Hermann Eura Condensing User guide

IMPORTANT
THE FIRST IGNITION OF THE BOILER MUST BE EXECUTED BY AN
AUTHORIZED TECHNICIAN ACCORDING TO THE LAW 46/90.
Assigning all the operations for the first ignition to a Hermann Authorized Service
Center the particular and exclusive Hermann Conventional Warranty is activated.
For further information consult the coupon which you can find in the boiler’s
documents envelope.
Assigning all the operations for the first ignition to a Hermann Authorized Service Center the particular and exclusive Hermann Conven-
tional Warranty is activated. For further information consult the coupon which you can find in the boiler’s documents envelope.
INSTALLATION, USER
AND SERVICING INSTRUCTIONS
for
EURA
Condensing
WALL HUNG COMBINATION BOILER

DANGER: All warnings preceded by this symbol MUST be carefully respected so as
to avoid any accident of mechanical (e.g. wounds or contusions) or general origin.
DANGER: All warnings preceded by this symbol MUST be carefully respected so as
to avoid any accident of ELECTRICAL origin (fulguration).
DANGER: All warnings preceded by this symbol MUST be carefully respected so as
to avoid any accident of THERMIC origin (scalds).
Attention: All warnings preceded by this symbol MUST be carefully respected so as to avoid
any disfunctioning and/or damage to the appliance or other objects.
MANUFACTURER DECLARATION
Hermann boilers have obtained the CE certification (DM dtd. April 2nd 1998, Law 10/91, art. 32) and
meet minimum efficiency requirements, both at normal and 30% load, provided by DPR 412/93 (ac-
cording to Law 10/91, art.4,sub-section 4).They are in conformity with following Directives: Directive
on appliances burning gaseous fuels (90/396), Directive on electro-magnetic compatibility (CE 89/
336), Efficiency Directive (CE 92/42), Low Voltage Directive (CE 73/23), and relevant modifications.

3
Index
Warning .........................................4
The condensing boiler .......................... 5
Technical data...............................8
Installation ..................................12
Safety laws and rules referred to
technicians assigned to boilers
installation ..................................... 12
Reference norms and laws
for installation ................................ 12
Boiler location ..................................... 13
The syphon outlet too full ................... 13
Fixing the boiler .................................. 14
Boiler template ................................... 14
Hydraulic connections ........................ 15
System filling ...................................... 16
Gas connection .................................. 17
Electrical connections......................... 17
Connections to the chimney
EURA Condensing ........................ 19
Flue options
EURA Condensing ........................ 23
System with secondary zone.............. 25
First firing,
regulation and
servicing instructions ................26
First ignition operations ...................... 27
Maintenance operations ..................... 28
Gaining access to
manual regulation devices............. 29
Cleaning the combustion group .......... 30
Checking and combustion regulation . 32
Regulation programming .................... 34
Slow opening regulation ..................... 37
Max heating power
regulation ...................................... 37
Excluding automatic by-pass .............. 38
Draining EURA boiler ......................... 38
Other boiler programme ..................... 39
Crypt Warnings for Technical experts . 42
Servicing warnings ............................. 44
Boiler internal components ................. 45
Electrical diagram ............................... 46
User instructions ........................47
Warnings for boiler
commissioning .............................. 47
Useful tips .......................................... 47
Warnings ............................................ 48
Gaining access to control panel ......... 49
Switching on/off
and running boiler ......................... 49
Control panel details........................... 51
Boiler blocking and alarm codes......... 53
Boiler inactivity ................................... 57
Eventual problems.............................. 58
Warning while using ........................... 59
INDEX
sections for the usersections for the technician

