Merrimack
Large Insert

Homeowner’s
Installation
and Operating
ManualFor Use in North America

4671
Merrimack cover

Safety Notice: If this appliance is not properly installed, operated and maintained, a house fire may result.
To reduce the risk of fire, follow the installation instructions. Failure tofollow instructions may result in property damage, bodily injury or evendeath. Contact local building officials about restrictions and installation
inspection requirements in your area.

Do Not DiscardNous
This
Manual: Retain for Future Use
recommandons que nos appareils de chauffage
au bois soient installés et entretenus apr desprofessionnels qui ont été accrédités aux É.-U. par le
National Fireplace Institute® (NFI) comme étant desspécialistes du NFI en matière d’appareilsde chauffage
au ois, ou qui sont accrédités au Canada
dans le cadre du Programme

30004671 3/11 Rev. 4

Merrimack Large Insert

Introduction
Thank you for purchasing a Vermont Castings Merrimack Large Insert, an efficient wood stove carefully engineered tobring 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 UnitedStates and ULC S628 for Canada. This Insert is listed to, and in compliance with, the standards set forth by theFederal Environmental Protection Agency, 40 CFR Part 60.532(b), as stated on the permanent label attached to thestove.
This manual describes the installation and operation of this Insert. This heater meets the U.S. Environmental Protection 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 10,750 to 31,780 BTU/hr.
For more complete details on stove performance and specifications, please refer to Page 3.
The Merrimack Large Insert is designed, tested and listed for burning wood. Do not burn other fuels.
Installation or service of the Merrimack Large 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.

Save These Instructions for Future Reference

Table of Contents

Specifications.......................................................... 3
Installation............................................................... 4
Operation................................................................. 9
Maintenance.......................................................... 13
Optional Accessories............................................. 16
Replacement Parts................................................ 17
Warranty................................................................ 19

The Merrimack Large Insert is designed,
tested and listed for burning wood. Do notburn other fuels.
The Merrimack Large Insert is not listed formobile home installations.
Failure to follow these instructions may
result in property damage, bodily injury oreven death.

Warning
Proposition 65 Warning: Fuels used in gas, woodburning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known
to the State of California to cause cancer, birth defects and other reproductive harm.
California Health & Safety Code Sec. 25249.6

This stove has not been tested with anunvented gas log set. To reduce the risk offire or injury, do not install an unvented gas
log set into this fireplace.

30004671

Merrimack Large Insert

Specifications
Merrimack Large Insert
EPA Emissions Rating........................................3.6 g/hr
Range of heat output*.............. 10,750 - 31,780 BTU/hr
Maximum heat output**...........................55,000 BTU/hr
Area heated***.................................... up to 2,000 sq. ft.
Size of wood splits........................... up to 22” (560 mm)
Fuel Capacity.......................................... 40 lbs. (18 kg)
Loading...................................................................Front
Flue size..................................................... 6” (150 mm)
Fireplace Insert weight........................ 480 lbs. (218 kg)
Primary Air Control............................................. Manual
Glass panel.......................... High-temperature ceramic
Flue exit position...................................................... Top
Blower rating...............................150 cfm. (115V, 60Hz)
Power Cord Length................... 6 foot useable installed*Under specific test conditions used during EPA emissions standard testing.
**This value can vary depending on how the unit isoperated, and the type and moisture content of the fuelused. The figure shown is based on maximum fuel consumption obtained under laboratory conditions and withaverage efficiencies.
***These values are based on operation in buildingcode conforming homes under typical winter climate
conditions in New England. If your home is of nonstandard construction (e.g. unusually well insulated, not insulated, built under ground, etc.) or if you live in a more
severe or more temperate climate, these figures may
not apply. Since so many variables affect performance,
consult your Vermont Castings’ Authorized Dealer todetermine realistic expectations for your home.

2956 ” (740 mm)
246M” (629 mm)

126QE”(313 mm)

76QE”(183 mm)256 ” (645 mm)

3156O" (800 mm)

17556QE” (449 mm)

266QE”(668 mm)

2356QE”(605 mm)Fig. 1 Merrimack Large Insert dimensions.
4671
Merrimack dims

30004671

Merrimack Large Insert

Installation

Installing the Merrimack Large Insert into an existing
masonry fireplace is an effective way to add an efficientheater to your home. The existing fireplace and chimney must meet certain requirements.

0 To 10'
2' Min.

3'Min.

Requirements for Existing Fireplaces
The Merrimack Large Insert is listed for installation
within a properly built masonry or heat circulating, masonry-type fireplace that is constructed in accordancewith the requirements of recognized building codes. A
heat-circulating masonry-type fireplace must conformto building code standards for masonry fireplaces, andmust consist of a factory-built metal firebox with air
circulation pathways that are surrounded by masonrymaterials. Air circulation pathways must not be blocked
by the insert or surround panels.
The fireplace and chimney must be clean and structurally sound. Have them inspected by a qualified professional chimney sweep, a mason, or your Vermont Castings’ Authorized Dealer before the Merrimack Large
Insert is installed. Any deterioration (cracks, loose
mortar or loose bricks) must be repaired.
Codes may permit removal of the damper in order tomake 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 local 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 mortarthat may jeopardize the compliance of the fireplace withlocal building codes.
The Merrimack Large Insert is not approved for
installation in factory-built fireplaces.

2' Min.

3'
Min.

Reference
Point

Do not connect your Merrimack Large insert to achimney flue serving
AC617 another appliance.
RLTSKC8
2/11/98

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)



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.

• 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 theinsert to clean the chimney flue.

General Considerations / U.S.
• While not required in most jurisdictions in the•

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).

AC617

Fig. 2 The 2’-3’-10’ rule for chimneys.

Requirements for Existing Chimneys
Chimney requirements differ for the U.S. and Canada.
Specifications for each are listed below. Connect theinsert to the chimney in accordance with local codes
and the requirements of the listing agency as specified
in this manual.

0 To 10'•

U.S., MHSC strongly recommends that a fullstainless steel chimney liner be installed for theinsert to the chimney top to increase overall performance and to ease and reduce yearly maintenance.
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 apoured-in-place liner. An unlined chimney must
be relined professionally.
The chimney must have a nominal flue size of6” (152 mm) diameter or 28 square inches (181cm2) but no greater than 3 times larger or 85
square inches (548 cm2). A chimney larger than
this must be re-lined.

