Fondital FORMENTERA CTN 24 Quick start guide

IST 03 C 548 - 01
INSTALLATION, USE AND MAINTENANCE
FORMENTERA
CTN 24 - 28
RTN 24 - 28
CTFS 24 - 28 - 32
RTFS 24 - 28 - 32
EN

2
Dear Sirs,
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.
We inform users that:
t boilers shall be installed by an authorised company in full compliance with the prevailing standards;
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concerning the performed installation;
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3
General notes for installers, maintenance technicians, and users
This instruction manual is an integral and essential part of the product. It shall be supplied by the installer to the user who shall keep it carefully to
consult it whenever necessary.
This document shall be supplied together with the equipment in case the latter is sold or transferred to others.
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The equipment shall be installed in compliance with the prevailing standards and in accordance with the manufacturer’s instructions specied in
this manual:
the manufacturer will not be held responsible for a wrong installation causing damages to persons, animals and/or property.
Damage and/or injury caused by incorrect installation or use and/or damage and/or injury due to non-observance of the manufacturer’s
instructions shall release the manufacturer from any and all contractual and extra-contractual liability.
Before installing the boiler, check that the technical data correspond to the requirements for its correct use in the system.
Check that the boiler is intact and it has not been damaged during transport and handling. Do not install equipment which is clearly damaged and/
or faulty.
Do not obstruct the air intake openings.
Only original accessories or optional kits (including the electric ones) are to be installed.
Properly dispose of the packaging as all the materials can be recycled. The packaging must therefore be sent to specic waste management sites.
The packages can be dangerous for children so keep them out of their reach.
In the event of failure and/or faulty functioning, switch o the boiler. Do not attempt to make repairs: contact qualied technicians.
Original 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/or property.
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Appropriate maintenance will keep the boiler working in optimum conditions, ensuring environmental protection and total
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The user is strongly advised to have the boiler serviced and repaired by a qualied Authorised Service Centre.
In the event of long periods of inactivity of the boiler, disconnect it from power mains and close the gas cock.
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Should there be a risk of freezing, add anti-freeze: 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.
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- 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 cock;
- open doors and windows;
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The boiler is designed for installation in the countries indicated on the technical data plate: installation in any other country
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4
RAPID OPERATING INSTRUCTIONS
The following instructions will help you to switch the boiler on quickly and regulate it for immediate use.
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This manual contains full details of how the boiler works, and full operating and safety instructions.
 Open the gas cock installed ahead of the boiler.
Turn the master switch installed ahead of the boiler ON: the boiler display (g. 1) turns on.
If you do not wish to activate the heating function, press the “operating mode selection”button until symbol
is displayed: only the DHW function will be enabled.
If you wish to activate both the heating and DHW functions, press the “operating mode selection” button until
symbol is displayed .
If you do not wish to activate the DHW function, press the “operating mode selection” button a few times
until symbol is displayed: this will activate the CH function only.
To set the DHW water temperature press DHW +/- buttons (A, g. 1). Set temperature as required.
To set the heating water temperature, press heating water +/- buttons (B, g. 1). Set temperature as required.
8. Set the desired temperature on the (optional) ambient thermostat in the building.
The boiler is now ready to operate.
If the boiler shuts down, press “reset” button (C, g. 1).
If boiler does not resume its normal operation after 3 attempts, contact a qualied Service Centre.