4
for the technician and for the user
Introduction
WARNING
The instructions manual is an essential and complementary part of the product and it is
supplied together with the boiler.
Carefully read the manual, achieving all important information for a safe installation,
use and servicing.
— Carefully keep the manual for any further consultation you may need.
— The installation must be carried out by a qualified technician, in accordance with manu-
facturer instructions and with the relevant requirements of the current issue.
— A qualified technician is a person with a specific technical competence in the field of
the heating appliances for domestic use and domestic hot water production, as indi-
cated by the Law [ID of Your National rule, if any, regarding Technicians competence].
— Operation that User can perform are limited to those described in “USER INSTRUC-
TIONS” section.
— The manufacturer has no contractual and extra-contractual responsibility for any dam-
age arising from wrong installation, wrong use and non-observance of current laws and
instructions given by the manufacturer himself.
— Important: this gas boiler is used to heat the water at a temperature lower than the boiling
one, at atmospheric pressure; it must be connected to an heating system and/or to a domestic
hot water system, in accordance with its features and power.
— Packing items (cartons, nails, plastic bags and so on) must not be left within children
easy reach, as they are potentially dangerous.
— Before any cleaning or servicing operation, switch off the main electrical switch of the
heating system and/or any other suitable switch providing electrical disconnection of
the gas boiler.
— In case of fault and/or bad operation of the appliance, disconnect it immediately and do
not try to repair it by yourselves.
— Do not obstruct either momentarily or partially inlet/outlet terminals;
— Do not leave inflammable materials, neither liquid or solid (i.e. paper, rags, plastic, poly-
styrene) next to the boiler.
— Do not put any object on the boiler.

5
for the technician and for the user
Introduction
Boiler servicing and repair must be carried out exclusively by [HERMANN Authorized Servicing
Centres] [qualified technicians], which will use original spare parts. Strictly observe the above re-
quirement, avoiding any risk of compromising the appliance safety.
— If the appliance should be definitively disconnected, remove or cut off any potential dangerous
item.
— When selling the appliance or leaving it installed after a removal, make always sure that the
instructions manual is close to the boiler for the future use of new owners and/or installers.
— This appliance must be used for its clearly recommended utilization only. Any other utilization
must be considered dangerous and incorrect.
— It is strictly forbidden to use the appliance for different purposes than the specified ones.
— This appliance must be installed exclusively to wall.
The condensing boiler
We would like to introduce, directly to the end user but giving useful directions also to the Techni-
cian, the main features on the boilers which use the CONDENSING innovative technology: your
HERMANN EURA Condensing. In this booklet you will find also the instruction for the installation,
the conduction and the maintenance of the parts, which are stricly connected with the condens.
The combustion, which is the chemical reaction between the combustible (i.e. natural gas) and a
burning (air), which produces heat and creates carbon dioxide (CO2), water (water- steam) and
traces of carbon monoxide (CO), azote oxide (NOx) and incombustible.
As we know, to transform 1 Kg of water in vapour it is required about 0,7 KWh, keeping into
consideration that 1 m3 of natural gas produces about 1,6 Kg of water, and it is clear that you lose
1,12 KWh only to transform water in vapour without having the need.
The condensing boiler, despite the traditional boilers, make it possible to regain a part of this
energy condensing the water steam contained in the flues. So the regained energy will be as
bigger as the returned temperature from the heating system is lower, and it is for this reason that
the condensing boiler is perfect if it is combined with heating systems with radiant panels.
Therefore the technology of the condensing boilers, despite the traditional boilers, is now the
winner answer to the problematic of the environment respect and energy saving connected to
the domestic heating, because they are able to use the combustion gas with efficiencies much
higher ( that is, with a parity of produced heat, they have a lower gas consumption) and their
outlet flues contain (always with a parity of produced heat) a lower quantity of toxicant sub-
stances for the environment.
The condensing boilers are suitable to be applyed in the main cases with few system differences in
respect of the traditional boilers.

