Fondital ITACA RTFS 24 User manual

DIDACTIC MANUAL
FAMILY: Wall-hung boilers
GROUP: Instantaneous type and
forced draught heating
only
MODELS: Itaca
VERSIONS: For indoor
and outdoor installation
PART NO.: AST 14 C 255/00
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1st Edition, January 2013
ENGLISH

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2 AST 14 C 255/00
Contents
SECTION 01
TECHNICAL CHARACTERISTICS
1.1 – Models
1.2 – Overall Dimensions
1.3 – Technical Specifications ___________________Page 04
SECTION 02
TOUCH SCREEN CONTROL PANEL AND DIAGNOSTICS
2.1 – User's Interface
2.2 – LCD
2.3 – Boiler Status and Fault Codes ___________________Page 10
SECTION 03
HYDRAULIC DIAGRAMS AND COMPONENTS
3.1 – Hydraulic Diagrams
3.2 – Hydraulic Unit
3.3 – Expansion tank
3.4 – Heat exchangers
3.5 – Gas valve
3.6 – Flue gas fan ___________________Page 19
SECTION 04
GAS SETTING AND PARAMETERS
4.1 – Gas Valve Setting
4.2 – Flue Cleaning Function
4.3 – Gas Conversion
4.4 – Parameters ___________________Page 29
SECTION 05
OPERATING LOGIC
5.1 – Main General Characteristics ___________________Page 41
SECTION 06
ELECTRICAL SYSTEM
6.1 – Electronic Board
6.2 – Outer terminal box electrical connections
6.3 – Wiring Diagram ___________________Page 84
SECTION 07
VENT DUCTS AND PIPES
7.1 – 100/60 Co-axial Air/Vent Ducts
7.2 – 80/80 Split Air/Vent Ducts
___________________Page 87
TABLE OF TECHNICAL FAULTS
___________________Page 92

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4 AST 14 C 255/00
SECT. 1
TECHNICAL CHARACTERISTICS
1.1 MODELS
ITACA RTFS 24 - 28
ITACA CTFS 24 - 28 - 32
ITACA CTFS 24 - 28 - 32 for outdoor installation
ABBREVIATION KEY:
R: heating only
C: combi
TFS: forced draught
MAIN CHARACTERISTICS :
ITACA RTFS 24 - 28:
atmospheric boiler for indoor installation, heating only, sealed chamber, forced draught, mono-
thermal.
ITACA CTFS 24 - 28 - 32:
atmospheric boiler for indoor installation, combined instantaneous, with production of domestic hot
water + heating, sealed chamber, forced draught, mono-thermal with plate exchanger;
ITACA CTFS 24 - 28 - 32 for outdoor installation:
atmospheric boiler for indoor installation, combined instantaneous, with production of domestic hot
water + heating, sealed chamber, forced draught, mono-thermal with plate exchanger;
1.2 OVERALL DIMENSIONS
Height H = 750 mm
Width L = 420 mm
Depth D = 315 mm

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RTFS and CTFS VERSIONS
GGas inlet (1/2”)
MCH system flow (3/4”)
RCH system return (3/4”)
AF Cold water inlet (1/2”)
AC Domestic hot water outlet (1/2”) only for CTFS

