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ANTEA NEXT KC 18-26-30-35 KR 12-24-28-32 KRB 12-24-28-32 INSTALLATION AND MAINTENANCE MANUAL Translation of the original instructions (in Italian) It is compulsory to read this manual before proceeding with the boiler installation, use and maintenance operations. This boiler is intended for production of hot technical water only: •...
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General information Dear Sirs, thank You for choosing and buying one of our products. Please read these instructions carefully in order to properly install, operate, and maintain the product. Following the boiler installation, the installer should advise the user about boiler operation and its safety devices. The USER MANUAL and the INSTALLATION AND MAINTENANCE MANUAL are an integral and essential part of the product.
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WARNING This boiler must be installed inside the building or in a partially sheltered place. A partially sheltered place is a place which is not directly exposed to atmospheric agents. Any installation in a place that is not partially sheltered is forbidden. DANGER This boiler must be correctly and safely connected to an electrical system compliant with the existing technical stand- ards.
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III conditions and to ensure fully safe maintenance operations. If the power cable is damaged, it must be replaced by Fondital or its technical service department or a similarly qualified person in order to prevent any risk.
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The user is strongly advised to have the system serviced and repaired by qualified personnel, satisfying all prevailing law require- ments, and trained to properly carry out these operations. In the event of long periods of inactivity of the boiler, disconnect it from the electrical power mains and close the gas cock. WARNING With the electrical power disconnected and the gas cock closed, the device's electrical anti-freeze function does not work.
1. Technical features and dimensions Technical features This boiler is equipped with a fully pre-mixed gas burner. The following models are available: • KC condensing boiler with sealed chamber and forced draught, supplying CH water and instant DHW production; • KR condensing boiler with sealed chamber and forced draught, supplying CH water only.
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1.1.3 Operating features • CH electronic flame modulation with timer-controlled rising ramp (60 seconds, adjustable). • DHW electronic flame modulation (KC and KR/KRB models with optional external water heater). • DHW priority function (KC and KR/KRB models with optional external water heater) •...
Dimensions KC model Fig. 1 KC model dimensions Trap CH system flow (3/4”) DHW outlet (1/2") 3-bar safety valve discharge outlet Gas inlet (3/4”) Cold water inlet (1/2") CH system return (3/4”) Technical features and dimensions...
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KR model Fig. 2 KR model dimensions Trap CH system flow (3/4”) 3-bar safety valve discharge outlet Gas inlet (3/4”) Cold water inlet (1/2") CH system return (3/4”) Technical features and dimensions...
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KRB model Fig. 3 KRB model dimensions Trap CH system flow (3/4”) Water heater secondary flow (1/2") 3-bar safety valve discharge outlet Gas inlet (3/4”) Water heater secondary return (1/2") CH system return (3/4”) Technical features and dimensions...
Hydraulic diagrams KC model Condensate drain CH system flow DHW outlet Gas inlet 24 23 22 Cold water inlet CH system return Fig. 4 KC hydraulic diagram 1. Condensate trap 14. 3-bar safety valve 2. Modulating gas valve 15. Minimum pressure switch 3.
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KR model Condensate drain CH system flow Gas inlet Cold water inlet CH system return Fig. 5 KR hydraulic diagram 1. Condensate trap 11. Expansion vessel 2. Modulating gas valve 12. Fan check probe 3. Flow temperature twin probe 13. Return temperature probe 4.
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KRB model Condensate drain CH system flow Water heater flow RB R Gas inlet Return from the water heater CH system return Fig. 6 KRB hydraulic diagram 1. Condensate trap 11. Expansion vessel 2. Modulating gas valve 12. Fan check probe 3.
Operating data Burner pressures reported in the following page must be verified after the boiler has been operating for 3 minutes. Gas category: II2H3P WARNING The boiler is suitable for the use of group H and/or group E fuel gases and mixtures of natural gas and hydrogen up to 20% by volume.
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Description Max. output Min. output 30% load Casing heat loss with burner on 0,00 6,75 Casing heat loss with burner off 0,42 Flue system heat loss with burner on 1,99 8,62 Flue system mass capacity Flue temp. – air temp. °C Heat output efficiency rating (80-60°C) 98,0...
