Unical FIREX 2S User manual

Brand: Unical

Model: FIREX 2S

Type: User manual

Unical FIREX 2S is a device designed for hot air circulation heating systems. It features multiple operation modes, including wood combustion, automatic fuel switching, and backup boiler operation. The control panel allows for precise temperature adjustment and monitoring. The device is equipped with safety features such as an overtemperature alarm and a reset key. It also supports summer mode for domestic hot water production without heating.

FIREX 2S

OPERATING INSTRUCTIONS FOR THE USER

1 - SYMBOLS USED IN THE MANUAL

Pay special attention when reading this manual to the parts marked by the symbols:

NOTE!

Suggestions for the user

ATTENTION!

Possible hazardous situation

for the product and the environment

DANGER!

Serious danger for

personal safety and life

2 - APPROPRIATE USE OF APPLIANCE

The FIREX appliance has been constructed 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 intended to operate in hot air circulation heating systems. Any other use must be consid-

ered improper.

UNICAL shall not be held liable for any damage resulting from improper use; in this case the user is fully

responsible for the risk.

Use according to the intended purposes also includes careful compliance with the instructions in this manual.

3 - WATER TREATMENT

• Thehardnessofthefeedwaterconditionsthefrequencyatwhichthedomestichotwaterproducermustbecleaned.

• Ifthewaterhasahardnessgreaterthan15°f,werecommendusingwatersofteners,chosenaccordingtothe

characteristicsofthewater.

• WerecommendcheckingandcleaninganyinstalledD.H.W.exchangerattheendoftherstyearofuseandevery

twoyearsthereafter;onthisoccasion,alsocheckthestateofwearoftheanode.

TABLE OF CONTENTS

1 Symbolsusedinthemanual...................................................................................................................................................... 2

2 Appropriateuseofappliance...................................................................................................................................................... 2

3 Watertreatment......................................................................................................................................................................... 2

4 Informationprovidedtotheuserbyinstaller/maintenancetechnician........................................................................................ 3

5 Safetywarnings.......................................................................................................................................................................... 3

6 Operatinginstructions................................................................................................................................................................ 4

6.1 Panelboard......................................................................................................................................................................... 4

6.2 Checksbeforecommissioning............................................................................................................................................. 6

6.3 Thewood........................................................................................................................................................................... 10

6.4 Woodhumidity................................................................................................................................................................... 10

6.5 Dimensions........................................................................................................................................................................ 10

6.6 Start-up.............................................................................................................................................................................. 10

6.7 Combustionairadjustment................................................................................................................................................ 11

6.8 Checkstobecarriedoutaftercommissioning................................................................................................................... 12

6.9 Generalwarnings.............................................................................................................................................................. 13

6.10Summermode................................................................................................................................................................. 13

6.11Maintenance.................................................................................................................................................................... 14

6.12Troubleshooting............................................................................................................................................................... 15

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,highlightingtheirindispen-

sablenatureandstrict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.

• Rememberthatthesystemmustreceiveregularmaintenanceatleastonceayearandacombustionanalysis

mustbeperformedinthetimetableforeseenbystandardsinforce.

• 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manual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.

4 - INFORMATION PROVIDED TO THE USER

BY THE INSTALLATION/MAINTENANCE TECHNICIAN

5 - SAFETY WARNINGS

ATTENTION!

The appliance must be installed, adjusted and maintained by professionally qualiﬁed personnel, in compli-

ance with standards and provisions in force. Incorrect installation 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 qualiﬁed personnel, authorised by Unical. We recommend stip-

ulating a maintenance contract.

Insufﬁcient or irregular maintenance can jeopardise the operating safety of the appliance and cause damage

to persons, animals and objects for which the manufacturer cannot be held responsible.

Modifying parts connected to appliance

Donotmodifythefollowingparts:

- theboiler

- thegas,air,waterandelectricitylines

- theuegaspipe,safetyvalveandheatingwaterdrainpipe

- theconstructionpartswhichaffecttheoperatingsafetyoftheappliance.

Smell of gas

Shouldasmellofgasbeperceived,followthesesafetyguidelines:

- donotturnelectricswitchesonoroff

- donotsmoke

- donotusethetelephone

- closethegasshut-off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 ﬂammable substances

Donotuseorstoreexplosiveoreasilyammablematerials(e.g.petrol,paints,paper)intheroomwheretheap-

plianceisinstalled.

