Vermont Castings Merrimack Homeowner's Installation And Operating Manual page 7

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 alternate
is acceptable.
eXaMpLe: The specified floor protector should be 1¹\₂-
inch thick material with k-factor of 0.84. The proposed al-
ternate 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
1
R-value:
R = x T =
k
Step b: Calculate R of proposed system.
4" brick of r = 0.2, therefore:
R = 0.2 x 4 = 0.8
brick
Step c: 1/8" mineral board of k = 0.29, therefore
1
R = x 0.25 = 0.86
0.29
mineralboard
Step d: R = R + R
total brick mineralboard
Step e: Compare proposed system Rtotal of 1.66 to
specified R of 1.79. Since proposed system Rtotal is
less than required, the system is not acceptable.
Definitions
(ft )(hr)(°F)
2
R =
Btu
(Btu)(ft)
K =
(ft )(hr)(°F)
2
optional Surround packages
Custom-made surround panels may be made from any
noncombustible material.
MHSC offers a steel or cast iron surround panel kit.
Installing the Merrimack Large Insert
1. Remove or Disable the Fireplace Damper. If codes al-
low, 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 the
fireplace in any way to accommodate installation of a
fireplace insert. This tag is in the hardware bag included
with your Insert.
30004671
1
x 1.5 = 1.79
0.84
= 0.8 + 0.86 = 1.66
(Btu)(in)
k = = K x 12
(ft )(hr)(°F)
2
(ft )(hr)(°F)
2
1
r = =
(Btu)(in)
k
1/4-20 Hex Nuts
Fig. 6 Components of the venting system.
2. Flue collar orientation: The flue collar may be oriented
in the vertical position or rotated 180 degrees on the top
of 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 the
planned method for your application, the center iron pull
down handle on the flue collar serves as protection to
prevent a chimney brush from damaging 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.
3. Install the venting system: Again, depending on your
application it may be easiest to install the connector 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 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 height
measured from the finished hearth surface to the
center bar of the flue collar is 20¹\₂" (521 mm). (Fig.
7) This will allow an easy connection once the stove
is rolled into place.
4. Route the blower power cord. Run the power cord
out the left or right side of the insert. Remove the two
(2) louvre doors (Fig. 9) or access doors. Remove the
screw and washer from each side holding the ashlip
Merrimack Large Insert
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.
ST1002
7