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Vermont Castings  •  Dauntless FlexBurn Owner’s Manual_R3  •  2020 - ___ •  05/20

10

3-90-586000c

The catalyst will initiate combustion of smoke and particulates 

at 500° - 600°F (260° - 315°C), half the temperature normally 

required for unaided secondary combustion. If you followed 

the startup operation steps in the previous section the stove 

will be sufficiently hot to allow the combustor to work. Once 

the combustor starts working, heat generated by burning 

the smoke will keep it working.
To determine whether the combustor is operating, refer to 

the temperature probe which shows the operating range of 

the catalytic combustor. This is located on the back of the 

stove and is viewed from the top.

NOTE:

 It will take several minutes after closing the bypass 

damper for the temperature probe to fully adjust to the new 

temperature.  If  the  probe  indicator  is  below  the  operate 

catalyst range, add fuel or open the bypass damper to allow 

the fire to further build before engaging the catalyst again. 
If the probe indicator is above the operate catalyst range, 

the catalytic combustor is running too hot and may be 

damaged. In many cases, decreasing the primary air can 

reduce the catalyst temperature and adding less wood with 

each loading can also help if overheating is persistent. Do 

not add wood to the stove if the probe reads above the 

operate catalyst range. 

Avoid using a full load of very dry wood in the firebox, such 

as dry slab wood or wood with below 14% moisture content. 

This may result in continuous very high temperatures in the 

secondary combustion area and damage the combustor.
Never burn treated wood, garbage, solvents or trash. All of 

these may poison the catalyst and prevent it from operating 

properly. Never burn cardboard or loose paper except for 

kindling purposes. Never burn coal; doing so can produce 

soot  or  large  flakes  of  char  or  fly  ash  that  can  coat  the 

combustor and cause smoke to spill into the room. Coal 

smoke can also poison the catalyst so that it won’t operate 

properly. 

NOTE:

 The catalytic combustor is fragile and will crack if 

subjected to thermal shock. Thermal shock can occur when 

refueling with wet wood or closing the bypass damper too 

early after refueling.

For  best  results  when  refueling,  wear  long-cuffed  stove 

gloves to protect your hands and forearms.

Reloading a hot stove:

When a wood load is added to a hot bed of coals (continuous 

use), open the bypass damper and either the top or front 

loading doors. Stir the hot coals to allow ash to fall through 

the grate. Hot coals should then be pushed against the rear 

wall and leveled depending on the amount of coals. Add 

fresh wood and close the loading door and bypass damper. 

If the coals are glowing and hot, it is possible to set the air 

control to any setting immediately after loading the stove.

Reloading a warm stove:

If  the  stove  is  relatively  cold  (for  instance  after  a  long 

overnight burn), the coal bed may need to be re-energized 

prior to adding a large load of wood. Open the bypass damper 

and either the top or front loading door. Stir the coals to 

allow ash to fall through the grate. Push the remaining coals 

toward the rear wall. Close the door(s) and bypass damper 

and set the primary air to the highest position. Allow the 

coals to re-ignite and heat the system for 10 to 15 minutes. 

Once the coals are glowing, a fresh batch of wood may be 

added following the “hot stove” procedure above.

A proper bed of coals is critical to the performance of the 

Dauntless stove. The rear refractory wall of the stove should 

be almost entirely white in color with proper operation. This 

indicates the combustion system is running at a proper 

elevated temperature. If the rear wall is black with creosote 

or develops a dark brown color, it is likely that the coal bed 

is not sufficiency large enough or hot enough. Revisit the 

above instructions and adjust the amount of kindling or time 

at high air settings to get the system hotter. Wood size or 

excessive moisture may also cause lower than desirable 

stove temperatures.
While not required, operating your stove with the catalytic 

combustor installed creates optimum conditions for 

secondary combustion and will increase your efficiency up 

to 15% on low burn, making sure you get the most heat out 

of each load of wood.

The  catalytic  element  is  a  “honeycomb”  coated  with 

the catalytic material. The element sits at the bottom 

of the secondary combustion chamber. Smoke, gases 

and particulates that are not fully combusted during the 

secondary combustion process pass through the catalyst, 

creating a tertiary burn. This results in higher efficiency and 

lower emissions.

WARNING

!

DO NOT OPERATE THE STOVE WITH THE ASH 

DOOR OPEN. OPERATION WITH THE ASH DOOR 

OPEN CAN CAUSE AN OVER-FIRING CONDITION TO 

OCCUR. OVER-FIRING THE STOVE IS DANGEROUS 

AND CAN RESULT IN PROPERTY DAMAGE, INJURY 

OR LOSS OF LIFE.

Clockwise to Open

Counterclockwise 

to Close

Figure 2.6

 - To open the front doors, turn the handle clockwise.

Summary of Contents for Dauntless FlexBurn Catalytic

Page 1: ...ids in the vicinity of this or any other appliance Do not over fire If appliance or chimney connector glows you are over firing Over firing will void your warranty Comply with all minimum clearances t...

Page 2: ...els may make the Catalyst in the combustor inactive The combustor is fragile handle carefully The durability of the catalytic device has not been evaluated as part of the certification Danger Risk of...

Page 3: ...sting and Important Safety Information A Appliance Certification 6 B BTU Efficiency Specifications 6 C California 6 D Mobile Home Approved USA ONLY 6 E Glass Specifications 6 2 Operating Instructions...