5
CONTENTS
Warnings page 2
General notes for installers, maintenance technicians, and users page 3
Rapid operating instructions page 4
*OTUSVDUJPOTGPSUIFVTFS............................................................................................................................................................................................................................................................ page 7
1.1 - Control panel .................................................................................................................................................................................................................................................................. page 7
1.2. Selecting the operating mode.................................................................................................................................................................................................................................... page 8
1.3. Adjusting heating and DHW temperature ............................................................................................................................................................................................................. page 9
1.4. Parameter display ............................................................................................................................................................................................................................................................ page 9
1.5. Interpreting BOILER STATUS from LCD DISPLAY INDICATIONS ...................................................................................................................................................................... page 10
1.6. Failures that cannot be reset ....................................................................................................................................................................................................................................... page 13
1.7. Boiler reset.......................................................................................................................................................................................................................................................................... page 13
1.8. Boiler operation ................................................................................................................................................................................................................................................................ page 14
1.8.1. Switching on ..................................................................................................................................................................................................................................................... page 14
1.8.2. CH function......................................................................................................................................................................................................................................................... page 14
1.8.3. DHW function................................................................................................................................................................................................................................................... page 14
1.8.4. ANTIFREEZE function..................................................................................................................................................................................................................................... page 15
1.8.4.1 Flow anti-freeze function ................................................................................................................................................................................................................ page 15
1.8.4.2 Plate DHW anti-freeze function .................................................................................................................................................................................................... page 15
1.8.4.3 Boiler anti-freeze function .............................................................................................................................................................................................................. page 15
1.8.5. Anti-seize function ........................................................................................................................................................................................................................................... page 16
1.8.6. Operation with external probe (optional) ............................................................................................................................................................................................... page 16
1.8.7. Operation with Remote Control (optional) ............................................................................................................................................................................................ page 16
1.9. Boiler shut-down.................................................................................................................................................................................................................................................. page 16
1.9.1. Burner shut-down ............................................................................................................................................................................................................................................ page 16
1.9.2 Shutdown due to overheating...................................................................................................................................................................................................................... page 16
1.9.3. Shut-down due to incorrect air/ue gas system draught.................................................................................................................................................................. page 16
1.9.4 Shutdown due to too low system pressure ............................................................................................................................................................................................. page 17
1.9.5. Alarm due to temperature probe malfunction...................................................................................................................................................................................... page 18
1.9.6. Alarm due to Remote Control (optional) connection malfunction................................................................................................................................................ page 18
1.10. Maintenance ................................................................................................................................................................................................................................................................... page 18
1.11. Notes for the user .......................................................................................................................................................................................................................................................... page 18
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2.1. Technical features............................................................................................................................................................................................................................................................. page 19
2.2. Dimensions......................................................................................................................................................................................................................................................................... page 20
2.3. Boiler layouts ..................................................................................................................................................................................................................................................................... page 24
2.4. Operating data.................................................................................................................................................................................................................................................................. page 26
2.5. General characteristics................................................................................................................................................................................................................................................... page 27
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3.1. Installation standards ..................................................................................................................................................................................................................................................... page 29
3.2. Installation ......................................................................................................................................................................................................................................................................... page 29
3.2.1. Packaging ............................................................................................................................................................................................................................................................ page 29
3.2.2. Choosing where to install the boiler ........................................................................................................................................................................................................ page 29
3.2.3. Positioning the boiler...................................................................................................................................................................................................................................... page 29
3.2.4. Installing the boiler.......................................................................................................................................................................................................................................... page 31
3.2.5. Boiler room ventilation................................................................................................................................................................................................................................... page 31
3.2.6. Air intake/ue gas venting system for natural draught boilers ....................................................................................................................................................... page 31
3.2.7. Air intake/ue gas venting system for forced draught boilers......................................................................................................................................................... page 32
3.2.7.1. Conguration of air intake and ue gas venting ducts....................................................................................................................................................... page 33
3.2.7.2. Air intake and ue gas venting via 100/60 mm coaxial pipes........................................................................................................................................... page 34
3.2.7.3. Air intake and ue gas venting via 80 mm split pipes......................................................................................................................................................... page 36
3.2.8. Checking combustion efficiency ................................................................................................................................................................................................................ page 37
3.2.8.1. Flue cleaning function..................................................................................................................................................................................................................... page 37
3.2.8.2. Measurement procedure ............................................................................................................................................................................................................... page 38
3.2.9. Connection to gas mains ............................................................................................................................................................................................................................... page 38
3.2.10. Hydraulic connections.................................................................................................................................................................................................................................. page 38
3.2.11. Connection to the electrical mains.......................................................................................................................................................................................................... page 39
3.2.12. Connection to ambient thermostat (optional).................................................................................................................................................................................... page 39
3.2.13. Installation and operation with Open Therm Remote Control (optional)................................................................................................................................. page 39
3.2.14. Installation of the (optional) external probe and sliding temperature operation.................................................................................................................. page 39
3.2.15. TSP parameters that can be set from interface or Remote Control ............................................................................................................................................. page 41
3.3. Filling the system.............................................................................................................................................................................................................................................................. page 44
3.4. Starting up the boiler...................................................................................................................................................................................................................................................... page 44
3.4.1. Preliminary checks ........................................................................................................................................................................................................................................... page 44
3.4.2. Switching on and switching o................................................................................................................................................................................................................... page 44
3.5. Circulation pump ow resistance............................................................................................................................................................................................................................... page 45
3.6. Wiring diagrams................................................................................................................................................................................................................................................................ page 47
3.6.1 Model CTFS.......................................................................................................................................................................................................................................................... page 47
3.6.2. Model CTN........................................................................................................................................................................................................................................................... page 49
3.6.3. Wiring diagram for forced circulation solar system with combi boiler ......................................................................................................................................... page 50
3.6.4 Solar collector anti-freeze function............................................................................................................................................................................................................. page 51
3.6.5. Collector heat transfer function .................................................................................................................................................................................................................. page 51
3.6.6. Boiler cooling function ................................................................................................................................................................................................................................... page 51
3.6.7. Solar mode operation and failure signal.................................................................................................................................................................................................. page 51
3.6.8. Wiring diagram for natural circulation solar system with combi boiler........................................................................................................................................ page 52
3.6.9. Model RTN........................................................................................................................................................................................................................................................... page 53
3.6.10. Wiring diagram for forced circulation solar system with CH only boiler.................................................................................................................................... page 54
3.6.11. Model RTFS....................................................................................................................................................................................................................................................... page 55
3.6.12. Multifunction relay setting diagrams...................................................................................................................................................................................................... page 57
3.7. Adaptation to other gas types and burner adjustment..................................................................................................................................................................................... page 59
3.7.1. Switching from NATURAL GAS to LPG ...................................................................................................................................................................................................... page 59
3.7.2. Switching from LPG to NATURAL GAS ...................................................................................................................................................................................................... page 61
3.7.3. Gas valve setting............................................................................................................................................................................................................................................... page 61
3.7.3.1. Maximum heat output adjustment............................................................................................................................................................................................ page 61
3.7.3.2. Minimum heat output adjustment............................................................................................................................................................................................. page 61
3.7.3.3. Final settings....................................................................................................................................................................................................................................... page 61
5FTUJOHUIFCPJMFS page 63
4.1. Preliminary checks........................................................................................................................................................................................................................................................... page 63
4.2. Switching on and switching o .................................................................................................................................................................................................................................. page 63
.BJOUFOBODF  page 64
5.1. Maintenance schedule................................................................................................................................................................................................................................................... page 64
5.2. Combustion analysis....................................................................................................................................................................................................................................................... page 64
5SPVCMFTIPPUJOH page 65

