Vermont Castings Montpelier Mounting instructions

Do Not Discard This Manual: Retain for Future Use
30004403 7/08 Rev. 4
Montpelier
Medium Insert
For Use in North America
SAFETY NOTICE: IF THIS APPLIANCE IS NOT PROPERLY INSTALLED, OPERATED AND MAIN-
TAINED, A HOUSE FIRE MAY RESULT.
TO REDUCE THE RISK OF FIRE, FOLLOW THE INSTALLATION INSTRUCTIONS. FAILURE TO
FOLLOW INSTRUCTIONS MAY RESULT IN PROPERTY DAMAGE, BODILY INJURY OR EVEN
DEATH. CONTACT LOCAL BUILDING OFFICIALS ABOUT RESTRICTIONS AND INSTALLATION
INSPECTION REQUIREMENTS IN YOUR AREA.
Homeowner’s
Installation
and Operating
Manual
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2
Montpelier Medium Insert
30004403
Introduction
Save These Instructions for Future Reference
The Montpelier Medium Insert is designed,
tested and listed for burning wood. Do not
burn other fuels.
The Montpelier Medium Insert is not listed
for mobile home installations.
Failure to follow these instructions may
result in property damage, bodily injury or
even death.
WARNING
This stove has not been tested with an
unvented gas log set. To reduce the risk of
fire or injury, do not install an unvented gas
log set into this fireplace.
Specifications ......................................................... 3
Installation .............................................................. 4
Operation ................................................................ 9
Maintenance ......................................................... 13
Optional Accessories ............................................ 16
Replacement Parts ............................................... 17
Warranty ............................................................... 19
Table of Contents
Proposition 65 Warning: Fuels used in gas, wood-
burning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known
to the State of California to cause cancer, birth de-
fects and other reproductive harm.
California Health & Safety Code Sec. 25249.6
Thank you for purchasing a Vermont Castings Montpelier Medium Insert, an efficient wood stove carefully engineered
to bring you the latest in wood combustion principles and modern foundry technology.
This stove transforms a traditional masonry fireplace into a powerful heater. You can count on years of comfortable
heating and pleasurable fire-viewing if you operate and maintain it according to the directions in this Owner’s Guide.
This Insert has been tested and listed by OMNI-Test Laboratories of Portland, Oregon to ANSI/UL 1482 for the United
States and ULC S628 for Canada. This Insert is listed to, and in compliance with, the standards set forth by the
Federal Environmental Protection Agency, 40 CFR Part 60.532(b), as stated on the permanent label attached to the
stove.
This manual describes the installation and operation of this Insert. This heater meets the U.S. Environmental Protec-
tion Agency’s emission limits for wood heaters sold after July 1, 1990. Under specific test conditions this heater has
been shown to deliver heat at a rate ranging from 10,100 to 27,550 BTU/hr.
For more complete details on stove performance and specifications, please refer to Page 3.
The Montpelier Medium Insert is designed, tested and listed for burning wood. Do not burn other fuels.
Installation or service of the Montpelier Medium Insert should be performed only by a qualified installer, preferably NFI
or WETT (Canada) certified.
Please read entire manual before you install and use your new Insert.
Failure to follow these instructions may result in property damage, bodily injury or even death.

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Montpelier Medium Insert
30004403
Specifications
Montpelier Medium Insert
EPA Emissions Rating .......................................3.0 g/hr
Range of heat output* ............. 10,100 - 27,550 BTU/hr
Maximum heat output** ..........................50,000 BTU/hr
Area heated*** ............................................ 1,500 sq. ft.
Size of wood splits ....................18”-22” (460 - 560 mm)
Fuel Capacity ........................................ 30lbs. (13.5kg)
Loading ..................................................................Front
Flue size ..................................................... 6” (150mm)
Fireplace Insert weight ....................... 335 lbs. (152 kg)
Primary Air Control ............................................ Manual
Glass panel ......................... High-temperature ceramic
Flue exit position ..................................................... Top
Blower rating ..............................150 cfm. (115V, 60Hz)
*Under specific test conditions used during EPA emis-
sions standard testing.
**This value can vary depending on how the unit is
operated, and the type and moisture content of the fuel
used. The figure shown is based on maximum fuel con-
sumption obtained under laboratory conditions and with
average efficiencies.