6 - OPERATING INSTRUCTIONS

6.1 - CONTROL PANEL

Functionsofswitches:

 Luminousmainswitch(green)

 fanstartkey

 controlunitRESETkey

 summer/winterkey

 safetythermostat resetkey (locatedontheleft

side)

 boilerfunctionsadjustmentMENUkey

 functionsvalueincreasekey

 functionsvaluedecreasekey

 keytochangeprioritydomestichotwater/heating

 boiler maximum temperature sound alarm

 acknowledge

Functionsofindicatorlights:

 solarpanelpumpstartindicatorlight



 loadpumpstartindicatorlight

 storagetank

 heatingpumpstartindicatorlight

 freeindicatorlight

 fanstartindicatorlight

 auxiliaryboilerstartindicatorlight

 oil/gas

FUNCTIONS OF CONTROL SWITCHES /

CONTROL KEYS:

Pressingtheswitch

powersthepanelandalltheoper-

ationsconnectedtoit.

Byholdingkey

forfewsecondsitispossibletoselectthe

followingoperationoptions:

-WOOD COMB

-AUTO COMB

-BURN COMB

- - - - -Stand-by(alloff)

WOOD COMB

Inthismodethewoodboilerisinoperation.

Whenboileroperationstops,theback-upboilerisNOTactivated.

AUTO COMB

InthismodethewoodboilerisinoperationandthewordsLeg

Autoashonthedisplay;theboilerisworkingonwood.

Whenloadingiscompleted,intheeventofdemand,theback-up

boilerisautomaticallyactivated.

BRUC COMB

Inthismodetheback-upboilerisinoperation.

After selecting the LEGN COMB or AUTO COMB mode,by

pressing

 forone second the fan is powered.This will

remainactiveaslongasthereiswoodintheboilerwoodcom-

partment.Thiscycleistimed;thereforewhenactivatedwiththis

key,theboardcontrolstheboiler'sabilitytoproduceheat;when

itrunsout,theboilerreturnstothestandbystatusafterapreset

timeduringwhichnomoreheatisavailable.Theloadendstatus

isbroughtaboutbytheuegastemperature

The

 key changes the SUMMER /WINTER setting;in

SUMMERmodetheheatingsystempumpisdisabled.

Thekey

changestheprioritybetweendomestichotwater

andheating.

Thiskeyisactiveifthereisastoragetankwithacoil.Itstops

heatinginfavourofDHWproductionandviceversa.

Thestoragetankwaterproductioncycleorstoragetankload-

ingwillautomaticallyactivatewhenthestoragetankminimum

temperatureisreachedanditwillde-activatewhenthestorage

tankhasreachedthedesiredtemperature.

Whenroomheating is managedbythe chronothermostat (or

room thermostat) control, with closed contact and sufcient

boilertemperature,theboardactivatestheheatingsystempump.

Thearrangementwillbeviewedonthedisplayaccordingtothe

followingphases:

- “DHW”setting,theboilerautomaticallyactivatesdomestic

hotwaterpriority when the storagetank hasreached the

minimumtemperature.

- “OFF”settingwhentheboilerhasrequestedneitherDHW

orheating.

- “CH”setting when the boiler has been requested heating

through the chronothermostat (or room thermostat) input

contact.

- “MAINT”whenaDHWorheatingrequestisactivated,and

parameter“P0”ismet.

Thekey

silencesthesoundalarmincaseofovertemper-

aturealarm.

Incaseofanalarm,allthepumpsconguredaccordingtothe

programmedoperatingmodeareactivatedtodisperseexcess

heat(ANTI-INERTIAFUNCTION)andthefanstops.

Thesoundalarmistriggeredautomaticallyshouldtheboiler's

owtemperatureexceedthe“P2”value.Atthesametime,the

STORAGETANKPUMPfunctionLEDandtheSYSTEMPUMP

functionLEDonthedisplayswitchon.

The keyisusedtoresetthe“self-diagnostics”con-

troller.

Thisoperationdoesnotaffectthesetparameters,which

arenotmodied.

IMPORTANT!

Before powering the panel board, ensure the

main switch is on O and that the safety thermo-

stat is “reset".

Starting up the boiler

Thisswitchconnectsanddisconnectspowertotheboiler.

- Withtheswitchat0 ,theboilerisnotpoweredelectri-

cally(greenindicatorlightoff).

- Withtheswitchat

,theboilerispoweredelectrically

(greenindicatorlighton)andissetupforoperation.

 The recirculation pump works.

The detected boiler ﬂow, return and ﬂue gas tempera-

tures will be shown on the ﬁrst screen of the display.

Flue gas extraction start up

Whenthepanelisturnedonbymeansoftheswitch 

thefanwillbeautomaticallypowered.

