Unical S 24 User manual

ENGLISH
INSTALLATION AND SERVICING MANUAL
S 24 - S 28 - S 35
+ TOUCH CONTROL Uy BOX integrate
Библиотека СОК 

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Provisions for proper disposal of the product in accordance with Directive 2002/96/EC
At the end of its life cycle the product must not be disposed of as urban waste. It can be taken to
a special recycling centre managed by the local authorities, or to a dealer who o󰀨ers this service.
Separate disposal of a domestic appliance avoids possible negative consequences for the
environment and human health deriving from inappropriate waste handling and allows the recovery
of the materials of which it is made, in order to obtain signicant energy and resource savings.
http://www.unicalag.it/prodotti/domestico-50/condensazione-gas/osa/1635/osa-s

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Technical Features General information
Maintenance instructions Installation Instructions
ENGLISH
Attention: this manual contains instructions for the exclusive use of the professionally qualied installer
and/or maintenance technician in compliance with current legislation.
The user is NOT qualied to intervene on the boiler.
The manufacturer will not be held liable in case of damage to persons, animals or objects resulting from
failure to comply with the instructions contained in the manuals supplied with the boiler.
2 TECHNICAL FEATURES AND DIMENSIONS ..............................................................................................9
2.1 Technical features ...................................................................................................................................9
2.2 Main components view and dimensions ..................................................................................................9
2.3 Available ow rate / pressure diagram ..................................................................................................14
2.4 Operation data .......................................................................................................................................15
2.4.1 Data according to directive ErP ....................................................................................................15
2.4.2 Caratteristiche del controllo integrato Uy BOX ...........................................................................15
2.5 General features .............................................................................................................................15
4 MAINTENANCE INSTRUCTIONS ............................................................................................................... 32
4.1 Inspection and maintenance instructions .............................................................................................. 32
4.1.1 Pannello comandi Uy BOX .........................................................................................................33
4.2 Parameters that can be edited from the control panel ..........................................................................35
4.3 Adaptation of the power to the heating system ..................................................................................... 38
4.3.1 GAC adjustment ..........................................................................................................................39
4.4 Wiring diagram ................................................................................................................................ 43
4.5 Error Code .............................................................................................................................................44
4.5.1 Filling system ................................................................................................................................47
4.6 Important Note .......................................................................................................................................48
4.6.1 Service panel ................................................................................................................................49
3 INSTALLATION INSTRUCTIONS ................................................................................................................16
3.1 General warnings ..................................................................................................................................16
3.2 Installation standards ............................................................................................................................16
3.3 Preventive system verication and adjustment operations ...................................................................16
3.4 Packaging ..............................................................................................................................................17
3.4 Positioning the boiler .............................................................................................................................18
3.6 Flue gas exhaust pipe connection .........................................................................................................19
3.7 Connections ..........................................................................................................................................22
3.8 Filling the system ...................................................................................................................................23
3.9 Electrical connections ............................................................................................................................24
3.10 Commissioning ................................................................................................................................... 26
3.11 Measurement of combustion e󰀩ciency during installation ....................................................................27
3.11.1 Calibration function activation ................................................................................................... 27
3.11.2 Probes positioning ....................................................................................................................28
3.12 Burner adjustment .................................................................................................................................29
3.12.1 Combustion adjustment function activation ..............................................................................30
3.12.3 Adaptation of the power to the heating system .........................................................................31
1 GENERAL INFORMATION .............................................................................................................................4
1.1 General warnings ....................................................................................................................................4
1.2 Symbols used in the manual ...................................................................................................................5
1.3 Appropriate use of appliance ...................................................................................................................5
1.4 Information for system manager ..............................................................................................................5
1.5 Safety warnings .......................................................................................................................................6
1.6 Technical data plate ................................................................................................................................ 7
1.7 Water treatment .......................................................................................................................................8
1.8 Boiler antifreeze protection ......................................................................................................................8