30004671

Merrimack Large Insert
Be aware that a chimney originally designed for fireplace use may perform differently when used to vent an
air-controlled appliance such as your Merrimack Large
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 toreduce 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 prefabricated metal chimney section. A positive flue connection consists of a plate that seals or replaces
the fireplace damper and a section of chimney
connector that passes through the plate into thechimney.
• The chimney connector must be a minimum
equivalent to a 6” (152 mm) diameter opening
and must be 24 gauge or heavier stainless steel.
Chimney Connection systems are available from avariety of manufacturers. Your Vermont Castings dealer
can recommend a system that will best meet the requirements 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 withmasonry to the thickness of the chimney wall.
Openings sealed with pie plates or wallpaper area hazard. In the event of a chimney fire, flames
and smoke may be forced from the openings.

• 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 conventional
fireplace. (A Fireplace Modification Tag is included in the hardware bag inside the Merrimack
Large Insert.)

Minimum Fireplace Dimensions
The Merrimack Large Insert will fit many fireplaces. To
confirm that it will fit yours, measure the lintel depth,
plus the height, width, and depth of your fireplace andhearth. Compare them to the measurements in the accompanying 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.
NOTE: The clearance between the Merrimack Large
Insert and the mantel, top trim and side trim cannot be
reduced by installing shields.
Another requirement to consider is the clearance formovable items such as tables, bookcases, rugs, furnishings, and your woodbox. All combustible materials of
this type should be a minimum of 48” (1220 mm) fromthe front surface of the Merrimack Large Insert. Be surethat family members are aware of this requirement as
well, so they too will keep objects a safe distance fromthe stove.

CanadaIn Canada (CAN/CSA-B365-M91, Section 5):• A full chimney liner meeting ULC S635, Class III(stainless steel) must be installed from the insert
to the chimney top, and securely attached toboth. The damper may be removed to accommodate the liner.
• The opening of the fireplace around the insert
must be sealed to prevent room air passing to thefireplace cavity.
• Existing air-circulation chambers in a fireplacewith 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 belocked in the open position.

30004671

Merrimack Large Insert
A
B

D,J

E
B

C

Measureside trim
clearancefrom here

H
D,J

A,I

C

E

X

Fireplace Minimums
A. Width at Face	29C\v” (756 mm)
B. Width at Dimension ‘C’	25”(635 mm)
C. Depth118¹⁄₂” (470 mm)
FP1084
D. Height at Face	23C\v”(603 mm)winterwarm
E. Height at Dimension‘C’	23C\v” (603 mm)
fireplaceminimum
dimensions
Fireplace
Maximums
H. Lintel depth
9”(229 mm)3/01
I. Width245”(1143 mm)
J. Height2
32”(813 mm)

FP1084

1. The minimum depth must be maintained from the floor of the fireplace
to a height of 21¹⁄₂” (540 mm)
2. Though the Merrimack Large Insert will fit into larger fireplaces, thedecorative optional MHSC Surround Panels will not completely cover thefireplace opening if these dimensions are exceeded. Custom made trim
pieces may be used.

Fig. 3 Use these measurements to confirm that the Merrimack
Large 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 withtape the exact center of your fireplace opening on thehearth. Measure the side clearance from this point.
Measure the top trim and/or mantel clearances from thefinished hearth surface. Measure the front clearance (tofurnishings, etc.) from the fireplace face. (Fig. 4)

Hearth Requirements
In some fireplaces, the hearth in front of the fireplace
opening is brick, stone, slate, or some other non-combustible material that is in direct contact with concrete
poured over earth. These are the only hearths that areconsidered noncombustible. In other fireplaces, thebrick or concrete hearth in front of the fireplace opening
is supported by heavy wooden framing. Because neither brick nor concrete has good insulating properties,
heat radiated by the fire will pass downward throughthe hearth to the wooden framing. Such hearths are
considered combustible.

C

FP1085Fireplace ClearancesA. Mantel*
43”(1092 mm)
B. Top Trim (1¹⁄₂”)
41”(1041 mm)
C. Side Trim**	22C\v” (578 mm)* Clearance shown is for 12” (305 mm) deep mantel. Dimension
FP1085may be reduced to 41” (1041 mm) if the mantel is 8” (203 mm)
WinterWarm
deep or less.

clearances** Where side trim extends
more than 1¹⁄₂” (38 mm) from the fire3/01
place facing, the side clearance must be no less than 31Z\v” (794mm); this is also the required side wall clearance.
Measure the side clearance (C) from the exact center of your fireplace 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.

The hearth for the Merrimack insert must be constructed over a completely non-combustible surface (such as
unpainted concrete over earth). This non-combustible
hearth must extend at least 16” (406 mm) in front of thedoors as protection from heat radiated from the insert.
This means the non-combustible hearth must extend
23” in front of the fireplace face opening in a typicalinstallation.
In addition, spark and ember protection is needed 8”(203 mm) to each side of the insert and in Canada,
18” in front of the insert. The approved construction ofthis protection is a minimum or 24 gauge galvanizedsheet metal or equivalent. Figure 5 shows the details ofhearth requirements.

30004671

Merrimack Large Insert
3. If the overall R-value of the system is greater thanthe R-value of the specified floor protector, the alternate is acceptable.
EXAMPLE: The specified floor protector should be 1Z\xinch 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

B

B

7”
(178 mm)A

C

United States	Canada
A. 18”*(460 mm)18”(460 mm)
B. 8”(203FP2492
mm)
8”(203 mm)
C. 46Z\x” (1181mm)protection
46Z\x” (1181 mm)hearthStep a: Use formula above to convert specification to
R-value: R = 1 x T = 1 x 1.5 = 1.79
k
0.84
Step b: Calculate R of proposed system.
4” brick of r = 0.2, therefore:		Rbrick = 0.2 x 4 = 0.8
Step c: 1/8” mineral board of k = 0.29, therefore
		Rmineralboard = 1 x 0.25 = 0.86
0.29
Step d: Rtotal = Rbrick + Rmineralboard = 0.8 + 0.86 = 1.66
Step e: Compare proposed system Rtotal of 1.66 tospecified R of 1.79. Since proposed system Rtotal isless than required, the system is not acceptable.

