number <1 <1 <1
Flue gas flow rate kg/h 40.0 53.2 69.3
Flue gas load loss Pa 13 25 40
Water capacity l 20 24 28
Minimum flow rate of heating system l/h 680 950 1230
Load loss of water side (∆t =10 K) Pa 4800 5600 6000
Temperature holding loss (∆t =50 K) % 0.5 0.5 0.5
CH temperature range °C 50 ÷ 82 50 ÷ 82 50 ÷ 82
Max. CH operating pressure bar 3 3 3
CH expansion vessel capacity l 12 12 12
DHW expansion vessel capacity (*) l 5 5 5
DHW temperature range (*) °C 35 ÷ 57 35 ÷ 57 35 ÷ 57
Max. DHW working pressure (*) bar 7 7 7
DHW supply (∆t 30 K) l/10 min 215 250 265
Power supply V/Hz 230/50
Power supply fuse A 2 2 2
Height mm 1600 1600 1600
mm 875 875 875
Length mm 600 600 600
Depth mm 800 800 800
MODEL 23 33 43
Fuel Oil 1.4°E. Hi = 10210 kcal/kg 20°C
Nozzle manufacturer Delavan W. Steinen Q. Danfoss S
Type of nozzle Usgal/h 0.60 0.85 1.00
Nozzle inclination - 80°B 80°W 60°B
Oil pressure calibration bar 12.0 12.0 12.0
Oil consumption kg/h 2.24 ± 4% 3.06 ± 4% 3.98 ± 4%
Pump negative pressure bar >-0.4 >-0.4 >-0.4
Pre-heater W 55 55 -
Combustion head calibration index fixed fixed 4
Mod. B/BV
Mod. R/RV
2.5. Technical data of the burner

16 17
3.1. Installation regulations
The heating unit is to be installed in accordance to applicable stan-
dards and laws, which are to be considered as incorporated in full
to this manual.
3.2. Installation
3.2.1. Packaging
The heating unit is packed in a sturdy wooden cage on a wooden
pallet. Once the wooden cage has been removed, check the hea-
ting unit to be intact. The packaging material is recyclable: and it is
to be disposed of in a specific waste management center.
Keep the packaging out of the reach of children as by its nature may
be hazardous.
The manufacturer shall not be held liable for injury to persons and
animals or damage to property resulting from non-observance of
the above instruction.
The packaging contains:
- installation, use and maintenance handbook,
- four screw-adjustable legs,
- oil filter, hose pipes and fittings for burner fuel supply.
3.2.2. Choosing where to install the heating unit
When choosing the position of the heating unit please take into ac-
count the following:
- it is advisable to provide a 50 cm clearance from each side of the
heating unit, in order to simplify service operations;
- avoid installing the heating unit in humid or dusty areas;
- the boiler room is to be un-accessible to non authorized person-
nel, children and animals.
3.2.3. Installing the heating unit
Before connecting the boiler to the DHW and CH system pipes,
carefully clean the pipes to remove all traces of metal resulting from
processing and welding operations as well as any oil and grease
which could damage the heating unit or alter its operation.
WARNING
Do not use solvents which could damage the components.
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 instruction.
After placing the heating unit in the boiler room, and in order to in-
stall it, proceed as follows:
B and BV MODELS
- remove the two front panels by pulling them toward the outside;
- remove the two screws securing the base to the wooden pallet;
- in order to remove the wooden pallet from the heating unit, it is
necessary to raise it; proceed carefully: insert two 1” iron bars throu-
gh the openings underneath the chassis which supports the heat
exchanger, raise it without damaging the hydraulic components and
lower it to the floor;
- screw the four adjustable supporting legs in: adjust as necessary in
order to stabilize the unit;
- connect the heating unit to the DHW and CH flow and return pi-
pes;
- connect the unit to the chimney (and to the air intake pipe in TFD
versions);
- connect the heating unit to the power mains and, when available,
to the room thermostat (option).
- connect the burner to the fuel oil supply pipes (see paragraph
3.2.4);
R and RV MODELS
- remove the front panel by pulling it toward the outside;
- remove the two screws securing the base to the wooden pallet;
- in order to remove the wooden pallet from the heating unit, it is
necessary to raise it; proceed carefully: insert two ropes or cables
under the base front-rear wise, raise it and lower it to the floor;
- screw the four adjustable supporting legs in: adjust as necessary
in order to stabilize the unit;
- connect the heating unit to the CH flow and return pipes;
- connect the unit to the chimney (and to the air intake pipe in TFD
versions);
- connect the heating unit to the power mains and, when available,
to the room thermostat (option).
