Table of Contents
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Summary of Contents for Italtherm 25 K
- Page 1 Handbook installation adjustment maintenance CITY CLASS 25 k 30 k 35 k Green Heating Technology IMPORTANT! Install the gasket includ- ed in the documents bag, on the intake/ outlet flange, as shown on page 21.
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Page 2: Table Of Contents
Table of Content Safety warnings 3 Condense drain � � � � � � � � � � � � � � � � � � � � � � � � � 18 Heating system filling and pressuring � � � � � � � 18 Safety warnings symbols legend ... -
Page 3: Safety Warnings
Safety warnings This instructions manual is an essential and complementary part of the product and it is supplied to- gether with the boiler� Carefully read the manual, achieving all important information for a safe installation, use and servicing� f Carefully keep the manual, together with the documentation of all the accessories of the boiler and of the system, for any further consultation you may need. -
Page 4: Safety Warnings Symbols Legend
Safety warnings symbols legend Generic safety Electrical danger Physical danger warning (fulguration) (personal damage) Thermal danger General warning or advice to avoid material damage (burns) or to achieve improvements References to Laws and Norms All references to laws and laws contained in this handbook, as well as all installation, maintenance and use prescriptions and the relevant pictures, are relevant to European and/or Italian regulation. -
Page 5: User Warnings
First starting up and Use The first starting up and the maintenance of the boiler must be performed by a professionally qualified staff (for example the installer or the Service Centres authorized by ITALTHERM) The latter will check that: f the label technical data of the gas boiler correspond to those of the gas available;... -
Page 6: Installation, First Starting Up, Maintenance And Servicing
f Do not expose the wall hung gas boiler to water or other liquids sprinklings, or to vapours directly coming from gas cookers/hobs� f Do not obstruct the air intake or flue outlet terminals, even momentarily or partially. f Do not put any object on the gas boiler and don't leave any flammable liquid or solid materials, (e.g. paper, clothes, plastic, polystyrene) in its proximity. -
Page 7: User Guide
User guide The front control panel Pushbuttons Stand-by / Functioning mode At every press, the boiler switches its mode from to summer or winter mode� CH setting To set the CH system temperature. If the Outdoor Sensor Kit was in- stalled, see also "Outdoor Sensor Kit"... -
Page 8: Commands On The Lower Side
Three digit display under the symbol Normally, it displays the temperature of the hot water on boiler's outlet. When the boiler is in stand-by mode, it displays During the DHW temperature setting (by pressing the buttons ), it shows the temperature value changing; in case of alarm it displays the ID number of the alarm (see "Alarms - boiler block"... -
Page 9: Typical Use
Typical use Preliminary operations f Be sure the gas cock 3 is opened� f Be sure the boiler is electrically powered and set in OFF: only has to be displayed on the screen� f Make sure, by the gauge 1 that the cold-system temperature is always within 0.5 and 1.5 Bar (opti- mal: 1÷1.5 Bar). -
Page 10: Incidental Malfunctioning
"User Guide" section and expressly allowed to the User. Always address yourselves to qualified personnel. Boilers must be always equipped with original accessories only. ITALTHERM Srl is not responsible for damages caused by the incorrect, wrong or unreasonable use of not original materials. The burner doesn’t turn on f if the room thermostat (or programmable room thermostat, or similar) is installed, check that it is really requiring the room heating;... -
Page 11: Boiler Inactivity
Boiler inactivity The effects of the periods of inactivity can be relevant in particular situations such as in flats used only for some months per year, most of all in cold places. The user will have to decide to put the boiler in the SAFETY SHUT OFF state disconnecting all the sup- plies, or to leave it on OFF mode (but electrically supplied) in order to let the Anti Frost Function work�... -
Page 12: Ambient Anti-Frost" Function
) the burner won’t turn on. Nevertheless, any time it is possible, the pump will work, making the water circulate in the system and reducing in this way the possibility of freezing. ATTENTION: the anti-frost protections cannot intervene in the absence of electricity. If you an- ticipate this possibility, we recommend you add a good brand of anti-freeze to the heating sys- tem, following the producer’s instructions. -
Page 13: Dimensions And Connections
Dimensions and connections 23÷43 23÷43 front view - hydraulic connections front view - left side view - on the wall hydraulic connections hydraulic connec- (with optional fitting kit) on the boiler tions on the boiler see also page 16 TA / L M G R Legend: 1 Flue outlet... -
Page 14: Warnings For The Installation Of Optional Kits
00362 B 01 The graph is referred to the capacity available to the system. mod. 30K speed 3 - 2 of the pump 1000 1200 1400 1600 water flow (l/h) 00362 C 01 The graph is referred to the capacity available to the system. -