7/09be djt
In all cases, the hearth mustcompletely noncombustible in frontof the insert to the dimensions shown. The hearth must also be
1Z\x” thick with k-factor of 0.84.
*In the US, if the insert is elevated 2Z\x” (64 mm) or more, no thermal or ember protection is necessary beyond 16” (406 mm).

FP1095

Fig. 5 Unless your fireplace and hearth are constructed overa dirt floor (or unpainted concrete over dirt), you must use afloor protector that satisfies the above requirements.

How to Determine if Alternate Floor
Protection Materials are Acceptable
All floor protection must be noncombustible (i.e. metals, 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 designationsuch as R-value (thermal resistance) or k-factor (thermal conductivity).

Definitions(ft2)(hr)(°F)
Btuk=(Btu)(in)= K x 12(ft2)(hr)(°F)

K = (Btu)(ft)(ft2)(hr)(°F)r=(ft2)(hr)(°F) 1=(Btu)(in)kR=Optional Surround Packages
Custom-made surround panels may be made from any
noncombustible material.
MHSC offers a steel or cast iron surround panel kit.

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: R = 1 x T
kiii. K-factor is given with a required thickness (T) in
inches: R = 1
xT
K x 12
iv. r-factor is given with a required thickness (T) in
inches: R = r x T
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 todetermine overall R-value.
30004671

Merrimack Large Insert
Installing the Merrimack Large 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 position.
~ 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 modified thefireplace in any way to accommodate installation of a
fireplace insert. This tag is in the hardware bag included
with your Insert.
2. Flue collar orientation: The flue collar may be oriented
in the vertical position or rotated 180 degrees on the topof the stove resulting in a 26 degree backward 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 theplanned method for your application, the center iron pull
down handle on the flue collar serves as protection toprevent a chimney brush from damaging the baffle inside
the stove. If cleaning can only take place from inside thehome, the center bar may be cut out of the flue collar using
a hack saw or reciprocating metal cutting saw.
3. Install the venting system: Again, depending on yourapplication it may be easiest to install the connector orstainless steel flue liner in the chimney first. Refer toFigure 6 for the components of the venting system.

•

Carefully remove the fiber baffle by first removing
the front air wash manifold. If necessary, remove the
air tubes to 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 collar as a
guide.
• Secure the flexible pipe to the pipe adaptor using
the same method.
• Install the connector pipe or liner so that the heightmeasured from the finished hearth surface to thecenter bar of the flue collar is 20Z\x” (521 mm). (Fig.
7) This will allow an easy connection once the stoveis rolled into place.
4. Route the blower power cord. Run the power cordout the left or right side of the insert. Remove the two(2) louvre doors (Fig. 9) or access doors. Remove thescrew and washer from each side holding the ashlip
to the front. If you run the power cord out the left side,
remove the two (2) screws holding the rheostat bracket
to the fan housing. Insert grommet nearest fan in the sloton the fan housing, left or right side. Reattach rheostat
bracket with the two (2) screws removed earlier. RemoveFlexible Flue Liner

Flex Liner Adapter(if required)
Adjustable (26” or vertical) Flue Collar w/Integrated Draw-Down Bar
Top of the Insert Around
Flue Opening
Washers 1/4 Dia.
1/4-20 Hex Nuts

ST1002

Fig. 6 Components of the venting system.

MantelRef. 26”

34
6ENT SYSTEM COMPONENTS

AccessDoor
Possible
Handle Bracket
Locations2056O”(521 mm)

ST2493Fig. 7 Measured height from the finished hearth surface tothe center bar of the flue collar.

the cover plate and insert the provided grommet into
the slot. Reattach the cover plate.
ST2493
5. Install Mantel and Access Door.
Removefinished
height the prepack7/09(2) brackets to underaged mantel and install the twoside of mantel using four (4) 1/4-20 Philips head blackscrews as shown in Figure 8. Brackets and screws canbe found in the hardware bag located inside the unit.
Unwrap the two (2) pre-assembled access doors andsnap into place. If the spacing between the doors andupper lattice is not even, you can pull the doors mantel
off and adjust the upper lattice. Screw the two (2) jacking screws that contact the front up or down as needed.
(Fig. 9)6. Install the Optional Surround Kit. Follow the instructions provided with the kit.
7. Roll the Firebox into Position. At least two people will
be needed to move the firebox. To ease installation, lift
the front of the stove slightly to put weight on the rear
wheels. Position the firebox so the flue collar aligns with
30004671

Merrimack Large Insert• Replace the stainless steel air tubes, if removed,

Bracket andScrewsBracket andScrews

ST1163Fig. 8 Secure bracket to mantel with two (2) Philips screws.

the connector. Use the leveling screws at the front of
the Insert to adjust the level. Route the power cord to
ST1163the side nearest thepower supply.
mantel8.	Connect the Fluemerrimack
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 betaken to not disturb the gasket which seals the collar
to the top. Tighten the two 1/4” nuts.

by sliding them first to the right and then into themating holes on the left. Secure these in place withthe stainless steel cotter pins.
• Before installing the airwash manifold, replace thefiber baffle board and ensure it slides all the way
to the back. There should be a tight fit between theboard and the iron sides of the stove.
• Replace the front air tube and secure it in place withthe cotter pin.
9.	Connect the Blower power cord to the power supply. DO NOT ROUTE THE POWER CORD UNDEROR IN FRONT OF THE UNIT.
10.Install the supplied handle storage bracket by simply
sliding the flat end under the right or left side of thestove. (Fig. 7)
This completes installation of your Merrimack Large
Insert.

Operation
Your Insert’s Controls and What They Do

Primary Air Control

All Merrimack Large Insert controls are conveniently located on the front. (Fig. 9)

A single air control regulates the amount of heat the fire
will produce and how long it will burn.

Three controls regulate the performance of your Merrimack
Large Insert:

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.

