Fondital ITACA RTFS 24 Manual
  1. Manuals
  2. Brands
  3. Fondital Manuals
  4. Boiler
  5. ITACA RTFS 24
  6. Manual

Fondital ITACA RTFS 24 Manual

Wall-hung
Hide thumbs Also See for ITACA RTFS 24:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Installation, Use and Maintenance Manual
DIDACTIC MANUAL
FAMILY:
Wall-hung boilers
Instantaneous type and
GROUP:
forced draught heating
only
MODELS:
Itaca
For indoor
VERSIONS:
and outdoor installation
PART NO.:
AST 14 C 255/00
______________________________________________
1st Edition, January 2013

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the ITACA RTFS 24 and is the answer not in the manual?

Questions and answers

Related Manuals for Fondital ITACA RTFS 24

Summary of Contents for Fondital ITACA RTFS 24

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

  • Page 2: Table Of Contents

    Contents SECTION 01 TECHNICAL CHARACTERISTICS 1.1 – Models 1.2 – Overall Dimensions 1.3 – Technical Specifications ___________________Page SECTION 02 TOUCH SCREEN CONTROL PANEL AND DIAGNOSTICS 2.1 – User's Interface 2.2 – LCD 2.3 – Boiler Status and Fault Codes ___________________Page SECTION 03 HYDRAULIC DIAGRAMS AND COMPONENTS 3.1 –...
  • Page 3 ________________________________________________________________________________ AST 14 C 255/00...

  • Page 4: Models

    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 heating only combi TFS: forced draught MAIN CHARACTERISTICS  ITACA RTFS 24 - 28: atmospheric boiler for indoor installation, heating only, sealed chamber, forced draught, mono- thermal.
  • Page 5 RTFS and CTFS VERSIONS Gas inlet (1/2”) CH system flow (3/4”) CH system return (3/4”) Cold water inlet (1/2”) Domestic hot water outlet (1/2”) only for CTFS ________________________________________________________________________________ AST 14 C 255/00...
  • Page 6 INSTALLATION TEMPLATE ________________________________________________________________________________ AST 14 C 255/00...

  • Page 7: Technical Specifications

    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 CH circuit max. and min. pressure 3 - 0.5 DHW circuit max. and min. pressure (KC) 6 - 0.5 DHW specific flow rate ∆t 30°C l/min...
  • Page 8 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 15.44 16.38 Flue gas temp.
  • Page 9 Settings RTFS - CTFS 24 Heat Heat Output Supply Nozzle Burner pressure output MIN-MAX pressure Diameter MIN-MAX (kW) (kW) (mbar) (mm) (mbar) Natural gas 25.5 11.1 – 23.7 1.35 3.2 – 12.2 butane gas 25.5 11.1 – 23.7 0.78 7.5 – 28.3 propane gas 25.5 11.1 –...

  • Page 10: User's Interface

    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.
  • Page 11 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.

  • Page 12: Lcd

    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.
  • Page 13 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.

  • Page 14: Boiler Status And Fault Codes

    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.
  • Page 15 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.
  • Page 16 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: Warning: in case of self-resettable faults, only back-lighting of the LCD will remain active while...
  • Page 17 Boiler shut-down due to DHW probe fault ( only for CTFS version Automatic filling failed (only for CTFS version) System pressure too high Boiler shut-down due to boiler probe fault ( RTFS combined with ) or DHW inlet probe (CTFS) boiler External probe fault Solar collector probe fault (SCS)
  • Page 18 Ambient probe (a) fault Ambient probe (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.

  • Page 19: Hydraulic Diagrams

    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.
  • Page 20 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.