***These values are based on operation in building-
code conforming homes under typical winter climate
conditions in New England. If your home is of nonstan-
dard construction (e.g. unusually well insulated, not in-
sulated, built under ground, etc.) or if you live in a more
severe or more temperate climate, these figures amy
not apply. Since so many variables affect performance,
consult your Vermont Castings’ Authorized Dealer to
determine realistic expectations for your home.
Fig. 1 Montpelier Medium Insert dimensions.
17” (434 mm)
21”
(548 mm)
30” (774 mm)
28” (730 mm)
22”
(565 mm)
22” (564 mm)
11”
(292 mm)
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26” (680 mm) 14” (362 mm)

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Montpelier Medium Insert
30004403
Installing the Montpelier Medium Insert into an existing
masonry fireplace is an effective way to add an efficient
heater to your home. The existing fireplace and chim-
ney must meet certain requirements.
Requirements for Existing Fireplaces
The Montpelier Medium Insert is listed for installation
within a properly built masonry or heat circulating, ma-
sonry-type fireplace that is constructed in accordance
with the requirements of recognized building codes. A
heat-circulating masonry-type fireplace must conform
to building code standards for masonry fireplaces, and
must consist of a factory-built metal firebox with air
circulation pathways that are surrounded by masonry
materials. Air circulation pathways must not be blocked
by the insert or surround panels.
The fireplace and chimney must be clean and structur-
ally sound. Have them inspected by a qualified profes-
sional chimney sweep, a mason, or your Vermont Cast-
ings’ Authorized Dealer before the Montpelier Medium
Insert is installed. Any deterioration (cracks, loose
mortar or loose bricks) must be repaired.
Codes may permit removal of the damper in order to
make a positive vent connection between the firebox
and the chimney. However, the fireplace should not be
modified in any way without first checking with your lo-
cal building inspector or fire marshal. Provision should
be made to restore the fireplace to its original condition
if the insert is removed. Do not remove bricks or mortar
that may jeopardize the compliance of the fireplace with
local building codes.
The Montpelier Medium Insert is not listed for in-
stallation in factory-built fireplaces.
Installation
Requirements for Existing Chimneys
Chimney requirements differ for the U.S. and Canada.
Specifications for each are listed below. Connect the
insert to the chimney in accordance with local codes
and the requirements of the listing agency as specified
in this manual.
Chimney Height / U.S. and Canada
Chimney height should be no less than 15’ (4.5 m)
above the hearth and no more than 35’ (10.5 m).
The chimney should extend at least 3’ (914 mm) above
the highest point where it passes through a roof, and at
least 2’ (610 mm) higher than any portion of a building
within 10’ (3 m). (Fig. 2)
Do not connect your Montpelier Medium insert to a
chimney flue serving another appliance.
U.S.
In the U.S. (ANSI/NFPA 211, 1988), when
installed in a masonry fireplace:
• A connector must extend from the flue collar
to the flue liner.
• If a stainless steel liner is not used, the connec-
tor must extend at least four (4) feet from the flue
collar of the insert.*
• The cross sectional area of the flue must be less
than or equal to three times the area of the flue
collar. If larger, the chimney must be re-lined.
• Means must be provided to prevent room air
passing to the chimney cavity.
• Provision must be made for removal of the
insert to clean the chimney flue.
General Considerations / U.S.
• While not required in most jurisdictions in the
U.S., MHSC strongly recommends that a full
stainless steel chimney liner be installed for the
insert to the chimney top to increase overall per-
formance and to ease and reduce yearly mainte-
nance.
• A masonry chimney must be well-constructed
and must meet minimum code requirements.
The chimney flue should have a code-approved
liner made of masonry or pre-cast refractory
tiles, straight or flexible stainless steel pipe, or a
poured-in-place liner. An unlined chimney must
be relined professionally.
• The chimney must have a nominal flue size of
6” (152 mm) diameter or 28 square inches (181
cm2) but no greater than 3 times larger or 85
square inches (548 cm2). A chimney larger than
this must be re-lined.
2' Min.
2' Min.
3'
Min.
0 To 10'
3'
Min.
