Unical Osa S 24 Datasheet

ENGLISH
INSTALLATION AND SERVICING MANUAL
S 24
S 28
S 35 728&+&21752/8À\%2;LQWHJUDWH

2
Provisions for proper disposal of the product in accordance with Directive 2002/96/EC
$WWKHHQGRILWVOLIHF\FOHWKHSURGXFWPXVWQRWEHGLVSRVHGRIDVXUEDQZDVWH,WFDQEHWDNHQWRDVSHFLDOUHF\FOLQJFHQWUHPDQDJHGE\WKHORFDODXWKRULWLHVRUWRDGHDOHUZKRRIIHUVWKLVVHUYLFH6HSDUDWHGLVSRVDORIDGRPHVWLFDSSOLDQFHDYRLGVSRVVLEOHQHJDWLYHFRQVHTXHQFHVIRUWKHHQYLURQPHQWDQGKXPDQKHDOWKGHULYLQJIURPLQDSSURSULDWHZDVWHKDQGOLQJDQGDOORZVWKHUHFRYHU\RIWKHPDWHULDOVRIZKLFKLWLVPDGHLQRUGHUWRREWDLQVLJQL¿FDQWHQHUJ\DQGUHVRXUFHVDYLQJVhttp://www.unicalag.it/prodotti/domestico-50/condensazione-gas/osa/1635/osa-s

3
Technical Features General information
Maintenance instructions Installation Instructions
ENGLISH
$WWHQWLRQWKLVPDQXDOFRQWDLQVLQVWUXFWLRQVIRUWKHH[FOXVLYHXVHRIWKHSURIHVVLRQDOO\TXDOL¿HGLQVWDOOHUDQGRUPDLQWHQDQFHWHFKQLFLDQLQFRPSOLDQFHZLWKFXUUHQWOHJLVODWLRQ7KHXVHULV127TXDOL¿HGWRLQWHUYHQHRQWKHERLOHU7KHPDQXIDFWXUHUZLOOQRWEHKHOGOLDEOHLQFDVHRIGDPDJHWRSHUVRQVDQLPDOVRUREMHFWVUHVXOWLQJIURPIDLOXUHWRFRPSO\ZLWKWKHLQVWUXFWLRQVFRQWDLQHGLQWKHPDQXDOVVXSSOLHGZLWKWKHERLOHU27(&+1,&$/)($785(6$1'',0(16,2169
7HFKQLFDOIHDWXUHV9
0DLQFRPSRQHQWVYLHZDQGGLPHQVLRQV9
$YDLODEOHÀRZUDWHSUHVVXUHGLDJUDP2SHUDWLRQGDWD'DWDDFFRUGLQJWRGLUHFWLYH(U3&DUDWWHULVWLFKHGHOFRQWUROORLQWHJUDWR8À\%2;*HQHUDOIHDWXUHV40$,17(1$1&(,16758&7,21632
,QVSHFWLRQDQGPDLQWHQDQFHLQVWUXFWLRQV32
3DQQHOORFRPDQGL8À\%2;33
3DUDPHWHUVWKDWFDQEHHGLWHGIURPWKHFRQWUROSDQHO35
$GDSWDWLRQRIWKHSRZHUWRWKHKHDWLQJV\VWHP38
*$&DGMXVWPHQW39
:LULQJGLDJUDP43
(UURU&RGH44
)LOOLQJV\VWHP47
,PSRUWDQW1RWH48
6HUYLFHSDQHO49
3,167$//$7,21,16758&7,216*HQHUDOZDUQLQJV,QVWDOODWLRQVWDQGDUGV3UHYHQWLYHV\VWHPYHUL¿FDWLRQDQGDGMXVWPHQWRSHUDWLRQV3DFNDJLQJ3RVLWLRQLQJWKHERLOHU)OXHJDVH[KDXVWSLSHFRQQHFWLRQ&RQQHFWLRQV22
)LOOLQJWKHV\VWHP23
(OHFWULFDOFRQQHFWLRQV24
&RPPLVVLRQLQJ0HDVXUHPHQWRIFRPEXVWLRQHI¿FLHQF\GXULQJLQVWDOODWLRQ27
&DOLEUDWLRQIXQFWLRQDFWLYDWLRQ27
3UREHVSRVLWLRQLQJ28
%XUQHUDGMXVWPHQW29
&RPEXVWLRQDGMXVWPHQWIXQFWLRQDFWLYDWLRQ$GDSWDWLRQRIWKHSRZHUWRWKHKHDWLQJV\VWHP*(1(5$/,1)250$7,214
*HQHUDOZDUQLQJV4
6\PEROVXVHGLQWKHPDQXDO5
$SSURSULDWHXVHRIDSSOLDQFH5
,QIRUPDWLRQIRUV\VWHPPDQDJHU5
6DIHW\ZDUQLQJV7HFKQLFDOGDWDSODWH7
:DWHUWUHDWPHQW8
%RLOHUDQWLIUHH]HSURWHFWLRQ8

