Italtherm CITY TOP 25 K User manual

Green Heating Technology
CITY TOP
use
installation
adjustment
maintenance
Handbook
instruction
ENG
Green Heating Technology
25 k
35 k

Green Heating Technology
2
Table of Content
Safety warnings 3
Safety warnings symbols legend � � � � � � � � � � � � � � � 4
References to Laws and Norms � � � � � � � � � � � � � � � � 4
Personnel in charge of installaon � � � � � � � � � � � � � � � � 4
Installaon, use and maintenance � � � � � � � � � � � � � � � � 4
User warnings � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
Important � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
First starng up and Use � � � � � � � � � � � � � � � � � � � � � � � � 5
Installaon, rst starng up, maintenance and
servicing � � � � �� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
Appliance booklet or central plant booklet � � � � � � � � � 6
Combuson checking � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
Boiler operaon and servicing � �� � � � � � � � � � � � � � � � � � 6
User guide 7
The front control panel � � � � � � � � � � � � � � � � � � � � � � � 7
Commands on the lower side � � � � � � � � � � � � � � � � � 8
Commands outside the boiler � � � � � � � � � � � � � � � � � 8
Typical use � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Preliminary operaons � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Boiler acvaon � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
Temperature adjustment � � � � � � � � � � � � � � � � � � � � � � � 10
The "plus" funcon (DHW pre-heang) � � � � � � � � 10
How to set the desired "plus" level � � � � � � � � � � � � � � � 10
How to enable or disable the "plus" funcon � � � � � � 11
INFO menu � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 11
INFO for user � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 11
INFO for the technician � � � � � � � � � � � � � � � � � � � � � � � � 11
Incidental malfunconing � � � � � � � � � � � � � � � � � � � 12
The burner doesn’t turn on � � � � � � � � � � � � � � � � � � � � � 12
Shortage of domesc hot water producon � � � � � � � 12
Boiler inacvity � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12
Safety shut o � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12
Stand-by mode with an-frost & an-locking
funcon � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 13
“Ambient An-Frost” Funcon � � � � � � � � � � � � � � � � � � 14
Installaon 14
Law and regulaon prescripons for the installer
� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 14
Dimensions and connecons � � � � � � � � � � � � � � � � � 15
Pump capacity diagram � � � � � � � � � � � � � � � � � � � � � 15
Warnings for the installaon of oponal kits or
special systems � � � � � � � � � � � � � � � � � � � � � � � � � � 16
Floor heang system � � � � � � � � � � � � � � � � � � � � � � � � � � 16
Specicaons for intake air � � � � � � � � � � � � � � � � � � 16
Domesc water supply characteriscs � � � � � � � � � 16
Protecon against freezing � � � � � � � � � � � � � � � � � � 17
Outdoor installaon in a parally protected
place � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 17
Posioning and fastening � � � � � � � � � � � � � � � � � � � � 18
Hydraulic system (DHW and heang) � � � � � � � � � � 19
Advices and suggesons to avoid vibraons and
noises in the system � � � � � � � � � � � � � � � � �� � � � � � � � 19
Cleaning and preservaon of the systems � � � � � � � � � 19
Heang system � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 19
Condense drain � � � � � � � � � � � � � � � � � � � � � � � � � � � � 20
Heang system lling and pressuring � � � � � � � � � � 20
Gas connecon � � � � � � � � � � � � � � � � � � � � � � � � � � � � 21
Electrical connecons � � � � � � � � � � � � � � � � � � � � � � � 22
Flue systems � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 23
General indicaons � � � � � � � � � � � � � � � � � � � � � � � � � � � � 23
Sizing C63 systems � � � � � � � � � � � � � � � � � � � � � � � � � � � � 24
Examples of installaon of intake and outlet ducts � � 25
Sizing the ue system � � � � � � � � � � � � � � � � � � � � � � � � � � 26
Flue system length � � � � � � � � � � � � � � � � � � � � � � � � � � � � 26
How to use the tables � � � � � � � � � � � � � � � � � � � � � � 26
System length tables � � � � � � � � � � � � � � � � � � � � � � � 27
Allowed ue types � � � � � � � � � � � � � � � � � � � � � � � � � � � � 28
Adjustment and Maintenance 29
First starng up � � � � � � � � � � � � � � � � � � � � � � � � � � � � 29
Maintenance operaons � � � � � � � � � � � � � � � � � � � � 30
Access to the inside of the boiler � � � � � � � � � � � � � 31
Venng the primary exchanger � � � � � � � � � � � � � � � 32
Combuson group cleaning and check � � � � � � � � � 32
PCB parameters sengs (technician menu) � � � � � 33
Main boiler parameters (PC) � � � � � � � � � � � � � � � � � � � � 34
Combuson test � � � � � � � � � � � � � � � � � � � � � � � � � � � 37
CH Power Input adjustment tables � � � � � � � � � � � � 38
Max heang power adjustment � � � � � � � � � � � � � � 39
Combuson calibraon � � � � � � � � � � � � � � � � � � � � � 40
Accessing the main board � � � � � � � � � � � � � � � � � � � 40
Main board replacement � � � � � � � � � � � � � � � � � � � � 41
Board conguraon codes � � � � � � � � � � � � � � � � � � � � � � 41
Gas conversion � � � � � � � � � � � � � � � � � � � � � � � � � � � � 41
Draining the heang system � � � � � � � � � � � � � � � � � 42
Pump sengs � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 42
Alarms - boiler block � � � � � � � � � � � � � � � � � � � � � � � � 42
Warnings for servicing � � � � � � � � � � � � � � � � � � � � � � 49
ErP Data - EU 813/2013 � � � � � � � � � � � � � � � � � � � � � 50
Product che - EU 811/2013 � � � � � � � � � � � � � � � � � 50
Technical data � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 51
Boiler internal components � � � � � � � � � � � � � � � � � � 53
Electrical diagram � � � � � � � � � � � � � � � � � � � � � � � � � � 54
Hydraulic diagram � � � � � � � � � � � � � � � � � � � � � � � � � � 55
Addendum 56
Outdoor Sensor Kit � � � � � � � � � � � � � � � � � � � � � � � � � 56
Installaon and seng � � � � � � � � � � � � � � � � � � � � � � � � � 56
Outdoor Sensor kit and Remote Control � � � � � � � � � � 56
Remote Control Kit � � � � � � � � � � � � � � � � � � � � � � � � � 57
Appliance disposal � � � � � � � � � � � � � � � � � � � � � � � � � 57
Modulang circulang pump - details � � � � � � � � � 58
Status indicator � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 58
Circulang pump rotor unlocking � �� � � � � � � � � � � � � � 58