  • Page 21: Hydraulic Unit

    3.2 HYDRAULIC UNIT MOTORISED THREE-WAY VALVE (only for CTFS version) The boiler uses a three-way valve to divert the water flow coming from the primary exchanger into another pipe, in particular it diverts the water into the secondary (plate) exchanger, where heat will be transferred to the DHW. This valve consists of one main brass three-way body, one plastic (thermosetting polymers) cartridge, and one electric motor (actuator) to move the internal shutter.
  • Page 22 Three-way valve section: CARTRIDGE IN THERMOSETTING POLYMERS SHUTTER ACTUATOR 3-WAY STATUS Domestic hot water Shutter upwards Actuator piston in rest position Central heating Shutter downwards A t t The boiler is fitted with an internal automatic by-pass with non-return valve, whose opening threshold is 400 mBar.
  • Page 23 The circulation pump end block features one 3-position selector to set the motor rotation speed and thus the head to the system. The circulating pump is the same for all output rates, what varies (depending on the hydraulic circuit of the boiler) is the residual head curve: RTFS 24 kW RTFS 28 kW...
  • Page 24 CTFS 28 – 32 kW V1 Pump speed I (min) V2 Pump speed II V3 Pump speed III (max) DHW FLOWMETER (only for CTFS version) The DHW flowmeter is fitted with an internal turbine for metering the volume while DHW is being drawn. Besides determining the minimum quantity of DHW needed to start the boiler , it calculates the...

  • Page 25: Expansion Tank

    AUTOMATIC FILLING SOLENOID VALVE (only for CTFS version) Besides the standard filler cock, the boiler features an automatic filling valve, directly controlled by the boiler electronic board. A specific parameter (P94) can be used to enable the solenoid valve and to change the operating logic values (refer to paragraph “Automatic filling function”...

  • Page 26: Heat Exchangers

    3.4 HEAT EXCHANGERS PRIMARY EXCHANGER It is made up of a set of copper pipes, connected to each other in a way to create a "coil". The finning improves the efficiency of the heat exchange between the water flowing inside, the head developed by the burner flame and the hot combustion flue gases.

  • Page 27: Gas Valve

    3.5 GAS VALVE The boiler is approved for operating with gas valve, model SIT 845: Gas inlet pressure ELECTRICAL CONNECTIONS SOLENOID VALVES SV1 and SV2 measurement point GAS IN Gas outlet pressure measurement GAS OUT point Gas valve characteristics EV1 and EV2 safety coil operating power supply 230 VAC 50 Hz EV1 operating current 40 mA...

  • Page 28: Flue Gas Fan

    3.6 FLUE GAS FAN Flue gas fan is of asynchronous type (fixed speed) and is used to purge flue gases generated by combustion during boiler operation. The fan features a Pitot plastic pipe to limit the condensate build up on the fan pressure measurement point to which a control device (air pressure switch) is connected to ensure correct ventilation.

  • Page 29: Gas Valve Setting

    SECT. 4 GAS SETTING AND PARAMETERS 4.1 GAS VALVE SETTING To set the gas valve, proceed as follows:  check supply static pressure by means of the inlet pressure measurement point E referring to the "setting" table on page 9, according to the type of fuel used (pressure values lower than requested do not guarantee proper boiler operation);...

  • Page 30: Flue Cleaning Function

    4.2 FLUE CLEANING FUNCTION The boiler features a flue cleaning function which must be used to measure combustion efficiency during operation and to set the burner. This function can be enabled only in the HEATING + DOMESTIC HOT WATER operating mode.

  • Page 31: Gas Conversion

    The current supplied to the modulation coil at the minimum and at the maximum output values according to the gas used are given below: [mA] [mA] Natural Release the “+” or “- DHW” keys to return to the previous page showing the current at the modulation coil and the flow temperature.