The primary air control supplies oxygen for the fire.
The variable-speed fan control, or rheostat, regulates
the warm air flow into the room.
An automatic setback control provides a high air settingof restarting or reviving a fire after reloading and closes
automatically once the stove reaches operating temperatures.
Air Control Lever

Space Between
Doors and Upper
LatticeJacking
ScrewsGenerally, more air entering the stove makes the fire burnhotter and faster, while less air prolongs the burn.
The Merrimack Large Insert’s air supply is increased when
the control lever is moved to the left, and decreased when
moved to the right. It may be set anywhere between thetwo extremes, depending on the amount of heat desired.
(Fig. 10)
Air Control
Lever

Open Control Lever to the Left

Jacking
ScrewsClosed Control Lever to the Right

Fan Speed Control (Behind louvre)

Fig. 9 Merrimack Large Insert controls.

30004671

FP2493Merrimack controls

FP2493

ST1157

Fig. 10 The air control lever controls the amount of air entering the firebox.

ST1157
primary air control

Merrimack Large Insert
To complement the manual setting of the air control, theMerrimack Large 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 flowof air into the room. A thermal switch will automatically deactivate the fan when the stove cools down. When startinga fire in a cold stove, this switch will typically energize thefan 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 highburn rates. (Refer to Figure 11 for fan access)This feature is primarily intended for reloading the stove
when lower air settings (low heat output) are desired, but
it is also useful any time the firebox is too cool for proper
combustion or when freshly added wood does not ignite
readily.
For maximum efficiency and performance, the Merrimack
insert should always have visible flames in newly added
wood, either within the fuel pile or near the roof of thefirebox. Wood moisture, piece size, draft, weather andfirebox temperature will all have an effect on how quickly
flaming occurs. The automatic setback air control is aconvenient feature allowing more user flexibility and easeof operation.

Burn Only High-Quality Wood
The Merrimack Large 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” woodthat has not been properly seasoned or cordwood that ismore than two years old.
The best hardwood fuels include oak, maple, beech, ash,and hickory that has been split, stacked, and air-driedoutside under cover for at least one to two years.
For areas that do not have a supply of hardwood, commonly burned softwoods include tamarack, yellow pine,
white pine, Eastern red cedar, fir, and redwood. These
too should be properly dried.
Your Merrimack Large Insert will accept wood up to 22”(559 mm). Longer wood pieces work better than shortones.

Speed Control
Open Bottom Louvre toAccess Fan controls

ST1156

Fig. 11 Fan control access.

Automatic Setback Control
ST1156
The automatic setback air control
is used when starting or
reviving a fire and provides an increased
flowcontrol
of combustion
fan speed
air to the fire until the firebox is sufficiently heated. This
air supply automatically resets to the desired air setting,taking the guesswork out of operating the stove.

Figure 9 shows the automatic setback control. Move theprimary air control lever all the way to the left. Push theprimary control about one more inch to the left to open the
air shutter (the lever will spring back automatically whenreleased). The shutter will remain open only if the stoveis below its proper operating temperature. Once open, theprimary air control lever may be adjusted to any desired
position. Once the stove heats up to its proper operating
temperature, you will here a clicking sound confirming the
shutter has closed. This returns the stove to the output
setting of the primary air control.

10

Wood should be stored under cover to maintain dryness.
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. Settingsfor 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 thechimney. Draft is affected by such things as 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
Merrimack Large 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.

30004671

Merrimack Large Insert
How do you know if your draft is excessively high or low?
Symptoms of too much draft include an uncontrollable
burn or glowing-red cast iron. A sign of inadequate draft issmoke 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 weathertight, poor draft may result from insufficient air in thehouse. In such instances, an open window near the stoveon the windward side of the house will provide the fresh
air needed.
When first using the stove, keep track of the settings ofthe air controls. You will quickly find that a specific setting
will give you a fixed amount of heat. It may take a weekor two to determine the amount of heat and the length ofburn you should expect from various settings.

Follow these guidelines as you start and maintain thefire, and remove the ashes. Prior to starting a fire with acold stove, it is recommended to clear the lower primary
air hole located at the nose of the front brick. To do this,remove the andiron and lift out the front refractory brick.
Sweep any ash accumulation out of the air slot. Keeping
this slot clear of ash will ensure better performance.
1. Open the primary air control fully.
2. Lay several sheets of crumpled newspaper in thebottom. Place on the paper six or eight pieces of dry,finely-split kindling. On the kindling lay two or threelarger sticks of split dry wood approximately 1-2” (2550 mm).

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 ofyour heater by altering the air control adjustment
range outlined in these directions.

Do not use chemicals or fluids to start the fire. Do notburn garbage or flammable fluids such as gasoline,
naptha, or engine oil. Also, never use gasoline-type
lantern fuel, kerosene, charcoal lighter fluid, or similar
liquids to start or “freshen up” a fire in this heater.
Keep all such liquids well away from the heater while
it is in use.

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.

3. Light the newspaper and close the door. Graduallybuild up the fire by adding a few 3-5” (76 -127 mm)diameter splits.

Merrimack Large Insert Control Settings

If this is your initial break-in fire, let the fire burn brightly,
but not to excess. Control the fire’s intensity by adjusting
the air control lever. After an hour or so stop adding wood
so that the fire dies out gradually.

	Primary Air	Air Circulation
	Burn	Control
Rate
Setting

Fan	Control
Speed	Position

High

Fully left

High

Horizontal

Medium		1” from
full right

Low

Turn clockwise

Low

Fully rightOff

Turn counterclockwise

Starting and Maintaining a Wood Fire
Burn solid wood fuel only in the Merrimack Large Insert, and burn it directly on the grate. Do not elevate
the fuel. Do not burn coal or other fuels.
Cast iron is a superior material for solid fuel stoves but
it must be treated with respect. It is extremely strong,but can be broken with a sharp blow from a hammer orfrom the thermal shock of rapid and extreme temperaturechanges. It is important to temper the cast iron plates withan initial series of 3-4 break-in fires. The plates expand
and contract with changes in temperature. Minimize
thermal stress by allowing the plates to adjust graduallyduring the break-in fires by following Steps 1-3 on thefollowing page.
WARNING: Operate your Merrimack Large Insert onlywith the door fully closed. If the door is left partiallyopen, gas and flame may be drawn out of the fireplace
opening, creating risks of both fire and smoke.