4
1GENERAL INFORMATION
,QWKHHYHQWRIIDLOXUHDQGRUPDOIXQFWLRQLQJRIWKHDSSOLDQFHVZLWFKLWRIIDQGGRQRWWU\WRUHSDLULWRULQWHUYHQHRQLWGLUHFWO\&RQWDFWRQO\SHUVRQQHOTXDO-
L¿HGLQFRPSOLDQFHZLWKODZ$Q\UHSDLUVPXVWEHSHUIRUPHGVROHO\E\SHUVRQQHODXWKRULVHGE\8QLFDO$*6S$XVLQJRULJLQDOVSDUHSDUWVRQO\)DLOXUHWRFRPSO\ZLWKWKHDERYHFDQFRP-
SURPLVHWKHVDIHW\RIWKHERLOHUDQGYRLGWKHZDUUDQW\7RJXDUDQWHHDSSOLDQFHHI¿FLHQF\DQGLWVFRUUHFWRSHUDWLRQ\HDUO\PDLQWHQDQFHPXVWEHSHUIRUPHGE\TXDOL¿HGSHUVRQQHO6KRXOG\RXGHFLGHQRWWRXVHWKHDSSOLDQFHSDUWVHQWDLOLQJSRWHQWLDOVRXUFHVRIKD]DUGPXVWEHPDGHVDIH%HIRUHFRPPLVVLRQLQJDQDSSOLDQFHWKDWKDVQRWEHHQXVHGZDVKWKHGRPHVWLFKRWZDWHUSURGXFWLRQV\VWHPPDNLQJWKHZDWHUÀRZXQWLOLWKDVEHHQIXOO\UHSODFHG6KRXOGWKHDSSOLDQFHEHVROGRUWUDQVIHUUHGWRDQHZRZQHURULI\RXPRYHDQGOHDYHWKHDSSOLDQFHDOZD\VPDNHVXUHWKDWWKHLQVWUXFWLRQERRNOHWDFFRPSDQLHVLWLQRUGHUWREHFRQVXOWHGE\WKHQHZRZQHUDQGRULQVWDOOHU2QO\RULJLQDODFFHVVRULHVPXVWEHXVHGIRUDOODSSOL-
DQFHVZLWKRSWLRQDOVRUNLWVLQFOXGLQJHOHFWULF7KLVERLOHULVLQWHQGHGVROHO\IRUWKHXVHIRUZKLFKLWZDVH[SUHVVO\GHVLJQHG$Q\RWKHUXVHLVWREHFRQVLGHUHGLPSURSHUDQGWKHUHIRUHGDQJHURXV1.1 - GENERAL WARNINGS
7KHLQVWUXFWLRQERRNOHWLVDQLQWHJUDODQGHVVHQWLDOSDUWRIWKHSURGXFWDQGPXVWEHNHSWE\WKHXVHU5HDGWKHZDUQLQJVFRQWDLQHGLQWKLVLQVWUXFWLRQERRNOHWFDUHIXOO\DVWKH\SURYLGHLPSRUWDQWJXLGHOLQHVUHJDUGLQJLQVWDOODWLRQXVHDQGPDLQWHQDQFHVDIHW\.HHSWKHERRNOHWZLWKFDUHIRUIXUWKHUFRQVXOWDWLRQInstallation and maintenance must be performed
in compliance with the standards in force ac-
cording to the instructions of the manufacturer,
XSWRVWDQGDUGDQGE\SHUVRQQHOTXDOL¿HGDQGFHUWL¿HGLQFRPSOLDQFHZLWKODZSystems for the production of domestic hot wa-
ter MUST be constructed entirely with compliant
materials.
%\SURIHVVLRQDOO\TXDOL¿HGSHUVRQQHOZHPHDQSHUVRQQHOZLWKVSHFL¿FWHFKQLFDOVNLOOLQWKH¿HOGof heating system components for civil use, do-
mestic hot water production and maintenance.
3HUVRQQHOPXVWKDYHWKHTXDOL¿FDWLRQVSURYLGHGfor by current legislation.
Incorrect installation or improper maintenance
can cause damage to persons, animals or objects
for which the manufacturer is not responsible.
%HIRUHSHUIRUPLQJDQ\FOHDQLQJRUPDLQWHQDQFHGLVFRQQHFWWKHDSSOLDQFHIURPWKHHQHUJ\PDLQVE\DFWLQJRQWKHVZLWFKRIWKHV\VWHPDQGRUWKURXJKWKHVSHFL¿FFXWRIIGHYLFHV'RQRWREVWUXFWWKHWHUPLQDOVRIWKHLQWDNHH[KDXVWGXFWV

