Fondital ANTEA CONDENSING Quick start guide

IST 03 C 484 - 02
INSTALLATION,
USE & MAINTENANCE MANUAL
ANTEA
CONDENSING
EN

2
Dear Customer,
Thank You for choosing and buying one of our boilers. Please read these instructions carefully in order to properly install, operate,
and maintain the equipment.
The Manufacturer recommends that Customers contact qualied personnel only for maintenance and repair operations.

3
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 reference. The manual must accompany the boiler should it be sold or its possession transferred.
Following to the boiler installation, the installer is to advise the user on the boiler operation and its safety devices
This boiler must be used for the purposes for which it has been intended.
Any other use shall be considered incorrect and therefore dangerous.
The boiler must be installed by qualied personnel, in compliance 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, or non-observance of the manufacturer’s instructions shall release the
manufacturer from any and all contractual and extra-contractual liability.
Before installing the boiler, check that the technical data corresponds to the requirements for its correct use in the system design.
Check that the boiler is intact and it has not been damaged during transport and handling. Do not install equipment which is damaged and/or
faulty.
Do not obstruct the air suction openings.
Only manufacturer approved and supplied accessories or optional kits (including electric ones) are to be installed with this product.
Properly dispose of the packaging as all the materials can be recycled. The packaging must therefore be sent to specic waste management
sites.
Keep the packaging out of the reach of children as it may represent a source hazard.
In the event of failure and/or faulty functioning, switch o the boiler. Do not attempt to make repairs: contact qualied technicians.
Manufacturer approved and supplied parts must be used for all repairs to the boiler.
Non-observance of the above requirements may aect the safety of the boilers and endanger people, animals and property.
The manufacturer recommends Customers to contact qualied Service Centres for maintenance and repairs, they are best trained for that
procedure.
Routine boiler maintenance should be performed according to the schedule in the relevant section of this manual.
Appropriate boiler maintenance ensures ecient operation, preservation of the environment,
and safety for people, animals and/or property.
Incorrect and irregular maintenance can be a source of danger for people, animals and property.
In the event of long periods of inactivity of the boiler, disconnect it from power mains and close the gas Isolation valve.
Warning! Should power mains be disconnected, boiler electronic anti-freeze function will not be operative.
Should there be a risk of freezing, add antifreeze: it is not advisable to drain the system as this may result in damage; use specic anti-freeze
products suitable for multi-metal heating systems.
IMPORTANT
With gas red boilers, take the following measures if you smell gas:
- do not turn on or o electric switches and do not turn on electric appliances;
- do not ignite ames and do not smoke;
- close the main gas tap;
- open doors and windows;
- contact a Service Centre, a qualied installer or the gas supply company.
Never use a ame to locate a gas leak.
The boiler is designed for installation in the country indicated on the technical data plate: installation in any other country
may be a source of danger for people, animals and property.
Carefully read the warranty conditions and advantages oered by the manufacturer, as specied on the inspection certicate that comes with
the boiler.
General information for Installers, Maintenance Technicians and Users

4
QUICK GUIDE OPERATING INSTRUCTIONS
The following instructions will help you to switch the boiler on quickly and regulate it for immediate use.
It is presumed that the boiler has been installed by a qualied installer, it has been commissioned and is ready to operate
correctly.
If any accessories have been tted on the boiler, these instructions will not cover them.
You will therefore have to refer to the full boiler instructions as well as to the specic instructions for the accessories.
This manual contains full details of how the boiler works, and full operating and safety instructions.
1. Open the yellow handled gas cock installed Under the boiler.
2. Turn the Electrical mains switch installed adjacent to the boiler to ON: the display comes on and shows the function set via the boiler mode
button (g. 1) and ow water temperature.
3. If you do not wish to activate the heating function press the boiler mode button 3(g. 1) until displaying the SUMMER symbol: this will
activate domestic hot water (DHW) only, and the display will show the DHW temperature.
4. If you wish to activate the heating function and domestic hot water, press the boiler mode button (3, g. 1) until displaying the WINTER
symbol: this will activate both DHW and heating, the display will show the primary ow water temperature.
5. If you wish to activate the heating function press the boiler mode button 3(g. 1) until displaying the CENTRAL HEATING ONLY symbol: this
will activate heating function, and the display will show the primary ow water temperature.
6. To adjust the DHW temperature press domestic hot water temperature buttons (1in g. 1); then set as required. While regulating, the LCD
displays the temperature setting and the tap symbol ashes.
Boiler mode button SUMMER symbol
Boiler mode button WINTER symbol
Domestic hot water temperature buttons
Central heating water temperature buttons
8. Set the desired temperature on the (optional) room thermostat in the building.
The boiler is now ready to operate.
If the boiler shuts down, press boiler reset button (4in g. 1). If the boiler does not restart, contact a qualied Service Centre.
Boiler mode button CENTRAL HEATING ONLY symbol
7. To adjust the heating water temperature press heating water temperature buttons (6in g. 1); then set as required. While the heating water
temperature is being regulated, the LCD displays the temperature setting and the CH symbol ashes.

