Fondital KC 24 Information Manual
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Fondital KC 24 Information Manual

Wall-hung boilers. instantaneous natural and forced draught and only heating. tahiti condensing pictor condensing
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INFORMATION MANUAL
Wall-hung boilers
FAMILY:
Instantaneous natural and
forced draught and only
UNIT:
heating
Tahiti Condensing
MODELS:
Pictor Condensing
Indoor
VERSIONS:
AST 14C120/00
CODE:
______________________________________________
1st Edition, Giugno 2007
________________________________________________________________________________
1
AST 14 C 120/00

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  • Page 1 INFORMATION MANUAL Wall-hung boilers FAMILY: Instantaneous natural and forced draught and only UNIT: heating Tahiti Condensing MODELS: Pictor Condensing Indoor VERSIONS: AST 14C120/00 CODE: ______________________________________________ 1st Edition, Giugno 2007 ________________________________________________________________________________ AST 14 C 120/00...
  • Page 2 Index NOTES ___________________Page 03 CHAPTER 01 TECHNICAL FEATURES 1.1 – Models 1.2 – Overall sizes 1.3 – Control panel 1.4 – Dimensions for installation 1.5 – Technical data ___________________Page 06 CHAPTER 02 FUNCTIONAL LAYOUTS 2.1 – Hydraulic layouts 2.2 – Condensation siphon 2.3 –...
  • Page 3 NOTES CONDENSATION The condensing boilers as of today, represent the most technologically advanced offer available on the market for domestic heating and the production of hot water. A solution that satisfies environmental protection requirements thanks to the emission of particularly reduced pollutants of this product. The condensing boilers have greater combustion efficiency to that of traditional boilers with consequent energy saving and a reduction of combustion consumption.
  • Page 4 Why and how do condensing boilers produce condensation? As known, during a combustion process of methane, as well as the production of heat, a determined quantity of carbon dioxide and steam are obtained. Everything is, in an analytic manner expressed in the following reaction: →...
  • Page 5 Reference regulations. The fact that yield exceeds 100% derives from the fact that the European Community Regulations prescribe, for all boilers, to calculate efficiency by referring to the net calorific value, which does not consider the condensation heat of steam; this method allows compare efficiency...

  • Page 6: Overall Sizes

    MAIN FEATURES: TAHITI-PICTOR condensing KC 24-32: condensing boiler combined instantaneous, waterproof chamber, forced draught, stainless steel composite heat exchanger, pre-aeration burner, modulating fan, 3-speed circulator with degaser, fifth class NOx emission; TAHITI-PICTOR condensing KR 24-32: condensing boiler only heating, waterproof chamber, forced draught, stainless steel composite heat exchanger, pre-aeration burner, modulating fan, 3-speed circulator with degasser, fifth class NOx emission;...

  • Page 7: Control Panel

    1.3 CONTROL PANEL Line bulb (green) Indication bulbs (red) Indication bulb (green) Boiler state – release boiler selector switch Domestic hot water temperature adjuster Heating water temperature adjuster Water manometer Aqua Premium system activation button The indication bulbs 1-8 can indicate two different situations: information in the case of normal functioning of the boiler or self-diagnostics in the case of anomaly or blocking of the boiler.

  • Page 8: Dimensions For Installation

    SELF-DIAGNOSTIC WARNING LIGHTS IN THE CASE OF ANOMALY OR BOILER BLOCKING Remote code Condition Green Yellow Flame control block ON L Safety thermostat block ON L Fumes thermostat block ON L Fluid circulation block ON L Delivery probe fault ON L ON L Domestic hot water probe fault ON L...
  • Page 9 DIMENSIONS AND OVERALL SIZES KC Key: S: Condensation discharge G: Gas inlet (G1/2”) M: Heating plant delivery (G3/4”) C: Domestic hot water outlet (G1/2”) F: Cold water inlet (G1/2”) R: Heating plant return (G3/4”) ________________________________________________________________________________ AST 14 C 120/00...
  • Page 10 DIMENSIONS AND OVERALL SIZES KR Key: S: Condensation discharge G: Gas inlet (G1/2”) M: Heating plant delivery (G3/4”) F: Cold water inlet (G1/2”) R: Heating plant return (G3/4”) ________________________________________________________________________________ AST 14 C 120/00...

  • Page 11: Technical Data

    1.5 TECHNICAL DATA NOMINAL DATA MODEL KC 24 KR 24 KC 32 KR 32 NOMINAL HEAT INPUT (QN) 23.7 23.7 31.4 31.4 NOMINAL HEAT INPUT (80 - 60°C) (PN) 22.7 22.7 30.5 30.5 NOMINAL HEAT INPUT (50 - 30°C) 24.8 24.8...