Whentheindicatorlight

isblue,itmeansthatapos-

sibleauxiliaryboilercanbepoweredbymeansofoutput

11-12ofterminalJ1ontheboard.

When the indicator light

 is red, it means that the

wood-redboilerfanisrunning.

Tointerruptthecombustionstageandstopthefan,press

key

foronesecond;

Door opening micro-switch operation check

Tocheckcorrectwiringandoperationofthedooropen-

ingmicro-switch,opentheupperwoodloadingdoor;the

controllerwillstartemittingshortBEEPSatshortintervals

andthelowerrowofthedisplaywillreadBOILERDOOR

OPEN.

Justclosethewoodloadingdoortosilencethealarm.

Summer / Winter mode selection

TheSummer/Winterfunctioncanbeselectedwithkey

andthelowerrowofthedisplaywillreadalternatively

SUMMERWATERWOODCOMB.orWINTHEAT.WOOD

COMB.ifthereisdemandfordomestichotwaterorifthe

roomthermostatisrequesting.

Programming procedure

(only qualied personnel)

To enter parameter programming,hold the key 

pressedforabout8secondsuntiltherstmodiablepa-

rameter(parametro 0)appearsonthedisplaywiththe

defaultvalue.

Nowpressthekey

andthegurewillstartashing.

Changethegurewiththekeys

and .

Press

toconrmthegure.

Pressthekey

for8secondstoexitthemenu.

Fortherangeofvaluesthatcanbesetaccordingtothe

systeminstalled,seechapter4oftheInstallationinstruc-

tionbooklet(Parameterslist/Settablevalues)page23.

Bypressingthekeys

and ,thenextparameters

can be viewedin sequence. Set the desired valuesby

actingasexplainedpreviouslyand,whenprogramming

iscompleted,conrmalltheselectionsbyholdingthekey

pressedfor8seconds.

Thiswilltransferallthechangestothenon-volatilemem-

oryofthecontrolboard.

Resetting the safety thermostat

The safety thermostat is triggered when the boiler

temperature exceeds 100°C and blocks the fan. The

pumps enabled according to the type of diagrams will

continue working.

IMPORTANT: The reset control of the FIREX boiler

safety thermostat is located on the left of the panel

board.

The thermostat resets operation of the wood-ﬁred

boiler.

To access it when the boiler blocks, unscrew the plas-

tic cap with a screwdriver; after resetting the boiler,

put the plastic cap back on.

Thesafetythermostatcanbetriggeredwhentheboiler

overheats.Thiscanbesolvedrstofallbyloweringthe

operatingtemperatureoftheboiler(seenextpoint).

IftheroomthermostatisnotrequestingthewordsWINT

OFFWOODCOMB.aredisplayed,orifthereisnodemand

forDHWthewordsSUMMEROFFWOODCOMB.

InSummermode,theheatingsystempumpisdisabled.

Heating system temperature

adjustment

Itispossibletocontrol the temperature of theFIREX

boilersystemwaterbychangingPARAMETER 0

TheP0parameteristheonlyparametertheuserisable

tomodify;theremainingparametersmayexclusivelybe

changedbyanAfterSaleServiceCentre.

Temperatureis adjusted between a minimum of 70°C

and a maximum of 85°C.

Seepreviouspoint"Programming procedure".

Lighting the boiler

The top door is open to load wood and the

fan runs at full speed.

Light the wood as described in Chap. 6.3.

With lower boiler door closed, upper door open and op-

erating fan after lighting the wood, the upper door closes

and fan is switched o.

To activate the actual combustion cycle just press the

on/o key for one second: The fan starts and goes

to nominal speed set in parameter P13.

The board displays the message “Wood comb”. The boil-

er on or o status is brought about by the ue gas temper-

ature reached in a certain period of time.

When the on/o key is pressed a timer is activated, the

time of which is set in parameter P11. During this time the

ue gas temperature must reach the value set in parame-

ter P14 (minimum ue gas temperature for boiler ignition

detection), upon reaching it the boiler continues operating

regularly.

If however, when the set time has elapsed the ue gas

temperature has not reached the value set in P14, the

boiler fan switches o and the combustion cycle stops.

This may depend on the amount of fuel loaded or adjust-

ment of primary and secondary boiler air. Always check

the ame is present during the ignition phase through the

ame sight glass located in the lower door of the boiler.

Pump operation is connected to the boiler water temper-

ature and does not follow the ue gas temperature gure,

therefore the case may occur where the boiler is in stand-

by and the pumps are operating.

