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Domestic water supply characteristics

The cold water inlet pressure must be lower than 6 Bar.

Besides, for an optimal boiler functioning, wa-

ter pressure

should be more than 1 Bar

. A lower pressure could make difficult to restore correctly the

pressure the heating system, and reduce the flow of hot water available from the boiler.

In case of higher pressure

it is indispensable to install a PRESSURE REDUCER

upstream the

boiler .

The cleaning frequency of the DHW heat exchanger depends on the water supply hardness.

If the wa-

ter hardness is more than 25° fr it’s required to install a softener to bring the hardness below that value.
Besides, the presence of solid residuals or impurities in the water (for example in case of new systems)

could compromise the correct functioning of the boiler. For DHW production systems, the regulation in

force prescribes a safety filter to protect the systems.

Protection against freezing

Thanks to its antifreeze system, inner components could never reach a temperature lower than 5°C. This

system is activated when the boiler is supplied by the electrical and gas lines, provided that the pressure

in the heating system is correct.

In case of boiler installation in rooms where temperature can drop down to 0°, it is advisable

to fill the heating circuit with an antifreeze liquid specific for heating systems, propylenic glycol

based, following the instructions of its manufacturer. Pay attention to the correct product con-

centration: adding those substances to the heating water in incorrect dose could lead to the

deformation of the seals and cause unusual noises during operation.

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.

Positioning and fastening

This type B boiler, with open chamber and natural draught, is not suitable for outdoor installa-

tion, neither in a partially protected place.

Содержание CITY BASIC

Страница 1: ...CITY BASIC Instruction Handbook for use adjustment maintenance installation 24 C ...

Страница 2: ...aller 12 Dimensions and connections 13 Pump capacity diagram 13 Specifications for inlet air 13 Domestic water supply characteristics 14 Protection against freezing 14 Positioning and fastening 14 Hydraulic system DHW and heating 16 Advices and suggestions to avoid vibrations and noises in the system 16 Cleaning and preservation of the systems 16 Heating system 16 Heating system filling and pressu...

Страница 3: ...ibility for any damage arising from wrong installation wrong use and non observance of current laws and instructions given by the manufacturer himself f f Important this gas boiler is used to heat the water at a temperature lower than the boiling one at atmospheric pressure it must be connected to an heating system and or to a domestic hot water system in accordance with its features and power f f...

Страница 4: ...Personnel in charge of installation Place here all necessary advices according to national rules about WORK SAFETY of Personnel in charge of installation An example follows Law number 192 of 19 August 2005 and further revisions Title of the law or brief description Always proceed with caution when handling the boiler and carrying out installation mainte nance work as metal parts may cause injuries...

Страница 5: ...d also when the gas boiler is located inside a closed space with suitable characteristics The User must not touch sealed items nor break the seals Only specialized technicians and the official technical service can break the seals of sealed items The boiler is fitted with a safety flue flow detection device that should never be bypassed or put out of order If the pressure switch must be replaced u...

Страница 6: ...sion must be car ried out by qualified technicians in accordance with the Norms and Laws in force Maintenance operations must be carried out in compliance with the manufacturer prescriptions and in compliance with the laws and rules presently in force for what is not mentioned in this handbook we advice to perform them at least once a year to maintain the boiler s performance Appliance booklet or ...

Страница 7: ...arms boiler block on page 30 4 service Indication on the display for the Technician usually not displayed 5 2 digit number on the display Normally it indicates in C the temperature of the water going out of the boiler heat ing or domestic During the adjustment of the heating system temperature rotating the knob 12 along the scale or domestic hot water rotating the knob 13 along the scale it shows ...

Страница 8: ...h use is reserved to the technician Do not turn the knob 13 on these positions 16 Commands on the lower side 17 System pressure gauge 18 System filling and pressure restoring cock 19 GAS cock Commands outside the boiler Externally the boiler suitably positioned in the building generally by the installer or by the electrician two devices that the user should access to are present The presence and t...

Страница 9: ...eat is sent by means of the system vector liquid to the heating elements of the building If in the mean time a Domestic Hot Water request takes place this latter has the priority for the whole request time Since the DHW requests are usually limited in time they generally don t have any effect on the room heating Temperature adjustment Note correct adjustment leads to creating the conditions for en...

Страница 10: ...used by the incorrect wrong or unreasonable use of not original materials The burner doesn t turn on f f if the room thermostat or programmable room thermostat or similar is installed check that it is really requiring the room heating f f check that the electrical power supply is present and that the Summer Winter knob isn t posi tioned on stand by but on Summer or Winter The GREEN light should be...

Страница 11: ...cep tional cases of mechanical lock due to the inactivity in presence of water and scale The anti locking function can t work in Safety shut off mode because of the lack of electrical supply Before re igniting the boiler have a technician check that the pump is not blocked due to inac tivity for the technician unscrew the plug in the centre of the cap to access the rotor shaft and turn it with a s...

Страница 12: ...tion does not protect the sanitary circuit outside the boiler and especially in areas where the heating system doesn t reach For this reason we recommend that you empty the cold and hot sanitary water from the parts of the system that are at risk of freezing Installation Law and regulation prescriptions for the installer Note for the translator writer Place in this paragraph all the recommendation...

