Italtherm CITY PLUS Series manual 

use
installation
adjustment
maintenance
Handbook
instruction
ENG
Green Heating Technology
IMPORTANT! Install the gasket includ-
ed in the documents bag, on the intake/
outlet ange, as shown on page 20.
CITY PLUS
24 HE
30 HE

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2
Table of Content
Safety warnings
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
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 ....................... 9
Incidental malfunconing .................. 10
The burner doesn’t turn on .................... 10
Shortage of domesc hot water producon ...... 10
Boiler inacvity .......................... 11
Safety shut o .............................. 11
Stand-by mode with an-frost & an-locking
funcon ................................. 11
“Ambient An-Frost” Funcon ................. 12

Law and regulaon prescripons for the
installer .............................. 12
Dimensions and connecons ............... 13
Pump capacity diagram .................... 13
Warnings for the installaon of oponal kits or
special systems ........................ 14
Floor heang system . . . . . . . . . . . . . . . . . . . . . . . . . 14
Specicaons for inlet air .................. 14
Domesc water supply characteriscs ........ 14
Protecon against freezing ................. 15
Condensate drain trap ..................... 15
Outdoor installaon in a parally protected
place ................................ 16
Posioning and fastening .................. 16
Hydraulic system (DHW and heang) ......... 17
Advices and suggesons to avoid vibraons and noises
in the system ............................ 17
Cleaning and preservaon of the systems ........ 17
Heang system .............................. 18
Condense drain .......................... 18
Heang system lling and pressuring ........ 18
Gas connecon .......................... 19
Electrical connecons ..................... 19
Flue systems ............................. 20
Fume outlet/air intake diaphragm and seal
installaon .............................. 20
General indicaons .......................... 20
Examples of installaon of inlet and outlet ducts .. 22
Dimensioning the inlet and outlet ducts ......... 23
Flue system types ............................ 24
Adjustment and Maintenance
First starng up .......................... 25
Access to the inside of the boiler ............ 26
Inlet gas check ........................... 26
Max and Min pressure adjustment .......... 26
Max heang power adjustment ............. 27
Burner pressure tables .................... 29
Electronic sengs ........................ 30
Accessing the main board ..................... 30
Main board sengs .......................... 30
Combuson check ........................ 31
Gas conversion ........................... 31
Draining the heang system ................ 33
Pump sengs ............................ 34
Visualizzazioni .............................. 34
Circulang pump alarms . . . . . . . . . . . . . . . . . . . . . . 34
Seng ..................................... 34
Alarms - boiler block ...................... 35
Warnings for servicing ..................... 40
ErP Data - EU 813/2013 .................... 41
Product che - EU 811/2013 ................ 41
Technical data ............................ 42
Boiler internal components ................ 44
Electrical diagram ........................ 45
Hydraulic diagram ........................ 46
Addendum
Outdoor Sensor Kit ....................... 47
Installaon and seng ....................... 47
Outdoor Sensor kit and Remote Control ......... 47
Remote Control Kit ....................... 48

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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.
f 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 inlet 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  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  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) , as
they are potenally dangerous.
f, 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.
f, remove or cut o any potenal dangerous item.
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 . Any other ulizaon must
be considered dangerous and incorrect.
fIt is strictly forbidden to use the appliance  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 the  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 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-
 (especially gloves) while doing the above menoned operaons
Installaon, use and maintenance


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User warnings
Important
In case of gas smell:
1 -       
sparks;
2 - open immediately the windows and the doors in order to cleanse the room air;
3 - close the gas supply taps;
4 - 
   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).
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 inlet/outlet system that must be ecient and made according to the laws in force
(see examples in paragraph "Flue systems" on page 20). 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 11 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
 It is then forbidden to let children or inexperi-
enced people be close to the boiler, during its operaon.
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 inlet 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.