6
FIGURE INDEX
fig. 1 - Control panel............................................................................................................................................................................................................................................................................page 7
fig. 2 - Filler cock ................................................................................................................................................................................................................................................................................page 17
fig. 3 - CTN dimensions ......................................................................................................................................................................................................................................................................page 20
fig. 4 - CTFS dimensions.....................................................................................................................................................................................................................................................................page 21
fig. 5 - RTN dimensions ......................................................................................................................................................................................................................................................................page 22
fig. 6 - RTFS dimensions.....................................................................................................................................................................................................................................................................page 23
fig. 7 - CTN hydraulic diagram.........................................................................................................................................................................................................................................................page 24
fig. 8 - CTFS hydraulic diagram .......................................................................................................................................................................................................................................................page 24
fig. 9 - RTN hydraulic diagram.........................................................................................................................................................................................................................................................page 25
fig. 10 - RTFS hydraulic diagram.....................................................................................................................................................................................................................................................page 25
fig. 11 - Paper template......................................................................................................................................................................................................................................................................page 30
fig. 12 - Connection to chimney for models CTN and RTN...................................................................................................................................................................................................page 32
fig. 13 - Dimensions for connection of models CTN and RTN to flue gas duct..............................................................................................................................................................page 32
fig. 14 - Coaxial kit 0KITCONC00......................................................................................................................................................................................................................................................page 35
fig. 15 - Air intake/flue gas venting via coaxial pipes CTFS ...................................................................................................................................................................................................page 35
fig. 16 - Dimensions for connection to coaxial air intake/ue gas duct CTFS ................................................................................................................................................................page 35
fig. 17 - Splitter kit 0SDOPPIA11......................................................................................................................................................................................................................................................page 36
fig. 18 - Examples of combustion efficiency sampling points..............................................................................................................................................................................................page 38
fig. 19 - Connection to gas mains...................................................................................................................................................................................................................................................page 38
fig. 20 - Thermoregulation curves ..................................................................................................................................................................................................................................................page 40
fig. 21 - CTN/RTN 24-28 and CTFS/RTFS 24 available head...................................................................................................................................................................................................page 45
fig. 22 - CTFS/RTFS 28-32 available head.....................................................................................................................................................................................................................................page 46
fig. 23 - CTFS wiring diagram ...........................................................................................................................................................................................................................................................page 47
fig. 24 - CTN wiring diagram.............................................................................................................................................................................................................................................................page 49
fig. 25 - Wiring diagram for forced circulation solar system with combi boiler .............................................................................................................................................................page 50
fig. 26 - Multifunction relay connecting diagram.....................................................................................................................................................................................................................page 51
fig. 27 - Wiring diagram for natural circulation solar system with combi boiler............................................................................................................................................................page 52
fig. 28 - Multifunction relay wiring diagram...............................................................................................................................................................................................................................page 52
fig. 29 - RTN wiring diagram.............................................................................................................................................................................................................................................................page 53
fig. 30 - Wiring diagram for forced circulation solar system with CH only boiler ..........................................................................................................................................................page 54
fig. 31 - Multifunction relay wiring diagram...............................................................................................................................................................................................................................page 54
fig. 32 - RTFS wiring diagram ...........................................................................................................................................................................................................................................................page 55
fig. 33 - Relay with Remote Control and TA2 ..............................................................................................................................................................................................................................page 57
fig. 34 - Relay with interface programming and TA2 ...............................................................................................................................................................................................................page 57
fig. 35 - Relay with remote request (P17=1)................................................................................................................................................................................................................................page 57
fig. 36 - Relay with request (P17=3)...............................................................................................................................................................................................................................................page 57
fig. 37 - Relay with alarm signal (P17=0)......................................................................................................................................................................................................................................page 58
fig. 38 - Casing removal......................................................................................................................................................................................................................................................................page 59
fig. 39 - Expansion tank mounting bracket removal................................................................................................................................................................................................................page 59
fig. 40 - Expansion tank bracket......................................................................................................................................................................................................................................................page 60
fig. 41 - Combustion chamber removal........................................................................................................................................................................................................................................page 61
fig. 42 - Adaptation to other gas types - Gas valve modulation coil..................................................................................................................................................................................page 62
fig. 43 - Adaptation to other gas types - Pressure measurement point............................................................................................................................................................................page 62
fig. 44 - Adaptation to other gas types - Gas valve setting....................................................................................................................................................................................................page 62
TABLE INDEX
Table 1 - Displayable symbols on LCD display ..........................................................................................................................................................................................................................page 7
Table 2 - Displayable parameters with “info” button...............................................................................................................................................................................................................page 10
Table 3 - BOILER STATUS - LCD DISPLAY INDICATIONS during normal operation........................................................................................................................................................page 10
Table 4 - BOILER STATUS - LCD INDICATIONS in the event of malfunction ....................................................................................................................................................................page 11
Table 5 - CTN-RTN 24 adjustment rates.......................................................................................................................................................................................................................................page 26
Table 6 - CTN-RTN 28 adjustment rates ......................................................................................................................................................................................................................................page 26
Table 7 - CTFS-RTFS 24 adjustment rates ...................................................................................................................................................................................................................................page 26
Table 8 - CTFS-RTFS 28 adjustment rates ...................................................................................................................................................................................................................................page 26
Table 9 - CTFS-RTFS 32 adjustment rates ...................................................................................................................................................................................................................................page 27
Table 10 - General specifications....................................................................................................................................................................................................................................................page 27
Table 11 - Combustion specifications CTN-RTN 24 .................................................................................................................................................................................................................page 27
Table 12 - Combustion specifications CTN-RTN 24..................................................................................................................................................................................................................page 27
Table 13 - Combustion specifications CTFS-RTFS 24...............................................................................................................................................................................................................page 28
Table 14 - Combustion specifications CTFS-RTFS 28...............................................................................................................................................................................................................page 28
Table 15 - Combustion specifications CTFS-RTFS 32...............................................................................................................................................................................................................page 28
Table 16 - Congurable limits for TSP parameters and default values..............................................................................................................................................................................page 41
Table 17 - Relationship between “Temperature and Nominal resistance” for temperature probes.......................................................................................................................page 58
Table 18 - P00 parameter setting....................................................................................................................................................................................................................................................page 61