6
for the technician and for the user
Introduction
THE ADVANTAGES FOR THE ENVIROMENT
Despite of the traditional boilers, the condens-
ing boilers are able to regain and to use a
part of the outlet heat, as you can see on the
facilitated scheme.
The outlet flues which are normally expelled at
high temperature in the environment, in the con-
densing boilers are used in order to foreheat
before the water which enters the boiler, obvi-
ously without getting in touch with it. It follows
that you need less gas to have the desired heat-
ing temperature and that the flues will be colder
because they have given a part of their heat to
the water. This will lead to the limitation of the
pollution, which together with the “glass effect”
is responsible of the climatic changes which
threaten the world.
THE OUTLET CONDENSE
There are laws and rules (such us the UNI 11071
for Italy) which establish the correct solutions to
realise a simple expelling system. We leave to
the professionality of the installers the details in
order to project a system which completely cor-
respond to the rules and to the National and Lo-
cal Rules.
To install a condensing boiler it is necessary
to include an outlet duct for the condense,
acids resistant for the all length (in a suit-
able plastic material, Ø internal 13 mm minimum).
The connection point between the outlet con-
dense of the boiler and the condense duct has to be inspected, so an ideal solution is to connect it
to a funnel to be used also for the safety valve. This duct must reach the expelling system of the
domestic flowing backs (the sewage), with a minimum slope established by the laws and without
the stagnation points, without reductions, which could limit the flow or tracts where the freezing is
possible. However all the distance covered by the condense should be acids resistant.
The evacuation system of the condense must prevent combustion products leakage. There-
fore, condensing boilers must feature a device which perform this function (usually a syphon trap
which must be firstly filled with water). The EURA Condensing is equipped with a special device
which works dry also, limiting almost completely this risk, although the seal is guaranteed only
when it’s filled with liquid.
FLUEFLUE
FLUE
HEAT from
combustion
HEAT from
condensation
HEAT from
combustion
HEAT
available
TRADITIONAL
BOILER
CONDENSING
BOILER
HEAT
available
burner
burner
condense
conden-
ser
GAS GAS
789_1_R00

7
for the technician and for the user
Introduction
To be much more synthetic in realizing the system, we have noticed that the condense (acid
condense), combined with the domestic flowing backs (basic liquids) tends to neutralize the pH
of the domestic evacuations, giving them a “better” impact on the environment or in any case
provoking a negligible effect because of the dilution. The normal domestic outlet is sufficient to
optimise this equilibrium without any chemical treatments are required (the detergent wa-
ters , which are wasted washing the dishes after a bath/shower etc.)
Only if the boiler is used where the production of flowing backs (basic liquids) is not sufficient
(i.e. office rooms with less then 10 persons), an installation of a condense neutralisator is
required (that is a device which neutralize the pH of the condenses, raising it up). These devices
need periodical maintenance to be executed following their producer’s instructions.
THE FLUE OUTLET
Also the flue outlet of the condensing boilers, is ruled by dedicated laws (i.e. the UNI 11071). Since
the acid condense tends to form itself also inside the flue components, these should be suitable to
reach the purpose. It is mandatory and necessary to use original flue components, espe-
cially designed for EURA Condensing and properly signed, to realize the outlet duct, be-
cause they are integral part of the same component. See“Chimney connections”for further
details about it.
Without being much more detailed, the outlet duct must have an upwards slope (relatively to the
direction of the flues) so as to take the condense towards the boiler (despite of the traditional
sealed combustion chamber boilers and forced draught boilers, the condensing boiler is projected
to work in “wet” conditions) and however must not have stagnation points and traces where it can
freeze. In case where the condense stagnation is unavoidable, this must be drained by the proper
mechanism to be connected to the expelling condense system produced by the boiler and which
prevents the flues passage. Like the normal sealed combustion chamber boilers, it is always
mandatory to use the upwards slope for the horizontal tracts of the aspiration duct, in case
of separated outlets (concerning the direction of the inlet air flow), so as to avoid water raining
inlet in the combustion chamber of the boiler.