0 To 10'
AC617
RLTSKC8
2/11/98

AC617
Reference
Point
Fig. 2 The 2’-3’-10’ rule for chimneys.
* This requirement is in addition to those specified in ANSI/NFPA211.

5
Montpelier Medium Insert
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Be aware that a chimney originally designed for fire-
place use may perform differently when used to vent
an air-controlled appliance such as your Montpelier
Medium Insert - even if the flue is less than 3 times
larger than the flue collar. For example, a chimney on
an outside wall may not heat up enough to sustain an
adequate draft. Such a flue can often be improved if it
is relined to reduce its size and/or insulated to keep it
warmer.
• A positive flue connection must be made between
the Insert and the first masonry tile or prefabri-
cated metal chimney section. A positive flue con-
nection consists of a plate that seals or replaces
the fireplace damper and a section of chimney
connector that passes through the plate into the
chimney.
• The chimney connector must be a minimum
equivalent to a 6” (152 mm) diameter opening
and must be 24 gauge or heavier stainless steel.
The connector must extend four (4) feet mea-
sured from the collar of the insert.
Chimney Connection systems are available from a
variety of manufacturers. Your Vermont Castings dealer
can recommend a system that will best meet the re-
quirements of your particular installation.
Sealing Requirements / U.S.
• The chimney must be sealed off from room air,
either by a plate at the damper level or by sealing
the fireplace opening.
• Unused openings to the flue must be sealed with
masonry to the thickness of the chimney wall.
Openings sealed with pie plates or wallpaper are
a hazard. In the event of a chimney fire, flames
and smoke may be forced from the openings.
Canada
In Canada (CAN/CSA-B365-M91, Section 5), wheth-
er installed in a masonry or factory built fireplace:
• A full chimney liner meeting ULC S635, Class III
(stainless steel) must be installed from the insert
to the chimney top, and securely attached to
both. The damper may be removed to accommo-
date the liner.
• The opening of the fireplace around the insert
must be sealed to prevent room air passing to the
fireplace cavity.
• Existing air-circulation chambers in a fireplace
with a steel liner may not be blocked.
• Provision must be made for removal of the insert
to clean the chimney flue.
• The existing fireplace damper (if any) should be
locked in the open position.
• A permanent metal warning label must be affixed
to the back of the fireplace stating the fireplace
may have been altered to accommodate the
insert, and may be unsafe to use as a conven-
tional fireplace. (A Fireplace Modification Tag is
included in the hardware bag inside the Montpe-
lier Medium Insert.)
Minimum Fireplace Dimensions
The Montpelier Medium Insert will fit most fireplaces.
To confirm that it will fit yours, measure the lintel depth,
plus the height, width, and depth of your fireplace and
hearth. Compare them to the measurements in the ac-
companying chart. If you choose to install a new hearth
over an existing fireplace hearth, be sure to take its
thickness into consideration when measuring both front
and back height of the fireplace and clearances to any
existing trims and mantels.
The unit can be installed virtually flush with the fireplace
opening or it can extend 3” (76 mm) onto the hearth
using the optional 3” Hearth Extension Kit. Figure 3
gives minimum and maximum dimensions for fireplaces
which will accommodate the Montpelier Medium Insert
in the flush mount configuration and using the optional
extension kit.
NOTE: The clearance between the Montpelier Medium
Insert and the mantel, top trim and side trim cannot be
reduced by installing shields.
Another requirement to consider is the clearance for
movable items such as tables, bookcases, rugs, furnish-
ings, and your woodbox. All combustible materials of
this type should be a minimum of 48” (1220 mm) from
the front surface of the Montpelier Medium Insert. Be
sure that family members are aware of this requirement
as well, so they too will keep objects a safe distance
from the Montpelier Medium Insert.

