13
Preparation
Existing Fireplace
Existing Fireplace Preparation
A few points must be considered before inserting
the 738 into an existing fi replace cavity. Generally, no
modifi cations are allowed to the existing fi replace that
will compromise the integrity of the existing fi replace.
Components that are bolted or screwed on such as
dampers or baffl es may be removed to accommodate
the installation of the 738 engine. Cutting away any
sheet metal parts of the existing fi replace to accommo-
date the installation of the 738 is prohibited. Check with
local authorities if in doubt.
Clean Fireplace and Chimney
Have the chimney swept and the fi replace cavity
including ash dumps and clean-outs cleaned before
installing the 738 heater and vent liners. Any creosote
or soot residue remaining in the fi replace cavity chim-
ney or clean-out may cause odors or stains once the
738 insert is installed. Consult with chimney sweep for
information on how best to clean.
Existing Dampers
Factory-built, zero-clearance fireplaces will require the
damper to be removed in order to install the vent liners.
These dampers are usually bolted into place. Dampers
in masonry fireplaces must be fixed open and may
remain in place.
Ash Retaining Curbs
Some fi replaces (particularly factory-built) have a raised
curb at the front edge to retain ashes. Check the dimen-
sions carefully to ensure the 738 engine will fi t behind
any raised curb (some curbs may be removed separate-
ly from the refractory base).
Gas Line Routing
Plan the routing of the gas line before proceeding.
Utilize the existing hole for the gas line of the factory-
built fireplace.
If the fireplace has no access hole, carefully drill an
access hole of 1.5 inch (38 mm) or less through the
lower sides or bottom of the firebox. The access hole
must be plugged with non-combustible insulation after
the gas supply line has been installed.
See Dimensions section for detailed location of gas inlet.
Also, take into consideration whether or not a fan or
shut-off valve will interfere when planning routing of the
gas line.
Existing Glass Doors and Wire Screens
Existing glass doors must be permanently removed
prior to installing the 738 insert.
Combustible Mantels
Combustible mantel clearances must conform to those
required for the original solid-fuel fireplace into which
the 738 is being installed.
Attach Warning Conversion Plate to Existing
Fireplace
(plate supplied loose with 738 heater)
Attach the “This fireplace has been converted...” label to
the existing fireplace using screws or other mechanical
means and store any removed parts in back of the
existing fireplace for future use.
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