  • Page 32: Parameters

    4.4 PARAMETERS The boards feature a memory with a series of parameters that can be accessed for displaying purposes only. They can as well be edited for boiler perfect configuration depending on the system used. These parameters can be directly accessed from user's interface, or through the remote control.
  • Page 33 SUPER-TECHNICAL parameter editing (press “reset” and To access the super-technical parameter programming, proceed as described in the previous paragraph “boiler status” keys simultaneously for three seconds). Super-technical parameters are in sequence after the 90th parameter. The message “Cod” shows that a code must be entered (default 1398) with the “+ and – heating”...
  • Page 34 Parameter display (read-only) Press the “info” key several times to scroll in sequence the values of the parameters for displaying purposes only (from P30 to P50), such as the temperatures detected by the connected probes. To quit the displaying function, simply press “reset”. The start page will be displayed anyway 60 seconds after the last time the key has been pressed.
  • Page 35 0 = solar valve 0 ÷ 1 Solar plant selection 1 = solar pump (with P17=2P3=1) 10 to 90 °C 60 °C Water heater set-point setting range 1 to 30 °C 6 °C ∆T ON (d iff. for solar pump switch-on) Only with forced 1 to 30 °C 3 °C...
  • Page 36 It can be displayed with Display of current flow temperature three connected zone boards for zone 4 Display of plate DHW temperature RTFS = temp. boiler CTFS = temp. Cold water Display of boiler temperature inlet Visible only with connected solar collector Display of solar collector temperature probe Visible only with...
  • Page 37 0 = flow temperature 1 = amb. probe temp. 1 2 = amb. probe temp. 2 3 = external temperature Type of temperature visualisation on 0 ÷ 7 = water heater temp. display 5 = solar collector temp. 6 = solar valve temp. 7 = solar valve temp.
  • Page 38 opening time Useful to balance thermal Rise in nominal boiler temperature with 0 ÷ 35 °C 5 °C shocks at the circuit breaker zone board 0 = disabled 0 ÷ 1 1 = enabled Thermal discharge enabling with solar card 0 = standard (off) 0 ÷...
  • Page 39 SUPER-TECHNICAL parameter list (code 1398) Default Parameter Range Notes values X = P0 technical parameters Y = P2 technical Display of boiler type parameters Z = P18 technical parameters Fault code Boiler last shut-down displaying Boiler second last shut-down Fault code displaying Fault code Boiler third last shut-down displaying...
  • Page 40 Post-circulation time at the end of 0 ÷ 180 sec 30 sec maintenance cycle Flame propagation time on TFS boiler with 0 to 4 s ramp enabled 0 = flow switch 1 = flowmeter 0 ÷ 2 2 = automatic: mid- DHW water flow measurement interface, flow switch, top interface: flowmeter...

