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Coal Burning
Do not burn coal on the wood grate. An optional coal grate kit
is available for the Oval (#1500) and the SweetHeart (#4500)
to burn coal. An installation and operating manual is packed
with every Oval and Sweetheart Coal Kit. Extra copies may
be obtained from your dealer or by contacting AGA Marvel.
Below is a brief description of the coal kit installation
Sweetheart Coal Grate Installation
To install the optional coal grates, remove the lift handle, the
key plate and lids. Lift the wood grate out through the top of
the rebox and replace it with the coal grate. Remove small
front brick in rebox by unscrewing bolt & nut that holds brick
in place. (Please note that older models require front re brick
to be installed with the groove facing away from the rebox
and towards the front of the stove). Replace with large brick
in coal kit. Gently tap the coal grate down until it ts snugly
into the steel track. Replace the key plate, lift handle and lids.
Then proceed with redoor damper installation.
Oval Coal Grate Installation
To install the optional coal grate package, remove the wood
grate through the ash pan door and replace with the coal
grate. Remove the key plate over the rebox and slide the coal
liners #1470 in the front and #1475 in the back of the rebox.
Replace the key plate, lift handle and lids. Then proceed with
redoor damper installation.
Oval and Sweetheart Firedoor Damper
(Coal burning only, see illustration on next column)
The redoor damper comes with each coal kit and must be
installed. Remove the nickel redoor frame from the redoor.
Loosen the three screws that hold the cover plate over the
damper holes. Replace the cover plate with the coal damper,
lettered side out. Tighten screws just enough to hold the damper
plate on but also allow it to slide freely back and forth. Lock
screws in position with a nut on each screw thread.
A wood “break in” re should be done before attempting
to burn coal (see page 16).
C
O
Illustration showing
Oval redoor
damper installation
Starting Up a Coal Fire
A chimney 6” (15.25 cm) in diameter is imperative for the
Coal Burning process. On chimney larger than 6” (15.25
cm) in diameter will cause poor ignition of the coal due to
inadequate draft.
It is possible to burn coal with a large diameter chimney, but
banking a new bed of coals will require a greater mix of wood
to create and maintain an adequate draft.
The minimum draft required to maintain an oven temperature
of 350 ºF (175⁰C) is around .04” (1.016 mm) on a water
column. For drafts under .04” (1.016 mm) on a water column,
closing the oven draft damper more than half way, will cause
back pufng.
During the recharge phase of a new bank, a draft of .08” (2.03
mm) should be maintained for at least 10-15 minutes or until
a substantial bed of red embers is built up.
We recommend burning anthracite coal, which is relatively
clean to handle, burns evenly with a low ame, has a low
sulphur content and produces relatively little smoke.
Use a “chess nut” or “nut” size of coal, which is 1 3/16 to 1
5/8 in (3 cm to 4.13 cm) diameter. However, other coal, such
as bituminous, can be burned, but is inferior to anthracite.