5
CONTENTS
Precautions ................................................................................................................................................................................................................................................. 2
General information for the installer, maintenance technician and users ................................................................................................................................ 3
Quick guide operating instructions.......................................................................................................................................................................................................... 4
1. Instructions for the user ...................................................................................................................................................7
1.1. Control panel........................................................................................................................................................................................................................................... 7
1.2. LCD ................................................................................................................................................................................................................................................. 8
1.3. Interpreting BOILER STATUS from LCD DISPLAY INDICATIONS ............................................................................................................................................. 9
1.4. Boiler operation....................................................................................................................................................................................................................................10
1.4.1. Switching on ..............................................................................................................................................................................................................................10
1.4.2. CH function .................................................................................................................................................................................................................................11
1.4.3. DHW function.............................................................................................................................................................................................................................11
1.4.4. Freeze protection function ....................................................................................................................................................................................................12
1.4.5. Pump and valve anti-shutdown function.........................................................................................................................................................................12
1.4.6. Operation with (optional) remote control .......................................................................................................................................................................12
1.5. Boiler shutdown ..................................................................................................................................................................................................................................12
1.5.1. Burner shutdown .....................................................................................................................................................................................................................13
1.5.2. Shutdown due to air/ue gas system malfunction.......................................................................................................................................................13
1.5.3. Shutdown due to a water circulation malfunction.......................................................................................................................................................13
1.5.4. Shutdown for fan malfunction.............................................................................................................................................................................................14
1.5.5. Alarm due to temperature probe malfunction ..............................................................................................................................................................14
1.5.6. Alarm due to (optional) remote control connection malfunction ..........................................................................................................................14
1.5.7. Alarm due to (optional) external probe malfunction...................................................................................................................................................14
1.6. Maintenance .........................................................................................................................................................................................................................................14
1.7. Notes for the user ...............................................................................................................................................................................................................................14
2. Technical features and dimensions ..............................................................................................................................................15
2.1. Technical features ...............................................................................................................................................................................................................................15
2.2. Dimensions ............................................................................................................................................................................................................................................16
2.3. Boiler layout...........................................................................................................................................................................................................................................19
2.4. Operating data .....................................................................................................................................................................................................................................20
3. Instructions for installation............................................................................................................................................23
3.1. Installation standards.........................................................................................................................................................................................................................23
3.2. Installation .............................................................................................................................................................................................................................................23
3.2.1. Packaging ....................................................................................................................................................................................................................................23
3.2.2. Choosing where to install the boiler .................................................................................................................................................................................23
3.2.3. Positioning the boiler ..............................................................................................................................................................................................................23
3.2.4. Installing the boiler...................................................................................................................................................................................................................25
3.2.5. Boiler room ventilation ..........................................................................................................................................................................................................25
3.2.6. Air intake and ue gas discharge system ........................................................................................................................................................................26
3.2.6.1. Conguration of air intake and ue gas discharge ducts................................................................................................................................27
3.2.6.2. Ø 100/60 mm or Ø 125/80 mm air/ue gas discharge via coaxial ducts ...................................................................................................27
3.2.6.3. Ø 80 mm air intake and ue gas discharge via split ducts ..............................................................................................................................29
3.2.6.4. Ø 60 mm air intake and ue gas discharge via split ducts ..............................................................................................................................29
3.2.7. Checking combustion eciency ................................................................................................................................................................................................30
3.2.7.1. Flue cleaning function..................................................................................................................................................................................................30
3.2.7.2. Measurement procedure.............................................................................................................................................................................................30
3.2.8. Connection to gas mains........................................................................................................................................................................................................31
3.2.9. Hydraulic connections.............................................................................................................................................................................................................31
3.2.10. Connection to the electrical mains ..................................................................................................................................................................................32
3.2.11. Connection to room thermostat (optional) ..................................................................................................................................................................32
3.2.12. Installation and operation with Open Therm remote control (optional) ...........................................................................................................32
3.2.13. Installation of the (optional) external probe and “weather compensation” operation.................................................................................33
3.2.14. Parameters that can be set from boiler and remote control...................................................................................................................................35
3.3. Filling the system.................................................................................................................................................................................................................................37
3.4. Starting up the boiler .........................................................................................................................................................................................................................37
3.4.1. Preliminary checks....................................................................................................................................................................................................................37
3.4.2. Switching on and switching o ...........................................................................................................................................................................................37
3.5. Available head ......................................................................................................................................................................................................................................38
3.6. Wiring diagram .....................................................................................................................................................................................................................................39
3.7. Conversion to other gas types and burner adjustment.........................................................................................................................................................42
3.7.1. Switching from NATURAL GAS to PROPANE...................................................................................................................................................................42
3.7.2. Switching from PROPANE to NATURAL GAS...................................................................................................................................................................42
3.7.3. Burner adjustment...........................................................................................................................................................................................................................42
4. Testing the boiler.............................................................................................................................................................45
4.1. Preliminary checks...............................................................................................................................................................................................................................45
4.2. Switching on and switching o......................................................................................................................................................................................................45
5. Maintenance ...................................................................................................................................................................46
5.1. Maintenance schedule.......................................................................................................................................................................................................................46
5.2. Combustion analysis...........................................................................................................................................................................................................................46
6. Table of fault codes .........................................................................................................................................................47