  • Page 12: Ast 14 C

    GAS CATEGORY SUPPLY RESSURE COUNTRY OF DESTINATION CATEGORY TYPE OF GAS (mbar) G20 - G31 20 – 37 ITALY 2H3P G20 - G31 20 – 50 AT – CH 2H3P G20-G25 / G31 20/20 – 50 2ELL3/P G25 - G31 25 –...
  • Page 13 Tahiti/Pictor Condensing KC/KR 32 GAS CIRCUIT NUMBER OF JETS TO THE BURNER JET DIAPHRAGM FAMILY BURNER N° GZ41,5 12.0 10.8 GZ350 10.8 10.7 10.8 10.7 10.8 G25.1 12.0 10.8 10.3 10.8 10.8 10.7 10.8 2E(R)B 10.8 10.8 10.0 FAN CALIBRATION PARAMETER KC/KR 24 KC/KR 32...

  • Page 14: Hydraulic Layouts

    CHAP. 2 FUNCTIONAL LAYOUTS 2.1 HYDRAULIC LAYOUTS Condensing KC ________________________________________________________________________________ AST 14 C 120/00...
  • Page 15 Condensing KR ________________________________________________________________________________ AST 14 C 120/00...
  • Page 16 Details of the hydraulic circuit: This boiler has two flow switches: as well as the one for domestic hot water, there is another one positioned on the delivery pipe of the heating circuit (see n° 6 in previous figures). This flow switch intervenes when the flow of fluid inside the heat exchanger is lower than 500 l/h for versions at 24 kw, 650 litres/h for the versions at 32 kw), and blocks ignition of the burner until adequate circulation inside the heat exchanger is re-established.
  • Page 17 2.2 CONDENSATION SYPHON The siphon is integrated into the boiler; it must not be filled because it is a siphon with float. It can be cleaned without opening the air chamber, by means of a cap facing outwards. The siphon prevents combustion products from entering the condensation discharge plants and therefore successively into the drain system.

  • Page 18: Hydraulic Unit

    2.3 HYDRAULIC UNIT MOTORISED THREE-WAY VALVE The boiler uses a 3-wat valve to vary the distribution of the water (secondary heat exchanger side or plant heating side). It is formed by a valve body without adjustable by-pass and by an electric motor (actuator). Electric motor Exit towards the plate heat...
  • Page 19 As it can be seen in the following images, the boiler ha san automatic internal by-pass. If leaks occur in the loading plant, which are caused by the intervention of the thermostatic valves, the by-pass guarantees minimum flow inside the primary heat exchanger. The by-pass therefore protects the condensing primary heat exchanger from over- temperatures due to the bad or lack of circulation of the water.
  • Page 20 RESIDUAL PRESSURE OF THE KC-KR 32 BOILER RESIDUAL PRESSURE OF THE KC-KR 24 BOILER ________________________________________________________________________________ AST 14 C 120/00...

  • Page 21: Primary Condensation Heat Exchanger

    EXPANSION VESSEL The condensing boiler has a 10 litre rectangular expansion vessel (Zilmet), with the following technical features: a maximum working pressure of 3 bar and a maximum working temperature of 90°C. 2.4 PRIMARY CONDENSATION HEAT EXCHANGER (GIANNONI) The heat exchanger is essentially built using stainless steel, oval section, spiral flattened pipes inside, which in the working phase are wrapped around theirselves.
  • Page 22 In fact the heat exchanger envisions two phases. The first phase (zone I, combustion) is made up of 3 elements (24 kW model) or 5 elements (32 kW model). Each element has 4 spirals in direct contact of the flame. The second phase (zone II, condensation), the coldest, is made up from an element positioned behind a deflector and heated...