Heating system pressure

For systems with open expansionvessel,

pressuredoesnotneedtoberestoredas

itisdoneautomaticallybythelevelswitch

placedinsidethevessel.

Ifthesafetydeviceoftheboilertripsrepeatedly,donottry

torestoreoperationoftheboileronyourown,butcontact

anAfterSaleServiceCentre.

When the water temperature in the boiler goes below the

gure set in parameter P1 the pumps stop.

6.2 - CHECKS BEFORE COMMISSIONING

Beforecommissioningtheappliance,thefollowingshould

bechecked:

- Makesurethattheshut-offvalvesformaintenanceon

theowandreturnpipesofthesystemareopen.

- Checktheconnectionofthesafetyvalvestothesewer

system.

 Makesurethe boileris poweredelectrically;themain

switchonthepanelboardmustbeonwhenplacedat.

- Checkthewaterpressureontheboilerpressuregauge

(see"heatingsystempressure");forbestoperation,the

pressureshouldbebetween1and1.2bar(withpump

stopped).

- Makesurethatthefanalwaysrunsatmaximumspeed

whentheloadingdooropens.

- Checkproperoperationoftheby-passwhenthedooris

opened,properoperationandsealwith“doorclosed”.

 Openingthe loadingdoor causesthe fanto startup

automatically.Inthiswaytheuegasaccumulatedin

thewoodstorageisextractedandconveyeddirectlyto

thechimney.

 Thebypass,in conclusion,allowstheuegastobe

dischargedto thechimneywithout escapinginto the

roomwhenloadingthewoodorduringlighting.

Complete decommissioning

When the system is put completely out of service, hot

waterproductionisfullydeactivated.

Intheeventofputtingcompletelyoutofservice,disconnect

powertotheboilerbyopeningthecontactonthetwo-pole

switchupstreamoftheboilerandickingthemainswitch

onthepanelboardto0 :theindicatorlightwillswitchoff.

Closethecoldwaterandgasshut-offtap(ifback-upboiler

withgas-fuelledburnerispresent).

ATTENTION!

Theheatingsystemcanbeeffectivelyprotectedagainst

icebyusingspecicantifreezeproductssuitableformul-

ti-metalplants.

Do not use car engine antifreeze prod-

ucts as they could damage the water

gaskets.

6.3 - FIREWOOD

Woodisformedmainlybycelluloseandlignite.

It also contains other substances, such as

resin(r-pine),tannin(oak-chestnut)and,

obviously,alargequantityofwater.

Good quality woods are oak, ash, beech,

mapleandfruittrees,exceptcherry;medium

qualitywoodis:chestnutandbirch;sufcient

quality wood: lime tree, poplar and willow.

Resinoustreesare,normally,second-ratequalityfuels.

Wood is therefore an extremely heterogeneous fuel,

due to differentessences (beech, oak, fruit, resinous),

different moisture content, and due to different shapes

anddimensions.

Boiler operation will inevitably be effectedbyall these

factors. Especially by the log dimensions, the moisture

contentandthewaywoodisloadedintheboiler.

6.4 - WOOD MOISTURE

The caloric value of the different types of

wooddependsontheirmoisturecontent,as

illustratedinthetable.Boileroutputandauton-

omywilldiminishasthemoistureincreases.

Thetableprovidesthepowerreductionfactor

basedonthemoistureofthewoodbeingused.

TheheatoutputoftheFIREXboileriscalcu-

latedforwoodwitha15%moisturecontent.

Asanexample,woodwhichhasbeendried

for 2 years in a sheltered area has a 25%

moisturecontent.

Example:

moistureofthewoodbeingused=25%

output=nominaloutputx0.86

6.5 - FIREWOOD DIMENSIONS

The dimensions, together with the moisture

content, contribute to determine the boiler’s

output.Smallpieces(withalength,however,

conforming to indications indicated hereby)

aremoreeasilyammableandthereforehave

the tendency to increase the boiler’s output

andthereforetoreduceitsautonomy.Moreo-

ver,theyfallwithgreaterfacility,inthelower

chamber,reducingtheriskoftheformationof

“bridges”.Theso-called“bridge”isanempty

spaceintherewoodstoragecompartment,whereun-

burntwoodlogsremain.Inthiscasethebedofembersis

notfedwithcontinuityandtherefractoryburner’sslotis

uncovered.Intheseconditions,preferentialairductsare

createdwithaverysmallameduetoanexcessofair.

TheFIREXboilermustbefedwithnaturalwoodlogsof

thelengthsetoutinparagraph6.6.Thelogsectionmust

normallyberound(Øapproximately10cm).