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Montpelier Medium Insert
30004403
A,I
BC
D,J
E
D,J
H
CE
FP1084
winterwarm
fireplace minimum dimensions
3/01
Fireplace Minimums
3” Extended
Flush Mount Mount
A. Width at Face 27” (686 mm)
B. Width at Dimension ‘C’ 22¹⁄₂” (572 mm) 22¹⁄₂” (572 mm)
C. Depth1 17¹⁄₂” (445 mm) 14¹⁄₂” (368 mm)
D. Height at Face 21¹⁄₂” (546 mm) 21¹⁄₂” (546 mm)
E. Height at Dimension ‘C’ 21¹⁄₂” (546 mm) 21¹⁄₂” (546 mm)
FP1084
Fireplace Maximums
H. Lintel depth 8¹⁄₂” (216 mm)
I. Width2 41¹⁄₂” (1054 mm)
J. Height2 28¹⁄₂” (724 mm)
1. The minimum depth must be maintained from the floor of the fireplace
to a height of 21¹⁄₂” (540 mm)
2. Though the Montpelier Medium Insert will fit into larger fireplaces, the
decorative optional MHSC Surround Panels will not completely cover the
fireplace opening if these dimensions are exceeded. Custom made trim
pieces may be used.
Fig. 3 Use these measurements to confirm that the Montpelier
Medium Insert will fit into your masonry fireplace.
Clearance Requirements
After confirming that your fireplace is the right size,
check the clearance to combustibles. First mark with
tape the exact center of your fireplace opening on the
hearth. Measure the side clearance from this point.
Measure the top trim and/or mantel clearances from the
finished hearth surface. Measure the front clearance (to
furnishings, etc.) from the fireplace face. (Fig. 4)
X
FP1085
WinterWarm
clearances
3/01
C
A
B
Measure
side trim
clearance
from here
FP1085
Fireplace Clearances
3” Extended
Flush Mount Mount
A. Mantel 47¹⁄₂” (1207 mm) 44¹⁄₂“ (1130 mm)
B. Top Trim (1¹⁄₂”) 47¹⁄₂” (1207 mm) 36¹⁄₂” (927 mm)
C. Side Trim* 21” (533 mm) 21” (533 mm)
* Where side trim extends more than 1 ¹⁄₂ ” (38 mm) from the fire-
place facing, the side clearance must be no less than 26¹⁄₂” (673
mm); this is also the required side wall clearance.
Measure the side clearance (C) from the exact center of your fire-
place opening on the hearth (X). Measure the top trim (B) and/or
mantel clearances (A) from the finished hearth surface. Measure
the front clearance (to furnishings, etc.) from the fireplace face.
Fig. 4 Observe these clearances to combustible trim.
Hearth Requirements
In some fireplaces, the hearth in front of the fireplace
opening is brick, stone, slate, or some other non-com-
bustible material that is in direct contact with concrete
poured over earth. These are the only hearths that are
considered noncombustible. In other fireplaces, the
brick or concrete hearth in front of the fireplace opening
is supported by heavy wooden framing. Because nei-
ther brick nor concrete has good insulating properties,
heat radiated by the fire will pass downward through
the hearth to the wooden framing. Such hearths are
considered combustible.
Unless the fireplace and hearth are constructed over a
completely non-combustible surface (such as unpainted
concrete over dirt), a thermal floor protector must be
used in front of and to the sides of the door as protec-
tion against spilled coals and embers and heat radiated
from the front of the insert. Floor protectors must extend
at least 8” (203 mm) from the side of the insert, making
the protector 44³⁄₄” (1137 mm) wide.
In addition, the floor protector must extend from the
front door opening a minimum of 16” (406 mm) in the
United States and 18” (457 mm) in Canada. (Fig. 5)
The approved construction of a floor protector calls
for a minimum of 24 gauge galvanized sheet metal or
equivalent, and the equivalent of 1.25” (32 mm) of a
material with k-value of 0.84 or less.
Custom-made floor protectors may be used if they
offer the same protection. Millboard has a standard k
value of 0.84 and thus 1¹⁄₄” (32 mm) of this material is
adequate thermal protection. Custom-built floor protec-
tors must have a k value equal to, or less than 0.84,
meaning that heat will transfer at the same rate or more
slowly than the tested standard.

7
Montpelier Medium Insert
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How to Determine if Alternate Floor
Protection Materials are Acceptable
All floor protection must be noncombustible (i.e. met-
als, brick, stone, mineral fiber boards, etc.). Any organic
materials (i.e. plastics, wood paper products, etc.) are
combustible and must not be used. The floor protection
specified includes some form of thermal designation
such as R-value (thermal resistance) or k-factor (ther-
mal conductivity).