Annual fuel consumption Contact details: FONDITAL S.p.A. - Via Cerreto, 40 I-25079 VOBARNO (Brescia) Italia - Italy (*) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet. (**) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet).
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Sound power level, indoors Contact details: FONDITAL S.p.A. - Via Cerreto, 40 I-25079 VOBARNO (Brescia) Italia - Italy (*) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet. (**) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C return temperature (at heater inlet).
2. Instructions for the installer WARNING The information in this section of the manual is for qualified personnel only. The user is not authorised to carry out such operations. Installation standards This boiler must be installed in compliance with the laws and standards in force in the country of installation, which are herein con- sidered as entirely transcribed.
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Fig. 7 Paper template Instructions for the installer...
Installing the boiler DANGER Before connecting the boiler to CH and DHW system pipes, clean the latter carefully. Before commissioning a NEW system, clean it to remove any metal chips due to machining and welding, and any oil and grease that might negatively affect boiler operation or even damage it in case they get inside it. Before commissioning a RECONDITIONED system (where radiators have been added, the boiler has been replaced, etc.) thoroughly clean it to remove any sludge and residues.
Air intake and flue gas venting system Flue gas discharge into the atmosphere and air intake/flue gas venting systems must comply with applicable laws and standards in the country of installation that are considered as fully transcribed herein. DANGER For the air intake/flue gas venting systems, specific, manufacturer-approved, condensate acid-resistant pipes and sys- tems must be used, suitable for condensing boilers.
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2.7.1 Starter kit installation Refer to Fig. 9 Split kit installation and to Fig. 10 Coaxial kit installation. DANGER There must be no leakage of combustion by-products from any of the gaskets. Split kit (optional) Clean the boiler roof from dust and other debris due to any masonry works. Fix the adhesive gasket under the flange connection for flue gas venting system (A).
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2.7.2 Pipe and terminal installation DANGER Flue gas venting pipes are to be installed tilted toward the boiler so that condensate runs toward the combustion cham- ber, which is designed for condensate collection and drainage. Should the above procedure not be possible, it is necessary to install, in condensate stagnation areas, devices designed for condensate collection and conveying to the condensate drain system.
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Wall-mounted terminals The final parts of air intake and flue gas venting terminals, both split and coaxial, feature a groove (A) to fix the external collar (see Fig. 13 Wall-mounted terminal installation). Insert the external collar into the terminal until reaching the groove. Insert the terminal, from outside, making the external collar adhere to the wall.
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Roof flues Insert the air intake and/or flue gas venting flue from above through the tile. Position the rainproof collar (A) until it bottoms on the cap of the tile for roofs (B) and fix it with the screw supplied. Keep the distance indicated in the figure between the rainproof collar and the terminal.
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2.7.3 Possible configuration of air intake and flue gas venting ducts Type B23/B23P Boiler intended for connection to an existing flue system external to the boiler room. Combustion air is taken directly from the boiler room itself while flue gas is conveyed to the outside. The boiler is not to be fitted with anti-wind gust device;...
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2.7.4 Length of air intake and flue gas venting ducts Lengths are expressed in equivalent metres on flue gas vent (m To calculate the actual length of the air intake/flue gas vent system, flow resistances of the accessories must be used (see Flow re- sistance tables on page 37).
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KC 26 - KR/KRB 24 Intake pipe Vent pipe diam- Max intake Max venting Max total length diameter eter length length Type of installation [mm] [mm] Ø 80 B23/B23P Ø 80 + Ø 60 Ø 80 + Ø 50 C43/C43X Ø...
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KC 30 - KR/KRB 28 Intake pipe Vent pipe diam- Max intake Max venting Max total length diameter eter length length Type of installation [mm] [mm] Ø 80 B23/B23P Ø 80 + Ø 60 Ø 80 + Ø 50 C43/C43X Ø...
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KC 35 - KR/KRB 32 Intake pipe Vent pipe diam- Max intake Max venting Max total length diameter eter length length Type of installation [mm] [mm] Ø 80 B23/B23P Ø 80 + Ø 60 Ø 80 + Ø 50 C43/C43X Ø...