6.6 - START-UP

Ensurethechecksreferredtoinpoint6.2

havebeenperformed.

Closethebottomdoorandpowerthecontrol

board(fortheoperationmode,seepoint6.1).

Openthetoploadingdoorandplacesome

dry wood kindling crosswise on the main

stone,abovethecentralslot.

Usehighlyammablematerialonthewood,avoidinglarge

andsquarelogs.

Lightthewoodusingthinsheetsofpaper(newspaperor

thelike).

Therstignitionofthenewboilercouldbedifcultdueto

moistrefractorycementcasting.

Accordingly,weadvisefullyopeningtheprimaryairand

loweringthesecondaryair.

Closetheupperdoorandwaitafewminutesforthere

tostartandproducesomeembers(about5minutes).

Afterafewminutes,iflookingthroughtheamesightglass

ofthelowerdooryouseethatameinversionisbeginning,

addotherlargerlogs.

Closethetopdoor.

Presskey

for1second,andthecombustionphase

willstart.

Correctionfactorsforwoodmoisture

%OF

HUMIDITY

CALORIFIC

VALUE

kWh/kg

CORRECTION

FACTOR

4.50

4.18

3.87

0.93

0.86

CALORIFIC

VALUE

MJ/kg

16.20

15.05

13.93

Thewoodmusthavethefollowinglength:

a)50cm(+1cm,-4cm)

 formodelFIREX34

b)50cm(+1cm,-4cm)

 formodelsFIREX45

c) 70cm(+1cm,-4cm)

 formodelFIREX55

tagliare

6.7 - COMBUSTION AIR

MODULATION

PRIMARY AND SECONDARY AIR ADJUSTMENT

TheFIREXboilerisequippedwithacombustionairintake

fan,acombustionairadjustmentunit(pos.1)andprimary

air(pos.P)andsecondaryairregulators(pos.S).

When commissioning the boiler, the primary and sec-

ondaryairneedtobeadjustedbearinginmindthatthe

primaryairdeterminestheboilerheatoutputandtherefore

theamountofwoodthatisburned,andthesecondaryair

completescombustion.

Thefollowingaretheoptimaladjustmentsofprimaryand

secondaryairusinggoodqualitywood(beech)withlow

moisturecontent(15%).

These measurements must always be strictly com-

plied with.

Asevenwoodfeedingisessentialforgoodcombustion,

itisnecessarytoensurethelengthofthewoodlogsfed,

their shape and the manner of loading do not prevent

regularfeedingofthefuel.

Thewoodlogsmustbeplacedlengthwiseandhorizontally.

Nologshouldbetiltedorplacedsideways.

Onceyouhavecheckedameinversion,itispossibleto

proceedwithfurtherloading(bearinmindthattheprimary

andsecondaryairadjustmentindicationsinthetableare

approximate).

FURTHER LOADING

Beforeloadingwoodonceagain,consumetheprevious

oneasmuchaspossible.

Youcanaddmorewoodwhenthebedofembersinthe

rewoodcompartmentisabout5cmdeep.

Opentheloadingdoorandtheinternalanti-smokedoor

slowly.

Itisnecessarytousewoodlogswiththelengthstatedin

thepreviousparagraph.

Placethenewwoodlogsasdescribedabove.

USEFUL TIPS AND WHAT TO AVOID

- Logswhicharetoolongdonotfalldownproperlyand

cancause"bridges".

- Logswhicharetooshortcauseirregularairducts,with

consequentreductioninoutputandefciency.

- If the quality of the wood causes "bridges", it could

becomenecessarytoloadlogscutinhalfsothatthe

totallength“L”isasindicatedinthepreviousparagraph.

 Toavoidtheformationof"bridges",itisunadvisableto

placelogsagainstthesidewallsofthewoodstorage

compartment.

- Alwaysopentheupperdoorslowly,inordertoavoid

blowbacksandsmokeformation.

During normal operation, it is strictly

forbidden to open the lower door.

primary air secondary air

pos. pos.

FIREX 34 3÷4 ~1

FIREX 45 4÷5 1÷2

FIREX 55 3÷4 1÷2

Forproperairadjustmentbasedonthetypeofwoodused

anditsactualmoisturelevel,itisnecessarytoobservethe

amethroughtheamesightglassplacedonthelower

door.Theameshouldllabouttwo-thirdsofthelower

combustionchamberandgentlylap the bottomcradle,

withoutdraggingtoomuchashandwithoutnoise.

Theamemusthaveanorange-pink-whitecolour,itmust

nottootransparentandthecentreshouldtendtowards

blue.

cut

To bring the ﬂame to optimum conditionsyoushould

thenadjust the primary air by turning the knob (pos.