6
PICTURE INDEX
g. 1 - Control panel....................................................................................................................................................................................................................................... 7
g. 2 - LCD ................................................................................................................................................................................................................................................. 8
g. 3 - Filler cock - model KC .....................................................................................................................................................................................................................13
g. 4 - Filler cock - model KRB ..................................................................................................................................................................................................................13
g. 5 - Filler cock - model KR .....................................................................................................................................................................................................................14
g. 6 - Dimensions - model KC .................................................................................................................................................................................................................16
g. 7 - Dimensions - model KRB ..............................................................................................................................................................................................................17
g. 8 - Dimensions - model KR .................................................................................................................................................................................................................18
g. 9 - Boiler layout - model KC ...............................................................................................................................................................................................................19
g. 10 - Boiler layout - model KRB ..........................................................................................................................................................................................................19
g. 11 - Boiler layout - model KR .............................................................................................................................................................................................................20
g. 12 - Installation template ....................................................................................................................................................................................................................24
g. 13 - Installation examples ...................................................................................................................................................................................................................26
g. 14 - Air intake and ue gas discharge coaxial pipe system ...................................................................................................................................................28
g. 15 - Dimensions for connection to coaxial pipe system..........................................................................................................................................................28
g. 16 - Air intake and ue gas discharge split pipe system .........................................................................................................................................................30
g. 17 - Dimensions for connection to split pipe system................................................................................................................................................................30
g. 18 - Air intake and ue gas discharge tower................................................................................................................................................................................30
g. 19 - Openings for combustion eciency measurement .........................................................................................................................................................30
g. 20 - Gas mains connection .................................................................................................................................................................................................................31
g. 21 - Central heating curves with external probe operation ...................................................................................................................................................34
g. 22 - Available head, model KC/KRB/KR 12.....................................................................................................................................................................................38
g. 23 - Available head, model KC/KRB/KR 24.....................................................................................................................................................................................38
g. 24 - Available head, model KC/KRB/KR 28.....................................................................................................................................................................................38
g. 25 - Wiring diagram...............................................................................................................................................................................................................................39
g. 26 - Boiler front door opening - 1.....................................................................................................................................................................................................43
g. 27 - Boiler front door opening - 1.....................................................................................................................................................................................................43
g. 28 - Gas valve adjustment...................................................................................................................................................................................................................43
g. 29 - Nozzle replacement......................................................................................................................................................................................................................43
g. 30 - Conversion to other gas types..................................................................................................................................................................................................44
TABLE INDEX
Table 1 - BOILER STATUS - LCD DISPLAY INDICATIONS during normal operation.................................................................................................................... 9
Table 2 - BOILER STATUS - LCD DISPLAY INDICATIONS in the event of malfunction............................................................................................................... 9
Table 3 - KC 12 model adjustment rates................................................................................................................................................................................................20
Table 4 - KC 24 model adjustment rates................................................................................................................................................................................................20
Table 5 - KC 28 model adjustment rates................................................................................................................................................................................................21
Table 6 - KR/KRB 12 model adjustment rates ......................................................................................................................................................................................21
Table 7 - KR/KRB 24 model adjustment rates ......................................................................................................................................................................................21
Table 8 - KR/KRB 28 model adjustment rates ......................................................................................................................................................................................21
Table 9 - General specications................................................................................................................................................................................................................21
Table 10 - Combustion specications, model KC/KR/KRB 12 ........................................................................................................................................................22
Table 11 - Combustion specications, model KC/KR/KRB 24 ........................................................................................................................................................22
Table 12 - Combustion specications, model KC/KR/KRB 28 ........................................................................................................................................................22
Table 13 - Limits to be set for TSP parameters and default values in relation to boiler type (TSP0) ...............................................................................33
Table 14 - Congurable limits for TSP parameters and default values.......................................................................................................................................35
Table 15 - Relationship between Temperature and Nominal resistance for temperature probes...................................................................................40
Table 16 - Fan speed.....................................................................................................................................................................................................................................42
Table 17 – CO2rates ......................................................................................................................................................................................................................................42

7
g. 1
1
23
5
46
7
1. INSTRUCTIONS FOR THE USER
1.1. Control panel
1. Set domestic hot water temperature
These buttons are used to set the domestic hot water temperature within a range from 35°C to 57°C.
2. Recall information and conrm parameters
This button is used to scroll the sequence of the values of some parameters, such as: primary ow water temperature, DHW temperature and
display of the last 5 shutdowns. This button is also used to conrm parameter settings.
3. Select boiler mode
Press this button to set the following functions.
SUMMER
Boiler only produces domestic hot water.
WINTER
Boiler provides central heating water and produces domestic hot water.
CENTRAL HEATING ONLY
The boiler provides central heating water only.
STANDBY
Boiler in standby mode: central heating function and DHW production disabled.
4. Boiler Reset function
This button resets the boiler operation after the burner shutdown device (lockout) has been activated.
5. LCD
The LCD displays the boiler status and operating data (see g. 2).
6. Set central heating water temperature
These buttons are used to set the heating water temperature within a range from 20°C to 78°C.
7. Water pressure gauge
This shows the pressure of the water in the primary heating system.