5
1.2 - SYMBOLS USED IN THE MANUAL
3D\VSHFLDODWWHQWLRQZKHQUHDGLQJWKLVPDQXDOWRWKHSDUWVPDUNHGE\WKHV\PEROV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 ERLOHUKDVEHHQEXLOWDFFRUGLQJWRWKHFXUUHQWOHYHORIHQJLQHHULQJDQGDFNQRZOHGJHG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.
7KHDSSOLDQFHLVGHVLJQHGWRZRUNLQKHDWLQJV\VWHPVZLWKKRWZDWHUFLUFXODWLRQIRU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.
7KHXVHUPXVWEHLQVWUXFWHGFRQFHUQLQJWKHXVHDQGRSHUDWLRQRIKLVKHDWLQJV\VWHPLQSDUWLFXODU'HOLYHUWKHVHLQVWUXFWLRQVWRWKHXVHUDVZHOODVRWKHUGRFXPHQWVFRQFHUQLQJWKHDSSOLDQFHLQVHUWHGLQWKHHQYHORSHLQVLGHWKHSDFNDJLQJ7KHXVHUPXVWNHHSWKLVGRFXPHQWDWLRQsafe for future consultation.
,QIRUPWKHXVHUDERXWWKHLPSRUWDQFHRIWKHDLUYHQWVDQGWKHÀXHJDVH[KDXVWV\VWHPKLJK-
OLJKWLQJWKHLUHVVHQWLDOIHDWXUHVDQGWKHDEVROXWHSURKLELWLRQRIPRGLI\LQJWKHP,QIRUPWKHXVHUFRQFHUQLQJFRQWUROOLQJWKHV\VWHPVZDWHUSUHVVXUHDVZHOODVRSHUDWLRQVWRUHVWRUHLW,QIRUPWKHXVHUFRQFHUQLQJFRUUHFWWHPSHUDWXUHFRQWUROFRQWUROXQLWVWKHUPRVWDWVDQGUDGLDWRUVIRUVDYLQJHQHUJ\3OHDVHQRWHWKDWLQFRPSOLDQFHZLWKWKHVWDQGDUGVLQIRUFHWKHLQVSHFWLRQDQGPDLQWHQDQFHRIWKHDSSOLDQFHPXVWEHFDUULHGRXWLQFRPSOLDQFHZLWKWKHUHJXODWLRQVDQGIUHTXHQF\LQGLFDWHGE\WKHPDQXIDFWXUHU6KRXOGWKHDSSOLDQFHEHVROGRUWUDQVIHUUHGWRDQHZRZQHURULI\RXPRYHDQGOHDYHWKHDS-
SOLDQFHDOZD\VPDNHVXUHWKDWWKHLQVWUXFWLRQERRNOHWDFFRPSDQLHVLWLQRUGHUWREHFRQVXOWHGE\WKHQHZRZQHUDQGRULQVWDOOHU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

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!
7KHDSSOLDQFHPXVWEHLQVWDOOHGDGMXVWHGDQGPDLQWDLQHGE\SURIHVVLRQDOO\TXDOL¿HG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.
$Q\ZRUNPXVWEHGRQHE\SURIHVVLRQDOO\TXDOL¿HGSHUVRQQHO:HUHFRPPHQGVWLSXODW-
ing a maintenance contract.
,QVXI¿FLHQWRULUUHJXODUPDLQWHQDQFHFDQMHRSDUGLVHWKHRSHUDWLQJVDIHW\RIWKHDSSOL-
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)
'RQRWPRGLI\WKHIROORZLQJSDUWVWKHERLOHUWKHJDVDLUZDWHUDQGHOHFWULFLW\VXSSO\OLQHVWKHÀXHJDVSLSHWKHVDIHW\YDOYHDQGWKHH[KDXVWSLSHWKHFRQVWUXFWLRQSDUWVZKLFKDIIHFWWKHRSHUDWLQJVDIHW\RIWKHDSSOLDQFHAttention!
7RWLJKWHQRUORRVHQWKHVFUHZHG¿WWLQJVXVHRQO\DSSURSULDWH¿[HGVSDQQHUV,QFRPSOLDQWXVHDQGRULQDSSURSULDWHWRROVFDQFDXVHGDPDJHHJZDWHURUJDVOHDNDJHATTENTION!
,QGLFDWLRQVIRUSURSDQHJDV¿UHGDSSOLDQFHV0DNHVXUHWKDWWKHJDVWDQNKDVEHHQGHDHUDWHGEHIRUHLQVWDOOLQJWKHDSSOLDQFH)RUVWDWHRIWKHDUWWDQNYHQWLQJFRQWDFWWKH/3*VXSSOLHURUSHUVRQTXDOL¿HGLQFRPSOLDQFHZLWKWKHODZUHTXLUHPHQW,IWKHWDQNKDVQRWEHHQSURIHVVLRQDOO\GHDHUDWHGLJQLWLRQSUREOHPVFRXOGDULVH,QWKDWFDVHFRQWDFWWKHVXSSOLHURIWKH/3*WDQNSmell of gas
6KRXOGDVPHOORIJDVEHSHUFHLYHGIROORZWKHVHVDIHW\JXLGHOLQHVGRQRWWXUQHOHFWULFVZLWFKHVRQRURIIGRQRWVPRNHGRQRWXVHWKHWHOHSKRQHFORVHWKHJDVVKXWRIIYDOYHDLURXWWKHDUHDZKHUHWKHJDVOHDNDJHKDVRFFXUUHGLQIRUPWKHJDVVXSSOLHURUDFRPSDQ\VSHFLDOLVHGLQLQVWDOODWLRQDQGPDLQWHQDQFHRIKHDWLQJV\VWHPV([SORVLYHDQGHDVLO\ÀDPPDEOHVXEVWDQFHV'RQRWXVHRUVWRUHH[SORVLYHRUHDVLO\ÀDPPDEOHPDWHULDOVHJSHWUROSDLQWVSDSHULQWKHURRPZKHUHWKHDSSOLDQFHLVLQVWDOOHGDANGER!
'RQRWXVHWKHDSSOLDQFHDVDVXSSRUWLQJEDVHIRUREMHFWV,QSDUWLFXODUGRQRWSODFHUHFHSWDFOHVFRQWDLQLQJOLTXLGV%RWWOHV*ODVVHV-DUVRU'HWHUJHQWVRQWRSRIWKHDSSOLDQFH,IWKHDSSOLDQFHLVLQVWDOOHGLQVLGHDKRXVLQJGRQRWLQVHUWRUUHVWRWKHUREMHFWVLQVLGHWKLVKRXVLQJ