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Safety warnings
This instrucons manual is an essenal and complementary part of the product and it is supplied to-
gether with the boiler�
Carefully read the manual, achieving all important informaon for a safe installaon, use and
servicing�
fCarefully keep the manual, together with the documentaon of all the accessories of the boiler and
of the system, for any further consultaon you may need.
fThe installaon must be carried out by a qualied technician, in accordance with manufacturer in-
strucons and with the relevant requirements of the current issue.
fCarbon monoxide (CO) danger: the CO is a no-smelling and no-colour gas. When a forced draught
boiler with air intake from the room (appliance type B2) is installed, permanent venlaon of the
installaon room is mandatory and extremely important. Venlaon must be made and sized in
compliance with Laws and Rules in force. Whatever manumission, closing or neutralizaon of the
permanent venlaon could lead to very serious consequences to people in the rooms, as intoxica-
on by CO, permanent damage and death. Besides, the CO and O2mix can be explosive�
fA qualied technician is a person with a specic technical competence in the eld of the heang
appliances for domesc use and domesc hot water producon, in compliance with Laws and Rules
in force�
fThe operaons that the user can do are only and exclusively the ones contained in the "USER GUIDE"
secon.
fThe manufacturer has no contractual and extra-contractual responsibility for any damage arising
from wrong installaon, wrong use and non-observance of current laws and instrucons given by
the manufacturer himself.
fImportant: 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 heang system and/or to a domesc hot water
system, in accordance with its features and power.
fPacking items (cartons, nails, plasc bags and so on) must not be le within children easy reach, as
they are potenally dangerous.
fBefore any cleaning or servicing operaon, disconnect the boiler from the mains electrical supply by
means of the main electrical switch and stop the gas supply by means of the suitable cock.
fIn case of fault and/or bad operaon of the appliance, disconnect it immediately and do not try to
repair it by yourselves.
fBoiler servicing and repair must be carried out exclusively by qualied technicians, which will use
original spare parts. Strictly observe the above requirement, avoiding any risk of compromising the
appliance safety�
fIf the appliance should be denively dismissed, remove or cut o any potenal dangerous item.
Dispose of it according to the regulaons in force (page 57).
fWhen transferring the appliance (e.g. leaving it installed aer a removal or a sale of the building),
make always sure that the instrucons manual is close to the boiler for the future use of new owners
and/or installers.
fThis appliance must be used for its clearly recommended ulizaon only. Any other ulizaon must
be considered dangerous and incorrect.
fIt is strictly forbidden to use the appliance for dierent purposes than the specied ones.
fThis appliance must be installed exclusively to wall�

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Safety warnings symbols legend
Generic safety
warning
Electrical danger
(fulguraon)
Physical danger
(personal damage)
Thermal danger
(burns)
General warning or advice to avoid material damage
or to achieve improvements
References to Laws and Norms
All references to laws and laws contained in this handbook, as well as all installaon, maintenance and
use prescripons and the relevant pictures, are relevant to European and/or Italian regulaon.
All laws and norms in force in the territory where the installaon takes place prevail on the indica-
ons contained in this handbook, that are inconsistent with them.
All the references to norms and naonal laws menoned in this handbook are indicave as
laws and norms are subject to issues and integraons by the authories in charge. Also comply
to eventual local norms and laws (not menoned in this handbook) in force in the territory
where the installaon takes place.
Personnel in charge of installaon
Always comply with naonal and/or local regulaon about WORK SAFETY of Personnel in
charge of installaon.
Always proceed with cauon when handling the boiler and carrying out installaon/mainte-
nance work as metal parts may cause injuries such as cuts and abrasions. Wear personal protec-
on devices (especially gloves) while doing the above menoned operaons
Installaon, use and maintenance
Always comply with naonal and/or local regulaon about BOILER INSTALLATION.