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2.7.5 Flow resistance tables Flow resistance of separate ducts Ø 80 mm (in equivalent metres on flue gas vent (m KC 18 KC 26 KC 30 KC 35 KR 28 KR 32 Component Code KR 12 KR 24 KRB 12 KRB 24 KRB 28 KRB 32...
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Flow resistance of separate ducts Ø 80 + Ø 60 mm pipework (in equivalent metres on flue gas vent (m KC 18 KC 26 KC 30 KC 35 Component Code KR 12 KR 24 KR 28 KR 32 KRB 12 KRB 24 KRB 28 KRB 32...
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Example of calculation WARNING It is compulsory to protect air intake and flue gas vent from the ingress of external objects by means of the appropriate protective terminals/grids. Maximum 60 mm ducted vertical pipe calculation with 4 m suction and 4 m vent with 80 mm duct before reducing to 60 mm to be ducted on a vertical lightwell.
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KC 30 - KR/KRB 28 Total available equivalent metres = 111 m Available residual equivalent metres = (111 - 31) = 80 m Equivalent flow resistance on a 1m section of Ø60 vent pipe = 4.5 m Maximum length of vertical section Ø60 (excluding terminal) = 80 / 4.5 = 17.8 m KC 35 - KR/KRB 32 Total available equivalent metres = 85 m Available residual equivalent metres = (85 - 33) = 52 m...
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Fig. 17 Type C13 - C33 coaxial ducts A. Gasket B. Blanking cap Fig. 18 Coaxial ducts C93 Accessory code (option) Description 0PIASINT01 Ø 80/125 pipework plate kit 0PIASINT02 Ø 60/100 pipework plate kit Instructions for the installer...
Measuring combustion efficiency during operation 2.8.1 Flue cleaning function The boiler features a flue cleaning function which must be used to measure combustion efficiency during operation and to adjust the burner. To activate the flue cleaning function, it is necessary to: •...
Connection to gas mains Gas pipe cross-section must be chosen depending on its length, layout pattern, gas flow rate. Gas supply pipe cross-section must be equal or greater than boiler pipe. DANGER Comply with installation standards enforced in the country where the boiler is installed which are considered as fully transcribed in this booklet.
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2.10.2 DHW Prior to installing the boiler, the hydraulic system is to be cleaned in order to remove impurities; they could be present in system com- ponents and damage the pump and the heat exchanger. KC Model Cold water inlet and DHW outlet shall be connected to the boiler through the dedicated 1/2" F and C fittings. Hardness of water supplied to the boiler may increase the plate heat exchanger cleaning/replacement intervals.
2.11 Connection to electrical mains The boiler is supplied with a three-pole power cable, already connected to the electronic board and it is provided with a safety clamp. The boiler is to be connected to a 230V-50Hz electrical power supply. When connecting it to power mains, follow correct phase / neutral polarity sequence.
2.14 Installation and operation with Open Therm Remote Control (optional) WARNING Only use original Remote Controls supplied by the manufacturer. The correct operation of the Remote Control itself and of the boiler is not guaranteed if non-original Remote Controls not supplied by the manufacturer are used.
2.15 Selecting the operating range in heating mode To set the water temperature for central heating, proceed as follows: • turn the encoder (key B), the area where the heating symbol is located turns grey; • press the encoder; • turn the encoder clockwise or anticlockwise to increase or decrease the central heating setpoint temperature; •...
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The temperature probe must be installed on an outside wall facing NORTH - NORTH EAST, in a position protected from weather. Do not install near a window, ventilation openings or sources of heat. The external temperature probe automatically modifies the CH flow temperature in relation to: •...
2.17 TSP parameters • press the menu ( ) key for 10 seconds; • turn the encoder (key B), the area where the heating symbol is located turns grey; • press the encoder; • turn the encoder clockwise or anticlockwise to scroll the parameter list. As soon as you reach the one to be edited, press the en- coder;...
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Parameter Settable values Default values Notes 12 kW - 18 kW = 69 P7 - TSP7 24 kW - 26 kW = 88 According to the 10 ÷ 100% model Fan speed at heating maximum output 28 kW - 30 kW = 89 32 kW - 35 kW = 89 P10 - TSP10 (*) 0 ÷...