  • Page 23: Pre-Aerated Burner

    2.5 PRE-AERATED BURNER The burner is made up from a stainless steel cylindrical housing fixed to the heat exchanger using an aluminium flange. A fume and condensation ring seal and a ceramic fibre insulant are attached to the flange. The external housing of the burner has circular and oblong holes with very small diameters in order to prevent back-fire.
  • Page 24 2.6 GAS UNIT MODULATING FAN (EBM) AIR-GAS MIXTURE SIT 848 GAS VALVE IN GAS ________________________________________________________________________________ AST 14 C 120/00...
  • Page 25 SIT 848 GAS VALVE Diaphragm OUT GAS Gas outlet pressure socket Maximum power Minimum adjustment power screw adjustment screw Gas inlet pressure socket IN GAS ELECTROVALVE ELECTRIC CONNECTIONS RESISTANCE VALUES Ev1≈887 Ω Ev2≈6.64 k Ω ________________________________________________________________________________ AST 14 C 120/00...
  • Page 26 A diaphragm positioned on exit from the gas valve assures a maximum limit in gas flow. The following table states the diameters of this diaphragm for the different modess and different types of fuel. Diaphragm diameter Methane (mm) 24 kW 32 kW MODULATING FAN (EBM) The fan ensures a constant flow of air on all of the modulation range: from maximum to...
  • Page 27 GAS UNIT FUNCTIONING – AIR/GAS ADJUSTMENT SYSTEM The flow of gas is generated directly from the air flow by means of the depression created by the fan and transmitted to the gas mechanism. A diaphragm positioned on exit of the gas valve ensures a maximum limit in the gas flow. By electrically powering the fan a depression is therefore created that is proportional to its speed along the gas valve-fan connection pipe.
  • Page 28 The suction device mixer (SIT391AGM), connected in correspondence with the fan suction vent, has lateral openings, which are used to measure the correct amount of primary air for combustion. The gas flow supplied to the burner will depend on the speed assumed by the fan. In this case the fan rotor also mixes the amount of air and gas before emission into the burner.
  • Page 29 FUMES EVACUATION PLANT (measurement points for the calculation of combustion efficiency) The boiler has a turret for connection of the fumes suction/discharge pipes. Holes have been prepared in the turret for direct access to the combustion agent air and fumes discharge.
  • Page 30 FUMES THERMOSTAT In the boiler, as can be noted from the hydraulic layout, there are two fume thermostats. One in correspondence with fumes discharge (intervention temperature 105°C) and one on the condensation heat exchanger (intervention temperature 169 °C). They are connected electrically in series and have a normally closed contact.

  • Page 31: Transformations

    CHAP. 3 ADJUSTMENTS 3.1 TRASFORMATIONS The SIT air/gas adjustment system does not require a nozzle to determine the gas flow. TRANSFORMATION FROM METHANE TO LPG make sure that the boiler is disconnected from the mains power supply remove the diaphragm on exit from the gas valve, replacing it with one having a diaphragm corresponding to the type of gas and the potentiality of the boiler (see the table in CHAP.

