Manual Vermont Castings Dauntless FlexBurn (page 19 of 28) (English)

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Vermont Castings • Dauntless FlexBurn Owner’s Manual_R17 • 2020 - ___ • 09/23 193-90-586000C

When to Suspect a Combustor Problem

The best way to evaluate the performance of your Dauntless

FlexBurn’s combustor is to observe the amount of smoke

leavingthechimney—bothwhenthecombustorhas“lighted-

o󰀨”andwhenithasnot.Followthesesteps:

• Witharegoingandthecombustorproperlyactivatedand

the damper closed to route smoke through it as described

in the Operation Section, go outside and observe the

smoke leaving the chimney.

• Then, open the stove damper and once again check the

smoke leaving the chimney.

You should see signicantly more smoke when the stove

damper is open and exhaust does not pass through the

combustor.However,becarefulnottoconfusesmokewith

steam from wet wood. Steam dissipates in the air quickly;

smokedoes not. Remember that a hot stovewith a 2”-3”

established coal bed is required for catalytic combustion to

occur.

Ifthistestindicatesaproblem,considerotherpossiblefactors

as well, such as the weather or a change in the quality of

yourfuel.Inwarmweather,draftisweakerthanitisincolder

winterweather,andrescanburnsluggishly.Small,hotres

are a good solution under these conditions.

Figure 3.8-Inspectthecatalyticcombustor.

Catalyst

Access Door

Also, consider any changes in your operating routine.

Onceyouhaveruledoutanyotherpossible causes for a

decline in performance, inspect and clean the combustor if

necessary. Be sure to protect any surface you use for setting

the stove parts aside.

Inspecting the Combustor

Removeaccessdoorandinnerrebrick.Removethecatalytic

combustor by lifting up and pulling towards you, Figure 3.8.

NOTE

Burning“green”(insu󰀩cientlyseasoned)woodwillresult

in poorer performance than burning properly seasoned

fuel. Reloading with green wood can also thermal shock

the catalyst, resulting in cracking, or the eventual fallout,

of the honeycomb substrate. You may have to run your

stovehotter(moreair)toachieveacceptableperformance

using green or wet wood.

Cleaning the Optional Combustor

1. Check the combustors honeycomb-like catalyst for a

buildup of y ash. If any is evident, take the catalyst

outside and clean it by blowing air gently through it. Do

not push anything through the honeycomb; the combustor

should be cleaned by forcing air through the combustor

toremoveyashusingavacuumorcanofcompressed

air.

2.Inspectthecatalystfordamageordegradation.Although

small hairline cracks will not a󰀨ect performance, the

catalyst should be essentially intact. If the catalyst is

broken in pieces or has sections missing, it should be

removed or replaced. Call your local Vermont Castings

Authorized Dealer for a replacement catalyst.

3.Ifthecatalystisingoodconditionandclean,re-installit

in the stove and replace the refractory access door.

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Vermont Castings Dauntless FlexBurn Manual

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