  • Page 41: Main General Characteristics

    SECT. 5 OPERATING LOGIC 5.1 MAIN GENERAL CHARACTERISTICS  Function priority;  Boiler type selection;  Automatic flame control;  Ignition with ramp or at pre-set output;  DHW control;  Plate DHW modulation;  Boiler DHW modulation;  DHW COMFORT function; ...
  • Page 42 BOILER TYPE SELECTION Boiler type configuration; This board is preset to manage 3 different types of boiler configurations, depending on the setting of parameter P3: P3 = 1  combi instant plates (model CTFS) P3 = 2  heating only (model RTFS) P3 = 3 ...
  • Page 43 CTFS Configuration (forced draught) The type of boiler (sealed chamber or open chamber) is automatically recognised each time the board is supplied with power. The board attempts to read the inlets dedicated to the air pressure switch. During such phase, “CHA” will appear on the boiler display and upon the following recognition (which must take place within the first two minutes) C (sealed chamber) will be displayed for 5 seconds.
  • Page 44 AUTOMATIC FLAME CONTROL The device is always enabled and constantly performs self-check functions. Upon an operation request, the fan is supplied with power after checking that the air pressure switch (C type) is in rest condition. As soon as the air pressure switch enabling is output, the flame control device starts measuring the waiting time TW (1.5 seconds);...
  • Page 45 IGNITION WITH RAMP OR AT PRE-SET POWER Boiler ignition mode is selected with parameter P6 (default setting is 0): P6=0  Ignition with ramp Upon every operation request entailing burner ignition, burner will be ignited with a current ramp to modulation coil changing from the initial to the final value within 10 seconds.
  • Page 46 DHW CONTROL With boiler running in “DHW” or “DHW + CH” mode, a flow rate exceeding 2.5 litres/minute within the flowmeter (CTFS version) or boiler programme enabling (RTFS version with water heater), generates a DHW operation request, thus starting "DHW modulation". The operation request in DHW mode has the priority over all other requests, and finishes when the previously mentioned electric contacts are opened again.
  • Page 47 During DHW modulation, once the min. gas flow rate is reached and with the supplied output above the required one, the burner is switched off when DHW temperature reaches the + 5°C set-point value. After burner switching off, whilst the operation request is still present, burner will be ignited again when the temperature falls below the + 3°C set-point.
  • Page 48 During boiler heating phase: with P28 = 0 (pump and deviating valve), the boiler pump is supplied with power whereas the deviating valve is in DHW position; with P28 = 1 (heating pump and DHW pump), the heating pump is off whereas the DHW pump is supplied with power;...
  • Page 49 CH CONTROL The boiler electronics features a "timer" function for the weekly programming of heating times (automatic operation). This function can be used to manage separately up to two zones and the relevant signals are connected to the boiler board, which features two inputs for the connection of the standard ambient thermostats and one remote control.
  • Page 50 ADJUSTABLE HEATING MAXIMUM OUTPUT During operation in heating mode, the maximum output supplied to the burner is equal to the one set by parameter P7. This parameter represents the percentage (default 100%) of maximum admissible current supplied to the modulation coil (120 mA for natural gas and 170 mA for LPG). CH WITHOUT AMBIENT PROBES (P57=4) With the boiler set on the "DHW + CH"...
  • Page 51 In case of probes not correctly set or installed in an improper position, the ambient probe reading can be corrected with the parameters P53 (for SA1) and P56 (for SA2). Ambient probe value is the result of the value read by ambient probe plus or minus the value of the two parameters given above (from -5°C to +5°C).
  • Page 52 Zone 2 works at sliding temperature, calculating the set-point as a function of the external temperature, of the set curve and of the "Fictitious ambient temperature" set with “+/- heating” key, according to the specific programme. Instead, the set-point requested by the probe (zone1) is calculated as a function of the external temperature, of the ambient temperature, of the set curve, of the constant "K"...
  • Page 53 The "sun" symbol (with indication of the lit bars) indicates that heating is enabled; whereas the "moon" symbol (bars off) indicates disabling periods. The hour programming is logically in series with the ambient thermostat inputs. This means that the boiler will perform heating only if the TA contact is closed and if the programming is in the enabled periods (sun).
  • Page 54 HEATING MODULATION Upon an operation request in heating mode by thermostat or ambient probe or remote control, burner ignition sequence is started with the automatic flame control section enabling, if the water temperature read by the flow NTC probe is lower than the set temperature value.