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User warnings
Important
In case of gas smell:
1 - do not press electrical switches, use the telephone or other objects that can provoke
sparks;
2 - open immediately the windows and the doors in order to cleanse the room air;
3 - close the gas supply taps;
4 - call a qualied technician.
Do not obstruct the venlaon openings of the gas boiler room, in order to avoid possible
dangerous situaons as the creaon of poisonous or explosive mixtures.
First starng up and Use
The rst starng up and the maintenance of the boiler must be performed by a professionally
qualied sta (for example the installer or the Service Centres authorized by ITALTHERM)
The laer will check that:
fthe label technical data of the gas boiler correspond to those of the gas available;
fthe main burner regulaon is compable with the gas boiler output;
fthe chimney works correctly, expelling the combuson products;
fthe air supply and the combuson products evacuaon work correctly, in accordance with the re-
quirements in force;
fthe condions for a correct venlaon are guaranteed, also when the gas boiler is located inside a
closed space (with suitable caracteriscs).
This boiler is designed and prepared to be supplied with Natural Gas G20 (Methane). It can be
set, just by means of electronic sengs, but always by a qualied technician, to operate with
Commercial Propane G31 or Air/Propane G230. It must never be used with butane gas G30
(that can be present, pure or mixed with Propane G31, in the portable gas boles for cookers).
The User must not touch sealed items nor break the seals. Only specialized technicians and the
ocial technical service can break the seals of sealed items.
The boiler is ed with safety devices that block operaon the case of problems with the boiler
or related systems. These devices must never be disabled: if a device intervenes frequently,
have a qualied technician located the cause, even in systems to which the boiler is connected,
and in the ue intake/outlet system that must be ecient and made according to the laws in
force (see examples in paragraph "Flue systems" on page 23). If a boiler component has failed,
you must only use original replacement parts
When the boiler is o for a long period see the Paragraph "Boiler inacvity" on page 12 for
the necessary precauons about the electrical supply, the gas supply and the protecon against
freezing.
Do not touch the heated surfaces of the boiler, as the doors, the ue, the chimney pipe, etc.,
also aer the boiler operaon because, for a certain me, these surfaces are overheated. Any
contact with them can cause dangerous scalds. It is then forbidden to let children or inexperi-
enced people be close to the boiler, during its operaon.

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fDo not expose the wall hung gas boiler to water or other liquids sprinklings, or to vapours directly
coming from gas cookers/hobs.
fDo not obstruct the air intake or ue outlet terminals, even momentarily or parally.
fDo not put any object on the gas boiler and don't leave any ammable liquid or solid materials, (e.g.
paper, clothes, plasc, polysrene) in its proximity.
fThis appliance is not intended for use by persons (including children) with reduced physical, sensory
or mental capabilies, or lack of experience and knowledge, unless they have been given supervi-
sion or instrucon concerning use of the appliance by a person responsible for their safety. Children
should be supervised to ensure that they do not play with the appliance.
fIf the gas boiler is going to be denively unused, call a qualied technician to carry out all required
operaons, checking in parcular disconnecon of gas, water and electrical supplies.
fOnly for those models that draw directly from the installaon room (type B appliances installed in-
door): the installaon of aspirators, replaces or similar appliances in the room where the type B ap-
pliance is installed (and in adjacent rooms in case of indirect venlaon) is prohibited except in cases
foreseen by rules in force and anyway the installaon must be made in compliance with all specic
safety measures menoned in the rules and laws in force, even in case of modicaons or addions.
Installaon, rst starng up, maintenance and servicing
All operaons for installaon, rst starng up, maintenance, servicing and gas conversion must be car-
ried out by qualied technicians, in accordance with the Norms and Laws in force.
Maintenance operaons must be carried out in compliance with the manufacturer prescripons, and in
compliance with the laws and rules presently in force for what is not menoned in this handbook; we
advice to perform them at least once a year to maintain the boiler’s performance.
Appliance booklet or central plant booklet
All appliances must have an appliance booklet (for outputs less or equal 35 kW) or a central plant book-
let (for outputs more than 35 kW). All maintenance and servicing operaons and combuson checks
must be wrien on the booklet, together with the name of the person responsible for servicing.
Combuson checking
Combuson checking consists of a control of the boiler eciency. Boilers that, aer the checking, will
have eciency rates lower than the ones required and not changeable with suitable adjustments (that
must be performed by qualied technicians), must be replaced.
Boiler operaon and servicing
The user (owner or tenant of the at where the boiler is installed) or the administrator of the block of
ats (in case of a central heang system) are responsible for the appliance operaon and servicing; they
can both transfer the responsibility of the servicing and eventually of the operaon to another person,
which must be a qualied technician as indicated by the Laws. Even if the user or the administrator de-
cide to assume personally this responsibility, ordinary servicing of the warm air heater and combuson
checks must be anyway carried out by a qualied technician

Green Heating Technology 7
User guide
The front
control
panel
00442 00
Pushbuons
Stand-by / Funconing mode
At every press, the boiler cyclically switches its mode from to summer or win-
ter + mode�
CH seng
To set the CH system temperature. If the Outdoor Sensor Kit was installed, see also "Out-
door Sensor Kit" on page 56.
DHW seng
To set the DHW temperature.
RESET Press to reset the boiler in case of breakdown�
See further details in "Alarms - boiler block" on page 42.
plus It manually sets the acvaon, inacvaon, and the level of the DHW pre-heang mode.
See "The "plus" funcon (DHW pre-heang)" on page 10 for details.
INFO It displays addional boiler informaon. See "INFO menu" on page 11 for details.
Display - symbols enabled in this model and their descripon
CH – winter mode indicaon
If ashing, it means that the boiler is funconing in CH mode. See also the remark in the
descrion of symbol .
Burner ON
It indicates the presence of the ame in the burner.
DHW mode indicaon
If ashing, it means that the boiler is funconing to produce hot water.
If both and symbols ash at the same me, a Technician-reserved funcon
has been acvated. In this case, turn immediately the boiler o - and then turn it
on again - by means of the buon �

Green Heating Technology
8
Two digit display under the symbol
Normally, it displays the CH ow temperature, i.e the temperature of the liquid on boiler's
outlet that is sent to the CH system.
During the CH temperature seng (by pressing the buons and ), it shows
the temperature value changing; in case of alarm it displays "E"; during the seng
(reserved to the Technician) it displays the chosen parameter ID number (see "PCB param-
eters sengs (technician menu)" on page 33).
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 seng (by pressing the buons and ), it shows
the temperature value changing; in case of alarm it displays the ID number of the alarm
(see "Alarms - boiler block" on page 42); during the seng (reserved to the Techni-
cian) it displays the value of the chosen parameter�
RESET It appears when the boiler is locked or anyway is present an error that the user could man-
age. See "Alarms - boiler block" on page 42 to idenfy the problem and the relevant
acons to be carried out.
SERVICE It appears when the boiler has detected an error (mainly a fault) that has to be managed
by the Technician. The User can anyway see "Alarms - boiler block" on page 42 to get
informaon about and the eventual acons to be carried out.
It informs that the outdoor probe (accessories) is installed.
Note: In this case the CH system temperature is automacally set and so the use of but-
tons and is dierent from the standard way: for deeper detailsrely on
kit instrucon and see "Outdoor Sensor Kit" on page 56.
It means the funcon is ON. It ashes when the boiler is working for that. See "The "plus"
funcon (DHW pre-heang)" on page 10 for details.
INFO It means that addional informaon about boiler work are displayed. See "INFO menu" on
page 11 for details.
Commands on the lower side
1System pressure gauge
2Screw for manual system lling
3GAS cock
Commands outside the boiler
Externally the boiler, suitably posioned in the build-
ing (generally by the installer or by the electrician), two
devices that the user should access to, are present. The
presence and the characteriscs of these devices are pre-
scribed by the regulaon in force.
Two-pole switch: it is located usually close to the boiler and it's for electrically insulang the boiler
itself from the domesc mains power supply network. It is useful to disconnect the boiler from the
electrical supply, e.g. during inacvity periods (see "Safety shut o" on page 12) or in some cases
of alarm (see "Alarms - boiler block" on page 42).
00315_00
2
3
1

Green Heating Technology 9
Room thermostat: it commands electrically the boiler to acvate or deacvate the heang system, in
order to keep the room temperature (detected by a sensor) within a value set by the user, Regula-
on in force prescribe its posioning, the temperature limits within the user can adjust it and the
periods of heang.
Remark: an oponal, original Remote Control kit is available (see "Remote Control Kit" on page 57
for informaon) or a cung-edge chronotermostat kit featuring weekly programming of various
temperature levels and other special funcons. Also wireless and GSM controlled versions are
available.
Typical use
Preliminary operaons
fBe sure the gas cock 3 is opened�
fBe sure the boiler is electrically powered and set in OFF: only has to be displayed on the screen�
fMake sure, by the gauge 1that the cold-system temperature is always within 0.5 and 1.5 Bar (op-
mal: 1÷1.5 Bar). The boiler is equipped with an automac system to control and restore the system
pressure, so it should always be correct (otherwise an error code will show, see "Alarms - boiler
block" on page 42). The lling cock with screw command 2 is foreseen for the rst lling, or for mo-
mentary use in case of failure to the automac system.
The system pressure raises with the temperature: a too high inial cold-system pressure could
lead to water drain from the 3 Bar safety valve aer the system heang-up.
Boiler acvaon
fPress the buon :
• once to set the boiler in summer mode only (DHW only). Summer mode is recognizable by the
only symbol presence on the display and not by the symbol presence ;
• pressing twice to set the boiler in winter mode for making the boiler working both for CH and
DHW. Winter mode is recognizable by the both symbols presence and on the display;
• at each press of the buon , the boiler cyclically switches from OFF to summer and to
winter + mode�
fOpening a DHW tap, the burner res up, and aer a lile me (that also depends on the characteris-
cs of the DHW system downstream the boiler) DHW is available. To have shorter waing mes, use
the funcon (see "The "plus" funcon (DHW pre-heang)" on page 10).
fOn winter mode + , when room thermostat demands for heang, the burner res up and
thanks to the water ow the heang get transferred . In case of contemporary demand of both DHW
and CH, the DHW demand has the priority ll the demand nish. Usually, as DHW does not last for
long, this priority does not aect the CH eciency in the system.