8
Technical data
for the technician
TECHNICAL DATA
ATADLACINHCET .M.UgnisnednoCARUE
noitacifitrecEC °n2173OB4960
ssalC
I H2
epyT
38C36C35C34C33C31C
epytsaG 02G
)iH(tupnitaehxaM Wk0.62
)iH(tupnitaehniM Wk5.7
*C°08/°06)iH(.tuptuotaehxaM Wk0.52
*C°08/°06)iH(tuptuotaehniM Wk2.7
**C°05/°03)iH(.tuptuotaehxaM Wk6.72
**C°05/°03)iH(tuptuotaehniM Wk7.7
ON
x
ssalC 5
ONdethgieW
x
hWk/gm6.54
tupnilanimontaOC mpp0.68
tupnidecudertaOC mpp0.21
OC
2
tupnilanimonta %01.9
OC
2
tupnidecuderta %09.8
)**C°05/°03ta(nQtaytitnauqesnednoC h/l00.3
)**C°05/°03ta(rQtaytitnauqesnednoC h/l46.0
ytidicaesnednoC Hp09.2
YCNEICIFFE
*C°08/°06taycneiciffelanimoN %3.89
*C°08/°06tadaol%03taycneiciffE %2.001
**C°05/°03taycneiciffelanimoN %7.601
**C°05/°03tadaol%03taycneiciffE %8.601
GNITAEH
)xam÷nim(tiucricgnitaehniaMniegnarnoitceleserutarepmeT
egnarerutarepmetwol/egnarlamron C°54÷02/08÷03
)xam÷nim(tiucricgnitaehyradnoceSniegnarnoitceleserutarepmeT C°08÷02
lessevnoisnapxE l8
erusserplessevnoisnapxE rab1
erusserpgnikrowxaM rab3
erutarepmetmetsysxaM C°58
erutarepmetffo/nonoitcnufezeerfitnA C°03/5
RETAWTOH
esirerutarepmetC°03taetarwolF nim/l0.21
wolfretawniM nim/l6.2
erusserpylppusxaM rab6
)hctiwsytiroirpehtfonoitavitcaehtrof(erusserpylppusniM rab4.0
)xam÷nim(egnarnoitceleserutarepmeT C°55÷03
)retawtoh/gnitaeh(yticapacknatiniM l9.0/2.3
erutarepmetffo/nonoitcnufezeerfitnA C°05/5
ATADLACIRTCELE
ycneuqerf/egatloV zH/V05/032
noitpmusnocrewoP W591
noitcetorpfoleveL D4XPI
SNOISNEMID
htpeD-thgieH-htdiW mm margaid"SNOISNEMID"otrefeR
)egakcapfothgiew(retawtuohtiwreliobfothgieW gk)4(05
)teltuO=S(SNOITCENNOC
nruter/wolfgnitaeH cnI"¾
teltuo/telniretaWcitsemoD cnI"½
reliobehtotnoitcennocsaG cnI"¾
tiknoitcennocdradnatsfokcocsagehtotnoitcennocsaG cnI"½
Øtelniria/teltuostcudorpeulflaixaoC mm06/001
xam÷nim)latnoziroh(htgneleulflaixaoC m01÷1
xam÷nim)lacitrev(htgneleulflaixaoC m11÷1
Øtelniria/teltuostcudorpeulfetarapeS mm06
xam÷nim)latnoziroh(htgneleulfmm06ØetarapeS m)9=Sxam(81÷2
xam÷nim)lacitrev(htgneleulfmm06ØetarapeS m)01=Sxam(02÷2
ERUSSERPYLPPUSSAG
epytsaG 02G
erusserplanimoN rabm02
retemaidrotcejnI mm9.5
NOITPMUSNOCSAG
xamQ h/cm57.2
nimQ h/cm97.0
* = with a temperature of the reflowing water that DOES NOT allow condensing;
** = with a temperature of the reflowing water that allows condensing

9
Dati tecnici
Technical data
for the technician
DIMENSIONS
241 209
274
189
326 124
1
2
3
450 377
833
209
241 189
1teltuostcudorpeulF
2metsyslaixaocroftelniriA
3metsysetarapesroftelniriA