Страница 13: ...ing kit upper view front view hydraulic connections on the boiler left side view hydraulic connec tions on the boiler Pump capacity diagram 0 1 2 3 4 5 6 0 200 400 1000 1200 600 800 1400 00023 A 00 pressure m H 2 O water flow l h speed 3 of the pump speed 2 of the pump City Basic 24 C The graph is referred to the capacity available to the system Specifications for inlet air Air must be withdrawn f...

Страница 14: ...e systems Protection against freezing Thanks to its antifreeze system inner components could never reach a temperature lower than 5 C This system is activated when the boiler is supplied by the electrical and gas lines provided that the pressure in the heating system is correct In case of boiler installation in rooms where temperature can drop down to 0 it is advisable to fill the heating circuit ...

Страница 15: ...ted in the figure A for the plugs and B for the open hooks f f Fix up the connections and all ducts for heating flow and return cold water hot water gas and electrical cables predisposing them in the holes of the metal jig or respecting the measures in the paragraph Di mensions and connections on page 13 The upper edge of boiler s body is represented by the dotted line C in the figure f f Remove t...

Страница 16: ...al like welding drops slag hemp mastic mud rust and other dirt from pipes and radiators Otherwise these substances could enter the boiler and damage the internal compo nents pump etc f f In case of old or very dirty systems to wash them use specific proven efficiency products in the suitable quantity and following the instructions of its manufacturer f f If the water on boiler inlet is harder than...

Страница 17: ...nsequent gas leaks Using LPG it is absolutely necessary to install a pressure reducer upstream the boiler Failure to do this the gas valve of the boiler will get damaged The gas connection as generally the boiler installation must be done by qualified personnel as prescribed by the regulation in force because a faulty gas connection could lead to fire explosion and other very serious damages to pe...

Страница 18: ...stall the new cable proceeding in the reverse way When connecting the cable to the boiler it s mandatory to leave the Earth wire about 2 cm longer than the other Live and Neutral wires to lock the cable upstream the terminals by means of the suitable fastening device Electrical safety of the appliance is only achieved when it is well connected to an efficient earth ing system executed as indicated...

Страница 19: ...xication permanent damage and death If the flue thermostat must be replaced use the original spare part only In case of repeated interventions of the device and consequent boiler locks check that the air supply room ventilation system and the Flue Products Outlet System are efficient and made according to the laws in force After whatever servicing of the flue thermostat perform a functional test o...

Страница 20: ...un angolo rientranza parete dell edificio H 300 500 600 I terminali sotto un balcone praticabile devono essere collocati in posizione tale che il percorso dei fumi dal punto di uscita del terminale al loro sbocco dal perimetro esterno del balcone compresa l altezza dell eventuale parapetto di protezione se chiusa non sia minore di 2000 mm Per una corretta computazione del percorso dei fumi vedere ...

Страница 21: ...21 Notes ...

Страница 22: ...cribed For information purposes only we explain that further to a request of domestic hot water this position activates the gas boiler at the minimum output set for this function First starting up All boilers are tested and factory set during manufacture however it is advisable during the first start ing up to perform the following checks and only if necessary the adjustments that could be necessa...

Страница 23: ...at must always be closed 2 Activate the boiler to its maximum output not modulated using the Chimney sweeper function Proceed as follows supply the boiler and turn the Summer Winter knob to Summer position provide that Room Thermostat contact is closed activated or open an hot water tap the heat produced by the boiler will be drained consequently turn the Hot Water knob to the position Chimney swe...

Страница 24: ...ition Max heating power adjustment The maximum heating power output must be set in accordance with the system requirements stated in the project Once you know the power suitable for the heating system refer to the Burner pressure tables on page 26 and find the burner pressure for the boiler model and for the type of gas used The adjustment will be performed through the boiler s controls following ...

Страница 25: ...mer Winter knob for about 30 seconds until the number on the dis play stops flashing also the green indicator stops flashing and stays on During this time check that the pressure displayed on the manometer remains stabilized on the correct value If further pressure adjustment should be needed turn the knob and wait again 30 seconds and the end of flashing to confirm and save the setting turn the H...

Страница 26: ... 31 9 325 MAX 23 0 19780 99 12 3 125 27 5 281 35 0 357 Soft ignition Soft ignition pressure is automatic and it needs no adjustment The ignition is achieved by means of a burst of electrical sparks while the burner is supplied with gas initially to the MIN pressure set on the valve gas then pressure increases gradually soft igni tion ramp until the ignition takes place The flame is detected by the...

Страница 27: ...he factory setting depends on the gas type arranged in factory for the boiler To change the type of gas supply it is necessary to follow the complete instructions described in the paragraph Gas conversion on page 28 SW2 OFF In City Basic Boilers it must be OFF Factory setting SW3 It determines the delay of 3 minutes before the new ignition of the burner after the over coming of the heating set tem...