Green Heating Technology
10
Temperature adjustment
Note: correct adjustment leads to creang the condions for energy saving.
Note: if a Low Temperature Kit or an Outdoor Probe Kit are installed, refer to the relevant documen-
taon for what concerns the heang system temperature adjustment.
Note: don't make confusion between the heang system temperature here described, with the
temperature of the room set on the Room Thermostat.
fHeang system adjustment: by using the buons and , the seng of the heang
system temperature is made (the value, during the adjustment, is shown on the display under the
symbol ). Generally, in the deep cold season and/or with poor building thermal insulaon (or
if you noce that the burner stays on for a long me, but the room temperature rises too slowly)
prefer higher sengs. On the contrary, if you noce that the room temperature exceeds too much,
for thermal inera, the value set on the room temperature, it's appropriate to decrease the system
temperature. When the oponal Outdoor Temperature Probe Kit is installed, the system tempera-
ture is automacally managed and the use of the buons and is dierent: for details,
see also "Outdoor Sensor Kit" on page 56.
fDomesc hot water adjustment: the buons and set the temperature of the hot water
produced by the boiler (the value, during the adjustment, is shown on the display under the sym-
bol ). On this type of boiler, we suggest to set it in such a way to have a comfortable hot water
temperature by drawing only hot water or eventually by mixing it with a lile cold water. Avoid
maximum values if not strictly needed, that will force to mix the hot water with bigger quanes of
cold water. Consider that, because of the dispersions along the pipings, a certain me is needed to
have a stable water temperature on the cock outlet, therefore the best temperature evaluaon is
achieved during a bath or a shower.
The "plus" funcon (DHW pre-heang)
A special feature of this boiler is the funcon whose advantage is to keep the sanitary water
always warmed in order to reduce the DHW me delivery when required. This allows to shortcut the
waing me and the water waste.
Thanks to the insulated material the DHW exchanger is wrapped with, the boiler reduces the heang
losses and so gets an opmized consumpon of gas in comparison with the boilers that don't feature
this funcon (especially during brief and frequent DHW withdrawals).
It is possible:
• to set the pre-heang mode on three dierent levels;
•enable or disable the funcon;
How to set the desired "plus" level
fPut the boiler in mode, by pressing the buon :
fpress the buon for at least 3 seconds;
fon the le of the display, the sign 11/tS appears cyclically while on the right appears a number from
01 to 03 represenng the pre-heang level: (01=normal; 02=high, 03=maximum);
fto change the level, use the buons and ; to store, press the buon for 2
seconds, then ; to quit without saving, press just or wait 20 seconds.
If hard water is present, it's recommended to use the level no. 1. The level 3 can be used only if
the water has low scale content or if it's processed this way.

Green Heating Technology 11
How to enable or disable the "plus" funcon
fWith the boiler in winter or summer mode (not in OFF mode), press the buon to enable or dis-
able the pre-heang funcon . When it's acvated, the symbol appears on the display�
INFO menu
INFO for user
It is possible to get informaon displayed, about the boiler funconing and the values detected by its
sensors. Usually they are useful for the Technician only. Anyway, even the user can look at them without
aecng the good working of the boiler.
fWith the boiler in winter or summer mode (no OFF mode), press the buon INFO for at least 5 sec-
onds;
fthe display shows the symbol INFO, a sign on the le that idenes the data and the relevant value
on the right. To navigate through the available data, use the buons and :
•t1: outdoor temperature (if the outdoor temperature sensor is installed)
•t2: heang system return temperature (we remind that, during normal work, the system ow,
temperature is shown, on the le of the display)
•t3: solar collector temperature (if the relevant, compable system is present)
•t4: solar storage tank temperature (if the relevant, compable system is present)
•P: heang system pressure (in models equipped with a specic sensor)
•Fu: indicaon about the current working status. The meaning of the value on the right is:
0 no request (boiler idle)
1 in heang mode upon request of the
main or sole Room Thermostat (TA) or
Remote Control
2 in heang mode upon request of the
secondary Room Thermostat (TA2)
3 in heang mode upon request of
the third Room Thermostat on the
congurable AUX input
4 an-freeze funcon on heang system
5 DHW request
6 DHW pre-heang as per "plus" funcon
(without DHW request)
7 an-freeze funcon on DHW internal
components
8 an-legionella cycle in progress (not for
this model - only available on models
with DHW storage)
fTo quit the INFO menu, press the buon �
INFO for the technician
For informaon purposes only, we menon the Technical INFO menu which makes available a purely
technical category of data, in addion to the data available in the user INFO menu, which can be dis-
played with a dierent procedure. This funcon allows you to view the history of the last 10 alarms oc-
curred in the boiler (either RESET or SERVICE, see "Alarms - boiler block" on page 42) and other data.
Being read-only, also in this case access to this menu does not aect the good working of the boiler.
fwith the boiler in OFF mode, press the buon INFO for 6 seconds;
fthe display shows the symbol INFO, along with RESET or SERVICE ;
fto navigate through the available data, use the buons and . For the interpretaon
and use of data on a diagnosc level, please refer to the training courses and documentaon for the
Technicians�
fTo quit the technical INFO menu, press the buon �

Green Heating Technology
12
Incidental malfunconing
Avoid performing personally any intervenon that are job of the technician, for example the
ones on the electrical circuits, on hydraulic system or on the gas system, and whatever other
operaon that's not menoned in this "User Guide" secon and expressly allowed to the User.
Always address yourselves to qualied personnel.
Boilers must be always equipped with original accessories only.
ITALTHERM S.p.A. is not responsible for damages caused by the incorrect, wrong or unreason-
able use of not original materials.
The burner doesn’t turn on
fif the room thermostat (or programmable room thermostat, or similar) is installed, check that it is
really requiring the room heang;
fbe sure the boiler is set on winter + or summer mode (not in OFF). The reference symbols
must be shown on the display (see "The front control panel" on page 7);
fin case the display shows or , or in case the boiler seems to be working in an
inappropriate way, see "Alarms - boiler block" on page 42;
fcheck on the gauge that the boiler pressure is correct (1÷1.5 Bar in a cold state) or at least not below
0.5 Bar�
Shortage of domesc hot water producon
fcheck the DHW temperature is not set on a too low value: if so, adjust it (see "Temperature adjust-
ment" on page 10);
fcall a qualied technician to check gas valve regulaon;
fin the case of high withdrawals (especially if the water supply pressure is high and with models with
low rated power) the temperature of the water produced could be lower than the set one;
fcall a qualied technician to check, and eventually clean, the DHW exchanger.
Remark: where the water hardness value is too high, it is suggested the installaon of a soen-
ing device, in order to prevent the limestone precipitaon; this operaon avoids a frequent
cleaning of the coil�
Boiler inacvity
The eects of the periods of inacvity can be relevant in parcular situaons such as in ats 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 disconnecng all the sup-
plies, or to leave it on OFF mode (but electrically supplied) in order to let the An Frost Funcon work�
When there is the possibility of freezing it is convenient to chose between the advantages and the dis-
advantages of the SAFETY SHUT OFF and of the Stand By/An Freezing Way.
Safety shut o
fTurn o the general switch on the Electrical Supply Line of the Boiler;
fClose the Gas Tap;
When it is expected that the temperature is going to decrease under 0°C, call a technician to do
the following:

Green Heating Technology 13
• Fill the system with an an-freezing soluon (unless the system was already lled with said solu-
on) otherwise it must be completely emped. Noce that if it had been necessary to restore
the pressure (because of possible loss) in an heang system already lled with an An freezing
soluon, the concentraon of the soluon could have decreased and it could not guarantee the
An freezing Protecon.
• Let the condense collector syphon be emped unscrewing its inferior cap.
• completely empty the hot and cold sanitary water system, including the sanitary circuit and the
boiler’s sanitary exchanger.
Remark: the boiler is equipped with a system which protects the main components from the excep-
onal cases of mechanical lock, due to the inacvity in presence of water and scale. The an-
locking funcon can’t work in Safety shut o mode, because of the lack of electrical supply.
Before switching on the boiler again, have the circulang pump checked by a technician to make
sure it is not blocked due to inacvity (for the technician: proceed as described in paragraph
"Circulang pump rotor unlocking" on page 58).
Stand-by mode with an-frost & an-locking funcon
When the boiler is le in OFF mode during a period of inacvity, it will be protected against freezing by
several funcons provided in the electronic controller, which heat the parts involved when the tempera-
ture falls below factory set values.
The an-frost heang is accomplished by turning on the burner and pump.
In addion, when the boiler is in stand-by, it periodically acvates the main internal components to
avoid rare cases of blockage due to inacvity in the presence of water and lime. This can also occur
when the boiler is locked (red lamp on) provided that the system pressure is correct.
In order for these systems to be acve:
• the boiler must be receiving gas and electricity;
• boiler must be le on OFF mode ( shown on the display);
• system pressure must be correct (1÷1.5 bar in a cold state, minimum 0.5 bar)
In case of gas supply failure, or if the boiler locks for other reasons (the display shows
or ) the burner won’t turn on. Nevertheless, any me 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 an-frost protecons cannot intervene in the absence of electricity. If you an-
cipate this possibility, we recommend you add a good brand of an-freeze to the heang sys-
tem, following the producer’s instrucons.
We recommend to ask directly the installer/technician about the type of anfreeze product
put in the heang system during installaon.
When the power comes back on, the boiler will check the temperature measured by the two
probes and, if it suspects freezing veried by a parcular automac control cycle, alarm 39 will
be triggered. For more details, see the relave descripon in the paragraph "Alarms - boiler
block" on page 42.
We recommend that you completely empty the hot and cold sanitary water system, including
the sanitary circuit and the boiler’s sanitary exchanger. The an-frost funcon does not protect
the sanitary circuit outside the boiler.

Green Heating Technology
14
“Ambient An-Frost” Funcon
Note: if you want to use the “Ambient An-Frost” funcon that is oen available in common room
thermostats or chronothermostats, it is necessary to leave the boiler in Winter + mode
and NOT in mode.
The “Ambient An-Frost” funcon does not protect the sanitary circuit outside the boiler and,
especially, in areas where the heang 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.
Installaon
Law and regulaon prescripons for the installer
Always comply with naonal and/or local regulaon about BOILER INSTALLATION.
Always comply with naonal and/or local regulaon about WORK SAFETY of Personnel in
charge of installaon.
Characteriscs of the room: as this boiler has an heat output lower than 35 kW (about 30000 Kcal/h),
it is not required to install the appliance in a dedicated room, provided that the room complies with
the regulaon in force and that all installaon rules assuring a safe and regular gas boiler operaon,
are strictly respected�
Permanent venlaon of the installaon room is mandatory and extremely important when
a boiler with air draught from the installaon room (B… appliance type) is installed. Venlaon
must be made and sized in compliance with Laws and Rules in force.
Presence of other appliances: the presence of other appliances (especially if they interfere with the
boiler draught) can be forbidden by the regulaon in force or can require modicaons (e.g. the
enlargement of the venlaon opening or the making of new ones).
Instrucng the user: at the end of the installaon, the installer must:
• explain the operaon of the boiler and its safety devices to the user;
• give this user this booklet and the documentaon within his/her competence, duly lled in where
required.