3.2.4. Connection to the fuel oil mains supply
Refer to paragraph 4.3 for instructions on connecting to the fuel oil
supply.
When heating units are installed in particularly cold areas, use fuel
oil with a low content of paraffin.
It may be necessary to install an additional fuel oil pre-heater.
It is mandatory to install the provided fuel oil filter.
3.2.5. Room ventilation
Heating units are designed for connection to a chimney.
The combustion air can be taken:
- directly from the room in which the unit is installed;
- from outdoor using 80 mm diameter pipes (D version).
N.B.
When the combustion air is taken from the room where it is
installed, the system must comply with applicable standards
and laws which are to be considered as fully incorporated to
this manual.
3.2.6. Air intake and flue gas discharge system
As far as the emission of flue gas into the atmosphere, it is manda-
tory to comply with all applicable standards and laws; they are to
be considered as fully incorporated in this manual.
The flue gas discharge pipes in the heating system have the fol-
lowing diameter:
- connection to 150 mm diameter flue gas discharge ducts (TF ver-
sions; type B23);
- connection to 120 mm diameter flue gas discharge ducts (TFD
versions; types B23, C53 and C83).
TF version (type B23)
Flue gas discharge ducts must be connected to a chimney system
designed in compliance with all applicable standards and laws, whi-
ch are to be considered as fully incorporated to this manual. When
the combustion air is taken from the room where the unit is installed,
the system must comply with applicable standards and laws.
The chimney system and flue gas pipes must comply with the fol-
lowing requirements:
- the diameter is not to be smaller than the heat-exchanger flue gas
discharge opening. In case of square or rectangular cross section
flue gas pipes, the diameter must be 10% larger than the opening
diameter of the heat exchanger.
- the pipes must be made with waterproof material, resistant to flue
gas temperature and acid condensate;
- they are to have low thermal conductivity, proper mechanical resi-
stance, perfect seal and appropriately calculated height and cross
section;
- vertical path (chimney system) and constant cross section without
any narrowing;
- the terminal is to ensure constant, efficient discharge of flue gas in
any atmospheric condition;
- the terminal must project at least 50 cm from any adjacent struc-
ture within a 5 meter radius.
3. INSTRUCTIONS FOR THE INSTALLER

18 19
TFD version (types B23, C53 and C83)
The heating unit, TFD version (types B23, C53 and C83) has a fe-
male fitting at its back, with an 80 mm lip seal for connection to a
combustion air intake pipe. The pipe is already connected to the
burner via a flexible paper-aluminum duct.
Combustion air can be taken from outside the room in which the
heating unit is installed by means of a suitable pipe.
Maximum length of the combustion air pipe is specified in the fol-
lowing technical data charts.
Flue gas discharge system is to be implemented by means of 120
mm diameter pipes, vertical and horizontal, and wall terminal when
laws and regulations allow it; maximum length of the flue gas pipe
is specified in the following technical data charts.
When bends are necessary in the combustion air system, bear in
mind that a wide radius 90° bend, in term of load losses, is equiva-
lent to a 1 meter long straight section of pipe, and a narrow radius
90° bend is equivalent to a 1.5 meter long straight pipe.
N.B.
Only enameled steel or stainless steel pipes with gaskets from
the manufacturer or available on the market, are to be used as
flue gas discharge system.
In presence of vertical flue gas discharge pipes, provide a spe-
cific section for condensate discharge.
All the installations (both TF and TFD versions), require a spe-
cific section linked to the flue gas discharge pipe, allowing for
measurement of flue gas temperature and CO2 concentration,
so that the burner can be correctly adjusted and the combu-
stion efficiency verified.
N.B.
When routing through flammable walls, provide the flue gas
discharge pipes with suitable thermal insulation (50 mm mini-
mum thickness).
N.B.
When flue gas is discharged through 120 mm diameter pipes,
it is mandatory to install on the air intake pipe the provided 80
mm diameter terminal.
Types and classification of air intake and flue gas discharge systems
Type B23
Discharge through the wall (when allowed by applicable installation
standards) or through the roof or via chimney system dedicated to
the boiler only.
Type C53
The air intake terminal and flue gas discharge terminal are never to be
positioned on opposite walls.