4
1GENERAL INFORMATION
In the event of failure and/or malfunctioning of the
appliance, switch it o󰀨 and do not try to repair it or
intervene on it directly. Contact only personnel qual-
ied in compliance with law.
Any repairs must be performed solely by personnel
authorised by Unical AG S.p.A., using original spare
parts only. Failure to comply with the above can com-
promise the safety of the boiler and void the warranty.
To guarantee appliance e󰀩ciency and its correct
operation, yearly maintenance must be performed
by qualied personnel.
Should you decide not to use the appliance, parts
entailing potential sources of hazard must be made
safe.
Before commissioning an appliance that has not
been used, wash the domestic hot water production
system, making the water ow until it has been fully
replaced.
Should the appliance be sold or transferred to a new
owner or if you move and leave the appliance, always
make sure that the instruction booklet accompanies
it in order to be consulted by the new owner and/or
installer.
Only original accessories must be used for all appli-
ances with optionals or kits (including electric).
This boiler is intended solely for the use for which it
was expressly designed.
Any other use is to be considered improper and
therefore dangerous (*).
1.1 - GENERAL WARNINGS
The instruction booklet is an integral and essential
part of the product and must be kept by the user.
Read the warnings contained in this instruction
booklet carefully as they provide important guidelines
regarding installation, use and maintenance safety.
Keep the booklet with care for further consultation.
Installation and maintenance must be performed
in compliance with the standards in force ac-
cording to the instructions of the manufacturer,
up to standard and by personnel qualied and
certied in compliance with law.
Systems for the production of domestic hot wa-
ter MUST be constructed entirely with compliant
materials.
By professionally qualied personnel we mean:
personnel with specic technical skill in the eld
of heating system components for civil use, do-
mestic hot water production and maintenance.
Personnel must have the qualications provided
for by current legislation.
Incorrect installation or improper maintenance
can causedamage to persons, animalsor objects
for which the manufacturer is not responsible.
Before performing any cleaning or maintenance,
disconnect the appliance from the energy mains by
acting on the switch of the system and/or through
the specic cut-o󰀨 devices.
Do not obstruct the terminals of the intake/exhaust
ducts.

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1.2 - SYMBOLS USED IN THE MANUAL
Pay special attention when reading this manual to the parts marked by the symbols:
NOTE!
Tips
for the user
ATTENTION!
Possible dangerous
situation for the product
and the environment
DANGER!
Serious danger
to safety
and health
1.3 - APPROPRIATE USE OF APPLIANCE
The boiler has been built according to the current level of engineering and acknowledged
technical safety rules.
Nonetheless, if improperly used, dangers could arise for the safety and life of the user
and other persons or damage to the equipment or other objects.
The appliance is designed to work in heating systems, with hot water circulation, for
the production of domestic hot water.
Any other use is considered improper.
Unical AG S.p.A. will not be held liable for any damage resulting from improper use.
Use according to the intended purposes also includes strict compliance with the in-
structions in this manual.
The user must be instructed concerning the use and operation of his heating system, in particular:
• Deliver these instructions to the user, as well as other documents concerning the appliance
inserted in the envelope inside the packaging. The user must keep this documentation
safe for future consultation.
• Inform the user about the importance of the air vents and the ue gas exhaust system, high-
lighting their essential features and the absolute prohibition of modifying them.
• Inform the user concerning controlling the system's water pressure as well as operations to
restore it.
• Inform the user concerning correct temperature control, control units/thermostats and radiators
for saving energy.
• Please note that, in compliance with the standards in force, the inspection and maintenance of
the appliance must be carried out in compliance with the regulations and frequency indicated
by the manufacturer.
• Should the appliance be sold or transferred to a new owner or if you move and leave the ap-
pliance, always make sure that the instruction booklet accompanies it in order to be consulted
by the new owner and/or installer.
The manufacturer will not be held liable in the event of damage to persons, animals or
objects resulting from failure to comply with the instructions contained in this manual.
1.4 - INFORMATION PROVIDED TO THE USER
NOTE!
For more information
See Technical Info:
from site indicated at pag. 2

6
1.5 - SAFETY WARNINGS
ATTENTION!
The boiler cannot be used by children.
The boiler can be used by adults and only after having carefully read the user’s ma-
nual. Children should be supervised to ensure that they do not play or tamper with
the device.
ATTENTION!
The appliance must be installed, adjusted and maintained by professionally qualied
personnel, in compliance with the standards and provisions in force. Incorrect instal-
lation can cause damage to persons, animals and objects for which the manufacturer
cannot be held responsible.
DANGER!
NEVER attempt performing maintenance or repairs on the boiler on your own initiative.
Any work must be done by professionally qualied personnel. We recommend stipulat-
ing a maintenance contract.
Insu󰀩cient or irregular maintenance can jeopardise the operating safety of the appli-
ance and cause damage to persons, animals and objects for which the manufacturer
cannot be held responsible.
Changes to the parts connected to the appliance (once the appliance installation is complete)
Do not modify the following parts:
- the boiler
- the gas, air, water and electricity supply lines
- the ue gas pipe, the safety valve and the exhaust pipe
- the construction parts which a󰀨ect the operating safety of the appliance
Attention!
To tighten or loosen the screwed ttings, use only appropriate xed spanners.
Incompliant use and/or inappropriate tools can cause damage (e.g. water or gas leakage).
ATTENTION!
Indications for propane gas-red appliances
Make sure that the gas tank has been deaerated before installing the appliance.
For state-of-the-art tank venting, contact the LPG supplier or person qualied in compliance
with the law requirement.
If the tank has not been professionally deaerated, ignition problems could arise.
In that case, contact the supplier of the LPG tank.
Smell of gas
Should a smell of gas be perceived, follow these safety guidelines:
- do not turn electric switches on or o󰀨
- do not smoke
- do not use the telephone
- close the gas shut-o󰀨 valve
- air out the area where the gas leakage has occurred
- inform the gas supplier or a company specialised in installation and maintenance of heating
systems.
Explosive and easily ammable substances
Do not use or store explosive or easily ammable materials (e.g. petrol, paints, paper) in the
room where the appliance is installed.
DANGER!
Do not use the appliance as a supporting base for objects.
In particular, do not place receptacles containing liquids (Bottles, Glasses, Jars or Detergents)
on top of the appliance.
If the appliance is installed inside a housing, do not insert or rest other objects inside this housing.