  • Page 55 with P17 = 1 (multifunction relay in remote relay/TA1), the relay is energised in response to a request from the remote control or from TA1 and returns to the rest condition upon a DHW request or in case the boiler is switched OFF or to DHW ONLY mode;...
  • Page 56 With P57=3 flow set-point value is calculated (ambient probe and external probe modulation) according to the external probe and to the selected curve (as with P57=2), plus the following value: ∆Tflow = Curve*K*∆Tambient where, ∆Tflow = value to be added to the calculation of flow with external probe; Curve = curve set value (P10) K = constant indicating ambient probe weight given by parameter P58 (default 8) ∆Tambient = difference between set temperature and temperature read by the ambient...
  • Page 57 The board independently detects the presence of the external temperature probe and enables the thermoregulation function, by keeping the flow temperature within the heating temperature pre-selection range (35 °C ÷ 78 °C or 35 °C ÷ 45 °C). If both the external probe and the remote control are present, assuming that the remote control is able to set and carry out its own thermoregulation, the modulation board transmits the external temperature value to the remote control, and if the heating request is determined by the same control, this will determine the flow temperature according to its...
  • Page 58 The curves given in the above diagram refer to a request of a “fictitious ambient temperature” of 20°C. In case of different fictitious temperature, all curves are shifted in a parallel translation: Example of curve shifting with P10=1.5 and ambient fictitious temperature from 20 to 25°C.
  • Page 59 Checking the thermoregulation curve setting It takes time to choose the best curve. Consider the following suggestions:  if upon external temperature decrease the room temperature increases, it is necessary to set a curve with a lower slope, i.e. a lower curve; ...
  • Page 60 PROGRAMMABLE MULTIFUNCTION RELAY The boiler is fitted with a multifunction relay (230 Vac, 10A cos1) which can be associated to a different function by setting parameter P17:  P17=0 Alarm reference Upon each shut-down or fault the relay is energised: Electrical connections: 21 22 23 21 22 23...
  • Page 61  P17=2 Solar plant reference: BOILER INTEGRATION (P18=0) only for CTFS Management of a solar plant deviating valve (VM): Electrical connections: 21 22 23 21 22 23 The function consists in properly controlling the motorised valve VM by means of the multifunction relay and in activating the boiler burner only if the solar water heater temperature is sufficient to fulfil the request for...
  • Page 62  P17=2 Solar plant reference WATER HEATER FILLING (P18=1) Management of a forced-type solar plant pump (PS): Electrical connections: 21 22 23 The function consists in controlling, on specific conditions, the solar pump through the multifunction relay to heat a water heater. This is achieved by controlling two probes located respectively on the solar collector (SCS) and at the bottom of the solar water heater (SBS).
  • Page 63 Water heater filling condition (pump OFF): Solar pump PS is disabled in the following conditions:  Tsbs > P19  Tscs – Tsbs < ∆T OFF (P21)  Tscs < Tmin solar collector OFF (P23 - 5°C)  Tscs > Tmax solar collector OFF (P22) Where Tsbs is the temperature detected by the solar water heater probe and Tscs is the temperature detected by the solar collector probe.
  • Page 64 Tsbs < P19 Tscs > Tsbs - ∆T OFF (P21) If solar water heater temperature probe (SBS) is faulty, the function is not performed. WARNING: the water heater cooling function is normally disabled. Set parameter P26 to 1 to enable it. Besides it is enabled only if either the “DHW ONLY”, or the “DHW + CH”...
  • Page 65 RS 485 Connection and setting Regardless of the number of boards used, each of them must be connected to the boiler board in a cascade-type connection through a RS485 connection as shown in the image on the side: BOILER    BOARD ...
  • Page 66 Wiring diagrams The heating zones 1 and 2 can be controlled by remote control (TA1) or ambient thermostat (TA2) that can be connected to the boiler boards, whereas zones 3 and 4 are activated by the ambient thermostat directly connected to the relevant zone board. Zones 3 and 4 can not manage the safety thermostat on flow line (TSM) which therefore is to be connected in series to the pump power supply and cannot be signalled as a fault.
  • Page 67 The zone board is further supplied with a bi-colour LED with the following indications: Green steady  pump enabled Red quick flashing  valve opening; Red slow flashing  valve closing; Green flashing  boards with no request; Red flashing slow-slow (1s on, 1s off)  faulty communication with boiler board;...
  • Page 68 (without external probe) according to the selected range. Parameter P39 displays the calculated flow temperature, whereas parameter P40 the current one detected by the boiler probe. NB: with heat requests from different zones at the same time, the boiler flow set-point corresponds to the highest of the calculated values.
  • Page 69 Water heater filling function (pump ON) Boiler temperature is set with parameter P19, which corresponds to a value ranging from 10 to 90°C ( default 60°C Solar pump PS is enabled in the following conditions:  Tsvs < P19 - 2°C ...