Procedure:
1. Convert specifications to R-value:
i. R-value given - no conversion needed.
ii. k-factor is given with a required thickness (T) in
inches:
iii. K-factor is given with a required thickness (T) in
inches:
iv. r-factor is given with a required thickness (T) in
inches: R = r x T
FP1095
hearth protection
2/08 djt
A
B
C
B
United States Canada
A. 18”* (460 mm) 18” (460 mm)
B. 8” (203 mm) 8” (203 mm)
C. 44³⁄₄” (1137 mm) 44³⁄₄” (1137 mm)
FP1095
Fig. 5 Unless your fireplace and hearth are constructed over
a dirt floor (or unpainted concrete over dirt), you must use a
floor protector that satisfies the above requirements.
Typically, thermal protection with the above dimensions will be
required. The equivalent of 1.25” (32 mm) of a material with a k-
value 0.84 (or a total R-value of 1.49) is necessary.
If the insert is elevated 8¹⁄₂” (216 mm) or more above a combus-
tible hearth, thermal protection is not needed. However, spark and
ember protection is still necessary.
*If the insert is elevated 3” (76 mm) or more, this dimension may
be reduced to 16” (406 mm) (US only) beyond which no thermal
protection is necessary.
2. Determine the R-value of the proposed alternate
floor protector:
i. Use the formula in Step 1 to convert values not
expressed as R.
ii. For multiple layers, add R-values of each layer to
determine overall R-value.
3. If the overall R-value of the system is greater than
the R-value of the specified floor protector, the alter-
nate is acceptable.
EXAMPLE: The specified floor protector should be 1¹⁄₄-
inch thick material with k-factor of 0.84. The proposed
alternate is 4” brick with an r-factor of 0.2 over 1/4”
mineral board with a k-factor of 0.29
Step a: Use formula above to convert specification to
R-value:
Step b: Calculate R of proposed system.
4” brick of r = 0.2, therefore:
Rbrick = 0.2 x 4 = 0.8
1/8” mineral board of k = 0.29, therefore
Rmineralboard = x 0.25 = 0.431
Rtotal = Rbrick + Rmineralboard = 0.8 + 0.431 = 1.66
Step c: Compare proposed system Rtotal of 1.66 to
specified R of 1.49. Since proposed system Rtotal is
greater than required, the system is acceptable.
Definitions
R = x T
1
K x 12
R = x T = x 1.25 = 1.49
1
k
1
0.84
1
0.29
r = =
(ft2)(hr)(°F)
(Btu)(in)
1
k
(Btu)(ft)
(ft2)(hr)(°F)
K =
k = = K x 12
(Btu)(in)
(ft2)(hr)(°F)
R = (ft2)(hr)(°F)
Btu
R = x T
1
k
Optional Surround Packages
Custom-made surround panels may be made from any
noncombustible material.
MHSC offers both steel and cast iron Surround panel
kits, each in two sizes.
Enclosure Area
Georgian Cast Surround:
30DVSGTKCB, 30DVSGTKB
........................................ 30¹⁄₄ x 41 (768 x 1041 mm)
Mead Cast Surround:
MEAD3CB, MEAD3EB, MEAD3BS
................................ 28¹⁄₄” x 41¹¹⁄₁₆” (718 x 1059 mm)
Caprice Cast Adjustable Profile Surround:
CAPCB, CAPEB ................25” x 35” (635 x 889 mm )
Bevel Cast Trim Surround:
LHEABSL ...................27⁷⁄₈” x 40³⁄₄” (708 x 1035 mm)
Steel Surround:
LHE30SSB .................... 27” X 38¹⁄₄” (686 X 972 mm)
LHE30SLB, LHE30SLGA ...........................................
......................................28¹⁄₄” x 41” (718 x 1041 mm)

8
Montpelier Medium Insert
30004403
Installing the Montpelier Medium Insert
1. Remove or Disable the Fireplace Damper. If codes
allow, remove the damper. Many dampers can be
removed simply by removing a cotter pin and/or a
set screw.
If it is not permissible or possible to remove the
damper, secure the damper in the fully open posi-
tion.