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Parameter Settable values Default values Notes P35 - TSP35 -5.0 ÷ +5.0 °C 0 °C Ambient temperature probe correction range that can be set via parameter for zone 2 P36 - TSP36 only with connected ambient probes and 0.0 ÷ 1.0 °C 0 °C Triggering temperature differential OFF can zone board...
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Settable Default Parameter Notes values values P57 - TSP57 0 ÷ 15 °C 5 °C only if P306 = 1 Frost protection start temperature for ambi- ent/external probes P58 - TSP58 0 ÷ 15 °C 6 °C only if P306 = 1 Frost protection end temperature for ambi- ent/external probes P60 - TSP60...
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Parameter Settable values Default values Notes P64 - TSP64 0 ÷ 300 Selection of zone 2 curve can be selected from home page on the display 5 ÷ 30 °C 20 °C only with external probe/ambient probe required ambient temperature setpoint can be selected from home page on the P65 - TSP65 display...
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Parameter Settable values Default values Notes 0 = standard function P84 - TSP84 0 ÷ 2 1 = relay energised Zone 3 pump relay forcing 2 = relay not energised 0 = standard function 1 = force opening P85 - TSP85 0 ÷...
2.18 Filling the system Once all boiler connections have been completed, CH system can be filled. The procedure is to be cautiously carried out, following each step: • Open the bleeding valves on all radiators and verify the boiler automatic valve operation. •...
2.20 Available head The boiler is equipped with a high-efficiency circulation pump with variable speed. Circulation pump speed is automatically managed by the electronics, based on the settings of "super technical" parameters of the boiler. It is possible to choose between two pump working modes: 1 “Constant ΔT”...
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100% 55% (*) 39% (**) 1000 1200 Fig. 25 Available head KC 26 - KR/KRB 24 100% 55% (*) 45% (**) 1000 Fig. 26 Available head KC 30 - KR/KRB 28 Q ... . Flow rate (l/h) H .
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100% 55% (*) 34% (**) 1000 1200 1400 1600 Fig. 27 Available head KC 35 - KR/KRB 32 Q ... . Flow rate (l/h) H ... . Available head (mbar) (*) Minimum curve that can be used in systems without hydraulic separator (**) Minimum curve that can be used in systems with hydraulic separator Instructions for the installer...
2.21 Wiring diagrams REMOTO 230 VAC ~ 50Hz Sext SBS SCS SA/SDIS 9 10 Fig. 28 Wiring diagram KC (I) WARNING The cables of multifunction relay (19-20-21-22-23-24) must be set inside suitable cableways, separate from any other ca- bles (1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18). Instructions for the installer...
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nero marr. Fig. 29 Wiring diagram KC (II) Instructions for the installer...
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REMOTO 230 VAC ~ 50Hz Sext SBS SCS SA/SDIS 9 10 Fig. 30 Wiring diagram KR (I) WARNING The cables of multifunction relay (19-20-21-22-23-24) must be set inside suitable cableways, separate from any other ca- bles (1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18). Instructions for the installer...
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nero marr. Fig. 31 Wiring diagram KR (II) Instructions for the installer...
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REMOTO 230 VAC ~ 50Hz Sext SBS SCS SA/SDIS 9 10 Fig. 32 Wiring diagram KRB (I) Instructions for the installer...
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nero marr. Fig. 33 Wiring diagram KRB (II) Instructions for the installer...
2.22 Adaptation to other gas types and burner adjustment WARNING This boiler is built to run on the type of gas specified on the packaging and on the boiler rating plate. Any later transformation is to be exclusively carried out by qualified personnel, using manufacturer designed accesso- ries and following the procedure and adjustment instructions for an accurate boiler setting-up.
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2.22.1 Gas valve setting WARNING In the case of a boiler connected to a gas distribution network that could receive a methane-hydrogen mixture of up to 20% (20%H2NG) see paragraph Mains gas valve setting 20%H2NG on page 69. Fig. 35 Gas valve setting 2.22.1.1 Maximum heating output adjustment •...
