Harman HydroFlex 60 Pellet Boiler - Creosote - Formation and Need for Removal

9
3-90-233R24_11/13
10
Total Lineal Feet Combined
Should Not Exceed 18' as
measured from the outlet.
0
2
6
4
8
68 4 2
5
Altitude in Thousands of Feet
10
Maximum Horizontal Run 8'
10
5
7
6
9
8
18
15
4
The Total Lineal Feet
Decreases as the
Altitude Increases
Venting
Useonly3”pelletventpipetoventyourpelletboiler.
A combustion blower is used to extract the combustion
gasesfromtherebox.Thiscreatesanegativepressurein
thereboxandapositivepressureintheventingsystemas
showninFig.4.Thelongertheventpipeandmoreelbows
usedinthesystem,thegreatertheowresistance,andthe
greaterthechanceforcreosoteaccumulation.Becauseof
thesefactswerecommendusingasfewelbowsaspossible
and18feetorlessofventpipe.Themaximumhorizontalrun
shouldneverexceed8feet.
Be sure to use wall and ceiling pass through ttings
(which are approved for pellet vent pipe ) when going
through combustible materials. Besuretouseastarting
collartoattachtheventingsystemtothestove.The starting
collar must be sealed to the stove ue collar with high
temp silicone caulking or aluminum tape, and screwed
into the units’ ue collar in a minimum of three (3) places.
Due to low exhaust temperatures, increasing the diameter
of the venting or exceeding the recommendations of the
venting graph, is strongly discouraged.
Fig. 4
12”
36”
-
+
Vent Pipe
3” pellet vent pipe(also known as “Lor PL” vent) is
constructedof twolayers withair spacebetween the
layers. This air space acts as an insulator and reduces the
outsidesurfacetemperaturetoallowaminimumclearance
tocombustiblesaslowas1inch.InCanadatheminimum
clearancetocombustiblesis3inches.Checkwiththeventing
manufacturertobecertainofspeciedclearances.
Thesectionsofpipelocktogethertoformanairtightseal
inmostcases;however,insomecasesaperfectsealisnot
achieved.Forthisreasonandthefactthattheunitoperates
with a positive vent pressure, we specify that all joints
within the structure should be secured with at least 3
screws, and sealed with silicone caulking.
Venting
Fig. 3
Creosote - Formation and Need for Removal -Whenwoodisburnedslowly,itproducestarandotherorganicvapors,
whichcombinewithexpelledmoisturetoformcreosote.Thecreosotevaporscondenseintherelativelycoolchimneyue
ofaslow-burningre.Asaresult,creosoteresidueaccumulatesontheuelining.Whenignited,thiscreosotemakesan
extremelyhotre.Thepelletventpipeshouldbeinspectedatleasttwicemonthlyduringtheheatingseasontodetermine
ifacreosotebuilduphasoccurred.Ifcreosotehasaccumulateditshouldberemovedtoreducetheriskofachimneyre.
Guidance on minimizing creosote formation and the need for periodic creosote removal:Thechimneyshouldbeinspected
duringtheheatingseasontodetermineifacreosotebuild-uphasoccurred.Ifasignicantlayerofcreosotehasaccumulated,
1/8”(3mm)ormore,itshouldberemovedtoreducetheriskofachimneyre.
NOTE: Use only 3” diameter type “L” or “PL” venting system.
Be sure to inspect and clean exhaust venting system frequently.