7
 */4536$5*0/4'035)&64&3
 $POUSPMQBOFM
" Domestic hot water set buttons.
# Hot water for heating purposes and parameter set buttons.
$ Buttons for alarm reset and back to the starting page during parameter selection.
% Parameter conrmation and information request button.
& Operating status selection button.
To gain access to the interface, touch the display area. Once active, the interface enables all the keys. 15 seconds after the last key has been
touched, the interface disables all the keys.
g. 1
AB
C D E
4:.#0- 45&"%: '-"4)*/(
1Percentage indication
2Indication of “parameter” inside the parameter menu
3Displaying of the number of parameters, or of the system pressure, or
of the burner power percentage
4Indication of system pressure measurement unit
5Temperature, value, parameter and fault display.
6Indication of the centigrade degrees.
7A DHW request is active. Set DHW
temperature display.
8A CH request is active. Display of set heating
ow temperature.
9Symbols for instantaneous DHW, heating.
Symbol ON = function enabled, OFF = function disabled.
10 Displaying of the calculated temperature setpoint
11 The solar pump or solar valve is active
12 Display of the ue cleaning function. It indicates that you are
entering the ue cleaning function.
13 During parameter editing, the wrench symbol stays
on until the set datum is conrmed.
14 Flame ON indication
Table 1 - Displayable symbols on LCD display
1
4
3
6
5
7
8
2
12
9
13
14
10
11

8
 4FMFDUJOHUIFPQFSBUJOHNPEF
Every time the “operating status selection” button (E, g.1) is pressed, the SUMMER , WINTER , CH ONLY and OFF modes are
enabled in sequence.
At this stage, all buttons are enabled.
When the SUMMER mode is enabled, only the DHW production function is active.
When the $)0/-: mode is enabled, only the heating water production function is active.
When the WINTER mode is enabled, both functions are active: DHW production and heating water production.
When the OFF mode is enabled, no function is active.
01&3"5*/(45"5640'' 46..&301&3"5*/(45"564
01&3"5*/(45"5648*/5&3 01&3"5*/(45"564$&/53"-
)&"5*/(0/-:

9
 "EKVTUJOHIFBUJOHBOE%)8UFNQFSBUVSF
Press the DHW +/- button (A, g.1) to select the desired domestic hot water temperature. During selection, DHW icon (7, g. 1) will ash. As soon as
button is released, icon will continue ashing for approx. 3 seconds, and the DHW value will ash as well. After this time, value is stored and display
standard operation will be restored.
Press the CH +/- button (B, g.1) to select the desired CH ow water temperature. During selection, CH icon (8, g. 1) will ash. As soon as button
is released, icon will continue ashing for approx. 3 seconds, and the CH water value will ash as well. After this time, value is stored and display
standard operation will be restored. At this stage, all buttons are enabled.
%)85&.1&3"563&4&-&$5*0/
$)5&.1&3"563&4&-&$5*0/
 1BSBNFUFSEJTQMBZ
Press “Info” (D, g.1) to scroll the dierent parameter values. You can quit this function at any time by simply pressing the “Reset”button (C, g.1).
Table 2 describes the meaning of all displayable parameters.