Model 23
Max equivalent length of discharge pipe Ø 120 mm: 7 meters
Each added wide radius 90° equals 1 meter discharge
Each added narrow radius 90° equals 1.5 meter discharge
Model 33
Max equivalent length of discharge pipe Ø 120 mm: 9 meters
Each added wide radius 90° equals 1 meter discharge
Each added narrow radius 90° equals 1.5 meter discharge
Model 43
Max equivalent length of discharge pipe Ø 120 mm: 5 meters
Each added wide radius 90° equals 1 meter discharge
Each added narrow radius 90° equals 1.5 meter discharge
Model TFD 23
Air intake equivalent length
of Ø 80 mm pipe
Flue gas discharge equivalent length
of Ø 120 mm pipe
From 0 to 4 meters Up to 7 meters
From 4 to 6 meters Up to 9 meters
From 6 to 8 meters Up to 11 meters
Each added wide radius 90° equals 1 meter both in air intake and flue gas discharge
Each added narrow radius 90° equals 1.5 meter both in air intake and flue gas discharge
Model TFD 33
Air intake equivalent length
of Ø 80 mm pipe
Flue gas discharge equivalent length
of Ø 120 mm pipe
From 0 to 6 meters Up to 9 meters
From 6 to 7 meters Up to 11 meters
Each added wide radius 90° equals 1 meter both in air intake and flue gas discharge
Each added narrow radius 90° equals 1.5 meter both in air intake and flue gas discharge
Model TFD 43
Air intake equivalent length
of Ø 80 mm pipe
Flue gas discharge equivalent length
of Ø 120 mm pipe
From 0 to 5 meters Up to 5 meters
From 5 to 6 meters Up to 8 meters
From 6 to 7 meters Up to 10 meters
Each added wide radius 90° equals 1 meter both in air intake and flue gas discharge
Each added narrow radius 90° equals 1.5 meter both in air intake and flue gas discharge

18 19
Type C83
Type C device, equipped with fan after the combustion chamber,
and designed for connection, via its own duct, to single chimney
or chimney system serving more than one appliance (collective sy-
stem).
The single or collective chimney system is designed to operate via
natural draught.
The device is connected, via an additional duct, to an air intake
terminal retrieving air from outside the boiler room.
For suitable pipe lengths refer to type C53 charts.
3.2.7. Measuring combustion efficiency
Perform the following measurements in order to determine combu-
stion efficiency:
- combustion air temperature;
- temperature of flue gas and the CO2 concentration from provided
opening on the flue gas duct.
Perform the measurements after the boiler has reached
working temperature, and after verifying the Bacharach index
to be less than 1.
3.2.8. Connecting to the power mains
The heating unit must be connected to a 230V – 50 Hz power
supply.
The power cable must be made of rubber.
Do not use PVC cables, which have low temperature resistan-
ce and tend to deteriorate over time.
Make sure polarity instructions are followed and phase and
neutral are correctly wired.
Installation procedure is to comply with applicable standards
and laws, which are to be considered as fully incorporated to this
manual.
A two-pole switch must be fitted before the heating unit to ensure
safe maintenance procedures.
The power cabling must be protected by a differential magneto-
thermal switch with a suitable breaking capacity.
The mains supply must be properly earthed.
Carefully verify the above safety precaution. When in doubt, have
the electric system carefully checked by a qualified technician.
The manufacturer shall not be held liable for damage or injury
caused by failure to properly earth the system. The DHW, CH
and fuel pipes are not suitable for grounding purposes.
3.2.9. Hydraulic connections
CENTRAL HEATING
Before installing the heating unit we recommend you clean the sy-
stem to remove any impurities from the various components which
might damage the circulating pumps or the heat exchanger.
Central heating flow and return pipes must be connected to their
relevant G 1 fittings.
When determining the size of central heating circuit pipes, it is
necessary to take into account the load losses induced by the
radiators, thermostatic valves, radiator cut-off valves and configu-
ration of the system.
DOMESTIC HOT WATER (B and BV models)
Flow and return pipes must be connected to the relevant G ¾”
fittings on the heating unit.
Water mains pressure must not exceed 7 bar ( in presence of
higher pressures a reducer is to be installed).
The pressure in the DHW circuit is to limited to 3 - 4 bars.
The hardness of water from mains determines how often the coil
heat exchanger needs to be cleaned.
WARNING
- Should water be particularly hard it may be necessary to
install a domestic water softener, administering a specific pro-
duct for treating drinking water in compliance with applicable
laws.
