Biasi RIVA COMPACT HE M96.24SM/C User manual

Wall hung,fanflue,roomsealed,highefficiencygasboiler
Usermanualand
Installationinstructions
RIVACOMPACTHE
Models
M96.24SM/C
M96.28SM/C
M96.28SR/C
ThisproducthasanenergyratingBonascaleofAtoG
Formoreinformationsee www.boilers.org.uk
Thisisacertificationmark

Congratulationsonyourchoice.
RIVACOMPACTHEarecondensinghighefficiencysealedchamberfanfluegasboilers.
Theyarefullyelectronicallycontrolledandhave electronicignition.
Thematerialstheyaremadeofandthecontrolsystemstheyare equippedwithgiveyousafety,
ahighlevelofcomfortandenergysavingstoallowyoutoget thegreatestbenefitoutof
independentheating.
RIVACOMPACTHEallowahigherefficiencybyreducingthefluegastemperaturesuchthat
thewatervapourformed duringthecombustioniscondensedout.
Thisallowsagainofusefulheat thatotherwisewould belost.
Rememberthat...
nThemanual
--- mustbereadthoroughly,sothatyouwill
beabletousetheboilerinasafeandsen-
sibleway;
--- mustbecarefullykept.Itmaybenecess-
aryfor referenceinthefuture.
nFirstlightingupmustbecarriedoutby
competentandresponsible engineer.
nThemanufacturer
--- disclaimall liabilityforanytranslationsof
thepresentmanualfromwhichincorrectin-
terpretationmayoccur
--- cannotbeheldresponsiblefornon---ob-
servanceofinstructionscontainedinthis
manualorfortheconsequencesofanypro-
cedurenotspecificallydescribed.
Usingtheboiler...
nBeforelightingtheboileryouaread-
visedtohaveaprofessionallyqualified per-
soncheckthat theinstallationofthegas
supply
--- isgas---tight;
--- isofthecorrectgaugefortheflowtothe
boiler;
--- isfittedwithall thesafetyandcontrolde-
vicesrequired bythecurrentRegulations.
nEnsurethat
--- theinstallerhasconnectedthepressure
reliefvalveoutlet toadrainpipe.Themanu-
facturersarenotresponsiblefordamage
caused byopeningofthepressurerelief
valveandconsequentescapeofwater,ifnot
connectedcorrectlytothedrain.
--- theinstallerhasconnectedtheconden-
sateoutlet toasuitabledrainpipe.
nOndetectingthesmell ofgas
--- don’toperateanyelectricalswitches,the
telephoneoranydevicethatmayproduce
sparks;
--- openthewindowsand doorsatonceto
createadraughtofairwhichwill purgethe
area;
--- shutoff thegascocks;
--- get theassistanceofaqualified person.
nDonot touchtheappliancewithpartsof
thebodythatarewetordampand/orbare
feet.
nDonotblockormodifythecondensate
outletand pipework
nIncaseofstructuralworkormainten-
ancenearthe exhaustductand/orfume ex-
haustdevicesortheirattachments,turnoff
theappliance.Oncompletionofthework,
haveaprofessionallyqualified personcheck
theirefficiency.
nRepairs(underguarantee)mustbecar-
riedoutonlybyanapprovedengineer,using
genuinespareparts.Thusdonomorethan
switchingoff theboileryourself(see thein-
structions).
nYourboilerallowsheatingupofwaterto
atemperatureless thanboilingpoint;
--- mustbeconnectedtoacentralheating
systemand/orahotwatersupplysystem,
compatiblewithitsperformanceandoutput;