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INSTALLATION TEMPLATE

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1.3 TECHNICAL SPECIFICATIONS
General Characteristics
RTFS CTFS
24 kW 28 kW 24 kW 28 kW 32 kW
Operating parameters
Equipment category II2H3+
Burner nozzles no. 11 13 11 13 15
CH circuit max. and min. pressure bar 3 - 0.5
DHW circuit max. and min. pressure (KC) bar - 6 - 0.5
DHW specific flow rate t 30°C l/min - 11.6 14.2 15.1
Double flow probe triggering temperature OFF °C 105
Double flow probe triggering temperature ON °C 90
Standard central heating setting range °C 35 ÷ 78
Standard max. operating temperature range °C 78 + 5
Reduced central heating setting range °C 35 ÷ 45
Reduced max. working temperature range °C 45 + 2
Plate DHW setting range °C - 35 ÷ 57
Plate maximum DHW operating temperature °C - 57 + 5
Boiler DHW setting range °C 35 ÷ 65 -
Nominal capacity of expansion tank l 7
Maximum recommended system capacity (**) l 150
Nominal electrical data
Power supply: Voltage/Frequency V / Hz 230-50
Power mains supply fuse A 2
Electric cabinet protection degree IP X5D
Max. absorbed power W 122 134 122 134 134
Electric power in standby condition W 2.3
Overall dimensions and connections
Height mm 750
Width mm 420
Depth mm 315
Gas connection - G ½
Flow and return connection - G ¾
Cold water and hot domestic water connection / boiler - G ½
Net weight Kg 26 33.5 28 35.5 35.5
Consumptions at maximum flow rate
Natural gas consumption (*) m3/h 2.72 2.70 2.72 2.70 3.23
Butane gas consumption kg/h 2.02 2.01 2.02 2.01 2.40
Propane gas consumption (LPG) kg/h 1.99 1.98 1.99 1.98 2.36
Operating characteristics
Type of ignition - Electronic
Flame surveillance - Ionisation
Type of detection - Non-polarised
(*) Value related to 15°C - 1013 mbar condition
(**) Maximum water temperature at 83°C, vessel preloaded at 1 bar.

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Design data and chimney sizing
RTFS - CTFS 24
Pmax. Pmin. Load at 30 %
Casing heat loss with burner off % 0.26 -
Casing heat loss with burner on % 1.05 0.63 -
Flue system heat loss with burner on % 5.97 10.37 -
Flue system mass capacity g/s 15.44 16.38 -
Flue gas temp. – air temp. °C 95 77 -
Residual head available Pa 105 105 -
CO2value % 6.6 2.9 -
Heat output efficiency rating (60/80°C) % 93.0 89.0 90.2
Heat output efficiency rating (30/50°C) % - - -
Efficiency rating
(according to 92/42/EC) - ★★★
Nox emission class - 2
RTFS - CTFS 28
Pmax. Pmin. Load at 30 %
Casing heat loss with burner off % 0.2 -
Casing heat loss with burner on % 0.76 1.01 -
Flue system heat loss with burner on % 5.54 10.09 -
Flue system mass capacity g/s 17.29 17.75 -
Flue gas temp. – air temp. °C 101 87 -
Residual head available Pa 70 70 -
CO2value % 7.1 2.9 -
Heat output efficiency rating (60/80°C) % 93.7 88.9 90.6
Heat output efficiency rating (30/50°C) % - - -
Efficiency rating
(according to 92/42/EC) - ★★★
Nox emission class - 2
CTFS 32
Pmax. Pmin. Load at 30 %
Casing heat loss with burner off % 0.2 -
Casing heat loss with burner on % 1.37 1.40 -
Flue system heat loss with burner on % 5.23 9.20 -
Flue system mass capacity g/s 17.8 19.7 -
Flue gas temp. – air temp. °C 105 73 -
Residual head available Pa 78 78 -
CO2value % 7.5 3.1 -
Heat output efficiency rating (60/80°C) % 93.4 89.4 91.0
Heat output efficiency rating (30/50°C) % - - -
Efficiency rating
(according to 92/42/EC) - ★★★
Nox emission class - 2

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Settings
RTFS - CTFS 24
Heat
output Heat Output MIN-MAX Supply pressure Nozzle Diameter Burner pressure MIN-MAX
(kW) (kW) (mbar) (mm) (mbar)
Natural gas
G20 25.5 11.1 – 23.7 20 1.35 3.2 – 12.2
butane gas
G30 25.5 11.1 – 23.7 29 0.78 7.5 – 28.3
propane gas
G31 25.5 11.1 – 23.7 37 0.78 7.6 – 34.2
RTFS - CTFS 28
Heat
output Heat Output MIN-MAX Supply pressure Nozzle Diameter Burner pressure MIN-MAX
(kW) (kW) (mbar) (mm) (mbar)
Natural gas
G20 30.5 12.0 – 28.6 20 1.35 2.7 – 12.4
butane gas
G30 30.5 12.0 – 28.6 29 0.78 6.0 – 29.3
propane gas
G31 30.5 12.0 – 28.6 37 0.78 8.1 – 36.3
CTFS 32
Heat
output Heat Output MIN-MAX Supply pressure Nozzle Diameter Burner pressure MIN-MAX
(kW) (kW) (mbar) (mm) (mbar)
Natural gas
G20 33.0 14.3 – 30.8 20 1.35 2.84 – 11.11
butane gas
G30 33.0 14.3 – 30.8 29 0.77 7.1 – 28.7
propane gas
G31 33.0 14.3 – 30.8 37 0.77 9.5 – 35.3