10
Technical data
for the technician
AVAILABLE PUMP CAPACITY
EURA CONDENSING
pump speed selector on position I, II and III (automatic by-pass)
Pressure m. H2O
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
5,5
6,5
7
7,5
6
0 200 400 1000 1200600 800 1400 1600
790
R00
Water flow l/h
excluded by-pass
automatic by-pass

11
Dati tecnici
Technical data
for the technician
BOILER SCHEMATIC
WARNING: This scheme is made for in-
formation only. To make boiler hydrau-
lic connection either use fixing jig or the
drawing inserted in the section “Instal-
lation”.
1 Drain valve
2 Manometer
3 By-pass
4 Three way motorised valve
5 Loss of water switch
6 Heating system safety valve 3 bar
7 Pump
8 Expansion vessel
9 Flow temperature sensor
10 Primary exchanger
(condensing sector)
11 High temperature safety switch
12 Automatic air vent
13 Flue conveyor
14 Sealed combustion chamber
15 Combustion chamber
16 Burner
17 Primary exchanger
(combustion chamber)
18 Gas injector
19 Gas/air melting system
20 Ventilator
21 Outlet condense of the condensing group
22 Seal outlet too full
23 Condense syphon with safety float
24 Domestic heat exchanger
25 Gas valve
26 Motorised mixing valve
27 Priority flowstat
28 Electric filling valve
29 Domestic minitank temperature sensor
30 Domestic minitank automatic air vent
31 Safety thermostat on system return
(manual reset)
2
1
7
4
3
5
6
8
9
29
30
11
12
10
13
14
15
16
17
18
20
21
24
25
26
27
28
23
19
22
31
DOMESTIC
WATER
INLET
HEATING
FLOW
OUTLET
RETURN
CONDENSE
OUTLET
GAS

12
Installation
for the technician
INSTALLATION
Safety laws and rules referred to technicians
assigned to boilers installation
Place here all necessary
advices according to national rules
about WORK SAFETY
Exemple:
Law number XXXX
“Actuation of 89/391/CEE; 89/655/CEE, 90/296/CEE, 90/934/CEE, 90/679/CEE, (work safety)”
Law number XXXX
“Actuation of 89/686/CEE (21 Dec 1989)”
Other Law number XXXX (if any)
“Other Law title and/or brief description”
Directives
“Directive title and/or brief description”
Always proceed with caution when handling the boiler and carrying out instal-
lation/maintenance work as metal parts may cause injuries such as cuts and
abrasions. Wear gloves while doing the above mentioned operations.
Reference norms and laws
for installation
Place here all necessary
advices according to national rules
about BOILER INSTALLATION
Exemple:
Rule UNI 11071
“Domestic gas plants for condensing devices and similars”.
Rule UNI EN 677 – Boilers with centralized heating system provided with gaseous flues
“Specific requirements for condensing boilers with thermic rate not bigger than 70 KW”.
Law number XXXX
“Law title and/or brief description”

13
Installation
for the technician
Boiler location
INSTALLATION ROOM
When having an heat ouput lower than 35 kw (about 30000 Kcal/h), particular features for the
installation room are not required. Shortly, all installation rules assuring a safe and regular gas
boiler operation, must be strictly respected.
Place here all necessary
advices according to national rules about:
- Installation room requirements
- Limitations in power and/or number of boilers and other appli-
ances in the same room
Exemple:
Law number XXXX
“Law title and/or brief description”
INSTALLATION IN ROOMS WHERE TEMPERATURE CAN DROP DOWN TO 0°C:
The gas boiler is homologated for indoor installation, and it must be completely protected against
atmospheric agents with a suitable cover.
In case of boiler installation in rooms where temperature can drop down to 0°, it is advisable to
protect the heating circuit with an antifreeze liquid. See the “System Filling” section.
ROOM VENTILATION (EURA EEURA E
EURA EEURA E
EURA E - natural draught)
When a natural draught boiler is installed, permanent ventilation of the installation
room is mandatory and extremely important. Ventilation must be made and sized in
accordance with Laws and Rules in force.
The syphon outlet too full
Before installing the boiler, you must evaluate the opportunity to use the too full outlet of the seal.
This safety outlet (particular 26 in the picture “Boiler internal components”) saves the burner in the
rare case where the condense is not able to flow down correctly from the seal. This outlet is built
closed by the producers. If you desire to use it , take off the tap, connect a treat of flexible duct
suitable for the condense and insert it, avoiding foldings and throating, in a suitable outlet, for
example the funnel of the condense outlet or of the safety valve.
In alternative, although it is not advisable, you can simply take off the tap and leave free the too full
outlet. The burner won’t be damaged if accidentally the seal is blocked, but the condense will be
flowed in the environment. Keep in mind that the condense acidity could damage the surface with
which it gets in touch.