--- canbeusedonlyforthosepurposesfor
whichithasbeenspeciallydesigned;
--- mustnotbetouched bychildrenorby
thoseunfamiliarwithitsoperation;
--- mustnotbe exposedtoweathercondi-
tions.
nDuringtheoperationitisquitenormal
that theboilerproducesawhiteplumeof
condensationvapourfromtheflueterminal.
Thisisduetothehighefficiencyoftheap-
plianceandmaybeparticularlyevidentwith
lowoutdoortemperatures.
Safehandlingof
substances
Biasiproductsaremanufacturedinaccordance
withISO9000 and donot,andwill not,containany
hazardousmaterialsorsubstances suchasas-
bestos,mercuryorC.F.C.’s.
Theappliancepackagingdoesnotcontainany
substances,whichmaybeconsideredahazardto
health.
Combustionchamberpanels
Material:mineralfibers
Known hazards--- Somepeoplecansuffer red-
deninganditchingoftheskin.Fibre entryintothe
eyewill causeforeignbodyirritation,whichcan
causesevereirritationtopeoplewearingcontact
lenses.Irritationtorespiratorytract.
Precautions--- Dustgoggleswill protecteyes.
Peoplewithahistoryofskincomplaintsmaybe
particularlysusceptibletoirritation.Highdustle-
velsareonlylikelytoarisefollowingharshab-
rasion.Ingeneral,normalhandlingandusewill
notpresenthighrisk,followgoodhygieneprac-
tices,wash handsbefore,touchingeyes,consum-
ingfood,drinkingorusingthetoilet.
Firstaid--- Medicalattentionmustbesoughtfol-
lowingeyecontactorprolongedreddeningofthe
skin.
Thermostat/Temperaturegauge
Description--- Sealed phialandcapillarycontain-
ingliquid.
Known hazards--- irritatingtoskin,eyesand
throat.Vapourisharmful.Inflammable--- donot
extinguishwithwater.
Precautions--- Donotincinerate.Avoidcontact
withbroken/leakingphials.Donotpurposely
puncture.
Firstaidmedicalattentionmustbesoughtfollow-
ingeyes/skincontact,washwithcleanwater.
AppliancecategoryII2H3+GasG20 20 mbar,G30 29 mbar,G31 37 mbar
Countryofdestination:UnitedKingdom
ThisapplianceconformswiththeEECdirective90/396 and,consequently,ithastheright tomakeuse
ofthebrandname
Moreover,theapplianceconformswiththeEECdirective87/308 relativetothepreventionandelimina-
tionofradiodisturbances.
Theapplianceisbuilt tocomplywiththeregulation nowinforceregarding gasappliance’s safetyand
theEuropeanregulation nowinforcerelativetosafetyofhouseholdandsimilarelectricalappliances.
Themanufacturer,inthecontinuouspocess toimprovehisproducts,reservestheright tomodifythe
dataexpressedinthepresentdocumentationatanytimeandwithoutpriornotice.
Thepresentdocumentationisaninformativesupportanditcannotbeconsideredasacontract to-
wardsthird parties.

Boilerinstallationandcommissioningtips
nTheinstallationmustbecarriedoutby
aqualified personwhowill beresponsiblefor
observingthecurrentRegulations.
Installingtheboiler...
nDonotforget toremovethetransitcaps
and plugsfromtheboilerconnectionsthese
arefittedtoeveryboiler.
nKeeptheboilerclearofdustduringin-
stallationandinparticulardonotallowany
dustordebristoenterthetopoftheboiler
wheretheflueconnectionismade.Itisrec-
ommendedthatyouputadustsheetoverthe
topoftheboileruntilyouarereadytomake
theflueconnection.
nBecause everyboilerisfiredandtested
liveat thefactory,asmall amountofwater re-
mainswithintheboiler.Itispossibleforthis
watertoinitiallycausethepumptoseize.Itis
thereforerecommendedthat thepumprotor
bemanuallyturnedtofree itsrotationbefore
turningtheboileron.
nRemembertoreleasetheautoairpurge
beforefillingtheboiler.See theinstructionsto
identifythelocationofthisdevice.
nDonotremovethecapofthepressure
testpointsoftheairswitch(topleftsideofthe
boiler).
nYouarestronglyadvisedtoflushout the
systembothcoldandhotinordertoremove
systemandinstallationdebris.
nItisalsosensibletoinitiallyfireandcom-
missiontheboilerbeforeconnectinganyex-
ternalcontrols suchasaroomthermostat.By
thismethodifyou haveasubsequentprob-
lemfollowingtheadditionofanexternalcon-
trolyoucaneliminatetheboilerfromyour
faultanalysis.
nDonotforget torangeratetheboilerto
suit thesystemrequirements.Thispro-
cedureiscoveredinthecommissioningsec-
tionoftheinstallationmanual.
nIftheboilerisfittedwithadigitalpro-
grammer,whensettingthetimesforauto-
maticoperation,rememberthatforevery
“ON”timetheremustbean“OFF”timetofol-
lowandthatoneveryoccasionyouentera
timeyoumustalsoindicatewhichdaysthat
youwant theboilertofollowthetimedset-
tings.
nSomeproductsincorporateananticycl-
ingtimedelay.Itisnormalwhenfirstswitch-
ingtheboileronfortheboilerto operateon
heatingforafewsecondsthenswitchoff.
After3---4minuteshaselapsedtheboilerwill
thenreigniteandoperateperfectlynormally.
Theignitiondelaycycledoesnotprevent
normaloperationoftheboilertoprovide
d.h.w.
nIfyouareinanydoubtsastotheinstalla-
tionoroperationoftheboilerpleasereadthe
instructionmanualsthoroughlyandthenif
necessarycontactBiasiUKforadviceand
assistance.
Pleaserememberthatifyouareinanydoubtabout theinstallationofthisproductyoucancontactour
TechnicalHelplineontel.01902 304400