P).Dothesamefor the secondary air (pos. S).

Exampleno.1

Thick damp wood that is difﬁcult to burn

S-Veryclosed(trytoobtainthemaximumdimensionof

theame,butnotreddishincolour).

P-Reasonablyopeninordertoobtainsufcientgasi-

cation.

Exampleno.2

Very ﬂammable wood logs

S-Completelyopen.

P-Slightlyclosedinordertokeepgasicationlow,but

sufcientlyopentoevacuatetheashthatmightclosethe

combustionhead.

GENERAL ADVICE

- Betterperformancewillbeachievedaftertwoorthree

daysofrunning.Infacttherefractorymaterialmustbe

redandthetarmustencrusttheupperwallsofthe

woodstoragecompartment.

- Theameshouldhaveagoodsizeandfairlyllthe

combustionchamber.

- Theameshouldnotbetoored(lackofsecondaryair

S).

- Theameshouldnotbetooblue(excessofsecondary

airS).

- Theameshouldnotbetoonoisy(excessofprimary

airP).

- Theameshouldnotbetoosmall(lackofprimaryair

P).

- Iftheashesdonotgodownwell(increaseprimaryair

P).

- Iftoomanyashesfall(decreaseprimaryairP).

- Ifthechimneyissmoking(opensecondaryairSallthe

way).

- Ifsmokecontinuestoescape(opensecondaryairSto

amaximum,chokingprimaryairPpartiallyaswell).

6.8 - CHECKS TO BE CARRIED OUT AFTER

COMMISSIONING

CHECKING SEALS

During the initial start-up,checkthe tightness of the

smokecircuitandconnectiontothechimney.Ifthereis

any noticeablesmoke leakage, alert the installer and/

orourAfter-SalesService.Ifthereisanynoticeableair

suctionthrough thedoorseals,tightenthe handlewith

greaterforce.

MakesuretheworkingthermostatTe(32)isingoodrun-

ningorderatfullpoweruntilitstopsthefan.

Checkforleaksfromplumbingconnections.

1 Air adjustment unit

S Secondary air adjustment screw

P Primary air adjustment screw

AIR ADJUSTMENT FAULTS

1)Iftheprimaryairisexcessive,alotofashandsmall

piecesofcoalwillfall.Theameistoofast,dry,hasacold

colourandisnoisy.

The boiler is consuming a lot of wood and the door’s

insulationiswhite.

2)Iftheprimaryairisinsufcient,theamewillbeslow,

hesitant, affected byair currents and by the chimney

draught,verysmall,incapableoftouchingthelowercradle,

withlowashproductionandthedoor’srefractoryinsulation

willbedarkcoloured.

3)Ifthesecondaryairisexcessive.theamewillbesmall,

ofabluishcolourandverytransparent.

4)Ifthesecondaryairisinsufcienttheamewillbebig,

itwilltouchthelowercradle,itwillcompletelyllthecom-

bustionchamberand,aboveall,itwillbeofaredcolour

andnotatalltransparent.

Afterthe initialstart,with theboiler off,openthelower

doorandinspecttheinternalwallsandinsulationofthe

door:theyshouldbeofalightcolour,indicativeofproper

airadjustment.

Otherwise,ifthewallsareblackened,itmeansthesec-

ondaryairisnotadjustedproperly(par.6.7).

6.9 - WARNINGS

HOW TO AVOID CORROSION IN THE

WOOD STORAGE COMPARTMENT

Theuseofwoodwithahighmoisturecontent(higherthan

about25%)and/orloadsnotproportionedtothesystem’s

heatrequest(long OFF periodswiththe wood storage

full)cancauseconsiderablecondensateformationinthe

storagecompartment’sinternalwall.

Checkthesteelwallsoftheupperwoodstorageoncea

week.

Theymustbecoveredbyaslightlayerofdrytar,opaque

coloured,withbubblestendingtobreakandfalloff.On

theotherhand,ifthetarlooksglossy,runnyandliquid

appearsifremovedwithapoker:accordingly,woodthat

islessdampmustbeusedand/ortheamountofloaded

woodmustbereduced.

If,despitethesemeasures,thetardoesnotdry,itisob-

ligatorytoreporttheanomalytotheAfter-SalesService.

Thecondensateinsidetherewoodstoragecompartment

causesthesteelsheetstocorrode.

Corrosionisnotcoveredbythewarranty,asitiscaused

byimproperuseoftheboiler(wetwood,excessiveload-

ing,etc.).