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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.
f (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-
, 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

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User guide
The front control panel
1
green

 - boiler not electrically supplied.
Blinking - boiler electrically supplied, but not acve because the knob 12 is on .
On - boler acve. Knob 12 on or on along the scale .
actuated for mistake, by the user, a funcon reserved to
the technician. Rotate immediately the knob 13 back on the scale .
2
yellow
Burner Indicator Light
 - the ame in the burner is o.
On - the ame in the burner is on.
3
red
Alarm Indicator Light
 - no problems detected.
 - see "Alarms - boiler block" on page 35.
the user has acvated, by mistake, a funcon reserved to
the technician. Turn the knob 13 on the scale immediately.
4service Indicaon, on the display, for the Technician, usually not displayed.
52-digit
number
on the
display
Normally it indicates, in °C, the temperature of the water going out of the boiler (heat-
ing or domesc).
During the adjustment of the heang system temperature (rotang the knob 12 along
the scale ) or domesc hot water (rotang the knob 13 along the scale ) it
shows the set value, in °C.
6
-
on the
display
Usually, they are shown  and they indicate that the boiler is ready to
supply heat to the relevant heang or DHW  When the boiler is in Summer
mode  
They blink during the actual heat delivery, by the boiler, to the relevant system.
7
8
9
10
12 13
14
15
16
11
3
4
6
7
5
1
2
00037 B 0 0

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8Posion on which the knob 12 should be posioned to turn the boiler o or to reset
a boiler block.
9Posion on which the knob 12 should be posioned to acvate the boiler in Winter
mode (both Heang and Domesc Hot Water funcons available).
10 Scale on which the knob 12 should be posioned to adjust the Heang system tem-
perature (aenon: only if the Remote Control Kit is not installed).
11 Posion on which the knob 12 should be posioned to acvate the boiler in Summer
mode (only Domesc Hot Water funcon available and exclusion of Heang) (only if the
Remote Control Kit is not installed).
12 boiler
mode Knob that allows to switch the boiler in OFF mode Summer 11 or Win-
ter 9 and to adjust the Heang system temperature 10.
If the Outdoor Sensor Kit is installed, see "Outdoor Sensor Kit" on page 47.
If the Remote Control Kit is installed, see "Remote Control Kit" on page 48.
13 DHW Knob that allows to adjust the Domesc Hot Water temperature (along the scale 14 ).
The use of the posions 
14 Scale on which the knob 13 should be posioned to adjust the Domesc Hot Water
temperature.
15 service Posions of the knob 13 which use is reserved to the technician.
Do not turn the knob 13 on these posions.
16
Commands on the lower side
17 System pressure gauge
18 System lling and pressure restoring cock
19 GAS cock
Commands outside the boiler
Externally the boiler, suitably posioned in the building
(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 prescribed 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.
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. On trade are available programmable room thermostats: most of them allow to make a
weekly programming of various temperature levels, besides special programs for various purposes.
We suggest to choose original ITALTHERM accessories
00001_00
17
18
19

Green Heating Technology 9
Typical use
Preliminary operaons
fFirstly, the knob 12 should be on the
posion
fMake sure, by the gauge 17 that the
cold-system temperature is always
     
. When the pressure drops
, the boiler stops work-
ing. In this case, open the system ll-
ing cock 18 up to obtain, on the gauge,
.
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.
fMake sure that the gas cock 19 is open.
fMake sure that the boiler is electrically supplied: green light 1blinks.
Boiler acvaon
fRotate the knob 12 on Summer 11 if you want to have only hot water producon, or on Win-
ter 9 if you need both room heang and hot water producon.
fOpening a hot water cock, the burner ignites and, aer a short me (that also depends on the char-
acteriscs of the plant externally the boiler) hot water ows from the cock.
fIn Winter mode, consequently a request by the Room thermostat, the burner ignites and the
produced heat is sent, by means of the system vector liquid, to the heang elements of the building.
If, in the mean me, a Domesc Hot Water request takes place, this laer has the priority for the
whole request me. Since the DHW requests are usually limited in me, they generally don't aect
the room heang.
Temperature adjustment
Note: correct adjustment leads to creang the condions for energy saving.
fby rotang the knob 12 along the scale 10, the seng of the heat-
ing system temperature is made (the value, during the adjustment, is shown on the display 5). Gen-
erally, 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.
Note: if the Outdoor Sensor Kit is installed, see also "Outdoor Sensor Kit" on page 47; if the Re-
mote Control Kit is installed, see also "Remote Control Kit" on page 48 and the relevant instruc-
on booklet.
Note: don't make confusion between the heang system temperature here described, with the
temperature of the room set on the Room Thermostat.
8
9
10
12 13
14
15
16
11
3
4
6
7
5
1
2
00037 B 0 0