It is always advisable to treat water harder than 20°F.
- Due to its pH value, water supplied from normal water sof-
teners may not be compatible with some components of the
heating system.
- The safety valve should be connected to the sewer, othe-
rwise the boiler room may get flooded.
The manufacturer shall not be held liable for damages caused
by failure to follow the above safety precautions.
3.2.10. Room thermostat connection
The heating unit can be connected to a room thermostat (option).
The wires of the room thermostat
are to be fixed to the relevant connection on the heating unit
electronic board (see electric layout charts).
The room thermostat contact is to be potential free.
The room thermostat wires are not to be routed together with the
power main cables.

20 21
3.2.11. “OPEN THERM” remote control installation (option)
The heating unit can be connected to an Open Therm remote
control (delivered as optional equipment). Position the remote
control on an inside wall of the premises, far from heat sources or
draughts. Detach the rear part of the plastic casing (grey) from the
front one (white), by means of a screwdriver, and fix the rear part to
the wall using the holes A (pic.8).
pic. 8
WARNING
The remote control is not to be connected to the 230V power
main.
The remote control wires are not to be routed together with the
power main cables.
In order to connect the remote control, employ two-wire cables
with the following characteristics:
- max length: 40 m;
- max. impedance: 2 x 4 Ω/m
- in order to avoid interferences it is possible to implement interla-
ced wires or with a sheath.
An electronic board, code 0SCHEREM00 is provided with the
remote control kit, and it to be used to connect the remote control
to the boiler.
Refer to the instruction delivered with the electronic board, code
0SCHEREM00, for its installation.
The connection of the remote control to the heating units to be
implemented by connecting position 1 and 2 of the remote control
to the OT-BUS 06 terminal board of the 0SCHEREM00 board (see
electric layout charts). The OT-BUS 06 terminal board is protected
against false polarity, that is the connections can be switched.
Now close the remote control.
WARNING
When connecting the remote control, selector 11 is to be set
to the COMFORT � position, and the programmable timer,
when available, has to have both channels, 1 and 2, program-
med as permanently ON (see 1.2.3 paragraph).
3.2.12. External probe installation
The heating unit can be connected to an external probe for ou-
tdoor temperature measurement (standard for BV and RV models,
as option for B and R models), and “sliding temperature” function
operation (see 1.2.2.3 paragraph)
Refer to the heating unit layout charts when choosing the type
of external probe.
The external probe wires are NOT to be routed together with
the power main cables.
Position the external probe on an outside wall facing North – North
/ East.
Do not install the probe in the windows areas, near ventilation
openings or heat sources.
In order to assure correct heating unit operation, employ only
manufacturer supplied probes.
3.3. Filling up the heating system
When all system connections are performed, the CH circuit can be
filled.
The procedure is to be carefully performed, following the steps
below indicated:
- open all radiator air purging valves and the automatic relief valves
on the heating unit;
- remove the front panel (for model R), or its lower part (for models
B), of the heating unit by pulling it toward the outside;
- turn the loading tap counter-clockwise in order to allow water
into the system;
- close the radiator air purging valves as soon as water comes out;
- check the gauge to show a pressure of 1-1,3 bars;
- close the loading tap and open all radiator air purging valves
again;
- switch on the heating unit and allow the system to reach working
temperature, then switch it off and repeat the air bleeding proce-
dure;
- allow the system to cool down and check the water pressure to
be 1-1,3 bars.
3.4. Starting up the heating unit
3.4.1. Preliminary checks
Prior to starting up the heating unit perform the following checks:
- the flue gas discharge pipe and the air intake pipe are installed
correctly: while the heating unit is working, no leakage of
combustion products from any of the seals is to be detected;
- the power supply voltage is 230 V - 50 Hz;
- the system is correctly filled with water (water pressure gauge
reading 1-1,3 bar);
- any cut-off valves in the CH and DHW systems are open;
- the fuel supply tap is open;
- the master switch is ON;
- the safety valve is not blocked;
- no water leaks are detected;
3.4.2. Switching on and off
For instructions on how to switch the heating unit on and off, refer
to the “Instructions for the user”.
3.4.3. Burner adjustment
After starting up the heating unit it is necessary to adjust the bur-
ner (see paragraph 4.4), checking that:
- fuel oil pressure;
- CO2 concentration;
- Bacharach index;
- flue gas temperature;
are in compliance with the values indicated in the technical data
chart (see4.4 paragraph).