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AST 14 C 255/00

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

CH system flow

Cold water inlet

Gas inlet

CH system return

Содержание ITACA CTFS 24

Страница 1: ...ng boilers GROUP Instantaneous type and forced draught heating only MODELS Itaca VERSIONS For indoor and outdoor installation PART NO AST 14 C 255 00 ______________________________________________ 1st...

Страница 2: ...c 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 C...

Страница 3: ...________________________________________________________________________________ 3 AST 14 C 255 00...

Страница 4: ...nstallation 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...

Страница 5: ...______________________________________________________ 5 AST 14 C 255 00 RTFS and CTFS VERSIONS G Gas inlet 1 2 M CH system flow 3 4 R CH system return 3 4 AF Cold water inlet 1 2 AC Domestic hot wate...

Страница 6: ...________________________________________________________________________________ 6 AST 14 C 255 00 INSTALLATION TEMPLATE...

Страница 7: ...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...

Страница 8: ...s 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...

Страница 9: ...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 g...

Страница 10: ...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 p...

Страница 11: ...ng 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 w...

Страница 12: ...stats 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...

Страница 13: ...nt 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 progra...

Страница 14: ...r 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 nu...

Страница 15: ...isplayed 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 pe...

Страница 16: ...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 Warn...

Страница 17: ...TFS 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 Tr...

Страница 18: ...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 M...

Страница 19: ...tion 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...

Страница 20: ...r 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...

Страница 21: ...and another unit made of thermosetting polymers connecting the cold water inlet pipe to the rest of the hydraulic system The stainless steel plate exchanger consists of 26 plates for all versions 24...

Страница 22: ...mostatic valve triggering the by pass ensures a minimum flow rate inside the primary exchanger The function of the by pass is to protect the primary exchanger from overtemperatures due to poor water f...

Страница 23: ...eed 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 CTFS 24 kW...

Страница 24: ...e standard flow switch The flowmeter transmits a pulse signal which is received and utilised by the electronic board as the frequency used to determine the litres to be drawn l min imp l Imp l MIN Imp...

Страница 25: ...rresponds to an increase in the water volume As no further space is available the increase will affect the pressure and not the volume If pressure value exceeds safety valve triggering point this latt...

Страница 26: ...ove boiler front casing release the expansion tank place it as shown in previous paragraph remove combustion chamber panel remove fan and flue gas hood release the sealing clips pull the exchanger upw...

Страница 27: ...urrent of gas modulation coil at the end of the ignition ramp for CTFS boilers 80 of maximum current Current of gas modulation coil at the end of the heating rising ramp At maximum CH output P7 Coils...

Страница 28: ...e boiler is at least equal to the minimum value needed for the boiler to work properly Power of flue gas fan as well as pressure switch for ventilation control vary depending on boiler model A double...

Страница 29: ...re is too low boiler proper operation is not guaranteed remove the plastic cover protecting the adjustment screws at the top of the modulation coil then connect the pressure gauge to the gas outlet pr...

Страница 30: ...maximum output set by parameter P7 The display will show simultaneously the current mA supplied to the modulation coil the flow temperature the system pressure the lit flame symbol with burner on the...

Страница 31: ...aintain the flow set point 4 3 GAS CONVERSION Boilers are manufactured to run on the type of gas natural gas or LPG specifically required upon purchase order placing and any conversion shall be made b...

Страница 32: ...n the latter case it is possible to access only up to the 29th parameter TECHNICAL parameter editing To access the parameter setting mode press reset and boiler status keys simultaneously for three se...

Страница 33: ...code must be entered default 1398 with the and heating keys confirm each single number with the ok key After entering the correct entry code an icon will be displayed showing that the super technical...

Страница 34: ...ransducer 1 low water pressure switch P3 Boiler type selection 1 3 1 1 combined instantaneous 2 heating only 3 with water heater P6 Ignition output setting 0 to 100 0 0 operation with ignition ramp 0...

Страница 35: ...5 78 C P10 1 low temp 35 C P10 1 high temp 40 C P28 Selection of hydraulic control only for heating only version 0 1 0 0 pump deviating valve 1 double pump P29 Default parameters setting except for P0...