  • Page 70 Collector heat transfer function This function prevents solar collectors from remaining in a stagnation state for a long time, which would expose them to high risk of thermal stress, when solar water heater temperature is reached. For this reason solar pump PS is reactivated according to the following logic: Tscs >...
  • Page 71 CONFIGURATION 2: suitable for boilers with integrated water heater (P3=3), where the "complex" solar plant to be managed is designed for heating the solar storage in a forced circulation system through the pump PS with the option of transferring the excess solar energy to a secondary item through the deviating valve VM.
  • Page 72 Water heater filling function (pump OFF) Solar pump PS is disabled in the following conditions:  Tsbc > P19  Tscs – Tsbs < ∆T OFF (P21)  Tscs < Tmin solar collector OFF (P23 - 5°C)  Tscs > Tmax solar collector OFF (P22) Warning: in case of boiler water heater probe SBC fault, the water heater filling is managed according to the same logic, taking into account the solar water heating probe SBS instead of the faulty one.
  • Page 73 Tsbc > 95°C The solar pump PS (with the VM in “heat discharge” mode) is now supplied with power when: Tscs > Tsvs The function stops when the PS is switched off at the following conditions: Tscs < (P22 -12°C) Tscs >...
  • Page 74 Logical diagram of heat transfer / heat discharge operation HEAT TRANSFER / HEAT DISCHARGE (P22-10°C) < SCS < P22 Psol = OFF SBC > 95°C VM in water heater position HEAT TRANSFER P76 = 1 VM in water HEAT DISCHARGE heater position VM in heat Psol = ON...
  • Page 75 Solar functions characteristics Each time the solar pump becomes operational, its active state will be signalled by the icon on the boiler display. In case of fault of the solar water heating probe (SBS) or of the solar collector probe (SCS), the solar pump is immediately switched off and the fault is reported through the boiler board interface and the remote control (if connected) with the relevant error codes (E28 and E24 respectively).
  • Page 76  Plate DHW probe (E06): fault: with a request in DHW mode, the burner is not activated (if it was ON it is switched OFF) and the pump is activated as long as the request persists. At the end of the request, if no other requests are present, the system performs a 30-second post-circulation cycle.
  • Page 77  External probe fault (E23): each operation request in heating mode entailing the burner ignition is carried out ignoring the calculation algorithm: the curve value is used to determine the operation range (standard or reduced) with set-point corresponding to the set one. Correct operating range: from -40 to +50°C, general tolerance: +/- 3°C ...
  • Page 78 PUMP POST-CIRCULATION FUNCTION At the end of a heating, anti-freeze or flue cleaning request, the burner (if ON) is immediately switched off, whereas the pump continues to be supplied with power for 30 seconds (time that can be set by means of parameter P13). The same applies to the multifunction relay with P17=1 or P17=3 at the end of each request by the remote control or the associated ambient thermostat.
  • Page 79 Plate DHW (only combined instantaneous) The DHW NTC probe measures the DHW temperature and if it falls below 5°C it generates an operation request in DHW anti-freeze mode. The pump is activated and after a 30 sec waiting time, the burner ignites with output forced to the minimum value. During a DHW anti-freeze operation the temperature detected by the flow probe is constantly checked, and in case it reaches 60°C the burner is switched off.
  • Page 80 AUTOMATIC FILLING FUNCTION Automatic filling is enabled only if parameter P94 is set to 1. When the function is disabled, only the system pressure is controlled (with proper signalling in case the pressure is too low), whereas, when it is enabled, the filling will be carried out according to the following values given in the super-technical parameters: DEFAULT SUPER-TECHNICAL PARAMETER...
  • Page 81 ANTI-LEGIONELLA FUNCTION (only for RTFS with water heater) The anti-legionella function is available in the boiler-version systems (P3=3) and is always enabled. This function is enabled whenever a time interval of 15 days elapses. Once such this time interval has run out, a boiler heating phase, having a fixed set-point of 65 °C and a maximum duration of 30 minutes, is started.
  • Page 82 Air pressure switch (E03 shut-down for CTFS version) The air pressure switch, fitted only in the forced draught models, is a normally open contact connected in series with the gas valve, and is directly managed by the automatic flame control. Its function is to detect a proper pressure difference in two different points of the boiler and is directly managed by the electronic board.
  • Page 83 FORCED DRAUGHT = If for any reason the board is not able to detect the presence of the air pressure switch, the E72 fault will be signalled. To reset this shut-down status, power off and back on to start a new self-recognition cycle.