Page 15: Domestic Water Supply Characteristics
ITALTHERM S.r.l. will not be held responsible for consequent damages. Instruct the User about the antifreeze function of the boiler and about the antifreeze product added in the heating system. -
Page 16: Positioning And Fastening
32.5 32.5 Positioning and fastening Heating Remark: A re-usable metal jig ( D in the figure) can be ordered separately, Flow (3/4”) so as to facilitate connections and fixing points positioning (when the Hot Water original connection kit is used). If the metal jig and/or the original Outlet (1/2”) connection kit are not used, refer to the paragraph "Dimensions and connections"... -
Page 17: Hydraulic System (Dhw And Heating)
(consider that 1 mm of limestone incrustations reduces of 18% the thermal exchange of the heating element on which it has been formed). ITALTHERM guarantees its products only if the characteristics of the water comply with UNI 8065, re- ported also in laws on energy saving�... -
Page 18: Condense Drain
Condense drain Insert the flexible pipe of condense outlet inside the outlet funnel (or other inspectable connection de- vice) properly installed for this purpose, or in the outlet funnel of the safety valve, in case of the above mentioned outlet is able to receive the acid liquids of the condense as foreseen by the norms in force in matter of condensing boilers. -
Page 19: Gas Connection
Gas connection Due to various installation possibilities, the gas cock 3 supplied with the original Connections Kit has a simple male Ø ½” connection, facing the rear of the boiler. The gas pipe 4, upstream the gas cock 3, should be supplied by the installer. -
Page 20: Electrical Connections
ITALTHERM S.r.l. declines any responsibility for damages to persons, animals or things caused by the faulty or missing connection of the boiler earthing and by failure to comply with the rules. -
Page 21: Flue Systems
Flue systems DON'T intake for use! split system Intake/outlet flange The boiler is equipped with a flange for connecting inlet and outlet flues pipes; this flange has been studied for collecting rain/water that may creep into the inlet pipe and for avoid- ing that rain reaches the burner’s fan. - Page 22 If it is possible, we recommend to foresee (referring to the direction of the air/flue, see examples on page 23) an upwards slope for all the intake and outlet ducts, in order to: f PREVENT the water or dust or other objects entrance inside the INTAKE duct. In case of coaxial ducts, use the special horizontal terminal, which is especially built to respect these slopes only for the first length of the intake duct;...
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Page 23: Examples Of Installation Of Intake And Outlet
Examples of installation of intake and outlet ducts We give you some correct and wrong examples of installation of intake and outlet ducts for condensing boilers (the slope are voluntarily represented in an exaggerated way). A = Intake; S = Outlet. 1: the most functional and economic solution is to let the condense come back towards the boiler**�... -
Page 24: Dimensioning The Intake And Outlet Ducts
Dimensioning the intake and outlet ducts In the following table, all the characteristic losses of load of the original fume venting accessories, ex- pressed as equivalence in meters (m) are listed. If additional, original flue accessories, aside from the ones pictured, are used, the total system length should be calculated considering the sum of the equivalent characteristic losses of load, expressed in meters in the following table�... -
Page 25: Flue System Types
Mod� Example of split pipe AS+SC min÷max (m) SC max (m) system (C 25 K 1 ÷ 52 30 K 1 ÷ 52 35 K 1 ÷ 52 Original*** split pipe system Ø60mm 25 K 1 ÷ 16 30 K 1 ÷... -
Page 26: Allowed Flue Types
Allowed flue types max 0,5 m B23P B53P The flue duct and its connection to the chim- Separated outlet and inlet, in shared chim- ney should be made in compliance to Na- neys subjected to similar wind conditions tional and Local Regulation in force. – It's (natural draught chimney). -
Page 27: Adjustment And Maintenance
Adjustment and Maintenance WARNING: Hereby described operation can be performed by qualified technicians only. When regulation/measuring is over, remember to verify the absent of gas leakages. Do not use free flames to detect gas leakages The gas valve, exception the PIN plug and the upwards connections, works in NEGATIVE PRES- SURE. -
Page 28: Maintenance Operations
f verify the presence of the permanent air/ventilation outlets, correctly dimensioned and working, as foreseen by the National and Local laws depending on the appliances installed; f verify that the evacuation flue duct corresponds to the National and Local laws and that is in good and efficient conditions;... -
Page 29: Access To The Inside Of The Boiler
f verify that the passage of the air burning and the evacuations of the flues and of the condense will be made correctly according to National and Local laws in force; f verify the correct functioning of the system of the outlet condense, also in the external parts of the boilers, i.e. -
Page 30: Venting The Primary Exchanger