14
Installation
for the technician
Fixing the boiler
For the installation proceed as follows:
Appliance size and clearances for maintenance: 50mm from both sides and 300mm from the
bottom are reccommended.
— Attach template to the wall (see figure below) with two brackets suitable to carry boiler weight;
— fix up electrical connections and all ducts for heating flow and return, cold water, hot water and
gas, as indicated on template;
— remove template and hang boiler;
Remark: The template is only used as a guide to align the pipework.
—remove plastic caps and their relevant gaskets from boiler connections. Remove bottom
plastic supports by unscrewing their relevant screws. Keep these screws since you will need
them to install bottom grid;
Remark: We suggest not to fix grid until the boiler is definitively commissioned.
— Connect boiler to the pipework installing a cold
water inlet cock. We also suggest to install
cocks on heating flow and return.
Boiler template
Adviced zone for
condense outlet
Alternative zone for
condense outlet in the
safety valve funnel
Gas (3/4” on the boiler,
1/2” facing the wall with the gas
cock supplied with the standard kit)
Hot water OUTLET (1/2")
Cold water INLET (1/2")
Heating RETURN (3/4")
Heating FLOW (3/4")
Electrical power supply
Room thermostat(s)

15
Installation
for the technician
CONNECTION EXEMPLE
Hydraulic connections
Remark: If gas cock position is foreseen near the
WALL, install first gas cock, then water inlet
tap.
Advices and suggestions to avoid vibrations and
noises in the system
— Do not use pipes with reduced diameters;
— Do not use bends with small radius and reduc-
tions of important sections;
—
It is recommended an hot washing of the
system in order to purge the pipes and the
radiators from impurities (in particular oils and
fats) that could damage the pump.
DOMESTIC WATER SUPPLY
The pressure of entrance cold water inlet pressure must be lower than 6 bar. Furthermore, for an
optimal boiler functioning, water pressure should be more than 1 bar. A lower pressure could make
difficult to restore correctly the pressure in the heating system, and reduce the flow od hot water
available from the boiler.
If pressure is higher, a PRESSURE REDUCER must be fitted upstream the boiler.
The cleaning frequency of the coil exchanger depends on the water supply hardness. Besides, the
presence of solid residuals or impurities in the water (for example in case of new systems) could
compromise the correct functioning of the boiler.
So, may be necessary to install suitable water treatment device, depending on the water features.
HEATING SYSTEM
— Considering that during boiler operation, the water inside the heating system increases its
pressure, make sure that its maximum value does not exceed the maximum hydraulic pressure
indicated on the appliance data plate.
— Connect the safety evacuation ducts of the boiler to an evacuation funnel. If safety valves are
not connected to an evacuation device, their intervention could flood the room. Hermann can-
not be held responsible for any damage arising from that situation.
Make sure that the hydraulic and heating systems ducts are not used as earth con-
nections of the electrical system.They are absolutely NOT SUITABLE for such a use.