TABLEOFCONTENTS
1
1Appliancedescription2..........
1.1Overview2......................
1.2Controlpanel2..................
1.3Isolationvalves2.................
1.4Technicaldata2.................
1.5Operationlights3................
2Instructionsforuse4............
2.1Warnings4......................
2.2Refillingprocedure4..............
2.3Ignition5........................
2.4C.h.circuit temperature5..........
2.5D.h.w.temperature(combi)6......
2.6Extinguishing6..................
2.7Builtintimeswitch7..............
3Usefuladvice10.................
3.1Centralheating10.................
3.2Frostprotection10................
3.3Periodicmaintenance10...........
3.4Externalcleaning10...............
3.5Operationalfaults10...............
4Technicalinformation12..........
4.1Overview12......................
4.2Maindiagram(combi)13...........
4.3Maindiagram(c.h.only)14.........
4.4Hydraulicspecifications15.........
4.5Expansionvessel15...............
4.6TechnicaldataM96.24SM/... 16......
4.7Technicaldata
M96.28SM/... M96.28SR/... 18.......
5Generalrequirements20..........
5.1Related documents20.............
5.2Locationofappliance20...........
5.3Fluesystem20....................
5.4Gas supply21....................
5.5Airsupply21.....................
5.6Ventilation21.....................
5.7Condensatedrain21..............
5.8Watercirculation(c.h.)21...........
5.9Domesticwater22.................
5.10 Watertreatment22................
5.11 Electricalsupply23................
6Installation24....................
6.1Warnings24......................
6.2Precautionsforinstallation24.......
6.3Installingthebracket24............
6.4Overall dimensions25.............
6.5Joints25.........................
6.6Mountingtheboiler25.............
6.7Fittingthefluesystem26...........
6.8Choiceof flue26..................
6.9Electricalconnections27...........
6.10 Externalfrostprotection29.........
6.11 ConnectingaM96.28SR/...
systemboilertoacylinder29.......
7Commissioning31...............
7.1Electricalinstallation31............
7.2Gas supplyinstallation31..........
7.3Fillingthed.h.w.system31.........
7.4Initialfillingofthesystem31........
7.5Condensatepipeandtraps32......
7.6Lightingtheboiler32..............
7.7Checkingthegaspressure
at theburner32...................
7.8Adjustingtheburnerignition33.....
7.9Adjustmentofusefulc.h.output34. .
7.10 Checkingtheignitiondevice35.....
7.11 Checkingthefluesystem35........
7.12 Checkingthecondensatedrainpipe35
7.13 Instructingtheuser35.............
8Gasconversion36...............
8.1Warnings36......................
8.2Procedures36....................
9Maintenance37..................
9.1Warnings37......................
9.2Dismantlingthe externalpanels37...
9.3Emptyingthed.h.w.system(combi)37
9.4Emptyingthec.h.system37........
9.5Combustionanalysischeck38......
9.6Cleaningtheprimaryheatexchanger38
9.7Checkingthepressurisation
inthe expansionvessel38..........
9.8Cleaningtheburner38.............
9.9Checkingtheflue38...............
9.10 Drainpipeinspection38............
9.11 Visualinspectionofappliance38. . . .
9.12 Gaspressuresandsoundness 38...
Abbreviationsusedinthemanual
C.h.=Centralheating
D.h.w.=Domestichotwater
D.c.w.=Domestic coldwater
USE
INSTALLATIONMAINTENANCE

1APPLIANCEDESCRIPTION
2
1.1Overview
2
1
3
Fig.1.1
1Casefrontpanel
2Controlpanel
3Controlpanelcover
1.2Controlpanel
4C.h.circuit temperatureand pressuregauge
5Timeswitch(c.h.control)*
6Lock---outsignal lamp
7Lockoutresetbutton
8Functionselectorandc.h.temp.controlknob
9D.h.w.temperaturecontrolknob*
10 Applianceoperationlights
1.3Isolationvalves
14
12
16
13
15
11
Fig.1.2(bottomviewoftheboiler)
11 Condensatedrainpipe
12 C.h.returnvalve
13 D.c.w.inletvalve*
14 Gasinletvalve
15 D.h.w.outletpipe*
16 C.h.flowvalve
1.4Technicaldata
Fordetailedtechnicaldatasee section4.6or4.7
ofthismanual.
89 7 6 4510
M96.24SM/...
M96.28SM/...
M96.28SR/...
Fig.1.3
*
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M
9
6
.
2
8
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USE

Appliancedescription
3
1.5Operationlights
Three lights(10 inFig.1.3)givedetailedindication
regardingtheoperationoftheboiler.
Thefollowingtablegivestherelationship between
eachofthepossiblelightcombinationsandtheir
meaning.
Ashortpulse every4
seconds:
stand---bycondition
Functionselectorin
position.
Anti---freezesystemactive
1second pulse every2
seconds:normally
operatingboiler.Function
selectorinor
position
C.h.operation
D.h.w.operation*
Frostprotectoperation
D.h.w.operation
Excessivetemperatureon
primarycircuit*
Faultyc.h.temperature
probeNTC
Faultyd.h.wtemperature
probeNTC*
Faultyprimarycircuit
(nowaterorabsenceof
flow)
Lackofburnerignition(no
ignitionsignalfromthefull
seqenceignitiondevice)
Ignitiongaspressure
adjustment
Minimumgaspressure
adjustment
L
a
m
p
O
F
F
L
a
m
p
O
N
F
l
a
s
h
i
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g
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a
m
p
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a
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e
o
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s
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e
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withanotherlamp.
F
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a
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h
i
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g
l
a
m
p
,
a
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r
n
a
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lamp.
*
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2
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USE

