24
Jøtul C
550
CB Rockland 139656 5/15/15
All hearth protection materials must be noncombustible; i.e:
metal, brick, stone, or mineral fiber boards. Any combustible
material may not be used.
Follow the procedures below to determine if a proposed
alternate floor material meets requirements listed in this
manual.
R-value = thermal resistance
k-value = thermal conductivity
C-value = thermal conductance
1. Convert the specification to R-value:
a.
If r-value is given, no conversion is needed.
b.
If k-value is given with a required thickness (T)
in inches: R= 1/k x T.
c.
If C-value is given: R= 1/C.
2. Determine the R-value of the proposed alternate floor
protector.
a.
Use the formula in Step 1 to convert values
not expressed as “R”.
b.
For multiple layers, add R-values of each layer
to determine overall R-value.
c.
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 3/4” thick material
with a k-factor of 0.84. The proposed alternate is 4” brick
with a C-factor of 1.25 over 1/8” mineral board with a k-
factor of 0.29.
Step 1. Use the formula above to convert specifications to
R-value. R = 1 x T = 1/.84 x .75 = .893
Step 2. Calculate R of proposed system.
• 4” brick of C = 1.25, therefore
• R brick = 1/C = 1/1.25 = 0.80
• 1/8” mineral board of k = 0.29, therefore
• R mineral board = 1/.29 x 0.125 = 0.431
Total R = R brick + R mineral board = 0.8 + 0.431 = 1.231
Step 3. Compare proposed system R = 1.231 to specified R
of 0.893. Since R is greater than required, the system is
acceptable.
Definitions:
Thermal conductance =
C = Btu = W
(hr)(ft2)(F) (m2)(K)
Thermal conductivity =
k = Btu = W = (Btu)
(hr)(ft2)(F) (m2)(K) (hr)(ft)(F)
Thermal resistance =
R =
(ft2)(hr(F) = (m2)(K)
Btu W
Appendix A
Alternate Hearth Protection
Leg Leveler Installation
Two leg leveler bolts are contained within the
Miscellaneous Kit included inside the firebox. The bolts
are intended to help level and plumb the firebox if
irregularities exist between the front and rear of the
fireplace hearth.
Examine the hearth floor to determine any
difference in height between the front and rear or side
to side. Slide the firebox into the fireplace to confirm
whether or not the leveler bolts will be necessary.
If appropriate, install the bolts through the tapped
holes located in the firebox floor approximately 6” from
the rear of the firebox. Adjust as necessary to achieve
correct lateral level and vertical plumb.
Figure 22. Surround
assembly is out
of plumb because
firebox is not level.
Figure 23.
Install leveler bolts
to level the firebox
and achieve correct
surround assembly
alignment.
Leveler
Bolt
Door Knob Installation
The Door Knob components are included in a separate bag
contained within the Miscellaneous Kit included with the
firebox. Install the parts in the order shown in fig. 22. Phillips
screwdriver required.
Figure 24. Door knob assembly.
Washer
Insulated Washer
Knob Sleeve M6 x 40 Phillips
Head Bolt
M6 hex nut
Wooden Knob
Door Handle