8
g. 2
a
bd
f
g
hl i
c e
m
1.2. LCD
a. Flue cleaning function indicator (function reserved for installation/service technician)
This indicator ashes when the ue cleaning function is active (press the “info”and “reset” buttons simultaneously). The boiler ow water
temperature and the fan speed (rpm) are shown (in this case, symbol fis also shown)
b. DHW indicator
This comes on when the boiler is in DHW mode.
Flashes when adjusting the DHW temperature with the buttons 1(g. 1).
c. Parameter editing indicator
This comes on when the value of the parameter can be modied (in this case, the indicator lights together with the symbol m). When edited
parameter value is conrmed this symbol will ash.
d. Alphanumeric indicator
This shows the following:
- CH ow water temperature
- CH temperature setting
- DHW temperature setting
- boiler status
- boiler diagnostics
e. Central heating indicator
This comes on when the boiler is in CH mode.
It ashes when adjusting the central heating water temperature with the buttons 6(g. 1).
f. Fan speed in rpm (function reserved for installation/service technician)
When the ue cleaning function is activated, symbol aturns on and ow water temperature and
fan rpm are shown (in this case, this symbol is also shown).
g. Calculated room temperature indicator
When an external probe is installed, this indicator ashes when the calculated room temperature is set via buttons 6.
h. Boiler status indicator
The two icons indicate the currently active operating modes:
SUMMER: only icon lits.
WINTER: both icons lit.
CENTRAL HEATING ONLY: only icon lits.
STANDBY: symbol displayed in alphanumeric indicator d
i. Flame indicator
This comes on when the burner ame is present.
l. Parameter indicator
Figures to view and edit parameters and indicate the burner current power rate (percentage).
m. Parameter indicator
It turns on when entering the parameter programming mode.

9
1.3. Interpreting BOILER STATUS from LCD DISPLAY INDICATIONS
Normal operation
Boiler in STANDBY mode
Boiler in SUMMER mode
No function active
The ow water temperature is displayed
Boiler in WINTER mode
No function active
The ow water temperature is displayed
Boiler in CENTRAL HEATING ONLY mode
No function active
The ow water temperature is displayed
Boiler in SUMMER mode
DHW temperature outlet
DHW temperature displayed
Boiler in WINTER mode
DHW temperature outlet
DHW temperature displayed
Boiler in WINTER mode
CH function active
The ow water temperature is displayed
Boiler in CENTRAL HEATING ONLY mode
CH function active
The ow water temperature is displayed
Table 1 - BOILER STATUS - LCD DISPLAY INDICATIONS during normal operation
Malfunction
Boiler not powered on
Boiler lockout due to ame absence
Triggering of double ow probe
Boiler lockout due to ue gas thermostat activation
Boiler lockout due to water pressure switch triggering
CH probe failure
DHW probe failure (KC model only)
Flue gas probe failure
External cylinder probe failure (KR or KRB models only)

10
Return probe fault
Remote Control connection failure (only shows on Remote Control panel)
Triggering of safety thermostat in mixed zone 2
Flow probe failure in mixed zone (the relevant zone is indicated below)
Fan failure
Communication failure between additional devices
Hydraulic conguration not allowed
Safety system hardware malfunction
Shutdown due to CH low water level
Shutdown due to ow temperature rising too quickly
Shutdown due to return temperature rising too quickly
Max. number of resume attempts from remote exceeded (option, with installed Remote
Control)
Table 2 - BOILER STATUS - LCD DISPLAY INDICATIONS in the event of malfunction
1.4. Boiler operation
1.4.1. Switching on
It is presumed that the boiler has been installed by a qualied installer, a tightness test has been carried out and the boiler
has been commissioned and is ready to operate correctly.
- Open the gas stop cock situated under the boiler;
- turn the mains fused spur switch installed adjacent to the boiler ON. The LCD activates and indicates the function currently active (see tables 1
and 2);
- select boiler operation mode via button 3 (g. 1): OFF/SUMMER/WINTER/CENTRAL HEATING ONLY;
- set desired CH temperature (see par. 1.4.2.);
- set desired DHW temperature (see par. 1.4.3.);
- set desired room temperature by means of the room thermostat if tted.

11
WARNING
Should the boiler be left inactive for a long time, particularly when boiler is propane-red, ignition might be dicult. Before starting
the boiler switch on another gas powered device (e.g. kitchen range).
Beware that even by following this procedure, the boiler might still experience some starting diculties and shut down once or twice.
Reset boiler operation by pressing button 4 (g. 1).
1.4.2. CH function
Set desired heating water temperature via buttons 6(g. 1);
CH water temperature adjusting range depends on operation range set through parameter P10:
- standard range: 20°C to 78°C;
- reduced range: 20°C to 45°C.
Operation range selection is to be implemented by a installer or a qualied Service Centre.
During temperature setting, the CH symbol on the LCD ashes and the CH setting is displayed.
When the central heating system requests heat from the boiler, the LCD displays the CH symbol (xed) and the current CH ow water
temperature.
The burner symbol only shows while the burner is operating.
To prevent frequent ignition and switching o in the heating mode, the boiler has an anti cycling timer of 4 minutes between ignitions.
Should water temperature in the system fall below set minimum value, the waiting time is reset and the boiler re-ignites.
1.4.3. DHW function
Set desired DHW temperature via buttons 1(g. 1);
Such function has always priority over CH water supply.
For model KC, DHW temperature may be set within a range from 35°C to 57°C. During temperature setting, the DHW symbol on the LCD ashes
and the DHW temperature setting is displayed.
For KRB and KR models with external water cylinder (optional) with NTC probe (10 kΩ @ ß=3435; refer to water cylinder technical specications),
temperature range is between 35 °C and 65 °C. When setting temperature, the DHW symbol will ash on the display and the DHW value being
set will be shown.
In KRB and KR models featuring an external water cylinder (optional) tted with a thermostat, the desired temperature must be set directly via
the water cylinder (refer to water cylinder technical specications).
When a water cylinder heating request is active, the DHW symbol (steady on) and the water ow temperature are shown on the LCD display
The burner on symbol shows while the burner is operating.
WARNING
On model KC a ow limiter is installed within the boiler, which limits domestic hot water output ow rate. This limit is: 8 litres per
minute (for model KC 12), 13 litres per minute (for model KC 24) and 14 litres per minute (for model KC 28).
Domestic hot water temperature supplied depends on the DHW temperature setting and on the quantity requested by the user. The
temperature of the water mains supply temperature is also a determining factor
Available DHW litres per minute depend on boiler thermal output and water mains supply temperature, according to the following formula:
K
l = DHW litre per min. = --------
ΔT
where
K represents:
- 258 in KC 12 model
- 393 in KC 24 model
- 419 in KC 28 model
Δt = DHW temperature – water mains supply temperature
For instance, with model KC 24, if the water supplied is at 8°C and you want shower water at 38°C, the value of ΔT is:
ΔT = 38°C - 8°C = 30°C
and the number of DHW litres per minute available at 38°C is:
393
I = --------- = 13.1 [litres per minute - water mixed at tap]
30