2INSTRUCTIONSFORUSE
4
2.1Warnings
BiasiUKLtdsupport theBenchmarkinitiat-
ive.Withintheinformationpack,youwill
findaBenchmarkLogBook.Itisveryim-
portant that thisiscompletedcorrectlyby
theinstallerand/orthecommissioningen-
gineerat thetimeofinstallation,commis-
sioningandhandovertotheuser.
All CORGIRegisteredInstallerscarrya
CORGI IDcard,andhavearegistration
number.Bothshouldberecordedinyour
BenchmarkLogBook.Youcancheckyour
installerisregisteredbycallingCORGIdi-
recton01256 372300.
Inordertoguarantee safetyandcorrectoper-
ation,itisessentialthatall thetestsarecarried
outbyacompetentandresponsibleservice
engineerbeforelightinguptheboiler.
Thetestsaredescribedintheinstallationin-
structionsinsection7commissioning.
Ensurethat thec.h.circuitisregularlyfilledwith
water(eveniftheboilerisonlyusedford.h.w.
supply)checkingthat thepressureindicated
onthetemperatureand pressuregauge4is
notlowerthanthatshowninFig.2.2.
Ifthepressurereadingonthepressuregauge
isbelowthatshowninFig.2.2,thenthesystem
will requiretoppingup.Afillingloopisnormally
provided bytheinstallerforthispurpose.
Ifyouareinanydoubtregardingthispro-
cedureyouareadvisedtocontactyourIn-
stalleroranApprovedEngineer.
Thisapplianceisprovidedwithabuiltinanti---
freezesystemthatoperatestheboilerwhenthe
temperatureisbelow4°C
Therefore,whentheboilerisnotlitorusedin
coldweather,withconsequentriskof freezing
donotswitchoff theboilerat thefusedspur
isolationswitchorclosethegasinletcock.
Whenyoudonotexpect tousetheboilerfora
longperiodandtheboilerisnot tobeusedfor
frostprotectionthenfollowtheinstructions
giveninsection2.6onpage6.
2.2Refillingprocedure
1Isolatetheboilerfromthe electricalsupplyat
thefusedspur.Reconnect thefillingloopas
demonstratedinFig.2.1.
Temporary
connection
Controlvalve
Controlvalve
Doublecheckvalve
Supplypipe
(coldwaterinlet)
C.h.returnpipe
Fig.2.1
2Openthevalvesofthefillingloopandwatch
thegaugeuntilitreachesnormalfillingpres-
sureas showninFig.2.2.
4
Normalfilling
pressure
Fig.2.2
3Closethevalvesandremovethefillingloop.
Ifyouexperienceanydifficultywiththeoper-
ationoftheboiler,switchoff theboilerimmedi-
atelyat thefusedspurisolationswitchand
contactyourInstalleroranapprovedService
Engineer
Airintroducedintotheboilerduringthisfillingpro-
cess will vent throughtheautomaticairpurger
fittedtotheboiler.Youmayalsofinditnecessary
toventairfromyour radiatorcircuitusingyour
radiatorkey,howeverbeawarethatexcessive
ventingwill causethepressureinthesystemto
drop.
Alwaysensurethat thepressuregaugeis setat the
required pressure.
USE

Instructionsforuse
5
2.3Ignition
1Checkthat thevalveslocatedinthelowerpart
oftheboilerareopen(Fig.2.3).
Openposition
Fig.2.3
2Turnonthe electricitysupplytotheboiler,
switchingonthefusedspurisolationswitch.
Theapplianceoperationlight10 (Fig.2.4)will
flashevery4seconds(stand---bycondition).
3Iftheboileristobeusedforc.h.and d.h.wposi-
tionthefunctionselector8asinFig.2.4
(combi)orinFig.2.5(c.h.only).
Theapplianceoperationlight10 will flash
every2seconds(operatingboiler).
810
Fig.2.4
810
Fig.2.5
4Ifd.h.w.supplyonlyisrequired(combi),posi-
tionthefunctionselector8asinFig.2.6.
Theapplianceoperationlight10 will flash
every2seconds(operatingboiler).
810
Fig.2.6
2.4C.h.circuit temperature
Theoutput temperatureofc.h.waterisadjustable
fromaminimumofabout38°Ctoamaximumof
about85°C(Fig.2.7),byturningthefunctionse-
lector(8).
Adjustmentofc.h.outputontheboilerisauto-
matic.Thegreatestoutputpre---setinthefactory
can,however,bereducedinlevelaccordingto
actualsystemrequirements;thisdoesnotaffect
themaximumoutputind.h.w.operation.
Suchadjustmentsmustbecarriedoutbyaquali-
fied person;thereforeweadviseyoutocontact
yourinstallerorServiceAgent.
Adjustmentoftheboilertemperaturealtersthe
gasflowat theburneraccordingtothethermalde-
mandinthesystem.Soitisusualtosee theburner
litat theminimumlevelformoreorless long
periods.
Minimum
Maximum
Fig.2.7
USE