10
 *OUFSQSFUJOH#0*-&345"564GSPN-$%%*41-":*/%*$"5*0/4
Normal operation
Boiler switch in OFF mode
#PJMFSTXJUDIJO46..&3PS8*/5&3NPEFPS$)0/-:
No active function
The ow water temperature is displayed
Boiler switch in SUMMER or WINTER mode
%)8GVODUJPOBDUJWF(for CTFS / CTN models, only)
The ow water temperature is displayed
#PJMFSTXJUDIJO8*/5&3NPEFPS$)0/-:
$)GVODUJPOBDUJWF
The ow water temperature is displayed
Boiler switch in SUMMER or WINTER mode
&YUFSOBMXBUFSDZMJOEFSFOBCMFE%)8GVODUJPOBDUJWF
The ow water temperature is displayed
For RTN model with external water cylinder (optional), only
Table 3 - BOILER STATUS - LCD DISPLAY INDICATIONS during normal operation
WINTER
)&"5*/(0/-:
WINTERSUMMER
WINTERSUMMER
)&"5*/(0/-:
PARAMETERS DESCRIPTION
P30 - TSP30 External temperature displaying (if an external probe is present).
P31 Flow temperature displaying.
P32
Calculated nominal ow temperature displaying.
If no external probe is installed, the ow temperature manually set on boiler will be displayed. If an external probe is installed,
the ow temperature boiler calculated through the curves on gure 18 will be displayed.
P42 Domestic hot water temperature displaying (for CTN and CTFS models).
P44 Water cylinder temperature displaying (if the water cylinder probe is installed).
P46 Solar collector temperature displaying (if the collector probe is installed).
P47 Solar valve temperature displaying (if the solar valve probe is installed).
Table 2 - Displayable parameters with “info” button
WINTERSUMMER

11
Malfunction
No ame
Triggering of double ow probe
Triggering of ue gas thermostat (RTN / CTN)
Triggering of air pressure switch (CTFS / RTFS)
Insucient system pressure
Flow probe failure
DHW probe failure (CTN / CTFS)
Too high system pressure
Boiler probe failure
(RTN / RTFS with water cylinder, optional, equipped with NTC probe)
SCS Solar collector probe failure (optional, if connected)
SVS Solar valve probe failure (optional, if connected)
SBS Solar water cylinder probe failure (optional, if connected)
Remote Control connection failure (optional, if connected: this error appears only on the
Remote Control display)
Triggering of safety thermostat in mixed zone 2 (optional, if connected)
Mixed zone ow probe 2 failure (optional, if connected)
Mixed zone ow probe 3 failure (optional, if connected)
Mixed zone ow probe 4 failure (optional, if connected)
Communication failure with peripheral boards (optional, if connected: zone board and solar
board)
Hydraulic conguration not allowed
Zone conguration error (optional, if connected: Remote Control and ambient thermostat)
Pressure transducer fault
Communication error between main board and touch screen
Safety system hardware malfunction

12
Boiler type recognition failure (TN or TFS)
Gas valve modulation coil fault
Max. number of reset attempts from touch screen reached
Max. number of reset attempts from Remote Control reached (optional, if connected)
Table 4 - BOILER STATUS - LCD INDICATIONS in the event of malfunction

13
 'BJMVSFTUIBUDBOOPUCFSFTFU
The display shows the failure based on the corresponding error code (table 4). Some failures can be reset through the“reset” button, while some
others are self-resettable. Refer to the following paragraph (“Boiler reset”).
If failures cannot be reset but are of the self-resettable type, no key will be enabled and only the LCD backlighting will be on. As soon as the error
cause is eliminated, the failure signal will disappear from the interface, this latter will be enabled and, 15 seconds after no key is touched, all the
keys but the one around the LCD will be disabled.
 #PJMFSSFTFU
The display shows the failure based on the corresponding error code (table 4). Some failures can be reset through the reset key, while some others
are self-resettable.
If shut-downs can be reset (E01, E02, E03) the reset key and the touch screen backlighting will always be on; the only active key that can be pressed
is “reset”.
When the reset key is pressed and boiler is under the correct conditions, the error is reset. The failure signal will disappear from the interface, this
latter will be enabled and, 15 seconds after no key is touched, all the keys but the one around the LCD will be disabled.