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SECT. 2
TOUCH SCREEN CONTROL PANEL AND DIAGNOSTICS
2.1 USER'S INTERFACE
The interface features a capacitive keyboard to access the setting by simply touching the
keys on the interface key-area. This is the only way to enable back-lighting (keys + LCD)
and access the various functions. Only "active" keys will be backlit, thus guiding the user
to proper use.
One minute after the last key has been touched, interface is disabled and back-lighting is
turned off.
NB: back-lighting has different operating modes which can be enabled by means of
parameter P78 (default 0), depending on the needs:

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0= standard, 1= LCD always on 2= LCD + keys always on
1. Temperature selection or recall information
This key enables switching from “day” to “night” temperature (and reverse) during the automatic
programming of heating times. When not programming, this key enables to scroll in sequence the parameter
values for displaying purposes only.
2. Programming key
During standard operation, it is possible to switch from manual to automatic programming and reverse by
pressing this key (then pressing “OK” key to confirm). By repeatedly pressing in sequence, it will be possible
to display and edit the desired program: zone 1, zone 2 or boiler (only for the RTFS version).
3. Time and ambient temperature setting key
This key enables the setting of time (hour and minutes), day of the week, ambient “day” and “night” operating
temperatures for the automatic programming mode (each value must be confirmed with the “OK” key).
Warning: in case temperature probes are used for ambient management, “day” temperature represents the
desired ambient temperature.
4. LCD Display
The LCD shows the boiler status and operation information (see following paragraph).
5. Domestic hot water temperature setting key
These keys are used to set (increase or decrease) the domestic hot water temperature from a minimum
value of 35°C to a maximum value of 57° or 65°C, depending on boiler type (instantaneous type or with
water heater respectively).
6. Boiler reset key
This key enables to resume boiler operation after a shut-down (only for resettable faults), or to return to the
main page during the parameter selection.
7. COMFORT and parameter confirmation key
This key is used to enable and disable the COMFORT function in order to maintain the pre-heated plate
exchanger at a specific temperature (CTFS version) or to enable heating of water heater outside the set
programming (RTFS version with water heater).
Besides, this key is used to confirm the new settings while editing.
8. Boiler status selection key
Press this key to set the following functions:
SUMMER : Boiler produces domestic hot water only.
WINTER : Boiler provides both central heating and domestic hot water.
CENTRAL HEATING ONLY : Boiler provides central heating only
STAND-BY OFF: Boiler in standby mode: central heating and DHW functions are disabled.
9. Central heating water temperature setting key
Without external probe, this key is used to set the water temperature value of the heating system between a
minimum value of 35°C and a maximum value of 45°C (reduced range) or 78°C (standard range). With
external probe, instead, it is used to set the fictitious temperature (see paragraph about thermoregulation).

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2.2 LCD
Symbol Description
Day of the week indicator
During boiler standard operation, the icon steady on indicates the current day
of the week; during the automatic programming, it indicates the day(s) in
which the time slots are modified.
The flashing icon indicates the programming of the day of the week during
the setting phase.
Manual operation indicator
It shows that the boiler operation in heating mode is active 24 h a day. The
zones are switched on and off only as a result of the signals from the ambient
thermostats, or according to the "day" temperature in case ambient probes
are used.
Instead, the boiler programming (RTFS) is maintained.
Zone 1 heating programme indicator
During standard operation, the icon steady on indicates that zone 1 heating
programme is active. It will light in a steady way also while displaying the
relevant programme, and will flash during programming.
Zone 2 heating programme indicator
During standard operation, the icon steady on indicates that zone 2 heating
programme is active. It remains on steady also while displaying the relevant
programme, and it will flash during programming.
Boiler programme indicator
During standard operation, the icon steady on indicates that the boiler
programme is active. It remains on steady also while displaying the relevant
programme, and it will flash during programming.