Instructionsforuse
6
Adjustment
Inordertoachieveoptimalsettingsforeconomy
andcomfort,werecommendadjustingtheoper-
atingtemperatureofthec.h.wateraccordingto
theoutsidetemperature,positioningtheknobas
follows:
Lowerthan
--- 5°C
From5to15 °C
Between
---5and+5°C
Fig.2.8
Yourqualifiedinstallerwill beabletorecommend
themostsuitableadjustmentforyoursystem.
Thetemperatureand pressuregauge(4,Fig.1.3
onpage2)will allowyoutocheckthat theset tem-
peratureisobtained.
2.5D.h.w.temperature(combi)
Thetemperatureofthed.h.w.leavingtheboiler
canbevariedfromaminimumofabout35°Ctoa
maximumofabout55°C(Fig.2.9),byturningthe
temperaturecontrolknob9.
9
Minimum
Maximum
Fig.2.9
Adjustmentofthed.h.w.temperatureiscomplete-
lyseparatefromthatofthec.h.circuit.
Theadjustmentsystemintegratedwithinthe
boilerautomaticallycontrolstheflowofgastothe
burnerinordertokeepthetemperatureofd.h.w.
deliveredconstant,betweenthelimitsofmaxi-
mumandminimumoutput.
Wherethedemandisatalowlevelorwiththetem-
peratureset totheminimum,itisnormaltosee a
cycleoflightingandextinguishingoftheburner
whenrunning.
Adjustment
Itisadvisabletoadjust thed.h.w.temperatureto
alevelcommensuratewiththedemand,minimis-
ingtheneedtomixwithcoldwater.Inthisway,the
automatic controlfacilitieswill befullyexploited.
Moreover,wheretheamountoflimescalepresent
inthewatermaybeparticularlygreat,notexceed-
ingthepositioninFig.2.10 ofthed.h.w.tempera-
turecontrolknob9correspondingtoabout50°C
(Fig.2.10),minimisesannoyingincidencesof
scaledepositsandclogging.
9
Fig.2.10
Inthesecases,however,itisadvisabletoinstall a
small watertreatmentdeviceorsoftener.With
suchadeviceyoushouldavoid periodicdescal-
ing.
Consequently,thed.h.w.heatexchangerwill keep
itsperformanceconsistentforalongerperiodof
timewithresulting gas savings.
Ifthedemandford.h.w.is sogreatastoprevent
reachingahighenoughtemperature,havetheap-
propriateoutputlimitingvalveinstalled by yourin-
stalleroranAuthorisedServiceEngineer.
2.6Extinguishing
Toturntheboileroff set thefunctionselector8to
thepositionshowninFig.2.11 (combi)or
Fig.2.12 (c.h.only).
USE

Instructionsforuse
7
Theapplianceoperationlight10 will flashevery4
seconds.
810
Fig.2.11
810
Fig.2.12
Whenyoudonotexpect tousetheboilerforalong
period:
1Switchoff the electricitysupplytotheboiler,by
meansofthefusedspurisolationswitch;
2Shutoff thegas supplycock14 andthevalves
forthewatercircuitsfittedundertheboiler
(Fig.2.13).
3Emptythewatercircuits,ifnecessary,as
shownintheinstallationinstructionsinthesec-
tionmaintenance.
Closed position
14
Fig.2.13
2.7Builtintimeswitch(combi)
Thecombiboilersare equippedwithabuiltinelec-
tronictimeswitch(5,Fig.1.3onpage2)which
controlsthec.h.operation.
H
A
BCDEF
G
Fig.2.14
Displayandcontrolpanel
AModeselectorswitch
BResetbutton
CEnterbutton
DIncrease“+”settingbutton
EDecrease“---”settingbutton
FOn--- off button
GTimedisplay
HON--- OFF display
Settingthecurrent time
Note:withanewunitorwhentheresetbuttonB
hasbeenpressedandtheselectorswitchAisto
theposition,thetimedisplayGisflashing.
Set themodeselectorswitchAtotheposition
and press thebuttonsDorEuntilthecurrent time
appearsinthedisplayG.
TheclockstartsbymovingtheswitchAtothe
AUTOposition.
SettingexampleshowninFig.2.15:
Current time16.30.
USE