30004671

For ongoing operation after the initial break-in, continue
to add a few sticks at a time of a progressively larger size.
Be sure to keep the fuel load behind the front grate bar
at all times. Continue until you have a live ember bed atleast 3-4” (76 - 102 mm) deep. This may take an hour or
longer, particularly when the Merrimack Large Insert isvented to an exterior masonry chimney or when you are
just starting a fire.
You’ll soon find that the insert is HOT WHILE IN OPERATION! KEEP CHILDREN, CLOTHING, AND FURNITURE
AWAY. CONTACT MAY CAUSE SKIN BURNS.
NOTE: Some chimneys need to be “primed,” or warmed
up, before they will draw sufficiently to start a fire. To correct this situation, roll up a couple pieces of newspaper,
place them on top of the kindling and toward the back of
the stove, light them, and close the doors. This shouldheat the chimney enough to initiate a draft.
Once the draft is established, open the front door and lightthe rest of the fuel from the bottom. Do not light the main
bed of fuel until the chimney begins drawing, and repeat
the procedure as often as necessary if the initial attempt
is unsuccessful.

11

Merrimack Large Insert
4. Once a good ember bed of at least 3-4” (76 - 102 mm)
has formed, add the desired amount of wood and close
the primary air control to a medium-low setting. The firevolume will diminish immediately, but the Merrimack
Large Insert will continue to heat up. Maintain controlof the fire using the primary air control, and remember:
reduce the setting for less heat, increase the setting
for more heat. Refer to the air control settings chart
on Page 10 for recommended settings at different burnrates.
Do not over-fire this heater.
Overfiring may cause a house fire, or can result in permanent damage to the stove. If an exterior part of the
Merrimack Large Insert glows, you are overfiring.

Reloading and Reviving a Wood Fire
Set the air control on “High,” and wait at least fifteen seconds for the draft to increase. Turn the convection blower
off. Open the doors slowly.
IMPORTANT: While the stove is hot, toss and sift thecoals with each stove loading. This loosens and helps
burn coals that become buried in the ash. Push coals
away from the bottom air jet. Creating this “void” helps
maintain a reliable fire.
Check the ash level, and remove excess ash. A primary
air hole located under the front brick provides air to thecoal bed. (Fig. 12) This hole should be cleared of ash forproper performance.
Primary Air
Hole

bed is less than 2-3” (51 - 76 mm), activate the automatic
setback feature. This will provide extra air to start the fire
flaming and ‘setback’ to the desired air setting once thestove is heated.
Finally, adjust the air control and fan speed for your desired heat level.
NOTE: If the charcoal bed is relatively thick and your fuelis well-seasoned, it is possible to add fresh fuel (smaller
pieces first), close the door, and reset the air control immediately.

Special Tactics for Cold-Climate Heating
The Merrimack Large Insert is capable of producing up to
55,000 Btu/hour and heating an area of up to 2,000 sq. ft.
However, many factors affect heating performance andcan influence the extent to which the Merrimack Large
Insert can heat a given area.
A well-insulated home, located in a moderate climate andwith the Merrimack Large Insert located centrally in an
open floor plan, will be easier to heat than a drafty home in
the far north in which a Merrimack Large Insert is installedon an exterior wall at the end of a long house.
In Fireplace Insert installations, over-sized chimneys can
produce less effective results than those that are properly
sized, and interior chimneys usually perform better thanthose located outside the house.
Different results may be experienced even in the same
installation if you switch from burning good, dry wood towood that is partially rotted or inadequately seasoned.
To compensate for these factors in cold climates, it may
be necessary to operate the Merrimack Large Insert for
longer periods of time with the air control set to a higher
level more of the time.

Remove and Store Ash Safely
Check the ash level before reloading the stove, remove
ashes if necessary. Turn off the fan before shoveling theash into your ash container.

ST1158AndironFig. 12 Keep primary air holes free of ash for proper performance.

Add the fuel, smallerST1158
pieces first. If it is necessary to usewood smaller than the 18” (460 mm) optimum size, befront bricks
sure to fill the firebox as completely as possible by loading the wood pieces alternately on the left and right. Split
wood will fill the firebox more completely and reduce thefrequency of reloading. If possible, stack wood diagonallyto maximize air spaces between fired pieces.
If you have an ember bed of at least 2-3” (51 - 76 mm),the air setting may not need to be adjusted. If the ember
12

Remove ash regularly, typically every one to three days.
The frequency will vary depending on how you operate yourMerrimack Large Insert; more wood is consumed at higher
heat output settings, and ash will accumulate faster.
Ash should be removed frequently and placed outdoors in a
metal container with a tight-fitting lid. The closed containerof ash should be placed on a non-combustible floor or on
the ground, well away from all combustible materials, pending final disposal. If the ash is disposed of by burial in soil
or otherwise locally dispersed, it should be retained in theclosed container until all cinders have thoroughly cooled.
Wood ash may be used as a garden fertilizer.
CAUTION: Never use your household or shop vacuum
cleaner to remove ash from the fireplace; always remove
and dispose of the ash properly.
30004671

Merrimack Large Insert

Maintenance
Keep Your Merrimack Large Insert
Looking New and Working Its Best
Care of the Cast Iron Surface
An occasional dusting with a dry rag will keep the
painted cast iron of your Merrimack Large Insert looking
new.
If the paint needs retouching, first allow the surface tocool completely. Mask glass, trim parts and enamelledareas. Wire-brush those areas to be painted. Touch-up
with high temperature stove paint available from yourlocal dealer. Apply the paint sparingly. Two light coats
are better than one heavy one.

Care of the Porcelain Enamel Surface
Use a soft brush as necessary. Do not use water orother liquids on your Merrimack Large Insert. Fingerprints usually can be buffed off porcelain enamel witha dry, soft cloth. If marks remain, allow the Merrimack
Large Insert to cool completely, then buff with a slightly
damp, soft cloth. Dry completely before starting a fire to
avoid streaking.
Never use abrasives or harsh chemical cleaners on
the porcelain enamel finish; the enamel may scratchand expose the cast iron, which can then stain or
rust. If you must remove spills or stains from porcelainsurfaces, make sure the fire is out and the Merrimack
Large Insert has cooled completely before cleaning.
Use a kitchen appliance cleaner and/or polish specifically formulated for enamel surfaces. Apply the cleaner
sparingly with a soft cloth, and buff away all traces.