16
Installation
for the technician
627
BOILER BOTTOM VIEW
1
2
CONDENSE OUTLET
Insert the flexible pipe of condense outlet inside the outlet funnel (or other fitting inspectable
mechanism) properly adapted as foreseen by UNI EN 677, or in the outlet funnel of the safety
valve, in case of the above mentioned outlet is able to receive the acid liquids of the condense as
foreseen by UNI EN 677 and/or UNI 11071.
The system must be realized in order to avoid the condense freezing. Before the activation of the
appliance be sure that the condense can be evacuated correctly.
System filling
Once the boiler is hydraulically connected, it is possible to fill the system.
Warning: if boiler is installed in a room where temperature can drop below 0°C, it is recom-
mended to fill the heating system with an anti freezing mixture.
While filling, please follow carefully the following
phases:
— Open air vent in radiators;
— open filling tap;
— slowly unscrew screw [2] located in water filling
electro-valve, from position “C” to position “A” (see
picture), taking care of all air vent installed in the
system;
— as soon as water flows out of air vent radiators,
close air vents;
— check on the manometer [1] that pressure reaches
the optimal value of 1÷1.5 bar (minimum: 0.5 bar),
then reset screw [2] in position “C” (closed);
— repeat previous operations until all air in the sys-
tem has been blown out.
Note: Boiler is equipped with a special automatic fill-
ing device, which automatically fills boiler to reset
its pressure provided that boiler is electrically fed.

17
Installation
for the technician
Gas connection
Remark: If gas cock position is foreseen near the WALL,
install first gas cock, then water inlet tap.
Boiler installation must be carried out from a qualified
technician, [exemple: as indicated by the Law XXXXX]
because an incorrect installation can cause damages to
people, animals or things, for which the manufacturer
cannot be held responsible.
Verify what follows:
a) cleaning of all system gas pipes in order to avoid the
presence of residual combustion products that could
compromise the correct boiler functioning;
b) gas line and ramp conformity with laws and rules actually in force (exemple: Laws UNI-CIG
7129/01, 7131/99 - DM 12/04/96);
c) internal and external tightness of the gas system and connections;
d) supply pipe must have a section greater than or equal to the boiler one;
e) an interception valve must be installed upstream the appliance;
Open the meter valve and purge the air that is inside the system pipes (including all the appli-
ances).
While connecting gas inlet pipe of the boiler to the pipe coming from gas network, it is
MANDATORY to insert a TIGHT GASKET, whose dimensions and material must be
adequate. Connection is NOT suitable for hemp, teflon strip or similar materials.
Electrical connections
GENERAL WARNINGS
The cable for electrical supply must be connected to an electrical line of 230V-50Hz, respecting the
polarities L-N (Live-Neutral) and the earth connection.
PLACE UPSTREAM THE BOILER A BIPOLAR SWITCH in accordance with the rules
actually in force.
For the general electrical supply of the appliance, the use of adaptors, multiple taps and extensions
is not allowed.
It is mandatory the earth connection in accordance with the CEI rules actually in force.
ESEMPIO DI COLLEGAMENTO

18
Installation
for the technician
Electrical safety of the appliance is only achieved when it is well connected to an
efficient earthing system, executed as indicated by the safety rules actually in force.
A qualified technician must check that the electrical system is in line with the maximum power
allowed by the boiler, indicated on the data plate, with particular attention to the cables section.
Remark: HERMANN Ltd. declines any responsibility for damages to persons, animals or
things caused by the non-connection of the boiler earthing and by failure to comply with
the rules.
ELECTRICAL CONNECTIONS TOTHE BOILER
— Unscrew the two screws [1] and remove cover [2];
— extract yellow and white connectors;
— make electric connections as shown in the picture
situated on the other side of the cover:
• connect earth wire to yellow connector;
• connect NEUTRAL cable (N) and PHASE (L)
to WHITE connector, precisely as shown in
the picture;
If PHASE and NEUTRAL wires are reversed,
the boiler will not work.
• when a Room Thermostat or commercial
Chrono Thermostat (TA, principal) and/or Out-
door Temperature Probe (SE) are foreseen,
unplug GREEN connector from PCB and
make connections as shown in the picture. If
TA is installed, disconnect jumper [X].
• If you foreseen to install a room thermostat
(or a commercial cronothermostat) SECOND-
ARY (TA2) and/or the safety thermostat for
low temperature floor heating system (TP)
connect them to the connector M19 directly
on the modulation board (see the “Electrical
Schedule”). The connector M19 is located
between the green connector TA-SE (M10) a
the connector of the electrical supply L-N
(M11).
In the paragraph “System with secondary zone” you will find an example of installation
with zone at high and low temperature, using the optional kit Hermann.
123 4
TA
X
SE
642_R01
LN