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Programming indicator
It is displayed only in the automatic programming mode, indicating the
possibility to edit the time slot of both the CH circuit and of the boiler.
First alphanumeric indicator
Alphanumeric values indicating the current time during standard operation, or
the specific time during automatic programming of both the CH circuit and of
the boiler.
It indicates the fan speed (in rpm) during the “flue cleaning" function.
Flue cleaning function indicator
It flashes when the flue cleaning function is started (by pressing the reset key
for three seconds) and then remains steady on once the function is active.
During such function, the fan rpm is displayed by the first alphanumeric
indicator, while the flow temperature is displayed by the second indicator.
Temperature indicator
Respectively: sun=day or comfort, moon=night or reduced temperature.
When the automatic programming operation is active, the single indicators
are lit in a steady way to indicate the current temperature.
They will flash during the setting of the relevant temperatures.
Daytime temperature indicator
Daytime temperature time slot (sun) during the programmed operation.
Night-time temperature indicator
Night-time temperature time slot (moon) during the programmed operation.
COMFORT function indicator
Icon on, steady = function enabled;
Icon off = function disabled.
Boiler status indicator
Icons indicate the operating modes enabled:
- instantaneous DHW;
- heating.
DHW indicator
It turns on while the boiler is fulfilling a DHW request.
It flashes when setting the DHW temperature with the key 5 (see previous
paragraph).
Central heating indicator
It turns on while the boiler is fulfilling a CH request.
It flashes when setting the CH water temperature with the key 9 (see previous
paragraph).
Fictitious ambient temperature indicator
In case an external probe is installed, this indicator flashes when the fictitious
ambient temperature is set with the key 9 (see previous paragraph).
Second alphanumeric indicator
This shows the following:
- flow water temperature during “heating” function;
- central heating water temperature setting;
- domestic hot water temperature during the “DHW” function;
- domestic hot water temperature setting;
- parameter value display
- boiler diagnosis.
Centigrade degree indicator
When displayed simultaneously with the second alphanumeric indicator, it
shows the value expressed in centigrade degrees.

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Solar indicator
It turns on when the solar function of pump or solar valve activation
(depending on the system to be managed) is performed.
Automatic filling and SUPER-TECHNICAL parameter indicator
It indicates that automatic filling is in progress after a pressure drop in the
system.
When displayed simultaneously with the parameter display indicator, it shows
that the "super-technical parameter" programming mode has been reached.
An access code is needed to access the display or editing mode.
Installation parameter indicator
When displayed simultaneously with the parameter display indicator, it shows
that the "parameter programming" mode has been entered.
Parameter display indicator
Depending on the operating status, it indicates the parameter or the system
pressure or the burner output rate percentage, expressed in numeric value.
Pressure indicator
When displayed simultaneously with the parameter display indicator, it shows
the system pressure only with the boiler waiting for a request.
Percentage indicator
When displayed simultaneously with the parameter display indicator, it shows
the output rate percentage at which the boiler is operating following a
request.
Flame lighting indicator
It turns on upon detecting burner flame lighting.
Parameter editing indicator
During the programming of any parameter, it shows the possibility to edit the
associated parameter value.
2.3 BOILER STATUS AND FAULT CODES
Normal operation
Boiler in STANDBY mode with forced heating circuit in manual mode.
System pressure and current time are displayed.

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Boiler in SUMMER or WINTER mode with forced heating circuit in
automatic mode.
No active function.
Flow water temperature, system pressure and current day and time
are displayed.
Boiler in SUMMER or WINTER mode with forced heating circuit in
manual mode and “comfort” function enabled.
DHW function active with flame lit.
Hot domestic water temperature, burner output rate percentage and
current time are displayed.
Boiler in ONLY WINTER mode with forced heating circuit in automatic
mode and “solar” function enabled.
CH function active with flame lit.
Flow water temperature, burner output rate percentage and current
day and time are displayed.