~ NOTE: CANADIAN INSTALLATIONS ~
In accordance with CAN/CSA B365-M91, you must
permanently secure the Fireplace Modification Tag
to the rear of the fireplace cavity if you have modi-
fied the fireplace in any way to accommodate instal-
lation of a fireplace insert. This tag is in the hardware
bag included with your Insert.
2. Install the Floor Protector. Make sure the floor pro-
tector satisfies the requirements discussed on Page
6. The finished height of the floor protector or raised
hearth needs to be considered before installing the
venting system.
3. Flue collar orientation: The flue collar may be ori-
ented in the vertical position or rotated 180 degrees
on the top of the stove resulting in a 26 degree back-
ward angle. If possible, determine beforehand which
orientation will work best for your application.
In most applications, cleaning of the chimney system
will be easiest from the top (chimney cap) down. If this
is the planned method for your application, the center
iron pull down handle on the flue collar serves as pro-
tection to keep prevent a chimney brush from damag-
ing the baffle inside the stove. If cleaning can only take
place from inside the home, the center bar may be cut
out of the flue collar using a hack saw or reciprocating
metal cutting saw.
4. Install the venting system: Again, depending on
your application it may be easiest to install the con-
nector or stainless steel flue liner in the chimney first.
Refer to Figure 6 for the components of the venting
system.
• Carefully remove the fiber baffle by first remov-
ing the front air tube. If necessary, removing the
remaining air tubes will allow easier access.
• Remove the iron flue collar from the stove and
fasten either the adapter pipe or flue liner to it by
drilling three holes using the holes in the iron col-
lar as a guide.
• Secure the flexible pipe to the pipe adaptor using
the same method.
• Install the connector pipe or liner so that the
height measured from the finished hearth surface
to the center bar of the flue collar is 19” (483
mm). (Fig. 7) This will allow an easy connection
once the stove is rolled into place.
5. Route the blower power cord. Run the power cord
out the left or right side of the insert. Remove the
cover plate and insert the provided grommet into the
slot. Reattach the cover plate.
6. Install the Optional Surround Kit. Follow the in-
structions provided with the kit.
7. Roll the Firebox into Position. At least two people
will be needed to move the firebox. Lift the front of
the stove slightly to put weight on the rear wheels
to ease installation. Position the firebox so the flue
collar lines up with the connector. Use the leveling
screws at the front of the Insert to adjust the level.
Route the power cord to the side nearest the power
supply and test the fans.
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

ST1002
Fig. 6 Components of the venting system.
Flexible Flue Liner
Flex Liner Adapter
(if required)
Adjustable (26” or verti-
cal) Flue Collar w/Inte-
grated Draw-Down Bar
Top of the Insert Around
Flue Opening
Washers 1/4 Dia.
1/4-20 Hex Nuts
ST1003
Fig. 7 Measured height from the finished hearth surface to
the center bar of the flue collar.
19’
(483 mm)
Ref. 26”
ST1003
finished height
3/08

9
Montpelier Medium Insert
30004403
8. Connect the Flue Collar. : From inside the stove,
reach up and pull the flue collar into place by lining
up the two 1⁄4” studs in the stove top. Care should
be taken to not disturb the gasket which seals the
collar to the top. Tighten the two 1⁄4” nuts.
• Replace the three rear stainless steel air tubes
by sliding them first to the right and then into the
mating holes on the left. Secure these in place
with the stainless steel cotter pins.
• Before installing the front air tube, replace the
fiber baffle board and ensure it slides all the way
to the back. There should be a tight fit between
the board and the iron sides of the stove.
Operation
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Air Control Lever
Fan Speed Control (Behind louvre)
FP1099
Fig. 8 Montpelier Medium Insert controls.
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
Air Control Lever
ST1000
Open - Control Lever to the Left
Closed - Control Lever to the Right
Fig. 9 The air control lever controls the amount of air entering
the firebox.
Your Insert’s Controls and What They Do
All Montpelier Medium Insert controls are conveniently
located on the front. (Fig. 8)
Two controls regulate the performance of your Montpe-
lier Medium Insert:
The primary air control supplies oxygen for the fire.
The variable-speed fan control, or rheostat, regulates
the warm air flow into the room.
Primary Air Control
A single air control regulates the amount of heat the fire
will produce and how long it will burn.
