Harman® • Absolute63 Installation Manual_R17 • 2016 - ___ • 08/2320 3-90-999000I
H. Avoiding Smoke and Odors
Negative Pressure, Shut-down, and Power Failure:
To reduce the probability of back-drafting or burn-back in
the pellet burning appliance during power failure or shut-
down conditions, the stove must be able to draft naturally
withoutexhaustbloweroperation.Negativepressureinthe
housewillresistthisnaturaldraftifnotaccountedforinthe
pelletapplianceinstallation.
Heatrisesinthehouseandleaksoutatupperlevels.This
airmustbereplacedwithcoldairfromoutdoors,whichows
into lower levels of the house. Vents and chimneys into
basementsandlowerlevelsofthehousecanbecomethe
conduitforairsupply,andreverseundertheseconditions.
Outside Air
Anoutsideairkit is recommendedin all installations.The
OutsideAirKitmustbeorderedseparately.
Pernationalbuildingcodes,considerationmustbegivento
combustionairsupplytoallcombustionappliances.Failure
tosupplyadequatecombustionairforallappliancedemands
mayleadtobackdraftingofthoseandotherappliances.
• Whentheapplianceisroofvented(stronglyrecommended):
The air intake is best located on the exterior wall
oriented towards the prevailing wind direction during
theheatingseason.
• Whentheapplianceisside-wallvented:
Theairintakeisbestlocatedonthesameexteriorwall
as the exhaust vent outlet and located lower on the
wallthantheexhaustventoutlet.
Theoutsideairsupplykitcansupplymostofthedemands
ofthepelletappliance,butconsiderationmustbegivento
thetotalhousedemand.
House demand may consume the air needed for the
appliance.Itmaybenecessarytoaddadditionalventilation
tothespaceinwhichthepelletapplianceislocated.
ConsultwithyourlocalHVACprofessionaltodeterminethe
ventilationdemandsforyourhouse.
Vent Pipe
Besure touseapproved pelletvent pipe walland ceiling
pass-throughttingstogothroughcombustiblewallsand
ceilings.Besuretouseastartingcollartoattachtheventing
systemtothestove.Thestartingcollarmustbesecuredto
theuestubwithatleastthreescrews,andsealedwithhigh
tempsiliconecaulking.
4” stainless steel ex vent piping is only allowed for use
inmasonryreplacesandchimneysorfactorybuiltwood-
burningreplaceswithclassAmetalchimneys.
Pelletventpipeisconstructedoftwolayerswithairspace
betweenthelayers.Thisairspaceactsasaninsulatorand
reducestheoutsidesurfacetemperaturetoallowaclearance
to combustibles of only 1 inch. The sections of pipe lock
togethertoformanairtightsealinmostcases;however,in
somecasesaperfectsealisnotachieved.Forthisreason
and the fact that theAbsolute63 operates with a positive
ventpressure,wespecifythatthejointsalsobesealedwith
siliconeoraluminumtapeinadditiontothesealingsystem
usedbythemanufacturer.
Wherepassingthroughanexteriorwallorroof,usesilicone
tomaintainaneectivevaporbarrieratthelocationwhere
thechimneyorcomponentpenetratestotheexteriorofthe
structure.
Vent Congurations:
To reduce probability of reverse drafting during shut-
down conditions, Hearth & Home Technologies strongly
recommends:
• Installingthepelletventwithaminimumverticalrunof
vefeet.
• Installingoutsideair.
Topreventsootdamagetoexteriorwallsofthehouseand
topreventre-entryofsootorashintothehouse:
• Maintainspeciedclearancestowindows,doors,andair
inlets,includingairconditioners.
• Ventsshouldnotbeplacedbelowventilatedsots.Run
theventabovetheroof.
• Avoidventingintoalcovelocations.
• Ventsshouldnot terminateunder overhangs, decksor
ontocoveredporches.
• Maintain minimum clearance of 12 inches from the
ventterminationtotheexteriorwall.Ifyouseedeposits
developing on the wall, you may need to extend this
distancetoaccommodateyourinstallationconditions.
Hearth & Home Technologies assumes no responsibility
for, nor does the warranty extend to, smoke damage
caused by reverse drafting of pellet appliances under
shut-down or power failure conditions.