Green Heating Technology
10
f   
by rotang the knob 13 along the
scale 14, the seng of the hot
water produced by the boiler, is made
(the value, during the adjustment, is
shown on the display 5). On this type
of boiler, we suggest to set the knob
in such a way to have a comfortable
hot water temperature by drawing
only hot water or eventually by mix-
ing it with a lile cold water. Avoid
maximum values if not strictly need-
ed, that will force to mix the hot water
with bigger quanes of cold water.
Consider that, because of the disper-
sions 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 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;
fcheck that the electrical power supply is present and that the Summer/Winter knob isn't posi-
oned on (stand-by) but on Summer or Winter . The  light should be
steadily ON (see details in the paragraph "The front control panel" on page 7);
fif the  locking light was on or blinking, or if you noce an anomalous behaviour of the light
indicators, see the paragraph "Alarms - boiler block" on page 35;
fcheck on the gauge that the boiler pressure is correct (1÷1.5 Bar in a cold state) or at least not below
;
flet the technician to look up the notes in the paragraph "Electrical diagram" on page 45.
Shortage of domesc hot water producon
fcheck that knob is not set on a too low value or to the “service”posion
fcall a qualied technician to check gas valve regulaon;
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.
8
9
10
12 13
14
15
16
11
3
4
6
7
5
1
2
00037 B 0 0

Green Heating Technology 11

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  disconnecng all the sup-
plies, or to . When there is the possibility of freezing
it is convenient to chose between the advantages and the disadvantages 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:
• 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 re-igning the boiler, have a technician check that the pump is not blocked due to inac-
vity (for the technician: unscrew the plug in the centre of the cap to access the rotor sha and
turn it with a screwdriver or other suitable tool).
Stand-by mode with an-frost & an-locking funcon
When the boiler is le in stand-by 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 in stand-by mode (Summer/Winter knob on, green lamp ashing);
• system pressure must be correct (1÷1.5 bar in a cold state, minimum 0.5 bar)
In case of lack of gas, the burner won’t turn on and the boiler will go in LOCK OUT state (red lamp on or
ashing). Nevertheless the pump will work, making the water circulate in the system and reducing in
this way the possibility of freezing. It is available, on demand, an An Frost Electrical resistance kit which
must be installed on the secondary exchanger to protect the boiler also in case of lack of gas.

Green Heating Technology
12
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.
 

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 35.
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.
“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 stand-by.
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.



            

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.
 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.
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).

Green Heating Technology 13
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.

16
23÷43
68
23÷43
68
3
52 52 88 39
3545
116
116
52 52 88 39
G
G
TA / L
L
TA
F
FC
C
M
M
R
R
400
700 680
159
120
136
R
M C GF
300
00249 00
712
10
283117
193
132
210
3
2
1
SC
SC
Legend:
1 Flue outlet
2 Air inlet for coaxial system
3 Air inlet for split-pipe system
 Gas: connecon on the boiler ¾”;
on the wall, using the oponal
original ng kit ½”
R System return (¾”)
M System ow (¾”)
C DHW outlet (½”)
 Fresh water inlet (½”)
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)
upper view
front view -
hydraulic connecons
on the boiler
le side view -
hydraulic connec-
ons on the boiler

0
1
2
3
4
5
6
0 200 400 1000 1200600 800
6m
00250A
00
pressure (m H2O)
water ow (l/h)

See also "Pump set-
ngs" on page 34.
The curves shown in
these graphs refer to
the head available to
system for each curve
that can be set on the
circulaon pump and
are net of the load loss
of the circuits inside the
boiler. The factory set-
ng is highlighted.

