Trueheat TH36 - Hearth, Finishing, and Optional Features; Hearth Extension Requirements

Hearth Extensions:
When a TRUEHEAT® Fireplace is installed on a combustible
floor, then a hearth extension constructed of 4 sheets of Va" thick
Johns-Manville Cera Form 106R Board or listed floor protector.
If Cera-Form Board is used, it must be protected with a minimum of 26
gage galvanized steel and may be covered with a non-combustible veneer,
such as stone, brick, tile, etc.
The appropriate size for the hearth extensions for the TH28, TH36, and
TH42 models are given in Table 4 and are shown in Fig. 8.
TABLE 4
MODEL A B
C
TH28
16
44 8
TH36
20
60
12
TH42
20
66
12
WARNING: THE CRACK BETWEEN THE BACK
OF THE HEARTH EXTENSION AND THE FRONT
OF THE FIREPLACE MUST BE SEALED WITH A
NON-COMBUSTIBLE MATERIAL SUCH AS
GROUT, MORTAR, ETC. ALSO PROVIDED WITH
YOUR FIREPLACE ARE TWO METAL SAFETY
STRIPS THAT MUST BE INSTALLED IN THE
CRACK BETWEEN THE FIREPLACE AND THE
HEARTH EXTENSION. THE SAFETY STRIP
SHOULD BE OVERLAPPED TO FORM ONE LONG
PIECE AND SHOULD BE LOCATED HALF UNDER
THE FIREPLACE, HALF UNDER THE HEARTH EX
TENSION. THIS SAFETY STRIP IS VERY IMPOR
TANT BECAUSE IT KEEPS ANY HOT EMBERS
THAT MAY FALL INTO THE CRACK FROM COM
ING INTO CONTACT WITH THE COMBUSTIBLE
FLOOR. SEE FIG. 9.
GAS APPLIANCE ACCESSORIES
If you intend to add a gas appliance accessory
to your fireplace you must install the gas line into
the fireplace when you install the fireplace. The gas
line should be constructed of % in. iron pipe and
the appropriate iron fittings. The gas line can enter
the fireplace from either side. With a screwdriver
and hammer, remove the knockout from the outside
wall of the fireplace. If the fireplace is equipped
with metal side panels in the firebox then remove
the knockout in the side panel the same way. If the
fireplace has refractory side panels, then chisel a
hole
as shown in FIG. 10. After removing the
knockout in the refractory or metal side panel,
remove one last knockout in the fire chamber
sidewalls. Next, install gas line through the knock
outs into the firechamber of the fireplace. A
minimum 7 in long nipple should be used to reach
the inside of the fireplace. Either cap off or install
gas log or lighter and check for leaks.
The gas line provision is intended to be con
nected to a decorative gas appliance only, in accor
dance with the National Fuel Gas Code, ANSI Z
223.1 - 1980.
FIQ.8
HEARTH EXTENSION SIZES
FOR TRUEHEAT* FIREPLACES
SEAL THIS GAP WITH NON-COMBUSTIBLE
MATERIAL, SUCH AS GROUT OR MORTAR
FRONT BASE OF FIREPLACE
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HEARTH EXTENSION
METAL SAFETY STRIP
FIQ.9
INSTALLING THE FIREPLACE SAFETY STRIP
FIG. 10
REMOVING KNOCKOUT IN REFRACTORY SIDE PANELS
CHISEL OR
SCREWDRIVER
\\
I
REFRACTORY
SIDE
PANEL
REFRACTORY
SIDE
PANEL
A. CHISEL OFF NIPPLE
B. CHISEL HOLE TO DESIRED SIZE
Page 7
WARNINO: IF YOU ATTEMPT TO CHISEL
STRAIGHT THROUQH THE REFRACTORY SIDE
PANEL BEFORE REMOVINO THE NIPPLE YOU
MAY CRACK AND BREAK THE PANEL. NEVER
OPERATE FIREPLACE IF REFRACTORY SIOE
PANELS ARE NOT INSTALLED.