Cleaning the Glass
The Merrimack Large Insert glass system requires aminimum amount of cleaning. Most carbon deposits
that accumulate will burn off during hot fires.
Ash residue that accumulates on the glass should be
removed periodically to prevent etching. To clean theglass, use the following procedure.

• Be sure the glass is completely cool.
• Cleaning with water will work in most cases. Use••a glass cleaner especially made for this purpose
only if deposits are specially heavy. (If heavy
deposits are a frequent occurrence, however,
evaluate your operating techniques.) Do not use
abrasive cleaners.
Rinse the glass thoroughly.
Dry the glass completely.

30004671

Adjust the Door Latch Periodically
The front door of the Merrimack Large Insert shouldclose securely to prevent accidental opening andshould close tightly to prevent air from leaking into thefire chamber. The door handle will be positioned vertically when the door is closed.
Over a period of time, the gasket around the door willcompress and the latch may need adjustment. To adjust the handle, follow this procedure:
1. Remove and retain the lock nut with a 9/16” wrench.
(Fig. 13)
2. Loosen the set screw with a 1/8” Allen wrench.
3. Rotate the pawl 180°. Replace the lock nut. Tighten
the set screw.
4. Additional adjustment can be made by removing theflat washer. Or any combination of washer removal
and/or pawl rotation.
RollerShoulder Screw

Lock Nut
Set Screw
Flat Washer

Handle Stub

ST1154

Fig. 13 Rotate pawl and/or remove flat washer to adjust
latch.

Test the door seal. Close the door on a dollar bill andattempt to pull it free.ST1154
If the bill is freed with little repawlenough at that spot.
sistance, the gasket door
isn’t snug
Continue to make small adjustments until the setting isright.
If additional adjusting of the latch does not enable thedoor to seal sufficiently in one area, try “adjusting” thegasket in that area. Pack more cement or a smaller
diameter gasket into the channel beneath the gasket so
the main gasket is raised and makes contact with thedoor frame. If this procedure doesn’t solve the problem,
replace the gasket. Instructions for gasket replacement
are given later in this section.

13

Merrimack Large Insert• Examine the gasket that seals the glass to the door

IMPORTANT NOTESHOT GLASS WILLCAUSE BURNS.

frame. If necessary, replace this with gasket obtained from your local Vermont Castings’ authorized
dealer. Directions for replacing gaskets are given
below.
Check the channel at the bottom of the door frame,and clear away debris if necessary.
Carefully place the new glass in the door frame.
Secure the clips, being careful not to over-tighten.
Be sure the glass is firmly seated against the gasket.
Close the door gently to confirm the clips have been
properly positioned. It is possible for the glass to bedamaged if the clips have been installed incorrectly
and the door is closed with force.

DO NOT TOUCH GLASSUNTIL COOLED.

How to Replace Gaskets• Do not operate the Merrimack Large Insert if the••glass is damaged or broken.
Do not abuse glass by striking with any object orby slamming the door.
Replace glass only with MHSC high temperature ceramic glass, available from your Vermont
Castings’ authorized dealer.

•••! WARNING

NEVER ALLOW CHILDRENTO TOUCH GLASS.

Removing and Replacing Door Glass
Follow this procedure to replace glass.

• Open the door and loosen the four retaining clip!

AVERTISSEMENT

screws that hold the glass to the door. Swing theclips out of the way. Tilt the glass away from the door
vitré andchaud
frame and lift up. (Fig.Un
14)panneau
Wear gloves
usepeut
caucauserdesbrûlures.
tion when handling broken glass.
Laissez refroidir le panneau
vitré avant d’y toucher.
Ne laisser jamais les enfants
toucher le panneau vitré.

Your Merrimack Large Insert uses rope-type fiberglass
gaskets to make a tight seal between some parts. Withuse, particularly on those parts that move, gaskets canbecome brittle and compressed and can begin to lose
their effectiveness. These will need periodic replacement.
All of the gaskets used are made of fiberglass. The
three sizes of replaceable gasket are listed below, alongwith their application.
Replaceable Merrimack Large Insert
Fiberglass Gaskets
Gasket Size....................And The Parts It Seals
3/8” (1203564)................Door to the front - 5.6’
3/8” (30002422)..............Firebox parts
3/16” (1203556)..............Glass to the door - 5.2’
To change a gasket, wait until the fire is out and thestove has cooled. Wear protective eyewear and a dust
mask. The procedure is the same for all gaskets.
1. Remove the existing fiberglass gasket by graspingan end and pulling firmly.
2. Use a wire brush or the tip of a screwdriver to clean
the channel of any remaining cement, silicone or bitsof gasket.
3. Apply a thin bead of high temperature silicone to the
newly-cleaned groove. A 1/8” - 3/16” bead is sufficient.
4. Place a new gasket into the groove. Wait until you
have placed all but a couple inches from the end
before you trim the end to an exact fit.

Retainer
Clips

Fig. 14 Replace glass.

Door
GasketGlass
GasketGlass Panel
ST11551430004671

ST1155
replace glassMerrimack Large Insert
Replacing the Door Gaskets• Remove the door by lifting it straight up from its
•
•
•
•
•

hinge pins.
Lay it face down on a padded surface.
Remove the glass. Follow the instructions for removing and replacing glass which start on Page
14.
Replace gaskets. Follow steps 1-4, above.
Replace the glass.
Replace the door.

The Chimney System
A Clean Chimney System is Saferand Works Better
Although the non-catalytic combustion system in yourMerrimack Large Insert can reduce creosote formation
dramatically, it is not a substitute for regular inspection
and cleaning of the chimney and chimney connector.

Learn to Recognize —And Avoid — Creosote

light, sight up through the flue collar into the chimney
flue. The fiber baffle will need to be removed gently toview inside the connector pipe.
If it is necessary to remove the firechamber to inspect
or clean the chimney, this is how to do it:• Let the Merrimack Large Insert cool.
• Disconnect the fan power cord.
• You may wish to lighten the firebox by removing
the load door and andiron.

• Retract the two levelling screws until they bear noweight.
• Remove the front air tube and fiber baffle.
• Disconnect the flue collar or vent connector fromthe top of the stove.
• Slide the firechamber forward until you have access to the fireplace opening.
• Inspect the flue.
You can now inspect the smoke shelf area of the fireplace and the chimney. Before replacing the Merrimack
Large Insert, this area should be inspected for signs ofdeterioration and cleaned thoroughly with a chimney
brush.