Green Heating Technology
14
0
1
2
3
4
5
6
0 200 400 1000 1200600 800
7m
00250B
00
pressure (m H2O)
water ow (l/h)


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.

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
inlet from outdoor, choosing the type C installaon.

 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       upstream the
boiler.
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.

Green Heating Technology 15

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. On request, it is possible to install an anfreeze electrical resistance device
on the domesc exchanger, so as to protect boiler even in case of gas lack.
In case of boiler installaon in rooms where temperature can drop down to 0°, it is advisable
to ll the heang circuit with 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 con-
centra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.r.l. will not be held responsible for consequent dam-
ages.
 

Condensate drain trap
Check the siphon sealing by checking that caps 1, 2, 3and 5 are
correctly and fully screwed/inserted.
The siphon is provided with a condensate level sensor, installed in hole 4, that
controls the burner shut down (thus stopping the condensate producon)
before it is full.

Green Heating Technology
16
-

 forced draught models can be installed out-
door, but only in parally protected places.
The boiler minimum and maximum working tem-
peratures are menoned in the paragraph "Tech-
nical data" on page 42 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  within the
temperature range indicated 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 compli-
ance of the new conguraon with the laws and rules in force, and
to make the modicaons required.

Remark: A re-usable metal jig ( D in the gure) can be ordered sepa-
rately, 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 "Di-
mensions and connecons" on page 13 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 for maintenance and servicing: at least 50mm laterally and 300
mm on the lower side
fTo x the boiler with wallplugs (“stud” type with nut), centre the relevant wall holes as regards
to A points. To hang it with open hooks, place hooks in correspondence with Bpoints.
fIf the metal jig is used, hang it on the wall using the same wallplugs or hooks and the holes or slots
indicated in the gure ( A for the plugs and B for the open hooks).
32.5
36
18
328
52 52 88
16
39 45 35 36 53
18
36
335
400
32.5
35 11 14
35
712
A A
B B
C
D
A
B
C
00005 04
If necessary, the open hooks can be
posioned at any point along the edge B
of the boiler's frame bracket, provided
that they are 2 and that they support the
device in a correct and safe way.
00004 00
Gas (1/2”)
Hot Water
Outlet (1/2”)
Cold Water
Inlet (1/2”)
Heang
Flow (3/4”)
Heang
Return (3/4”)
Electrical
Power Supply
Room
Thermostat

Green Heating Technology 17
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 respecng the measures in the
paragraph "Dimensions and connecons" on page 13. The upper edge of boiler’s body, used as a
reference in the paragraph "Flue system types" on page 24, is represented by the doed line Cin
the gure.
fRemove the jig (if used) and hang the boiler to the wallplugs or hooks, using the holes or slots indi-
cated in the gure ( A for the plugs and B for the open hooks).
fplaced to close the hydraulic connecons on the boiler.
fProceed with the hydraulic, gas, electrical and ue connecons following the instrucons and warn-
ings reported in the following paragraphs.
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
Remark: the lower grid is spare inside packing, not assembled. We suggest to x the grid only at the
end of the boiler installaon operaons.

Make sure that the hydraulic and heang systems ducts 
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.).
f, 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.

Green Heating Technology
18
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.
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.
The system must be made in order to avoid the condense freezing. Before the acvaon of the
appliance be sure that the condense can be evacuated correctly.

Once all system connecons have been carried out, proceed with system lling. This operaon should
be made with care, respecng the following steps:
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 1 ;
fCheck the correct funconing of automac venng de-
vices, eventually installed;
fClose the radiators venng devices as soon as water ows
out of them;
fMake sure, by reading the pressure gauge 2, that the pres-
sure reaches the opmal value of  ;
fClose the water supply valve 1 and bleed each radiator
again;
fRepeat the venng and pressurizaon operaons unl
the air is completely purged from the system.
00006 00
2
4
1
3

Green Heating Technology 19

Due to various installaon possibilies, the gas cock 3 supplied with the original Connecons Kit has a
simple male Ø ½” connecon, facing the rear of the boiler. The gas pipe 4, upstream the gas cock 3, should
be supplied by the installer.
          


those materials does not make the suitable seal with consequent gas leaks!
 