Instructionsforuse
8
A
Fig.2.15
Settingtheswitchingtime
20 memorylocationsareavailable,corresponding
to10 on---off sequences.
Set themodeselectorswitchAtotheC1position.
Thesymbols showninFig.2.16 appearsinthe
display.
A
Fig.2.16
Press thebuttonsDorEtoset thedesiredON
time.
Press the“enter”buttonCtoconfirmthesetting
andtocontinueprogrammingtheOFF time.
Set theOFF timeasexplainedabovefortheON
settingandconfirmbypressingthe“enter”button
C.Proceedinthesamewayforothersettings.
SettingexampleshowninFig.2.17:
A--- ONtime7.45.
B--- OFF time10.30.
AB
Fig.2.17
Activatingthetimedsettings
Set themodeselectorswitchAtotheAUTOposi-
tionshowninFig.2.18.
Thecurrent timeappearsinthedisplay.TheON---
OFF displayHindicatesthecurrentstateofoper-
ation(accordingtothesettings).
A
Fig.2.18
Note:whenthemodeselectorswitchAisinthe
AUTOpositionandtheboileris switchedoff at the
fusedspurisolationswitch,thedisplayHindicates
onlytheOFF state.Theotherindicationsare
blanked.
Readingthetimedsettings
Set themodeselectorswitchAtotheC1position.
Thesymbols showninFig.2.16 appearsinthe
display.
Press the“enter”buttonC.Eachtimethebutton
ispressedthedisplayshowsthedetailsofthenext
setting.
Changingordeletingthetimedsettings
Set themodeselectorswitchAtotheC1position.
Thesymbols showninFig.2.16 appearsinthe
display.
Press the“enter”buttonCuntilthedisplayshows
thesettingtobemodifiedordeleted.
Thetimesettingcanbemodifiednowbypressing
buttonDorEandtheoperationcanbeswitched
onoroff bypressingthebuttonF.
Todeleteatimesetpress thebuttonDorEuntilthe
symbols showninFig.2.16 appearsinthetime
displayG.
Thenewsettingsarememorized bymovingthe
switchAtoadifferentposition.
Manualoperation
Theoperationofthetimeswitchcanbeforcedon
oroff constantlyorforatimed period.
Toforceconstantlyonoroff thetimeroperation
set themodeselectorswitchAtotheTIMERposi-
tion.Thesymbols showninFig.2.19 appearson
thedisplay.
USE

Instructionsforuse
9
Fig.2.19
Theoperationcanbeswitched permanentlyonor
off bypressingthebuttonFandleavingtheswitch
AintheTIMERposition.
Toforceatimed delayonoroff operation,set the
modeselectorswitchAintheTIMERposition.
Set thetimedelaybypressingthebuttonDorE
andtheoperationcanbeforcedonoroff bypres-
singthebuttonF.
Thetimedelaycanbesetwithinthefollowing
ranges:
1to23 hourswithstepsof1hour
1to27 dayswithstepsof1day
Thetimedelaysettingisactivated bymovingthe
switchAtotheAUTOposition.
TheON--- OFF displayHflashesindicatingthat the
currentstateofoperation hasbeenforced.
Todeletethetimed delaysetting,set themodese-
lectorswitchAintheTIMERposition,press the
buttonDorEuntilthesymbols showninFig.2.19
appearsinthedisplayandthenset themodese-
lectorswitchAtotheAUTOposition
SettingexampleshowninFig.2.20:
forcedONstatefor4hours.
Fig.2.20
Resetting
Tocompletelyreset thetimer,press theresetbut-
tonwithapointedobject(pencil).
CAUTION:pushingtheresetbuttonwill complete-
lyerasethesettingsaswell asall thedata,includ-
ingthecurrent time.
USE

