Owner`s manual
10
Pack Contents
Optional Frets (sold separately)
Choice of cast iron frets available separately. Simply slide into place on fret retainers supplied with engine.
555CFK Circulating Fan Kit (sold separately)
Thermally actuated fan (blower), mounting plate, and variable speed control complete with 6’–0” grounded cord 
set. Complete instructions packaged with kit.
Conversion Kits (sold separately)
RA24NK to convert from LPG to Natural Gas.
RA24PK to convert from Natural Gas to LPG.
Kits include main burner orifi ce, pilot burner orifi ce, instructions, special screwdriver to access regulator.
Note: A manometer is required to reset pressure regulator on valve.
Existing Fireplace Preparation
A few points must be considered before inserting the RF24 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 RF24 engine. Cutting away any sheet metal parts of the existing fi replace to accommodate 
the installation of the RF24 is prohibited. Check with local authorities if in doubt.
Clean Fireplace and Chimney
Have the chimney swept and the fi replace cavity cleaned before installing the RF24 heater and vent liners. Any 
creosote or soot residue remaining in the fi replace cavity or chimney may cause odors once the RF24 insert is 
installed. Consult with chimney sweep for information on how best to clean.
Existing Dampers
Factory-built, zero-clearance fi replaces will require the damper to be removed in order to install the vent liners. 
These dampers are usually bolted into place. Dampers in masonry fi replaces must be fi xed 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 dimensions 
carefully to ensure the RF24 engine will fi t behind any raised curb (some curbs may be removed separately from 
the refractory base). The fret retainers allow for some vertical adjustment of the cast iron fret should the fret need 
to sit on top of the curb, otherwise the fret will need to be eliminated or adequate room provided behind the curb.
Gas Line Routing
Plan the routing of the gas line before proceeding. Utilize the existing hole for the gas line. If the factory-built 
fi replace 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 fi rebox. The access hole must be plugged with non-combustible insulation after the gas supply line 
has been installed. See General Dimension drawing 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.
24-1/2”
8”
RA24TB Fret (Black)
27”
10”
RA24CV Fret (Vintage Iron)
25-1/2”
11”
RA24AV Fret (Vintage Iron)