Green Heating Technology 15
Dimensions and connecons
50
45
L
TA
RMCGF
CF
G R
M G R
C F
M
130
77
400 324
7279
10
9
7070 65 65 65 657070 65 65 65 65 120
SC
23÷43 23÷43
700
TA / L
SC
00435 01
195
190210
2
3
1
Legend:
1 Flue outlet
2 Air intake for coaxial system
3 Air intake for split-pipe system
M System ow (¾”)
C DHW outlet (½”)
G Gas: connecon on the boiler ¾”;
on the wall, using the oponal
original ng kit ½”
F Fresh water inlet (½”)
R System return (¾”)
TA/L Indicave posion for electrical
power supply and room
thermostat wirings
TA Room thermostat wiring
L Electrical power supply wiring
SC Indicave posion for the
condensate drain
front view -
hydraulic connecons
on the wall
(with oponal ng kit)
see also page 18
upper view
front view -
hydraulic connecons
on the boiler
le side view -
hydraulic connec-
ons on the boiler
Pump capacity diagram
0
1
2
3
4
5
6
0 200 400 1000 1200 1400600 800
00446A
00
MAX
pressure (m H2O)
water ow (l/h)
City Top 25 K
See also "Pump sengs" on
page 42. The curves MAX
shown in these graphs refer
to the head available to sys-
tem at factory seng (see
par. 35 on page 36) and
are net of the load loss of the
circuits inside the boiler. The
area represents the working
range with pump in modu-
lang mode (see par. 33 on
page 36)

Green Heating Technology
16
0
1
2
3
4
5
6
0 200 400 1000 1200 1400600 800
00446C
00
MAX
pressure (m H2O)
water ow (l/h)
City Top 35 K
Warnings for the installaon of oponal kits or special systems
Floor heang system
The safety thermostat(s) that protects the oor against overheang (that could damage the
cladding, the structure or the system itself) must be installed on the ow starng end of the
serpenne embedded in the oor itself. It should not installed on the system ow pipe in prox-
imity of the boiler, otherwise frequent and unjused boiler locks, caused by its triggering, are
possible�
Specicaons for intake air
Air must be withdrawn from places free of pollutant (like uorine, chlorine, sulfur, ammonia, alkaline or
similar agents). In the event of installaon of the boiler in atmospheres with not negligible presence of
aggressive chemical substances (e.g. hairdressing salons, laundries) we recommend to foresee the air
intake from outdoor, choosing the type C installaon.
Domesc water supply characteriscs
The cold water inlet pressure must be lower than 6 Bar. Besides, for an opmal boiler funconing, wa-
ter pressure should be more than 1 Bar. A lower pressure could make dicult to restore correctly the
pressure the heang system, and reduce the ow 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 soener to bring the hardness below that value.
Besides, the presence of solid residuals or impuries in the water (for example in case of new systems)
could compromise the correct funconing of the boiler. For DHW producon systems, the regulaon in
force prescribes a safety lter to protect the systems.
The condensing burner/exchanger assembly requires parcular characteriscs for the heang
system liquid, more restricve than the ones of the inlet domesc water. See the "Heang" sec-
on of the table "Technical data" on page 51.

Green Heating Technology 17
Protecon against freezing
Thanks to its anfreeze system, inner components could never reach a temperature lower than 5°C. This
system is acvated when the boiler is supplied by the electrical and gas lines, provided that the pressure
in the heang system is correct.
If some part(s) of the system external to the boiler could be subject to freezing risk, it is advis-
able to ll the heang circuit with, instead of water, an anfreeze liquid specic for heang
systems, propylenic glycol based, following the instrucons of its manufacturer. Pay aenon
to the correct product concentraon: adding those substances to the heang water in incorrect
dose could lead to the deformaon of the seals and cause unusual noises during operaon.
ITALTHERM S.p.A. will not be held responsible for consequent damages.
Instruct the User about the anfreeze funcon of the boiler and about the anfreeze product
added in the heang system.
Outdoor installaon in a parally protected place
This type of forced draught condensing boiler can
be installed outdoor, but only in parally protect-
ed places�
The boiler minimum and maximum working tem-
peratures are menoned in the paragraph "Tech-
nical data" on page 51 and on the boiler data
plate�
The materials used for the boiler installaon, in-
cluding the devices and/or the materials used for
thermal insulaon, should be so to maintain their
funconality within the temperature range indi-
cated on the data plate�
If the place where the boiler is located is converted from outdoor to indoor (e.g. veranda) it will
be necessary to verify the compliance of the new conguraon with the laws and rules in force,
and to make the modicaons required.
00004 00