3USEFULADVICE
10
3.1Centralheating
For reasonablyeconomicalserviceinstall aroom
thermostat.
Nevershutoff theradiatorintheareawherethe
roomthermostatisinstalled.
Ifaradiator(oraconvector)doesnotheatup,
checkthatnoairispresentinitandthatitsvalve
isopen.
Iftheambient temperatureistoo high,donotalter
theradiatorvalves.Reducethecentralheating
temperatureinstead bymeansoftheroomther-
mostatandthefunctionselector(8inFig.3.1).
8
Fig.3.1
3.2Frostprotection
Thisapplianceisprovidedwithabuiltinanti---
freezesystemthatoperatestheboilerwhenthe
temperatureisbelow4°C
Therefore,whentheboilerisnotlitandusedin
coldweather,withconsequentriskof freezingdo
notswitchoff theboilerat thefusedspurisola-
tionswitchorclosethegasinletcock.
3.3Periodicmaintenance
Forefficientandcontinuousoperationofthe
boiler,itisadvisabletoarrangemaintenanceand
cleaningbyanAuthorisedServiceCentreEn-
gineer,atleastonceayear.
Duringtheservice,themostimportantcompo-
nentsoftheboilerwill beinspectedandcleaned.
This servicecanbepartofamaintenancecon-
tract.
Inparticular,youareadvisedtohavethefollowing
checkscarriedout:
--- primaryheatexchanger;
--- domestichotwaterheatexchanger;
--- burner;
--- exhaustfumeductandflue;
--- pressurisationofthe expansiontank;
--- fillingupofthecentralheatingcircuit;
--- bleedingofairfromthecentralheatingsystem;
--- generalcheckoftheappliance’soperation.
3.4Externalcleaning
Beforecarryingoutanycleaning,disconnect the
appliancefromthe electricalmains,usingthe
fusedspurisolationswitchfittedadjacent tothe
appliance.
Tocleanthe externalpanels,useaclothsoakedin
soapywater.Donotusesolvents,abrasivepowd-
ersorsponges.
Donotcarryoutcleaningoftheapplianceand/or
itspartswithreadilyflammablesubstances(for
examplepetrol,alcohols,naphtha,etc.).
3.5Operationalfaults
Ifthelock---outsignal lampcomeson
thisindicatesthat thesafetylock---out6(Fig.3.2)
has stoppedtheboiler
Tore---start theboiler,itisnecessarytopress the
boiler resetbutton7(Fig.3.2).
7
6
Fig.3.2
Forthefirstlightingupandfollowingmaintenance
proceduresforthegas supply,itmaybenecess-
arytorepeat theresettingoperationseveraltimes
soastoremovetheairpresentinthepipework.
Safetylock--- outmayoccourevenincaseofan
blockageofthecondensatedrainage(e.g.
plugged drainpipe).
Itisadvisabletocheckthecondensatedrainage
pipeandtrapsforcleaness.
Incaseofpersistentlock---outcall acompetent
andresponsibleservice engineer.
Ifnoisesduetoairbubblesareheard during
operation...
youshouldcheckthat thepressureonthetem-
peratureand pressuregauge(Fig.2.2onpage4)
isnotbelowthecorrectsetting.
Ifrequired,topupthesystemcorrectly,asde-
scribedinthesection2.2ofthismanual.
Bleedanyairpresentintheradiators,ifnecessary.
USE

Usefuladvice
11
Ifthepressureonthetemperatureandpres-
suregauge(4onpage2)hasgonedown...
itisnecessarytotopuptheappliancewithwater
again,soastoraisethepressuretoanadequate
levelasdescribedinthesection2.2ofthismanual.
Iftoppingupwithwaterhastobedoneveryfre-
quently,havethesystemcheckedforleaks.
Ifwatercomesoutofthepressurereliefvalve
Checkonthetemperatureand pressuregauge(4
onpage2)that thepressureinthecentralheating
circuitisnotcloseto3bars.Inthiscase,tempera-
tureriseinthecircuitcancausethepressurerelief
valveto open.
Sothat thisdoesnothappenandtodecreasethe
pressuretoanormalvalue,itisadvisabletovent
someofthewaterintheappliancethroughthe
bleedvalvespresentintheradiators.
Ifintime,areductionindomestichotwater
supplyisobserved...
Thelikelycausesmaybeimpuritiescaughtinthe
domestichotwaterflowswitchfilterorlimescale
depositedinthedomestichotwaterheatex-
changer.Itisadvisabletohavetheappliance
cleanedoutbyanAuthorisedServiceCentreEn-
gineer.
Ifwatershouldoccasionallyleakfromthe
boiler...
shutoff thevalvespositionedundertheboiler
(Fig.2.13 onpage7)andcall anAuthorisedSer-
viceCentreEngineer.
Iftheleftapplianceoperationlight10 (Fig.3.3)
flashesveryquicklytheboilerisdetectinga
fault.
10
Fig.3.3
Inthiscaseorincaseofproblemsotherthan
thosementionedhere,switchoff theboiler,as
describedinsection2.6onpage6andcall a
competentandresponsibleservice engineer.
USE

4TECHNICALINFORMATION
12
4.1Overview
18
31
30
28
29
24
27
19
36
26
25
32
20
23
35
33
2122
17
34 37
Fig.4.1
11 Condensatedrainpipe
12 C.h.returnvalve
13 Domestic coldwaterinletvalve
14 Gasinletvalve
15 D.h.w.outletpipe
16 C.h.flowvalve
17 Condensatetrap
18 Maincircuitdrainvalve
19 Automaticairpurgervalve
20 Pump
21 Pumpventplug
22 Modulationgasvalve
23 D.h.w.temperatureprobeNTC
24 Primarycircuitflowswitch
25 C.h.temperatureprobeNTC
26 Three--- waydivertervalve
27 Flame--- detectingelectrode
28 Ignitionelectrodes
29 Burner
30 Combustionchamber
31 Primaryheatexchanger
32 Fan
33 Airswitchpressuretestpoints
34 Fluethermostat
35 Airpressureswitch
36 Condensingheatexchanger
37 Safetythermostat
38 D.h.w.flowswitch
39 C.h.pressurereliefvalve
40 Modulationoperator
41 Gasvalveoutletpressuretestpoint
42 Gasvalveinletpressuretestpoint
43 D.h.w.heatexchanger
44 C.h.expansiontank
45 By--- pass valve
46 Venturidevice
47 Domesticwatercircuitfilter
48 D.h.w.flowlimiter
49 Flueoutletpipe
50 Airintakepipe
INSTALLATION