14
 #PJMFSPQFSBUJPO
 4XJUDIJOHPO
*UJTQSFTVNFEUIBUUIFCPJMFSIBTCFFOJOTUBMMFECZBRVBMJöFEJOTUBMMFSJUIBTCFFODPNNJTTJPOFEBOEJTSFBEZUPPQFSBUF
DPSSFDUMZ
- Open the gas stop cock;
- turn the master switch installed ahead of the boiler ON. The display turns on and indicates the function currently active (see tables 3 and 4);
- select boiler operation mode by pressing the “operating status selection” button on the touch-screen (E, g. 1): OFF, SUMMER, WINTER, CH ONLY
(par. 1.2).
- set desired CH temperature (see par. 1.8.2.);
- set desired DHW temperature (see par. 1.8.3.);
- set desired temperature on the (optional) ambient thermostat in the building.
WARNING
"GUFSBQSPMPOHFEQFSJPEXJUIUIFCPJMFSOPUJOVTFBOEXJUI-1(öSFECPJMFSTJOQBSUJDVMBSTPNFTUBSUJOHEJóDVMUZNBZCFFODPVOUFSFE
#FGPSFTUBSUJOHUIFCPJMFSTXJUDIPOBOPUIFSHBTQPXFSFEEFWJDFFHLJUDIFOSBOHF
#FXBSFUIBUFWFOCZGPMMPXJOHUIJTQSPDFEVSFUIFCPJMFSNJHIUTUJMMFYQFSJFODFTPNFTUBSUJOHEJóDVMUJFTBOETIVUEPXOPODFPSUXJDF
3FTFUCPJMFSPQFSBUJPOCZQSFTTJOHUIFiSFTFUwCVUUPO$öH
 $)GVODUJPO
Set desired CH water temperature via heating +/- buttons (B, g. 1).
CH temperature may be set within a range from 35°C to 78°C.
The waiting time between one boiler ignition and the following one, used to prevent boiler frequent turning on and o, ranges between 0 and 10
minutes (default value: 4 minutes), and can be edited with the P11 parameter.
During temperature setting, the CH symbol (8, g. 1) on the screen ashes and the CH current setting is displayed.
When the central heating system requests heat from the boiler, the LCD displays the CH symbol (steady on) (8, g. 1) and the current heating ow
water temperature. The burner on symbol (14, g. 1) only shows while the burner is operating.
Should water temperature in the system fall below set minimum value, between 35°C and 78°C (default value 40°C) to be edited with the P27
parameter, the waiting time is reset and the boiler re-ignites.
 %)8GVODUJPO
Set desired DHW water temperature via“DHW +/-” buttons (A, g. 1).
The DHW production function is enabled on CTFS / CTN models and on RTFS / RTN models with external water cylinder (optional).
Such function has always priority over CH water supply.
For CTFS / CTN models, DHW temperature may be set within a range from 35 °C to 57 °C.
During temperature setting, the DHW symbol (7, g. 1) on the display ashes and the DHW setting is displayed.
In RTN / RTFS models with external water cylinder (optional), water cylinder production of DHW can be enabled or disabled by pressing button
“Operating mode selection” on the touch-screen (E, g. 1).
Water cylinder is enabled when boiler is in one of the following operating modes: SUMMER, WINTER.
For RTN / RTFS models with external water cylinder (optional) with NTC probe (10 kQ @ ß=3435; refer to water cylinder technical specications),
temperature range is between 35 °C and 65 °C. When setting temperature, the DHW symbol (7, g. 1) will ash on the display and the DHW value
being set will be shown.
In RTN / RTFS models featuring an external water cylinder (optional) it is not possible to use a thermostat. A probe must be inserted in the boiler
instead. This decision was made in order to reduce gas consumption.
In RTN / RTFS models featuring an external water cylinder (optional) tted with a water cylinder probe (optional), once every 15 days the anti-
legionnaires disease function is activated: this consists in heating the water of the external cylinder up to 65 °C for 30 minutes, regardless of all the
other settings.
The burner on symbol (14, g. 1) only shows while the burner is operating.

15
With CTFS and CTN models, available DHW litres per minute depend on boiler heat output and water mains supply temperature, according to the
following formula:
l = DHW litres per min. = --------
where K is:
- 336 for CTN 24 model
- 405 for CTN 28 model
- 348 for CTFS 24 model
- 426 for CTFS 28 model
- 453 for CTFS 32 model
T = hot water temperature – cold water temperature
For instance, with model CTFS 24, if the cold water is at 8°C and you want hot water at 38°C for a shower, the value of T is:
∆T = 38°C - 8°C = 30°C
and the number of DHW litres per minute available at 38°C is:
348
l = ------ = 11.6 [litres per minute] (water mixed at cock)
30
 "/5*'3&&;&GVODUJPO
This boiler is tted with an anti-freeze protection system, which works when the following functions are activated: “OFF/SUMMER/WINTER/CH ONLY”.
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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.
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In case burner cannot be ignited due to the lack of gas, the anti-freeze functions are anyway enabled through the circulation pumps.
 'MPXBOUJGSFF[FGVODUJPO
When the heating water temperature sensor 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.
 1MBUF%)8BOUJGSFF[FGVODUJPO
On the CTFS / CTN models, the anti-freeze function also protects the DHW plant.
When the DHW temperature sensor detects a temperature of 5°C, the boiler switches on and stays on at its minimum heat output until the tem-
perature reaches 10°C or 15 minutes have elapsed (the deviating valve is in the DHW position).
During the DHW anti-freeze operation the temperature detected by the ow probe is constantly checked, and in case it reaches 60°C the burner is
switched o. The burner is switched on again if the operation request in anti-freeze mode is still present and the ow temperature is below 60°C.
The pump continues to operate even if the boiler shuts down.
 #PJMFSBOUJGSFF[FGVODUJPO
In RTN / RTFS models featuring an external water cylinder (optional) for the production of DHW with a NTC type temperature sensor (10 kQ @
ß=3435; refer to water cylinder technical specications) the anti-freeze function also protects the water cylinder. When water cylinder temperature
sensor detects a water temperature of 5°C, the boiler switches on and stays on at its minimum heating output until the temperature of the water
cylinder water reaches 10°C or 15 minutes have elapsed. The pump continues to operate even if the boiler shuts down.
During the boiler antifreeze operation the temperature detected by the ow probe is constantly checked, and in case it reaches 60°C the burner is
switched o. The burner is switched on again if the operation request in anti-freeze mode is still present and the ow temperature is below 60°C.
K
T