12
1.4.4. Freeze protection function
This boiler is tted with an anti-freeze protection system, which works when the following functions are activated: SUMMER, WINTER and
CENTRAL HEATING ONLY.
The anti-freeze function only protects the boiler, not the whole heating system.
A room thermostat must be used to provide freeze protection for the central heating system. Please be aware that the
thermostat is disabled when the boiler is in OFF mode.
Therefore, if you want to protect both the boiler and the system, use button 3 in g. 1 to select the WINTER mode .
When the heating water temperature probe detects a water temperature of 5°C, the boiler switches on and stays on at its minimum heat output
until the temperature reaches 30°C or 15 minutes have elapsed.
The pump continues to operate even if the boiler shuts down.
The anti-freeze function also protects the DHW circuit.
When the DHW temperature probe detects a temperature of 5°C, the boiler switches on and stays on at its minimum thermal power until the
temperature reaches 10°C or 15 minutes have elapsed (the diverter valve is in the DHW position).
The pump continues to operate even if the boiler shuts down.
For KRB and KR models with external water cylinder (optional) with NTC probe (10 kΩ @ ß=3435; refer to water cylinder technical specications),
the anti-freeze function also protects the water cylinder.
When the water cylinder temperature probe detects a temperature of 5°C, the boiler switches on and stays on at its minimum thermal power
until the temperature reaches 10°C or 15 minutes have elapsed.
The pump continues to operate even if the boiler shuts down.
For KRB and KR models with external water cylinder (optional) tted with a thermostat, the anti-freeze function does not protect the water
cylinder.
In this case the water cylinder can only be protected when the boiler is on SUMMER or WINTER mode and a temperature higher than 0 °C is set
on the water cylinder thermostat.
The central heating system can be eectively protected against icing by using specic anti-freeze products that are suitable for multi-metal
systems.
Do not use anti-freeze products for car engines, and check the eectiveness of the product used over time.
1.4.5. Pump and valve anti-shutdown function
If the boiler remains inactive and:
- the boiler operating mode is NOT OFF,
- the boiler is still connected to the mains supply,
the pump and the switching valve activate briey every 24 hours to keep them ecient.
1.4.6. Operation with (optional) remote control
The boiler can be linked to an (optional) remote control (supplied by the Manufacturer), which can be used for setting numerous parameters:
- boiler status
- room temperature
- CH system water temperature
- DHW system water temperature
- CH system or external water heater (optional) activation times;
- boiler diagnostics display
- boiler reset
and others.
Once the remote control has been installed, the boiler LCD will display the following code:
For instructions on how to connect the remote control, refer to par. 3.2.12. and the remote thermostat instruction booklet.
Only original remote controls supplied by the manufacturer must be used.
If non-original remote controls are used, correct operation of the boiler, or of the remote control, cannot be guaranteed.
1.5. Boiler shutdown
The boiler locks out automatically if a malfunction occurs.
Refer to Tables 1 and 2 to identify the boiler operating mode.
To determine the possible causes of malfunction, see also paragraph 6. Troubleshooting section is at the end of this manual.
Below is a list of shutdowns and the procedure to follow for each.

13
1.5.1. Burner shutdown
Fault code E01 is displayed ashing on the LCD display in the event of burner shutdown due to no ame recognition.
If this happens, proceed as follows:
- check that the gas cock is open and that gas is available at the appliance to check the gas supply by turning on another gas appliance and
check the emergency control valve is on;
- once you have conrmed fuel is available, press the reset button (4) (g.1) to restore burner operation: if, after two starting attempts, the boiler
still fails to start and enters shutdown mode again, contact a Service Centre or qualied personnel for maintenance.
If the burner shuts down frequently, there is a recurring malfunction, so contact a service Centre or a qualied service engineer.
1.5.2. Shutdown due to air intake/ue gas discharge system malfunction
If the air/ue gas system malfunctions, the boiler shuts down. The code E03 (ue gas thermostat activation) is displayed ashing on the LCD.
Contact a service Centre or a qualied service engineer.
1.5.3. Shutdown due to a water circulation malfunction
If there is a malfunction in water circulation in the heating system, the boiler shuts down.
The codes E81 or E82 or E83 or E84 are displayed, according to the malfunction.
There can be 2 dierent situations:
a) the pressure gauge (7, g. 1) shows a pressure lower than 1 bar
Proceed as follows to restore the correct water pressure:
- turn the lling cock (g. 3 for mod. KC, g. 4 for mod. KRB, g. 5 for mod. KR) anticlockwise to allow water to enter the boiler.
- keep the tap open until the pressure gauge shows a value of 1-1.3 bar.
- turn the tap o on completion.
- press the reset button (4in g. 1) to restore boiler operation then set it to the desired operating position.
If the boiler still fails to operate, contact a service Centre or a qualied service engineer.
Make sure you close the cock carefully after lling.
If you do not, when the pressure increases, the safety valve may activate and discharge water.
b) the pressure gauge (7, g. 1) shows a pressure of 1-1.3 bar
In the latter case, contact a service Centre or a qualied service engineer.
Filler cock
Part no. 0KITISTI09
Filler cock
g. 3
g. 4
MODEL KRB
MODEL KC