Technicalinformation
13
4.2Maindiagram(combi)
46 35
50
49
24
31
28
41
20
39
38
22
42
19
26
43
45
47
12 131614
44
32
27
25
23
15
40
37
29
18
48
36
17
11
34
Fig.4.2
INSTALLATION

Technicalinformation
14
4.3Maindiagram(c.h.only)
46 35
50
49
24
31
28
41
20
39
22
42
19
45
12 1614
44
32
27
25
40
37
29
18
36
17
11
34
Fig.4.3
INSTALLATION

Technicalinformation
15
4.4Hydraulicspecifications
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0 200 400 600 800 1000 1200 1400
0
10
20
30
40
kPabar
l/h
60
50
Fig.4.4
ThehydraulicspecificationsinFig.4.4represent
thepressure(availableheadforthecentralheat-
ingsystem)asafunctionoftheflowrate.
Theloadloss duetotheboilerhasalreadybeen
subtracted.
Outputwiththermostatcocks shutoff
Theboilerisfittedwithanautomaticby---pass
valve(45 onpage12),whichprotectstheprimary
heatexchanger.
Incaseofexcessivereductionortotalblockageof
watercirculationinthecentralheatingsystem
owingtoclosureofthethermostaticvalvesorsys-
temcomponentcocks,theby---pass valve ensur-
esaminimumflowofwaterthroughtheprimary
heatexchanger.
4.5Expansionvessel
Note:thisboilerisdesignedforoperationonly
inasealedcentralheatingsystem
Theheightdifferencebetweenthepressurerelief
valveandthehighestpointinthesystem maybe
7matmost.
Forgreaterdifferences,increasethepre--- load
pressureinthe expansionvessel(44 onpage12)
andthesystem,whencold,by0.1barforeach
additional1m.
Capacityl6,0
Pre---load pressurekPa
bar
100
1,0
Maximumvolumeofwater
inthesystem*
l132
Tab.4.1
*Whereconditionsare:
--- Averagemaximumtemperatureofthesystem
is80°C
--- Initialtemperaturewhenfillingupthesystemis
10°C
Forsystemswithvolumesgreaterthan132 l,an
additionalexpansionvesselmustbeprovided.
INSTALLATION

Technicalinformation
16
4.6Technicaldata
mod.M96.24SM/...
Heatinput(A)
NominalkW
BTU/h
25,0
85 295
MinimumkW
BTU/h
11,0
37 530
UsefuloutputG20
MaximumkW
BTU/h
24,6
83 973
MinimumkW
BTU/h
10,2
34 936
MaximumcondensingkW
BTU/h
26,6
90 754
MinimumcondensingkW
BTU/h
11,1
37 871
UsefuloutputG30 G31
MaximumkW
BTU/h
23,7
80 894
MinimumkW
BTU/h
10,2
34 936
MaximumcondensingkW
BTU/h
26,6
90 754
MinimumcondensingkW
BTU/h
10,8
36 997
Centralheating
Maximumflowtemp.°C85
Minimumflowtemp.°C38
Minimumreturntemp.°C30
MaximumpressurekPa
bar
300
3
MinimumpressurekPa
bar
30
0,3
Availablehead
(in1000 l/h)
kPa
bar
25
0,25
Seasonalefficiency
G20 (B)band
%
B
87,7
Seasonalefficiency
G30 G31 (B)band
%
B
86,9
Domestichotwater
Maximumtemperature°C55
Minimumtemperature°C35
MaximumpressurekPa
bar
1 000
10
MinimumpressurekPa
bar
30
0,3
Flowrate
minimuml/min2,5
30°rise(C)l/min12,1
35°rise(C)l/min10,1
40°rise(C)l/min8,7
Gas supplypressures
GasNatural
G20
Butane
G30
Propane
G31
Norm.Pa
mbar
2 000
20
2 900
29
3 700
37
MaxPa
mbar
2 500
25
3 500
35
4 500
45
Min.Pa
mbar
1 700
17
2 000
20
2 500
25
1mbarapproximatelyequals10 mm H2O
(A)referredtothenetcalorificvalueat15 °Cand1013,25 mbar
G20 =34,02 MJ/m3,G30 =45,6MJ/kg,G31 =46,4MJ/kg
(B)ThevalueisusedintheUKGovernment’sStandardAssessmentProcedure(SAP)forenergyrating
ofdwellings.Thetestdatafromwhichithasbeencalculatedhavebeencertified byanotified body.
(C)Values subject totolerance
INSTALLATION