16
 "OUJTFJ[FGVODUJPO
If the boiler remains inactive and connected to the power mains, the circulation pump and the deviating valve will be shortly enabled every
24 hours so as to avoid any shut-down. The same applies to the relay which can be freely programmed whenever this latter is used to power a
recirculation pump or a deviating valve.
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Boiler can be connected to a probe measuring the external temperature (optional - not compulsory, supplied by the manufacturer). Once the
external temperature value is known, the boiler will automatically adjust the heating water temperature: increasing it as the external temperature
decreases and decreasing it as the external temperature increases. This will both improve room comfort and reduce fuel consumption.
This boiler operating mode is called “sliding temperaturae operation”.
Heating water temperature varies based on a programme written inside boiler electronic microprocessor.
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calculated ambient temperature, namely the desired theoretical temperature.
During temperature setting, the calculated ambient temperature symbol ashes on the display (10, g. 1) and the value being set is shown.
For curve optimal setting, a position close to 20° C is recommended. For further details on sliding temperature, refer to paragraph 3.2.14.
Only original external temperature probes supplied by the manufacturer must be used.
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NBOBHJOHFMFDUSPOJDTNBZBòFDUCPJMFSBOEFYUFSOBMQSPCFPQFSBUJPO
 0QFSBUJPOXJUIPQUJPOBMSFNPUFDPOUSPM
Boiler interface includes all the possible functions of a Fondital Remote Control, and can control up to two heating zones.
User can also connect the boiler to a Remote Control (optional - not compulsory, supplied by the manufacturer) so as to manage several boiler
parameters, such as:
- boiler status;
- ambient temperature selection;
- CH system water temperature;
- DHW system water temperature;
- CH system or external heater (optional) activation times programming;
- boiler diagnostics display;
- boiler reset and other parameters.
For instructions on how to connect the Remote Control, refer to par. 3.2.13 and to its own instruction booklet.
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5IFVTFPGOPOPSJHJOBMSFNPUFDPOUSPMTOPUTVQQMJFECZUIFNBOVGBDUVSFSNBZBòFDU3FNPUF$POUSPMBOECPJMFSPQFSBUJPO
 #PJMFSTIVUEPXO
The boiler shuts down automatically if a malfunction occurs. Refer to Tables 3 and 4 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 kinds of shut-down and the procedure to follow in each.
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Fault code E01 is displayed ashing on the display in the event of burner shut-down due to missing ame. If this happens, proceed as follows:
- check that the gas cock is open and light a kitchen gas ring for example to check the gas supply;
- once having checked if the fuel is available, press the “reset” button to restore burner operation (C, g. 1): if, after two starting attempts, the boiler
still fails to start and enters the shut-down 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.
 4IVUEPXOEVFUPPWFSIFBUJOH
In case of ow water overheating, the boiler shuts down and the E02 code will start ashing.
Contact a Service Centre or a qualied service engineer to carry out the maintenance.
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In case of burner shut-down due to ue operation fault (CTN / RTN models) or intake/ue gas pipes (CTFS / RTFS models), ashing code E03 is
displayed (ue gas thermostat or air pressure switch tripped).
Contact a Service Centre or a qualied service engineer to carry out the maintenance.

17
 4IVUEPXOEVFUPMPXXBUFSQSFTTVSF
If “shut-down due to insucient pressure in system”error E04 starts ashing (indicating pressure transducer triggering),
ll the system by opening the ller cock as shown in g. 2 (models CTFS / CTN) or the cock on the cold water supply pipe
(supplied with the boiler - model RTN / RTFS).
E04 error is displayed when system pressure drops below 0.4 bar and error will be automatically reset as soon as system
pressure reaches 1.0 bar.
Water pressure must be 1-1.3 bars while the boiler is cold.
In order to restore water pressure, proceed as follows:
- turn the lling cock (g. 2) anticlockwise to allow water to enter the boiler (models CTFS / CTN) or, for models RTN /
RTFS, open the cock on the cold water supply pipe;
- keep the cock open until the control panel shows a value of 1÷1,3 bar;
- turn cock clockwise to close it (modela CTFS / CTN) or, for models RTN / RTFS, close the cock on the cold water supply
pipe.
If the boiler still fails to operate, contact a Service Centre or a qualied service engineer.
Filler cock
g. 2
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Models
CTN - CTFS
Models
RTN - RTFS
Filler cock (option, 0KITRUBI01)