Страница 36: ...temperature Visible only with connected ambient probe P50 Display of ambient probe SA2 temperature Visible only with connected ambient probe P51 Triggering temperature difference OFF ambient probe SA...

Страница 37: ...election of zone 2 curve 0 3 1 100 0 6 It can be set only with connected zone board Without external probe value 1 reduced range low temperature P63 Zone 2 set point selection fictitious temp 5 30 C 2...

Страница 38: ...0 standard function 1 relay energised P85 Zone 3 mixing valve forcing 0 2 0 0 standard function 1 force opening 2 force closing P87 Zone 4 pump relay forcing 0 1 0 0 standard function 1 relay energis...

Страница 39: ...ard micro switch reset 30 reset operations correspond to one month Automatic filling with P94 1 P10 Filling pressure ON and low water alarm E04 0 4 1 Bar 0 4 Bar P11 Filling pressure OFF 1 2 Bar 1 Bar...

Страница 40: ...S boiler with ramp enabled 0 to 4 s 2 P26 DHW water flow measurement 0 2 2 0 flow switch 1 flowmeter 2 automatic mid interface flow switch top interface flowmeter P27 Gas valve modulation coil short c...

Страница 41: ...ay Presetting for connection to supplementary boards Temperature probe integrity check Anti shut down function Post ventilation function Pump post circulation function Anti freeze function Automatic f...

Страница 42: ...see previous section to select the current output curve to be applied to the gas proportional modulation coil in order to achieve the correct modulation 24 kW 24kW GPL TFS 24kW GPL TN CORRENTE MODULA...

Страница 43: ...ly boilers to which a DHW system is combined the board is able to manage different hydraulic configurations through parameter P28 default setting is 0 depending on system type The two configurations a...

Страница 44: ...h time the gas valve is kept open energised and the igniter is cut out Hereinafter is boiler operation logical diagram In case no flame is detected during an ignition attempt the automatic flame contr...

Страница 45: ...control has detected the flame Flame propagation will now take place if temperature is below 35 C i e the modulation coil will be supplied with current for maximum two seconds super technical paramet...

Страница 46: ...Upon an operation request in plate DHW mode if the water temperature read by the domestic hot water NTC probe is lower than the set point value 3 C plate DHW thermostat triggering temperature ON the b...

Страница 47: ...rature with plate DHW mode ON 80 C Flow water PID triggering temperature with DHW mode 81 C Flow water PID deactivating temperature with DHW mode 75 C N B In case the boiler is combined with a solar p...

Страница 48: ...bled and disabled with the COMFORT ok key to achieve the three star efficiency when the boiler is in DHW mode When this function is enabled COMFORT will appear on the boiler display and the maintenanc...

Страница 49: ...the error E43 will be displayed Warning in case of particularly complex zone systems refer to instruction manual supplied along with the zone board kit In any case it is not possible to manage more t...

Страница 50: ...WITH AMBIENT PROBES P57 4 To allow for managing the heating zones using the ambient probes they have to be enabled i e value of parameter P57 must be different from 4 Ambient probe 1 SA1 is associated...

Страница 51: ...0 and 03 respectively P57 0 Modulation on off In this case an external probe is not necessary and flow temperature is set with heating key at fixed point 35 45 C or 35 78 C for both circuits P57 1 Amb...

Страница 52: ...e fault is signalled with the relevant error code E43 resulting in heating circuit disabling if operating The most common errors that can lead to this fault are connected with the use of the supplemen...

Страница 53: ...iting mode press PROG key repeatedly press twice to access heating programme for zone 1 press three times to access heating programme for zone 2 press four times only for RTFS with P3 3 to access the...

Страница 54: ...water temperature will constantly be read and the rising ramp will be stopped with a PID type action upon reaching the set temperature in order to maintain the selected flow temperature Upon reaching...

Страница 55: ...ameter P27 35 78 C default 40 C Heating output rising ramp timing by means of parameter P12 0 10 min default 1 min Heating modulation temperature reduced range P10 1 Heating temperature setting reduce...