7
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
 3,13URGXFW,GHQWL¿FDWLRQ1XPEHU 7\SHVRIDSSURYHGÀXHJDVH[KDXVWFRQ¿JXUDWLRQV 12[12[&ODVV$ +HDWLQJFLUFXLWFKDUDFWHULVWLFV9 = (Pn) Effective nominal output
10 = (Pcond) Effective output in condensation
 4Q0D[LPXPKHDWRXWSXW $GMXVWHG4Q$GMXVWHGIRUUDWHGKHDWRXWSXW 3060D[KHDWLQJRSHUDWLQJSUHVVXUH 7PD[0D[KHDWLQJWHPSHUDWXUH% 'RPHVWLFKRWZDWHUFLUFXLWFKDUDFWHULVWLFV 4QZ5DWHGKHDWRXWSXWLQGRPHVWLFKRWZDWHUIXQFWLRQ(if different to Qn)
 '6SHFL¿F'+:ÀRZUDWHDFFRUGLQJWR(1(1 30:0D[GRPHVWLFKRWZDWHURSHUDWLQJSUHVVXUH 7PD[0D[GRPHVWLFKRWZDWHUWHPSHUDWXUH& (OHFWULFDOFKDUDFWHULVWLFV (OHFWULFDOSRZHUVXSSO\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
 6HDVRQDOVSDFHKHDWLQJHQHUJ\HI¿FLHQF\ (QHUJ\HI¿FLHQF\LQ'+:SURGXFWLRQPRGHThe rating plate is placed inside the
boiler,
The rating plate DUPLICATE is placed
under the front casing (lower-right).
7KH&(PDUNLQJFHUWL¿HVWKHFRPSOLDQFHRIWKHHTXLSPHQWZLWKWKHHVVHQWLDOVDIHW\UHTXLUHPHQWVGH¿QHGLQWKHGLUHFWL-
YHVDQGDSSOLFDEOH(XURSHDQUHJXODWLRQVDQGWKDWLWVIXQFWLRQLQJVDWLVI\DSSOLFDEOHWHFKQLFDOVWDQ-
GDUGV7KH&(PDUNLQJLVDI¿[HGWRHDFKSLHFHRIHTXLS-
PHQWZLWKDQDSSURSULDWHODEHO7KH&(GHFODUDWLRQRIFRQIRUPLW\LVVXHGLQDFFRU-
GDQFHZLWKLQWHUQDWLRQDOVWDQGDUGVE\WKHPDQX-
IDFWXUHULVSODFHGLQGRFXPHQWDWLRQHQYHORSHVXS-
SOLHGZLWKWKHSURGXFW

87KHIURVWSURWHFWLRQLVDOZD\VDFWLYH(YHQGLVDEOLQJWKH&+DQG'+:VHUYLFHV
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
FOULING OR BY CORROSIVE WATER
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
HI¿FLHQF\RIWKHJHQHUDWRURYHUWLPHThe ideal water pH in heating systems
must be within:
To minimise corrosion, it is crucial to
use a corrosion inhibitor; in order for
LWWRZRUNSURSHUO\WKHPHWDOVXUIDF-
es must be clean.
(see system protection ACCESSO-
RIES sect. in domestic price list)
VALUE 0,10$;3+8
+DUGQHVV>IU@91.8 - BOILER ANTIFREEZE
PROTECTION (*)
P
O
S
ANTIFREEZE FUNCTION
3RZHUVXSSOLHV11 - SR6WDWXVIXQFWLRQDQWLIUHH]H$FWLRQV(OHFWULF*DV1ON ON &ON %XUQHUDQG3XPS21XQWLO7!&2
ON 2))&ON 2QO\ZKHQERWKWKHSRZHUVXSSOLHVDUH21%XUQHUDQG3XPS2))XQWLO7!&:KHQ7!&WKHQ%XUQHUDQG3XPS21XQWLO7!&2))ON
2))2))6HQVRUSDUThis protection can intervene only
i f the electricity and gas supplies are
connected.
,IRQHRIWKHWZRLVQRWDYDLODEOHDQGXSRQUHVHW11 (SR)DWHPSHUDWXUHRI<&LVGHWHFWHGWKHDSSOLDQFHZLOOEHKDYHDVGHVFULEHGLQWDEpos 2.
7KHKHDWLQJV\VWHPFDQEHSURWHFWHGHIIHFWLYHO\IURPIURVWE\XVLQJDQWLIUHH]HSURGXFWVZLWKLQKLELWRUIRUKHDWLQJV\VWHPVVSHFLILFIRUPXOWLGPHWDO'RQRWXVHFDUHQJLQHDQWLIUHH]HSURGXFWVDVWKH\FRXOGGDPDJHWKHZDWHUJDVNHWV

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 COMPONENTS AND DIMENSIONS
NOTE!
For more information
See Technical Info
from site indicated at pag. 2