14
4
MODEL KR
Part no. 0KITIDBA09
Filler cock
g. 5
1.5.4. Shutdown due to fan malfunction
The fan operation is constantly monitored and in case of malfunction the burner goes o; the code E40 ashes on the LCD.
This mode is maintained until the fan recovers normal working parameters.
If the boiler should not re-start and remain in this mode, contact a Service Centre or a qualied service
engineer.
1.5.5. Alarm due to temperature probe malfunction
The following fault codes are shown on the LCD display in the event of burner shutdown due to a temperature
probe fault:
- E05 for the CH probe. In this case the boiler does not work.
- E06 for the DHW probe. In this case, the boiler functions in CH mode only, and the DHW function is disabled.
- E12 for the water cylinder probe (only models KRB/KR). In this case, the boiler functions in CH mode only, and the DHW function is disabled.
- E15 for the return probe. In this case the boiler does not work.
In all these cases, contact a Service Centre or a qualied service engineer.
1.5.6. Alarm due to (optional) remote control connection malfunction
The boiler recognises whether or not there is a remote control (optional).
If the remote control is connected but the boiler does not receive instructions from it, the boiler attempts to
re-establish communication for 60 seconds, after which the fault code E31 is shown on the remote control
display.
The boiler will continue to operate according to the settings on the control panel (g. 1) and ignore the remote
control settings.
The remote control can indicate faults or shutdown conditions and can also restore boiler operation after
shutdown up to a maximum of 3 times in a 24 hour period. If the maximum number of attempts is exceeded,
fault code E99 is shown on the boiler display.
Contact a service Centre or a qualied service engineer.
1.5.7. Alarm due to (optional) external probe malfunction
If the (optional) external temperature probe malfunctions, the boiler is still operating, but the “
weather compensation ” operation is disabled;
heating water temperature is adjusted according to the value set through buttons 6 (g. 1) that, in this case, will no longer work as calculated
room temperature adjusters (see paragraph 1.4.6.).
Contact a service Centre or a qualied service engineer.
1.6. Maintenance
Routine boiler maintenance must be provided according to manufacturer’s instructions in the country of installation and following the
instructions given in the relevant section in this manual.
Correct maintenance ensures that the boiler operates eciently, is environmentally friendly, and is not a danger to people, animals or property.
Maintenance and repairs must be performed by qualied personnel.
For boiler breakdowns and advice on repair carried out by a qualied technician, refer to section 6 – Maintenance.
It Is recommended that the boiler case is only cleaned with non abrasive standard household cleaning products.
The user is strongly advised to have the boiler serviced and repaired by a fully qualied Service Centres
1.7. Notes for the user
The user may only access boiler parts that can be reached without using any technical equipment or tools. The user is not authorised to
remove the boiler casing or attempt to access any of the internal parts.
No one, including qualied service engineers, are authorized to modify the boiler.
The manufacturer cannot be held liable for damage to people, animals, or property due to tampering or improper work carried out ton
this boiler.
If the boiler remains inactive and the power supply is switched o for a long time, it may be necessary to reset the pump.
Pump servicing includes removing the boiler housing and accessing the internal parts of the boiler, so this must only be carried out by
a qualied service engineer.
Pump blockage can be avoided by adding propriety inhibitors additives suitable for multi-metal systems.