Page 4: ...occurs earlier However the warranty shall commence no later than 24 months following the date of product shipment from HHT regardless of the installation or occupancy date The warranty period for par...

Page 5: ...r improper handling 4 improper operation abuse misuse continued operation with damaged corroded or failed components accident or improperly incorrectly performed repairs 5 environmental conditions ina...

Page 6: ...iance Modification of the appliance Installation other than as instructed by Hearth Home Technologies Installation and or use of any component part not approved by Hearth Home Technologies Operating a...

Page 7: ...thout notice Improper installation adjustment alteration service or maintenance can cause injury or property damage For assistance or additional information consult a qualified installer service agenc...

Page 8: ...t be open when starting or reviving a fire and whenever the griddle or doors are opened The damper is closed when the handle points down Smoke travels through the secondary combustion system where it...

Page 9: ...aper and dry kindling After most of the kindling has burned into coals 15 to 20 minutes open the front doors and push remaining coals and unburned wood against the rear wall Add several pieces of larg...

Page 10: ...use open the bypass damper and either the top or front loading doors Stir the hot coals to allow ash to fall through the grate Hot coals should then be pushed against the rear wall and leveled depend...

Page 11: ...An optional surface thermometer tells you when to adjust the air control and when to refuel Figure 2 7 Figure 2 7 Take temperature readings with a thermometer located in the middle of the griddle For...

Page 12: ...the top of the ash pan Check the level at least once a day Every few days clear any ash from the outer edges of the firebox Most of the ash will fall through the grate Stir the ash with a shovel or po...

Page 13: ...R ENGINE OIL WARNING Do NOTburn treated wood or wood with salt driftwood May generate carbon monoxide if burn material other than wood May result in illness or possible death Fire Risk Keep combustibl...

Page 14: ...e for safety reasons as well as performance Canadian law requires a matching liner to serve any stove or insert vented through a fireplace chimney in the US the National Fire Protection Association NF...

Page 15: ...before operating stove A Cleaning the Glass Replacement Most of the carbon deposits on the glass will burn off during hot fires However the ash residue that accumulates on the glass surface should be...

Page 16: ...nt door of the stove should close securely to prevent accidental opening and should close tightly to prevent air from leaking into the fire chamber The door handle will be positioned vertically when t...

Page 17: ...nnel Allow an extra 1 2 25 50 mm and mark the spot to be cut 4 Remove the gasket from the channel place it on a wood cutting surface and cut it at the marked spot with a utility knife Twist the ends s...

Page 18: ...he inner sides of bottom rear or pipe heat shields if your stove is equipped with them Clean surfaces are better heat reflectors than dirty surfaces Touch up the black paint Inspect for and remove ash...

Page 19: ...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 st...

Page 20: ...refer to Building a Fire Section Check for adequate vent height refer to Chimney Height Section Refer to Negative Pressure section Wood condition is too wet too large Use dry seasoned wood refer to S...

Page 21: ...Vermont Castings Dauntless FlexBurn Owner s Manual_R3 2020 ___ 05 20 21 3 90 586000c 5 5 Reference Materials Date of Service Performed By Description of Service A Service Maintenance Log...

Page 22: ...ing Manufacturing Date Active Dauntless 2 3 4 5 6 7 8 9 10 11 12 13 15 16 17 18 19 26 37 36 35 32 29 31 1 17 18 34 30 27 38 40 41 39 42 43 44 46 45 48 49 50 47 55 54 53 51 52 56 59 58 57 60 61 62 14 3...

Page 23: ...86134A 1 3 Handle Assembly Griddle 1 00 586170 Y Knob Griddle Maple Black 1600661 Bushing Griddle Handle Qty 2 req Pkg of 10 1201900 10 Gasket 5 16 Wire w Core 10 Ft 1 00 1203668 Y 2 Top Classic Black...

Page 24: ...her Pkg of 10 1202470 10 Nut Hex Pkg of 10 1203210 10 11 Side Left Classic Black 4 00 586123A Biscuit 4 00 586123 32A Majolica Brown 4 00 586123 31A Bordeaux 4 00 586123 33A Twilight 4 00 586123 30A L...

Page 25: ...10 3 30 3014 10 Y 25 Door Left Classic Black 4 00 586126A Biscuit 4 00 586126 32A Majolica Brown 4 00 586126 31A Bordeaux 4 00 586126 33A Twilight 4 00 586126 30A Gasket Door 5 16 Med 15 Ft 1 00 1203...

Page 26: ...ft Handle 30005301 32 3 Spring Washer Pkg of 10 63D0069 10 32 4 Flat Washer 10mm Pkg of 10 1202560 10 32 5 Pawl Assembly 30005157 Y 32 6 Nut Jam 3 8 16 Top Lock Pkg of 10 1203290 10 33 Ash Pan Bracket...

Page 27: ...6 x 1 2 3 31 5500 49 Primary Air Control Handle Assembly Wood Maple Black SRV1 10 586149 Y Thermostat Handle Knob Wood Maple Black 1600660 Round Head SL 8 32 x 2 Pkg of 10 1202560 10 50 Thermostat Stu...

Page 28: ...ng patents United States 5341794 5263471 6688302 7216645 7047962 or other U S and foreign patents pending We recommend that you record the following pertinent information for your heating appliance Da...

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