Your Merrimack Large Insert has been designed tominimize creosote build-up. Regular chimney inspection
and maintenance, however, must still be performed.
For safety, good stove performance, and to protect yourchimney and chimney connector, inspect your chimney
and chimney connector on a regular schedule. Clean
the system if necessary. Failure to keep the chimney
and connector system clean can result in a serious
chimney fire.

Clean the chimney using a specially designed brush thesame size and shape as the flue liner. Flexible fiberglass rods are used to run the brush up and down theliner, causing any deposits to fall to the bottom of thechimney where they can be removed through the cleanout door.

When wood is burned slowly, it produces tar, organic
vapors and moisture which combine to form creosote.
The creosote vapors condense in the relatively coolchimney flue of a slow-burning fire. As a result, creosote residue accumulates on the flue lining. Whenignited, this creosote makes an extremely hot fire within
the flue system that can damage the chimney andoverheat adjacent combustible material. If a significant
layer of creosote has accumulated —1/8” (3 mm) or
more — it should be removed to reduce the risk of achimney fire.

Reinstall the connector sections after cleaning, being
sure to secure the individual sections with sheet metalscrews.

If you do experience a chimney fire, act promptly to:• Close the primary air control lever (fully to theright).

• Get everyone out of the house.
• Call the Fire Department from a nearby house.
You should inspect the system every two months during
the heating season as part of a regular maintenanceschedule. To inspect the chimney, let the Merrimack
Large Insert cool completely. Then, using a strong
30004671

The chimney connector should be cleaned by disconnecting the sections, taking them outside, and removing
any deposits with a stiff wire brush.

If you can’t do the chimney inspection yourself, contact your local Vermont Castings’ Authorized Dealer, or
engage a professional chimney sweep to perform theinspection and cleaning of the chimney.
Reverse the procedure to re-install the firechamber.

Fireplace System Maintenance Schedule
Fireplace:
Daily:• Ash should be removed before the level reaches•

the top edge of the front brick. Check each time
you re-load, or at least once a day.
Keep the area around the fireplace clear of any
combustible material.

15Merrimack Large Insert
Yearly Spring Cleaning:• Remove ash from the firebox and replace with amoisture-absorbing material (such as kitty litter)to keep the interior of the stove dry.
Touch up painted surfaces with black paint.

•

Flex Connection:
Two Months:

For parts and information about your insert, contact
your Vermont Castings authorized dealer. For the nameof the dealer nearest you, contact:
MHSC
149 Cleveland Drive
Paris, KY 40361
800-668-5323• Inspect the chimney and flue connection. Clean
the system if necessary.

Yearly Spring Cleaning:• Disassemble the flue connection and take it

outdoors for inspection and cleaning. Replace
weak sections of connector.
Inspect the chimney for signs of deterioration.
Repairs to a masonry chimney should be madeby a professional mason. Replace damaged
sections of prefabricated chimney. Your local
Vermont Castings’ dealer or a chimney sweep
can help determine when replacement isnecessary.
Thoroughly clean the chimney.

••

In the event of component failure, it is very important toreplace with equipment equivalent to the Vermont Castings original parts.

Optional Accessories
Northfield Cast Iron Surround
Model	ColorNORCSCBClassic BlackNORCSEB
Ebony
Exeter Steel Surround,
Model	Color
EXSSCBClassic black
45(6 ” (1165 mm)

4656QE" (1170 mm)

326:O”(817 mm)326QE”(818 mm)Exeter Steel Surround

Northfield Cast Iron Surround

ST1161
Exeter surround16

30004671

ST1160Merrimack Large Insert

65
44

43

12

64

66

52
50

22
24
73

28
23

19

40
17

3

5

38

37

53 47

70

53

46

48

42

15
49

60 57

55

59 54

29
6
30

10
4

71

25
32
67
21

14

2

26

27
54
13

1

16
34 74

18
36

41
33
28

20

35

68

9

60 57

11

58

8

61
62

63

56
59

31

69

74

27

72

39

54
58

7

MHSC reserves the right to make changes in design, materials, specifications, prices and discontinue colors and products at any time, without
notice.

4671
Merrimack parts

Merrimack Large Insert
Ref. Description	Part Number
1. Bottom
30004620
	2. Back
30004621
3. End, Right
30004622
4. End, Left
30004623
5. Top
30004624
6. Front
30004625
7. Door, Left
Refer to Enamel Chart
8. Door, Right
Refer to Enamel Chart
9. Base Plate
30004628
10. Air Manifold
30004629
11. Door, Access
Refer to Enamel Chart
12. Cover Plate, Top
30004631
13. Andiron
30004635
14. Ashlip
Refer to Enamel Chart
15. Lattice Front, Top
Refer to Enamel Chart
16. Lattice Front, Bottom
Refer to Enamel Chart
30004671

Ref. Description	Part Number
17. Mantel
Refer to Enamel Chart
18. Air Cover Plate
30004640
19. Collar, Flue
30004317	20. Fan Kit Assy
30004669
	20a. Replacement Blower Only
30004412
	20b. Snapstat Wire Assy.
30004406
	20c. Rheostat and Wire Assy.
30004407
	20d. Power Cord
1601482	20e. Snapstat
30005236	20f. D Knob1604419
	21. Side Panel, Left
Refer to Enamel Chart
	22. Side Panel, Right
Refer to Enamel Chart
	23. Airplate
30004315	24. Pinion
30004320	25. Wheel
30004319	26. Shaft,Wheel
30004318
17

Merrimack Large Insert

Merrimack Large Insert (continued)
Ref. Description	Part Number
	27. Insulation, Int. End
30004649
	28. Insulation, Ext. End
30004648	29. Brick, Back
30004641
30. Brick, Right End
30004645
31. Brick, Left End
30004646
32. Brick, Bottom Low
30004642
33. Brick, Bottom Slnt
30004643
34. Brick, Bottom Upper Right
30004644
35. Brick, Bottom Upper Left
30004955
36. Brick, Bottom Center
30004956
37. Tube A, Secondairy Air
30004377
38. Baffle
30004647
39. Bottom Assy
30004662
40. Right Side Shld, 2nd Air
30004396
41. Left Side Shld, 2nd Air
30004404
42. Shroud, Outer
30004665
43. Top Shroud
30004660
44. Flange, Flue Collar Surround30004675
45. Cover, Power Cord
30004379
46. Automatic Air Setback Assy
30004999
47. Bracket, Mantel
30004679
48. Front Hinge, TR/BL
30004945
49. Front Hinge, TL/BR
30004950
50. Disk
30005050
51. Throttle Lever
30005051
52. Spring
30005052
53. Bracket, Upper Lattice30004676
54. Bracket, Door Hinge
30004947