15
2. TECHNICAL FEATURES AND DIMENSIONS
2.1. Technical features
The boiler is equipped with a fully pre-mixed gas burner. The following model is available:
- KC: condensing boiler with sealed chamber and forced draught, supplying CH water and instant DHW production;
- KRB: condensing boiler with sealed chamber and forced draught, supplying CH water only; with 3-way deviating valve for connection to
external water cylinder (optional).
- KR: condensing boiler with sealed chamber and forced draught, supplying CH water only.
This version is available with two power ratings:
- KC - KRB - KR 12: with heat input of 12 kW
- KC - KRB - KR 24:
with heat input of 24.9 kW
- KC - KRB - KR 28:
with heat input of 27.9 kW
Both models are equipped with electronic ignition and ionisation ame sensing device.
The boilers meet local applicable Directives enforced in the country of destination, which are stated on their rating plate.
Installation in any other country may be a source of danger for people, animals and property.
The key technical features of the boilers are listed below:
Operating features
- CH electronic ame modulation with timer-controlled rising ramp (60
seconds)
- Electronic ame modulation in DHW mode
- DHW priority function
- CH ow anti-freeze function: ON 5°C; OFF 30°C or after 15 minutes of
operation if CH temperature > 5 °C
- DHW anti-freeze function: ON 5°C; OFF 10°C or after 15 minutes of
operation if DHW temperature > 5 °C
- Water cylinder anti-freeze function (only KRB/KR): ON 5°C OFF 10°C or
after 15 minutes if water cylinder temperature
> 5 °C
- Timer-controlled ue cleaning function (15 minutes)
- CH maximum heat output adjustment through parameter P7
- Ignition heat output adjustment through parameter P6
- Possibility to select the heating range through parameter P10:
standard or reduced
- Ignition ame propagation function
- CH thermostat timer adjustable through parameter P11: 4 minutes
- Heating pump post-circulation function in CH, ANTI-FREEZE and
FLUE CLEANING mode (30 seconds)
- DHW post-circulation function: 30 seconds
- Post-circulation function for heating temperature > 78°C (30 seconds)
- Post-ventilation function after working: 10 seconds
- Post-ventilation function for heating temperature > 95°C
- Pump and diverter valve anti-seize function: 30 seconds of operation
every 24 hours with boiler not in use
- Ready for connection to a room thermostat (optional)
- Ready for operation with an external probe (optional supplied by the
manufacturer)
- Ready for operation with an OpenTherm remote control (optional,
supplied by the manufacturer)
- Ready for operation with a module for dierent temperature zones
- Anti- water hammer function: can be set from 0 to 3 seconds
through parameter P15
Manufacturing characteristics
- IPX4D electrically protected control panel
- Integrated, modulating electronic safety board
- Electronic ignition and ionisation ame detection device
- Stainless steel, fully pre-mixed burner
- Mono-thermal, high eciency, composite and stainless steel heat
exchanger with air purging device
- Twin shutter modulating gas valve with constant air/gas ratio
- Modulating, electronically managed combustion fan
- Three-speed pump with air purging device
- Minimum pressure switch
- CH (all models) and DHW (KC model) temperature probe
- Safety limit thermostat
- Flue gas thermostats
- Integrated, automatic by-pass
- 9 litre expansion vessel
- System loading and draining taps
- Stainless steel plate DHW heat exchanger (KC model)
- Motorised diverter valve (KC and KRB models)
- DHW priority ow switch (KC model)
- 8 l/min DHW ow-restrictor (KC 12), 13 l/min (KC 24), 14 l/min (KC 28)
User interface
- Liquid crystal display showing the boiler operating status
- Mode button: OFF, WINTER, SUMMER and CENTRAL HEATING ONLY
- DHW water temperature regulator: 35-57°C (KC) - 35÷65°C (KRB/KR).
- CH water temperature regulator: 20-78°C (standard range) or 20-45
°C (reduced range)
- Heating water pressure gauge

16
g. 4
Dimensions for connection to base
hydraulic kit (option)
Dimensions for connection to “plus”
hydraulic kit (option)
2.2. Dimensions
700
250
M
CGF
R
81
91
11431
66 6260 67 82 63
152,5
126
52
245
400
S
SV
bottom view top view
G Gas inlet (1/2”)
M CH flow (3/4”)
C DHW outlet (1/2”)
F Cold water inlet (1/2”)
R CH return (3/4”)
S Condensate drain
SV 3-bar safety valve drain cock
Dimensions for connection to base
hydraulic kit (option)
Dimensions for connection to “plus”
hydraulic kit (option)
g. 6
Model KC

17
Hot water supply ΔT 45°C = 10.0 l/min
Hot water supply ΔT 40°C = 11.2 l/min
Hot water supply ΔT 35°C = 12.9 l/min
Hot water supply ΔT 30°C = 15.0 l/min *
Hot water supply ΔT 25°C = 18.0 l/min *
*Note: water mixed at tap
700
250
M
MB GRB
R
81
91
114 31
66 6260 67 82 63
152,5
126
52
245
400
S
SV
fig. 7
Model KRB
bottom view top view
G Gas inlet (1/2”)
M CH flow (3/4”)
MB Secondary flow to water cylinder (1/2”)
RB Secondary return from water cylinder (1/2”)
R CH return (3/4”)
S Condensate drain
SV 3-bar safety valve drain cock

18
700
250
M
GF
R
81
91
114 31
66 6260 67 82 63
152,5
126
52
245
400
S
SV
fig. 8
Model KR
bottom view top view
G Gas inlet (1/2”)
M CH flow (3/4”)
F Cold water inlet (1/2”)
R CH return (3/4”)
S Condensate drain
SV 3-bar safety valve drain cock