Green Heating Technology
18
Posioning and fastening
Remark: A re-usable metal jig ( D in the gure) can be ordered separately,
so as to facilitate connecons and xing points posioning (when the
original connecon kit is used). If the metal jig and/or the original
connecon kit are not used, refer to the paragraph "Dimensions
and connecons" on page 15 for the posion of the connecons
directly on the boiler.
fLocate the exact posion of the boiler considering the sucient clear-
ances: at least 50 mm from each side, 50 mm from the front and 300 mm
on the boom side
fChoose the fastening/hooking opon among A or B, depending on the
xing devices used or already available if any (open hooks; wallplugs;
“stud” type with nut).
fIf the metal jig is used, hang it on the wall using the same xing devices
and the holes or slots A or B�
fFix up the connecons and all ducts for heang ow and return, cold
water, hot water, gas and electrical cables, predisposing them
in the holes of the metal jig or, as an alternave, respecng the
measures in the paragraph "Dimensions and connecons" on
page 15. The upper edge of boiler’s body, used as a reference
in the paragraph "Sizing the ue system" on page 26, is repre-
sented by the doed line C in the gure.
•model 35 only: pull upwards and remove the plasc blocks
that hold the sides of the expansion vessel�
fRemove the jig (if used) and hang the boiler to the xing devices,
using the chosen holes or slots A or B�
fRemove the plasc caps placed to close the hydraulic connec-
ons and the condense outlet hose of the boiler.
fProceed with the hydraulic, gas, electrical and ue connecons following the instrucons and warn-
ings reported in the following paragraphs�
32.5
36
18
328
70
45 50
7065656565
9
18
36
335
400
32.5
35 11 14
40 30 15
727
A A
B B
C
D
A
B
C
00321 00
Heang
Flow (3/4”)
Hot Water
Outlet (1/2”)
Gas (1/2”)
Cold Water
Inlet (1/2”)
Heang
Return (3/4”)
Electrical
Power Supply
Room
Thermostat
00359 A 00

Green Heating Technology 19
The connecons of the boiler are engineered to t plain couplings with screw ring, interposing
a plain gasket of suitable size and material, that ensure a reliable seal even without excessive
ghtening force. They are NOT suitable for hemp, teon tape or similar materials
Hydraulic system (DHW and heang)
Make sure that the hydraulic and heang systems ducts are not used as earth connecons of
the electrical system. They are absolutely NOT SUITABLE for such a use. Besides: they don't
guarantee the earth dispersion; in case of electrical fault they could generate a fulguraon risk;
there could take place galvanic currents in the pipings and consequent corrosion and hydraulic
leaks�
Advices and suggesons to avoid vibraons and noises in the system
fDo not use pipes with reduced diameters;
fDo not use bends with small radius and reducons of important secons.
Cleaning and preservaon of the systems
The eciency, the reliability and the safety of the boilers, as all generic thermal systems and compo-
nents, depend strictly on the features of the water that supply them and on their treatment.
A proper treatment of the water improves the protecon of the systems against corrosions (and there-
fore perforaons, noise, leaks, etc.) and limestone incrustaons that drascally reduce the eciency
of the thermal exchange (consider that 1 mm of limestone incrustaons reduces of 18% the thermal
exchange of the heang element on which it has been formed).
ITALTHERM guarantees its products only if the characteriscs of the water comply with UNI 8065, re-
ported also in laws on energy saving�
Thoroughly wash the heang system with water, before connecng the boiler. This will elimi-
nate residual like welding drops, slag, hemp, masc, mud, rust and other dirt from pipes and
radiators. Otherwise, these substances could enter the boiler and damage the internal compo-
nents (pump etc.).
fIn case of old or very dirty systems, to wash them use specic, proven eciency products, in the
suitable quanty and following the instrucons of its manufacturer.
fIf the water on boiler inlet is harder than 25° fr, it’s required to install a soener to bring the hardness
below that value, as required by the reference regulaon.
fFor oor system and generally all low temperature systems, the water treatment product must have
lming acon (protecon against corrosion and incrustaon) and acon against bacteria and algae.
Heang system
fConnect the safety evacuaon ducts of the boiler to an evacuaon funnel. If safety valves are not
connected to an evacuaon device, their intervenon could ood the room. The manufacturer can-
not be held responsible for any damage arising from that situaon.

Green Heating Technology
20
Condense drain
Insert the exible pipe of condense outlet inside the outlet funnel (or other inspectable connecon de-
vice) properly installed for this purpose, or in the outlet funnel of the safety valve, in case of the above
menoned outlet is able to receive the acid liquids of the condense as foreseen by the norms in force
in maer of condensing boilers.
Requirements for the condense drain system:
◦ It must be made in a way that doesn't allow the condense freezing or other blockages, and it
must not allow modicaons or obstrucons
◦ before the rst starng up of the appliance, ensure that the condense can be correctly drained
◦ if the intended use of the building unit foresaw the installaon of a condensate neutralizaon
system, make sure that you have the relevant instrucons for use, cleaning and maintenance
Heang system lling and pressuring
Once all system connecons have been carried out, proceed with system lling. This operaon should
be made manually, with care, respecng the following steps:
Check that the boiler is not electrically supplied (to avoid the acvaon of the automac lling
system).
fOpen the radiators venng devices;
fCheck that the plug of the automac air vent, incorporated in the boiler circulator, is unscrewed: if
not, unscrew it and leave it unscrewed, even aerwards, for normal operaon;
fIf it's required to ll the system with an-freeze soluon, do this operaon, then hermecally close
the connecon or the valve used to put the soluon in, to allow the pressurizaon.
fGradually open the lling cock 2 by using a screwdriver;
fCheck the correct funconing of automac venng devices, eventually installed;
fClose the radiators venng devices as soon as water
ows out of them;
fMake sure, by reading the pressure gauge 1, that the
pressure reaches the opmal value of 1.0 bar (max 1.5
bar);
fClose the water lling cock 2 and bleed each radiator
again;
fRepeat the venng and pressurizaon operaons unl
the air is completely purged from the system.
Remark: when the boiler is power supplied, regard-
less its working mode, the system pressure will be
checked and automacally restored, if necessary.
00445_00
2
3
4
1