Venting the primary exchanger When commissioning the boiler, we recommend to check that there is no air in the primary circuit of the combustion unit. Do this operation also during the combustion unit cleaning, if you hear the typical air bubble noise. f Locate the combustion unit manual venting valve (item 8 in the following picture) and, to avoid wet- ting the boiler inside, insert a length of flexible hose, with suitable diameter, on its fitting, then direct the other end towards a drain (or a container to collect the anti-freeze solution);... -
Page 31: Pcb Parameters Settings (Technician Menu)
f unscrew, following the stamped sequence, the four nuts 1 which fix the burner group 12 (composed of fan, hose and burner) to the primary exchanger. Remove the burner group; Do not disassemble the burner group and do not dismount the ceramic fibre plate from the bot- tom of the exchanger�... -
Page 32: Main Boiler Parameters (Pc)
Main boiler parameters (PC) The parameters listed in the following table are limited to those described in this handbook� The com- plete parameter list is available in the documentation for the technician. Param- Adj. range Description (fact. set.) eter and values 0…2 (0) Type of GAS supply for Natural Gas (G20) supply... - Page 33 Param- Adj. range Description (fact. set.) eter and values 0…3 (0) Auxiliary maintenance functions Disabled - normal operation of the boiler (Remember to set this value to 0 at the end of work) function Bleeding on heating side - boiler puts 3-way valve on the heating side and pump is continuously powered function Bleeding on DHW side - boiler puts 3-way valve on the DHW side and pump is continuously powered...
- Page 34 Param- Adj. range Description (fact. set.) eter and values 0; 5…120 Enabling of Safety Thermostat on floor plant (on AUX input - see also param- eter 46) and delay of its operating Remark: avoid selecting values outside of the range described and correct if necessary. Disabled - the component is not connected to AUX input 5…120 Minutes of delay between the thermostat activation (open contact) and...
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Page 35: Combustion Test
Combustion test if burner and exchanger cleaning is foreseen, carry it out before testing the combustion (see "Combustion group cleaning and check" on page 30. To perform the test you need a flue analyser, correctly calibrated (in the condensing boil- er, the precision and the correctness of the measures is particularly important). -
Page 36: Power Adjustment Tables
if one or more CO values was outside allowed ranges, carry out the MANUal combustion calibra- tion (see "Combustion calibration" on page 37); • if the manual calibration doesn't allow to adjust the CO to normal values, carry out an AUTO- matic calibration (remove the analyser during this operation) and then do a manual calibration again, measuring and adjusting the CO . -
Page 37: Max Heating Power Adjustment
Max heating power adjustment The maximum heating power output must be set in accordance with the system requirements (stated in the project) by using the parameter 04 (see page 32) with reference to the "Power adjustment tables" on page 36. The boiler is factory preset with a standard value, highlighted in the relevant table. Get information about the maximum heating power requirement of the heating system (reported on the project documentation of the system itself);... -
Page 38: Accessing The Main Board
31170 City Class 25 K codes 30270 31270 City Class 30 K 30370 31370 City Class 35 K (1) Factory preset; code written on the sticker on the electronic box (2) Code that will appear on the display (for some seconds at the moment of the electrical supply) if the Parameter 01 has been changed because of gas conversion. -
Page 39: Gas Conversion
Gas conversion ATTENTION: the operations described below must be carried out only by qualified personnel. This boiler is designed and prepared to be supplied with Natural Gas G20 (Methane). It can be set, just by means of electronic settings, but always by a qualified technician, to operate with Commercial Propane G31, for which it is absolutely necessary to install a pressure reducer upstream the boiler. -
Page 40: Draining The Heating System
Draining the heating system When it is necessary to drain the heating system, proceed as described here below: f Connect a rubber pipe to the draining tap terminal 1 ; f put the other end of the pipe in a suitable drain or sink; f open the draining tap by turning the nut 2 counter- clockwise, using a suitable spanner;... -
Page 41: Alarms - Boiler Block
Alarms - boiler block Following a malfunction, the boiler can lockout and show a particular signal, the display, with an alarm code "E…". In the following table, all the alarm signals are listed, their most probable causes and the suggested solutions. Generally: •... - Page 42 Signal Probable causes Suggested solutions the boiler has over- Restore the boiler function by using the button. If necessary, heated wait at least 20-30 minutes (to make the boiler cool) and try again. Safety Thermostat If the lockout persists or reappears, call the Service Centre. has triggered Verify the safety thermostat functionality.