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General information
ENGLISH
1.6 - TECHNICAL DATA PLATE KEY:
1 = CE monitoring body
2 = Type of boiler
3 = Boiler model
4 = Number of stars (directive 92/42 EEC)
5 = (S.N°) Serial Number
6 = P.I.N.ProductIdenticationNumber
7 = Typesofapproveduegasexhaustcongurations
8 = (NOx)NOxClass
A = Heatingcircuitcharacteristics
9 = (Pn) Effective nominal output
10 = (Pcond) Effective output in condensation
11= (Qn)Maximumheatoutput
12= (AdjustedQn)Adjustedforratedheatoutput
13= (PMS)Max.heatingoperatingpressure
14= (Tmax)Max.heatingtemperature
B = Domestichotwatercircuitcharacteristics
15= (Qnw)Ratedheatoutputindomestichotwaterfunction
(if different to Qn)
16= (D)SpecicD.H.W.owrateaccordingtoEN625-EN
13203-1
19= (PMW)Max.domestichotwateroperatingpressure
20= (Tmax)Max.domestichotwatertemperature
C = Electricalcharacteristics
21= Electricalpowersupply
22 = Consumption
23 = Protection rating
D = Countries of destination
24 = Direct and indirect countries of destination
25 = Gas category
26 = Supply pressure
E = Factory settings
27 = Adjusted for gas type X
28 = Space for national brands
G = ErP
29=Seasonalspaceheatingenergyefciency
30 =EnergyefciencyinDHWproductionmode
The rating plate is placed inside the
boiler,
The rating plate DUPLICATE is placed
under the front casing (lower-right).
The CE marking
certies the compliance of the equipment with the
essential safety requirements dened in the directi-
ves and applicable European regulations and that
its functioning satisfy applicable technical stan-
dards.
The CE marking is a󰀩xed to each piece of equip-
ment with an appropriate label.
The CE declaration of conformity issued in accor-
dance with international standards by the manu-
facturer, is placed in documentation envelope sup-
plied with the product.

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(*) The frost protection is always active.
Even disabling the CH and DHW services.
ATTENTION (*) see general warn-
ings 1.1
The heating only models are NOT
suitable for the production of water
for human consumption according
to Ministerial Decree D.M. 174/2004.
ATTENTION!
ANY DAMAGE TO THE BOILER
CAUSED BY THE FORMATION OF
FOULINGORBYCORROSIVEWATER
WILL NOT BE COVERED BY THE
WARRANTY.
1.7 - WATER TREATMENT
The treatment of the supply water
allows to prevent inconveniences
and maintain the functionality and
e󰀩ciency of the generator over time.
The ideal water pH in heating systems
must be within:
To minimise corrosion, it is crucial to
use a corrosion inhibitor; in order for
it to work properly, the metal surfac-
es must be clean.
(see system protection ACCESSO-
RIES sect. in domestic price list)
VALUE MIN MAX
PH 6.5 8
Hardness [°fr] 915
1.8 - BOILER ANTIFREEZE
PROTECTION (*)
P
O
S
ANTIFREEZE FUNCTION
Power supplies 11 - SR (*) Status
function
antifreeze
Actions
Electric Gas
1ON ON < 6 °C ON - Burner and Pump ON until T > 14°C
2ON OFF
< 2 °C ON Only when both the power supplies are ON:
- Burner and Pump OFF until T > 5°C
- When T > 5°C then Burner and Pump
ON until T > 14°C.
OFF ON
OFF OFF
(*) Sensor 11 par. 2.2
This protection can intervene only
i f the electricity and gas supplies are
connected.
I f one of the two is not available and
upon reset 11 (SR) a temperature of
< 2 °C is detected, the appliance will
behave as described in tab. pos 2.
The heating system can be protected
effectively from frost by using
antifreeze products with inhibitor
for heating systems (specific for
multidmetal).
Do not use car engine antifreeze
products as they could damage the
water gaskets.

9
Technical Features
ENGLISH
2
OSA S 24
TECHNICAL FEATURES
AND DIMENSIONS
2.1 - TECHNICAL FEATURES
2.2 - VIEW WITH THE INDICATION OF THE MAIN COMPONENTSAND DIMENSIONS
NOTE!
For more information
See Technical Info
from site indicated at pag. 2

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OSA S 28 - OSA S 35