CORROSION OF THE FLUE CIRCUIT

Fluegasisrichinwatervapour,duetocombustionand

theuseofwoodwhichretainswater.

Iftheuegascomesintocontactwithrelativelycoldsur-

faces(havingminimumtemperaturebelow60-70°C),

thewatervapourcondensatesand,combiningwithother

combustionproducts,leadstocorrosionofthemetalparts.

Checkdailywhethertherearesignsofuegasconden-

sation(blackliquidontheoorandbehindtheboiler).In

this case wood with a lowermoisture content must be

used;checkrecirculationpumpoperationandtheuegas

temperatureatpartialload,andincreasetheoperating

temperature. In order to control the room temperature,

it is thereforenecessary to install a mixing valve. The

corrosion caused by the ﬂue gas condensation is not

covered by the warranty, as it is caused by the wood’s

moisture content and the way the boiler is used.

WARNINGS DURING USE

Every time the air is adjusted, wait 5-10 minutes before

proceeding with the next adjustment.Whenyouhave

establishedthebestairadjustment,attheendoftheday

checkthesurfacesofthecombustionchamberandthe

doorinsulation,whichshouldbewhite.

Theremustbeonlyafewunburntembersintheashde-

positedinthecradle.Ifthereistoomuchprimaryair,there

willbeembersandsmallpiecesofcoalintheashes,the

amewillbequick,dry,acoolercolourandwillbenoisier,

excessivelypowerful(chap.6.7).

If the primary air is insufcient, the ame will be slow,

small, it will not caress the lower cradle,dragging few

ashesandtheheatoutputwillbeinsufcient.

Iftheameisdarkorange,thesecondaryairisinsufcient

andthesurfacesofthecombustionchamberwillnotbe

white;ifitissmallandblue,thereistoomuchsecondary

air.

Alwaysopentheloadingdoorandtheinternalanti-smoke

doorslowly.

Ifdespitethiswarningthereareblowbacks,youmustuse

largelogswhichareabitmoister,makesuretheboileris

notstoppedfortoolong(reduceprimaryair-par.6.7)and

checkwhetheranybrokengratesorforeignobjects(nails,

metalpieces)haveobstructedtherefractoryburnerhole.

6.10 - SUMMER MODE

Theuseoftheboilerinsummeronlyfortheproduction

ofdomestichotwaterisnotadvisable,unlesstheboiler

isrunstrictlyfollowingtheserules:

1)Useverydrywood.

2)Loadasmallamountofwoodintheboiler1or3times

adayasneeded.

Important.

Itisverywrongtoloadtheboilercompletely,providingit

withlongself-sufciency(forexample24hours).Thisway

theboiler(withthefanstopped)wouldproducemuchacid

condensationcorrodingthewoodstoragecompartment.

6.11 - MAINTENANCE

Danger!

Before performing any maintenance,

make sure the boiler and its components

have cooled down.

Warnings

Neverdrainwaterfromthesystem,evenpartially,unless

absolutelynecessary.

Periodicallycheckthe properoperationandintegrityof

theuegasexhaustpipeand/ordevice.

Donotcleantheboilerand/oritspartswitheasilyam-

mablesubstances(e.g.petrol,alcohol,etc.).

Donotleaveammablesubstancesintheroomwhere

theboilerisinstalled.

Donotcleantheboilerroomwhiletheboilerisrunning.

IMPORTANT

Cleanwithbrushesandavacuumcleaner;

ifyouuseanyrags,makesureyoucollect

allthese.

Keep screws and nuts oiled and protect

themwithgrease.

CLEANING AND ROUTINE MAINTENANCE OF

THE WOOD-FUELLED BOILER

Every day

- Removetheashesfromthelowercradle.

- Shakedown,withthescrapersuppliedwiththeboiler,

theemberssothattheashes,accumulatedinthere

bedwillfalldownthroughtheslotsinthegrate.This

operationwillpreventgrateobstructionandsubsequent

poor operation of the boiler.The operation is to be

carriedoutwhentheamediesdown,beforeloading

wood.

Every week

- Removecarefullyallcombustionresiduesaccumulated

intherewoodstoragecompartment.

- Usethesuppliedbrushtocleanthetriangularductsin

thecombustionchamber.

- Removetheashescontainedinthesmokechamber

fromthesidedoorsusingascraper.

- Makesurethattheslotsinthegratearenotobstructed:

iftheyare,clearthemupusingthepoker.

- Iftheboilercontinuestooperatebadly,evenafterhav-

ingcleaneditasdescribedabove,thecausecanbe

attributedtobaddistributionofthesecondaryair.