- Page 43 Signal Probable causes Suggested solutions Failure to the heat- Check the cabling of the system return temperature probe. ing system return Replacement of the system return temperature probe. temperature probe. Fan failure. User: Try a boiler reset by using the button.
- Page 44 Signal Probable causes Suggested solutions Remote control* User: Disconnect the electrical supply to the boiler for at least 30 not working seconds, by operating the suitable external bipolar switch, then connect it again and ensure that the Summer mode is selected by Data exchanged between using the button .
- Page 45 Signal Probable causes Suggested solutions System error Detect the fault or anomaly also referring to the technical literature reserved to the service centres� Anomaly of inner boiler device(s) Mains electrical power supply out of tolerance limits Over-temperature The water that returns to the boiler from the heating system is too of water on system hot: this may be an effect of a malfunction of the system, and any- return...
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Page 46: Warnings For Servicing
Clean casing with soapy water only. Do not clean casing, other painted or plastic surfaces with thin- ner� f In any case of parts replacement, it is mandatory to use ITALTHERM original spare parts. ITALTHERM declines any responsibility in case of non-original spare parts utilization. -
Page 47: Technical Data
Technical data TECHNICAL DATA City Class 25 K City Class 30 K City Class 35 K U.M. Gas type Class 2H3P 2H3P 2H3P B23 - B23P - B53 - B53P - C13 - C33 - C43 - C53 - Type... - Page 48 TECHNICAL DATA (cont'd) City Class 25 K City Class 30 K City Class 35 K U.M. Gas type 0.4 / 0.9 0.4 / 0.9 0.4 / 0.9 (±0.2) (±0.2) (±0.2) Loss of water pressure switch To allow the correct system filling, the pressure of the domestic water should be off / on pressure higher than the ON value of the pressure switch.
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Page 49: Boiler Internal Components
Boiler internal components Flue connection flange 17 DHW temperature sensor Plug for Combustion analysis (air intake) 18 System pressure gauge Plug for Combustion analysis (flue) 19 Filling valve Expansion Vessel 20 By-pass (in-built in the 3-way valve hydraulic assembly) Water drain pipe from air intake flange 21 DHW exchanger 22 Motorized 3-way valve Air/Gas Mixing device... -
Page 50: Electrical Diagram
Electrical diagram 30 25 6.1 Fan - supply Optional external devices: 6.2 Fan - speed control TA Room thermostat: (or Chronothermostat) SELV simple contact. Closed contact = heating request. Temperature Sensor on system return Remote control (original accessory only) 11 Pump SE To optional outdoor temperature sensor 14 Priority flow switch (with filter) (*) TA2 To optional room thermostat for zones with... -
Page 51: Hydraulic Diagram
Hydraulic diagram 24 Manual Venting Device (Combustion Flue connection flange assembly) Expansion Vessel 25 Temperature Sensor, system flow Water drain pipe from air intake flange 26 Safety thermostat on system flow 27 Air intake hose Air/Gas Mixing device 51 Flue hood Temperature Sensor on system return 52 Combustion chamber Automatic Venting Device... -
Page 52: Addendum
Addendum Outdoor Sensor Kit Installation and setting The Outdoor Sensor manages automatically the CH flow temperature** as a function of the outdoor temperature, thus avoiding the user to adjust it manually. This function is also named "shifting tempera- ture"� that's the temperature of the heating elements. Don't mistake it with the room temperature (managed by the room thermo- stat or by the Remote Control, but not by the boiler) that doesn't depend on the first one. -
Page 53: Remote Control Kit
Remote Control Kit This remote control is more than a simple room thermo- stat. Thanks to this, it is possible to manage the boiler in all its settings like DHW and CH temperature adjustment, boiler reset in case of boiler block, and of course it works as a room thermostat both in manual and weekly program mode. - Page 54 Notes Green Heating Technology...
- Page 55 Notes Green Heating Technology...
- Page 56 Green Heating Technology www.italtherm.it ITALTHERM Srl Via S. D’Acquisto, 10 • 29010 Pontenure (PC) - IT Tel. +39.0523.575611 • Fax +39.0523.575600 UNI EN ISO www.italtherm.it • e-mail: info@italtherm.it 9001:2015...
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