  • Page 84: Electronic Board

    SECT. 6 ELECTRICAL SYSTEM 6.1 ELECTRONIC BOARD Boiler is managed by means of two electronic boards, a main board and an interface board. The former is the boiler hardware in which also the ignition transformer is integrated. The latter enables the user to control the boiler through a touch screen interface and an LCD display.

  • Page 85: Outer Terminal Box Electrical Connections

    WARNING: removing the plastic front part of the interface board is not allowed (spare part is supplied pre-assembled). 6.2 OUTER TERMINAL BOX ELECTRICAL CONNECTIONS All the electrical connections are ensured through the terminal box located on the back side of the electric panel. The supplementary boards (used to manage the zones or complex solar plants) are housed outside, on the panel back side.

  • Page 86: Wiring Diagram

    6.3 WIRING DIAGRAM Key: pressure transducer ignition and detection electrode flowmeter MVD: motorised deviating valve DHW probe OUT, NTC 10K Ohm gas valve S3S: DHW probe IN, NTC 10K Ohm boiler modulation circulation pump APS: pressure switch SR1 SR2: double flow probe NTC 10K Ohm automatic filling valve ________________________________________________________________________________ AST 14 C 255/00...

  • Page 87: 100/60 Co-Axial Air/Vent Ducts

    SECT. 7 VENT DUCTS AND PIPES For intake/flue gas vent lines use only original ducts designed for the specific boiler (as per manufacturer's specifications). 7.1 100/60 CO-AXIAL AIR/VENT DUCTS Dimensions for connection of flue gas duct to co-axial pipes Type C12 Type C12 horizontal vent The minimum permissible length of horizontal coaxial pipes is 0.5 metres, including the first elbow connected to the boiler.
  • Page 88 Type C32 vertical vent Minimum permissible length for vertical coaxial pipes is 1 metre, equal to the length of the chimney. The maximum permissible length of horizontal coaxial pipes is 6 metres for 24 kW models, 7 metres for 28 kW models and 5 metres for 32 kW models, including the chimney. For each additional 90°...

  • Page 89: 80/80 Split Air/Vent Ducts

    7.2 80/80 SPLIT AIR/VENT DUCTS Type C12 - C32 - C42 – C52 – C82 24 kW flue gas vent diaphragms: Diaphragm diameter Pipe length [m] flue gas vent [mm] 1 ≤ L < 3 39.8 3 ≤ L < 14 14 ≤...
  • Page 90 80/80 split duct load loss table Part Vent Intake 24 kW 28 kW 32 kW 24 kW 28 kW 32 kW 1m extension 0.5m extension 90° elbow 90° elbow - narrow radius 45° elbow Elbow with flue gas measurement point Wall vent terminal Roof vent terminal Vertical stub pipe...
  • Page 91 NOTES __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ __________________________________________________ ________________________________________________________________________________ AST 14 C 255/00...
  • Page 92 TABLE OF TECHNICAL FAULTS Boiler Status Malfunction Probable cause Solution Check gas pressure. Check gas supply cock or gas Gas supply fault network safety valve Burner does not intervention. ignite Gas valve is disconnected Re-connect it Gas valve is faulty Replace it The board is faulty Replace it...
  • Page 93 Boiler shut-down, picture Low water inside heating Fill up system flashes: system CH system water pressure is low Leaks in the CH system Check system One of the two probes is Reconnect or replace Boiler shut-down, picture disconnected or in short- flashes: circuit Double flow probe fault...
  • Page 94 Boiler shut-down, picture flashes: External probe is not working ( error signalling Disconnected or faulty Reconnect or replace it probe occurs only when a heating request is active Boiler shut-down, picture Disconnected or faulty Reconnect or replace it flashes: probe Solar collector probe SCS fault (connected to...
  • Page 95 Boiler shut-down, picture Check parameter P60 flashes: Communication failure The main board does not value. It must between main board find all supplementary correspond to the boards or finds more than number of and supplementary the ones actually connected supplementary boards board(s) used Boiler shut-down, picture...
  • Page 96 Boiler shut-down, picture flashes: Safety circuit hardware fault Replace main board (fan relay) Boiler shut-down, picture flashes: Safety circuit hardware fault Replace main board (gas valve relay) Check air intake/flue Combustion air intake is gas vent ducts: clean insufficient or flue gas vent or replace as Boiler shut-down, Boiler combustion...
  • Page 97 Max. number of reset Boiler shut-down, picture flashes: attempts from remote Presence of one error Work directly on the control reached that can not be reset boiler (to reset the boiler, the power supply must be cut) IF NONE OF THESE HYPOTHESIS IS VALID, FAILURE IS ORIGINATED BY MAIN ELECTRONIC BOARD.
  • Page 100 FONDITAL GROUP Itaca Technic Manual Customer Service Department 1st edition, January 2013 AST 14 C 255 – 00...

This manual is also suitable for:

Itaca rtfs 28Itaca ctfs 24Itaca ctfs 28Itaca ctfs 32

Table of Contents