The gas connecon, as generally the boiler installaon, must be done by qualied personnel as
prescribed by the regulaon in force, because a faulty gas connecon could lead to re, explosion
and other very serious damages to persons, animals and objects. The manufacturer cannot be
held responsible for any damage arising from that situaon.
fVerify what follows:
• cleaning of all system gas pipes in order to avoid the presence of work residuals that could com-
promise the correct boiler funconing;
• gas line and ramp conformity with laws and rules currently in force;
• internal and external ghtness of the gas system and connecons;
• supply pipe must have a secon greater than or equal to the boiler one;
• supply gas must correspond to the one for which the boiler has been set: otherwise, it's manda-
tory to ask to qualied personnel to set the boiler for the correct gas type;
• an intercepon valve must be installed upstream the appliance.
fOpen the meter valve and purge the air that is inside the system pipes (including all the appliances).

The link of the room thermostat works with a safety extra low voltage (SELV); connect it to
the voltage free contacts of the room thermostat/chronothermostat. On NO account must any
electrical voltage be applied to these terminals.
All low-voltage wirings (e.g. Room Thermostat or Chronothermostat for trade) must be kept
separate from power supply cables, as to avoid boiler malfunconing due to electrical noise. It
is advisable to use separate tubes for them.
The boiler must be connected to a 220÷240V - 50Hz electrical power supply. In any case, the power
supply voltage must be within the range –15% ... +10% from the nominal value (230V); otherwise it
may cause malfuncons or failures. It is necessary to respect the polaries L-N (Live L=brown; - Neu-
tral N=blue) - otherwise the boiler may not work - and the earth connecon (yellow-green cable).
 in compliance with the regulaon currently in force.
The installaon must be made complying the regulaon currently in force and generally with the
standard cra rules.
For the general electrical supply of the appliance the bipolar switch should be used. The use of adaptors,
mulple taps and extensions is not allowed.
If the supply cable must be replaced, use one of the following cable types: H05VVF or H05-VVH2-F. It is
 To replace the cable,

Green Heating Technology
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open the control panel cover, unlock its fastening device and disconnect it from the terminals. Install
the new cable proceeding in the reverse way. When connecng 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 ecient earth-
ing system, executed as indicated by the safety rules actually in force.
A qualied technician must check that the electrical system is in line with the maximum power allowed
by the boiler, indicated on the data plate, with parcular aenon to the cables secon.
ITALTHERM S.r.l. declines any responsibility for damages to persons, animals or things caused by
the faulty or missing connecon of the boiler earthing and by failure to comply with the rules.

Fume outlet/air intake diaphragm and seal installaon
: for a correct and safe boiler operaon it
is necessary to t seal 1, supplied with the boiler, on
the intake/outlet ange 2, posioning it correctly as
shown in the gure before inserng the fume outlet
pipe.
Then, refer to the tables in "Flue system types" on
page 24, calculate the equivalent linear length
considering any supplementary installed curve
(excluding those already shown in the drawings) and,
as shown in the
gure.
General indicaons
To grant the funconality and eciency of the appliance it is indispensable to realize inlet and outlet
ducts using ue accessories specic for condensing boilers.
WARNING: the specic ue accessories components for condensing boilers, especially the parts
which are in touch with the ues inlet, are so projected because they are made with -
terials acids resistant, but because of their nature, they are not suitable to resist to the higher
temperature of the ues of the tradional boilers. So 

When installing the pipes, we recommend lubricang the inside of their gaskets exclusively with
silicone lubricants since their material (EPDM peroxide) is not compable with other types of
oils or greases
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