OSA S 28 - OSA S 35

OSA S 24 - OSA S 28 - OSA S 35
View from above
View from below

KEY
1&(6('HVFULSWLRQGESS 'RPHVWLFKRWZDWHUWHPSHUDWXUHVHQVRU2)/6)ORZVZLWFKZLWKFROGZDWHU¿OWHU39**DVYDOYH4)G(ACC
5,/,JQLWLRQGHWHFWLRQHOHFWURGH5%XUQHU8([SDQVLRQYHVVHOHL TL 6DIHW\WKHUPRVWDW+ESR +HDWLQJWHPSHUDWXUHVHQVRU+W33XPS/S'.:DWHUGH¿FLHQF\SUHVVXUHVZLWFK'LYHUWHUYDOYH3ODWHKHDWH[FKDQJHU)/)+90)DQ6DIHW\YDOYH22 UESRR 5HWXUQWHPSHUDWXUHVHQVRU23 WITLC )OXHJDVFROOHFWRUVDIHW\WKHU-
PRVWDW24 $OXPLQLXP+HDW([FKDQJHU&D-
SDFLWRU25 9HQWYDOYH&RQGHQVDWLRQGUDLQWUDS33 8À\%2;UHWUDFWDEOH34 *DWHZD\H[WHUQDOOLQNV35 (PHUJHQF\SDQHO$YHV&RQQHFWLRQIRUDGGLWLRQDOH[SDQVLRQYHVVHOC'RPHVWLFKRWZDWHURXWOHW*ò**DVLQOHW*ô)&ROGZDWHULQOHW*ò0+HDWLQJV\VWHPÀRZ*ôR+HDWLQJV\VWHPUHWXUQ*ô5F)LOOLQJYDOYH6F%RLOHUGUDLQ6YV6DIHW\YDOYHGUDLQ
Scond &RQGHQVDWLRQGUDLQ8IS6PRNHUHDURXWSXWRSWLRQDO&( (5525&2'(6VHHSDU6( :,5,1*',$*5$0.(<VHHSDU


Technical Features
ENGLISH
MODULATING PUMP
OSA S 24
OSA S 28 - OSA S 35
2.3 - DIAGRAM OF FLOW RATE/PRESSURE AVAILABLE FOR
INSTALLATION
Flow rate (l/h)
Flow rate (l/h)
Avaible Head (m.c.a.) metres of waterAvaible Head (m.c.a.) metres of water
DIAGRAM OF FLOW RATE/PRESSURE AVAILABLE FOR INSTALLATION

2.4 - OPERATING DATA ACCORDING TO UNI 10348
OSA S 24 OSA S 28 OSA S 35
1RPLQDOKHDWLQSXWLQ&+'+:PRGHN:0LQLPXPKHDWLQSXWZLWK1DW*DV3URSDQHN:1RPLQDOKHDWRXWSXWN:0LQLPXPKHDWRXWSXWN:1RPLQDORXWSXWLQFRQGHQVDWLRQ&N:0LQLPXPKHDWRXWSXWLQFRQGHQVDWLRQ&N:&RPEXVWLRQHI¿FLHQF\DWIXOOORDG%&RPEXVWLRQHI¿FLHQF\DWSDUWORDG%+HDWORVVHVWKURXJKWKHFDVLQJPLQPD[%1HWÀXHJDVWHPSHUDWXUHWIWDPD[&)OXHJDVPDVVÀRZUDWHPLQPD[JV$LUH[FHVVȜ%CO2%&2DWRI22PLQPD[SSP0D[LPXPSURGXFWLRQRIFRQGHQVDWHNJK12[FODVV5 5 5
&KLPQH\KHDWORVVHVZLWKEXUQHU21PLQPD[%&KLPQH\KHDWORVVHVZLWKEXUQHU2))%
0D[DYDLODEOHSUHVVXUHDWWKHFKLPQH\EDVHPLQPD[ 3D1RWHV5RRP7HPSHUDWXUH &'DWDREWDLQHGZLWKDSSOLDQFHRSHUDWHGZLWK1DW*DV*2.4.1 - DATA ACCORDING TO ErP DIRECTIVE
Description Symbol Unit OSA S 24 OSA S 28 OSA S 35
1RPLQDO+HDW2XWSXW3QRPLQDOHN:23 27 32
6HDVRQDOVSDFHKHDWLQJHQHUJ\HI¿FLHQF\ڦV% 94 94 94
6HDVRQDOHI¿FLHQF\FODVVLQKHDWLQJPRGHA A A
,QWHJUDWHG:HDWKHUFRPSHQVDWRUDQGURRPVHQVRU&ODVVH9,%4 4 4
6HDVRQDOVSDFHKHDWLQJHQHUJ\HI¿FLHQF\RISDFNDJHڦV3DFNDJLQJ%98 98 98
Seasonal space heating energy
HI¿FLHQF\FODVVRISDFNDJHA+ A+ A+
For CH only and combination boilers: useful heat output
8VHIXO+HDW2XWSXWLQKLJKWHPSHUDWXUHUHJLPH7U&7P&34N:8VHIXOHI¿FLHQF\DWQRPKHDWRXWSXWLQKLJKWHPSHUDWXUHUHJLPH7U&7P&ڦ4%8VHIXOKHDWRXWSXWDWRIQRPKHDWRXWSXWLQORZWHPSHUDWXUHUHJLPH7U&3N:8VHIXOHI¿FLHQF\DWRIQRPKHDWRXWSXWLQORZWHPSHUDWXUHUHJLPH7U&ڦ%5DQJHUDWHGERLOHU<(612YES YES YES
Auxiliary electricity consumption
$WIXOOORDGHOPD[N:$WSDUWORDGHOPLQN:,QVWDQGE\PRGH36%N:Other items
6WDQGE\KHDWORVV3VWEN:(PLVVLRQVRIQLWURJHQR[LGHV12[0JN:K39
For CH & DHW production boilers
'HFODUHGORDGSUR¿OHL XL XL
(QHUJ\HI¿FLHQF\LQ'+:SURGXFWLRQPRGHڦZK% 84 'DLO\HOHFWULFLW\FRQVXPSWLRQ4HOHFN:K'DLO\IXHOFRQVXPSWLRQO4IXHON:K,QVLGHVRXQGSRZHUOHYHO/ZDG%$53 54 54
6HDVRQDOHI¿FLHQF\FODVVin DHW production mode A A A
)RUWKHDGMXVWPHQWGDWD12==/(635(6685(6',$3+5$*06)/2:5$7(6&2168037,216UHIHUWRWKHSDUDJUDSK$'$37$7,217227+(57<3(62)*$6