  • Page 32: Chimney Sweep Function

    start-up the boiler at maximum heat input, if possible removing a consistent quantity of domestic hot water with the domestic hot water temperature selector switch at maximum, or using the chimney sweep function. Calibrate the CO using the R.Q. ADJ ratio adjuster (indicated by A in the figure).
  • Page 33 CHAP. 4 FUNCTIONING LOGICS AND DIAGNOSTICS 4.1 CIRCUIT BOARD FOR THE MANAGEMENT OF THE CONDENSING BOILERS 6SCHEMOD10 Environmental External thermostat probe JUMPER Potentiometer P6 the card can manage different types of boilers therefore it is necessary to Jumpers: position the 2 jumpers correctly, which are visible in the figure, according to the indications of the serigraphy: In position F2PIA combined with secondary with plate In position F3RIS only heating,...
  • Page 34 MAIN GENERAL FEATURES Heating modulation with power ascent ramp Maximum boiler power in adjustable heating phase Heat adjustment with external temperature probe (optional) Domestic hot water priority Domestic hot water modulation Start-up phase with pre-set power Timed flame propagation phase at pre-set power Adjustable burner minimum power Boiler anti-freeze function Primary fluid circulation check function...
  • Page 35 HEATING MODULATION TEMPERATURES: Heating temperature adjustment range: 20°C – 78°C Heating thermostat intervention temperature: OFF = set point + 5° C Heating thermostat intervention temperature: ON = set point + 0° C Heating thermostat timing: 240 seconds (it is the time that the burner remains inactive after switch-off) Ascent ramp timing: 50 seconds.
  • Page 36 KDOTC heat adjustment curve co-efficient resolution <0.02 Heat adjustment curve co-efficients that select low temperature heating 0.0 ÷ 0.8 TSP5 parameter values that select the low temperature heating range 0 ÷ 75 Heat adjustment curve co-efficients that select high temperature heating 0.0 ÷ 3.0 TSP5 parameter values that select the high temperature range 76 ÷...
  • Page 37 VARIOUS VARIOUS TEMPERATURES Delivery probe boiler anti-freeze function <5°C >30 °C Domestic hot water probe boiler anti-freeze function <5°C >10 °C Fan function for delivery temperature 95°C 90°C Chimney sweep function 70°C 90°C Domestic hot water anti-freeze delivery OFF 60°C thermostat Delivery, domestic hot water, boiler temperature -20°C/+120°C...
  • Page 38 IGNITION PHASE AT PRE-SET POWER At every functioning request that leads to ignition of the burner, this is carried out by issuing a burner power that is pre-set by means of the TSP3 parameter (fan speed at burner ignition power). When the presence of the flame is detected, the successive flame propagation phase starts.
  • Page 39 HEATING OVER-TEMPERATURE THERMOSTAT During heating modulation, on reaching the minimum value of the power supplied to the burner, and maintaining the power condition supplied above that requested, when the delivery reaches the “set-point + 5°C” temperature, the burner is switched off. After the burner has been switched-off, wait for 240 seconds (thermostat timing), at the end of which, if the delivery is lower than the “set-point”...
  • Page 40 heat adjustment, the modulation card sends the external temperature value to the remote control and if the heating request is determined from the remote control it will be the latter that determines the value of the delivery temperature, on the basis of its heat adjustment curve and the environmental temperature it sets.
  • Page 41 DOMESTIC HOT WATER MODULATION During the domestic hot water phase the electric switch valve is in the domestic hot water position and the pump is powered. During domestic hot water modulation, on reaching the minimum value of the power supplied to the burner and maintaining the power condition supplied higher than that requested, when the delivery reaches the “set-point + 5°C”...
  • Page 42 DOMESTIC HOT WATER ANTIFREEZE FUNCTION The temperature of the domestic hot water is measured using the NTC probe and when this falls below the temperature of 5 °C a functioning request in the domestic hot water functioning phase is generated, the pump is put into circulation and after a wait of about 30 seconds the burner is ignited.
  • Page 43 PUMP ANTI-BLOCK AND ELECTRIC SWITCH VALVE FUNCTION DUE TO INACTIVITY The circuit board counts the time passed from when the pump has been deactivated: if this period of time is equal to 24 hours the pump, together with the switch, is activated for a period of time equal to 180 seconds.
  • Page 44 CHECK INTEGRITY OF THE BRUSHLESS FAN Fan speed is constantly monitored in order to detect any anomalous conditions. In stand by conditions, a speed exceeding 500 rpm for a period of time longer than 20 seconds determines a fan alarm signal with consequent block.
  • Page 45 SAFETY THERMOSTAT AND FUMES THERMOSTAT The safety thermostat and the fumes thermostat are normally closed contacts. They are connected logically in series with the gas valve operator and managed directly from the automatic flame control. When open, the gas valve power supply is interrupted immediately and if it remains open for a time > TW+TS the block is obtained with the execution of post-ventilation of 6 minutes and post-circulation (180 seconds in Heating and 30 seconds in Domestic hot water).

  • Page 46: Troubleshooting

    TROUBLESHOOTING State of the boiler Problem Possible cause Solution Check the presence of the gas. Check opening of the taps or There is no gas the intervention of any safety valves installed on the network The burner does not switch-on pipes.
  • Page 47 The flow switch is blocked Replace it The boiler does not work, LED 3 The fan is not connected Check the fan. (red) and LED 8 (yellow) flash correctly The fan does not function correctly simultaneously. The fan is broken Replace it LED 4 (red) and LED 8 (yellow) Check the connections of the...
  • Page 48 ________________________________________________________________________________ AST 14 C 120/00...
  • Page 49 EXAMPLE OF APPLICATION WITH AREA PLANTS + VALSIR SYSTEM DISENGAGER ________________________________________________________________________________ AST 14 C 120/00...
  • Page 50 CHAP. 5 DISCHARGES AND PIPING Specific pipes and systems must be used for the air suction/fumes discharge in original condensing boilers as envisioned by the manufacturer, which are resistant to the attack of condensation acids. The discharge pipes must be installed with a slope towards the boiler such to guarantee the reflux of the condensation towards the combustion chamber, which is constructed to collect and discharge the condensation.
  • Page 51 COAXIALS Ø 125/80 Type C13 - Type C33 Loss of hot air load COAXIAL PIPES Ø 80/125 Component KC/KR 24 KC/KR 32 Extension L= 1000 mm Extension L= 500 mm Curve 90° Curve 45° Roof discharge terminal Wall terminal TYPE OF PIPE PIPE MATERIALS KC/KR 24...
  • Page 52 FONDITAL GROUP Information manual Tahiti-Pictor Condensing Customer Service Edition 1, Giugno 2007 AST 14 C 120 – 00...

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