Страница 56: ...probe WARNING flow temperature value will anyway be limited within the maximum limit whatever the result of the calculation may be 78 C standard range or 45 C reduced range THERMOREGULATION WITH EXTER...

Страница 57: ...eating request comes simultaneously from the remote control and the amb T contact closing on the board both the remote control and the modulation board independently calculate the flow temperature acc...

Страница 58: ...l formula In either case it will be necessary to check the temperature changes so as to correct and choose the proper curve accurately In the former case you will simply need to take an actual value o...

Страница 59: ...meters Connect the remote control to the board with two non polarised conductor When the connection is done Con will appear on the boiler LCD display Instead of the remote control an ambient thermosta...

Страница 60: ...ferent function by setting parameter P17 P17 0 Alarm reference Upon each shut down or fault the relay is energised Electrical connections P17 1 Remote control reference Upon each request from the remo...

Страница 61: ...remains in the rest condition boiler integration when the temperature detected by the SBS probe is lower than the DHW set point temperature 2 C Instead it is supplied with power solar only mode when t...

Страница 62: ...ed respectively on the solar collector SCS and at the bottom of the solar water heater SBS Water heater filling conditions pump ON Boiler temperature is set with parameter P19 which corresponds to a v...

Страница 63: ...solar water heater temperature is reached For this reason solar pump PS is reactivated according to the following logic Tscs P22 10 C and Tsbs 93 C and Tscs P22 5 C The function stops when the PS is s...

Страница 64: ...be 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 respectivel...

Страница 65: ...ose function is to close the RS 485 communication line in case of problems in the transmission of data between the boards due to very long connection lines or to electromagnetic disturbances Leave onl...

Страница 66: ...ient 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...

Страница 67: ...w temperature whereas parameter P31 the current one detected by the boiler probe Zone 2 parameter P62 setting to set the thermoregulation curve with external probe or the operation range without exter...

Страница 68: ...5 C When domestic hot water is drawn heating requests are interrupted and then re activated when domestic hot water draw is finished Heating functions are disabled when the boiler is in the OFF or SUM...

Страница 69: ...he deviating valve is enabled in solar only mode while 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 B...

Страница 70: ...down to the set point value by transferring excess heat from the boiler to the solar collector This occurs only if the solar water heater exceeds the set point temperature following the activation of...

Страница 71: ...gy to a secondary item through the deviating valve VM Plant diagram is shown below Water heater filling function pump ON Boiler temperature is set with parameter P19 which corresponds to a value rangi...

Страница 72: ...the solar pump PS is reactivated with valve VM in boiler filling mode according to the following logic Tscs P22 10 C and Tsbc 95 C and stopped when one of the following conditions occurs Tscs P22 12 C...

Страница 73: ...int temperature following the activation of the heat transfer function If the remote control is not connected the water heater cooling function is always enabled otherwise it is enabled only from 00 0...

Страница 74: ...n HEAT TRANSFER HEAT DISCHARGE P22 10 C SCS P22 Psol OFF VM in water heater position END SBC 95 C HEAT TRANSFER VM in water heater position Psol ON SCS P22 12 C SBC 95 C SCS P22 P76 1 HEAT DISCHARGE V...

Страница 75: ...timer From 0 to 300 s P74 Initial closing timer with powered board P74 40 s Request end closing timer P74 20 s Post circulation timer From boiler with P13 Circulation pump anti shut down timer 3 s ea...

Страница 76: ...8 4452 50 4168 3904 3660 3433 3222 60 3026 2844 2674 2516 2369 70 2232 2104 1984 1872 1767 80 1670 1578 1492 1412 1336 90 1266 1199 1137 1079 1023 Correct operating range from 20 to 120 C general tole...

Страница 77: ...ng if this time is equal to 24 hours the pump along with the deviating valve P28 0 or the DHW pump P28 1 will be enabled again for 30 seconds During the pump anti seizing function the burner remains o...

Страница 78: ...to end in order to carry out such request ANTI FREEZE FUNCTION Flow water A flow NTC probe measures the water temperature inside the boiler and if it falls below 5 C it generates an operation request...