Technical Features
ENGLISH
)($785(62),17(*5$7('8À\%2;OSA S 24 OSA S 28 OSA S 35
$SSOLDQFHFDWHJRU\,,+3,,+3,,+30LQLPXPKHDWFLUFXLWRXWSXW¨W&OPLQ0LQLPXPKHDWLQJFLUFXLWSUHVVXUHEDU0D[LPXPKHDWLQJFLUFXLWSUHVVXUHEDU3 3 3
3ULPDU\FLUFXLWFRQWHQWO0D[LPXPRSHUDWLQJWHPSHUDWXUHLQKHDW&85 85 85
0LQLPXPRSHUDWLQJWHPSHUDWXUHLQKHDW&([SDQVLRQYHVVHOWRWDOFDSDFLW\O([SDQVLRQYHVVHOSUHORDGEDU0D[LPXPV\VWHPFDSDFLW\PD[WHPSFDOFO0LQLPXPGRPHVWLFKRWZDWHUFLUFXLWÀRZUDWHOPLQ2 2 2
0LQLPXPGRPHVWLFKRWZDWHUFLUFXLWSUHVVXUHEDU0D[LPXPGRPHVWLFKRWZDWHUFLUFXLWSUHVVXUHEDU'RPHVWLFKRWZDWHUVSHFL¿FÀRZUDWH¨W&µµD’’ OPLQ'RPHVWLFKRWZDWHUÀRZUDWHOLPLWHUOPLQ
3URGXFWLRQRI'+:LQFRQWLQXRXVRSHUDWLRQZLWK¨W. OPLQ
3URGXFWLRQRI'+:LQFRQWLQXRXVRSHUDWLRQZLWK¨W. OPLQ
3URGXFWLRQRI'+:LQFRQWLQXRXVRSHUDWLRQZLWK¨W. OPLQ
3URGXFWLRQRI'+:LQFRQWLQXRXVRSHUDWLRQZLWK¨W. OPLQ
3URGXFWLRQRI'+:LQFRQWLQXRXVRSHUDWLRQZLWK¨W. OPLQ9ROWDJH)UHTXHQF\HOHFWULFSRZHUVXSSO\&

)XVHRQWKHSRZHUVXSSO\9+]0D[LPXPDEVRUEHGRXWSXW$)3URWHFWLRQUDWLQJ,3;';';'1HWZHLJKWERLOHUNJ*URVVZHLJKWERLOHUNJ1HWZHLJKWIURQWFDVHVKHOONJ3 3 3
*URVVZHLJKWIURQWFDVHVKHOONJF factor 2 2
R factor
PL[HG
8À\%2;FRQWUROSDQHOWRJKHWHUZLWKroom sensor temperature and outer sensor temperature
SURYLGHGDVVWDQGDUGSHUIRUPVWKHHQYLURQPHQWDOWKHUPRUHJXODWLRQZRUNDVGHVFULEHGLQWKHGRFXPHQW&VHFWLRQClass VI±:HDWKHUFRPSHQVDWRUDQGURRPVHQVRUIRUXVHZLWKPRGXODWLQJKHDWHUV$KHDWHUÀRZWHP-
SHUDWXUHFRQWUROWKDWYDULHVWKHÀRZWHPSHUDWXUHRIZDWHUOHDYLQJWKHKHDWHUGHSHQGDQWXSRQSUHYDLOLQJRXWVLGHWHPSHUDWXUHDQGVHOHFWHGZHDWKHUFRPSHQVDWLRQFXUYH$URRPWHPSHUDWXUHVHQVRUPRQLWRUVURRPWHPSHUDWXUHDQGDGMXVWVWKHFRPSHQVDWLRQFXUYHSDUDOOHOGLVSODFHPHQWWRLPSURYHURRPFRPIRUW&RQWUROLVDFKLHYHGE\PRGXODWLQJWKHRXWSXWRIWKHKHDWHU2.5 - GENERAL FEATURES