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Malfunction, errors to be reset by user and self-resettable faults
The display indicates the fault through the relevant error code (see following table). Some
faults can be reset by pressing the "reset" key (r), some others are self-resettable (a) and
reset only when the fault is resolved:
Boiler shut-down due to missing flame (r)
Boiler shut-down due to double flow probe triggering (r)
Boiler shut-down due to air pressure switch triggering (r)
Boiler shut-down due to too low system pressure (a)
Boiler shut-down due to double flow probe fault (a)
Warning: in case of self-resettable faults, only
back-lighting of the LCD will remain active while
the relevant error code will flash. In case of
resettable faults, instead, the error is displayed
in a steady way, and the "reset" key is enabled
as well to reset boiler shut-down condition.
In either case, once the fault has been resolved,
back-lighting of all keys is enabled and after
one minute (no other key being pressed) the
interface is disabled.

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Boiler shut-down due to DHW probe fault (only for CTFS version)
(a)
Automatic filling failed (only for CTFS version)
System pressure too high
Boiler shut-down due to boiler probe fault (RTFS combined with
boiler)or DHW inlet probe (CTFS) (a)
External probe fault (a)
Solar collector probe fault (SCS) (a)
Solar valve probe fault (SVS) (a)
Solar water heating probe fault (SBS) (a)
Remote control connection fault (signalled only by remote control)
(a)
Triggering of safety thermostat in mixed zone 2 (a)
Mixed zone 2 flow probe fault (a)
Mixed zone 3 flow probe fault (a)
Mixed zone 4 flow probe fault (a)
Communication failure between peripheral devices: interface or
supplementary board (a)
Hydraulic configuration not allowed
Zone configuration error (remote, thermostat and ambient probes)

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Ambient probe 1 (a) fault
Ambient probe 2 (a) fault
Pressure transducer fault (a)
Communication error between main board and interface board
Shut-down due to safety circuit hardware fault
Air pressure switch recognition failure
Incompatibility between boiler board and interface board
Modulation coil fault (a)
Max. number of reset attempts from interface reached (r)
Max. number of reset attempts reached (signalled both by remote
control and interface)(r)
NB: The board is able to count and store the boiler's latest five faults (both resettable and self-
resettable). View them by scrolling super-technical parameters from P01 to P05.

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SECT. 3
HYDRAULIC DIAGRAMS AND COMPONENTS
3.1 HYDRAULIC DIAGRAMS
RTFS
1. Automatic by-pass 10. Pressure measurement point on flue gas duct
2. Modulation gas valve 11. Air intake and venting duct
3. Burner 12. Pressure measurement point on flue gas duct
4. Double flow probe 13. Expansion tank
5. Ignition/detection electrode 14. 3-bar safety valve
6. Mono-thermal exchanger 15. Deaerator
7. Sealed combustion chamber 16. Pressure transducer
8. Flue gas extractor fan 17. 3-speed circulation pump
9. Flue gas circuit safety pressure switch
MCH system flow FCold water inlet
GGas inlet RCH system return

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CTFS
1. Automatic by-pass 14. Pressure measurement point on flue gas duct
2. Domestic hot water temperature sensor 15. Expansion tank
3. Motorised 3-way valve 16. Cold water temperature sensor
4. Modulation gas valve 17. 3-bar safety valve
5. Burner 18. Deaerator
6. Double flow probe 19. Pressure transducer
7. Ignition/detection electrode 20. 3-speed circulation pump
8. Mono-thermal exchanger 21. Automatic filling solenoid valve
9. Sealed combustion chamber 22. Flow rate limiting device
10. Flue gas extractor fan 23. Filler cock
11. Flue gas circuit safety pressure switch 24. Cold water flowmeter with filter
12. Pressure measurement point on flue gas duct25. Insulated secondary plate exchanger
13. Air intake and venting duct
MCH system flow CDomestic hot water outlet
GGas inlet FCold water inlet
RCH system return