Страница 79: ...s the DHW boiler temperature and if it falls below 5 C it generates an operation request in boiler anti freeze mode The pump is activated and after a 30 sec waiting time the burner ignites with output...

Страница 80: ...he same time there is no signalling of the errors respectively E04 and E08 relevant to the max number of filling attempts reached within the 24 hours P16 or to the exceeding of the maximum time for ea...

Страница 81: ...yway performed with the burner working at minimum output The faulty modulation coil signal is interrupted when its electric parameters return within the preset limits SAFETY DEVICES AND FUNCTIONS Doub...

Страница 82: ...re than one minute and must be reset Differential pressure switch CTFS 24 kW 35 45 Pascal Pmax 1500 Pa Differential pressure switch CTFS 28 32 kW 125 112 Pascal Pmax 1500 Pa Pressure transducer shut d...

Страница 83: ...this shut down status power off and back on to start a new self recognition cycle Warning during the boiler type recognition step no request is performed 3 bar safety valve This valve is installed on...

Страница 84: ...nes The communication between the two boards is made through a cable with a RS485 connection and 24V power supply Main board characteristics Operating voltage from 170Vac to 300 Vac Power supply frequ...

Страница 85: ...rmostat 2 3 4 ambient thermostat 1 or Remote Control L 30m 5 6 external probe 10K Ohm at 25 C B3977 L 100m 7 8 cold water inlet probe S3S for CTFS version already connected or boiler water heater prob...

Страница 86: ...nd detection electrode FL flowmeter MVD motorised deviating valve SS DHW probe OUT NTC 10K Ohm VG gas valve S3S DHW probe IN NTC 10K Ohm P boiler modulation circulation pump APS air pressure switch V...

Страница 87: ...the boiler 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 excluding the first elbow connected to the b...

Страница 88: ...pes 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 elbow maximum permissible length is to be reduced by 1 metre where...

Страница 89: ...gas vent mm 1 L 3 39 8 3 L 14 42 14 L 26 45 26 L 34 49 34 L 42 supplied to 28 kW flue gas vent diaphragms Pipe length m Diaphragm diameter flue gas vent mm 1 L 18 45 18 L 23 47 For 32 kW flue gas vent...

Страница 90: ...ll vent terminal 4 4 4 5 Roof vent terminal 4 4 4 5 Vertical stub pipe 0 1 0 1 Vertical condensate drain 2 8 2 9 Horizontal condensate drain 0 3 Chinese type vertical vent terminal 4 8 4 9 5 Suction o...

Страница 91: ..._________________________ __________________________________________________ __________________________________________________ __________________________________________________ _____________________...

Страница 92: ...electrode Electronic board does not detect flame it is faulty Replace the board Ignition heat input setting is too low Increase it Minimum heat input is not set correctly Check burner setting Boiler s...

Страница 93: ...system Check condition of flowmeter filter Flowmeter sensor is faulty or disconnected Connect or replace it DHW probe does not output enabling Probe not correctly set Replace the probe Boiler shut dow...

Страница 94: ...flashes Solar water heating probe SBS fault connected to the boiler board Disconnected or faulty probe Reconnect or replace it Probe detects a value lying outside the admissible range Make sure the pr...

Страница 95: ...ture flashes Configuration error between ambient probe remote control or supplementary zone board The main board does not recognise the settings matched with the zones Check the system configuration p...

Страница 96: ...switch replace it if faulty Silicone pipe of flue gas pressure switch clogged or not connected Connect or clean pipe as necessary Fan is faulty Replace it Boiler shut down picture flashes Incompatibi...

Страница 97: ...the boiler IF NONE OF THESE HYPOTHESIS IS VALID FAILURE IS ORIGINATED BY MAIN ELECTRONIC BOARD YOU CAN JUST CHECK CONNECTIONS OR CHANGE THE BOARD WARNING The touch screen interface performs a keyboar...

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Страница 100: ...FONDITAL GROUP Itaca Technic Manual Customer Service Department 1st edition January 2013 AST 14 C 255 00...

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