3INSTALLATION INSTRUCTIONS
ATTENTION!
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.
This boiler heats water at a temper-
ature lower than the atmospheric
pressure boiling temperature.
%HIRUHFRQQHFWLQJWKHERLOHUKDYHSUR-
IHVVLRQDOO\TXDOL¿HGSHUVRQQHOa)Thoroughly wash all the piping of
the system to remove any residues
or impurities which could jeopard-
ise proper operation of the boiler,
even from a hygienic point of view.
E&KHFNWKDWERLOHULVVHWXSWRRSHU-
DWHZLWKWKHDYDLODEOHW\SHRIIXHO7KLVFDQEHVHHQZULWWHQRQWKHSDFNDJHDQGRQWKHWHFKQLFDOIHDWXUHSODWHF&KHFNWKDWWKHFKLPQH\ÀXHKDVDQDSSURSULDWHGUDXJKWZLWKRXWDQ\ERWWOHQHFNVDQGWKDWQRH[KDXVWVIURPRWKHUDSSOLDQFHVDUHLQVHUWHGXQOHVVWKHÀXHKDVEHHQLPSOHPHQW-
HGWRDFFRPPRGDWHVHYHUDOXWLOLWLHVDFFRUGLQJWRVSHFL¿FVWDQGDUGVDQGUHJXODWLRQVLQIRUFH2QO\DIWHUWKLVFKHFNFDQWKHILWWLQJEHWZHHQWKHERLOHUDQGFKLPQH\ÀXHEHPRXQWHGATTENTION!
If there is dust and/or if there are
aggressive/corrosive vapours
present in the installation room,
the appliance must be protected
suitably and must be able to
operate independently from the air
in the room.
$77(17,212QO\PRXQWWKHDSSOLDQFHRQDFORVHGZDOOPDGHRIQRQÀDPPDEOHPDWHUL-
DOÀDWYHUWLFDOVRWKDWWKHPLQLPXPGLVWDQFHVUHTXLUHGIRULQVWDOODWLRQDQGPDLQWHQDQFHFDQEHREVHUYHG7KHERLOHUPXVWEHFRQQHFWHGWRDFHQ-
WUDOKHDWLQJV\VWHPDQGRUGRPHVWLFKRWZDWHUVXSSO\QHWZRUNFRPSDWLEOHZLWKLWVHI¿FLHQF\DQGRXWSXW3.1 - GENERAL WARNINGS
NOTE!
For more information
See Technical Info
from site indicated at pag. 2
NOTE!
For more information
See Technical Info
from site indicated at pag. 2
3.2 - INSTALLATION STANDARDS
,WPXVWEHLQVWDOOHGE\DSURIHVVLRQDOO\TXDOL¿HGWHFKQLFLDQZKRVKDOOWDNHWKHUHVSRQVLELOLW\RIobserving all local and/or national laws published
LQWKHRI¿FLDOMRXUQDODVZHOODVWKHDSSOLFDEOHtechnical standards.
3.3 - PREVENTIVE VERIFICATION
AND VERIFICATION AND AD-
JUSTMENT OPERATIONS
NOTE!
For further details relating to the
standards, rules and regulations
for safe installation of the thermal
unit, refer to the section "Technical
Information" on the boiler page of
the www.unicalag.it website


ENGLISH
Installation Instructions
%2,/(5OSA S 3'HSWKL
:LGWKH +HLJKWPPPPPPSHELL
OSA S 3'HSWKL
:LGWKH +HLJKWPPPPPP23

7KHOSA ERLOHULVVXSSOLHGFRPSOHWHO\DVVHPEOHGLQDVWXUG\FDUGERDUGER[$IWHUKDYLQJUHPRYHGWKHDSSOLDQFHIURPWKHSDFNDJLQJPDNHVXUHWKDWWKHVXSSO\LVFRPSOHWHDQGXQGDPDJHG7KHSDFNDJLQJHOHPHQWVFDUGERDUGER[VWUDSVSODVWLFEDJVHWFmust be
NHSWRXWRIWKHUHDFKRIFKLOGUHQDVthey are potential sources of dangerUnical AG S.p.A. ZLOOQRWEHKHOGOLDEOH$VZHOODVWKHDSSOLDQFHWKHSDFNDJLQJFRQWDLQV$'2&80(17$7,21(19(/23(8VHURSHUDWLQJLQVWUXFWLRQVERRNOHW,QVWUXFWLRQERRNOHWIRUWKHLQVWDOOHUDQGPDLQWHQDQFHHQJLQHHU:DUUDQW\6SDUHSDUWVIRUP&HUWL¿FDWHRIFRQIRUPLW\*DVFRQYHUVLRQODEHO%&RQQHFWLRQSUHGLVSRVLWLRQSDSHUWHPSODWH'&KLPQH\VSDFHU(%UDFNHWIRU¿[LQJ)8À\%2;*2XWHUVHQVRU5HPRWHWHPSHUDWXUHVHQVRU3.4 - PACKAGING IRUGDPDJHWRSHUVRQVDQLPDOVRUREMHFWVGXHWRIDLOXUHWRFRPSO\ZLWKWKHLQVWUXFWLRQDERYH


OSA S 24 - OSA S 28 - OSA S 35
:KHQFKRRVLQJWKHSODFHRIWKHLQVWDOODWLRQRIWKHDSSOLDQFHIROORZWKHVDIHW\LQVWUXFWLRQVEHORZ3ODFHWKHDSSOLDQFHLQURRPVSURWHFWHGIURPIURVW$YRLGLQVWDOODWLRQLQURRPVZLWKDFRUURVLYHRUYHU\GXVW\DWPRVSKHUH7KHDSSOLDQFHPXVWRQO\EHLQVWDOOHGRQDYHUWLFDODQGVROLGZDOOZKLFKFDQVXSSRUWLWVZHLJKW7KHZDOOPXVWQRWEHPDGHRIÀDPPDEOHPDWHULDO6LQFHWKHWHPSHUDWXUHRIWKHZDOORQZKLFKWKHERLO-
HULVLQVWDOOHGDQGWKHWHPSHUDWXUHRIWKHFRD[LDOH[KDXVWSLSHGRQRWH[FHHGLQQRUPDORSHUDWLQJFRQGLWLRQVDURRPWHPSHUDWXUHEH\RQG.LWLVQRWQHFHVVDU\WRREVHUYHWKHPLQLPXPGLVWDQFHVIURPÀDPPDEOHZDOOV)RUERLOHUVZLWKGRXEOHLQWDNHDQGH[KDXVWSLSHVLQWKHHYHQWRIFURVVLQJÀDPPDEOHZDOOVLQVHUWLQVXOD-
WLRQEHWZHHQWKHZDOODQGWKHÀXHJDVH[KDXVWSLSH3.5 - POSITIONING THE BOILER
Clearance