19
Installation
for the technician
TA, TA2, SE and TP terminals work at safety extra low voltage (SELV): only connect NON
POWERED wires coming from simple contact of Thermostat / Chrono Thermostat, and/or
Outdoor Temperature Probe. DO NOT connect live wires, for any reason.
Original Hermann remote control (optional kit) must NOT be connected to green connector.
Special interface card, supplied in the remote control kit, must be used.
All low-voltage wirings (e.g. TA, SE and original Hermann remote control) must be kept
separate from power supply cables, as to avoid boiler malfunctionings due to electrical
noise. It is advisable to use separate tubes for them.
— all the relevant connections must be inserted in modulation PCB, FOLLOWING THE COR-
RECT COLOURS. They have been provided with special plugs for correctly connect them.
— close cover inserting cables in the provided holes [3] and screw the screws [1];
— block cables with the special device [4].
Connections to the chimney
EURA Condensing
MAIN INDICATIONS TO INSTALL INLET AND OUTLET DUCTS
To grant the functionality and efficiency of the appliance it is indispensable to realize inlet and
outlet ducts using original flue accessories, specific for condensing boilers, and duly signed.
WARNING: the specific flue accessories components for condensing boilers, especially the
parts which are in touch with the flues inlet, are so projected because they are made with
plastic materials acids resistant, but because of their nature, they are not suitable to
resist to the higher temperature of the flues of the traditional boilers.So it is not possible
to use traditional flue components for the outlet ducts of the condensing boilers,
neither vice versa.
If it is possible, we recommend to foreseen (refferring to the direction of the air/flue) an upwards
slope for all the inlet and outlet ducts, in order to:
— PREVENT the water or dust or other objects entrance inside the INLET duct. In case of coaxial
ducts, use the special horizontal terminal, which is especially built to respect these slopes only
for the first tract of the inlet duct;
— TO FACILITATE, in the OUTLET duct, the flowing back of the condense towards the combus-
tion chamber, which is built to work in these conditions and to discharge the condense. If so it
is not possible, or if there are some points where the condense stagnates inside the outlet duct
and if it is not possible to avoid this through a modification of the slope of the ducts, these
points must be drained using the specific kit of condense collector (consult the commercial
catalogues of the original accessories), and ducting the condense formed towards the outlet
duct as indicated in the UNI 11071.

20
Installation
for the technician
797R02
1
S
S
AA
A+S
A S A
S S
23
4
6 7
5
We give you some correct and wrong examples of installation of inlet and outlet duct (the slope
are voluntarily represented in an exaggerated way).
A= Inlet; S= Outlet. 1: the most functional and economic solution is to let the condense come
back towards the boiler. 2-3: if an obstacle prevents to install the ducts upwards, it is necessary
to install condense collectors, so as to avoid stagnations. 4: the slope upwards of the inlet
ducts, for their all length or at least only for the external tract, is sufficient to prevent that the rain
water reaches the combustion chamber. 5: so the inlet must not be downwards. 6: do not let the
condense go out from the flue outlet terminal. 7: the coaxial inlet/outlet duct must be installed
so as the flues are upwards, and so the condense discharge itself towards the boiler. The
terminal tract with inlet head and outside with an outlet out axis must be horizontal placed and
it is equipped with ribs which prevents the water entrance in the external inlet duct.The internal
outlet duct is upwards and canalises the condense in the correct direction.