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Flue CO value Flue CO value Diaphragm diam- Supply pressure eter Model Fuel Max. output Min. output [mbar] [mm] KC 18 Natural gas G20 9,30 ± 0,45 9,00 ± 0,45 KR 12 Propane Gas G31 10,20 ± 0,45 9,00 ± 0,45 KRB 12 KC 26 Natural gas G20...
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2.22.2 Mains gas valve setting 20%H2NG WARNING In the case of a boiler connected to gas distribution mains, which could receive a methane-hydrogen mixture of up to 20% (20%H2NG), a combustion analyser with direct oxygen measurement must be used, regularly calibrated, and the adjustment must be made using the O and offset pressure values as a reference.
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-x Pa Fig. 36 Offset pressure adjustment Offset pressure value value Supply pres- Diaphragm maxi- Qmin sure diameter mum value Model Fuel Qmax Qmin Lower Upper [mbar] [mm] [ppm] limit limit [Pa] [Pa] KC 18 Natural gas G20 KR 12 4,40 ±...
3. Testing the boiler WARNING The information in this section of the manual is for qualified personnel only. The user is not authorised to carry out such operations. Preliminary checks Before testing the boiler, it is recommended to check the following: •...
4. Maintenance WARNING The information in this section of the manual is for qualified personnel only. The user is not authorised to carry out such operations. WARNING Any maintenance (and repair) work must only be carried out by qualified personnel. WARNING A proper boiler routine maintenance is an essential requirement to ensure safety.
WARNING Should the device not operate correctly, while not posing danger to people, animals or property, or should you find any discrepancy with reference to prevailing standards and regulations, notify the system supervisor both verbally and in writing. WARNING The manufacturer shall not be held responsible for damage to people, animals, or property due to tampering with or im- proper intervention to the boiler or failed/insufficient maintenance.
5. Decommissioning, disassembly and disposal WARNING Gas boilers are electrical and electronic equipment (EEE) and when decommissioned they become waste electrical and electronic equipment (WEEE), therefore, they must be disposed of in compliance with the legislation in force in the coun- try of installation.
6. Malfunctions, possible causes and solutions Troubleshooting BOILER STA- MALFUNCTION PROBABLE CAUSE User's tasks Qualified personnel's tasks Check gas supply. Gas supply failure. Check gas supply cock opening or gas network safety valve intervention. Gas valve is disconnect- Burner does not ignite. Contact qualified personnel Reconnect it.
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BOILER STA- MALFUNCTION PROBABLE CAUSE User's tasks Qualified personnel's tasks Fill the system (see section Boiler shut-down). The system has been If the error occurs again several times, contact a qualified recently bled. Service Centre or qualified personnel. CH system water pres- The system is leaking.
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BOILER STA- MALFUNCTION PROBABLE CAUSE User's tasks Qualified personnel's tasks Boiler flow temperature Contact qualified personnel Check curve parameters. not properly set. Thermostat is discon- Contact qualified personnel Reconnect it. nected. Triggering of boiler E35** low-temperature safety Thermostat is faulty. Contact qualified personnel Replace it.
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BOILER STA- MALFUNCTION PROBABLE CAUSE User's tasks Qualified personnel's tasks Presence of a remote Check parameters P61, E43** Input configuration error. control instead of a room Contact qualified personnel P77 and P89. thermostat. Probe is disconnected. Contact qualified personnel Reconnect it. The ambient probe does E44** not work.
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BOILER STA- MALFUNCTION PROBABLE CAUSE User's tasks Qualified personnel's tasks Fan disconnected. Contact qualified personnel Check the fan. E158* APS_LOCKOUT Faulty boiler board. Contact qualified personnel Replace the board. MAX_TRIALS_LOCK- E160* See indications for E01. See indications for E01. See indications for E01. Water does not circulate Contact qualified personnel Check system status.
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Fax +39 0365 878 304 e-mail: info@fondital.it www.fondital.com The manufacturer reserves the right to modify his/her products as deemed necessary, without altering the basic characteristics of the products themselves. Uff. Pubblicità Fondital IST 03 C 1722 - 01 | Luglio 2024 (07/2024)
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