Ref. Description	Part Number
55. Glass, Right (IR coated)
30004654
56. Glass, Left (IR coated)
30004655
57. Glass Clip
30004957
58. Gasket Fiberglass 3/8 low D 6nd1203589
59. Gasket Fiberglass 3/16 4nd Blk
1203556
60. Trs Hd PH 10-24 x 1/2-Z
1200998
61. Front Steel Hdl/Shaft-BNI-VER
30002717
62. Nut Hex Jam 3/8-16 TOPLK-Z
1203290
63. Pawl Assy Roller
30005157
64. Handle Damper, Maple wood blk
1600664
65. Pan Hd SL 1/4-20x3-Z
120131066. Insert Lifter Handle -NI
1600650
67. Fallaway Handle Bracket
30005048
68. Nut Acorn 1/4-20-Z
1203118
69. Ss soc 1/4-20x1 1/4 Cup Pt-SS
120041470. Cotter Pin, 1/8”x1Z\v” L-SS
30004405
71. Insulation, Bottom
30004650
72. Insulation, BHS
30004402
73. Friction Spring
1201846
74. Bracket, Access Door
30004949
75. Bushing (bottom door hinge brckt)
30005225

Shell Enamel Parts - Merrimack Large Insert
	Part Name	Classic Black	Ebony
Door Left
30004626
30005193
Door Right
30004627
30005194
Door, Access
30004630
30005195
Ashlip
30004636
30005196
Lattice, Front, Top
30004637
30005197
Lattice, Front, Bottom
30004638
30005198
Mantel30004639
30005199
Side Panel, Left
30004634
30005200
Side Panel, Right
30004673
3000520118

30004671

Merrimack Large Insert
LIMITED LIFETIME Warranty
For Vermont Castings Merrimack, Non-Catalytic Large Insert
Limited Lifetime Warranty
MHSC warrants that all refractory brick and material used in this product will be warranted against
deterioration not resulting from physical damage oroverloading of the woodstove for the lifetime of thisproduct. This coverage includes the components ofthe EverBurn System: “shoe, fountain, and fireback.
Coverage is provided only to the original purchaser.

Limited 3 Year Warranty

All cast iron parts are warranted for a period of three
years against breakage, cracking or burn-through.

Limited 1 Year Warranty

The following part of the woodburning stove are warranted to be free of defects in material and workmanshipfor a period of one year from the date you receive it: The
handles, glass door panels, door gasketing and porcelain
finish. Any of these items found to be defective will be
repaired or replaced at no charge, upon the return of thepart with postage prepaid to a Vermont Castings Authorized Dealer.
Any parts repaired or replaced during the limited warranty
period will be warranted under the terms of the limited
warranty for a period not to exceed the remaining term of
the original limited warranty or six (6) months, whicheveris longer.

Exclusions & Limitations

1. This warranty is non-transferable.
2. This warranty does not cover misuse of the stove.
Misuse includes overfiring, which will result if the stoveis used in such a manner as to cause one or moreof the plates to glow red. Overfiring can be identified
later by warped plates and areas where the paint pigments has burned off. Overfiring in enamel stoves is
identified by bubbling, cracking, chipping and discoloration of the porcelain enamel finish. MHSC offers nowarranty on chipping of enamel surfaces. Inspect yourwoodburning stove prior to accepting it for any damage to the enamel.
3. This warranty does not cover misuse of the stove as
described in the Owners Guide, nor does it cover astove which has been modified unless authorized by
a MHSC representative in writing. This warranty does
not cover damage to the stove caused by burning salt
saturated wood, chemically treated wood, or any fuelnot recommended in the Owners Guide.
4. This warranty does not cover a stove repaired bysomeone other than a Vermont Castings Authorized
Dealer.

30004671

5. Damage to the unit while in transit is not coveredby this warranty but is subject to a claim against thecommon carrier. Contact Vermont Castings Authorized Dealer from whom you purchased your stove or
MHSC if the purchase was direct. (Do not operate
the stove as this may negate the ability to process theclaim with the carrier).
6. Claims are not valid where the installation does notconform to local building and fire codes or, in their absence, to the recommendations in our Owners Guide.
7. The salt air environment of coastal areas, or a highhumidity environment, can be corrosive to the porcelain enamel finish. These conditions can cause rustingof the cast iron beneath the porcelain enamel finish,
which will cause the porcelain enamel finish to flake
off. This warranty does not cover damage caused bya salt air or high-humidity environment.
8. MHSC shall have no obligation to enhance or update
any unit once manufactured.
IN NO EVENT SHALL MHSC BE LIABLE FOR INCIDENTAL
AND CONSEQUENTIAL DAMAGES. ALL IMPLIED WARRANTIES, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS, ARE LIMITED TO THE
DURATION OF THIS WRITTEN WARRANTY. THIS WARRANTY SUPERCEDES ALL OTHER ORAL OR WRITTENWARRANTIES.

Some states do not allow the exclusion or limitations ofincidental and consequential damages or limitations on
how long an implied warranty lasts, so the above limitations may not apply to you. This warranty gives you
specific rights and you may have other rights, which varyfrom state to state.

How to Obtain Service

If a defect is noted within the warranty period, the customer should contact a Vermont Castings Authorized
Dealer or MHSC if the purchase was direct with the following information:
1. Name, address, and telephone number of the purchaser
2. Date of Purchase.
3. Serial number from the label on the back4. Nature of the defect or damage.
5. Any relevant information or circumstances, e.g., installation, mode of operation when defect was noted.
A warranty claim will then start in process. MHSC reserves the right to withhold final approval of a warranty
claim pending a visual inspection of the defect by authorized representatives.

19

MHSC

149 Cleveland Drive • Paris, Kentucky 40361
www.mhsc.com