The primary air control lever is located on the upper
left side on the front of the insert. The lever regulates air
for starting, maintaining, and reviving the fire.
Generally, more air entering the stove makes the fire
burn hotter and faster, while less air prolongs the burn.
The Montpelier Medium Insert’s air supply is increased
when the control lever is moved to the left, and de-
creased when moved to the right. It may be set any-
where between the two extremes, depending on the
amount of heat desired. (Fig. 9)
To complement the manual setting of the air control, the
Montpelier Medium Insert has an integral convection
air blower that ensures an even delivery of heat at the
manual setting you select.
The Fans
The convection fan delivers a steady stream of warm air
into the room. Use the fan speed control to regulate the
flow of air into the room. A thermal switch will automati-
cally de-activate the fan when the stove cools down.
When starting a fire in a cold stove, this switch will typi-
cally energize the fan within about 20 minutes, after the
stove heats up.
The fan speed should be set at “low” (fully closed) when
operating at low to medium burn rates and may be set
anywhere between “low” and “high” when operating at
high burn rates. (Refer to Figure 10 for fan access)
• Replace the front air tube and secure it in place
with the cotter pin.
9. Connect the Blower power cord to the power
supply. DO NOT ROUTE THE POWER CORD UN-
DER OR IN FRONT OF THE UNIT.
This completes installation of your Montpelier Medium
Insert.

10
Montpelier Medium Insert
30004403
Burn Only High-Quality Wood
The Montpelier Medium Insert is designed to burn
natural wood only; do not burn fuels other than that for
which it was designed.
You’ll enjoy the best results when burning wood that
has been adequately air-dried. Avoid burning “green”
wood that has not been properly seasoned or cordwood
that is more than two years old.
The best hardwood fuels include oak, maple, beech,
ash, and hickory that has been split, stacked, and air-
dried outside under cover for at least one to two years.
For areas that do not have a supply of hardwood, com-
monly burned softwoods include tamarack, yellow pine,
white pine, Eastern red cedar, fir, and redwood. These
too should be properly dried.
Your Montpelier Medium Insert will accept wood up to
18” (460mm). Longer wood pieces work better than
short ones.
Wood should be stored under cover to maintain dry-
ness. Even for short-term storage, however, keep wood
a safe distance from the heater and keep it out of the
areas around the heater used for re-fueling and ash
removal.
Use the Air Control Settings
that Work Best for You
No single air control setting will fit every situation. Set-
tings for each installation will differ depending on the
quality of the fuel, the amount of heat desired, and how
long you wish the fire to burn.
The control setting also depends on your particular
“draft,” or the force that moves air from the stove up
through the chimney. Draft is affected by such things as
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Speed Control
Open Bottom Louvre to
access Fan controls ST996
Fig. 10 Fan control access.
the length, type, and location of the chimney, weather,
local geography, nearby obstructions, and other factors.
Too much draft may cause excessive temperatures in
the Montpelier Medium Insert, and could even damage
internal components. On the other hand, too little draft
can cause backpuffing into the room or a very sluggish
fire.
How do you know if your draft is excessively high or
low? Symptoms of too much draft include an uncontrol-
lable burn or glowing-red cast iron. A sign of inadequate
draft is smoke leaking into the room through the stove
or chimney connector joints, low heat, and dirty glass.
In some newer homes that are well-insulated and
weather-tight, poor draft may result from insufficient air
in the house. In such instances, an open window near
the stove on the windward side of the house will provide
the fresh air needed.
When first using the stove, keep track of the settings
of the air controls. You will quickly find that a specific
setting will give you a fixed amount of heat. It may take
a week or two to determine the amount of heat and the
length of burn you should expect from various settings.
Most installations do not require a large amount of
combustion air, especially if adequate draft is available.
Do not for any reason attempt to increase the firing
of your heater by altering the air control adjustment
range outlined in these directions.
Use the following primary air control lever and fan
speed control lever settings as a starting point to help
determine the best settings for your installation.
Montpelier Medium Insert Control Settings
Primary Air Air Circulation
Burn Control Fan Control
Rate Setting Speed Position
High Fully left High Horizontal
Medium 1” from Low Turn clockwise
full right
Low Fully right Off Turn counterclockwise