ENGLISH
Installation Instructions
3.6 - FLUE GAS EXHAUST PIPE CONNECTION FOR BOILERS WITH FORCED DRAUGHT
7RFRQQHFWWKHÀXHJDVH[KDXVWSLSHORFDODQGQD-
WLRQDOVWDQGDUGVPXVWEHREVHUYHGIn the event the boiler is replaced, ALWAYS re- SODFHWKHÀXHJDVSLSHDVZHOO7KHERLOHULVW\SHDSSURYHGIRUWKHH[KDXVWFRQ¿JX-
UDWLRQVOLVWHGEHORZC13x C13
6ORSHWRZDUGVLQOHW 727$//(1*7+/$LQWDNH/([KDXVW&2$;,$/'28%/()520>P@72>P@)520>P@72>P@1 5,5 1 + 1 40
(20A+20S)
&2$;,$/'28%/()520>P@72>P@)520>P@72>P@1 8 1 + 1 20
(10A+10S)
'LVWDQFHEHWZHHQDLULQOHWSLSHDQGÀXHJDVH[KDXVWSLSHPLQPPPD[HorizontalH[KDXVWDQGLQWDNHWHUPLQDOVGLUHFWHGRXWVLGHYLDFRD[LDORUGRXEOHSLSHVC33x C33
727$//(1*7+/$LQWDNH/([KDXVW&2$;,$/'28%/()520>P@72>P@)520>P@72>P@1 7 0,5 + 0,5 40
(20A+20S)
&2$;,$/'28%/()520>P@72>P@)520>P@72>P@1 9 1 + 1 20
(10A+10S)
erticalH[KDXVWDQGLQWDNHWHUPLQDOVGLUHFWHGRXW-
VLGHYLDFRD[LDORUGRXEOHSLSHVC53x C53
C53 NOT ALLOWED C53
727$//(1*7+/$LQWDNH/([KDXVW'28%/('28%/()520>P@72>P@)520>P@72$>P@1 + 1 40
(max 30 S) 1 + 1 20
(max 15 S)
6HSDUDWHFRPEXVWLRQDLULQWDNHDQGFRPEXVWLRQSURGXFWVHYDFXDWLRQSLSHV7KHVHSLSHVFDQGLVFKDUJHLQWRDUHDVZLWKGLIIHUHQWSUHVVXUHC43x C43
&ROOHFWLYHFKLPQH\ÀXHV\VWHPFRQVLVWLQJRIWZRSLSHVRQHIRUFRPEXVWLRQDLULQWDNHDQGWKHRWKHURQHIRUFRPEXVWLRQSURGXFWVHYDFXDWLRQFRD[LDORUGRXEOH

B23P 727$//(1*7+/6'28%/()520>P@72>P@1 30
&RQQHFWLRQWRDFRPEXVWLRQSURGXFWVHYDFXDWLRQSLSHRXWVLGHWKHURRPWKHFRPEXVWLRQDLULVWDN-
HQGLUHFWO\IURPWKHURRPZKHUHWKHDSSOLDQFHLVLQVWDOOHGATTENTION:
)RUWKHW\SHRIFRQQHFWLRQB23PWKHURRPIROORZVWKHVDPHLQVWDOODWLRQUXOHVIRUERLOHUVZLWKQDWXUDOGUDXJKWPlease note:
These values relate to exhausts/
made by means of rigid pipes and
smooth original UNICAL.
CAUTION
LTWRWDOOHQJWKLVDUHIHUHQFHYDOXHIRUWKHGLPHQVLRQLQJRIWKHGXFWVRIA
LQWDNHDQGS([KDXVW6XEWUDFWLQJWKHYDOXHVRILTUHSRUWHGDWYDOXHVRIEHQGVWHUPLQDOVH[WHQVLRQV\RXJHWWKHYDOXHif > 0 = OK 3266,%/(FRQ¿JXUDWLRQif < 0 = NO:521*FRQ¿JXUDWLRQ9DOXHVLQWKHMT018 DYDLODEOHRQWKHZHEVLWHC83x C83
&RQQHFWLRQWRDWHUPLQDOIRUFRPEXVWLRQDLULQWDNHDQGÀXHJDVH[KDXVWYLDDVLQJOHRUFROOHFWLYHFKLPQH\C93x C93
$LUÀXHJDVWKURXJKFRQFHQWULFSLSHVLQWKHERLOHUURRPDQGVLQJOHSLSHVLQWKHFKLPQH\FRPEXVWLRQDLUZLWKFRXQWHUORZLQWKHFKLPQH\C63x C63
%RLOHULQWHQGHGIRUFRQQHFWLRQWRDFRPEXVWLRQDLULQWDNHDQGFRPEXVWLRQSURGXFWVHYDFXDWLRQV\VWHPDSSURYHGDQGVROGVHSDUDWHO\ATTENTION:
7KHÀXHPXVWFRPSO\ZLWKVWDQGDUGVin force.
NOTE!
For more information
See Technical Info
from site indicated at pag. 2