Страница 28: ...that the gas flow is sufficient to guarantee the appliance correct work 4 Remove the pipe between the gas valve and the injectors bar 5 Remove injectors bar and replace the nozzles with the ones suitable for the available gas type using a 7 mm spanner see figure The nozzles number and diameter is stated in the table Technical data on page 34 6 Reassemble injectors bar and pipe replacing gaskets Ch...

Страница 29: ...out 5 seconds that the display shows SE SErvice flashing moreover GREEN lamp flashes with short pulses when the display shows SE flashing turn the Hot Water knob on the scale The indica tion service appears on the display and the burner ignites at the maximum output not modulated the YELLOW light turns on f f make the checks and measurements f f switch off the burner by turning the Summer Winter k...

Страница 30: ...signals are listed their most probable causes and the suggested solutions Each alarm code is complete of the status of the RED light indicator on blinking flashing with pulses off Some alarms are signalled with a combination of two or more lights in this case the light colours are explicitly reported close to the relevant status Operations accompanied by the symbol are always reserved to the Techn...

Страница 31: ...y pieces of furniture against the wall or by other objects It is however normal that the outlet is realized behind a radiator The outlet must be of the dimension prescribed by the law and must be cleaned inside some types have an anti insects net which could have been dirtied by dust or by spider webs Call a Qualified Technician when it is necessary Interferences with air supply room ventilation I...

Страница 32: ...he electric diagram page 37 and check the integrity of the wirings especially the eventual short cable jumpers between two contacts of the same connector on the cabling connections to the electronic board 35 RED YELLOW Unexpected flame the control elec tronic has detected the flame on the burner when this one should be off Wait for the boiler automatic reset 5 minutes or reset it manually by turni...

Страница 33: ...r pre scriptions and with the laws and rules presently in force for the parts not mentioned in this handbook Natural draught C models must be subjected to maintenance at least once a year A careful servicing is always a guarantee of safety and energy saving Normally it will be necessary to execute the following operations f f Remove any possible oxidization from burners and electrodes f f Remove t...

Страница 34: ...tion in force Technical data TECHNICAL DATA U M City Basic 24 C Gas type G20 G30 G31 CE certification 0694 CM 3400 Class II2H3 Type B11 BS Max heat input kW 25 7 25 7 Min heat input kW 9 9 9 9 Max heat output kW 23 1 23 1 Min heat output kW 8 6 8 6 NOX Class 2 1 1 CO at 0 O2 Qn ppm 54 4 124 60 3 CO2 at nominal input 4 3 5 4 5 0 Flue temperature Qn C 101 101 101 Flue mass flow rate Qn kg h 86 6 79 ...

Страница 35: ...ption W 110 Level of protection IP X4D DIMENSIONS Width Height Depth mm see Dimensions and connections on page 13 Weight kg 29 CONNECTIONS Hydraulic and gas connections see Dimensions and connections on page 13 Flue types lengths and diameters see Chimney connections on page 18 GAS SUPPLY PRESSURE Nominal pressure mbar 20 29 37 Inlet pressure min max mbar 17 25 28 30 G30 35 40 G31 Injectors number...

Страница 36: ...l 5 Ignition electrode 6 DHW temperature sensor 7 Flame sense electrode 8 Electronic igniter 9 Automatic venting device incorporated in the pump 10 Safety valve 3 bar 11 Gas valve 12 System pressure gauge 13 Priority flow switch with filter 14 Filling valve 15 Drain valve 16 Loss of water pressure switch 17 Pump 18 Heating circuit temperature sensor 19 Burner 20 Bithermic exchanger ...

Страница 37: ...ve modulation control 11 2 Gas valve opening control 13 Priority flow switch 16 Loss of water pressure switch 17 Pump 18 Heating circuit temperature sensor 25 Display board 27 Fuse F2A 2A fast Optional external devices 28 Room thermostat Voltage free Contact for Room Thermostat or Chronothermostat for trade working at safety extra low voltage SELV Closed contact heating request Remote control Term...

Страница 38: ... 16 14 R M C F G 1 Flue thermostat 2 Flue hood 3 Safety thermostat for max water temperature 4 Expansion vessel 6 DHW temperature sensor 10 Safety valve 3 bar 11 Gas valve 13 Priority flow switch with filter 14 Filling valve 16 Loss of water pressure switch 17 Pump 18 Heating circuit temperature sensor 19 Burner 20 Bithermic exchanger 29 By pass automatic R Heating return M Heating flow C Hot wate...

Страница 39: ...ontrol cable coming out of the boiler by means of a suitable bipolar terminal See also Electrical diagram on page 37 Note The Remote Control link is not polarized 4 power supply the boiler turn the boiler s Summer Winter knob on Summer otherwise the Remote Control doesn t work and the boiler goes into alarm 31 described below 5 check the correct work of the device The electronics should recognize ...

Страница 40: ...960000001_08_ENG 05 03 2015 ITALTHERM Srl declines any responsibility for eventual printing and or transcription errors in the present manual In order to constantly improve its products the company has the right to change features and data written in the present manual at any time and without notice www italtherm it UNI EN ISO 9001 2008 ...

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