Harman Super Magnum Coal Stoker - Chimneys & Venting; Understanding Draft; Chimney Connector Installation; Wall Pass-Through Methods

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Do Not Burn Wet Coal!
Super-Magnum Coal Stoker Stove
3-90-02702R8_11/13
5
Chimneys & Venting
A. Draft
Draftiswidelymisunderstood.Itisimportantthatyou,the
stoveoperator,realizethatdraftisavariableeffect,nota
givenquantity.Stovesandchimneysdonothavedraft,yet
draftisthekeytoyourstove’sperformance.
Draft is a force, produced by an operating stove and the
chimneytowhichitisattached.Itiscreatedbyhotgases
risingupthechimney,creatingapressuredifferencebetween
theinsideofyourhomeandtheoutsideair.Itcontinually
movesfreshcombustionairintothestove,andhotexhaust
gasesoutofthestove;withoutthisconstantow,there
will go out.
Other factors, such as barometric pressure, winds, the
tightness of the home, the total inside chimney volume,
chimneyheightandthepresenceofventingdevicessuch
asexhaustfansalsoplayaroleinmaintaininganadequate
draft. Low barometric pressures, super insulated homes,
andexhaustfanscan reduce draft;windscanplayhavoc
withdraft;andtoolargeortoosmallachimneyvolumecan
cause reduced draft due to the excessive cooling or not
enoughroomtoventtheexhaustgases.Introducingoutside
airdirectlytothestovemayhelpremedyalowdraftproblem.
Somesignsofinadequatedraftaresmoking,odor,difculty
inmaintainingthere,andlowheatoutput.Overdraftcanbe
causedbyaverytallchimneyevenifitistherecommended
size, and can cause overring of your stove. Signs of an
overdraft include rapid fuel consumption, inability to slow
there,andpartsofthestoveorchimneyconnectorglowing
red.Itisimportantthatyoufollowthechimneyguidelinesin
thismanual,includingsize,type,andheighttoavoiddraft
problems.
Wheninstalledandoperatedaccordingtothismanual,this
unit will produce enough hot gases to keep the chimney
warmsothatadequatedraftismaintainedthroughoutthe
burncycle.
B. Chimney Connectors
Abarometricdamperisrecommendedforchimneysover15
feethigh,andmaybenecessarytoprevent over-drafting.
Installitintheconnector,approximately12inchesabovethe
ueexit.Thebarometricdampershouldbesetsothatthe
uedraftwillmaintain-.06to-.08inchesofwatercolumn.
The appliance may be installed with (.6 mm) 24 gauge
chimneyconnectorpipe.Thesizeoftheconnectorshould
be6inchtomatchthesizeoftheuecollaropening.Do not
use makeshift components.
Nopartofthechimneyconnectormaypassthroughanattic
orroofspace,closetorotherconcealedspace,orthrough
a oor or ceiling. Whenever possible, avoid passing the
connectorthroughacombustiblewall;ifyoumust,usean
approvedwallpass-through,describedlaterinthissection.
Assembletheconnectorbeginningattheuecollar,withthe
crimpedendspointingtowardsthestove(tokeepdebrisand
creosoteakesinsidethesystem).Eachjoint,includingthe
onetothestove’suecollarandtheonetothechimneyitself
shouldbesecuredwithatleastthreesheetmetalscrews,
amaximumof3inchesapart.A1-1/4"(32mm)overlapis
requiredateachjoint,includingtheuecollarattachment.
Nomorethantwo90degreeelbowsshouldbeused,andthe
totallengthofconnectorshouldnotexceed10feet(3m)All
horizontalrunsofconnectormusthaveaminimumupward
slopeof1/4"perfoot(20mmpermeter).
C. Wall Pass-thrus
Itmaybenecessarytopassthechimneyconnectorthrough
acombustiblewalltoreachthechimney.Dependingonyour
localbuildingcodes,andprovincialornationalcodes,there
are several choices for accomplishing this safely. Before
beginning your installation, contact local ofcials, and the
chimneymanufacturerforspecicrequirements.
Canada: Three methods are approved by the CSA. The
diagramshowsonemethodrequiringan18"(460mm)air
spacebetweentheconnectorandthewall.Itallowsuseof
oneortwocoversasdescribedinthediagram.Theother
twomethodsaredescribedindetailinthecurrentissueof
CAN/CSAB365,thenationalstandard.
United States:ThenationalcodeisNFPA211.Besureto
checkwithlocalauthoritiesbeforebeginningyourinstallation.
The NFPA (National Fire ProtectionAgency) permits four
methodsforpassingthroughacombustiblewall.Acommonly
usedmethodtopassthroughawalldirectlytoamasonry
chimneyistoclearaminimum12"(305mm)aroundtheentire
chimneyconnector,andllitwithbrickmasonrywhichisat
least3.5"(90mm)thick.Areclayliner,minimum3/8"(9mm)
wallthicknessmustrunthroughthebrickwalltothechimney
liner(butnotbeyondtheinnersurfaceoftheliner).Itmust
becementedinplacewithrefractorycement.Thismethod
isillustrated.Fordetailsontheotherthreeoptions,referto
themostrecenteditionoftheNFPA211code.