19
2.3. Boiler layout
1. Condensate trap
2. Modulating gas valve
3. Safety thermostat
4. CH temperature probe
5. Modulating fan
6. CH temperature probe
7. Main condensing heat exchanger
8. Ignition electrode
9. Air purging device
10. Combustion air intake system
11. Flue gas discharge system
12. Flue gas analysis test points
13. Flue gas thermostat on ue gas duct
14. Flue gas thermostat on heat exchanger
15. Flame sensing electrode
16. Expansion vessel
17. Fan management sensor
18. Air purging device
19. Pump
20. 3-bar safety valve
21. Unloading tap
22. Minimum pressure switch
23. Flow limiting device
24. Filling loop
25. Cold water ow switch with lter
26. Secondary plate exchanger
27. DHW probe
28. Automatic by-pass
29. Motorised 3-way diverter valve
S Condensate drain
G Gas intake
M CH system ow
C DHW outlet
F Water mains inlet
R CH system return
11
M
SC
FR
10
9
8
7
6
5
4
3
2
1
28 27 26 25
24
12
13
14
15
16
17
18
19
20
21
22
23
29
G
g. 5
fig. 10
1. Condensate trap
2. Modulation gas valve
3. Flow temperature twin sensor
4. Modulating fan
5. Primary condensing exchanger
6. Deaerator
7. Air intake duct
8. Flue gas duct
9. Flue gas analysis test points
10. Flue gas thermostat on venting duct
11. Flue gas probe on exchanger
12. Ignition/detection electrode
13. Expansion vessel
14. Fan management sensor
15. Return temperature probe
16. 3-bar safety valve
17. Minimum pressure gauge
18. Deaerator
19. Modulating circulation pump
20. Discharge cock
21. Automatic by-pass
22. Motorised 3-way valve
S Condensate drain
G Gas inlet
M CH system ow
RB Water cylinder return
R CH system return
MB Water cylinder ow
8
M
7
6
5
4
3
2
1
21
9
10
11
12
13
14
16
19
22
1 sifone raccogli condensa
2 valvola gas modulante
3 doppio sensore di temperatura di mandata
4
5
ventilatore modulante
6
7
scambiatore primario condensante
8
9
disareatore
10
condotto aspirazione aria
11
condotto evacuazione fumi
12
prese analisi fumi
13
termostato fumi su condotto d’evacuazione
14
termostato fumi su scambiatore
16
elettrodo di accensione e rilevazione
17
vaso d’espansione
18
sensore controllo ventilatore
19
disareatore
20
circolatore 3 velocità manuali
21
22
sensore di pressione
rubinetto di scarico
by-pass automatico
valvola a 3 vie motorizzata
Mmandata riscaldamento
Ggas
MB mandata bollitore
RB ritorno bollitore
Rritorno riscaldamento
Sscarico condensa
G
20
17
18
valvola di sicurezza 3 bar
15
15 sensore di temperatura di ritorno
SMB RB R
Model KRB

20
2.4. Operating data
Burner pressures must be veried after a three minute boiler operation time
fig. 11
1. Condensate trap
2. Modulation gas valve
3. Flow temperature twin sensor
4. Modulating fan
5. Primary condensing exchanger
6. Deaerator
7. Air intake duct
8. Flue gas duct
9. Flue gas analysis test points
10. Flue gas thermostat on venting duct
11. Flue gas probe on exchanger
12. Ignition/detection electrode
13. Expansion vessel
14. Fan management sensor
15. Return temperature probe
16. 3-bar safety valve
17. Minimum pressure gauge
18. Deaerator
19. Circulation pump
20. Discharge cock
21. Automatic by-pass
S Condensate drain
G Gas inlet
M CH system ow
F Cold water inlet
R CH system return
8
M
7
6
5
4
3
2
1
21
9
10
11
12
13
14
16
19
1 sifone raccogli condensa
2 valvola gas modulante
3 doppio sensore di temperatura di mandata
4
5
ventilatore modulante
6
7
scambiatore primario condensante
8
9
disareatore
10
condotto aspirazione aria
11
condotto evacuazione fumi
12
prese analisi fumi
13
termostato fumi su condotto d’evacuazione
14
termostato fumi su scambiatore
16
elettrodo di accensione e rilevazione
17
vaso d’espansione
18
sensore controllo ventilatore
19
disareatore
20
circolatore 3 velocità manuali
21
sensore di pressione
rubinetto di scarico
by-pass automatico
Mmandata riscaldamento
Ggas
Fingresso acqua fredda
Rritorno riscaldamento
Sscarico condensa
G
20
17
18
valvola di sicurezza 3 bar
15
15 sensore di temperatura di ritorno
SFR
Model KR
KC 24
Gas type
Max. CH
heat input
[kW]
CH
heat output
(80-60°C)
[kW]
CH
heat output
(50-30°C)
[kW]
DHW output [kW] Gas mains pres-
sure [mbar]
Nozzle
[mm/100]
Flue gas
CO2
[%]
min max min max min max
Natural gas G20 23.7 2.7 22.9 3.2 24.9 3.0 27.4 20 3.70 9.0 ÷ 9.3
Propane Gas G31 23.7 2.7 22.9 3.2 24.9 3.0 27.4 37 3.00 9.8 ÷ 10.1
Table 4 – KC 24 model adjustment rates
Hot water supply ΔT 45°C = 9,0 l/min
Hot water supply ΔT 40°C = 10,1 l/min
Hot water supply ΔT 35°C = 11,6 l/min
Hot water supply ΔT 30°C = 13,5 l/min *
Hot water supply ΔT 25°C = 16,2 l/min *
*Note: water mixed at tap
KC 12
Gas type
Max. CH
heat input
[kW]
CH
heat output
(80-60°C)
[kW]
CH
heat output
(50-30°C)
[kW]
DHW output [kW] Gas mains pres-
sure [mbar]
Nozzle
[mm/100]
Flue gas
CO2
[%]
min max min max min max
Natural gas G20 12 1.8 11.6 2.1 12.6 2.0 18.4 20 3.05 9.0 ÷ 9.3
Propane Gas G31 12 1.8 11.6 2.1 12.6 2.0 18.4 37 2.50 10.0 ÷ 10.3
Table 3 – KC 12 model adjustment rates
Hot water supply ΔT 45°C = 5,73 l/min
Hot water supply ΔT 40°C = 6,45 l/min
Hot water supply ΔT 35°C = 7,37 l/min
Hot water supply ΔT 30°C = 8,6 l/min *
Hot water supply ΔT 25°C = 10,32 l/min *
*Note: water mixed at tap