Inthiscase:

1)checkthe adjustmentofthe airsetting, accordingto

the instructions given in the paragraph“Combustion

airadjustment”.

2)ensurethetwosecondaryairsupplyholesintothegrate

housingarenotobstructed:iftheyare,useasoft brush

tocleanouteachduct.

Every month

Checkby-passoperation.

Whentheloadingdoorisopentheby-passallowsthefan

tostartupautomatically,extractingtheuegasaccumu-

latedinthewoodstoragecompartment,andconveying

ittothechimney.

Thebypass,inconclusion,allowsthesmoketobedis-

charged to the chimney without escaping from the top

doorwhenloadingthewoodorlighting.

UNSCHEDULED MAINTENANCE OF WOOD-FUELLED

BOILER

At the end of each heating season, perform a general

cleaningoftheboilerbyremovingalltheashesfromthe

rewoodstoragecompartment.

Duringsummer,keeptheboilerdoorsclosed.

Cleaning the fan

ATTENTION:

This operation is reserved for qualiﬁed

personnel as incorrect maintenance

could jeopardise operation of the boiler.

6.12 - TROUBLESHOOTING

Probe alarm signal:

Incaseoffailureordisconnectionofoneormoretemper-

atureprobes,thecontrolunitsignalsthattheyaremissing

indicating the number of the missing probe by a short

beepofthebuzzer.Toeliminatetheproblem,checkthe

connectionoftheprobeand/orreplaceit.

Maximum boiler temperature alarm signal:

Iftheboilerreachesthemaximumoperatingtemperature,

thealarmsoundsautomaticallyandthedisplayashes

indicatingthesafetystatus;atthesametimethecontrol

unitactivatesallenabledpumps,accordingtothetypeof

systemcontrolled, inorder todisperseexcessheat.To

silencethealarm,presstheBuzzersilencingkey

.

Boiler door open alarm signal:

Whenthewoodloadingdooropens,thebypassconnected

mechanicallyopensallowingthefantodirectlyextractthe

uegasatmaximumspeedthroughthebypass.

Afterthedoorhasclosed,thesystemcontinuesworking

automaticallyfollowingthepanelboard

logic.

Amicroswitchisconnectedtothebypassopeningsystem

whichisactivatedwhenthedooropens;thecontrollerwill

begintoemitaseriesofshortbeepsatregularintervals

andthemessage“BOILERDOOROPEN”willappearat

thebottomofthedisplay.

•The fan will run at full speed to extract the ue gas

throughthebypass.

•Afterthedoorhasclosed,thesystemcontinuesworking

automaticallyfollowingthepanelboardlogic.

Justclosethedoortosilencethealarm.

Rememberthatkeepingthedooropenforlongperiods

“duringreloading”,coulddeformtheuegasextraction

impeller.

Faulty probe temperature measurement:

Should one or more probes supply faulty temperature

measurements, try to replace it/them; also check to

ensurenovoltagereachestheinputofapossiblechron-

othermostat.

Incaseoffaultyreadings,trytodisconnectthewiresfrom

thechronothermostatinput.

Safety device trip:

Whenthesetboilerwatertemperaturehasbeenreached

(PARAMETER0),theboilerfanstops.

Ifthistemperatureisexceededandthetemperaturesetin

PARAMETER2isreached,anacousticalarmsignalwill

betriggeredandallpumpswillbeenabledtorun.

Whenthewatertemperatureofthesystemdrops,boiler

operationwill be restoredautomatically; ifonthe other

handthetemperatureincreasesbeyondthesafetyther-

mostatcalibrationvalue(100°C),standardoperatingcon-

ditionsmustberestoredmanuallybyresettingthesafety

thermostat:thekeyisontheleftsideofthepanelboard.

Power outage:

Safety is assured by the thermal discharge valve (the

mounting of which is mandatory for all solid fuel red

appliance)whichdisposesofexcessinertia.

  46033casteldario-mantova-italia-tel.+39037657001-fax+390376660556

inf

[email protected]-expor[email protected]-www.unical.eu

AG S.p.A.

00335320EN -1

ed.10/14

www.unical.eu

Unicalwillnotbeheldresponsibleforpossibleinaccuraciesduetotranscriptionorprintingerrors.

reservestherighttomodifyitsproductsasdeemednecessaryoruseful,withoutjeopardisingtheiressentialfeatures.

Unical FIREX 2S User manual

Brand: Unical

Model: FIREX 2S

Type: User manual

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Unical FIREX 2S User manual

Unical FIREX 2S User manual

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