18
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The following fault codes are shown on the display in the event of burner shut-down due to a temperature probe fault:
- E05 for the CH ow probe.
In this case the boiler does not work.
- E06 for the DHW probe (CTFS / CTN models, only).
In this case, the boiler works in central heating mode only, and the DHW function is disabled.
- E12 for the water cylinder probe (RTN / RTFS model).
In this case, the boiler works in central heating mode only, and the DHW function is disabled.
In all cases, contact a Service Centre or a qualied engineer for maintenance.
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The boiler recognises whether or not there is a Remote Control (optional).
If the boiler does not receive information from the Remote Control after the Remote Control itself is connected, 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 touch screen and ignore the Remote Control settings.
Contact a Service Centre or a qualied service engineer to carry out the maintenance.
The remote control can indicate faults or shut-down conditions and can also restore boiler operation after shut-down up to a maximum of 5 times.
If the maximum number of attempts is reached, fault code E99 is shown on the boiler display. To reset error E99, disconnect and re-connect again
boiler from/to power mains.
 .BJOUFOBODF
The boiler must be serviced periodically as indicated in the relevant section of this manual.
Appropriate boiler maintenance ensures ecient operation, environment preservation, and safety for people, animals and objects.
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The user is strongly advised to have the boiler serviced and repaired by a qualied Authorised Service Centre.
For maintenance operations see section 5. Maintenance.
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Do not use water!
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5IFVTFSNBZPOMZBDDFTTQBSUTPGUIFCPJMFSUIBUDBOCFSFBDIFEXJUIPVUVTJOHTQFDJBMFRVJQNFOUPSUPPMT5IFVTFSJTOPUBVUIPSJTFEUP
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The manufacturer shall not be held responsible for damage to people, animals, or property due to tampering with or improper
JOUFSWFOUJPOUPUIFCPJMFS
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19
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The boiler is equipped with an integrated gas atmospheric burner.
All models are equipped with electronic ignition and ionisation ame sensing device.
The following models are available:
- CTN 24, 28: open chamber, natural draught boiler with electronic ignition for heating and instantaneous DHW supply (23.1-27.4 kW);
- RTN 24, 28: open chamber, natural draught boiler with electronic ignition for heating only (23.1-27.4 kW);
- CTFS 24, 28 ,32: sealed chamber, forced draught boiler with electronic ignition for heating and instantaneous DHW supply (23.7-28.6-30.8 kW);
- RTFS 24, 28, 32: sealed chamber, forced draught boiler with electronic ignition for heating only (23.7-28.6-30.8 kW);
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, adjustable).
- Electronic ame modulation in DHW mode (CTFS / CTN; RTN / RTFS
with external water cylinder - optional).
- DHW priority function (CTFS / CTN; RTN / RTFS with external water
cylinder - optional).
- Flow anti-freeze function: ON 5°C; OFF 30°C or after 15 minutes of
operation if CH temperature > 5 °C.
- DHW freeze protection function (CTFS / CTN): ON 5°C; OFF 10 °C or
after 15 minutes of operation if DHW temperature > 5 °C.
- Water cylinder anti-freeze function (RTN / RTFS + optional external
water cylinder with NTC probe): ON 5°C; OFF 10 °C or after 15 minutes of
operation if water cylinder temperature > 5 °C.
- Timer-controlled ue cleaning function: 15 minutes.
- Anti-legionaries disease function (RTN / RTFS + external water cylinder
- optional);
- CH Maximum heat input parameter adjustment.
- Ignition heat input adjustment parameter.
- Ignition ame propagation function.
- CH thermostat timer: 240 seconds (adjustable).
- Heating pump post-circulation function in CH, anti-freeze and ue
cleaning modes: 30 seconds (adjustable).
- DHW post-circulation function (CTFS / CTN; RTN / RTFS with external
water cylinder - optional): 30 seconds.
- Post-circulation function for heating temperature > 78 °C: 30 seconds.
- Post-ventilation function after working: 10 seconds.
- Post-ventilation function for CH temperature > 95°C.
- Circulation pump and deviating valve anti shut-down function: 30
seconds of operation after 24 hours of inactivity.
- Ready for connection to an ambient thermostat.
- 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.
- Ready for integration with solar panels.
- Anti- water hammer function: can be set from 0 to 3 seconds through
parameter P15.
User interface
- Touch interface with built-in LCD to display and control boiler
operating condition: OFF, RESET, WINTER, SUMMER and CH ONLY.
- CH water temperature regulator: 35-78°C.
- DHW water temperature regulator (CTN / CTFS): 35-57 °C.
Manufacturing characteristics
- IPX5D electrically protected control panel.
- Integrated, modulating electronic safety board.
- Electronic start-up with built-in igniter and ionisation ame detection.
- Stainless steel, atmospheric burner that can run on several gases.
- Mono-thermal, high performance, copper heat exchanger.
- Twin shutter modulating gas valve.
- 3-speed circulation pump with built-in air purging device.
- Heating circuit pressure sensor.
- CH temperature probe (all models) and DHW temperature probe
(CTFS / CTN).
- Flue gas thermostat (CTN / RTN).
- Air pressure switch (CTFS / RTFS).
- Integrated, automatic by-pass.
- 7 litre expansion vessel.
- Filler cock (CTN / CTFS) and drain cock (all models).
- Stainless steel plate DHW heat exchanger (CTFS / CTN).
- Motorised deviating valve (CTFS / CTN).
- DHW priority ow switch (CTN / CTFS).

20
 %JNFOTJPOT
76 60 62 67 82 73
121
185
154
131
M
AC GAF
R
210210
117
420 315
750
g. 3
AF Cold water inlet
GGas inlet
MCH system ow
AC Hot water outlet
RCH system return
BOTTOM VIEW TOP VIEW
Model CTN